6796 lines
272 KiB
C++
6796 lines
272 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2020 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @brief This is the ValueFlow component in Cppcheck.
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*
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* Each @sa Token in the token list has a list of values. These are
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* the "possible" values for the Token at runtime.
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*
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* In the --debug and --debug-normal output you can see the ValueFlow data. For example:
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*
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* int f()
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* {
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* int x = 10;
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* return 4 * x + 2;
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* }
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*
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* The --debug-normal output says:
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*
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* ##Value flow
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* Line 3
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* 10 always 10
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* Line 4
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* 4 always 4
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* * always 40
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* x always 10
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* + always 42
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* 2 always 2
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*
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* All value flow analysis is executed in the ValueFlow::setValues() function. The ValueFlow analysis is executed after
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* the tokenizer/ast/symboldatabase/etc.. The ValueFlow analysis is done in a series of valueFlow* function calls, where
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* each such function call can only use results from previous function calls. The function calls should be arranged so
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* that valueFlow* that do not require previous ValueFlow information should be first.
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*
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* Type of analysis
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* ================
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*
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* This is "flow sensitive" value flow analysis. We _usually_ track the value for 1 variable at a time.
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*
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* How are calculations handled
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* ============================
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*
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* Here is an example code:
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*
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* x = 3 + 4;
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*
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* The valueFlowNumber set the values for the "3" and "4" tokens by calling setTokenValue().
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* The setTokenValue() handle the calculations automatically. When both "3" and "4" have values, the "+" can be
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* calculated. setTokenValue() recursively calls itself when parents in calculations can be calculated.
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*
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* Forward / Reverse flow analysis
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* ===============================
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*
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* In forward value flow analysis we know a value and see what happens when we are stepping the program forward. Like
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* normal execution. The valueFlowForwardVariable is used in this analysis.
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*
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* In reverse value flow analysis we know the value of a variable at line X. And try to "execute backwards" to determine
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* possible values before line X. The valueFlowReverse is used in this analysis.
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*
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*
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*/
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#include "valueflow.h"
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#include "analyzer.h"
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#include "astutils.h"
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#include "errorlogger.h"
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#include "errortypes.h"
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#include "forwardanalyzer.h"
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#include "library.h"
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#include "mathlib.h"
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#include "path.h"
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#include "platform.h"
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#include "programmemory.h"
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#include "reverseanalyzer.h"
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#include "settings.h"
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#include "standards.h"
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#include "symboldatabase.h"
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#include "token.h"
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#include "tokenlist.h"
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#include "utils.h"
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#include "valueptr.h"
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#include <algorithm>
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#include <cassert>
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#include <cstddef>
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#include <cstdint>
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#include <cstring>
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#include <functional>
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#include <iterator>
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#include <limits>
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#include <map>
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#include <set>
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#include <stack>
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#include <stdexcept>
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#include <string>
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#include <tuple>
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#include <vector>
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static void bailoutInternal(const std::string& type, TokenList *tokenlist, ErrorLogger *errorLogger, const Token *tok, const std::string &what, const std::string &file, int line, std::string function)
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{
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if (function.find("operator") != std::string::npos)
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function = "(valueFlow)";
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std::list<ErrorMessage::FileLocation> callstack(1, ErrorMessage::FileLocation(tok, tokenlist));
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ErrorMessage errmsg(callstack, tokenlist->getSourceFilePath(), Severity::debug,
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Path::stripDirectoryPart(file) + ":" + MathLib::toString(line) + ":" + function + " bailout: " + what, type, false);
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errorLogger->reportErr(errmsg);
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}
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#if (defined __cplusplus) && __cplusplus >= 201103L
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#define bailout2(type, tokenlist, errorLogger, tok, what) bailoutInternal(type, tokenlist, errorLogger, tok, what, __FILE__, __LINE__, __func__)
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#elif (defined __GNUC__) || (defined __clang__) || (defined _MSC_VER)
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#define bailout2(type, tokenlist, errorLogger, tok, what) bailoutInternal(type, tokenlist, errorLogger, tok, what, __FILE__, __LINE__, __FUNCTION__)
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#else
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#define bailout2(type, tokenlist, errorLogger, tok, what) bailoutInternal(type, tokenlist, errorLogger, tok, what, __FILE__, __LINE__, "(valueFlow)")
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#endif
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#define bailout(tokenlist, errorLogger, tok, what) bailout2("valueFlowBailout", tokenlist, errorLogger, tok, what)
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#define bailoutIncompleteVar(tokenlist, errorLogger, tok, what) bailout2("valueFlowBailoutIncompleteVar", tokenlist, errorLogger, tok, what)
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static void changeKnownToPossible(std::list<ValueFlow::Value> &values, int indirect=-1)
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{
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for (ValueFlow::Value& v: values) {
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if (indirect >= 0 && v.indirect != indirect)
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continue;
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v.changeKnownToPossible();
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}
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}
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static void removeImpossible(std::list<ValueFlow::Value>& values, int indirect = -1)
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{
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values.remove_if([&](const ValueFlow::Value& v) {
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if (indirect >= 0 && v.indirect != indirect)
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return false;
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return v.isImpossible();
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});
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}
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static void lowerToPossible(std::list<ValueFlow::Value>& values, int indirect = -1)
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{
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changeKnownToPossible(values, indirect);
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removeImpossible(values, indirect);
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}
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static void changePossibleToKnown(std::list<ValueFlow::Value>& values, int indirect = -1)
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{
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for (ValueFlow::Value& v : values) {
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if (indirect >= 0 && v.indirect != indirect)
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continue;
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if (!v.isPossible())
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continue;
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if (v.bound != ValueFlow::Value::Bound::Point)
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continue;
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v.setKnown();
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}
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}
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static void setValueUpperBound(ValueFlow::Value& value, bool upper)
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{
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if (upper)
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value.bound = ValueFlow::Value::Bound::Upper;
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else
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value.bound = ValueFlow::Value::Bound::Lower;
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}
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static void setValueBound(ValueFlow::Value& value, const Token* tok, bool invert)
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{
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if (Token::Match(tok, "<|<=")) {
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setValueUpperBound(value, !invert);
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} else if (Token::Match(tok, ">|>=")) {
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setValueUpperBound(value, invert);
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}
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}
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static void setConditionalValues(const Token *tok,
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bool invert,
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MathLib::bigint value,
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ValueFlow::Value &true_value,
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ValueFlow::Value &false_value)
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{
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if (Token::Match(tok, "==|!=|>=|<=")) {
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true_value = ValueFlow::Value{tok, value};
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const char* greaterThan = ">=";
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const char* lessThan = "<=";
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if (invert)
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std::swap(greaterThan, lessThan);
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if (Token::simpleMatch(tok, greaterThan, strlen(greaterThan))) {
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false_value = ValueFlow::Value{tok, value - 1};
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} else if (Token::simpleMatch(tok, lessThan, strlen(lessThan))) {
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false_value = ValueFlow::Value{tok, value + 1};
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} else {
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false_value = ValueFlow::Value{tok, value};
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}
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} else {
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const char* greaterThan = ">";
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const char* lessThan = "<";
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if (invert)
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std::swap(greaterThan, lessThan);
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if (Token::simpleMatch(tok, greaterThan, strlen(greaterThan))) {
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true_value = ValueFlow::Value{tok, value + 1};
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false_value = ValueFlow::Value{tok, value};
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} else if (Token::simpleMatch(tok, lessThan, strlen(lessThan))) {
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true_value = ValueFlow::Value{tok, value - 1};
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false_value = ValueFlow::Value{tok, value};
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}
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}
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setValueBound(true_value, tok, invert);
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setValueBound(false_value, tok, !invert);
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}
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static bool isSaturated(MathLib::bigint value)
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{
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return value == std::numeric_limits<MathLib::bigint>::max() || value == std::numeric_limits<MathLib::bigint>::min();
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}
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const Token *parseCompareInt(const Token *tok, ValueFlow::Value &true_value, ValueFlow::Value &false_value, const std::function<std::vector<MathLib::bigint>(const Token*)>& evaluate)
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{
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if (!tok->astOperand1() || !tok->astOperand2())
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return nullptr;
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if (tok->isComparisonOp()) {
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std::vector<MathLib::bigint> value1 = evaluate(tok->astOperand1());
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std::vector<MathLib::bigint> value2 = evaluate(tok->astOperand2());
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if (!value1.empty()) {
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if (isSaturated(value1.front()))
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return nullptr;
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setConditionalValues(tok, true, value1.front(), true_value, false_value);
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return tok->astOperand2();
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} else if (!value2.empty()) {
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if (isSaturated(value2.front()))
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return nullptr;
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setConditionalValues(tok, false, value2.front(), true_value, false_value);
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return tok->astOperand1();
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}
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}
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return nullptr;
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}
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const Token *parseCompareInt(const Token *tok, ValueFlow::Value &true_value, ValueFlow::Value &false_value)
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{
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return parseCompareInt(tok, true_value, false_value, [](const Token* t) -> std::vector<MathLib::bigint> {
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if (t->hasKnownIntValue())
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return {t->values().front().intvalue};
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return std::vector<MathLib::bigint>{};
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});
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}
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static bool isEscapeScope(const Token* tok, TokenList * tokenlist, bool unknown = false)
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{
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if (!Token::simpleMatch(tok, "{"))
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return false;
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// TODO this search for termTok in all subscopes. It should check the end of the scope.
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const Token * termTok = Token::findmatch(tok, "return|continue|break|throw|goto", tok->link());
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if (termTok && termTok->scope() == tok->scope())
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return true;
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std::string unknownFunction;
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if (tokenlist && tokenlist->getSettings()->library.isScopeNoReturn(tok->link(), &unknownFunction))
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return unknownFunction.empty() || unknown;
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return false;
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}
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static ValueFlow::Value castValue(ValueFlow::Value value, const ValueType::Sign sign, nonneg int bit)
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{
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if (value.isFloatValue()) {
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value.valueType = ValueFlow::Value::ValueType::INT;
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if (value.floatValue >= std::numeric_limits<int>::min() && value.floatValue <= std::numeric_limits<int>::max()) {
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value.intvalue = value.floatValue;
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} else { // don't perform UB
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value.intvalue = 0;
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}
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}
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if (bit < MathLib::bigint_bits) {
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const MathLib::biguint one = 1;
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value.intvalue &= (one << bit) - 1;
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if (sign == ValueType::Sign::SIGNED && value.intvalue & (one << (bit - 1))) {
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value.intvalue |= ~((one << bit) - 1ULL);
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}
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}
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return value;
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}
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static void combineValueProperties(const ValueFlow::Value &value1, const ValueFlow::Value &value2, ValueFlow::Value *result)
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{
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if (value1.isKnown() && value2.isKnown())
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result->setKnown();
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else if (value1.isImpossible() || value2.isImpossible())
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result->setImpossible();
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else if (value1.isInconclusive() || value2.isInconclusive())
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result->setInconclusive();
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else
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result->setPossible();
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if (value1.isIteratorValue())
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result->valueType = value1.valueType;
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if (value2.isIteratorValue())
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result->valueType = value2.valueType;
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result->condition = value1.condition ? value1.condition : value2.condition;
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result->varId = (value1.varId != 0) ? value1.varId : value2.varId;
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result->varvalue = (result->varId == value1.varId) ? value1.varvalue : value2.varvalue;
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result->errorPath = (value1.errorPath.empty() ? value2 : value1).errorPath;
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result->safe = value1.safe || value2.safe;
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if (value1.bound == ValueFlow::Value::Bound::Point || value2.bound == ValueFlow::Value::Bound::Point) {
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if (value1.bound == ValueFlow::Value::Bound::Upper || value2.bound == ValueFlow::Value::Bound::Upper)
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result->bound = ValueFlow::Value::Bound::Upper;
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if (value1.bound == ValueFlow::Value::Bound::Lower || value2.bound == ValueFlow::Value::Bound::Lower)
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result->bound = ValueFlow::Value::Bound::Lower;
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}
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if (value1.path != value2.path)
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result->path = -1;
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else
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result->path = value1.path;
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}
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static const Token *getCastTypeStartToken(const Token *parent)
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{
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// TODO: This might be a generic utility function?
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if (!parent || parent->str() != "(")
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return nullptr;
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if (!parent->astOperand2() && Token::Match(parent,"( %name%"))
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return parent->next();
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if (parent->astOperand2() && Token::Match(parent->astOperand1(), "const_cast|dynamic_cast|reinterpret_cast|static_cast <"))
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return parent->astOperand1()->tokAt(2);
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return nullptr;
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}
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static bool isComputableValue(const Token* parent, const ValueFlow::Value& value)
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{
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const bool noninvertible = parent->isComparisonOp() || Token::Match(parent, "%|/|&|%or%");
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if (noninvertible && value.isImpossible())
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return false;
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if (!value.isIntValue() && !value.isFloatValue() && !value.isTokValue() && !value.isIteratorValue())
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return false;
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if (value.isIteratorValue() && !Token::Match(parent, "+|-"))
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return false;
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if (value.isTokValue() && (!parent->isComparisonOp() || value.tokvalue->tokType() != Token::eString))
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return false;
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return true;
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}
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template<class T>
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static bool isEqual(T x, T y)
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{
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return x == y;
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}
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template<>
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bool isEqual<double>(double x, double y)
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{
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const double diff = (x > y) ? x - y : y - x;
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return !((diff / 2) < diff);
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}
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template<class T>
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static bool isZero(T x)
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{
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return isEqual<T>(x, T(0));
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}
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template <class T>
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static T calculate(const std::string& s, T x, T y)
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{
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switch (MathLib::encodeMultiChar(s)) {
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case '+':
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return x + y;
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case '-':
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return x - y;
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case '*':
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return x * y;
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case '/':
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return x / y;
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case '%':
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return MathLib::bigint(x) % MathLib::bigint(y);
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case '&':
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return MathLib::bigint(x) & MathLib::bigint(y);
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case '|':
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return MathLib::bigint(x) | MathLib::bigint(y);
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case '^':
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return MathLib::bigint(x) ^ MathLib::bigint(y);
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case '>':
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return x > y;
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case '<':
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return x < y;
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case '<<':
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return MathLib::bigint(x) << MathLib::bigint(y);
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case '>>':
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return MathLib::bigint(x) >> MathLib::bigint(y);
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case '&&':
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return !isZero(x) && !isZero(y);
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case '||':
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return !isZero(x) || !isZero(y);
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case '==':
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return isEqual(x, y);
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case '!=':
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return !isEqual(x, y);
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case '>=':
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return x >= y;
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case '<=':
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return x <= y;
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}
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throw InternalError(nullptr, "Unknown operator: " + s);
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}
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/** Set token value for cast */
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static void setTokenValueCast(Token *parent, const ValueType &valueType, const ValueFlow::Value &value, const Settings *settings);
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/** set ValueFlow value and perform calculations if possible */
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static void setTokenValue(Token* tok, const ValueFlow::Value &value, const Settings *settings)
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{
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if (!tok->addValue(value))
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return;
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if (value.path < 0)
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return;
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Token *parent = tok->astParent();
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if (!parent)
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return;
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if (Token::simpleMatch(parent, "=") && astIsRHS(tok) && !value.isLifetimeValue()) {
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setTokenValue(parent, value, settings);
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return;
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}
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if (value.isContainerSizeValue()) {
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// .empty, .size, +"abc", +'a'
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if (Token::Match(parent, "+|==|!=") && parent->astOperand1() && parent->astOperand2()) {
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for (const ValueFlow::Value &value1 : parent->astOperand1()->values()) {
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if (value1.isImpossible())
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continue;
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for (const ValueFlow::Value &value2 : parent->astOperand2()->values()) {
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if (value2.isImpossible())
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continue;
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if (value1.path != value2.path)
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continue;
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ValueFlow::Value result;
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if (Token::Match(parent, "%comp%"))
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result.valueType = ValueFlow::Value::ValueType::INT;
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else
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result.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
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if (value1.isContainerSizeValue() && value2.isContainerSizeValue())
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result.intvalue = calculate(parent->str(), value1.intvalue, value2.intvalue);
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else if (value1.isContainerSizeValue() && value2.isTokValue() && value2.tokvalue->tokType() == Token::eString)
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result.intvalue = calculate(parent->str(), value1.intvalue, MathLib::bigint(Token::getStrLength(value2.tokvalue)));
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else if (value2.isContainerSizeValue() && value1.isTokValue() && value1.tokvalue->tokType() == Token::eString)
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result.intvalue = calculate(parent->str(), MathLib::bigint(Token::getStrLength(value1.tokvalue)), value2.intvalue);
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else
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continue;
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combineValueProperties(value1, value2, &result);
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if (Token::simpleMatch(parent, "==") && result.intvalue)
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continue;
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if (Token::simpleMatch(parent, "!=") && !result.intvalue)
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continue;
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setTokenValue(parent, result, settings);
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}
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}
|
|
}
|
|
|
|
else if (Token::Match(parent, ". %name% (") && parent->astParent() == parent->tokAt(2) &&
|
|
parent->astOperand1() && parent->astOperand1()->valueType()) {
|
|
const Library::Container *c = parent->astOperand1()->valueType()->container;
|
|
const Library::Container::Yield yields = c ? c->getYield(parent->strAt(1)) : Library::Container::Yield::NO_YIELD;
|
|
if (yields == Library::Container::Yield::SIZE) {
|
|
ValueFlow::Value v(value);
|
|
v.valueType = ValueFlow::Value::ValueType::INT;
|
|
setTokenValue(parent->astParent(), v, settings);
|
|
} else if (yields == Library::Container::Yield::EMPTY) {
|
|
ValueFlow::Value v(value);
|
|
v.intvalue = !v.intvalue;
|
|
v.valueType = ValueFlow::Value::ValueType::INT;
|
|
setTokenValue(parent->astParent(), v, settings);
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
if (value.isLifetimeValue()) {
|
|
if (!isLifetimeBorrowed(parent, settings))
|
|
return;
|
|
if (value.lifetimeKind == ValueFlow::Value::LifetimeKind::Iterator && astIsIterator(parent)) {
|
|
setTokenValue(parent,value,settings);
|
|
} else if (astIsPointer(tok) && astIsPointer(parent) &&
|
|
(parent->isArithmeticalOp() || Token::Match(parent, "( %type%"))) {
|
|
setTokenValue(parent,value,settings);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (value.isUninitValue()) {
|
|
ValueFlow::Value pvalue = value;
|
|
if (parent->isUnaryOp("&")) {
|
|
pvalue.indirect++;
|
|
setTokenValue(parent, pvalue, settings);
|
|
} else if (Token::Match(parent, ". %var%") && parent->astOperand1() == tok) {
|
|
if (parent->originalName() == "->" && pvalue.indirect > 0)
|
|
pvalue.indirect--;
|
|
setTokenValue(parent->astOperand2(), pvalue, settings);
|
|
} else if (Token::Match(parent->astParent(), ". %var%") && parent->astParent()->astOperand1() == parent) {
|
|
if (parent->astParent()->originalName() == "->" && pvalue.indirect > 0)
|
|
pvalue.indirect--;
|
|
setTokenValue(parent->astParent()->astOperand2(), pvalue, settings);
|
|
} else if (parent->isUnaryOp("*") && pvalue.indirect > 0) {
|
|
pvalue.indirect--;
|
|
setTokenValue(parent, pvalue, settings);
|
|
}
|
|
return;
|
|
}
|
|
|
|
// cast..
|
|
if (const Token *castType = getCastTypeStartToken(parent)) {
|
|
if (((tok->valueType() == nullptr && value.isImpossible()) || astIsPointer(tok)) && value.valueType == ValueFlow::Value::ValueType::INT &&
|
|
Token::simpleMatch(parent->astOperand1(), "dynamic_cast"))
|
|
return;
|
|
const ValueType &valueType = ValueType::parseDecl(castType, settings);
|
|
setTokenValueCast(parent, valueType, value, settings);
|
|
}
|
|
|
|
else if (parent->str() == ":") {
|
|
setTokenValue(parent,value,settings);
|
|
}
|
|
|
|
else if (parent->str() == "?" && tok->str() == ":" && tok == parent->astOperand2() && parent->astOperand1()) {
|
|
// is condition always true/false?
|
|
if (parent->astOperand1()->hasKnownValue()) {
|
|
const ValueFlow::Value &condvalue = parent->astOperand1()->values().front();
|
|
const bool cond(condvalue.isTokValue() || (condvalue.isIntValue() && condvalue.intvalue != 0));
|
|
if (cond && !tok->astOperand1()) { // true condition, no second operator
|
|
setTokenValue(parent, condvalue, settings);
|
|
} else {
|
|
const Token *op = cond ? tok->astOperand1() : tok->astOperand2();
|
|
if (!op) // #7769 segmentation fault at setTokenValue()
|
|
return;
|
|
const std::list<ValueFlow::Value> &values = op->values();
|
|
if (std::find(values.begin(), values.end(), value) != values.end())
|
|
setTokenValue(parent, value, settings);
|
|
}
|
|
} else {
|
|
// is condition only depending on 1 variable?
|
|
nonneg int varId = 0;
|
|
bool ret = false;
|
|
visitAstNodes(parent->astOperand1(),
|
|
[&](const Token *t) {
|
|
if (t->varId()) {
|
|
if (varId > 0 || value.varId != 0)
|
|
ret = true;
|
|
varId = t->varId();
|
|
} else if (t->str() == "(" && Token::Match(t->previous(), "%name%"))
|
|
ret = true; // function call
|
|
return ret ? ChildrenToVisit::done : ChildrenToVisit::op1_and_op2;
|
|
});
|
|
if (ret)
|
|
return;
|
|
|
|
ValueFlow::Value v(value);
|
|
v.conditional = true;
|
|
v.changeKnownToPossible();
|
|
|
|
if (varId)
|
|
v.varId = varId;
|
|
|
|
setTokenValue(parent, v, settings);
|
|
}
|
|
}
|
|
|
|
else if (parent->str() == "?" && value.isIntValue() && tok == parent->astOperand1() && value.isKnown() &&
|
|
parent->astOperand2() && parent->astOperand2()->astOperand1() && parent->astOperand2()->astOperand2()) {
|
|
const std::list<ValueFlow::Value> &values = (value.intvalue == 0
|
|
? parent->astOperand2()->astOperand2()->values()
|
|
: parent->astOperand2()->astOperand1()->values());
|
|
|
|
for (const ValueFlow::Value &v : values)
|
|
setTokenValue(parent, v, settings);
|
|
}
|
|
|
|
// Calculations..
|
|
else if ((parent->isArithmeticalOp() || parent->isComparisonOp() || (parent->tokType() == Token::eBitOp) || (parent->tokType() == Token::eLogicalOp)) &&
|
|
parent->astOperand1() &&
|
|
parent->astOperand2()) {
|
|
|
|
const bool noninvertible = parent->isComparisonOp() || Token::Match(parent, "%|/|&|%or%");
|
|
|
|
// Skip operators with impossible values that are not invertible
|
|
if (noninvertible && value.isImpossible())
|
|
return;
|
|
|
|
// known result when a operand is 0.
|
|
if (Token::Match(parent, "[&*]") && value.isKnown() && value.isIntValue() && value.intvalue==0) {
|
|
setTokenValue(parent, value, settings);
|
|
return;
|
|
}
|
|
|
|
// known result when a operand is true.
|
|
if (Token::simpleMatch(parent, "&&") && value.isKnown() && value.isIntValue() && value.intvalue==0) {
|
|
setTokenValue(parent, value, settings);
|
|
return;
|
|
}
|
|
|
|
// known result when a operand is false.
|
|
if (Token::simpleMatch(parent, "||") && value.isKnown() && value.isIntValue() && value.intvalue!=0) {
|
|
setTokenValue(parent, value, settings);
|
|
return;
|
|
}
|
|
|
|
for (const ValueFlow::Value &value1 : parent->astOperand1()->values()) {
|
|
if (!isComputableValue(parent, value1))
|
|
continue;
|
|
for (const ValueFlow::Value &value2 : parent->astOperand2()->values()) {
|
|
if (value1.path != value2.path)
|
|
continue;
|
|
if (!isComputableValue(parent, value2))
|
|
continue;
|
|
if (value1.isIteratorValue() && value2.isIteratorValue())
|
|
continue;
|
|
if (value1.isKnown() || value2.isKnown() || value1.varId == 0 || value2.varId == 0 ||
|
|
(value1.varId == value2.varId && value1.varvalue == value2.varvalue && value1.isIntValue() &&
|
|
value2.isIntValue())) {
|
|
ValueFlow::Value result(0);
|
|
combineValueProperties(value1, value2, &result);
|
|
const double floatValue1 = value1.isIntValue() ? value1.intvalue : value1.floatValue;
|
|
const double floatValue2 = value2.isIntValue() ? value2.intvalue : value2.floatValue;
|
|
const bool isFloat = value1.isFloatValue() || value2.isFloatValue();
|
|
if (isFloat && Token::Match(parent, "&|^|%|<<|>>|%or%"))
|
|
continue;
|
|
if (Token::Match(parent, "<<|>>") &&
|
|
!(value1.intvalue >= 0 && value2.intvalue >= 0 && value2.intvalue < MathLib::bigint_bits))
|
|
continue;
|
|
if (Token::Match(parent, "/|%") && isZero<double>(floatValue2))
|
|
continue;
|
|
if (Token::Match(parent, "==|!=")) {
|
|
if ((value1.isIntValue() && value2.isTokValue()) || (value1.isTokValue() && value2.isIntValue())) {
|
|
if (parent->str() == "==")
|
|
result.intvalue = 0;
|
|
else if (parent->str() == "!=")
|
|
result.intvalue = 1;
|
|
} else if (value1.isIntValue() && value2.isIntValue()) {
|
|
result.intvalue = calculate(parent->str(), value1.intvalue, value2.intvalue);
|
|
} else {
|
|
continue;
|
|
}
|
|
setTokenValue(parent, result, settings);
|
|
} else if (Token::Match(parent, "%comp%")) {
|
|
if (!isFloat && !value1.isIntValue() && !value2.isIntValue())
|
|
continue;
|
|
if (isFloat)
|
|
result.intvalue = calculate(parent->str(), floatValue1, floatValue2);
|
|
else
|
|
result.intvalue = calculate(parent->str(), value1.intvalue, value2.intvalue);
|
|
setTokenValue(parent, result, settings);
|
|
} else if (Token::Match(parent, "%op%")) {
|
|
if (value1.isTokValue() || value2.isTokValue())
|
|
break;
|
|
if (isFloat) {
|
|
result.valueType = ValueFlow::Value::ValueType::FLOAT;
|
|
result.floatValue = calculate(parent->str(), floatValue1, floatValue2);
|
|
} else {
|
|
result.intvalue = calculate(parent->str(), value1.intvalue, value2.intvalue);
|
|
}
|
|
// If the bound comes from the second value then invert the bound when subtracting
|
|
if (Token::simpleMatch(parent, "-") && value2.bound == result.bound &&
|
|
value2.bound != ValueFlow::Value::Bound::Point)
|
|
result.invertBound();
|
|
setTokenValue(parent, result, settings);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// !
|
|
else if (parent->str() == "!") {
|
|
for (const ValueFlow::Value &val : tok->values()) {
|
|
if (!val.isIntValue())
|
|
continue;
|
|
ValueFlow::Value v(val);
|
|
v.intvalue = !v.intvalue;
|
|
setTokenValue(parent, v, settings);
|
|
}
|
|
}
|
|
|
|
// ~
|
|
else if (parent->str() == "~") {
|
|
for (const ValueFlow::Value &val : tok->values()) {
|
|
if (!val.isIntValue())
|
|
continue;
|
|
ValueFlow::Value v(val);
|
|
v.intvalue = ~v.intvalue;
|
|
int bits = 0;
|
|
if (settings &&
|
|
tok->valueType() &&
|
|
tok->valueType()->sign == ValueType::Sign::UNSIGNED &&
|
|
tok->valueType()->pointer == 0) {
|
|
if (tok->valueType()->type == ValueType::Type::INT)
|
|
bits = settings->int_bit;
|
|
else if (tok->valueType()->type == ValueType::Type::LONG)
|
|
bits = settings->long_bit;
|
|
}
|
|
if (bits > 0 && bits < MathLib::bigint_bits)
|
|
v.intvalue &= (((MathLib::biguint)1)<<bits) - 1;
|
|
setTokenValue(parent, v, settings);
|
|
}
|
|
}
|
|
|
|
// unary minus
|
|
else if (parent->isUnaryOp("-")) {
|
|
for (const ValueFlow::Value &val : tok->values()) {
|
|
if (!val.isIntValue() && !val.isFloatValue())
|
|
continue;
|
|
ValueFlow::Value v(val);
|
|
if (v.isIntValue()) {
|
|
if (v.intvalue == LLONG_MIN)
|
|
// Value can't be inverted
|
|
continue;
|
|
v.intvalue = -v.intvalue;
|
|
} else
|
|
v.floatValue = -v.floatValue;
|
|
v.invertBound();
|
|
setTokenValue(parent, v, settings);
|
|
}
|
|
}
|
|
|
|
// increment
|
|
else if (parent->str() == "++") {
|
|
for (const ValueFlow::Value &val : tok->values()) {
|
|
if (!val.isIntValue() && !val.isFloatValue())
|
|
continue;
|
|
ValueFlow::Value v(val);
|
|
if (parent == tok->previous()) {
|
|
if (v.isIntValue())
|
|
v.intvalue = v.intvalue + 1;
|
|
else
|
|
v.floatValue = v.floatValue + 1.0;
|
|
}
|
|
setTokenValue(parent, v, settings);
|
|
}
|
|
}
|
|
|
|
// decrement
|
|
else if (parent->str() == "--") {
|
|
for (const ValueFlow::Value &val : tok->values()) {
|
|
if (!val.isIntValue() && !val.isFloatValue())
|
|
continue;
|
|
ValueFlow::Value v(val);
|
|
if (parent == tok->previous()) {
|
|
if (v.isIntValue())
|
|
v.intvalue = v.intvalue - 1;
|
|
else
|
|
v.floatValue = v.floatValue - 1.0;
|
|
}
|
|
setTokenValue(parent, v, settings);
|
|
}
|
|
}
|
|
|
|
// Array element
|
|
else if (parent->str() == "[" && parent->isBinaryOp()) {
|
|
for (const ValueFlow::Value &value1 : parent->astOperand1()->values()) {
|
|
if (!value1.isTokValue())
|
|
continue;
|
|
for (const ValueFlow::Value &value2 : parent->astOperand2()->values()) {
|
|
if (!value2.isIntValue())
|
|
continue;
|
|
if (value1.varId == 0 || value2.varId == 0 ||
|
|
(value1.varId == value2.varId && value1.varvalue == value2.varvalue)) {
|
|
ValueFlow::Value result(0);
|
|
result.condition = value1.condition ? value1.condition : value2.condition;
|
|
result.setInconclusive(value1.isInconclusive() | value2.isInconclusive());
|
|
result.varId = (value1.varId != 0) ? value1.varId : value2.varId;
|
|
result.varvalue = (result.varId == value1.varId) ? value1.intvalue : value2.intvalue;
|
|
if (value1.valueKind == value2.valueKind)
|
|
result.valueKind = value1.valueKind;
|
|
if (value1.tokvalue->tokType() == Token::eString) {
|
|
const std::string s = value1.tokvalue->strValue();
|
|
const MathLib::bigint index = value2.intvalue;
|
|
if (index == s.size()) {
|
|
result.intvalue = 0;
|
|
setTokenValue(parent, result, settings);
|
|
} else if (index >= 0 && index < s.size()) {
|
|
result.intvalue = s[index];
|
|
setTokenValue(parent, result, settings);
|
|
}
|
|
} else if (value1.tokvalue->str() == "{") {
|
|
MathLib::bigint index = value2.intvalue;
|
|
const Token *element = value1.tokvalue->next();
|
|
while (index > 0 && element->str() != "}") {
|
|
if (element->str() == ",")
|
|
--index;
|
|
if (Token::Match(element, "[{}()[]]"))
|
|
break;
|
|
element = element->next();
|
|
}
|
|
if (Token::Match(element, "%num% [,}]")) {
|
|
result.intvalue = MathLib::toLongNumber(element->str());
|
|
setTokenValue(parent, result, settings);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
else if (Token::Match(parent, ":: %name%") && parent->astOperand2() == tok) {
|
|
setTokenValue(parent, value, settings);
|
|
}
|
|
}
|
|
|
|
static void setTokenValueCast(Token *parent, const ValueType &valueType, const ValueFlow::Value &value, const Settings *settings)
|
|
{
|
|
if (valueType.pointer)
|
|
setTokenValue(parent,value,settings);
|
|
else if (valueType.type == ValueType::Type::CHAR)
|
|
setTokenValue(parent, castValue(value, valueType.sign, settings->char_bit), settings);
|
|
else if (valueType.type == ValueType::Type::SHORT)
|
|
setTokenValue(parent, castValue(value, valueType.sign, settings->short_bit), settings);
|
|
else if (valueType.type == ValueType::Type::INT)
|
|
setTokenValue(parent, castValue(value, valueType.sign, settings->int_bit), settings);
|
|
else if (valueType.type == ValueType::Type::LONG)
|
|
setTokenValue(parent, castValue(value, valueType.sign, settings->long_bit), settings);
|
|
else if (valueType.type == ValueType::Type::LONGLONG)
|
|
setTokenValue(parent, castValue(value, valueType.sign, settings->long_long_bit), settings);
|
|
else if (value.isIntValue()) {
|
|
const long long charMax = settings->signedCharMax();
|
|
const long long charMin = settings->signedCharMin();
|
|
if (charMin <= value.intvalue && value.intvalue <= charMax) {
|
|
// unknown type, but value is small so there should be no truncation etc
|
|
setTokenValue(parent,value,settings);
|
|
}
|
|
}
|
|
}
|
|
|
|
static nonneg int getSizeOfType(const Token *typeTok, const Settings *settings)
|
|
{
|
|
const ValueType &valueType = ValueType::parseDecl(typeTok, settings);
|
|
if (valueType.pointer > 0)
|
|
return settings->sizeof_pointer;
|
|
if (valueType.type == ValueType::Type::BOOL || valueType.type == ValueType::Type::CHAR)
|
|
return 1;
|
|
if (valueType.type == ValueType::Type::SHORT)
|
|
return settings->sizeof_short;
|
|
if (valueType.type == ValueType::Type::INT)
|
|
return settings->sizeof_int;
|
|
if (valueType.type == ValueType::Type::LONG)
|
|
return settings->sizeof_long;
|
|
if (valueType.type == ValueType::Type::LONGLONG)
|
|
return settings->sizeof_long_long;
|
|
if (valueType.type == ValueType::Type::WCHAR_T)
|
|
return settings->sizeof_wchar_t;
|
|
|
|
return 0;
|
|
}
|
|
|
|
size_t ValueFlow::getSizeOf(const ValueType &vt, const Settings *settings)
|
|
{
|
|
if (vt.pointer)
|
|
return settings->sizeof_pointer;
|
|
if (vt.type == ValueType::Type::CHAR)
|
|
return 1;
|
|
if (vt.type == ValueType::Type::SHORT)
|
|
return settings->sizeof_short;
|
|
if (vt.type == ValueType::Type::WCHAR_T)
|
|
return settings->sizeof_wchar_t;
|
|
if (vt.type == ValueType::Type::INT)
|
|
return settings->sizeof_int;
|
|
if (vt.type == ValueType::Type::LONG)
|
|
return settings->sizeof_long;
|
|
if (vt.type == ValueType::Type::LONGLONG)
|
|
return settings->sizeof_long_long;
|
|
if (vt.type == ValueType::Type::FLOAT)
|
|
return settings->sizeof_float;
|
|
if (vt.type == ValueType::Type::DOUBLE)
|
|
return settings->sizeof_double;
|
|
if (vt.type == ValueType::Type::LONGDOUBLE)
|
|
return settings->sizeof_long_double;
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Handle various constants..
|
|
static Token * valueFlowSetConstantValue(Token *tok, const Settings *settings, bool cpp)
|
|
{
|
|
if ((tok->isNumber() && MathLib::isInt(tok->str())) || (tok->tokType() == Token::eChar)) {
|
|
ValueFlow::Value value(MathLib::toLongNumber(tok->str()));
|
|
if (!tok->isTemplateArg())
|
|
value.setKnown();
|
|
setTokenValue(tok, value, settings);
|
|
} else if (tok->isNumber() && MathLib::isFloat(tok->str())) {
|
|
ValueFlow::Value value;
|
|
value.valueType = ValueFlow::Value::ValueType::FLOAT;
|
|
value.floatValue = MathLib::toDoubleNumber(tok->str());
|
|
if (!tok->isTemplateArg())
|
|
value.setKnown();
|
|
setTokenValue(tok, value, settings);
|
|
} else if (tok->enumerator() && tok->enumerator()->value_known) {
|
|
ValueFlow::Value value(tok->enumerator()->value);
|
|
if (!tok->isTemplateArg())
|
|
value.setKnown();
|
|
setTokenValue(tok, value, settings);
|
|
} else if (tok->str() == "NULL" || (cpp && tok->str() == "nullptr")) {
|
|
ValueFlow::Value value(0);
|
|
if (!tok->isTemplateArg())
|
|
value.setKnown();
|
|
setTokenValue(tok, value, settings);
|
|
} else if (Token::simpleMatch(tok, "sizeof (")) {
|
|
const Token *tok2 = tok->tokAt(2);
|
|
// skip over tokens to find variable or type
|
|
while (Token::Match(tok2, "%name% ::|.|[")) {
|
|
if (tok2->next()->str() == "[")
|
|
tok2 = tok2->linkAt(1)->next();
|
|
else
|
|
tok2 = tok2->tokAt(2);
|
|
}
|
|
if (Token::simpleMatch(tok, "sizeof ( *")) {
|
|
const ValueType *vt = tok->tokAt(2)->valueType();
|
|
const size_t sz = vt ? ValueFlow::getSizeOf(*vt, settings) : 0;
|
|
if (sz > 0) {
|
|
ValueFlow::Value value(sz);
|
|
if (!tok2->isTemplateArg() && settings->platformType != cppcheck::Platform::Unspecified)
|
|
value.setKnown();
|
|
setTokenValue(tok->next(), value, settings);
|
|
}
|
|
} else if (tok2->enumerator() && tok2->enumerator()->scope) {
|
|
long long size = settings->sizeof_int;
|
|
const Token * type = tok2->enumerator()->scope->enumType;
|
|
if (type) {
|
|
size = getSizeOfType(type, settings);
|
|
if (size == 0)
|
|
tok->linkAt(1);
|
|
}
|
|
ValueFlow::Value value(size);
|
|
if (!tok2->isTemplateArg() && settings->platformType != cppcheck::Platform::Unspecified)
|
|
value.setKnown();
|
|
setTokenValue(tok, value, settings);
|
|
setTokenValue(tok->next(), value, settings);
|
|
} else if (tok2->type() && tok2->type()->isEnumType()) {
|
|
long long size = settings->sizeof_int;
|
|
if (tok2->type()->classScope) {
|
|
const Token * type = tok2->type()->classScope->enumType;
|
|
if (type) {
|
|
size = getSizeOfType(type, settings);
|
|
}
|
|
}
|
|
ValueFlow::Value value(size);
|
|
if (!tok2->isTemplateArg() && settings->platformType != cppcheck::Platform::Unspecified)
|
|
value.setKnown();
|
|
setTokenValue(tok, value, settings);
|
|
setTokenValue(tok->next(), value, settings);
|
|
} else if (Token::Match(tok, "sizeof ( %var% ) / sizeof (") && tok->next()->astParent() == tok->tokAt(4)) {
|
|
// Get number of elements in array
|
|
const Token *sz1 = tok->tokAt(2);
|
|
const Token *sz2 = tok->tokAt(7);
|
|
const nonneg int varid1 = sz1->varId();
|
|
if (varid1 &&
|
|
sz1->variable() &&
|
|
sz1->variable()->isArray() &&
|
|
!sz1->variable()->dimensions().empty() &&
|
|
sz1->variable()->dimensionKnown(0) &&
|
|
(Token::Match(sz2, "* %varid% )", varid1) || Token::Match(sz2, "%varid% [ 0 ] )", varid1))) {
|
|
ValueFlow::Value value(sz1->variable()->dimension(0));
|
|
if (!tok2->isTemplateArg() && settings->platformType != cppcheck::Platform::Unspecified)
|
|
value.setKnown();
|
|
setTokenValue(tok->tokAt(4), value, settings);
|
|
}
|
|
} else if (Token::Match(tok2, "%var% )")) {
|
|
const Variable *var = tok2->variable();
|
|
// only look for single token types (no pointers or references yet)
|
|
if (var && var->typeStartToken() == var->typeEndToken()) {
|
|
// find the size of the type
|
|
size_t size = 0;
|
|
if (var->isEnumType()) {
|
|
size = settings->sizeof_int;
|
|
if (var->type()->classScope && var->type()->classScope->enumType)
|
|
size = getSizeOfType(var->type()->classScope->enumType, settings);
|
|
} else if (var->valueType()) {
|
|
size = ValueFlow::getSizeOf(*var->valueType(), settings);
|
|
} else if (!var->type()) {
|
|
size = getSizeOfType(var->typeStartToken(), settings);
|
|
}
|
|
// find the number of elements
|
|
size_t count = 1;
|
|
for (size_t i = 0; i < var->dimensions().size(); ++i) {
|
|
if (var->dimensionKnown(i))
|
|
count *= var->dimension(i);
|
|
else
|
|
count = 0;
|
|
}
|
|
if (size && count > 0) {
|
|
ValueFlow::Value value(count * size);
|
|
if (settings->platformType != cppcheck::Platform::Unspecified)
|
|
value.setKnown();
|
|
setTokenValue(tok, value, settings);
|
|
setTokenValue(tok->next(), value, settings);
|
|
}
|
|
}
|
|
} else if (tok2->tokType() == Token::eString) {
|
|
size_t sz = Token::getStrSize(tok2, settings);
|
|
if (sz > 0) {
|
|
ValueFlow::Value value(sz);
|
|
value.setKnown();
|
|
setTokenValue(const_cast<Token *>(tok->next()), value, settings);
|
|
}
|
|
} else if (tok2->tokType() == Token::eChar) {
|
|
nonneg int sz = 0;
|
|
if (cpp && settings->standards.cpp >= Standards::CPP20 && tok2->isUtf8())
|
|
sz = 1;
|
|
else if (tok2->isUtf16())
|
|
sz = 2;
|
|
else if (tok2->isUtf32())
|
|
sz = 4;
|
|
else if (tok2->isLong())
|
|
sz = settings->sizeof_wchar_t;
|
|
else if ((tok2->isCChar() && !cpp) || (tok2->isCMultiChar()))
|
|
sz = settings->sizeof_int;
|
|
else
|
|
sz = 1;
|
|
|
|
if (sz > 0) {
|
|
ValueFlow::Value value(sz);
|
|
value.setKnown();
|
|
setTokenValue(tok->next(), value, settings);
|
|
}
|
|
} else if (!tok2->type()) {
|
|
const ValueType &vt = ValueType::parseDecl(tok2,settings);
|
|
const size_t sz = ValueFlow::getSizeOf(vt, settings);
|
|
if (sz > 0) {
|
|
ValueFlow::Value value(sz);
|
|
if (!tok2->isTemplateArg() && settings->platformType != cppcheck::Platform::Unspecified)
|
|
value.setKnown();
|
|
setTokenValue(tok->next(), value, settings);
|
|
}
|
|
}
|
|
// skip over enum
|
|
tok = tok->linkAt(1);
|
|
}
|
|
return tok->next();
|
|
}
|
|
|
|
|
|
static void valueFlowNumber(TokenList *tokenlist)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok;) {
|
|
tok = valueFlowSetConstantValue(tok, tokenlist->getSettings(), tokenlist->isCPP());
|
|
}
|
|
|
|
if (tokenlist->isCPP()) {
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (tok->isName() && !tok->varId() && Token::Match(tok, "false|true")) {
|
|
ValueFlow::Value value(tok->str() == "true");
|
|
if (!tok->isTemplateArg())
|
|
value.setKnown();
|
|
setTokenValue(tok, value, tokenlist->getSettings());
|
|
} else if (Token::Match(tok, "[(,] NULL [,)]")) {
|
|
// NULL function parameters are not simplified in the
|
|
// normal tokenlist
|
|
ValueFlow::Value value(0);
|
|
if (!tok->isTemplateArg())
|
|
value.setKnown();
|
|
setTokenValue(tok->next(), value, tokenlist->getSettings());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowString(TokenList *tokenlist)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (tok->tokType() == Token::eString) {
|
|
ValueFlow::Value strvalue;
|
|
strvalue.valueType = ValueFlow::Value::ValueType::TOK;
|
|
strvalue.tokvalue = tok;
|
|
strvalue.setKnown();
|
|
setTokenValue(tok, strvalue, tokenlist->getSettings());
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowArray(TokenList *tokenlist)
|
|
{
|
|
std::map<nonneg int, const Token *> constantArrays;
|
|
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (tok->varId() > 0) {
|
|
// array
|
|
const std::map<nonneg int, const Token *>::const_iterator it = constantArrays.find(tok->varId());
|
|
if (it != constantArrays.end()) {
|
|
ValueFlow::Value value;
|
|
value.valueType = ValueFlow::Value::ValueType::TOK;
|
|
value.tokvalue = it->second;
|
|
value.setKnown();
|
|
setTokenValue(tok, value, tokenlist->getSettings());
|
|
}
|
|
|
|
// pointer = array
|
|
else if (tok->variable() &&
|
|
tok->variable()->isArray() &&
|
|
Token::simpleMatch(tok->astParent(), "=") &&
|
|
tok == tok->astParent()->astOperand2() &&
|
|
tok->astParent()->astOperand1() &&
|
|
tok->astParent()->astOperand1()->variable() &&
|
|
tok->astParent()->astOperand1()->variable()->isPointer()) {
|
|
ValueFlow::Value value;
|
|
value.valueType = ValueFlow::Value::ValueType::TOK;
|
|
value.tokvalue = tok;
|
|
value.setKnown();
|
|
setTokenValue(tok, value, tokenlist->getSettings());
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (Token::Match(tok, "const %type% %var% [ %num%| ] = {")) {
|
|
const Token *vartok = tok->tokAt(2);
|
|
const Token *rhstok = vartok->next()->link()->tokAt(2);
|
|
constantArrays[vartok->varId()] = rhstok;
|
|
tok = rhstok->link();
|
|
continue;
|
|
}
|
|
|
|
else if (Token::Match(tok, "const char %var% [ %num%| ] = %str% ;")) {
|
|
const Token *vartok = tok->tokAt(2);
|
|
const Token *strtok = vartok->next()->link()->tokAt(2);
|
|
constantArrays[vartok->varId()] = strtok;
|
|
tok = strtok->next();
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool isNonZero(const Token *tok)
|
|
{
|
|
return tok && (!tok->hasKnownIntValue() || tok->values().front().intvalue != 0);
|
|
}
|
|
|
|
static const Token *getOtherOperand(const Token *tok)
|
|
{
|
|
if (!tok)
|
|
return nullptr;
|
|
if (!tok->astParent())
|
|
return nullptr;
|
|
if (tok->astParent()->astOperand1() != tok)
|
|
return tok->astParent()->astOperand1();
|
|
if (tok->astParent()->astOperand2() != tok)
|
|
return tok->astParent()->astOperand2();
|
|
return nullptr;
|
|
}
|
|
|
|
static void valueFlowArrayBool(TokenList *tokenlist)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (tok->hasKnownIntValue())
|
|
continue;
|
|
const Variable *var = nullptr;
|
|
bool known = false;
|
|
std::list<ValueFlow::Value>::const_iterator val =
|
|
std::find_if(tok->values().begin(), tok->values().end(), std::mem_fn(&ValueFlow::Value::isTokValue));
|
|
if (val == tok->values().end()) {
|
|
var = tok->variable();
|
|
known = true;
|
|
} else {
|
|
var = val->tokvalue->variable();
|
|
known = val->isKnown();
|
|
}
|
|
if (!var)
|
|
continue;
|
|
if (!var->isArray() || var->isArgument() || var->isStlType())
|
|
continue;
|
|
if (isNonZero(getOtherOperand(tok)) && Token::Match(tok->astParent(), "%comp%"))
|
|
continue;
|
|
// TODO: Check for function argument
|
|
if ((astIsBool(tok->astParent()) && !Token::Match(tok->astParent(), "(|%name%")) ||
|
|
(tok->astParent() && Token::Match(tok->astParent()->previous(), "if|while|for ("))) {
|
|
ValueFlow::Value value{1};
|
|
if (known)
|
|
value.setKnown();
|
|
setTokenValue(tok, value, tokenlist->getSettings());
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowPointerAlias(TokenList *tokenlist)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
// not address of
|
|
if (!tok->isUnaryOp("&"))
|
|
continue;
|
|
|
|
// parent should be a '='
|
|
if (!Token::simpleMatch(tok->astParent(), "="))
|
|
continue;
|
|
|
|
// child should be some buffer or variable
|
|
const Token *vartok = tok->astOperand1();
|
|
while (vartok) {
|
|
if (vartok->str() == "[")
|
|
vartok = vartok->astOperand1();
|
|
else if (vartok->str() == "." || vartok->str() == "::")
|
|
vartok = vartok->astOperand2();
|
|
else
|
|
break;
|
|
}
|
|
if (!(vartok && vartok->variable() && !vartok->variable()->isPointer()))
|
|
continue;
|
|
|
|
ValueFlow::Value value;
|
|
value.valueType = ValueFlow::Value::ValueType::TOK;
|
|
value.tokvalue = tok;
|
|
setTokenValue(tok, value, tokenlist->getSettings());
|
|
}
|
|
}
|
|
|
|
static void valueFlowPointerAliasDeref(TokenList *tokenlist)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (!tok->isUnaryOp("*"))
|
|
continue;
|
|
if (!astIsPointer(tok->astOperand1()))
|
|
continue;
|
|
|
|
const Token* lifeTok = nullptr;
|
|
ErrorPath errorPath;
|
|
for (const ValueFlow::Value& v:tok->astOperand1()->values()) {
|
|
if (!v.isLocalLifetimeValue())
|
|
continue;
|
|
lifeTok = v.tokvalue;
|
|
errorPath = v.errorPath;
|
|
}
|
|
if (!lifeTok)
|
|
continue;
|
|
if (lifeTok->varId() == 0)
|
|
continue;
|
|
const Variable * var = lifeTok->variable();
|
|
if (!var)
|
|
continue;
|
|
if (!var->isConst() && isVariableChanged(lifeTok->next(), tok, lifeTok->varId(), !var->isLocal(), tokenlist->getSettings(), tokenlist->isCPP()))
|
|
continue;
|
|
for (const ValueFlow::Value& v:lifeTok->values()) {
|
|
// TODO: Move container size values to generic forward
|
|
// Forward uninit values since not all values can be forwarded directly
|
|
if (!(v.isContainerSizeValue() || v.isUninitValue()))
|
|
continue;
|
|
ValueFlow::Value value = v;
|
|
value.errorPath.insert(value.errorPath.begin(), errorPath.begin(), errorPath.end());
|
|
setTokenValue(tok, value, tokenlist->getSettings());
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowBitAnd(TokenList *tokenlist)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (tok->str() != "&")
|
|
continue;
|
|
|
|
if (tok->hasKnownValue())
|
|
continue;
|
|
|
|
if (!tok->astOperand1() || !tok->astOperand2())
|
|
continue;
|
|
|
|
MathLib::bigint number;
|
|
if (MathLib::isInt(tok->astOperand1()->str()))
|
|
number = MathLib::toLongNumber(tok->astOperand1()->str());
|
|
else if (MathLib::isInt(tok->astOperand2()->str()))
|
|
number = MathLib::toLongNumber(tok->astOperand2()->str());
|
|
else
|
|
continue;
|
|
|
|
int bit = 0;
|
|
while (bit <= (MathLib::bigint_bits - 2) && ((((MathLib::bigint)1) << bit) < number))
|
|
++bit;
|
|
|
|
if ((((MathLib::bigint)1) << bit) == number) {
|
|
setTokenValue(tok, ValueFlow::Value(0), tokenlist->getSettings());
|
|
setTokenValue(tok, ValueFlow::Value(number), tokenlist->getSettings());
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowSameExpressions(TokenList *tokenlist)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (tok->hasKnownValue())
|
|
continue;
|
|
|
|
if (!tok->astOperand1() || !tok->astOperand2())
|
|
continue;
|
|
|
|
if (tok->astOperand1()->isLiteral() || tok->astOperand2()->isLiteral())
|
|
continue;
|
|
|
|
if (!astIsIntegral(tok->astOperand1(), false) && !astIsIntegral(tok->astOperand2(), false))
|
|
continue;
|
|
|
|
ValueFlow::Value val;
|
|
|
|
if (Token::Match(tok, "==|>=|<=|/")) {
|
|
val = ValueFlow::Value(1);
|
|
val.setKnown();
|
|
}
|
|
|
|
if (Token::Match(tok, "!=|>|<|%|-")) {
|
|
val = ValueFlow::Value(0);
|
|
val.setKnown();
|
|
}
|
|
|
|
if (!val.isKnown())
|
|
continue;
|
|
|
|
if (isSameExpression(tokenlist->isCPP(), false, tok->astOperand1(), tok->astOperand2(), tokenlist->getSettings()->library, true, true, &val.errorPath)) {
|
|
setTokenValue(tok, val, tokenlist->getSettings());
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool getExpressionRange(const Token *expr, MathLib::bigint *minvalue, MathLib::bigint *maxvalue)
|
|
{
|
|
if (expr->hasKnownIntValue()) {
|
|
if (minvalue)
|
|
*minvalue = expr->values().front().intvalue;
|
|
if (maxvalue)
|
|
*maxvalue = expr->values().front().intvalue;
|
|
return true;
|
|
}
|
|
|
|
if (expr->str() == "&" && expr->astOperand1() && expr->astOperand2()) {
|
|
MathLib::bigint vals[4];
|
|
bool lhsHasKnownRange = getExpressionRange(expr->astOperand1(), &vals[0], &vals[1]);
|
|
bool rhsHasKnownRange = getExpressionRange(expr->astOperand2(), &vals[2], &vals[3]);
|
|
if (!lhsHasKnownRange && !rhsHasKnownRange)
|
|
return false;
|
|
if (!lhsHasKnownRange || !rhsHasKnownRange) {
|
|
if (minvalue)
|
|
*minvalue = lhsHasKnownRange ? vals[0] : vals[2];
|
|
if (maxvalue)
|
|
*maxvalue = lhsHasKnownRange ? vals[1] : vals[3];
|
|
} else {
|
|
if (minvalue)
|
|
*minvalue = vals[0] & vals[2];
|
|
if (maxvalue)
|
|
*maxvalue = vals[1] & vals[3];
|
|
}
|
|
return true;
|
|
}
|
|
|
|
if (expr->str() == "%" && expr->astOperand1() && expr->astOperand2()) {
|
|
MathLib::bigint vals[4];
|
|
if (!getExpressionRange(expr->astOperand2(), &vals[2], &vals[3]))
|
|
return false;
|
|
if (vals[2] <= 0)
|
|
return false;
|
|
bool lhsHasKnownRange = getExpressionRange(expr->astOperand1(), &vals[0], &vals[1]);
|
|
if (lhsHasKnownRange && vals[0] < 0)
|
|
return false;
|
|
// If lhs has unknown value, it must be unsigned
|
|
if (!lhsHasKnownRange && (!expr->astOperand1()->valueType() || expr->astOperand1()->valueType()->sign != ValueType::Sign::UNSIGNED))
|
|
return false;
|
|
if (minvalue)
|
|
*minvalue = 0;
|
|
if (maxvalue)
|
|
*maxvalue = vals[3] - 1;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void valueFlowRightShift(TokenList *tokenList, const Settings* settings)
|
|
{
|
|
for (Token *tok = tokenList->front(); tok; tok = tok->next()) {
|
|
if (tok->str() != ">>")
|
|
continue;
|
|
|
|
if (tok->hasKnownValue())
|
|
continue;
|
|
|
|
if (!tok->astOperand1() || !tok->astOperand2())
|
|
continue;
|
|
|
|
if (!tok->astOperand2()->hasKnownValue())
|
|
continue;
|
|
|
|
const MathLib::bigint rhsvalue = tok->astOperand2()->values().front().intvalue;
|
|
if (rhsvalue < 0)
|
|
continue;
|
|
|
|
if (!tok->astOperand1()->valueType() || !tok->astOperand1()->valueType()->isIntegral())
|
|
continue;
|
|
|
|
if (!tok->astOperand2()->valueType() || !tok->astOperand2()->valueType()->isIntegral())
|
|
continue;
|
|
|
|
MathLib::bigint lhsmax=0;
|
|
if (!getExpressionRange(tok->astOperand1(), nullptr, &lhsmax))
|
|
continue;
|
|
if (lhsmax < 0)
|
|
continue;
|
|
int lhsbits;
|
|
if ((tok->astOperand1()->valueType()->type == ValueType::Type::CHAR) ||
|
|
(tok->astOperand1()->valueType()->type == ValueType::Type::SHORT) ||
|
|
(tok->astOperand1()->valueType()->type == ValueType::Type::WCHAR_T) ||
|
|
(tok->astOperand1()->valueType()->type == ValueType::Type::BOOL) ||
|
|
(tok->astOperand1()->valueType()->type == ValueType::Type::INT))
|
|
lhsbits = settings->int_bit;
|
|
else if (tok->astOperand1()->valueType()->type == ValueType::Type::LONG)
|
|
lhsbits = settings->long_bit;
|
|
else if (tok->astOperand1()->valueType()->type == ValueType::Type::LONGLONG)
|
|
lhsbits = settings->long_long_bit;
|
|
else
|
|
continue;
|
|
if (rhsvalue >= lhsbits || rhsvalue >= MathLib::bigint_bits || (1ULL << rhsvalue) <= lhsmax)
|
|
continue;
|
|
|
|
ValueFlow::Value val(0);
|
|
val.setKnown();
|
|
setTokenValue(tok, val, tokenList->getSettings());
|
|
}
|
|
}
|
|
|
|
static void valueFlowEnumValue(SymbolDatabase * symboldatabase, const Settings * settings)
|
|
{
|
|
|
|
for (Scope & scope : symboldatabase->scopeList) {
|
|
if (scope.type != Scope::eEnum)
|
|
continue;
|
|
MathLib::bigint value = 0;
|
|
bool prev_enum_is_known = true;
|
|
|
|
for (Enumerator & enumerator : scope.enumeratorList) {
|
|
if (enumerator.start) {
|
|
Token *rhs = enumerator.start->previous()->astOperand2();
|
|
ValueFlow::valueFlowConstantFoldAST(rhs, settings);
|
|
if (rhs && rhs->hasKnownIntValue()) {
|
|
enumerator.value = rhs->values().front().intvalue;
|
|
enumerator.value_known = true;
|
|
value = enumerator.value + 1;
|
|
prev_enum_is_known = true;
|
|
} else
|
|
prev_enum_is_known = false;
|
|
} else if (prev_enum_is_known) {
|
|
enumerator.value = value++;
|
|
enumerator.value_known = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowGlobalConstVar(TokenList* tokenList, const Settings *settings)
|
|
{
|
|
// Get variable values...
|
|
std::map<const Variable*, ValueFlow::Value> vars;
|
|
for (const Token* tok = tokenList->front(); tok; tok = tok->next()) {
|
|
if (!tok->variable())
|
|
continue;
|
|
// Initialization...
|
|
if (tok == tok->variable()->nameToken() &&
|
|
!tok->variable()->isVolatile() &&
|
|
!tok->variable()->isArgument() &&
|
|
tok->variable()->isConst() &&
|
|
tok->valueType() &&
|
|
tok->valueType()->isIntegral() &&
|
|
tok->valueType()->pointer == 0 &&
|
|
tok->valueType()->constness == 1 &&
|
|
Token::Match(tok, "%name% =") &&
|
|
tok->next()->astOperand2() &&
|
|
tok->next()->astOperand2()->hasKnownIntValue()) {
|
|
vars[tok->variable()] = tok->next()->astOperand2()->values().front();
|
|
}
|
|
}
|
|
|
|
// Set values..
|
|
for (Token* tok = tokenList->front(); tok; tok = tok->next()) {
|
|
if (!tok->variable())
|
|
continue;
|
|
std::map<const Variable*, ValueFlow::Value>::const_iterator var = vars.find(tok->variable());
|
|
if (var == vars.end())
|
|
continue;
|
|
setTokenValue(tok, var->second, settings);
|
|
}
|
|
}
|
|
|
|
static void valueFlowGlobalStaticVar(TokenList *tokenList, const Settings *settings)
|
|
{
|
|
// Get variable values...
|
|
std::map<const Variable *, ValueFlow::Value> vars;
|
|
for (const Token *tok = tokenList->front(); tok; tok = tok->next()) {
|
|
if (!tok->variable())
|
|
continue;
|
|
// Initialization...
|
|
if (tok == tok->variable()->nameToken() &&
|
|
tok->variable()->isStatic() &&
|
|
!tok->variable()->isConst() &&
|
|
tok->valueType() &&
|
|
tok->valueType()->isIntegral() &&
|
|
tok->valueType()->pointer == 0 &&
|
|
tok->valueType()->constness == 0 &&
|
|
Token::Match(tok, "%name% =") &&
|
|
tok->next()->astOperand2() &&
|
|
tok->next()->astOperand2()->hasKnownIntValue()) {
|
|
vars[tok->variable()] = tok->next()->astOperand2()->values().front();
|
|
} else {
|
|
// If variable is written anywhere in TU then remove it from vars
|
|
if (!tok->astParent())
|
|
continue;
|
|
if (Token::Match(tok->astParent(), "++|--|&") && !tok->astParent()->astOperand2())
|
|
vars.erase(tok->variable());
|
|
else if (tok->astParent()->isAssignmentOp()) {
|
|
if (tok == tok->astParent()->astOperand1())
|
|
vars.erase(tok->variable());
|
|
else if (tokenList->isCPP() && Token::Match(tok->astParent()->tokAt(-2), "& %name% ="))
|
|
vars.erase(tok->variable());
|
|
} else if (isLikelyStreamRead(tokenList->isCPP(), tok->astParent())) {
|
|
vars.erase(tok->variable());
|
|
} else if (Token::Match(tok->astParent(), "[(,]"))
|
|
vars.erase(tok->variable());
|
|
}
|
|
}
|
|
|
|
// Set values..
|
|
for (Token *tok = tokenList->front(); tok; tok = tok->next()) {
|
|
if (!tok->variable())
|
|
continue;
|
|
std::map<const Variable *, ValueFlow::Value>::const_iterator var = vars.find(tok->variable());
|
|
if (var == vars.end())
|
|
continue;
|
|
setTokenValue(tok, var->second, settings);
|
|
}
|
|
}
|
|
|
|
static Analyzer::Action valueFlowForwardVariable(Token* const startToken,
|
|
const Token* const endToken,
|
|
const Variable* const var,
|
|
std::list<ValueFlow::Value> values,
|
|
TokenList* const tokenlist,
|
|
const Settings* const settings);
|
|
|
|
static void valueFlowReverse(TokenList* tokenlist,
|
|
Token* tok,
|
|
const Token* const varToken,
|
|
ValueFlow::Value val,
|
|
ValueFlow::Value val2,
|
|
ErrorLogger* errorLogger,
|
|
const Settings* settings);
|
|
|
|
static bool isConditionKnown(const Token* tok, bool then)
|
|
{
|
|
const char* op = "||";
|
|
if (then)
|
|
op = "&&";
|
|
const Token* parent = tok->astParent();
|
|
while (parent && (parent->str() == op || parent->str() == "!"))
|
|
parent = parent->astParent();
|
|
return (parent && parent->str() == "(");
|
|
}
|
|
|
|
static void valueFlowAST(Token *tok, nonneg int varid, const ValueFlow::Value &value, const Settings *settings)
|
|
{
|
|
if (!tok)
|
|
return;
|
|
if (tok->varId() == varid)
|
|
setTokenValue(tok, value, settings);
|
|
valueFlowAST(tok->astOperand1(), varid, value, settings);
|
|
if (tok->str() == "&&" && tok->astOperand1() && tok->astOperand1()->getValue(0)) {
|
|
ProgramMemory pm;
|
|
pm.setValue(varid,value);
|
|
if (conditionIsFalse(tok->astOperand1(), pm))
|
|
return;
|
|
} else if (tok->str() == "||" && tok->astOperand1()) {
|
|
const std::list<ValueFlow::Value> &values = tok->astOperand1()->values();
|
|
const bool nonzero = std::any_of(values.cbegin(), values.cend(),
|
|
[=](const ValueFlow::Value &v) {
|
|
return v.intvalue != 0;
|
|
});
|
|
if (!nonzero)
|
|
return;
|
|
ProgramMemory pm;
|
|
pm.setValue(varid,value);
|
|
if (conditionIsTrue(tok->astOperand1(), pm))
|
|
return;
|
|
}
|
|
valueFlowAST(tok->astOperand2(), varid, value, settings);
|
|
}
|
|
|
|
static const std::string& invertAssign(const std::string& assign)
|
|
{
|
|
static std::unordered_map<std::string, std::string> lookup = {
|
|
{"+=", "-="}, {"-=", "+="}, {"*=", "/="}, {"/=", "*="}, {"<<=", ">>="}, {">>=", "<<="}, {"^=", "^="}
|
|
};
|
|
static std::string empty;
|
|
auto it = lookup.find(assign);
|
|
if (it == lookup.end())
|
|
return empty;
|
|
else
|
|
return it->second;
|
|
}
|
|
|
|
static bool evalAssignment(ValueFlow::Value &lhsValue, const std::string &assign, const ValueFlow::Value &rhsValue)
|
|
{
|
|
if (lhsValue.isIntValue()) {
|
|
if (assign == "=")
|
|
lhsValue.intvalue = rhsValue.intvalue;
|
|
else if (assign == "+=")
|
|
lhsValue.intvalue += rhsValue.intvalue;
|
|
else if (assign == "-=")
|
|
lhsValue.intvalue -= rhsValue.intvalue;
|
|
else if (assign == "*=")
|
|
lhsValue.intvalue *= rhsValue.intvalue;
|
|
else if (assign == "/=") {
|
|
if (rhsValue.intvalue == 0)
|
|
return false;
|
|
lhsValue.intvalue /= rhsValue.intvalue;
|
|
} else if (assign == "%=") {
|
|
if (rhsValue.intvalue == 0)
|
|
return false;
|
|
lhsValue.intvalue %= rhsValue.intvalue;
|
|
} else if (assign == "&=")
|
|
lhsValue.intvalue &= rhsValue.intvalue;
|
|
else if (assign == "|=")
|
|
lhsValue.intvalue |= rhsValue.intvalue;
|
|
else if (assign == "^=")
|
|
lhsValue.intvalue ^= rhsValue.intvalue;
|
|
else if (assign == "<<=") {
|
|
if (rhsValue.intvalue < 0)
|
|
return false;
|
|
lhsValue.intvalue <<= rhsValue.intvalue;
|
|
} else if (assign == ">>=") {
|
|
if (rhsValue.intvalue < 0)
|
|
return false;
|
|
lhsValue.intvalue >>= rhsValue.intvalue;
|
|
} else
|
|
return false;
|
|
} else if (lhsValue.isFloatValue()) {
|
|
if (assign == "=")
|
|
lhsValue.intvalue = rhsValue.intvalue;
|
|
else if (assign == "+=")
|
|
lhsValue.floatValue += rhsValue.intvalue;
|
|
else if (assign == "-=")
|
|
lhsValue.floatValue -= rhsValue.intvalue;
|
|
else if (assign == "*=")
|
|
lhsValue.floatValue *= rhsValue.intvalue;
|
|
else if (assign == "/=")
|
|
lhsValue.floatValue /= rhsValue.intvalue;
|
|
else
|
|
return false;
|
|
} else {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
template<class T>
|
|
struct SingleRange {
|
|
T* x;
|
|
T* begin() const {
|
|
return x;
|
|
}
|
|
T* end() const {
|
|
return x+1;
|
|
}
|
|
};
|
|
|
|
template<class T>
|
|
SingleRange<T> MakeSingleRange(T& x)
|
|
{
|
|
return {&x};
|
|
}
|
|
|
|
class SelectValueFromVarIdMapRange {
|
|
using M = std::unordered_map<nonneg int, ValueFlow::Value>;
|
|
|
|
struct Iterator {
|
|
using iterator_category = std::forward_iterator_tag;
|
|
using value_type = const ValueFlow::Value;
|
|
using pointer = value_type *;
|
|
using reference = value_type &;
|
|
|
|
explicit Iterator(const M::const_iterator &it)
|
|
: mIt(it) {
|
|
}
|
|
|
|
reference operator*() const {
|
|
return mIt->second;
|
|
}
|
|
|
|
pointer operator->() {
|
|
return &mIt->second;
|
|
}
|
|
|
|
Iterator &operator++() {
|
|
// cppcheck-suppress postfixOperator - forward iterator needs to perform post-increment
|
|
mIt++;
|
|
return *this;
|
|
}
|
|
|
|
friend bool operator==(const Iterator &a, const Iterator &b) {
|
|
return a.mIt == b.mIt;
|
|
}
|
|
|
|
friend bool operator!=(const Iterator &a, const Iterator &b) {
|
|
return a.mIt != b.mIt;
|
|
}
|
|
|
|
private:
|
|
M::const_iterator mIt;
|
|
};
|
|
|
|
public:
|
|
explicit SelectValueFromVarIdMapRange(const M *m)
|
|
: mMap(m) {
|
|
}
|
|
|
|
Iterator begin() const {
|
|
return Iterator(mMap->begin());
|
|
}
|
|
Iterator end() const {
|
|
return Iterator(mMap->end());
|
|
}
|
|
|
|
private:
|
|
const M *mMap;
|
|
};
|
|
|
|
// Check if its an alias of the variable or is being aliased to this variable
|
|
template<typename V>
|
|
static bool isAliasOf(const Variable * var, const Token *tok, nonneg int varid, const V& values, bool* inconclusive = nullptr)
|
|
{
|
|
if (tok->varId() == varid)
|
|
return false;
|
|
if (tok->varId() == 0)
|
|
return false;
|
|
if (isAliasOf(tok, varid, inconclusive))
|
|
return true;
|
|
if (var && !var->isPointer())
|
|
return false;
|
|
// Search through non value aliases
|
|
for (const ValueFlow::Value &val : values) {
|
|
if (!val.isNonValue())
|
|
continue;
|
|
if (val.isInconclusive())
|
|
continue;
|
|
if (val.isLifetimeValue() && !val.isLocalLifetimeValue())
|
|
continue;
|
|
if (val.isLifetimeValue() && val.lifetimeKind != ValueFlow::Value::LifetimeKind::Address)
|
|
continue;
|
|
if (!Token::Match(val.tokvalue, ".|&|*|%var%"))
|
|
continue;
|
|
if (astHasVar(val.tokvalue, tok->varId()))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static const ValueFlow::Value* getKnownValue(const Token* tok, ValueFlow::Value::ValueType type)
|
|
{
|
|
if (!tok)
|
|
return nullptr;
|
|
auto it = std::find_if(tok->values().begin(), tok->values().end(), [&](const ValueFlow::Value& v) {
|
|
return v.isKnown() && v.valueType == type;
|
|
});
|
|
if (it != tok->values().end())
|
|
return &*it;
|
|
return nullptr;
|
|
}
|
|
|
|
static bool bifurcate(const Token* tok, const std::set<nonneg int>& varids, const Settings* settings, int depth = 20);
|
|
|
|
static bool bifurcateVariableChanged(const Variable* var,
|
|
const std::set<nonneg int>& varids,
|
|
const Token* start,
|
|
const Token* end,
|
|
const Settings* settings,
|
|
int depth = 20)
|
|
{
|
|
bool result = false;
|
|
const Token* tok = start;
|
|
while ((tok = findVariableChanged(
|
|
tok->next(), end, var->isPointer(), var->declarationId(), var->isGlobal(), settings, true))) {
|
|
if (Token::Match(tok->astParent(), "%assign%")) {
|
|
if (!bifurcate(tok->astParent()->astOperand2(), varids, settings, depth - 1))
|
|
return true;
|
|
} else {
|
|
result = true;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static bool bifurcate(const Token* tok, const std::set<nonneg int>& varids, const Settings* settings, int depth)
|
|
{
|
|
if (depth < 0)
|
|
return false;
|
|
if (!tok)
|
|
return true;
|
|
if (tok->hasKnownIntValue())
|
|
return true;
|
|
if (Token::Match(tok, "%cop%"))
|
|
return bifurcate(tok->astOperand1(), varids, settings, depth) && bifurcate(tok->astOperand2(), varids, settings, depth);
|
|
if (Token::Match(tok, "%var%")) {
|
|
if (varids.count(tok->varId()) > 0)
|
|
return true;
|
|
const Variable* var = tok->variable();
|
|
if (!var)
|
|
return false;
|
|
const Token* start = var->declEndToken();
|
|
if (!start)
|
|
return false;
|
|
if (start->strAt(-1) == ")" || start->strAt(-1) == "}")
|
|
return false;
|
|
if (Token::Match(start, "; %varid% =", var->declarationId()))
|
|
start = start->tokAt(2);
|
|
if (var->isConst() || !bifurcateVariableChanged(var, varids, start, tok, settings, depth))
|
|
return var->isArgument() || bifurcate(start->astOperand2(), varids, settings, depth - 1);
|
|
return false;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
struct ValueFlowAnalyzer : Analyzer {
|
|
const TokenList* tokenlist;
|
|
ProgramMemoryState pms;
|
|
|
|
ValueFlowAnalyzer() : tokenlist(nullptr), pms() {}
|
|
|
|
ValueFlowAnalyzer(const TokenList* t) : tokenlist(t), pms() {}
|
|
|
|
virtual const ValueFlow::Value* getValue(const Token* tok) const = 0;
|
|
virtual ValueFlow::Value* getValue(const Token* tok) = 0;
|
|
|
|
virtual void makeConditional() = 0;
|
|
|
|
virtual void addErrorPath(const Token* tok, const std::string& s) = 0;
|
|
|
|
virtual bool match(const Token* tok) const = 0;
|
|
|
|
virtual bool isAlias(const Token* tok, bool& inconclusive) const = 0;
|
|
|
|
using ProgramState = std::unordered_map<nonneg int, ValueFlow::Value>;
|
|
|
|
virtual ProgramState getProgramState() const = 0;
|
|
|
|
virtual const ValueType* getValueType(const Token*) const {
|
|
return nullptr;
|
|
}
|
|
virtual int getIndirect(const Token* tok) const {
|
|
const ValueFlow::Value* value = getValue(tok);
|
|
if (value)
|
|
return value->indirect;
|
|
return 0;
|
|
}
|
|
|
|
virtual bool isGlobal() const {
|
|
return false;
|
|
}
|
|
|
|
virtual bool invalid() const {
|
|
return false;
|
|
}
|
|
|
|
bool isCPP() const {
|
|
return tokenlist->isCPP();
|
|
}
|
|
|
|
const Settings* getSettings() const {
|
|
return tokenlist->getSettings();
|
|
}
|
|
|
|
virtual Action isModified(const Token* tok) const {
|
|
Action read = Action::Read;
|
|
bool inconclusive = false;
|
|
if (isVariableChangedByFunctionCall(tok, getIndirect(tok), getSettings(), &inconclusive))
|
|
return read | Action::Invalid;
|
|
if (inconclusive)
|
|
return read | Action::Inconclusive;
|
|
if (isVariableChanged(tok, getIndirect(tok), getSettings(), isCPP())) {
|
|
if (Token::Match(tok->astParent(), "*|[|.|++|--"))
|
|
return read | Action::Invalid;
|
|
const ValueFlow::Value* value = getValue(tok);
|
|
// Check if its assigned to the same value
|
|
if (value && !value->isImpossible() && Token::simpleMatch(tok->astParent(), "=") && astIsLHS(tok) &&
|
|
astIsIntegral(tok->astParent()->astOperand2(), false)) {
|
|
std::vector<int> result = evaluate(tok->astParent()->astOperand2());
|
|
if (!result.empty() && value->equalTo(result.front()))
|
|
return Action::Idempotent;
|
|
}
|
|
return Action::Invalid;
|
|
}
|
|
return read;
|
|
}
|
|
|
|
virtual Action isAliasModified(const Token* tok) const {
|
|
int indirect = 0;
|
|
int baseIndirect = 0;
|
|
const ValueType* vt = getValueType(tok);
|
|
if (vt)
|
|
baseIndirect = vt->pointer;
|
|
if (tok->valueType())
|
|
indirect = std::max<int>(0, tok->valueType()->pointer - baseIndirect);
|
|
if (isVariableChanged(tok, indirect, getSettings(), isCPP()))
|
|
return Action::Invalid;
|
|
return Action::None;
|
|
}
|
|
|
|
virtual Action isWritable(const Token* tok, Direction d) const {
|
|
const ValueFlow::Value* value = getValue(tok);
|
|
if (!value)
|
|
return Action::None;
|
|
if (!(value->isIntValue() || value->isFloatValue()))
|
|
return Action::None;
|
|
const Token* parent = tok->astParent();
|
|
|
|
if (parent && parent->isAssignmentOp() && astIsLHS(tok) &&
|
|
parent->astOperand2()->hasKnownValue()) {
|
|
// If the operator is invertible
|
|
if (d == Direction::Reverse && (parent->str() == "&=" || parent->str() == "|=" || parent->str() == "%="))
|
|
return Action::None;
|
|
const Token* rhs = parent->astOperand2();
|
|
const ValueFlow::Value* rhsValue = getKnownValue(rhs, ValueFlow::Value::ValueType::INT);
|
|
Action a;
|
|
if (!rhsValue)
|
|
a = Action::Invalid;
|
|
else
|
|
a = Action::Write;
|
|
if (parent->str() != "=") {
|
|
a |= Action::Read;
|
|
} else {
|
|
if (rhsValue && !value->isImpossible() && value->equalValue(*rhsValue))
|
|
a = Action::Idempotent;
|
|
a |= Action::Incremental;
|
|
}
|
|
return a;
|
|
}
|
|
|
|
// increment/decrement
|
|
if (Token::Match(tok->previous(), "++|-- %name%") || Token::Match(tok, "%name% ++|--")) {
|
|
return Action::Read | Action::Write | Action::Incremental;
|
|
}
|
|
return Action::None;
|
|
}
|
|
|
|
static const std::string& getAssign(const Token* tok, Direction d) {
|
|
if (d == Direction::Forward)
|
|
return tok->str();
|
|
else
|
|
return invertAssign(tok->str());
|
|
}
|
|
|
|
virtual void writeValue(ValueFlow::Value* value, const Token* tok, Direction d) const {
|
|
if (!value)
|
|
return;
|
|
if (!tok->astParent())
|
|
return;
|
|
if (tok->astParent()->isAssignmentOp()) {
|
|
// TODO: Check result
|
|
if (evalAssignment(*value,
|
|
getAssign(tok->astParent(), d),
|
|
*getKnownValue(tok->astParent()->astOperand2(), ValueFlow::Value::ValueType::INT))) {
|
|
const std::string info("Compound assignment '" + tok->astParent()->str() + "', assigned value is " +
|
|
value->infoString());
|
|
if (tok->astParent()->str() == "=")
|
|
value->errorPath.clear();
|
|
value->errorPath.emplace_back(tok, info);
|
|
} else {
|
|
// TODO: Don't set to zero
|
|
value->intvalue = 0;
|
|
}
|
|
} else if (tok->astParent()->tokType() == Token::eIncDecOp) {
|
|
bool inc = tok->astParent()->str() == "++";
|
|
std::string opName(inc ? "incremented" : "decremented");
|
|
if (d == Direction::Reverse)
|
|
inc = !inc;
|
|
value->intvalue += (inc ? 1 : -1);
|
|
const std::string info(tok->str() + " is " + opName + "', new value is " + value->infoString());
|
|
value->errorPath.emplace_back(tok, info);
|
|
}
|
|
}
|
|
|
|
Action analyzeMatch(const Token* tok, Direction d) const {
|
|
const Token* parent = tok->astParent();
|
|
if (astIsPointer(tok) && (Token::Match(parent, "*|[") || (parent && parent->originalName() == "->")) && getIndirect(tok) <= 0)
|
|
return Action::Read;
|
|
|
|
Action w = isWritable(tok, d);
|
|
if (w != Action::None)
|
|
return w;
|
|
|
|
// Check for modifications by function calls
|
|
return isModified(tok);
|
|
}
|
|
|
|
Action analyzeToken(const Token* ref, const Token* tok, Direction d, bool inconclusiveRef) const {
|
|
if (!ref)
|
|
return Action::None;
|
|
// If its an inconclusiveRef then ref != tok
|
|
assert(!inconclusiveRef || ref != tok);
|
|
bool inconclusive = false;
|
|
if (match(ref)) {
|
|
if (inconclusiveRef) {
|
|
Action a = isModified(tok);
|
|
if (a.isModified() || a.isInconclusive())
|
|
return Action::Inconclusive;
|
|
} else {
|
|
return analyzeMatch(tok, d) | Action::Match;
|
|
}
|
|
} else if (ref->isUnaryOp("*")) {
|
|
const Token* lifeTok = nullptr;
|
|
for (const ValueFlow::Value& v:ref->astOperand1()->values()) {
|
|
if (!v.isLocalLifetimeValue())
|
|
continue;
|
|
if (lifeTok)
|
|
return Action::None;
|
|
lifeTok = v.tokvalue;
|
|
}
|
|
if (lifeTok && match(lifeTok)) {
|
|
Action a = Action::Read;
|
|
if (isModified(tok).isModified())
|
|
a = Action::Invalid;
|
|
if (Token::Match(tok->astParent(), "%assign%") && astIsLHS(tok))
|
|
a |= Action::Invalid;
|
|
if (inconclusiveRef && a.isModified())
|
|
return Action::Inconclusive;
|
|
return a;
|
|
}
|
|
return Action::None;
|
|
|
|
} else if (isAlias(ref, inconclusive)) {
|
|
inconclusive |= inconclusiveRef;
|
|
Action a = isAliasModified(tok);
|
|
if (inconclusive && a.isModified())
|
|
return Action::Inconclusive;
|
|
else
|
|
return a;
|
|
}
|
|
return Action::None;
|
|
}
|
|
|
|
virtual Action analyze(const Token* tok, Direction d) const OVERRIDE {
|
|
if (invalid())
|
|
return Action::Invalid;
|
|
// Follow references
|
|
std::vector<ReferenceToken> refs = followAllReferences(tok);
|
|
const bool inconclusiveRefs = refs.size() != 1;
|
|
for (const ReferenceToken& ref:refs) {
|
|
Action a = analyzeToken(ref.token, tok, d, inconclusiveRefs);
|
|
if (a != Action::None)
|
|
return a;
|
|
}
|
|
|
|
// TODO: Check if function is pure
|
|
if (Token::Match(tok, "%name% (") && !Token::simpleMatch(tok->linkAt(1), ") {")) {
|
|
// bailout: global non-const variables
|
|
if (isGlobal()) {
|
|
return Action::Invalid;
|
|
}
|
|
}
|
|
return Action::None;
|
|
}
|
|
|
|
virtual std::vector<int> evaluate(const Token* tok) const OVERRIDE {
|
|
if (tok->hasKnownIntValue())
|
|
return {static_cast<int>(tok->values().front().intvalue)};
|
|
std::vector<int> result;
|
|
ProgramMemory pm = pms.get(tok, getProgramState());
|
|
if (Token::Match(tok, "&&|%oror%")) {
|
|
if (conditionIsTrue(tok, pm))
|
|
result.push_back(1);
|
|
if (conditionIsFalse(tok, pm))
|
|
result.push_back(0);
|
|
} else {
|
|
MathLib::bigint out = 0;
|
|
bool error = false;
|
|
execute(tok, &pm, &out, &error);
|
|
if (!error)
|
|
result.push_back(out);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
virtual void assume(const Token* tok, bool state, const Token* at) OVERRIDE {
|
|
// Update program state
|
|
pms.removeModifiedVars(tok);
|
|
pms.addState(tok, getProgramState());
|
|
pms.assume(tok, state);
|
|
|
|
const bool isAssert = Token::Match(at, "assert|ASSERT");
|
|
|
|
if (!isAssert && !Token::simpleMatch(at, "}")) {
|
|
std::string s = state ? "true" : "false";
|
|
addErrorPath(tok, "Assuming condition is " + s);
|
|
}
|
|
if (!isAssert)
|
|
makeConditional();
|
|
}
|
|
|
|
virtual void update(Token* tok, Action a, Direction d) OVERRIDE {
|
|
ValueFlow::Value* value = getValue(tok);
|
|
if (!value)
|
|
return;
|
|
// Read first when moving forward
|
|
if (d == Direction::Forward && a.isRead())
|
|
setTokenValue(tok, *value, getSettings());
|
|
if (a.isInconclusive())
|
|
lowerToInconclusive();
|
|
if (a.isWrite() && tok->astParent()) {
|
|
writeValue(value, tok, d);
|
|
}
|
|
// Read last when moving in reverse
|
|
if (d == Direction::Reverse && a.isRead())
|
|
setTokenValue(tok, *value, getSettings());
|
|
}
|
|
|
|
virtual ValuePtr<Analyzer> reanalyze(Token*, const std::string&) const OVERRIDE {
|
|
return {};
|
|
}
|
|
};
|
|
|
|
ValuePtr<Analyzer> makeAnalyzer(Token* exprTok, const ValueFlow::Value& value, const TokenList* tokenlist);
|
|
|
|
struct SingleValueFlowAnalyzer : ValueFlowAnalyzer {
|
|
std::unordered_map<nonneg int, const Variable*> varids;
|
|
std::unordered_map<nonneg int, const Variable*> aliases;
|
|
ValueFlow::Value value;
|
|
|
|
SingleValueFlowAnalyzer() : ValueFlowAnalyzer() {}
|
|
|
|
SingleValueFlowAnalyzer(const ValueFlow::Value& v, const TokenList* t) : ValueFlowAnalyzer(t), value(v) {}
|
|
|
|
const std::unordered_map<nonneg int, const Variable*>& getVars() const {
|
|
return varids;
|
|
}
|
|
|
|
const std::unordered_map<nonneg int, const Variable*>& getAliasedVars() const {
|
|
return aliases;
|
|
}
|
|
|
|
virtual const ValueFlow::Value* getValue(const Token*) const OVERRIDE {
|
|
return &value;
|
|
}
|
|
virtual ValueFlow::Value* getValue(const Token*) OVERRIDE {
|
|
return &value;
|
|
}
|
|
|
|
virtual void makeConditional() OVERRIDE {
|
|
value.conditional = true;
|
|
}
|
|
|
|
virtual void addErrorPath(const Token* tok, const std::string& s) OVERRIDE {
|
|
value.errorPath.emplace_back(tok, s);
|
|
}
|
|
|
|
virtual bool isAlias(const Token* tok, bool& inconclusive) const OVERRIDE {
|
|
if (value.isLifetimeValue())
|
|
return false;
|
|
for (const auto& m: {
|
|
std::ref(getVars()), std::ref(getAliasedVars())
|
|
}) {
|
|
for (const auto& p:m.get()) {
|
|
nonneg int varid = p.first;
|
|
const Variable* var = p.second;
|
|
if (tok->varId() == varid)
|
|
return true;
|
|
if (isAliasOf(var, tok, varid, MakeSingleRange(value), &inconclusive))
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
virtual bool isGlobal() const OVERRIDE {
|
|
for (const auto&p:getVars()) {
|
|
const Variable* var = p.second;
|
|
if (!var->isLocal() && !var->isArgument() && !var->isConst())
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
virtual bool lowerToPossible() OVERRIDE {
|
|
if (value.isImpossible())
|
|
return false;
|
|
value.changeKnownToPossible();
|
|
return true;
|
|
}
|
|
virtual bool lowerToInconclusive() OVERRIDE {
|
|
if (value.isImpossible())
|
|
return false;
|
|
value.setInconclusive();
|
|
return true;
|
|
}
|
|
|
|
virtual bool isConditional() const OVERRIDE {
|
|
if (value.conditional)
|
|
return true;
|
|
if (value.condition)
|
|
return !value.isKnown() && !value.isImpossible();
|
|
return false;
|
|
}
|
|
|
|
virtual bool updateScope(const Token* endBlock, bool) const OVERRIDE {
|
|
const Scope* scope = endBlock->scope();
|
|
if (!scope)
|
|
return false;
|
|
if (scope->type == Scope::eLambda) {
|
|
return value.isLifetimeValue();
|
|
} else if (scope->type == Scope::eIf || scope->type == Scope::eElse || scope->type == Scope::eWhile ||
|
|
scope->type == Scope::eFor) {
|
|
if (value.isKnown() || value.isImpossible())
|
|
return true;
|
|
if (value.isLifetimeValue())
|
|
return true;
|
|
if (isConditional())
|
|
return false;
|
|
const Token* condTok = getCondTokFromEnd(endBlock);
|
|
std::set<nonneg int> varids2;
|
|
std::transform(getVars().begin(), getVars().end(), std::inserter(varids2, varids2.begin()), SelectMapKeys{});
|
|
return bifurcate(condTok, varids2, getSettings());
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
virtual ValuePtr<Analyzer> reanalyze(Token* tok, const std::string& msg) const OVERRIDE {
|
|
ValueFlow::Value newValue = value;
|
|
newValue.errorPath.emplace_back(tok, msg);
|
|
return makeAnalyzer(tok, newValue, tokenlist);
|
|
}
|
|
};
|
|
|
|
struct VariableAnalyzer : SingleValueFlowAnalyzer {
|
|
const Variable* var;
|
|
|
|
VariableAnalyzer() : SingleValueFlowAnalyzer(), var(nullptr) {}
|
|
|
|
VariableAnalyzer(const Variable* v,
|
|
const ValueFlow::Value& val,
|
|
std::vector<const Variable*> paliases,
|
|
const TokenList* t)
|
|
: SingleValueFlowAnalyzer(val, t), var(v) {
|
|
varids[var->declarationId()] = var;
|
|
for (const Variable* av:paliases) {
|
|
if (!av)
|
|
continue;
|
|
aliases[av->declarationId()] = av;
|
|
}
|
|
}
|
|
|
|
virtual const ValueType* getValueType(const Token*) const OVERRIDE {
|
|
return var->valueType();
|
|
}
|
|
|
|
virtual bool match(const Token* tok) const OVERRIDE {
|
|
return tok->varId() == var->declarationId();
|
|
}
|
|
|
|
virtual ProgramState getProgramState() const OVERRIDE {
|
|
ProgramState ps;
|
|
ps[var->declarationId()] = value;
|
|
return ps;
|
|
}
|
|
};
|
|
|
|
static std::vector<const Variable*> getAliasesFromValues(std::list<ValueFlow::Value> values, bool address=false)
|
|
{
|
|
std::vector<const Variable*> aliases;
|
|
for (const ValueFlow::Value& v : values) {
|
|
if (!v.tokvalue)
|
|
continue;
|
|
const Token* lifeTok = nullptr;
|
|
for (const ValueFlow::Value& lv:v.tokvalue->values()) {
|
|
if (!lv.isLocalLifetimeValue())
|
|
continue;
|
|
if (address && lv.lifetimeKind != ValueFlow::Value::LifetimeKind::Address)
|
|
continue;
|
|
if (lifeTok) {
|
|
lifeTok = nullptr;
|
|
break;
|
|
}
|
|
lifeTok = lv.tokvalue;
|
|
}
|
|
if (lifeTok && lifeTok->variable()) {
|
|
aliases.push_back(lifeTok->variable());
|
|
}
|
|
}
|
|
return aliases;
|
|
}
|
|
|
|
static Analyzer::Action valueFlowForwardVariable(Token* const startToken,
|
|
const Token* const endToken,
|
|
const Variable* const var,
|
|
std::list<ValueFlow::Value> values,
|
|
std::vector<const Variable*> aliases,
|
|
TokenList* const tokenlist,
|
|
const Settings* const settings)
|
|
{
|
|
Analyzer::Action actions;
|
|
for (ValueFlow::Value& v : values) {
|
|
VariableAnalyzer a(var, v, aliases, tokenlist);
|
|
actions |= valueFlowGenericForward(startToken, endToken, a, settings);
|
|
}
|
|
return actions;
|
|
}
|
|
|
|
static Analyzer::Action valueFlowForwardVariable(Token* const startToken,
|
|
const Token* const endToken,
|
|
const Variable* const var,
|
|
std::list<ValueFlow::Value> values,
|
|
TokenList* const tokenlist,
|
|
const Settings* const settings)
|
|
{
|
|
auto aliases = getAliasesFromValues(values);
|
|
return valueFlowForwardVariable(
|
|
startToken, endToken, var, std::move(values), std::move(aliases), tokenlist, settings);
|
|
}
|
|
|
|
// Old deprecated version
|
|
static bool valueFlowForwardVariable(Token* const startToken,
|
|
const Token* const endToken,
|
|
const Variable* const var,
|
|
const nonneg int,
|
|
std::list<ValueFlow::Value> values,
|
|
const bool,
|
|
const bool,
|
|
TokenList* const tokenlist,
|
|
ErrorLogger* const,
|
|
const Settings* const settings)
|
|
{
|
|
valueFlowForwardVariable(startToken, endToken, var, std::move(values), tokenlist, settings);
|
|
return true;
|
|
}
|
|
|
|
struct ExpressionAnalyzer : SingleValueFlowAnalyzer {
|
|
const Token* expr;
|
|
bool local;
|
|
bool unknown;
|
|
|
|
ExpressionAnalyzer() : SingleValueFlowAnalyzer(), expr(nullptr), local(true), unknown(false) {}
|
|
|
|
ExpressionAnalyzer(const Token* e, const ValueFlow::Value& val, const TokenList* t)
|
|
: SingleValueFlowAnalyzer(val, t), expr(e), local(true), unknown(false) {
|
|
|
|
setupExprVarIds();
|
|
}
|
|
|
|
virtual const ValueType* getValueType(const Token*) const OVERRIDE {
|
|
return expr->valueType();
|
|
}
|
|
|
|
static bool nonLocal(const Variable* var, bool deref) {
|
|
return !var || (!var->isLocal() && !var->isArgument()) || (deref && var->isArgument() && var->isPointer()) || var->isStatic() || var->isReference() || var->isExtern();
|
|
}
|
|
|
|
void setupExprVarIds() {
|
|
visitAstNodes(expr,
|
|
[&](const Token *tok) {
|
|
if (tok->varId() == 0 && tok->isName() && tok->previous()->str() != ".") {
|
|
// unknown variable
|
|
unknown = true;
|
|
return ChildrenToVisit::none;
|
|
}
|
|
if (tok->varId() > 0) {
|
|
varids[tok->varId()] = tok->variable();
|
|
if (!Token::simpleMatch(tok->previous(), ".")) {
|
|
const Variable *var = tok->variable();
|
|
if (var && var->isReference() && var->isLocal() && Token::Match(var->nameToken(), "%var% [=(]") && !isGlobalData(var->nameToken()->next()->astOperand2(), isCPP()))
|
|
return ChildrenToVisit::none;
|
|
const bool deref = tok->astParent() && (tok->astParent()->isUnaryOp("*") || (tok->astParent()->str() == "[" && tok == tok->astParent()->astOperand1()));
|
|
local &= !nonLocal(tok->variable(), deref);
|
|
}
|
|
}
|
|
return ChildrenToVisit::op1_and_op2;
|
|
});
|
|
}
|
|
|
|
virtual bool invalid() const OVERRIDE {
|
|
return unknown;
|
|
}
|
|
|
|
virtual ProgramState getProgramState() const OVERRIDE {
|
|
ProgramState ps;
|
|
ps[expr->exprId()] = value;
|
|
return ps;
|
|
}
|
|
|
|
virtual bool match(const Token* tok) const OVERRIDE {
|
|
return isSameExpression(isCPP(), true, expr, tok, getSettings()->library, true, true);
|
|
}
|
|
|
|
virtual bool isGlobal() const OVERRIDE {
|
|
return !local;
|
|
}
|
|
};
|
|
|
|
struct OppositeExpressionAnalyzer : ExpressionAnalyzer {
|
|
bool isNot;
|
|
|
|
OppositeExpressionAnalyzer() : ExpressionAnalyzer(), isNot(false) {}
|
|
|
|
OppositeExpressionAnalyzer(bool pIsNot, const Token* e, const ValueFlow::Value& val, const TokenList* t)
|
|
: ExpressionAnalyzer(e, val, t), isNot(pIsNot)
|
|
{}
|
|
|
|
virtual bool match(const Token* tok) const OVERRIDE {
|
|
return isOppositeCond(isNot, isCPP(), expr, tok, getSettings()->library, true, true);
|
|
}
|
|
};
|
|
|
|
static Analyzer::Action valueFlowForwardExpression(Token* startToken,
|
|
const Token* endToken,
|
|
const Token* exprTok,
|
|
const std::list<ValueFlow::Value>& values,
|
|
const TokenList* const tokenlist,
|
|
const Settings* settings)
|
|
{
|
|
Analyzer::Action actions;
|
|
for (const ValueFlow::Value& v : values) {
|
|
ExpressionAnalyzer a(exprTok, v, tokenlist);
|
|
actions |= valueFlowGenericForward(startToken, endToken, a, settings);
|
|
}
|
|
return actions;
|
|
}
|
|
|
|
static const Token* parseBinaryIntOp(const Token* expr, MathLib::bigint& known)
|
|
{
|
|
if (!expr)
|
|
return nullptr;
|
|
if (!expr->astOperand1() || !expr->astOperand2())
|
|
return nullptr;
|
|
const Token* knownTok = nullptr;
|
|
const Token* varTok = nullptr;
|
|
if (expr->astOperand1()->hasKnownIntValue() && !expr->astOperand2()->hasKnownIntValue()) {
|
|
varTok = expr->astOperand2();
|
|
knownTok = expr->astOperand1();
|
|
} else if (expr->astOperand2()->hasKnownIntValue() && !expr->astOperand1()->hasKnownIntValue()) {
|
|
varTok = expr->astOperand1();
|
|
knownTok = expr->astOperand2();
|
|
}
|
|
if (knownTok)
|
|
known = knownTok->values().front().intvalue;
|
|
return varTok;
|
|
}
|
|
|
|
template <class F>
|
|
void transformIntValues(std::list<ValueFlow::Value>& values, F f)
|
|
{
|
|
std::transform(values.begin(), values.end(), values.begin(), [&](ValueFlow::Value x) {
|
|
if (x.isIntValue() || x.isIteratorValue())
|
|
x.intvalue = f(x.intvalue);
|
|
return x;
|
|
});
|
|
}
|
|
|
|
static const Token* solveExprValues(const Token* expr, std::list<ValueFlow::Value>& values)
|
|
{
|
|
MathLib::bigint intval;
|
|
const Token* binaryTok = parseBinaryIntOp(expr, intval);
|
|
if (binaryTok && expr->str().size() == 1) {
|
|
switch (expr->str()[0]) {
|
|
case '+': {
|
|
transformIntValues(values, [&](MathLib::bigint x) {
|
|
return x - intval;
|
|
});
|
|
return solveExprValues(binaryTok, values);
|
|
}
|
|
case '*': {
|
|
if (intval == 0)
|
|
break;
|
|
transformIntValues(values, [&](MathLib::bigint x) {
|
|
return x / intval;
|
|
});
|
|
return solveExprValues(binaryTok, values);
|
|
}
|
|
case '^': {
|
|
transformIntValues(values, [&](MathLib::bigint x) {
|
|
return x ^ intval;
|
|
});
|
|
return solveExprValues(binaryTok, values);
|
|
}
|
|
}
|
|
}
|
|
return expr;
|
|
}
|
|
|
|
ValuePtr<Analyzer> makeAnalyzer(Token* exprTok, const ValueFlow::Value& value, const TokenList* tokenlist)
|
|
{
|
|
std::list<ValueFlow::Value> values = {value};
|
|
const Token* expr = solveExprValues(exprTok, values);
|
|
if (expr->variable()) {
|
|
return VariableAnalyzer(expr->variable(), value, getAliasesFromValues(values), tokenlist);
|
|
} else {
|
|
return ExpressionAnalyzer(expr, value, tokenlist);
|
|
}
|
|
}
|
|
|
|
static Analyzer::Action valueFlowForward(Token* startToken,
|
|
const Token* endToken,
|
|
const Token* exprTok,
|
|
std::list<ValueFlow::Value> values,
|
|
TokenList* const tokenlist,
|
|
const Settings* settings)
|
|
{
|
|
const Token* expr = solveExprValues(exprTok, values);
|
|
if (expr->variable()) {
|
|
return valueFlowForwardVariable(startToken, endToken, expr->variable(), values, tokenlist, settings);
|
|
} else {
|
|
return valueFlowForwardExpression(startToken, endToken, expr, values, tokenlist, settings);
|
|
}
|
|
}
|
|
|
|
static void valueFlowReverse(TokenList* tokenlist,
|
|
Token* tok,
|
|
const Token* const varToken,
|
|
ValueFlow::Value val,
|
|
ValueFlow::Value val2,
|
|
ErrorLogger* /*errorLogger*/,
|
|
const Settings* settings)
|
|
{
|
|
std::list<ValueFlow::Value> values = {val};
|
|
if (val2.varId != 0)
|
|
values.push_back(val2);
|
|
const Variable* var = varToken->variable();
|
|
auto aliases = getAliasesFromValues(values);
|
|
for (ValueFlow::Value& v : values) {
|
|
VariableAnalyzer a(var, v, aliases, tokenlist);
|
|
valueFlowGenericReverse(tok, a, settings);
|
|
}
|
|
}
|
|
|
|
static void valueFlowReverse(Token* tok,
|
|
const Token* const endToken,
|
|
const Token* const varToken,
|
|
const std::list<ValueFlow::Value>& values,
|
|
TokenList* tokenlist,
|
|
const Settings* settings)
|
|
{
|
|
const Variable* var = varToken->variable();
|
|
if (var) {
|
|
auto aliases = getAliasesFromValues(values);
|
|
for (const ValueFlow::Value& v : values) {
|
|
VariableAnalyzer a(var, v, aliases, tokenlist);
|
|
valueFlowGenericReverse(tok, endToken, a, settings);
|
|
}
|
|
} else {
|
|
for (const ValueFlow::Value& v : values) {
|
|
ExpressionAnalyzer a(varToken, v, tokenlist);
|
|
valueFlowGenericReverse(tok, endToken, a, settings);
|
|
}
|
|
}
|
|
}
|
|
|
|
std::string lifetimeType(const Token *tok, const ValueFlow::Value *val)
|
|
{
|
|
std::string result;
|
|
if (!val)
|
|
return "object";
|
|
switch (val->lifetimeKind) {
|
|
case ValueFlow::Value::LifetimeKind::Lambda:
|
|
result = "lambda";
|
|
break;
|
|
case ValueFlow::Value::LifetimeKind::Iterator:
|
|
result = "iterator";
|
|
break;
|
|
case ValueFlow::Value::LifetimeKind::Object:
|
|
case ValueFlow::Value::LifetimeKind::SubObject:
|
|
case ValueFlow::Value::LifetimeKind::Address:
|
|
if (astIsPointer(tok))
|
|
result = "pointer";
|
|
else
|
|
result = "object";
|
|
break;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
std::string lifetimeMessage(const Token *tok, const ValueFlow::Value *val, ErrorPath &errorPath)
|
|
{
|
|
const Token *tokvalue = val ? val->tokvalue : nullptr;
|
|
const Variable *tokvar = tokvalue ? tokvalue->variable() : nullptr;
|
|
const Token *vartok = tokvar ? tokvar->nameToken() : nullptr;
|
|
std::string type = lifetimeType(tok, val);
|
|
std::string msg = type;
|
|
if (vartok) {
|
|
errorPath.emplace_back(vartok, "Variable created here.");
|
|
const Variable * var = vartok->variable();
|
|
if (var) {
|
|
switch (val->lifetimeKind) {
|
|
case ValueFlow::Value::LifetimeKind::SubObject:
|
|
case ValueFlow::Value::LifetimeKind::Object:
|
|
case ValueFlow::Value::LifetimeKind::Address:
|
|
if (type == "pointer")
|
|
msg += " to local variable";
|
|
else
|
|
msg += " that points to local variable";
|
|
break;
|
|
case ValueFlow::Value::LifetimeKind::Lambda:
|
|
msg += " that captures local variable";
|
|
break;
|
|
case ValueFlow::Value::LifetimeKind::Iterator:
|
|
msg += " to local container";
|
|
break;
|
|
}
|
|
msg += " '" + var->name() + "'";
|
|
}
|
|
}
|
|
return msg;
|
|
}
|
|
|
|
std::vector<ValueFlow::Value> getLifetimeObjValues(const Token *tok, bool inconclusive, bool subfunction)
|
|
{
|
|
std::vector<ValueFlow::Value> result;
|
|
auto pred = [&](const ValueFlow::Value &v) {
|
|
if (!v.isLocalLifetimeValue() && !(subfunction && v.isSubFunctionLifetimeValue()))
|
|
return false;
|
|
if (!inconclusive && v.isInconclusive())
|
|
return false;
|
|
if (!v.tokvalue->variable())
|
|
return false;
|
|
return true;
|
|
};
|
|
std::copy_if(tok->values().begin(), tok->values().end(), std::back_inserter(result), pred);
|
|
return result;
|
|
}
|
|
|
|
ValueFlow::Value getLifetimeObjValue(const Token *tok, bool inconclusive)
|
|
{
|
|
std::vector<ValueFlow::Value> values = getLifetimeObjValues(tok, inconclusive, false);
|
|
// There should only be one lifetime
|
|
if (values.size() != 1)
|
|
return ValueFlow::Value{};
|
|
return values.front();
|
|
}
|
|
|
|
std::vector<LifetimeToken> getLifetimeTokens(const Token* tok, bool escape, ValueFlow::Value::ErrorPath errorPath, int depth)
|
|
{
|
|
if (!tok)
|
|
return std::vector<LifetimeToken> {};
|
|
const Variable *var = tok->variable();
|
|
if (depth < 0)
|
|
return {{tok, std::move(errorPath)}};
|
|
if (var && var->declarationId() == tok->varId()) {
|
|
if (var->isReference() || var->isRValueReference()) {
|
|
if (!var->declEndToken())
|
|
return {{tok, true, std::move(errorPath)}};
|
|
if (var->isArgument()) {
|
|
errorPath.emplace_back(var->declEndToken(), "Passed to reference.");
|
|
return {{tok, true, std::move(errorPath)}};
|
|
} else if (Token::simpleMatch(var->declEndToken(), "=")) {
|
|
errorPath.emplace_back(var->declEndToken(), "Assigned to reference.");
|
|
const Token *vartok = var->declEndToken()->astOperand2();
|
|
const bool temporaryDefault = false; //If we can't tell then assume the value is not temporary as this will result in fewer false positives.
|
|
const bool temporary = isTemporary(true, vartok, nullptr, temporaryDefault);
|
|
const bool nonlocal = var->isStatic() || var->isGlobal();
|
|
if (vartok == tok || (nonlocal && temporary) || (!escape && (var->isConst() || var->isRValueReference()) && temporary))
|
|
return {{tok, true, std::move(errorPath)}};
|
|
if (vartok)
|
|
return getLifetimeTokens(vartok, escape, std::move(errorPath), depth - 1);
|
|
} else if (Token::simpleMatch(var->nameToken()->astParent(), ":") &&
|
|
var->nameToken()->astParent()->astParent() &&
|
|
Token::simpleMatch(var->nameToken()->astParent()->astParent()->previous(), "for (")) {
|
|
errorPath.emplace_back(var->nameToken(), "Assigned to reference.");
|
|
const Token* vartok = var->nameToken();
|
|
if (vartok == tok)
|
|
return {{tok, true, std::move(errorPath)}};
|
|
const Token* contok = var->nameToken()->astParent()->astOperand2();
|
|
if (contok)
|
|
return getLifetimeTokens(contok, escape, std::move(errorPath), depth - 1);
|
|
} else {
|
|
return std::vector<LifetimeToken> {};
|
|
}
|
|
}
|
|
} else if (Token::Match(tok->previous(), "%name% (")) {
|
|
const Function *f = tok->previous()->function();
|
|
if (f) {
|
|
if (!Function::returnsReference(f))
|
|
return {{tok, std::move(errorPath)}};
|
|
std::vector<LifetimeToken> result;
|
|
std::vector<const Token*> returns = Function::findReturns(f);
|
|
for (const Token* returnTok : returns) {
|
|
if (returnTok == tok)
|
|
continue;
|
|
for (LifetimeToken& lt : getLifetimeTokens(returnTok, escape, errorPath, depth - 1)) {
|
|
const Token* argvarTok = lt.token;
|
|
const Variable* argvar = argvarTok->variable();
|
|
if (!argvar)
|
|
continue;
|
|
if (argvar->isArgument() && (argvar->isReference() || argvar->isRValueReference())) {
|
|
int n = getArgumentPos(argvar, f);
|
|
if (n < 0)
|
|
return std::vector<LifetimeToken> {};
|
|
std::vector<const Token*> args = getArguments(tok->previous());
|
|
// TODO: Track lifetimes of default parameters
|
|
if (n >= args.size())
|
|
return std::vector<LifetimeToken> {};
|
|
const Token* argTok = args[n];
|
|
lt.errorPath.emplace_back(returnTok, "Return reference.");
|
|
lt.errorPath.emplace_back(tok->previous(), "Called function passing '" + argTok->expressionString() + "'.");
|
|
std::vector<LifetimeToken> arglts = LifetimeToken::setInconclusive(
|
|
getLifetimeTokens(argTok, escape, std::move(lt.errorPath), depth - 1), returns.size() > 1);
|
|
result.insert(result.end(), arglts.begin(), arglts.end());
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
} else if (Token::Match(tok->tokAt(-2), ". %name% (") && tok->tokAt(-2)->originalName() != "->" && astIsContainer(tok->tokAt(-2)->astOperand1())) {
|
|
const Library::Container* library = getLibraryContainer(tok->tokAt(-2)->astOperand1());
|
|
Library::Container::Yield y = library->getYield(tok->previous()->str());
|
|
if (y == Library::Container::Yield::AT_INDEX || y == Library::Container::Yield::ITEM) {
|
|
errorPath.emplace_back(tok->previous(), "Accessing container.");
|
|
return LifetimeToken::setAddressOf(
|
|
getLifetimeTokens(tok->tokAt(-2)->astOperand1(), escape, std::move(errorPath), depth - 1), false);
|
|
}
|
|
}
|
|
} else if (Token::Match(tok, ".|::|[")) {
|
|
const Token *vartok = tok;
|
|
while (vartok) {
|
|
if (vartok->str() == "[" || vartok->originalName() == "->")
|
|
vartok = vartok->astOperand1();
|
|
else if (vartok->str() == "." || vartok->str() == "::")
|
|
vartok = vartok->astOperand2();
|
|
else
|
|
break;
|
|
}
|
|
|
|
if (!vartok)
|
|
return {{tok, std::move(errorPath)}};
|
|
const Variable *tokvar = vartok->variable();
|
|
if (!astIsContainer(vartok) && !(tokvar && tokvar->isArray() && !tokvar->isArgument()) &&
|
|
(Token::Match(vartok->astParent(), "[|*") || vartok->astParent()->originalName() == "->")) {
|
|
for (const ValueFlow::Value &v : vartok->values()) {
|
|
if (!v.isLocalLifetimeValue())
|
|
continue;
|
|
if (v.tokvalue == tok)
|
|
continue;
|
|
errorPath.insert(errorPath.end(), v.errorPath.begin(), v.errorPath.end());
|
|
return getLifetimeTokens(v.tokvalue, escape, std::move(errorPath), depth - 1);
|
|
}
|
|
} else {
|
|
return LifetimeToken::setAddressOf(getLifetimeTokens(vartok, escape, std::move(errorPath), depth - 1),
|
|
!(astIsContainer(vartok) && Token::simpleMatch(vartok->astParent(), "[")));
|
|
}
|
|
}
|
|
return {{tok, std::move(errorPath)}};
|
|
}
|
|
|
|
static const Token* getLifetimeToken(const Token* tok, ValueFlow::Value::ErrorPath& errorPath, bool* addressOf = nullptr)
|
|
{
|
|
std::vector<LifetimeToken> lts = getLifetimeTokens(tok);
|
|
if (lts.size() != 1)
|
|
return nullptr;
|
|
if (lts.front().inconclusive)
|
|
return nullptr;
|
|
if (addressOf)
|
|
*addressOf = lts.front().addressOf;
|
|
errorPath.insert(errorPath.end(), lts.front().errorPath.begin(), lts.front().errorPath.end());
|
|
return lts.front().token;
|
|
}
|
|
|
|
const Variable* getLifetimeVariable(const Token* tok, ValueFlow::Value::ErrorPath& errorPath, bool* addressOf)
|
|
{
|
|
const Token* tok2 = getLifetimeToken(tok, errorPath, addressOf);
|
|
if (tok2 && tok2->variable())
|
|
return tok2->variable();
|
|
return nullptr;
|
|
}
|
|
|
|
const Variable* getLifetimeVariable(const Token* tok)
|
|
{
|
|
ValueFlow::Value::ErrorPath errorPath;
|
|
return getLifetimeVariable(tok, errorPath, nullptr);
|
|
}
|
|
|
|
static bool isNotLifetimeValue(const ValueFlow::Value& val)
|
|
{
|
|
return !val.isLifetimeValue();
|
|
}
|
|
|
|
static bool isLifetimeOwned(const ValueType *vt, const ValueType *vtParent)
|
|
{
|
|
if (!vtParent)
|
|
return false;
|
|
if (!vt) {
|
|
if (vtParent->type == ValueType::CONTAINER)
|
|
return true;
|
|
return false;
|
|
}
|
|
if (vt->type != ValueType::UNKNOWN_TYPE && vtParent->type != ValueType::UNKNOWN_TYPE) {
|
|
if (vt->pointer != vtParent->pointer)
|
|
return true;
|
|
if (vt->type != vtParent->type) {
|
|
if (vtParent->type == ValueType::RECORD)
|
|
return true;
|
|
if (vtParent->type == ValueType::CONTAINER)
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool isLifetimeBorrowed(const ValueType *vt, const ValueType *vtParent)
|
|
{
|
|
if (!vtParent)
|
|
return false;
|
|
if (!vt)
|
|
return false;
|
|
if (vt->type != ValueType::UNKNOWN_TYPE && vtParent->type != ValueType::UNKNOWN_TYPE && vtParent->container == vt->container) {
|
|
if (vtParent->pointer > vt->pointer)
|
|
return true;
|
|
if (vtParent->pointer < vt->pointer && vtParent->isIntegral())
|
|
return true;
|
|
if (vtParent->str() == vt->str())
|
|
return true;
|
|
if (vtParent->pointer == vt->pointer && vtParent->type == vt->type && vtParent->isIntegral())
|
|
// sign conversion
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static const Token* skipCVRefs(const Token* tok, const Token* endTok)
|
|
{
|
|
while (tok != endTok && Token::Match(tok, "const|volatile|auto|&|&&"))
|
|
tok = tok->next();
|
|
return tok;
|
|
}
|
|
|
|
static bool isNotEqual(std::pair<const Token*, const Token*> x, std::pair<const Token*, const Token*> y)
|
|
{
|
|
const Token* start1 = x.first;
|
|
const Token* start2 = y.first;
|
|
if (start1 == nullptr || start2 == nullptr)
|
|
return false;
|
|
while (start1 != x.second && start2 != y.second) {
|
|
const Token* tok1 = skipCVRefs(start1, x.second);
|
|
if (tok1 != start1) {
|
|
start1 = tok1;
|
|
continue;
|
|
}
|
|
const Token* tok2 = skipCVRefs(start2, y.second);
|
|
if (tok2 != start2) {
|
|
start2 = tok2;
|
|
continue;
|
|
}
|
|
if (start1->str() != start2->str())
|
|
return true;
|
|
start1 = start1->next();
|
|
start2 = start2->next();
|
|
}
|
|
start1 = skipCVRefs(start1, x.second);
|
|
start2 = skipCVRefs(start2, y.second);
|
|
return !(start1 == x.second && start2 == y.second);
|
|
}
|
|
static bool isNotEqual(std::pair<const Token*, const Token*> x, const std::string& y)
|
|
{
|
|
TokenList tokenList(nullptr);
|
|
std::istringstream istr(y);
|
|
tokenList.createTokens(istr);
|
|
return isNotEqual(x, std::make_pair(tokenList.front(), tokenList.back()));
|
|
}
|
|
static bool isNotEqual(std::pair<const Token*, const Token*> x, const ValueType* y)
|
|
{
|
|
if (y == nullptr)
|
|
return false;
|
|
if (y->originalTypeName.empty())
|
|
return false;
|
|
return isNotEqual(x, y->originalTypeName);
|
|
}
|
|
|
|
bool isLifetimeBorrowed(const Token *tok, const Settings *settings)
|
|
{
|
|
if (!tok)
|
|
return true;
|
|
if (tok->str() == ",")
|
|
return true;
|
|
if (!tok->astParent())
|
|
return true;
|
|
if (!Token::Match(tok->astParent()->previous(), "%name% (") && !Token::simpleMatch(tok->astParent(), ",")) {
|
|
if (!Token::simpleMatch(tok, "{")) {
|
|
const ValueType *vt = tok->valueType();
|
|
const ValueType *vtParent = tok->astParent()->valueType();
|
|
if (isLifetimeBorrowed(vt, vtParent))
|
|
return true;
|
|
if (isLifetimeOwned(vt, vtParent))
|
|
return false;
|
|
}
|
|
if (Token::Match(tok->astParent(), "return|(|{|%assign%")) {
|
|
const Type *t = Token::typeOf(tok);
|
|
const Type *parentT = Token::typeOf(tok->astParent());
|
|
if (t && parentT) {
|
|
if (t->classDef && parentT->classDef && t->classDef != parentT->classDef)
|
|
return false;
|
|
} else {
|
|
std::pair<const Token*, const Token*> decl = Token::typeDecl(tok);
|
|
std::pair<const Token*, const Token*> parentdecl = Token::typeDecl(tok->astParent());
|
|
if (isNotEqual(decl, parentdecl))
|
|
return false;
|
|
if (isNotEqual(decl, tok->astParent()->valueType()))
|
|
return false;
|
|
if (isNotEqual(parentdecl, tok->valueType()))
|
|
return false;
|
|
}
|
|
}
|
|
} else if (Token::Match(tok->astParent()->tokAt(-3), "%var% . push_back|push_front|insert|push (") &&
|
|
astIsContainer(tok->astParent()->tokAt(-3))) {
|
|
const ValueType *vt = tok->valueType();
|
|
const ValueType *vtCont = tok->astParent()->tokAt(-3)->valueType();
|
|
if (!vtCont->containerTypeToken)
|
|
return true;
|
|
ValueType vtParent = ValueType::parseDecl(vtCont->containerTypeToken, settings);
|
|
if (isLifetimeBorrowed(vt, &vtParent))
|
|
return true;
|
|
if (isLifetimeOwned(vt, &vtParent))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static void valueFlowLifetimeFunction(Token *tok, TokenList *tokenlist, ErrorLogger *errorLogger, const Settings *settings);
|
|
|
|
static void valueFlowLifetimeConstructor(Token *tok,
|
|
TokenList *tokenlist,
|
|
ErrorLogger *errorLogger,
|
|
const Settings *settings);
|
|
|
|
static const Token* getEndOfVarScope(const Token* tok, const std::vector<const Variable*>& vars)
|
|
{
|
|
const Token* endOfVarScope = nullptr;
|
|
for (const Variable* var : vars) {
|
|
if (var && (var->isLocal() || var->isArgument()))
|
|
endOfVarScope = var->typeStartToken()->scope()->bodyEnd;
|
|
else if (!endOfVarScope)
|
|
endOfVarScope = tok->scope()->bodyEnd;
|
|
}
|
|
return endOfVarScope;
|
|
}
|
|
|
|
static void valueFlowForwardLifetime(Token * tok, TokenList *tokenlist, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
// Forward lifetimes to constructed variable
|
|
if (Token::Match(tok->previous(), "%var% {")) {
|
|
std::list<ValueFlow::Value> values = tok->values();
|
|
values.remove_if(&isNotLifetimeValue);
|
|
valueFlowForward(nextAfterAstRightmostLeaf(tok),
|
|
getEndOfVarScope(tok, {tok->variable()}),
|
|
tok->previous(),
|
|
values,
|
|
tokenlist,
|
|
settings);
|
|
return;
|
|
}
|
|
Token *parent = tok->astParent();
|
|
while (parent && (parent->isArithmeticalOp() || parent->str() == ","))
|
|
parent = parent->astParent();
|
|
if (!parent)
|
|
return;
|
|
// Assignment
|
|
if (parent->str() == "=" && (!parent->astParent() || Token::simpleMatch(parent->astParent(), ";"))) {
|
|
// Rhs values..
|
|
if (!parent->astOperand2() || parent->astOperand2()->values().empty())
|
|
return;
|
|
|
|
if (!isLifetimeBorrowed(parent->astOperand2(), settings))
|
|
return;
|
|
|
|
std::vector<const Variable*> vars = getLHSVariables(parent);
|
|
|
|
const Token* endOfVarScope = getEndOfVarScope(tok, vars);
|
|
|
|
// Only forward lifetime values
|
|
std::list<ValueFlow::Value> values = parent->astOperand2()->values();
|
|
values.remove_if(&isNotLifetimeValue);
|
|
|
|
// Skip RHS
|
|
const Token *nextExpression = nextAfterAstRightmostLeaf(parent);
|
|
|
|
if (Token::Match(parent->astOperand1(), ".|[|(")) {
|
|
valueFlowForwardExpression(
|
|
const_cast<Token*>(nextExpression), endOfVarScope, parent->astOperand1(), values, tokenlist, settings);
|
|
|
|
for (ValueFlow::Value& val : values) {
|
|
if (val.lifetimeKind == ValueFlow::Value::LifetimeKind::Address)
|
|
val.lifetimeKind = ValueFlow::Value::LifetimeKind::SubObject;
|
|
}
|
|
}
|
|
for (const Variable* var : vars) {
|
|
valueFlowForwardVariable(const_cast<Token*>(nextExpression),
|
|
endOfVarScope,
|
|
var,
|
|
var->declarationId(),
|
|
values,
|
|
false,
|
|
false,
|
|
tokenlist,
|
|
errorLogger,
|
|
settings);
|
|
|
|
if (tok->astTop() && Token::simpleMatch(tok->astTop()->previous(), "for (") &&
|
|
Token::simpleMatch(tok->astTop()->link(), ") {")) {
|
|
Token* start = tok->astTop()->link()->next();
|
|
valueFlowForwardVariable(
|
|
start, start->link(), var, var->declarationId(), values, false, false, tokenlist, errorLogger, settings);
|
|
}
|
|
}
|
|
// Constructor
|
|
} else if (Token::simpleMatch(parent, "{") && !isScopeBracket(parent)) {
|
|
valueFlowLifetimeConstructor(parent, tokenlist, errorLogger, settings);
|
|
valueFlowForwardLifetime(parent, tokenlist, errorLogger, settings);
|
|
// Function call
|
|
} else if (Token::Match(parent->previous(), "%name% (")) {
|
|
valueFlowLifetimeFunction(parent->previous(), tokenlist, errorLogger, settings);
|
|
valueFlowForwardLifetime(parent, tokenlist, errorLogger, settings);
|
|
// Variable
|
|
} else if (tok->variable()) {
|
|
const Variable *var = tok->variable();
|
|
const Token *endOfVarScope = var->scope()->bodyEnd;
|
|
|
|
std::list<ValueFlow::Value> values = tok->values();
|
|
const Token *nextExpression = nextAfterAstRightmostLeaf(parent);
|
|
// Only forward lifetime values
|
|
values.remove_if(&isNotLifetimeValue);
|
|
valueFlowForwardVariable(const_cast<Token*>(nextExpression),
|
|
endOfVarScope,
|
|
var,
|
|
var->declarationId(),
|
|
values,
|
|
false,
|
|
false,
|
|
tokenlist,
|
|
errorLogger,
|
|
settings);
|
|
// Cast
|
|
} else if (parent->isCast()) {
|
|
std::list<ValueFlow::Value> values = tok->values();
|
|
// Only forward lifetime values
|
|
values.remove_if(&isNotLifetimeValue);
|
|
for (const ValueFlow::Value& value:values)
|
|
setTokenValue(parent, value, tokenlist->getSettings());
|
|
valueFlowForwardLifetime(parent, tokenlist, errorLogger, settings);
|
|
}
|
|
}
|
|
|
|
struct LifetimeStore {
|
|
const Token *argtok;
|
|
std::string message;
|
|
ValueFlow::Value::LifetimeKind type;
|
|
ErrorPath errorPath;
|
|
bool inconclusive;
|
|
bool forward;
|
|
|
|
struct Context {
|
|
Token* tok;
|
|
TokenList* tokenlist;
|
|
ErrorLogger* errorLogger;
|
|
const Settings* settings;
|
|
};
|
|
|
|
LifetimeStore()
|
|
: argtok(nullptr), message(), type(), errorPath(), inconclusive(false), forward(true), mContext(nullptr)
|
|
{}
|
|
|
|
LifetimeStore(const Token* argtok,
|
|
const std::string& message,
|
|
ValueFlow::Value::LifetimeKind type = ValueFlow::Value::LifetimeKind::Object,
|
|
bool inconclusive = false)
|
|
: argtok(argtok),
|
|
message(message),
|
|
type(type),
|
|
errorPath(),
|
|
inconclusive(inconclusive),
|
|
forward(true),
|
|
mContext(nullptr)
|
|
{}
|
|
|
|
template <class F>
|
|
static void forEach(const std::vector<const Token*>& argtoks,
|
|
const std::string& message,
|
|
ValueFlow::Value::LifetimeKind type,
|
|
F f) {
|
|
std::map<const Token*, Context> forwardToks;
|
|
for (const Token* arg : argtoks) {
|
|
LifetimeStore ls{arg, message, type};
|
|
Context c{};
|
|
ls.mContext = &c;
|
|
ls.forward = false;
|
|
f(ls);
|
|
if (c.tok)
|
|
forwardToks[c.tok] = c;
|
|
}
|
|
for (const auto& p : forwardToks) {
|
|
const Context& c = p.second;
|
|
valueFlowForwardLifetime(c.tok, c.tokenlist, c.errorLogger, c.settings);
|
|
}
|
|
}
|
|
|
|
static LifetimeStore fromFunctionArg(const Function * f, Token *tok, const Variable *var, TokenList *tokenlist, ErrorLogger *errorLogger) {
|
|
if (!var)
|
|
return LifetimeStore{};
|
|
if (!var->isArgument())
|
|
return LifetimeStore{};
|
|
int n = getArgumentPos(var, f);
|
|
if (n < 0)
|
|
return LifetimeStore{};
|
|
std::vector<const Token *> args = getArguments(tok);
|
|
if (n >= args.size()) {
|
|
if (tokenlist->getSettings()->debugwarnings)
|
|
bailout(tokenlist,
|
|
errorLogger,
|
|
tok,
|
|
"Argument mismatch: Function '" + tok->str() + "' returning lifetime from argument index " +
|
|
std::to_string(n) + " but only " + std::to_string(args.size()) +
|
|
" arguments are available.");
|
|
return LifetimeStore{};
|
|
}
|
|
const Token *argtok2 = args[n];
|
|
return LifetimeStore{argtok2, "Passed to '" + tok->expressionString() + "'.", ValueFlow::Value::LifetimeKind::Object};
|
|
}
|
|
|
|
template <class Predicate>
|
|
bool byRef(Token* tok, TokenList* tokenlist, ErrorLogger* errorLogger, const Settings* settings, Predicate pred) const {
|
|
if (!argtok)
|
|
return false;
|
|
bool update = false;
|
|
for (const LifetimeToken& lt : getLifetimeTokens(argtok)) {
|
|
if (!settings->inconclusive && lt.inconclusive)
|
|
continue;
|
|
ErrorPath er = errorPath;
|
|
er.insert(er.end(), lt.errorPath.begin(), lt.errorPath.end());
|
|
if (!lt.token)
|
|
return false;
|
|
if (!pred(lt.token))
|
|
return false;
|
|
er.emplace_back(argtok, message);
|
|
|
|
ValueFlow::Value value;
|
|
value.valueType = ValueFlow::Value::ValueType::LIFETIME;
|
|
value.lifetimeScope = ValueFlow::Value::LifetimeScope::Local;
|
|
value.tokvalue = lt.token;
|
|
value.errorPath = std::move(er);
|
|
value.lifetimeKind = type;
|
|
value.setInconclusive(lt.inconclusive || inconclusive);
|
|
// Don't add the value a second time
|
|
if (std::find(tok->values().begin(), tok->values().end(), value) != tok->values().end())
|
|
return false;
|
|
setTokenValue(tok, value, tokenlist->getSettings());
|
|
update = true;
|
|
}
|
|
if (update && forward)
|
|
forwardLifetime(tok, tokenlist, errorLogger, settings);
|
|
return update;
|
|
}
|
|
|
|
bool byRef(Token* tok, TokenList* tokenlist, ErrorLogger* errorLogger, const Settings* settings) const {
|
|
return byRef(tok, tokenlist, errorLogger, settings, [](const Token*) {
|
|
return true;
|
|
});
|
|
}
|
|
|
|
template <class Predicate>
|
|
bool byVal(Token* tok, TokenList* tokenlist, ErrorLogger* errorLogger, const Settings* settings, Predicate pred) const {
|
|
if (!argtok)
|
|
return false;
|
|
bool update = false;
|
|
if (argtok->values().empty()) {
|
|
ErrorPath er;
|
|
er.emplace_back(argtok, message);
|
|
const Variable *var = getLifetimeVariable(argtok, er);
|
|
if (var && var->isArgument()) {
|
|
ValueFlow::Value value;
|
|
value.valueType = ValueFlow::Value::ValueType::LIFETIME;
|
|
value.lifetimeScope = ValueFlow::Value::LifetimeScope::Argument;
|
|
value.tokvalue = var->nameToken();
|
|
value.errorPath = er;
|
|
value.lifetimeKind = type;
|
|
value.setInconclusive(inconclusive);
|
|
// Don't add the value a second time
|
|
if (std::find(tok->values().begin(), tok->values().end(), value) != tok->values().end())
|
|
return false;
|
|
setTokenValue(tok, value, tokenlist->getSettings());
|
|
update = true;
|
|
}
|
|
}
|
|
for (const ValueFlow::Value &v : argtok->values()) {
|
|
if (!v.isLifetimeValue())
|
|
continue;
|
|
const Token *tok3 = v.tokvalue;
|
|
for (const LifetimeToken& lt : getLifetimeTokens(tok3)) {
|
|
if (!settings->inconclusive && lt.inconclusive)
|
|
continue;
|
|
ErrorPath er = v.errorPath;
|
|
er.insert(er.end(), lt.errorPath.begin(), lt.errorPath.end());
|
|
if (!lt.token)
|
|
return false;
|
|
if (!pred(lt.token))
|
|
return false;
|
|
er.emplace_back(argtok, message);
|
|
er.insert(er.end(), errorPath.begin(), errorPath.end());
|
|
|
|
ValueFlow::Value value;
|
|
value.valueType = ValueFlow::Value::ValueType::LIFETIME;
|
|
value.lifetimeScope = v.lifetimeScope;
|
|
value.path = v.path;
|
|
value.tokvalue = lt.token;
|
|
value.errorPath = std::move(er);
|
|
value.lifetimeKind = type;
|
|
value.setInconclusive(lt.inconclusive || v.isInconclusive() || inconclusive);
|
|
// Don't add the value a second time
|
|
if (std::find(tok->values().begin(), tok->values().end(), value) != tok->values().end())
|
|
continue;
|
|
setTokenValue(tok, value, tokenlist->getSettings());
|
|
update = true;
|
|
}
|
|
}
|
|
if (update && forward)
|
|
forwardLifetime(tok, tokenlist, errorLogger, settings);
|
|
return update;
|
|
}
|
|
|
|
bool byVal(Token* tok, TokenList* tokenlist, ErrorLogger* errorLogger, const Settings* settings) const {
|
|
return byVal(tok, tokenlist, errorLogger, settings, [](const Token*) {
|
|
return true;
|
|
});
|
|
}
|
|
|
|
template <class Predicate>
|
|
void byDerefCopy(Token *tok, TokenList *tokenlist, ErrorLogger *errorLogger, const Settings *settings, Predicate pred) const {
|
|
if (!settings->inconclusive && inconclusive)
|
|
return;
|
|
if (!argtok)
|
|
return;
|
|
for (const ValueFlow::Value &v : argtok->values()) {
|
|
if (!v.isLifetimeValue())
|
|
continue;
|
|
const Token *tok2 = v.tokvalue;
|
|
ErrorPath er = v.errorPath;
|
|
const Variable *var = getLifetimeVariable(tok2, er);
|
|
er.insert(er.end(), errorPath.begin(), errorPath.end());
|
|
if (!var)
|
|
continue;
|
|
for (const Token *tok3 = tok; tok3 && tok3 != var->declEndToken(); tok3 = tok3->previous()) {
|
|
if (tok3->varId() == var->declarationId()) {
|
|
LifetimeStore{tok3, message, type, inconclusive} .byVal(tok, tokenlist, errorLogger, settings, pred);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void byDerefCopy(Token *tok, TokenList *tokenlist, ErrorLogger *errorLogger, const Settings *settings) const {
|
|
byDerefCopy(tok, tokenlist, errorLogger, settings, [](const Token *) {
|
|
return true;
|
|
});
|
|
}
|
|
|
|
private:
|
|
Context* mContext;
|
|
void forwardLifetime(Token* tok, TokenList* tokenlist, ErrorLogger* errorLogger, const Settings* settings) const {
|
|
if (mContext) {
|
|
mContext->tok = tok;
|
|
mContext->tokenlist = tokenlist;
|
|
mContext->errorLogger = errorLogger;
|
|
mContext->settings = settings;
|
|
}
|
|
valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
|
|
}
|
|
};
|
|
|
|
static void valueFlowLifetimeFunction(Token *tok, TokenList *tokenlist, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
if (!Token::Match(tok, "%name% ("))
|
|
return;
|
|
int returnContainer = settings->library.returnValueContainer(tok);
|
|
if (returnContainer >= 0) {
|
|
std::vector<const Token *> args = getArguments(tok);
|
|
for (int argnr = 1; argnr <= args.size(); ++argnr) {
|
|
const Library::ArgumentChecks::IteratorInfo *i = settings->library.getArgIteratorInfo(tok, argnr);
|
|
if (!i)
|
|
continue;
|
|
if (i->container != returnContainer)
|
|
continue;
|
|
const Token * const argTok = args[argnr - 1];
|
|
// Check if lifetime is available to avoid adding the lifetime twice
|
|
ValueFlow::Value val = getLifetimeObjValue(argTok);
|
|
if (val.tokvalue) {
|
|
LifetimeStore{argTok, "Passed to '" + tok->str() + "'.", ValueFlow::Value::LifetimeKind::Iterator} .byVal(
|
|
tok->next(), tokenlist, errorLogger, settings);
|
|
break;
|
|
}
|
|
}
|
|
} else if (Token::Match(tok->tokAt(-2), "std :: ref|cref|tie|front_inserter|back_inserter")) {
|
|
for (const Token *argtok : getArguments(tok)) {
|
|
LifetimeStore{argtok, "Passed to '" + tok->str() + "'.", ValueFlow::Value::LifetimeKind::Object} .byRef(
|
|
tok->next(), tokenlist, errorLogger, settings);
|
|
}
|
|
} else if (Token::Match(tok->tokAt(-2), "std :: make_tuple|tuple_cat|make_pair|make_reverse_iterator|next|prev|move|bind")) {
|
|
for (const Token *argtok : getArguments(tok)) {
|
|
LifetimeStore{argtok, "Passed to '" + tok->str() + "'.", ValueFlow::Value::LifetimeKind::Object} .byVal(
|
|
tok->next(), tokenlist, errorLogger, settings);
|
|
}
|
|
} else if (Token::Match(tok->tokAt(-2), "%var% . push_back|push_front|insert|push|assign") &&
|
|
astIsContainer(tok->tokAt(-2))) {
|
|
Token *vartok = tok->tokAt(-2);
|
|
std::vector<const Token *> args = getArguments(tok);
|
|
std::size_t n = args.size();
|
|
if (n > 1 && Token::typeStr(args[n - 2]) == Token::typeStr(args[n - 1]) &&
|
|
(((astIsIterator(args[n - 2]) && astIsIterator(args[n - 1])) ||
|
|
(astIsPointer(args[n - 2]) && astIsPointer(args[n - 1]))))) {
|
|
LifetimeStore{args.back(), "Added to container '" + vartok->str() + "'.", ValueFlow::Value::LifetimeKind::Object} .byDerefCopy(
|
|
vartok, tokenlist, errorLogger, settings);
|
|
} else if (!args.empty() && isLifetimeBorrowed(args.back(), settings)) {
|
|
LifetimeStore{args.back(), "Added to container '" + vartok->str() + "'.", ValueFlow::Value::LifetimeKind::Object} .byVal(
|
|
vartok, tokenlist, errorLogger, settings);
|
|
}
|
|
} else if (tok->function()) {
|
|
const Function *f = tok->function();
|
|
if (Function::returnsReference(f))
|
|
return;
|
|
std::vector<const Token*> returns = Function::findReturns(f);
|
|
const bool inconclusive = returns.size() > 1;
|
|
bool update = false;
|
|
for (const Token* returnTok : returns) {
|
|
if (returnTok == tok)
|
|
continue;
|
|
const Variable *returnVar = getLifetimeVariable(returnTok);
|
|
if (returnVar && returnVar->isArgument() && (returnVar->isConst() || !isVariableChanged(returnVar, settings, tokenlist->isCPP()))) {
|
|
LifetimeStore ls = LifetimeStore::fromFunctionArg(f, tok, returnVar, tokenlist, errorLogger);
|
|
ls.inconclusive = inconclusive;
|
|
ls.forward = false;
|
|
update |= ls.byVal(tok->next(), tokenlist, errorLogger, settings);
|
|
}
|
|
for (const ValueFlow::Value &v : returnTok->values()) {
|
|
if (!v.isLifetimeValue())
|
|
continue;
|
|
if (!v.tokvalue)
|
|
continue;
|
|
const Variable *var = v.tokvalue->variable();
|
|
LifetimeStore ls = LifetimeStore::fromFunctionArg(f, tok, var, tokenlist, errorLogger);
|
|
if (!ls.argtok)
|
|
continue;
|
|
ls.forward = false;
|
|
ls.inconclusive = inconclusive;
|
|
ls.errorPath = v.errorPath;
|
|
ls.errorPath.emplace_front(returnTok, "Return " + lifetimeType(returnTok, &v) + ".");
|
|
if (!v.isArgumentLifetimeValue() && (var->isReference() || var->isRValueReference())) {
|
|
update |= ls.byRef(tok->next(), tokenlist, errorLogger, settings);
|
|
} else if (v.isArgumentLifetimeValue()) {
|
|
update |= ls.byVal(tok->next(), tokenlist, errorLogger, settings);
|
|
}
|
|
}
|
|
}
|
|
if (update)
|
|
valueFlowForwardLifetime(tok->next(), tokenlist, errorLogger, settings);
|
|
}
|
|
}
|
|
|
|
static void valueFlowLifetimeConstructor(Token* tok,
|
|
const Type* t,
|
|
TokenList* tokenlist,
|
|
ErrorLogger* errorLogger,
|
|
const Settings* settings)
|
|
{
|
|
if (!Token::Match(tok, "(|{"))
|
|
return;
|
|
if (!t) {
|
|
if (tok->valueType() && tok->valueType()->type != ValueType::RECORD)
|
|
return;
|
|
// If the type is unknown then assume it captures by value in the
|
|
// constructor, but make each lifetime inconclusive
|
|
std::vector<const Token*> args = getArguments(tok);
|
|
LifetimeStore::forEach(
|
|
args, "Passed to initializer list.", ValueFlow::Value::LifetimeKind::Object, [&](LifetimeStore& ls) {
|
|
ls.inconclusive = true;
|
|
ls.byVal(tok, tokenlist, errorLogger, settings);
|
|
});
|
|
return;
|
|
}
|
|
const Scope* scope = t->classScope;
|
|
if (!scope)
|
|
return;
|
|
// Only support aggregate constructors for now
|
|
if (scope->numConstructors == 0 && t->derivedFrom.empty() && (t->isClassType() || t->isStructType())) {
|
|
std::vector<const Token*> args = getArguments(tok);
|
|
auto it = scope->varlist.begin();
|
|
LifetimeStore::forEach(args,
|
|
"Passed to constructor of '" + t->name() + "'.",
|
|
ValueFlow::Value::LifetimeKind::Object,
|
|
[&](const LifetimeStore& ls) {
|
|
if (it == scope->varlist.end())
|
|
return;
|
|
const Variable& var = *it;
|
|
if (var.isReference() || var.isRValueReference()) {
|
|
ls.byRef(tok, tokenlist, errorLogger, settings);
|
|
} else {
|
|
ls.byVal(tok, tokenlist, errorLogger, settings);
|
|
}
|
|
it++;
|
|
});
|
|
}
|
|
}
|
|
|
|
static bool hasInitList(const Token* tok)
|
|
{
|
|
if (astIsPointer(tok))
|
|
return true;
|
|
if (astIsContainer(tok)) {
|
|
const Library::Container * library = getLibraryContainer(tok);
|
|
if (!library)
|
|
return false;
|
|
return library->hasInitializerListConstructor;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void valueFlowLifetimeConstructor(Token* tok, TokenList* tokenlist, ErrorLogger* errorLogger, const Settings* settings)
|
|
{
|
|
if (!Token::Match(tok, "(|{"))
|
|
return;
|
|
Token* parent = tok->astParent();
|
|
while (Token::simpleMatch(parent, ","))
|
|
parent = parent->astParent();
|
|
if (Token::simpleMatch(parent, "{") && hasInitList(parent->astParent())) {
|
|
valueFlowLifetimeConstructor(tok, Token::typeOf(parent->previous()), tokenlist, errorLogger, settings);
|
|
} else if (Token::simpleMatch(tok, "{") && hasInitList(parent)) {
|
|
std::vector<const Token *> args = getArguments(tok);
|
|
// Assume range constructor if passed a pair of iterators
|
|
if (astIsContainer(parent) && args.size() == 2 && astIsIterator(args[0]) && astIsIterator(args[1])) {
|
|
LifetimeStore::forEach(
|
|
args, "Passed to initializer list.", ValueFlow::Value::LifetimeKind::Object, [&](const LifetimeStore& ls) {
|
|
ls.byDerefCopy(tok, tokenlist, errorLogger, settings);
|
|
});
|
|
} else {
|
|
LifetimeStore::forEach(args,
|
|
"Passed to initializer list.",
|
|
ValueFlow::Value::LifetimeKind::Object,
|
|
[&](const LifetimeStore& ls) {
|
|
ls.byVal(tok, tokenlist, errorLogger, settings);
|
|
});
|
|
}
|
|
} else {
|
|
valueFlowLifetimeConstructor(tok, Token::typeOf(tok->previous()), tokenlist, errorLogger, settings);
|
|
}
|
|
}
|
|
|
|
struct Lambda {
|
|
enum class Capture {
|
|
Undefined,
|
|
ByValue,
|
|
ByReference
|
|
};
|
|
explicit Lambda(const Token * tok)
|
|
: capture(nullptr), arguments(nullptr), returnTok(nullptr), bodyTok(nullptr), explicitCaptures(), implicitCapture(Capture::Undefined) {
|
|
if (!Token::simpleMatch(tok, "[") || !tok->link())
|
|
return;
|
|
capture = tok;
|
|
|
|
if (Token::simpleMatch(capture->link(), "] (")) {
|
|
arguments = capture->link()->next();
|
|
}
|
|
const Token * afterArguments = arguments ? arguments->link()->next() : capture->link()->next();
|
|
if (afterArguments && afterArguments->originalName() == "->") {
|
|
returnTok = afterArguments->next();
|
|
bodyTok = Token::findsimplematch(returnTok, "{");
|
|
} else if (Token::simpleMatch(afterArguments, "{")) {
|
|
bodyTok = afterArguments;
|
|
}
|
|
for (const Token* c:getCaptures()) {
|
|
if (c->variable()) {
|
|
explicitCaptures[c->variable()] = std::make_pair(c, Capture::ByValue);
|
|
} else if (c->isUnaryOp("&") && Token::Match(c->astOperand1(), "%var%")) {
|
|
explicitCaptures[c->astOperand1()->variable()] = std::make_pair(c->astOperand1(), Capture::ByReference);
|
|
} else {
|
|
const std::string& s = c->expressionString();
|
|
if (s == "=")
|
|
implicitCapture = Capture::ByValue;
|
|
else if (s == "&")
|
|
implicitCapture = Capture::ByReference;
|
|
}
|
|
}
|
|
}
|
|
|
|
const Token * capture;
|
|
const Token * arguments;
|
|
const Token * returnTok;
|
|
const Token * bodyTok;
|
|
std::unordered_map<const Variable*, std::pair<const Token*, Capture>> explicitCaptures;
|
|
Capture implicitCapture;
|
|
|
|
std::vector<const Token*> getCaptures() {
|
|
return getArguments(capture);
|
|
}
|
|
|
|
bool isLambda() const {
|
|
return capture && bodyTok;
|
|
}
|
|
};
|
|
|
|
static bool isDecayedPointer(const Token *tok)
|
|
{
|
|
if (!tok)
|
|
return false;
|
|
if (!tok->astParent())
|
|
return false;
|
|
if (astIsPointer(tok->astParent()) && !Token::simpleMatch(tok->astParent(), "return"))
|
|
return true;
|
|
if (tok->astParent()->isConstOp())
|
|
return true;
|
|
if (!Token::simpleMatch(tok->astParent(), "return"))
|
|
return false;
|
|
return astIsPointer(tok->astParent());
|
|
}
|
|
|
|
static void valueFlowLifetime(TokenList *tokenlist, SymbolDatabase*, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (!tok->scope())
|
|
continue;
|
|
if (tok->scope()->type == Scope::eGlobal)
|
|
continue;
|
|
Lambda lam(tok);
|
|
// Lamdas
|
|
if (lam.isLambda()) {
|
|
const Scope * bodyScope = lam.bodyTok->scope();
|
|
|
|
std::set<const Scope *> scopes;
|
|
// Avoid capturing a variable twice
|
|
std::set<nonneg int> varids;
|
|
|
|
auto isImplicitCapturingVariable = [&](const Token *varTok) {
|
|
const Variable *var = varTok->variable();
|
|
if (!var)
|
|
return false;
|
|
if (varids.count(var->declarationId()) > 0)
|
|
return false;
|
|
if (!var->isLocal() && !var->isArgument())
|
|
return false;
|
|
const Scope *scope = var->scope();
|
|
if (!scope)
|
|
return false;
|
|
if (scopes.count(scope) > 0)
|
|
return false;
|
|
if (scope->isNestedIn(bodyScope))
|
|
return false;
|
|
scopes.insert(scope);
|
|
varids.insert(var->declarationId());
|
|
return true;
|
|
};
|
|
|
|
bool update = false;
|
|
auto captureVariable = [&](const Token* tok2, Lambda::Capture c, std::function<bool(const Token*)> pred) {
|
|
if (varids.count(tok->varId()) > 0)
|
|
return;
|
|
ErrorPath errorPath;
|
|
if (c == Lambda::Capture::ByReference) {
|
|
LifetimeStore ls{
|
|
tok2, "Lambda captures variable by reference here.", ValueFlow::Value::LifetimeKind::Lambda};
|
|
ls.forward = false;
|
|
update |= ls.byRef(tok, tokenlist, errorLogger, settings, pred);
|
|
} else if (c == Lambda::Capture::ByValue) {
|
|
LifetimeStore ls{
|
|
tok2, "Lambda captures variable by value here.", ValueFlow::Value::LifetimeKind::Lambda};
|
|
ls.forward = false;
|
|
update |= ls.byVal(tok, tokenlist, errorLogger, settings, pred);
|
|
}
|
|
};
|
|
|
|
// Handle explicit capture
|
|
for (const auto& p:lam.explicitCaptures) {
|
|
const Variable* var = p.first;
|
|
if (!var)
|
|
continue;
|
|
const Token* tok2 = p.second.first;
|
|
Lambda::Capture c = p.second.second;
|
|
captureVariable(tok2, c, [](const Token*) {
|
|
return true;
|
|
});
|
|
varids.insert(var->declarationId());
|
|
}
|
|
|
|
for (const Token * tok2 = lam.bodyTok; tok2 != lam.bodyTok->link(); tok2 = tok2->next()) {
|
|
if (!tok2->variable())
|
|
continue;
|
|
captureVariable(tok2, lam.implicitCapture, isImplicitCapturingVariable);
|
|
}
|
|
if (update)
|
|
valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
|
|
}
|
|
// address of
|
|
else if (tok->isUnaryOp("&")) {
|
|
for (const LifetimeToken& lt : getLifetimeTokens(tok->astOperand1())) {
|
|
if (!settings->inconclusive && lt.inconclusive)
|
|
continue;
|
|
ErrorPath errorPath = lt.errorPath;
|
|
errorPath.emplace_back(tok, "Address of variable taken here.");
|
|
|
|
ValueFlow::Value value;
|
|
value.valueType = ValueFlow::Value::ValueType::LIFETIME;
|
|
value.lifetimeScope = ValueFlow::Value::LifetimeScope::Local;
|
|
value.tokvalue = lt.token;
|
|
value.errorPath = std::move(errorPath);
|
|
if (lt.addressOf || astIsPointer(lt.token) || !Token::Match(lt.token->astParent(), ".|["))
|
|
value.lifetimeKind = ValueFlow::Value::LifetimeKind::Address;
|
|
value.setInconclusive(lt.inconclusive);
|
|
setTokenValue(tok, value, tokenlist->getSettings());
|
|
|
|
valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
|
|
}
|
|
}
|
|
// container lifetimes
|
|
else if (astIsContainer(tok)) {
|
|
Token * parent = astParentSkipParens(tok);
|
|
if (!Token::Match(parent, ". %name% ("))
|
|
continue;
|
|
|
|
bool isContainerOfPointers = true;
|
|
const Token* containerTypeToken = tok->valueType()->containerTypeToken;
|
|
if (containerTypeToken) {
|
|
ValueType vt = ValueType::parseDecl(containerTypeToken, settings);
|
|
isContainerOfPointers = vt.pointer > 0;
|
|
}
|
|
|
|
LifetimeStore ls;
|
|
|
|
if (astIsIterator(parent->tokAt(2)))
|
|
ls = LifetimeStore{tok, "Iterator to container is created here.", ValueFlow::Value::LifetimeKind::Iterator};
|
|
else if ((astIsPointer(parent->tokAt(2)) && !isContainerOfPointers) || Token::Match(parent->next(), "data|c_str"))
|
|
ls = LifetimeStore{tok, "Pointer to container is created here.", ValueFlow::Value::LifetimeKind::Object};
|
|
else
|
|
continue;
|
|
|
|
// Dereferencing
|
|
if (tok->isUnaryOp("*") || parent->originalName() == "->")
|
|
ls.byDerefCopy(parent->tokAt(2), tokenlist, errorLogger, settings);
|
|
else
|
|
ls.byRef(parent->tokAt(2), tokenlist, errorLogger, settings);
|
|
|
|
}
|
|
// Check constructors
|
|
else if (Token::Match(tok, "=|return|%type%|%var% {")) {
|
|
valueFlowLifetimeConstructor(tok->next(), tokenlist, errorLogger, settings);
|
|
}
|
|
// Check function calls
|
|
else if (Token::Match(tok, "%name% (")) {
|
|
valueFlowLifetimeFunction(tok, tokenlist, errorLogger, settings);
|
|
}
|
|
// Check variables
|
|
else if (tok->variable()) {
|
|
ErrorPath errorPath;
|
|
const Variable * var = getLifetimeVariable(tok, errorPath);
|
|
if (!var)
|
|
continue;
|
|
if (var->nameToken() == tok)
|
|
continue;
|
|
if (var->isArray() && !var->isStlType() && !var->isArgument() && isDecayedPointer(tok)) {
|
|
errorPath.emplace_back(tok, "Array decayed to pointer here.");
|
|
|
|
ValueFlow::Value value;
|
|
value.valueType = ValueFlow::Value::ValueType::LIFETIME;
|
|
value.lifetimeScope = ValueFlow::Value::LifetimeScope::Local;
|
|
value.tokvalue = var->nameToken();
|
|
value.errorPath = errorPath;
|
|
setTokenValue(tok, value, tokenlist->getSettings());
|
|
|
|
valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
|
|
}
|
|
}
|
|
// Forward any lifetimes
|
|
else if (std::any_of(tok->values().begin(), tok->values().end(), std::mem_fn(&ValueFlow::Value::isLifetimeValue))) {
|
|
valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool isStdMoveOrStdForwarded(Token * tok, ValueFlow::Value::MoveKind * moveKind, Token ** varTok = nullptr)
|
|
{
|
|
if (tok->str() != "std")
|
|
return false;
|
|
ValueFlow::Value::MoveKind kind = ValueFlow::Value::MoveKind::NonMovedVariable;
|
|
Token * variableToken = nullptr;
|
|
if (Token::Match(tok, "std :: move ( %var% )")) {
|
|
variableToken = tok->tokAt(4);
|
|
kind = ValueFlow::Value::MoveKind::MovedVariable;
|
|
} else if (Token::simpleMatch(tok, "std :: forward <")) {
|
|
const Token * const leftAngle = tok->tokAt(3);
|
|
Token * rightAngle = leftAngle->link();
|
|
if (Token::Match(rightAngle, "> ( %var% )")) {
|
|
variableToken = rightAngle->tokAt(2);
|
|
kind = ValueFlow::Value::MoveKind::ForwardedVariable;
|
|
}
|
|
}
|
|
if (!variableToken)
|
|
return false;
|
|
if (variableToken->strAt(2) == ".") // Only partially moved
|
|
return false;
|
|
if (variableToken->valueType() && variableToken->valueType()->type >= ValueType::Type::VOID)
|
|
return false;
|
|
if (moveKind != nullptr)
|
|
*moveKind = kind;
|
|
if (varTok != nullptr)
|
|
*varTok = variableToken;
|
|
return true;
|
|
}
|
|
|
|
static bool isOpenParenthesisMemberFunctionCallOfVarId(const Token * openParenthesisToken, nonneg int varId)
|
|
{
|
|
const Token * varTok = openParenthesisToken->tokAt(-3);
|
|
return Token::Match(varTok, "%varid% . %name% (", varId) &&
|
|
varTok->next()->originalName() == emptyString;
|
|
}
|
|
|
|
static const Token * findOpenParentesisOfMove(const Token * moveVarTok)
|
|
{
|
|
const Token * tok = moveVarTok;
|
|
while (tok && tok->str() != "(")
|
|
tok = tok->previous();
|
|
return tok;
|
|
}
|
|
|
|
static const Token * findEndOfFunctionCallForParameter(const Token * parameterToken)
|
|
{
|
|
if (!parameterToken)
|
|
return nullptr;
|
|
const Token * parent = parameterToken->astParent();
|
|
while (parent && !parent->isOp() && parent->str() != "(")
|
|
parent = parent->astParent();
|
|
if (!parent)
|
|
return nullptr;
|
|
return nextAfterAstRightmostLeaf(parent);
|
|
}
|
|
|
|
static void valueFlowAfterMove(TokenList *tokenlist, SymbolDatabase* symboldatabase, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
if (!tokenlist->isCPP() || settings->standards.cpp < Standards::CPP11)
|
|
return;
|
|
for (const Scope * scope : symboldatabase->functionScopes) {
|
|
if (!scope)
|
|
continue;
|
|
const Token * start = scope->bodyStart;
|
|
if (scope->function) {
|
|
const Token * memberInitializationTok = scope->function->constructorMemberInitialization();
|
|
if (memberInitializationTok)
|
|
start = memberInitializationTok;
|
|
}
|
|
|
|
for (Token* tok = const_cast<Token*>(start); tok != scope->bodyEnd; tok = tok->next()) {
|
|
Token * varTok;
|
|
if (Token::Match(tok, "%var% . reset|clear (") && tok->next()->originalName() == emptyString) {
|
|
varTok = tok;
|
|
ValueFlow::Value value;
|
|
value.valueType = ValueFlow::Value::ValueType::MOVED;
|
|
value.moveKind = ValueFlow::Value::MoveKind::NonMovedVariable;
|
|
value.errorPath.emplace_back(tok, "Calling " + tok->next()->expressionString() + " makes " + tok->str() + " 'non-moved'");
|
|
value.setKnown();
|
|
std::list<ValueFlow::Value> values;
|
|
values.push_back(value);
|
|
|
|
const Variable *var = varTok->variable();
|
|
if (!var || (!var->isLocal() && !var->isArgument()))
|
|
continue;
|
|
const nonneg int varId = varTok->varId();
|
|
const Token * const endOfVarScope = var->scope()->bodyEnd;
|
|
setTokenValue(varTok, value, settings);
|
|
valueFlowForwardVariable(
|
|
varTok->next(), endOfVarScope, var, varId, values, false, false, tokenlist, errorLogger, settings);
|
|
continue;
|
|
}
|
|
ValueFlow::Value::MoveKind moveKind;
|
|
if (!isStdMoveOrStdForwarded(tok, &moveKind, &varTok))
|
|
continue;
|
|
const nonneg int varId = varTok->varId();
|
|
// x is not MOVED after assignment if code is: x = ... std::move(x) .. ;
|
|
const Token *parent = tok->astParent();
|
|
while (parent && parent->str() != "=" && parent->str() != "return" &&
|
|
!(parent->str() == "(" && isOpenParenthesisMemberFunctionCallOfVarId(parent, varId)))
|
|
parent = parent->astParent();
|
|
if (parent &&
|
|
(parent->str() == "return" || // MOVED in return statement
|
|
parent->str() == "(")) // MOVED in self assignment, isOpenParenthesisMemberFunctionCallOfVarId == true
|
|
continue;
|
|
if (parent && parent->astOperand1() && parent->astOperand1()->varId() == varId)
|
|
continue;
|
|
const Variable *var = varTok->variable();
|
|
if (!var)
|
|
continue;
|
|
const Token * const endOfVarScope = var->scope()->bodyEnd;
|
|
|
|
ValueFlow::Value value;
|
|
value.valueType = ValueFlow::Value::ValueType::MOVED;
|
|
value.moveKind = moveKind;
|
|
if (moveKind == ValueFlow::Value::MoveKind::MovedVariable)
|
|
value.errorPath.emplace_back(tok, "Calling std::move(" + varTok->str() + ")");
|
|
else // if (moveKind == ValueFlow::Value::ForwardedVariable)
|
|
value.errorPath.emplace_back(tok, "Calling std::forward(" + varTok->str() + ")");
|
|
value.setKnown();
|
|
std::list<ValueFlow::Value> values;
|
|
values.push_back(value);
|
|
const Token * openParentesisOfMove = findOpenParentesisOfMove(varTok);
|
|
const Token * endOfFunctionCall = findEndOfFunctionCallForParameter(openParentesisOfMove);
|
|
if (endOfFunctionCall)
|
|
valueFlowForwardVariable(const_cast<Token*>(endOfFunctionCall),
|
|
endOfVarScope,
|
|
var,
|
|
varId,
|
|
values,
|
|
false,
|
|
false,
|
|
tokenlist,
|
|
errorLogger,
|
|
settings);
|
|
}
|
|
}
|
|
}
|
|
|
|
static const Token* findIncompleteVar(const Token* start, const Token* end)
|
|
{
|
|
for (const Token* tok = start; tok != end; tok = tok->next()) {
|
|
if (tok->isIncompleteVar())
|
|
return tok;
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
static ValueFlow::Value makeConditionValue(long long val, const Token* condTok, bool assume)
|
|
{
|
|
ValueFlow::Value v(val);
|
|
v.setKnown();
|
|
v.condition = condTok;
|
|
if (assume)
|
|
v.errorPath.emplace_back(condTok, "Assuming condition '" + condTok->expressionString() + "' is true");
|
|
else
|
|
v.errorPath.emplace_back(condTok, "Assuming condition '" + condTok->expressionString() + "' is false");
|
|
return v;
|
|
}
|
|
//
|
|
static void valueFlowConditionExpressions(TokenList *tokenlist, SymbolDatabase* symboldatabase, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
for (const Scope * scope : symboldatabase->functionScopes) {
|
|
if (const Token* incompleteTok = findIncompleteVar(scope->bodyStart, scope->bodyEnd)) {
|
|
if (incompleteTok->isIncompleteVar()) {
|
|
if (settings->debugwarnings)
|
|
bailoutIncompleteVar(tokenlist, errorLogger, incompleteTok, "Skipping function due to incomplete variable " + incompleteTok->str());
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (const Token* tok = scope->bodyStart; tok != scope->bodyEnd; tok = tok->next()) {
|
|
if (!Token::simpleMatch(tok, "if ("))
|
|
continue;
|
|
// Skip known values
|
|
if (tok->next()->hasKnownValue())
|
|
continue;
|
|
Token * parenTok = tok->next();
|
|
if (!Token::simpleMatch(parenTok->link(), ") {"))
|
|
continue;
|
|
Token * blockTok = parenTok->link()->tokAt(1);
|
|
const Token* condTok = parenTok->astOperand2();
|
|
if (condTok->hasKnownIntValue())
|
|
continue;
|
|
|
|
Token* startTok = blockTok;
|
|
// Inner condition
|
|
{
|
|
std::vector<const Token*> conds = {condTok};
|
|
if (Token::simpleMatch(condTok, "&&")) {
|
|
std::vector<const Token*> args = astFlatten(condTok, "&&");
|
|
conds.insert(conds.end(), args.begin(), args.end());
|
|
}
|
|
for (const Token* condTok2:conds) {
|
|
ExpressionAnalyzer a1(condTok2, makeConditionValue(1, condTok2, true), tokenlist);
|
|
valueFlowGenericForward(startTok, startTok->link(), a1, settings);
|
|
|
|
OppositeExpressionAnalyzer a2(true, condTok2, makeConditionValue(0, condTok2, true), tokenlist);
|
|
valueFlowGenericForward(startTok, startTok->link(), a2, settings);
|
|
}
|
|
}
|
|
|
|
std::vector<const Token*> conds = {condTok};
|
|
if (Token::simpleMatch(condTok, "||")) {
|
|
std::vector<const Token*> args = astFlatten(condTok, "||");
|
|
conds.insert(conds.end(), args.begin(), args.end());
|
|
}
|
|
|
|
// Check else block
|
|
if (Token::simpleMatch(startTok->link(), "} else {")) {
|
|
startTok = startTok->link()->tokAt(2);
|
|
for (const Token* condTok2:conds) {
|
|
ExpressionAnalyzer a1(condTok2, makeConditionValue(0, condTok2, false), tokenlist);
|
|
valueFlowGenericForward(startTok, startTok->link(), a1, settings);
|
|
|
|
OppositeExpressionAnalyzer a2(true, condTok2, makeConditionValue(1, condTok2, false), tokenlist);
|
|
valueFlowGenericForward(startTok, startTok->link(), a2, settings);
|
|
}
|
|
}
|
|
|
|
// Check if the block terminates early
|
|
if (isEscapeScope(blockTok, tokenlist)) {
|
|
for (const Token* condTok2:conds) {
|
|
ExpressionAnalyzer a1(condTok2, makeConditionValue(0, condTok2, false), tokenlist);
|
|
valueFlowGenericForward(startTok->link()->next(), scope->bodyEnd, a1, settings);
|
|
|
|
OppositeExpressionAnalyzer a2(true, condTok2, makeConditionValue(1, condTok2, false), tokenlist);
|
|
valueFlowGenericForward(startTok->link()->next(), scope->bodyEnd, a2, settings);
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowForwardAssign(Token* const tok,
|
|
const Token* expr,
|
|
std::vector<const Variable*> vars,
|
|
std::list<ValueFlow::Value> values,
|
|
const bool init,
|
|
TokenList* const tokenlist,
|
|
ErrorLogger* const errorLogger,
|
|
const Settings* const settings)
|
|
{
|
|
const Token* endOfVarScope = getEndOfVarScope(tok, vars);
|
|
if (std::any_of(values.begin(), values.end(), std::mem_fn(&ValueFlow::Value::isLifetimeValue))) {
|
|
valueFlowForwardLifetime(tok, tokenlist, errorLogger, settings);
|
|
values.remove_if(std::mem_fn(&ValueFlow::Value::isLifetimeValue));
|
|
}
|
|
if (std::all_of(
|
|
vars.begin(), vars.end(), [&](const Variable* var) {
|
|
return !var->isPointer() && !var->isSmartPointer();
|
|
}))
|
|
values.remove_if(std::mem_fn(&ValueFlow::Value::isTokValue));
|
|
if (tok->astParent()) {
|
|
for (ValueFlow::Value& value : values) {
|
|
const std::string info = "Assignment '" + tok->astParent()->expressionString() + "', assigned value is " + value.infoString();
|
|
value.errorPath.emplace_back(tok, info);
|
|
}
|
|
}
|
|
|
|
if (tokenlist->isCPP() && vars.size() == 1 && Token::Match(vars.front()->typeStartToken(), "bool|_Bool")) {
|
|
std::list<ValueFlow::Value>::iterator it;
|
|
for (it = values.begin(); it != values.end(); ++it) {
|
|
if (it->isIntValue())
|
|
it->intvalue = (it->intvalue != 0);
|
|
if (it->isTokValue())
|
|
it ->intvalue = (it->tokvalue != nullptr);
|
|
}
|
|
}
|
|
|
|
// Static variable initialisation?
|
|
if (vars.size() == 1 && vars.front()->isStatic() && init)
|
|
lowerToPossible(values);
|
|
|
|
// Skip RHS
|
|
const Token * nextExpression = tok->astParent() ? nextAfterAstRightmostLeaf(tok->astParent()) : tok->next();
|
|
|
|
if (std::any_of(values.begin(), values.end(), std::mem_fn(&ValueFlow::Value::isTokValue))) {
|
|
std::list<ValueFlow::Value> tokvalues;
|
|
std::copy_if(values.begin(),
|
|
values.end(),
|
|
std::back_inserter(tokvalues),
|
|
std::mem_fn(&ValueFlow::Value::isTokValue));
|
|
valueFlowForward(const_cast<Token*>(nextExpression), endOfVarScope, expr, values, tokenlist, settings);
|
|
values.remove_if(std::mem_fn(&ValueFlow::Value::isTokValue));
|
|
}
|
|
for (ValueFlow::Value& value:values)
|
|
value.tokvalue = tok;
|
|
valueFlowForward(const_cast<Token*>(nextExpression), endOfVarScope, expr, values, tokenlist, settings);
|
|
}
|
|
|
|
static void valueFlowForwardAssign(Token* const tok,
|
|
const Variable* const var,
|
|
const std::list<ValueFlow::Value>& values,
|
|
const bool,
|
|
const bool init,
|
|
TokenList* const tokenlist,
|
|
ErrorLogger* const errorLogger,
|
|
const Settings* const settings)
|
|
{
|
|
valueFlowForwardAssign(tok, var->nameToken(), {var}, values, init, tokenlist, errorLogger, settings);
|
|
}
|
|
|
|
static std::list<ValueFlow::Value> truncateValues(std::list<ValueFlow::Value> values, const ValueType *valueType, const Settings *settings)
|
|
{
|
|
if (!valueType || !valueType->isIntegral())
|
|
return values;
|
|
|
|
const size_t sz = ValueFlow::getSizeOf(*valueType, settings);
|
|
|
|
for (ValueFlow::Value &value : values) {
|
|
if (value.isFloatValue()) {
|
|
value.intvalue = value.floatValue;
|
|
value.valueType = ValueFlow::Value::ValueType::INT;
|
|
}
|
|
|
|
if (value.isIntValue() && sz > 0 && sz < 8) {
|
|
const MathLib::biguint unsignedMaxValue = (1ULL << (sz * 8)) - 1ULL;
|
|
const MathLib::biguint signBit = 1ULL << (sz * 8 - 1);
|
|
value.intvalue &= unsignedMaxValue;
|
|
if (valueType->sign == ValueType::Sign::SIGNED && (value.intvalue & signBit))
|
|
value.intvalue |= ~unsignedMaxValue;
|
|
}
|
|
}
|
|
return values;
|
|
}
|
|
|
|
static bool isVariableInit(const Token *tok)
|
|
{
|
|
return tok->str() == "(" &&
|
|
tok->isBinaryOp() &&
|
|
tok->astOperand1()->variable() &&
|
|
tok->astOperand1()->variable()->nameToken() == tok->astOperand1() &&
|
|
tok->astOperand1()->variable()->valueType() &&
|
|
tok->astOperand1()->variable()->valueType()->type >= ValueType::Type::VOID &&
|
|
!Token::simpleMatch(tok->astOperand2(), ",");
|
|
}
|
|
|
|
static void valueFlowAfterAssign(TokenList *tokenlist, SymbolDatabase* symboldatabase, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
for (const Scope * scope : symboldatabase->functionScopes) {
|
|
std::set<nonneg int> aliased;
|
|
for (Token* tok = const_cast<Token*>(scope->bodyStart); tok != scope->bodyEnd; tok = tok->next()) {
|
|
// Alias
|
|
if (tok->isUnaryOp("&")) {
|
|
aliased.insert(tok->astOperand1()->exprId());
|
|
continue;
|
|
}
|
|
|
|
// Assignment
|
|
if ((tok->str() != "=" && !isVariableInit(tok)) || (tok->astParent()))
|
|
continue;
|
|
|
|
// Lhs should be a variable
|
|
if (!tok->astOperand1() || !tok->astOperand1()->exprId())
|
|
continue;
|
|
const nonneg int exprid = tok->astOperand1()->exprId();
|
|
if (aliased.find(exprid) != aliased.end())
|
|
continue;
|
|
std::vector<const Variable*> vars = getLHSVariables(tok);
|
|
|
|
// Rhs values..
|
|
if (!tok->astOperand2() || tok->astOperand2()->values().empty())
|
|
continue;
|
|
|
|
std::list<ValueFlow::Value> values = truncateValues(tok->astOperand2()->values(), tok->astOperand1()->valueType(), settings);
|
|
// Remove known values
|
|
std::set<ValueFlow::Value::ValueType> types;
|
|
if (tok->astOperand1()->hasKnownValue()) {
|
|
for (const ValueFlow::Value& value:tok->astOperand1()->values()) {
|
|
if (value.isKnown())
|
|
types.insert(value.valueType);
|
|
}
|
|
}
|
|
values.remove_if([&](const ValueFlow::Value& value) {
|
|
return types.count(value.valueType) > 0;
|
|
});
|
|
// Remove container size if its not a container
|
|
if (!astIsContainer(tok->astOperand2()))
|
|
values.remove_if([&](const ValueFlow::Value& value) {
|
|
return value.valueType == ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
});
|
|
if (values.empty())
|
|
continue;
|
|
const bool init = vars.size() == 1 && vars.front()->nameToken() == tok->astOperand1();
|
|
valueFlowForwardAssign(
|
|
tok->astOperand2(), tok->astOperand1(), vars, values, init, tokenlist, errorLogger, settings);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowSetConditionToKnown(const Token* tok, std::list<ValueFlow::Value>& values, bool then)
|
|
{
|
|
if (values.empty())
|
|
return;
|
|
if (then && !Token::Match(tok, "==|!|("))
|
|
return;
|
|
if (!then && !Token::Match(tok, "!=|%var%|("))
|
|
return;
|
|
if (isConditionKnown(tok, then))
|
|
changePossibleToKnown(values);
|
|
}
|
|
|
|
static bool isBreakScope(const Token* const endToken)
|
|
{
|
|
if (!Token::simpleMatch(endToken, "}"))
|
|
return false;
|
|
if (!Token::simpleMatch(endToken->link(), "{"))
|
|
return false;
|
|
return Token::findmatch(endToken->link(), "break|goto", endToken);
|
|
}
|
|
|
|
static ValueFlow::Value asImpossible(ValueFlow::Value v)
|
|
{
|
|
v.invertRange();
|
|
v.setImpossible();
|
|
return v;
|
|
}
|
|
|
|
static void insertImpossible(std::list<ValueFlow::Value>& values, const std::list<ValueFlow::Value>& input)
|
|
{
|
|
std::transform(input.begin(), input.end(), std::back_inserter(values), &asImpossible);
|
|
}
|
|
|
|
static void insertNegateKnown(std::list<ValueFlow::Value>& values, const std::list<ValueFlow::Value>& input)
|
|
{
|
|
for (ValueFlow::Value value:input) {
|
|
if (!value.isIntValue() && !value.isContainerSizeValue())
|
|
continue;
|
|
value.intvalue = !value.intvalue;
|
|
value.setKnown();
|
|
values.push_back(value);
|
|
}
|
|
}
|
|
|
|
static std::vector<const Variable*> getExprVariables(const Token* expr,
|
|
const TokenList* tokenlist,
|
|
const SymbolDatabase* symboldatabase,
|
|
const Settings* settings)
|
|
{
|
|
std::vector<const Variable*> result;
|
|
FwdAnalysis fwdAnalysis(tokenlist->isCPP(), settings->library);
|
|
std::set<nonneg int> varids = fwdAnalysis.getExprVarIds(expr);
|
|
std::transform(varids.begin(), varids.end(), std::back_inserter(result), [&](int id) {
|
|
return symboldatabase->getVariableFromVarId(id);
|
|
});
|
|
return result;
|
|
}
|
|
|
|
struct ConditionHandler {
|
|
struct Condition {
|
|
const Token *vartok;
|
|
std::list<ValueFlow::Value> true_values;
|
|
std::list<ValueFlow::Value> false_values;
|
|
bool inverted = false;
|
|
|
|
Condition() : vartok(nullptr), true_values(), false_values(), inverted(false) {}
|
|
};
|
|
|
|
virtual bool forward(Token* start,
|
|
const Token* stop,
|
|
const Token* exprTok,
|
|
const std::list<ValueFlow::Value>& values,
|
|
TokenList* tokenlist,
|
|
const Settings* settings) const = 0;
|
|
|
|
virtual void reverse(Token* start,
|
|
const Token* endToken,
|
|
const Token* exprTok,
|
|
const std::list<ValueFlow::Value>& values,
|
|
TokenList* tokenlist,
|
|
const Settings* settings) const = 0;
|
|
|
|
virtual Condition parse(const Token* tok, const Settings* settings) const = 0;
|
|
|
|
void traverseCondition(
|
|
TokenList* tokenlist,
|
|
SymbolDatabase* symboldatabase,
|
|
ErrorLogger* errorLogger,
|
|
const Settings* settings,
|
|
const std::function<
|
|
void(const Condition& cond, Token* tok, const Scope* scope, const std::vector<const Variable*>& vars)>& f) const {
|
|
for (const Scope *scope : symboldatabase->functionScopes) {
|
|
std::set<nonneg int> aliased;
|
|
for (Token *tok = const_cast<Token *>(scope->bodyStart); tok != scope->bodyEnd; tok = tok->next()) {
|
|
if (Token::Match(tok, "if|while|for ("))
|
|
continue;
|
|
|
|
if (Token::Match(tok, "= & %var% ;"))
|
|
aliased.insert(tok->tokAt(2)->varId());
|
|
const Token* top = tok->astTop();
|
|
if (!top)
|
|
continue;
|
|
|
|
if (!Token::Match(top->previous(), "if|while|for (") && !Token::Match(tok->astParent(), "&&|%oror%|?"))
|
|
continue;
|
|
|
|
Condition cond = parse(tok, settings);
|
|
if (!cond.vartok)
|
|
continue;
|
|
if (cond.vartok->variable() && cond.vartok->variable()->isVolatile())
|
|
continue;
|
|
if (cond.true_values.empty() || cond.false_values.empty())
|
|
continue;
|
|
|
|
if (exprDependsOnThis(cond.vartok))
|
|
continue;
|
|
std::vector<const Variable*> vars = getExprVariables(cond.vartok, tokenlist, symboldatabase, settings);
|
|
if (std::any_of(vars.begin(), vars.end(), [](const Variable* var) {
|
|
return !var;
|
|
}))
|
|
continue;
|
|
if (!vars.empty() && (vars.front()))
|
|
if (std::any_of(vars.begin(), vars.end(), [&](const Variable* var) {
|
|
return var && aliased.find(var->declarationId()) != aliased.end();
|
|
})) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist,
|
|
errorLogger,
|
|
cond.vartok,
|
|
"variable is aliased so we just skip all valueflow after condition");
|
|
continue;
|
|
}
|
|
f(cond, tok, scope, vars);
|
|
}
|
|
}
|
|
}
|
|
|
|
void beforeCondition(TokenList* tokenlist,
|
|
SymbolDatabase* symboldatabase,
|
|
ErrorLogger* errorLogger,
|
|
const Settings* settings) const {
|
|
traverseCondition(
|
|
tokenlist,
|
|
symboldatabase,
|
|
errorLogger,
|
|
settings,
|
|
[&](const Condition& cond, Token* tok, const Scope*, const std::vector<const Variable*>&) {
|
|
if (cond.vartok->exprId() == 0)
|
|
return;
|
|
|
|
// If condition is known then don't propagate value
|
|
if (tok->hasKnownIntValue())
|
|
return;
|
|
|
|
const Token* top = tok->astTop();
|
|
|
|
if (Token::Match(top, "%assign%"))
|
|
return;
|
|
if (Token::Match(cond.vartok->astParent(), "%assign%|++|--"))
|
|
return;
|
|
|
|
if (Token::simpleMatch(tok->astParent(), "?") && tok->astParent()->isExpandedMacro()) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist,
|
|
errorLogger,
|
|
tok,
|
|
"variable '" + cond.vartok->expressionString() + "', condition is defined in macro");
|
|
return;
|
|
}
|
|
|
|
// if,macro => bailout
|
|
if (Token::simpleMatch(top->previous(), "if (") && top->previous()->isExpandedMacro()) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist,
|
|
errorLogger,
|
|
tok,
|
|
"variable '" + cond.vartok->expressionString() + "', condition is defined in macro");
|
|
return;
|
|
}
|
|
|
|
std::list<ValueFlow::Value> values = cond.true_values;
|
|
if (cond.true_values != cond.false_values)
|
|
values.insert(values.end(), cond.false_values.begin(), cond.false_values.end());
|
|
|
|
// extra logic for unsigned variables 'i>=1' => possible value can also be 0
|
|
if (Token::Match(tok, "<|>")) {
|
|
values.remove_if([](const ValueFlow::Value& v) {
|
|
if (v.isIntValue())
|
|
return v.intvalue != 0;
|
|
return false;
|
|
});
|
|
if (cond.vartok->valueType() && cond.vartok->valueType()->sign != ValueType::Sign::UNSIGNED)
|
|
return;
|
|
}
|
|
if (values.empty())
|
|
return;
|
|
|
|
// bailout: for/while-condition, variable is changed in while loop
|
|
if (Token::Match(top->previous(), "for|while (") && Token::simpleMatch(top->link(), ") {")) {
|
|
|
|
// Variable changed in 3rd for-expression
|
|
if (Token::simpleMatch(top->previous(), "for (")) {
|
|
if (top->astOperand2() && top->astOperand2()->astOperand2() &&
|
|
isExpressionChanged(
|
|
cond.vartok, top->astOperand2()->astOperand2(), top->link(), settings, tokenlist->isCPP())) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist,
|
|
errorLogger,
|
|
tok,
|
|
"variable '" + cond.vartok->expressionString() + "' used in loop");
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Variable changed in loop code
|
|
const Token* const start = top;
|
|
const Token* const block = top->link()->next();
|
|
const Token* const end = block->link();
|
|
|
|
if (isExpressionChanged(cond.vartok, start, end, settings, tokenlist->isCPP())) {
|
|
// If its reassigned in loop then analyze from the end
|
|
if (!Token::Match(tok, "%assign%|++|--") &&
|
|
findExpression(cond.vartok->exprId(), start, end, [&](const Token* tok2) {
|
|
return Token::Match(tok2->astParent(), "%assign%") && astIsLHS(tok2);
|
|
})) {
|
|
// Start at the end of the loop body
|
|
Token* bodyTok = top->link()->next();
|
|
reverse(bodyTok->link(), bodyTok, cond.vartok, values, tokenlist, settings);
|
|
}
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist,
|
|
errorLogger,
|
|
tok,
|
|
"variable '" + cond.vartok->expressionString() + "' used in loop");
|
|
return;
|
|
}
|
|
}
|
|
|
|
Token* startTok = nullptr;
|
|
if (astIsRHS(tok))
|
|
startTok = tok->astParent();
|
|
else if (astIsLHS(tok))
|
|
startTok = previousBeforeAstLeftmostLeaf(tok->astParent());
|
|
if (!startTok)
|
|
startTok = tok->previous();
|
|
|
|
reverse(startTok, nullptr, cond.vartok, values, tokenlist, settings);
|
|
});
|
|
}
|
|
|
|
void afterCondition(TokenList* tokenlist,
|
|
SymbolDatabase* symboldatabase,
|
|
ErrorLogger* errorLogger,
|
|
const Settings* settings) const {
|
|
traverseCondition(
|
|
tokenlist,
|
|
symboldatabase,
|
|
errorLogger,
|
|
settings,
|
|
[&](const Condition& cond, Token* tok, const Scope* scope, const std::vector<const Variable*>& vars) {
|
|
if (Token::simpleMatch(tok->astParent(), "?"))
|
|
return;
|
|
const Token* top = tok->astTop();
|
|
|
|
std::list<ValueFlow::Value> thenValues;
|
|
std::list<ValueFlow::Value> elseValues;
|
|
|
|
if (!Token::Match(tok, "!=|=|(|.") && tok != cond.vartok) {
|
|
thenValues.insert(thenValues.end(), cond.true_values.begin(), cond.true_values.end());
|
|
if (isConditionKnown(tok, false))
|
|
insertImpossible(elseValues, cond.false_values);
|
|
}
|
|
if (!Token::Match(tok, "==|!")) {
|
|
elseValues.insert(elseValues.end(), cond.false_values.begin(), cond.false_values.end());
|
|
if (isConditionKnown(tok, true)) {
|
|
insertImpossible(thenValues, cond.true_values);
|
|
if (Token::Match(tok, "(|.|%var%") && astIsBool(tok))
|
|
insertNegateKnown(thenValues, cond.true_values);
|
|
}
|
|
}
|
|
|
|
if (cond.inverted)
|
|
std::swap(thenValues, elseValues);
|
|
|
|
if (Token::Match(tok->astParent(), "%oror%|&&")) {
|
|
Token* parent = tok->astParent();
|
|
if (astIsRHS(tok) && parent->astParent() && parent->str() == parent->astParent()->str())
|
|
parent = parent->astParent();
|
|
else if (!astIsLHS(tok)) {
|
|
parent = nullptr;
|
|
}
|
|
if (parent) {
|
|
const std::string& op(parent->str());
|
|
std::list<ValueFlow::Value> values;
|
|
if (op == "&&")
|
|
values = thenValues;
|
|
else if (op == "||")
|
|
values = elseValues;
|
|
if (Token::Match(tok, "==|!="))
|
|
changePossibleToKnown(values);
|
|
if (!values.empty()) {
|
|
bool assign = false;
|
|
visitAstNodes(parent->astOperand2(), [&](Token* tok2) {
|
|
if (tok2 == tok)
|
|
return ChildrenToVisit::done;
|
|
if (isSameExpression(
|
|
tokenlist->isCPP(), false, cond.vartok, tok2, settings->library, true, false))
|
|
setTokenValue(tok2, values.front(), settings);
|
|
else if (Token::Match(tok2, "++|--|=") && isSameExpression(tokenlist->isCPP(),
|
|
false,
|
|
cond.vartok,
|
|
tok2->astOperand1(),
|
|
settings->library,
|
|
true,
|
|
false)) {
|
|
assign = true;
|
|
return ChildrenToVisit::done;
|
|
}
|
|
return ChildrenToVisit::op1_and_op2;
|
|
});
|
|
if (assign)
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
{
|
|
const Token* tok2 = tok;
|
|
std::string op;
|
|
bool mixedOperators = false;
|
|
while (tok2->astParent()) {
|
|
const Token* parent = tok2->astParent();
|
|
if (Token::Match(parent, "%oror%|&&")) {
|
|
if (op.empty()) {
|
|
op = parent->str();
|
|
} else if (op != parent->str()) {
|
|
mixedOperators = true;
|
|
break;
|
|
}
|
|
}
|
|
if (parent->str() == "!") {
|
|
op = (op == "&&" ? "||" : "&&");
|
|
}
|
|
tok2 = parent;
|
|
}
|
|
|
|
if (mixedOperators) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (top && Token::Match(top->previous(), "if|while (") && !top->previous()->isExpandedMacro()) {
|
|
// does condition reassign variable?
|
|
if (tok != top->astOperand2() && Token::Match(top->astOperand2(), "%oror%|&&") &&
|
|
isVariablesChanged(top, top->link(), 0, vars, settings, tokenlist->isCPP())) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist, errorLogger, tok, "assignment in condition");
|
|
return;
|
|
}
|
|
|
|
// start token of conditional code
|
|
Token* startTokens[] = {nullptr, nullptr};
|
|
|
|
// if astParent is "!" we need to invert codeblock
|
|
{
|
|
const Token* tok2 = tok;
|
|
while (tok2->astParent()) {
|
|
const Token* parent = tok2->astParent();
|
|
while (parent && parent->str() == "&&")
|
|
parent = parent->astParent();
|
|
if (parent && (parent->str() == "!" || Token::simpleMatch(parent, "== false"))) {
|
|
std::swap(thenValues, elseValues);
|
|
}
|
|
tok2 = parent;
|
|
}
|
|
}
|
|
|
|
// determine startToken(s)
|
|
if (Token::simpleMatch(top->link(), ") {"))
|
|
startTokens[0] = top->link()->next();
|
|
if (Token::simpleMatch(top->link()->linkAt(1), "} else {"))
|
|
startTokens[1] = top->link()->linkAt(1)->tokAt(2);
|
|
|
|
int changeBlock = -1;
|
|
|
|
for (int i = 0; i < 2; i++) {
|
|
const Token* const startToken = startTokens[i];
|
|
if (!startToken)
|
|
continue;
|
|
std::list<ValueFlow::Value>& values = (i == 0 ? thenValues : elseValues);
|
|
valueFlowSetConditionToKnown(tok, values, i == 0);
|
|
|
|
// TODO: The endToken should not be startTokens[i]->link() in the valueFlowForwardVariable call
|
|
if (forward(startTokens[i], startTokens[i]->link(), cond.vartok, values, tokenlist, settings))
|
|
changeBlock = i;
|
|
changeKnownToPossible(values);
|
|
}
|
|
// TODO: Values changed in noreturn blocks should not bail
|
|
if (changeBlock >= 0 && !Token::simpleMatch(top->previous(), "while (")) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist,
|
|
errorLogger,
|
|
startTokens[changeBlock]->link(),
|
|
"valueFlowAfterCondition: " + cond.vartok->expressionString() +
|
|
" is changed in conditional block");
|
|
return;
|
|
}
|
|
|
|
// After conditional code..
|
|
if (Token::simpleMatch(top->link(), ") {")) {
|
|
Token* after = top->link()->linkAt(1);
|
|
const Token* unknownFunction = nullptr;
|
|
const bool isWhile =
|
|
tok->astParent() && Token::simpleMatch(tok->astParent()->previous(), "while (");
|
|
bool dead_if = (!isBreakScope(after) && isWhile) ||
|
|
(isReturnScope(after, &settings->library, &unknownFunction) && !isWhile);
|
|
bool dead_else = false;
|
|
|
|
if (!dead_if && unknownFunction) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist, errorLogger, unknownFunction, "possible noreturn scope");
|
|
return;
|
|
}
|
|
|
|
if (Token::simpleMatch(after, "} else {")) {
|
|
after = after->linkAt(2);
|
|
unknownFunction = nullptr;
|
|
dead_else = isReturnScope(after, &settings->library, &unknownFunction);
|
|
if (!dead_else && unknownFunction) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist, errorLogger, unknownFunction, "possible noreturn scope");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (dead_if && dead_else)
|
|
return;
|
|
|
|
std::list<ValueFlow::Value> values;
|
|
if (dead_if) {
|
|
values = elseValues;
|
|
} else if (dead_else) {
|
|
values = thenValues;
|
|
} else {
|
|
std::copy_if(thenValues.begin(),
|
|
thenValues.end(),
|
|
std::back_inserter(values),
|
|
std::mem_fn(&ValueFlow::Value::isPossible));
|
|
std::copy_if(elseValues.begin(),
|
|
elseValues.end(),
|
|
std::back_inserter(values),
|
|
std::mem_fn(&ValueFlow::Value::isPossible));
|
|
}
|
|
|
|
if (dead_if || dead_else) {
|
|
if (Token::Match(tok->astParent(), "&&|&")) {
|
|
values.remove_if(std::mem_fn(&ValueFlow::Value::isImpossible));
|
|
changeKnownToPossible(values);
|
|
} else {
|
|
valueFlowSetConditionToKnown(tok, values, true);
|
|
valueFlowSetConditionToKnown(tok, values, false);
|
|
}
|
|
}
|
|
if (!values.empty())
|
|
forward(after, scope->bodyEnd, cond.vartok, values, tokenlist, settings);
|
|
}
|
|
}
|
|
});
|
|
}
|
|
virtual ~ConditionHandler() {}
|
|
};
|
|
|
|
static void valueFlowCondition(const ValuePtr<ConditionHandler>& handler,
|
|
TokenList* tokenlist,
|
|
SymbolDatabase* symboldatabase,
|
|
ErrorLogger* errorLogger,
|
|
const Settings* settings)
|
|
{
|
|
handler->beforeCondition(tokenlist, symboldatabase, errorLogger, settings);
|
|
handler->afterCondition(tokenlist, symboldatabase, errorLogger, settings);
|
|
}
|
|
|
|
struct SimpleConditionHandler : ConditionHandler {
|
|
virtual bool forward(Token* start,
|
|
const Token* stop,
|
|
const Token* exprTok,
|
|
const std::list<ValueFlow::Value>& values,
|
|
TokenList* tokenlist,
|
|
const Settings* settings) const OVERRIDE {
|
|
return valueFlowForward(start->next(), stop, exprTok, values, tokenlist, settings).isModified();
|
|
}
|
|
|
|
virtual void reverse(Token* start,
|
|
const Token* endToken,
|
|
const Token* exprTok,
|
|
const std::list<ValueFlow::Value>& values,
|
|
TokenList* tokenlist,
|
|
const Settings* settings) const OVERRIDE {
|
|
return valueFlowReverse(start, endToken, exprTok, values, tokenlist, settings);
|
|
}
|
|
|
|
virtual Condition parse(const Token* tok, const Settings*) const OVERRIDE {
|
|
Condition cond;
|
|
ValueFlow::Value true_value;
|
|
ValueFlow::Value false_value;
|
|
const Token *vartok = parseCompareInt(tok, true_value, false_value);
|
|
if (vartok) {
|
|
if (vartok->hasKnownValue())
|
|
return cond;
|
|
if (vartok->str() == "=" && vartok->astOperand1() && vartok->astOperand2())
|
|
vartok = vartok->astOperand1();
|
|
cond.true_values.push_back(true_value);
|
|
cond.false_values.push_back(false_value);
|
|
cond.vartok = vartok;
|
|
return cond;
|
|
}
|
|
|
|
if (tok->str() == "!") {
|
|
vartok = tok->astOperand1();
|
|
|
|
} else if (tok->astParent() && (Token::Match(tok->astParent(), "%oror%|&&|?") ||
|
|
Token::Match(tok->astParent()->previous(), "if|while ("))) {
|
|
if (Token::simpleMatch(tok, "="))
|
|
vartok = tok->astOperand1();
|
|
else if (!Token::Match(tok, "%comp%|%assign%"))
|
|
vartok = tok;
|
|
}
|
|
|
|
if (!vartok)
|
|
return cond;
|
|
cond.true_values.emplace_back(tok, 0LL);
|
|
cond.false_values.emplace_back(tok, 0LL);
|
|
cond.vartok = vartok;
|
|
|
|
return cond;
|
|
}
|
|
};
|
|
|
|
static bool isInBounds(const ValueFlow::Value& value, MathLib::bigint x)
|
|
{
|
|
if (value.intvalue == x)
|
|
return true;
|
|
if (value.bound == ValueFlow::Value::Bound::Lower && value.intvalue > x)
|
|
return false;
|
|
if (value.bound == ValueFlow::Value::Bound::Upper && value.intvalue < x)
|
|
return false;
|
|
// Checking for equality is not necessary since we already know the value is not equal
|
|
if (value.bound == ValueFlow::Value::Bound::Point)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static const ValueFlow::Value* getCompareIntValue(const std::list<ValueFlow::Value>& values, std::function<bool(MathLib::bigint, MathLib::bigint)> compare)
|
|
{
|
|
const ValueFlow::Value* result = nullptr;
|
|
for (const ValueFlow::Value& value : values) {
|
|
if (!value.isIntValue())
|
|
continue;
|
|
if (result)
|
|
result = &std::min(value, *result, [compare](const ValueFlow::Value& x, const ValueFlow::Value& y) {
|
|
return compare(x.intvalue, y.intvalue);
|
|
});
|
|
else
|
|
result = &value;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static const ValueFlow::Value* proveLessThan(const std::list<ValueFlow::Value>& values, MathLib::bigint x)
|
|
{
|
|
const ValueFlow::Value* result = nullptr;
|
|
const ValueFlow::Value* maxValue = getCompareIntValue(values, std::greater<MathLib::bigint> {});
|
|
if (maxValue && maxValue->isImpossible() && maxValue->bound == ValueFlow::Value::Bound::Lower) {
|
|
if (maxValue->intvalue <= x)
|
|
result = maxValue;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static const ValueFlow::Value* proveGreaterThan(const std::list<ValueFlow::Value>& values, MathLib::bigint x)
|
|
{
|
|
const ValueFlow::Value* result = nullptr;
|
|
const ValueFlow::Value* minValue = getCompareIntValue(values, std::less<MathLib::bigint> {});
|
|
if (minValue && minValue->isImpossible() && minValue->bound == ValueFlow::Value::Bound::Upper) {
|
|
if (minValue->intvalue >= x)
|
|
result = minValue;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static const ValueFlow::Value* proveNotEqual(const std::list<ValueFlow::Value>& values, MathLib::bigint x)
|
|
{
|
|
const ValueFlow::Value* result = nullptr;
|
|
for (const ValueFlow::Value& value : values) {
|
|
if (value.valueType != ValueFlow::Value::ValueType::INT)
|
|
continue;
|
|
if (result && !isInBounds(value, result->intvalue))
|
|
continue;
|
|
if (value.isImpossible()) {
|
|
if (value.intvalue == x)
|
|
return &value;
|
|
if (!isInBounds(value, x))
|
|
continue;
|
|
result = &value;
|
|
} else {
|
|
if (value.intvalue == x)
|
|
return nullptr;
|
|
if (!isInBounds(value, x))
|
|
continue;
|
|
result = nullptr;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static void valueFlowInferCondition(TokenList* tokenlist,
|
|
const Settings* settings)
|
|
{
|
|
for (Token* tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (!tok->astParent())
|
|
continue;
|
|
if (tok->hasKnownValue())
|
|
continue;
|
|
if (tok->variable() && (Token::Match(tok->astParent(), "?|&&|!|%oror%") ||
|
|
Token::Match(tok->astParent()->previous(), "if|while ("))) {
|
|
const ValueFlow::Value* result = proveNotEqual(tok->values(), 0);
|
|
if (!result)
|
|
continue;
|
|
ValueFlow::Value value = *result;
|
|
value.intvalue = 1;
|
|
value.bound = ValueFlow::Value::Bound::Point;
|
|
value.setKnown();
|
|
setTokenValue(tok, value, settings);
|
|
} else if (tok->isComparisonOp()) {
|
|
MathLib::bigint val = 0;
|
|
const Token* varTok = nullptr;
|
|
std::string op = tok->str();
|
|
if (tok->astOperand1()->hasKnownIntValue()) {
|
|
val = tok->astOperand1()->values().front().intvalue;
|
|
varTok = tok->astOperand2();
|
|
// Flip the operator
|
|
if (op == ">")
|
|
op = "<";
|
|
else if (op == "<")
|
|
op = ">";
|
|
else if (op == ">=")
|
|
op = "<=";
|
|
else if (op == "<=")
|
|
op = ">=";
|
|
} else if (tok->astOperand2()->hasKnownIntValue()) {
|
|
val = tok->astOperand2()->values().front().intvalue;
|
|
varTok = tok->astOperand1();
|
|
}
|
|
if (!varTok)
|
|
continue;
|
|
if (varTok->hasKnownIntValue())
|
|
continue;
|
|
if (varTok->values().empty())
|
|
continue;
|
|
const ValueFlow::Value* result = nullptr;
|
|
bool known = false;
|
|
if (op == "==" || op == "!=") {
|
|
result = proveNotEqual(varTok->values(), val);
|
|
known = op == "!=";
|
|
} else if (op == "<" || op == ">=") {
|
|
result = proveLessThan(varTok->values(), val);
|
|
known = op == "<";
|
|
if (!result && !isSaturated(val)) {
|
|
result = proveGreaterThan(varTok->values(), val - 1);
|
|
known = op == ">=";
|
|
}
|
|
} else if (op == ">" || op == "<=") {
|
|
result = proveGreaterThan(varTok->values(), val);
|
|
known = op == ">";
|
|
if (!result && !isSaturated(val)) {
|
|
result = proveLessThan(varTok->values(), val + 1);
|
|
known = op == "<=";
|
|
}
|
|
}
|
|
if (!result)
|
|
continue;
|
|
ValueFlow::Value value = *result;
|
|
value.intvalue = known;
|
|
value.bound = ValueFlow::Value::Bound::Point;
|
|
value.setKnown();
|
|
setTokenValue(tok, value, settings);
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool valueFlowForLoop2(const Token *tok,
|
|
ProgramMemory *memory1,
|
|
ProgramMemory *memory2,
|
|
ProgramMemory *memoryAfter)
|
|
{
|
|
// for ( firstExpression ; secondExpression ; thirdExpression )
|
|
const Token *firstExpression = tok->next()->astOperand2()->astOperand1();
|
|
const Token *secondExpression = tok->next()->astOperand2()->astOperand2()->astOperand1();
|
|
const Token *thirdExpression = tok->next()->astOperand2()->astOperand2()->astOperand2();
|
|
|
|
ProgramMemory programMemory;
|
|
MathLib::bigint result(0);
|
|
bool error = false;
|
|
execute(firstExpression, &programMemory, &result, &error);
|
|
if (error)
|
|
return false;
|
|
execute(secondExpression, &programMemory, &result, &error);
|
|
if (result == 0) // 2nd expression is false => no looping
|
|
return false;
|
|
if (error) {
|
|
// If a variable is reassigned in second expression, return false
|
|
bool reassign = false;
|
|
visitAstNodes(secondExpression,
|
|
[&](const Token *t) {
|
|
if (t->str() == "=" && t->astOperand1() && programMemory.hasValue(t->astOperand1()->varId()))
|
|
// TODO: investigate what variable is assigned.
|
|
reassign = true;
|
|
return reassign ? ChildrenToVisit::done : ChildrenToVisit::op1_and_op2;
|
|
});
|
|
if (reassign)
|
|
return false;
|
|
}
|
|
|
|
ProgramMemory startMemory(programMemory);
|
|
ProgramMemory endMemory;
|
|
|
|
int maxcount = 10000;
|
|
while (result != 0 && !error && --maxcount > 0) {
|
|
endMemory = programMemory;
|
|
execute(thirdExpression, &programMemory, &result, &error);
|
|
if (!error)
|
|
execute(secondExpression, &programMemory, &result, &error);
|
|
}
|
|
|
|
memory1->swap(startMemory);
|
|
if (!error) {
|
|
memory2->swap(endMemory);
|
|
memoryAfter->swap(programMemory);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static void valueFlowForLoopSimplify(Token * const bodyStart, const nonneg int varid, bool globalvar, const MathLib::bigint value, TokenList *tokenlist, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
const Token * const bodyEnd = bodyStart->link();
|
|
|
|
// Is variable modified inside for loop
|
|
if (isVariableChanged(bodyStart, bodyEnd, varid, globalvar, settings, tokenlist->isCPP()))
|
|
return;
|
|
|
|
for (Token *tok2 = bodyStart->next(); tok2 != bodyEnd; tok2 = tok2->next()) {
|
|
if (tok2->varId() == varid) {
|
|
const Token * parent = tok2->astParent();
|
|
while (parent) {
|
|
const Token * const p = parent;
|
|
parent = parent->astParent();
|
|
if (!parent || parent->str() == ":")
|
|
break;
|
|
if (parent->str() == "?") {
|
|
if (parent->astOperand2() != p)
|
|
parent = nullptr;
|
|
break;
|
|
}
|
|
}
|
|
if (parent) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist, errorLogger, tok2, "For loop variable " + tok2->str() + " stopping on ?");
|
|
continue;
|
|
}
|
|
|
|
ValueFlow::Value value1(value);
|
|
value1.varId = tok2->varId();
|
|
setTokenValue(tok2, value1, settings);
|
|
}
|
|
|
|
if (Token::Match(tok2, "%oror%|&&")) {
|
|
const ProgramMemory programMemory(getProgramMemory(tok2->astTop(), varid, ValueFlow::Value(value)));
|
|
if ((tok2->str() == "&&" && !conditionIsTrue(tok2->astOperand1(), programMemory)) ||
|
|
(tok2->str() == "||" && !conditionIsFalse(tok2->astOperand1(), programMemory))) {
|
|
// Skip second expression..
|
|
const Token *parent = tok2;
|
|
while (parent && parent->str() == tok2->str())
|
|
parent = parent->astParent();
|
|
// Jump to end of condition
|
|
if (parent && parent->str() == "(") {
|
|
tok2 = parent->link();
|
|
// cast
|
|
if (Token::simpleMatch(tok2, ") ("))
|
|
tok2 = tok2->linkAt(1);
|
|
}
|
|
}
|
|
|
|
}
|
|
if ((tok2->str() == "&&" && conditionIsFalse(tok2->astOperand1(), getProgramMemory(tok2->astTop(), varid, ValueFlow::Value(value)))) ||
|
|
(tok2->str() == "||" && conditionIsTrue(tok2->astOperand1(), getProgramMemory(tok2->astTop(), varid, ValueFlow::Value(value)))))
|
|
break;
|
|
|
|
else if (Token::simpleMatch(tok2, ") {") && Token::findmatch(tok2->link(), "%varid%", tok2, varid)) {
|
|
if (Token::findmatch(tok2, "continue|break|return", tok2->linkAt(1), varid)) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist, errorLogger, tok2, "For loop variable bailout on conditional continue|break|return");
|
|
break;
|
|
}
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist, errorLogger, tok2, "For loop variable skipping conditional scope");
|
|
tok2 = tok2->next()->link();
|
|
if (Token::simpleMatch(tok2, "} else {")) {
|
|
if (Token::findmatch(tok2, "continue|break|return", tok2->linkAt(2), varid)) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist, errorLogger, tok2, "For loop variable bailout on conditional continue|break|return");
|
|
break;
|
|
}
|
|
|
|
tok2 = tok2->linkAt(2);
|
|
}
|
|
}
|
|
|
|
else if (Token::simpleMatch(tok2, ") {")) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist, errorLogger, tok2, "For loop skipping {} code");
|
|
tok2 = tok2->linkAt(1);
|
|
if (Token::simpleMatch(tok2, "} else {"))
|
|
tok2 = tok2->linkAt(2);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowForLoopSimplifyAfter(Token *fortok, nonneg int varid, const MathLib::bigint num, TokenList *tokenlist, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
const Token *vartok = nullptr;
|
|
for (const Token *tok = fortok; tok; tok = tok->next()) {
|
|
if (tok->varId() == varid) {
|
|
vartok = tok;
|
|
break;
|
|
}
|
|
}
|
|
if (!vartok || !vartok->variable())
|
|
return;
|
|
|
|
const Variable *var = vartok->variable();
|
|
const Token *endToken = nullptr;
|
|
if (var->isLocal())
|
|
endToken = var->scope()->bodyEnd;
|
|
else
|
|
endToken = fortok->scope()->bodyEnd;
|
|
|
|
Token* blockTok = fortok->linkAt(1)->linkAt(1);
|
|
std::list<ValueFlow::Value> values;
|
|
values.emplace_back(num);
|
|
values.back().errorPath.emplace_back(fortok,"After for loop, " + var->name() + " has value " + values.back().infoString());
|
|
|
|
if (blockTok != endToken) {
|
|
valueFlowForwardVariable(
|
|
blockTok->next(), endToken, var, varid, values, false, false, tokenlist, errorLogger, settings);
|
|
}
|
|
}
|
|
|
|
static void valueFlowForLoop(TokenList *tokenlist, SymbolDatabase* symboldatabase, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
for (const Scope &scope : symboldatabase->scopeList) {
|
|
if (scope.type != Scope::eFor)
|
|
continue;
|
|
|
|
Token* tok = const_cast<Token*>(scope.classDef);
|
|
Token* const bodyStart = const_cast<Token*>(scope.bodyStart);
|
|
|
|
if (!Token::simpleMatch(tok->next()->astOperand2(), ";") ||
|
|
!Token::simpleMatch(tok->next()->astOperand2()->astOperand2(), ";"))
|
|
continue;
|
|
|
|
nonneg int varid;
|
|
bool knownInitValue, partialCond;
|
|
MathLib::bigint initValue, stepValue, lastValue;
|
|
|
|
if (extractForLoopValues(tok, &varid, &knownInitValue, &initValue, &partialCond, &stepValue, &lastValue)) {
|
|
const bool executeBody = !knownInitValue || initValue <= lastValue;
|
|
if (executeBody) {
|
|
valueFlowForLoopSimplify(bodyStart, varid, false, initValue, tokenlist, errorLogger, settings);
|
|
if (stepValue == 1)
|
|
valueFlowForLoopSimplify(bodyStart, varid, false, lastValue, tokenlist, errorLogger, settings);
|
|
}
|
|
const MathLib::bigint afterValue = executeBody ? lastValue + stepValue : initValue;
|
|
valueFlowForLoopSimplifyAfter(tok, varid, afterValue, tokenlist, errorLogger, settings);
|
|
} else {
|
|
ProgramMemory mem1, mem2, memAfter;
|
|
if (valueFlowForLoop2(tok, &mem1, &mem2, &memAfter)) {
|
|
ProgramMemory::Map::const_iterator it;
|
|
for (it = mem1.values.begin(); it != mem1.values.end(); ++it) {
|
|
if (!it->second.isIntValue())
|
|
continue;
|
|
valueFlowForLoopSimplify(bodyStart, it->first, false, it->second.intvalue, tokenlist, errorLogger, settings);
|
|
}
|
|
for (it = mem2.values.begin(); it != mem2.values.end(); ++it) {
|
|
if (!it->second.isIntValue())
|
|
continue;
|
|
valueFlowForLoopSimplify(bodyStart, it->first, false, it->second.intvalue, tokenlist, errorLogger, settings);
|
|
}
|
|
for (it = memAfter.values.begin(); it != memAfter.values.end(); ++it) {
|
|
if (!it->second.isIntValue())
|
|
continue;
|
|
valueFlowForLoopSimplifyAfter(tok, it->first, it->second.intvalue, tokenlist, errorLogger, settings);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
struct MultiValueFlowAnalyzer : ValueFlowAnalyzer {
|
|
std::unordered_map<nonneg int, ValueFlow::Value> values;
|
|
std::unordered_map<nonneg int, const Variable*> vars;
|
|
SymbolDatabase* symboldatabase;
|
|
|
|
MultiValueFlowAnalyzer() : ValueFlowAnalyzer(), values(), vars(), symboldatabase(nullptr) {}
|
|
|
|
MultiValueFlowAnalyzer(const std::unordered_map<const Variable*, ValueFlow::Value>& args, const TokenList* t, SymbolDatabase* s)
|
|
: ValueFlowAnalyzer(t), values(), vars(), symboldatabase(s) {
|
|
for (const auto& p:args) {
|
|
values[p.first->declarationId()] = p.second;
|
|
vars[p.first->declarationId()] = p.first;
|
|
}
|
|
}
|
|
|
|
virtual const std::unordered_map<nonneg int, const Variable*>& getVars() const {
|
|
return vars;
|
|
}
|
|
|
|
virtual const ValueFlow::Value* getValue(const Token* tok) const OVERRIDE {
|
|
if (tok->varId() == 0)
|
|
return nullptr;
|
|
auto it = values.find(tok->varId());
|
|
if (it == values.end())
|
|
return nullptr;
|
|
return &it->second;
|
|
}
|
|
virtual ValueFlow::Value* getValue(const Token* tok) OVERRIDE {
|
|
if (tok->varId() == 0)
|
|
return nullptr;
|
|
auto it = values.find(tok->varId());
|
|
if (it == values.end())
|
|
return nullptr;
|
|
return &it->second;
|
|
}
|
|
|
|
virtual void makeConditional() OVERRIDE {
|
|
for (auto&& p:values) {
|
|
p.second.conditional = true;
|
|
}
|
|
}
|
|
|
|
virtual void addErrorPath(const Token* tok, const std::string& s) OVERRIDE {
|
|
for (auto&& p:values) {
|
|
p.second.errorPath.emplace_back(tok, "Assuming condition is " + s);
|
|
}
|
|
}
|
|
|
|
virtual bool isAlias(const Token* tok, bool& inconclusive) const OVERRIDE {
|
|
const auto range = SelectValueFromVarIdMapRange(&values);
|
|
|
|
for (const auto& p:getVars()) {
|
|
nonneg int varid = p.first;
|
|
const Variable* var = p.second;
|
|
if (tok->varId() == varid)
|
|
return true;
|
|
if (isAliasOf(var, tok, varid, range, &inconclusive))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
virtual bool isGlobal() const OVERRIDE {
|
|
return false;
|
|
}
|
|
|
|
virtual bool lowerToPossible() OVERRIDE {
|
|
for (auto&& p:values) {
|
|
if (p.second.isImpossible())
|
|
return false;
|
|
p.second.changeKnownToPossible();
|
|
}
|
|
return true;
|
|
}
|
|
virtual bool lowerToInconclusive() OVERRIDE {
|
|
for (auto&& p:values) {
|
|
if (p.second.isImpossible())
|
|
return false;
|
|
p.second.setInconclusive();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
virtual bool isConditional() const OVERRIDE {
|
|
for (auto&& p:values) {
|
|
if (p.second.conditional)
|
|
return true;
|
|
if (p.second.condition)
|
|
return !p.second.isImpossible();
|
|
}
|
|
return false;
|
|
}
|
|
|
|
virtual bool updateScope(const Token* endBlock, bool) const OVERRIDE {
|
|
const Scope* scope = endBlock->scope();
|
|
if (!scope)
|
|
return false;
|
|
if (scope->type == Scope::eLambda) {
|
|
for (const auto& p:values) {
|
|
if (!p.second.isLifetimeValue())
|
|
return false;
|
|
}
|
|
return true;
|
|
} else if (scope->type == Scope::eIf || scope->type == Scope::eElse || scope->type == Scope::eWhile ||
|
|
scope->type == Scope::eFor) {
|
|
auto pred = [](const ValueFlow::Value& value) {
|
|
if (value.isKnown())
|
|
return true;
|
|
if (value.isImpossible())
|
|
return true;
|
|
if (value.isLifetimeValue())
|
|
return true;
|
|
return false;
|
|
};
|
|
if (std::all_of(values.begin(), values.end(), std::bind(pred, std::bind(SelectMapValues{}, std::placeholders::_1))))
|
|
return true;
|
|
if (isConditional())
|
|
return false;
|
|
const Token* condTok = getCondTokFromEnd(endBlock);
|
|
std::set<nonneg int> varids;
|
|
std::transform(getVars().begin(), getVars().end(), std::inserter(varids, varids.begin()), SelectMapKeys{});
|
|
return bifurcate(condTok, varids, getSettings());
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
virtual bool match(const Token* tok) const OVERRIDE {
|
|
return values.count(tok->varId()) > 0;
|
|
}
|
|
|
|
virtual ProgramState getProgramState() const OVERRIDE {
|
|
ProgramState ps;
|
|
for (const auto& p:values)
|
|
ps[p.first] = p.second;
|
|
return ps;
|
|
}
|
|
|
|
virtual void forkScope(const Token* endBlock) OVERRIDE {
|
|
ProgramMemory pm = {getProgramState()};
|
|
const Scope* scope = endBlock->scope();
|
|
const Token* condTok = getCondTokFromEnd(endBlock);
|
|
if (scope && condTok)
|
|
programMemoryParseCondition(pm, condTok, nullptr, getSettings(), scope->type != Scope::eElse);
|
|
// ProgramMemory pm = pms.get(endBlock->link()->next(), getProgramState());
|
|
for (const auto& p:pm.values) {
|
|
nonneg int varid = p.first;
|
|
if (!symboldatabase->isVarId(varid))
|
|
continue;
|
|
ValueFlow::Value value = p.second;
|
|
if (vars.count(varid) != 0)
|
|
continue;
|
|
if (value.isImpossible())
|
|
continue;
|
|
value.setPossible();
|
|
values[varid] = value;
|
|
if (symboldatabase)
|
|
vars[varid] = symboldatabase->getVariableFromVarId(varid);
|
|
}
|
|
}
|
|
};
|
|
|
|
static void valueFlowInjectParameter(TokenList* tokenlist, SymbolDatabase* symboldatabase, ErrorLogger* errorLogger, const Settings* settings, const Scope* functionScope, const std::unordered_map<const Variable*, std::list<ValueFlow::Value>>& vars)
|
|
{
|
|
using Args = std::vector<std::unordered_map<const Variable*, ValueFlow::Value>>;
|
|
Args args(1);
|
|
// Compute cartesian product of all arguments
|
|
for (const auto& p:vars) {
|
|
if (p.second.empty())
|
|
continue;
|
|
args.back()[p.first] = p.second.front();
|
|
}
|
|
for (const auto& p:vars) {
|
|
if (args.size() > 256) {
|
|
std::string fname = "<unknown>";
|
|
Function* f = functionScope->function;
|
|
if (f)
|
|
fname = f->name();
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist, errorLogger, functionScope->bodyStart, "Too many argument passed to " + fname);
|
|
break;
|
|
}
|
|
std::for_each(std::next(p.second.begin()), p.second.end(), [&](const ValueFlow::Value& value) {
|
|
Args new_args;
|
|
for (auto arg:args) {
|
|
if (value.path != 0) {
|
|
for (const auto& q:arg) {
|
|
if (q.second.path == 0)
|
|
continue;
|
|
if (q.second.path != value.path)
|
|
return;
|
|
}
|
|
}
|
|
arg[p.first] = value;
|
|
new_args.push_back(arg);
|
|
}
|
|
std::copy(new_args.begin(), new_args.end(), std::back_inserter(args));
|
|
});
|
|
}
|
|
|
|
for (const auto& arg:args) {
|
|
if (arg.empty())
|
|
continue;
|
|
bool skip = false;
|
|
// Make sure all arguments are the same path
|
|
MathLib::bigint path = arg.begin()->second.path;
|
|
for (const auto& p:arg) {
|
|
if (p.second.path != path) {
|
|
skip = true;
|
|
break;
|
|
}
|
|
}
|
|
if (skip)
|
|
continue;
|
|
MultiValueFlowAnalyzer a(arg, tokenlist, symboldatabase);
|
|
valueFlowGenericForward(const_cast<Token*>(functionScope->bodyStart), functionScope->bodyEnd, a, settings);
|
|
}
|
|
}
|
|
|
|
static void valueFlowInjectParameter(TokenList* tokenlist, ErrorLogger* errorLogger, const Settings* settings, const Variable* arg, const Scope* functionScope, const std::list<ValueFlow::Value>& argvalues)
|
|
{
|
|
// Is argument passed by value or const reference, and is it a known non-class type?
|
|
if (arg->isReference() && !arg->isConst() && !arg->isClass())
|
|
return;
|
|
|
|
// Set value in function scope..
|
|
const nonneg int varid2 = arg->declarationId();
|
|
if (!varid2)
|
|
return;
|
|
|
|
valueFlowForwardVariable(const_cast<Token*>(functionScope->bodyStart->next()),
|
|
functionScope->bodyEnd,
|
|
arg,
|
|
varid2,
|
|
argvalues,
|
|
false,
|
|
true,
|
|
tokenlist,
|
|
errorLogger,
|
|
settings);
|
|
}
|
|
|
|
static void valueFlowSwitchVariable(TokenList *tokenlist, SymbolDatabase* symboldatabase, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
for (const Scope &scope : symboldatabase->scopeList) {
|
|
if (scope.type != Scope::ScopeType::eSwitch)
|
|
continue;
|
|
if (!Token::Match(scope.classDef, "switch ( %var% ) {"))
|
|
continue;
|
|
const Token *vartok = scope.classDef->tokAt(2);
|
|
const Variable *var = vartok->variable();
|
|
if (!var)
|
|
continue;
|
|
|
|
// bailout: global non-const variables
|
|
if (!(var->isLocal() || var->isArgument()) && !var->isConst()) {
|
|
if (settings->debugwarnings)
|
|
bailout(tokenlist, errorLogger, vartok, "switch variable " + var->name() + " is global");
|
|
continue;
|
|
}
|
|
|
|
for (Token *tok = scope.bodyStart->next(); tok != scope.bodyEnd; tok = tok->next()) {
|
|
if (tok->str() == "{") {
|
|
tok = tok->link();
|
|
continue;
|
|
}
|
|
if (Token::Match(tok, "case %num% :")) {
|
|
std::list<ValueFlow::Value> values;
|
|
values.emplace_back(MathLib::toLongNumber(tok->next()->str()));
|
|
values.back().condition = tok;
|
|
const std::string info("case " + tok->next()->str() + ": " + vartok->str() + " is " + tok->next()->str() + " here.");
|
|
values.back().errorPath.emplace_back(tok, info);
|
|
bool known = false;
|
|
if ((Token::simpleMatch(tok->previous(), "{") || Token::simpleMatch(tok->tokAt(-2), "break ;")) && !Token::Match(tok->tokAt(3), ";| case"))
|
|
known = true;
|
|
while (Token::Match(tok->tokAt(3), ";| case %num% :")) {
|
|
known = false;
|
|
tok = tok->tokAt(3);
|
|
if (!tok->isName())
|
|
tok = tok->next();
|
|
values.emplace_back(MathLib::toLongNumber(tok->next()->str()));
|
|
values.back().condition = tok;
|
|
const std::string info2("case " + tok->next()->str() + ": " + vartok->str() + " is " + tok->next()->str() + " here.");
|
|
values.back().errorPath.emplace_back(tok, info2);
|
|
}
|
|
for (std::list<ValueFlow::Value>::const_iterator val = values.begin(); val != values.end(); ++val) {
|
|
valueFlowReverse(tokenlist,
|
|
const_cast<Token*>(scope.classDef),
|
|
vartok,
|
|
*val,
|
|
ValueFlow::Value(),
|
|
errorLogger,
|
|
settings);
|
|
}
|
|
if (vartok->variable()->scope()) {
|
|
if (known)
|
|
values.back().setKnown();
|
|
|
|
// FIXME We must check if there is a return. See #9276
|
|
/*
|
|
valueFlowForwardVariable(tok->tokAt(3),
|
|
vartok->variable()->scope()->bodyEnd,
|
|
vartok->variable(),
|
|
vartok->varId(),
|
|
values,
|
|
values.back().isKnown(),
|
|
false,
|
|
tokenlist,
|
|
errorLogger,
|
|
settings);
|
|
*/
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void setTokenValues(Token *tok, const std::list<ValueFlow::Value> &values, const Settings *settings)
|
|
{
|
|
for (const ValueFlow::Value &value : values) {
|
|
if (value.isIntValue())
|
|
setTokenValue(tok, value, settings);
|
|
}
|
|
}
|
|
|
|
static bool evaluate(const Token *expr, const std::vector<std::list<ValueFlow::Value>> &values, std::list<ValueFlow::Value> *result)
|
|
{
|
|
if (!expr)
|
|
return false;
|
|
|
|
// strlen(arg)..
|
|
if (expr->str() == "(" && Token::Match(expr->previous(), "strlen ( %name% )")) {
|
|
const Token *arg = expr->next();
|
|
if (arg->str().compare(0,3,"arg") != 0 || arg->str().size() != 4)
|
|
return false;
|
|
const char n = arg->str()[3];
|
|
if (n < '1' || n - '1' >= values.size())
|
|
return false;
|
|
for (const ValueFlow::Value &argvalue : values[n - '1']) {
|
|
if (argvalue.isTokValue() && argvalue.tokvalue->tokType() == Token::eString) {
|
|
ValueFlow::Value res(argvalue); // copy all "inconclusive", "condition", etc attributes
|
|
// set return value..
|
|
res.valueType = ValueFlow::Value::ValueType::INT;
|
|
res.tokvalue = nullptr;
|
|
res.intvalue = Token::getStrLength(argvalue.tokvalue);
|
|
result->emplace_back(std::move(res));
|
|
}
|
|
}
|
|
return !result->empty();
|
|
}
|
|
|
|
// unary operands
|
|
if (expr->astOperand1() && !expr->astOperand2()) {
|
|
std::list<ValueFlow::Value> opvalues;
|
|
if (!evaluate(expr->astOperand1(), values, &opvalues))
|
|
return false;
|
|
if (expr->str() == "+") {
|
|
result->swap(opvalues);
|
|
return true;
|
|
}
|
|
if (expr->str() == "-") {
|
|
for (ValueFlow::Value v: opvalues) {
|
|
if (v.isIntValue()) {
|
|
v.intvalue = -v.intvalue;
|
|
result->emplace_back(std::move(v));
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
// binary/ternary operands
|
|
if (expr->astOperand1() && expr->astOperand2()) {
|
|
std::list<ValueFlow::Value> lhsValues, rhsValues;
|
|
if (!evaluate(expr->astOperand1(), values, &lhsValues))
|
|
return false;
|
|
if (expr->str() != "?" && !evaluate(expr->astOperand2(), values, &rhsValues))
|
|
return false;
|
|
|
|
for (const ValueFlow::Value &val1 : lhsValues) {
|
|
if (!val1.isIntValue())
|
|
continue;
|
|
if (expr->str() == "?") {
|
|
rhsValues.clear();
|
|
const Token *expr2 = val1.intvalue ? expr->astOperand2()->astOperand1() : expr->astOperand2()->astOperand2();
|
|
if (!evaluate(expr2, values, &rhsValues))
|
|
continue;
|
|
result->insert(result->end(), rhsValues.begin(), rhsValues.end());
|
|
continue;
|
|
}
|
|
|
|
for (const ValueFlow::Value &val2 : rhsValues) {
|
|
if (!val2.isIntValue())
|
|
continue;
|
|
|
|
if (val1.varId != 0 && val2.varId != 0) {
|
|
if (val1.varId != val2.varId || val1.varvalue != val2.varvalue)
|
|
continue;
|
|
}
|
|
|
|
if (expr->str() == "+")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue + val2.intvalue));
|
|
else if (expr->str() == "-")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue - val2.intvalue));
|
|
else if (expr->str() == "*")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue * val2.intvalue));
|
|
else if (expr->str() == "/" && val2.intvalue != 0)
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue / val2.intvalue));
|
|
else if (expr->str() == "%" && val2.intvalue != 0)
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue % val2.intvalue));
|
|
else if (expr->str() == "&")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue & val2.intvalue));
|
|
else if (expr->str() == "|")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue | val2.intvalue));
|
|
else if (expr->str() == "^")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue ^ val2.intvalue));
|
|
else if (expr->str() == "==")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue == val2.intvalue));
|
|
else if (expr->str() == "!=")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue != val2.intvalue));
|
|
else if (expr->str() == "<")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue < val2.intvalue));
|
|
else if (expr->str() == ">")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue > val2.intvalue));
|
|
else if (expr->str() == ">=")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue >= val2.intvalue));
|
|
else if (expr->str() == "<=")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue <= val2.intvalue));
|
|
else if (expr->str() == "&&")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue && val2.intvalue));
|
|
else if (expr->str() == "||")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue || val2.intvalue));
|
|
else if (expr->str() == "<<")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue << val2.intvalue));
|
|
else if (expr->str() == ">>")
|
|
result->emplace_back(ValueFlow::Value(val1.intvalue >> val2.intvalue));
|
|
else
|
|
return false;
|
|
combineValueProperties(val1, val2, &result->back());
|
|
}
|
|
}
|
|
return !result->empty();
|
|
}
|
|
if (expr->str().compare(0,3,"arg")==0) {
|
|
*result = values[expr->str()[3] - '1'];
|
|
return true;
|
|
}
|
|
if (expr->isNumber()) {
|
|
result->emplace_back(ValueFlow::Value(MathLib::toLongNumber(expr->str())));
|
|
result->back().setKnown();
|
|
return true;
|
|
} else if (expr->tokType() == Token::eChar) {
|
|
result->emplace_back(ValueFlow::Value(MathLib::toLongNumber(expr->str())));
|
|
result->back().setKnown();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static std::list<ValueFlow::Value> getFunctionArgumentValues(const Token *argtok)
|
|
{
|
|
std::list<ValueFlow::Value> argvalues(argtok->values());
|
|
removeImpossible(argvalues);
|
|
if (argvalues.empty() && Token::Match(argtok, "%comp%|%oror%|&&|!")) {
|
|
argvalues.emplace_back(0);
|
|
argvalues.emplace_back(1);
|
|
}
|
|
return argvalues;
|
|
}
|
|
|
|
static void valueFlowLibraryFunction(Token *tok, const std::string &returnValue, const Settings *settings)
|
|
{
|
|
std::vector<std::list<ValueFlow::Value>> argValues;
|
|
for (const Token *argtok : getArguments(tok->previous())) {
|
|
argValues.emplace_back(getFunctionArgumentValues(argtok));
|
|
if (argValues.back().empty())
|
|
return;
|
|
}
|
|
if (returnValue.find("arg") != std::string::npos && argValues.empty())
|
|
return;
|
|
|
|
TokenList tokenList(settings);
|
|
{
|
|
const std::string code = "return " + returnValue + ";";
|
|
std::istringstream istr(code);
|
|
if (!tokenList.createTokens(istr))
|
|
return;
|
|
}
|
|
|
|
// combine operators, set links, etc..
|
|
std::stack<Token *> lpar;
|
|
for (Token *tok2 = tokenList.front(); tok2; tok2 = tok2->next()) {
|
|
if (Token::Match(tok2, "[!<>=] =")) {
|
|
tok2->str(tok2->str() + "=");
|
|
tok2->deleteNext();
|
|
} else if (tok2->str() == "(")
|
|
lpar.push(tok2);
|
|
else if (tok2->str() == ")") {
|
|
if (lpar.empty())
|
|
return;
|
|
Token::createMutualLinks(lpar.top(), tok2);
|
|
lpar.pop();
|
|
}
|
|
}
|
|
if (!lpar.empty())
|
|
return;
|
|
|
|
// Evaluate expression
|
|
tokenList.createAst();
|
|
std::list<ValueFlow::Value> results;
|
|
if (evaluate(tokenList.front()->astOperand1(), argValues, &results))
|
|
setTokenValues(tok, results, settings);
|
|
}
|
|
|
|
static void valueFlowSubFunction(TokenList* tokenlist, SymbolDatabase* symboldatabase, ErrorLogger* errorLogger, const Settings* settings)
|
|
{
|
|
for (const Scope* scope : symboldatabase->functionScopes) {
|
|
const Function* function = scope->function;
|
|
if (!function)
|
|
continue;
|
|
int id = 0;
|
|
for (const Token *tok = scope->bodyStart; tok != scope->bodyEnd; tok = tok->next()) {
|
|
if (!Token::Match(tok, "%name% ("))
|
|
continue;
|
|
|
|
const Function * const calledFunction = tok->function();
|
|
if (!calledFunction) {
|
|
// library function?
|
|
const std::string& returnValue(settings->library.returnValue(tok));
|
|
if (!returnValue.empty())
|
|
valueFlowLibraryFunction(tok->next(), returnValue, settings);
|
|
continue;
|
|
}
|
|
|
|
const Scope * const calledFunctionScope = calledFunction->functionScope;
|
|
if (!calledFunctionScope)
|
|
continue;
|
|
|
|
id++;
|
|
std::unordered_map<const Variable*, std::list<ValueFlow::Value>> argvars;
|
|
// TODO: Rewrite this. It does not work well to inject 1 argument at a time.
|
|
const std::vector<const Token *> &callArguments = getArguments(tok);
|
|
for (int argnr = 0U; argnr < callArguments.size(); ++argnr) {
|
|
const Token *argtok = callArguments[argnr];
|
|
// Get function argument
|
|
const Variable * const argvar = calledFunction->getArgumentVar(argnr);
|
|
if (!argvar)
|
|
break;
|
|
|
|
// passing value(s) to function
|
|
std::list<ValueFlow::Value> argvalues(getFunctionArgumentValues(argtok));
|
|
|
|
// Remove non-local lifetimes
|
|
argvalues.remove_if([](const ValueFlow::Value& v) {
|
|
if (v.isLifetimeValue())
|
|
return !v.isLocalLifetimeValue() && !v.isSubFunctionLifetimeValue();
|
|
return false;
|
|
});
|
|
// Don't forward container sizes for now since programmemory can't evaluate conditions
|
|
argvalues.remove_if(std::mem_fn(&ValueFlow::Value::isContainerSizeValue));
|
|
|
|
if (argvalues.empty())
|
|
continue;
|
|
|
|
// Error path..
|
|
for (ValueFlow::Value &v : argvalues) {
|
|
const std::string nr = MathLib::toString(argnr + 1) + getOrdinalText(argnr + 1);
|
|
|
|
v.errorPath.emplace_back(argtok,
|
|
"Calling function '" +
|
|
calledFunction->name() +
|
|
"', " +
|
|
nr +
|
|
" argument '" +
|
|
argtok->expressionString() +
|
|
"' value is " +
|
|
v.infoString());
|
|
v.path = 256 * v.path + id;
|
|
// Change scope of lifetime values
|
|
if (v.isLifetimeValue())
|
|
v.lifetimeScope = ValueFlow::Value::LifetimeScope::SubFunction;
|
|
}
|
|
|
|
// passed values are not "known"..
|
|
lowerToPossible(argvalues);
|
|
|
|
argvars[argvar] = argvalues;
|
|
}
|
|
valueFlowInjectParameter(tokenlist, symboldatabase, errorLogger, settings, calledFunctionScope, argvars);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowFunctionDefaultParameter(TokenList *tokenlist, SymbolDatabase* symboldatabase, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
if (!tokenlist->isCPP())
|
|
return;
|
|
|
|
for (const Scope* scope : symboldatabase->functionScopes) {
|
|
const Function* function = scope->function;
|
|
if (!function)
|
|
continue;
|
|
for (std::size_t arg = function->minArgCount(); arg < function->argCount(); arg++) {
|
|
const Variable* var = function->getArgumentVar(arg);
|
|
if (var && var->hasDefault() && Token::Match(var->nameToken(), "%var% = %num%|%str% [,)]")) {
|
|
const std::list<ValueFlow::Value> &values = var->nameToken()->tokAt(2)->values();
|
|
std::list<ValueFlow::Value> argvalues;
|
|
for (const ValueFlow::Value &value : values) {
|
|
ValueFlow::Value v(value);
|
|
v.defaultArg = true;
|
|
v.changeKnownToPossible();
|
|
if (v.isPossible())
|
|
argvalues.push_back(v);
|
|
}
|
|
if (!argvalues.empty())
|
|
valueFlowInjectParameter(tokenlist, errorLogger, settings, var, scope, argvalues);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool isKnown(const Token * tok)
|
|
{
|
|
return tok && tok->hasKnownIntValue();
|
|
}
|
|
|
|
static void valueFlowFunctionReturn(TokenList *tokenlist, ErrorLogger *errorLogger)
|
|
{
|
|
for (Token *tok = tokenlist->back(); tok; tok = tok->previous()) {
|
|
if (tok->str() != "(" || !tok->astOperand1() || !tok->astOperand1()->function())
|
|
continue;
|
|
|
|
if (tok->hasKnownValue())
|
|
continue;
|
|
|
|
// Arguments..
|
|
std::vector<MathLib::bigint> parvalues;
|
|
if (tok->astOperand2()) {
|
|
const Token *partok = tok->astOperand2();
|
|
while (partok && partok->str() == "," && isKnown(partok->astOperand2()))
|
|
partok = partok->astOperand1();
|
|
if (!isKnown(partok))
|
|
continue;
|
|
parvalues.push_back(partok->values().front().intvalue);
|
|
partok = partok->astParent();
|
|
while (partok && partok->str() == ",") {
|
|
parvalues.push_back(partok->astOperand2()->values().front().intvalue);
|
|
partok = partok->astParent();
|
|
}
|
|
if (partok != tok)
|
|
continue;
|
|
}
|
|
|
|
// Get scope and args of function
|
|
const Function * const function = tok->astOperand1()->function();
|
|
const Scope * const functionScope = function->functionScope;
|
|
if (!functionScope || !Token::simpleMatch(functionScope->bodyStart, "{ return")) {
|
|
if (functionScope && tokenlist->getSettings()->debugwarnings && Token::findsimplematch(functionScope->bodyStart, "return", functionScope->bodyEnd))
|
|
bailout(tokenlist, errorLogger, tok, "function return; nontrivial function body");
|
|
continue;
|
|
}
|
|
|
|
ProgramMemory programMemory;
|
|
for (std::size_t i = 0; i < parvalues.size(); ++i) {
|
|
const Variable * const arg = function->getArgumentVar(i);
|
|
if (!arg || !Token::Match(arg->typeStartToken(), "%type% %name% ,|)")) {
|
|
if (tokenlist->getSettings()->debugwarnings)
|
|
bailout(tokenlist, errorLogger, tok, "function return; unhandled argument type");
|
|
programMemory.clear();
|
|
break;
|
|
}
|
|
programMemory.setIntValue(arg->declarationId(), parvalues[i]);
|
|
}
|
|
if (programMemory.empty() && !parvalues.empty())
|
|
continue;
|
|
|
|
// Determine return value of subfunction..
|
|
MathLib::bigint result = 0;
|
|
bool error = false;
|
|
execute(functionScope->bodyStart->next()->astOperand1(),
|
|
&programMemory,
|
|
&result,
|
|
&error);
|
|
if (!error) {
|
|
ValueFlow::Value v(result);
|
|
if (function->hasVirtualSpecifier())
|
|
v.setPossible();
|
|
else
|
|
v.setKnown();
|
|
setTokenValue(tok, v, tokenlist->getSettings());
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowUninit(TokenList *tokenlist, SymbolDatabase * /*symbolDatabase*/, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (!Token::Match(tok,"[;{}] %type%"))
|
|
continue;
|
|
if (!tok->scope()->isExecutable())
|
|
continue;
|
|
const Token *vardecl = tok->next();
|
|
bool stdtype = false;
|
|
bool pointer = false;
|
|
while (Token::Match(vardecl, "%name%|::|*") && vardecl->varId() == 0) {
|
|
stdtype |= vardecl->isStandardType();
|
|
pointer |= vardecl->str() == "*";
|
|
vardecl = vardecl->next();
|
|
}
|
|
// if (!stdtype && !pointer)
|
|
// continue;
|
|
if (!Token::Match(vardecl, "%var% ;"))
|
|
continue;
|
|
const Variable *var = vardecl->variable();
|
|
if (!var || var->nameToken() != vardecl || var->isInit())
|
|
continue;
|
|
if ((!var->isPointer() && var->type() && var->type()->needInitialization != Type::NeedInitialization::True) ||
|
|
!var->isLocal() || var->isStatic() || var->isExtern() || var->isReference() || var->isThrow())
|
|
continue;
|
|
if (!var->type() && !stdtype && !pointer)
|
|
continue;
|
|
|
|
ValueFlow::Value uninitValue;
|
|
uninitValue.setKnown();
|
|
uninitValue.valueType = ValueFlow::Value::ValueType::UNINIT;
|
|
uninitValue.tokvalue = vardecl;
|
|
std::list<ValueFlow::Value> values;
|
|
values.push_back(uninitValue);
|
|
|
|
const bool constValue = true;
|
|
const bool subFunction = false;
|
|
|
|
valueFlowForwardVariable(vardecl->next(),
|
|
vardecl->scope()->bodyEnd,
|
|
var,
|
|
vardecl->varId(),
|
|
values,
|
|
constValue,
|
|
subFunction,
|
|
tokenlist,
|
|
errorLogger,
|
|
settings);
|
|
}
|
|
}
|
|
|
|
static bool isContainerSize(const Token* tok)
|
|
{
|
|
if (!Token::Match(tok, "%var% . %name% ("))
|
|
return false;
|
|
if (!astIsContainer(tok))
|
|
return false;
|
|
if (tok->valueType()->container && tok->valueType()->container->getYield(tok->strAt(2)) == Library::Container::Yield::SIZE)
|
|
return true;
|
|
if (Token::Match(tok->tokAt(2), "size|length ( )"))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static bool isContainerEmpty(const Token* tok)
|
|
{
|
|
if (!Token::Match(tok, "%var% . %name% ("))
|
|
return false;
|
|
if (!astIsContainer(tok))
|
|
return false;
|
|
if (tok->valueType()->container && tok->valueType()->container->getYield(tok->strAt(2)) == Library::Container::Yield::EMPTY)
|
|
return true;
|
|
if (Token::simpleMatch(tok->tokAt(2), "empty ( )"))
|
|
return true;
|
|
return false;
|
|
}
|
|
static bool isContainerSizeChanged(const Token *tok, int depth=20);
|
|
|
|
static bool isContainerSizeChanged(nonneg int varId, const Token *start, const Token *end, int depth = 20);
|
|
|
|
static bool isContainerSizeChangedByFunction(const Token *tok, int depth = 20)
|
|
{
|
|
if (!tok->valueType() || !tok->valueType()->container)
|
|
return false;
|
|
// If we are accessing an element then we are not changing the container size
|
|
if (Token::Match(tok, "%name% . %name% (")) {
|
|
Library::Container::Yield yield = tok->valueType()->container->getYield(tok->strAt(2));
|
|
if (yield != Library::Container::Yield::NO_YIELD)
|
|
return false;
|
|
}
|
|
if (Token::simpleMatch(tok->astParent(), "["))
|
|
return false;
|
|
|
|
// address of variable
|
|
const bool addressOf = tok->valueType()->pointer || (tok->astParent() && tok->astParent()->isUnaryOp("&"));
|
|
|
|
int narg;
|
|
const Token * ftok = getTokenArgumentFunction(tok, narg);
|
|
if (!ftok)
|
|
return false; // not a function => variable not changed
|
|
const Function * fun = ftok->function();
|
|
if (fun && !fun->hasVirtualSpecifier()) {
|
|
const Variable *arg = fun->getArgumentVar(narg);
|
|
if (arg) {
|
|
if (!arg->isReference() && !addressOf)
|
|
return false;
|
|
if (!addressOf && arg->isConst())
|
|
return false;
|
|
if (arg->valueType() && arg->valueType()->constness == 1)
|
|
return false;
|
|
const Scope * scope = fun->functionScope;
|
|
if (scope) {
|
|
// Argument not used
|
|
if (!arg->nameToken())
|
|
return false;
|
|
if (depth > 0)
|
|
return isContainerSizeChanged(arg->declarationId(), scope->bodyStart, scope->bodyEnd, depth - 1);
|
|
}
|
|
// Don't know => Safe guess
|
|
return true;
|
|
}
|
|
}
|
|
|
|
bool inconclusive = false;
|
|
const bool isChanged = isVariableChangedByFunctionCall(tok, 0, nullptr, &inconclusive);
|
|
return (isChanged || inconclusive);
|
|
}
|
|
|
|
struct ContainerVariableAnalyzer : VariableAnalyzer {
|
|
ContainerVariableAnalyzer() : VariableAnalyzer() {}
|
|
|
|
ContainerVariableAnalyzer(const Variable* v,
|
|
const ValueFlow::Value& val,
|
|
std::vector<const Variable*> paliases,
|
|
const TokenList* t)
|
|
: VariableAnalyzer(v, val, std::move(paliases), t)
|
|
{}
|
|
|
|
virtual bool match(const Token* tok) const OVERRIDE {
|
|
return tok->varId() == var->declarationId() || (astIsIterator(tok) && isAliasOf(tok, var->declarationId()));
|
|
}
|
|
|
|
virtual Action isWritable(const Token* tok, Direction d) const OVERRIDE {
|
|
if (astIsIterator(tok))
|
|
return Action::None;
|
|
if (d == Direction::Reverse)
|
|
return Action::None;
|
|
const ValueFlow::Value* value = getValue(tok);
|
|
if (!value)
|
|
return Action::None;
|
|
if (!tok->valueType() || !tok->valueType()->container)
|
|
return Action::None;
|
|
const Token* parent = tok->astParent();
|
|
|
|
if (tok->valueType()->container->stdStringLike && Token::simpleMatch(parent, "+=") && astIsLHS(tok) && parent->astOperand2()) {
|
|
const Token* rhs = parent->astOperand2();
|
|
if (rhs->tokType() == Token::eString)
|
|
return Action::Read | Action::Write | Action::Incremental;
|
|
if (rhs->valueType() && rhs->valueType()->container && rhs->valueType()->container->stdStringLike) {
|
|
if (std::any_of(rhs->values().begin(), rhs->values().end(), [&](const ValueFlow::Value &rhsval) {
|
|
return rhsval.isKnown() && rhsval.isContainerSizeValue();
|
|
}))
|
|
return Action::Read | Action::Write | Action::Incremental;
|
|
}
|
|
} else if (Token::Match(tok, "%name% . %name% (")) {
|
|
Library::Container::Action action = tok->valueType()->container->getAction(tok->strAt(2));
|
|
if (action == Library::Container::Action::PUSH || action == Library::Container::Action::POP) {
|
|
std::vector<const Token*> args = getArguments(tok->tokAt(3));
|
|
if (args.size() < 2)
|
|
return Action::Read | Action::Write | Action::Incremental;
|
|
}
|
|
}
|
|
return Action::None;
|
|
}
|
|
|
|
virtual void writeValue(ValueFlow::Value* value, const Token* tok, Direction d) const OVERRIDE {
|
|
if (d == Direction::Reverse)
|
|
return;
|
|
if (!value)
|
|
return;
|
|
if (!tok->astParent())
|
|
return;
|
|
const Token* parent = tok->astParent();
|
|
if (!tok->valueType() || !tok->valueType()->container)
|
|
return;
|
|
|
|
if (tok->valueType()->container->stdStringLike && Token::simpleMatch(parent, "+=") && parent->astOperand2()) {
|
|
const Token* rhs = parent->astOperand2();
|
|
if (rhs->tokType() == Token::eString)
|
|
value->intvalue += Token::getStrLength(rhs);
|
|
else if (rhs->valueType() && rhs->valueType()->container && rhs->valueType()->container->stdStringLike) {
|
|
for (const ValueFlow::Value &rhsval : rhs->values()) {
|
|
if (rhsval.isKnown() && rhsval.isContainerSizeValue()) {
|
|
value->intvalue += rhsval.intvalue;
|
|
}
|
|
}
|
|
}
|
|
} else if (Token::Match(tok, "%name% . %name% (")) {
|
|
Library::Container::Action action = tok->valueType()->container->getAction(tok->strAt(2));
|
|
if (action == Library::Container::Action::PUSH)
|
|
value->intvalue++;
|
|
if (action == Library::Container::Action::POP)
|
|
value->intvalue--;
|
|
}
|
|
}
|
|
|
|
virtual Action isModified(const Token* tok) const OVERRIDE {
|
|
Action read = Action::Read;
|
|
// An iterator won't change the container size
|
|
if (astIsIterator(tok))
|
|
return read;
|
|
if (Token::Match(tok->astParent(), "%assign%") && astIsLHS(tok))
|
|
return Action::Invalid;
|
|
if (isLikelyStreamRead(isCPP(), tok->astParent()))
|
|
return Action::Invalid;
|
|
if (astIsContainer(tok) && isContainerSizeChanged(tok))
|
|
return Action::Invalid;
|
|
return read;
|
|
}
|
|
};
|
|
|
|
static Analyzer::Action valueFlowContainerForward(Token* tok,
|
|
const Token* endToken,
|
|
const Variable* var,
|
|
ValueFlow::Value value,
|
|
TokenList* tokenlist)
|
|
{
|
|
ContainerVariableAnalyzer a(var, value, getAliasesFromValues({value}), tokenlist);
|
|
return valueFlowGenericForward(tok, endToken, a, tokenlist->getSettings());
|
|
}
|
|
static Analyzer::Action valueFlowContainerForward(Token* tok,
|
|
const Variable* var,
|
|
ValueFlow::Value value,
|
|
TokenList* tokenlist)
|
|
{
|
|
const Token * endOfVarScope = nullptr;
|
|
if (var->isLocal() || var->isArgument())
|
|
endOfVarScope = var->scope()->bodyEnd;
|
|
if (!endOfVarScope)
|
|
endOfVarScope = tok->scope()->bodyEnd;
|
|
return valueFlowContainerForward(tok, endOfVarScope, var, std::move(value), tokenlist);
|
|
}
|
|
|
|
static void valueFlowContainerReverse(Token* tok,
|
|
const Token* const endToken,
|
|
const Token* const varToken,
|
|
const std::list<ValueFlow::Value>& values,
|
|
TokenList* tokenlist,
|
|
const Settings* settings)
|
|
{
|
|
const Variable* var = varToken->variable();
|
|
auto aliases = getAliasesFromValues(values);
|
|
for (const ValueFlow::Value& value : values) {
|
|
ContainerVariableAnalyzer a(var, value, aliases, tokenlist);
|
|
valueFlowGenericReverse(tok, endToken, a, settings);
|
|
}
|
|
}
|
|
|
|
static void valueFlowContainerReverse(Token* tok,
|
|
const Token* const varToken,
|
|
const std::list<ValueFlow::Value>& values,
|
|
TokenList* tokenlist,
|
|
const Settings* settings)
|
|
{
|
|
valueFlowContainerReverse(tok, nullptr, varToken, values, tokenlist, settings);
|
|
}
|
|
|
|
static bool isContainerSizeChanged(const Token *tok, int depth)
|
|
{
|
|
if (!tok)
|
|
return false;
|
|
if (!tok->valueType() || !tok->valueType()->container)
|
|
return true;
|
|
if (Token::Match(tok, "%name% %assign%|<<"))
|
|
return true;
|
|
if (Token::Match(tok, "%var% [") && tok->valueType()->container->stdAssociativeLike)
|
|
return true;
|
|
if (Token::Match(tok, "%name% . %name% (")) {
|
|
Library::Container::Action action = tok->valueType()->container->getAction(tok->strAt(2));
|
|
Library::Container::Yield yield = tok->valueType()->container->getYield(tok->strAt(2));
|
|
switch (action) {
|
|
case Library::Container::Action::RESIZE:
|
|
case Library::Container::Action::CLEAR:
|
|
case Library::Container::Action::PUSH:
|
|
case Library::Container::Action::POP:
|
|
case Library::Container::Action::CHANGE:
|
|
case Library::Container::Action::INSERT:
|
|
case Library::Container::Action::ERASE:
|
|
case Library::Container::Action::CHANGE_INTERNAL:
|
|
return true;
|
|
case Library::Container::Action::NO_ACTION: // might be unknown action
|
|
return yield == Library::Container::Yield::NO_YIELD;
|
|
case Library::Container::Action::FIND:
|
|
case Library::Container::Action::CHANGE_CONTENT:
|
|
break;
|
|
}
|
|
}
|
|
if (isContainerSizeChangedByFunction(tok, depth))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static bool isContainerSizeChanged(nonneg int varId, const Token *start, const Token *end, int depth)
|
|
{
|
|
for (const Token *tok = start; tok != end; tok = tok->next()) {
|
|
if (tok->varId() != varId)
|
|
continue;
|
|
if (isContainerSizeChanged(tok, depth))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void valueFlowSmartPointer(TokenList *tokenlist, ErrorLogger * errorLogger, const Settings *settings)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (!tok->scope())
|
|
continue;
|
|
if (!tok->scope()->isExecutable())
|
|
continue;
|
|
if (tok->variable()) {
|
|
const Variable* var = tok->variable();
|
|
if (!var->isSmartPointer())
|
|
continue;
|
|
if (var->nameToken() == tok) {
|
|
if (Token::Match(tok, "%var% (|{") && tok->next()->astOperand2() &&
|
|
tok->next()->astOperand2()->str() != ",") {
|
|
Token* inTok = tok->next()->astOperand2();
|
|
std::list<ValueFlow::Value> values = inTok->values();
|
|
const bool constValue = inTok->isNumber();
|
|
valueFlowForwardAssign(inTok, var, values, constValue, true, tokenlist, errorLogger, settings);
|
|
|
|
} else if (Token::Match(tok, "%var% ;")) {
|
|
std::list<ValueFlow::Value> values;
|
|
ValueFlow::Value v(0);
|
|
v.setKnown();
|
|
values.push_back(v);
|
|
valueFlowForwardAssign(tok, var, values, false, true, tokenlist, errorLogger, settings);
|
|
}
|
|
} else if (Token::Match(tok, "%var% . reset (") && tok->next()->originalName() != "->") {
|
|
if (Token::simpleMatch(tok->tokAt(3), "( )")) {
|
|
std::list<ValueFlow::Value> values;
|
|
ValueFlow::Value v(0);
|
|
v.setKnown();
|
|
values.push_back(v);
|
|
valueFlowForwardAssign(tok->tokAt(4), var, values, false, false, tokenlist, errorLogger, settings);
|
|
} else {
|
|
tok->removeValues(std::mem_fn(&ValueFlow::Value::isIntValue));
|
|
Token* inTok = tok->tokAt(3)->astOperand2();
|
|
if (!inTok)
|
|
continue;
|
|
std::list<ValueFlow::Value> values = inTok->values();
|
|
const bool constValue = inTok->isNumber();
|
|
valueFlowForwardAssign(inTok, var, values, constValue, false, tokenlist, errorLogger, settings);
|
|
}
|
|
} else if (Token::Match(tok, "%var% . release ( )") && tok->next()->originalName() != "->") {
|
|
std::list<ValueFlow::Value> values;
|
|
ValueFlow::Value v(0);
|
|
v.setKnown();
|
|
values.push_back(v);
|
|
valueFlowForwardAssign(tok->tokAt(4), var, values, false, false, tokenlist, errorLogger, settings);
|
|
}
|
|
} else if (Token::Match(tok->previous(), "%name%|> (|{") && astIsSmartPointer(tok) &&
|
|
astIsSmartPointer(tok->astOperand1())) {
|
|
std::vector<const Token*> args = getArguments(tok);
|
|
if (args.empty())
|
|
continue;
|
|
for (const ValueFlow::Value& v : args.front()->values())
|
|
setTokenValue(tok, v, settings);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowIterators(TokenList *tokenlist, const Settings *settings)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (!tok->scope())
|
|
continue;
|
|
if (!tok->scope()->isExecutable())
|
|
continue;
|
|
if (!astIsContainer(tok))
|
|
continue;
|
|
if (Token::Match(tok->astParent(), ". %name% (")) {
|
|
Library::Container::Yield yield = tok->valueType()->container->getYield(tok->astParent()->strAt(1));
|
|
ValueFlow::Value v(0);
|
|
v.setKnown();
|
|
if (yield == Library::Container::Yield::START_ITERATOR) {
|
|
v.valueType = ValueFlow::Value::ValueType::ITERATOR_START;
|
|
setTokenValue(tok->astParent()->tokAt(2), v, settings);
|
|
} else if (yield == Library::Container::Yield::END_ITERATOR) {
|
|
v.valueType = ValueFlow::Value::ValueType::ITERATOR_END;
|
|
setTokenValue(tok->astParent()->tokAt(2), v, settings);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static std::list<ValueFlow::Value> getIteratorValues(std::list<ValueFlow::Value> values, ValueFlow::Value::ValueKind* kind = nullptr)
|
|
{
|
|
values.remove_if([&](const ValueFlow::Value& v) {
|
|
if (kind && v.valueKind != *kind)
|
|
return true;
|
|
return !v.isIteratorValue();
|
|
});
|
|
return values;
|
|
}
|
|
|
|
struct IteratorConditionHandler : SimpleConditionHandler {
|
|
virtual Condition parse(const Token* tok, const Settings*) const OVERRIDE {
|
|
Condition cond;
|
|
|
|
ValueFlow::Value true_value;
|
|
ValueFlow::Value false_value;
|
|
|
|
if (Token::Match(tok, "==|!=")) {
|
|
if (!tok->astOperand1() || !tok->astOperand2())
|
|
return cond;
|
|
|
|
ValueFlow::Value::ValueKind kind = ValueFlow::Value::ValueKind::Known;
|
|
std::list<ValueFlow::Value> values = getIteratorValues(tok->astOperand1()->values(), &kind);
|
|
if (!values.empty()) {
|
|
cond.vartok = tok->astOperand2();
|
|
} else {
|
|
values = getIteratorValues(tok->astOperand2()->values());
|
|
if (!values.empty())
|
|
cond.vartok = tok->astOperand1();
|
|
}
|
|
for (ValueFlow::Value& v:values) {
|
|
v.setPossible();
|
|
v.assumeCondition(tok);
|
|
}
|
|
cond.true_values = values;
|
|
cond.false_values = values;
|
|
}
|
|
|
|
return cond;
|
|
}
|
|
};
|
|
|
|
static void valueFlowIteratorInfer(TokenList *tokenlist, const Settings *settings)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (!tok->scope())
|
|
continue;
|
|
if (!tok->scope()->isExecutable())
|
|
continue;
|
|
std::list<ValueFlow::Value> values = getIteratorValues(tok->values());
|
|
values.remove_if([&](const ValueFlow::Value& v) {
|
|
if (!v.isImpossible())
|
|
return true;
|
|
if (v.isIteratorEndValue() && v.intvalue <= 0)
|
|
return true;
|
|
if (v.isIteratorStartValue() && v.intvalue >= 0)
|
|
return true;
|
|
return false;
|
|
});
|
|
for (ValueFlow::Value& v:values) {
|
|
v.setPossible();
|
|
if (v.isIteratorStartValue())
|
|
v.intvalue++;
|
|
if (v.isIteratorEndValue())
|
|
v.intvalue--;
|
|
setTokenValue(tok, v, settings);
|
|
}
|
|
}
|
|
}
|
|
|
|
static std::vector<ValueFlow::Value> getInitListSize(const Token* tok, const Library::Container *container)
|
|
{
|
|
std::vector<const Token*> args = getArguments(tok);
|
|
if ((args.size() == 1 && astIsContainer(args[0]) && args[0]->valueType()->container == container) ||
|
|
(args.size() == 2 && astIsIterator(args[0]) && astIsIterator(args[1]))) {
|
|
std::vector<ValueFlow::Value> values;
|
|
std::copy_if(args[0]->values().begin(),
|
|
args[0]->values().end(),
|
|
std::back_inserter(values),
|
|
std::mem_fn(&ValueFlow::Value::isContainerSizeValue));
|
|
return values;
|
|
}
|
|
ValueFlow::Value value(args.size());
|
|
value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
value.setKnown();
|
|
return {value};
|
|
}
|
|
|
|
static void valueFlowContainerSize(TokenList *tokenlist, SymbolDatabase* symboldatabase, ErrorLogger * /*errorLogger*/, const Settings *settings)
|
|
{
|
|
// declaration
|
|
for (const Variable *var : symboldatabase->variableList()) {
|
|
if (!var || !var->isLocal() || var->isPointer() || var->isReference() || var->isStatic())
|
|
continue;
|
|
if (!var->valueType() || !var->valueType()->container)
|
|
continue;
|
|
if (!astIsContainer(var->nameToken()))
|
|
continue;
|
|
if (var->nameToken()->hasKnownValue())
|
|
continue;
|
|
if (!Token::Match(var->nameToken(), "%name% ;") &&
|
|
!(Token::Match(var->nameToken(), "%name% {") && Token::simpleMatch(var->nameToken()->next()->link(), "} ;")))
|
|
continue;
|
|
std::vector<ValueFlow::Value> values{ValueFlow::Value{0}};
|
|
values.back().valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
values.back().setKnown();
|
|
if (var->valueType()->container->size_templateArgNo >= 0) {
|
|
if (var->dimensions().size() == 1 && var->dimensions().front().known)
|
|
values.back().intvalue = var->dimensions().front().num;
|
|
else
|
|
continue;
|
|
} else if (Token::simpleMatch(var->nameToken()->next(), "{")) {
|
|
const Token* initList = var->nameToken()->next();
|
|
values = getInitListSize(initList, var->valueType()->container);
|
|
}
|
|
for (const ValueFlow::Value& value : values)
|
|
valueFlowContainerForward(var->nameToken()->next(), var, value, tokenlist);
|
|
}
|
|
|
|
// after assignment
|
|
for (const Scope *functionScope : symboldatabase->functionScopes) {
|
|
for (const Token *tok = functionScope->bodyStart; tok != functionScope->bodyEnd; tok = tok->next()) {
|
|
if (Token::Match(tok, "%name%|;|{|} %var% = %str% ;")) {
|
|
const Token *containerTok = tok->next();
|
|
if (containerTok && containerTok->valueType() && containerTok->valueType()->container && containerTok->valueType()->container->stdStringLike) {
|
|
ValueFlow::Value value(Token::getStrLength(containerTok->tokAt(2)));
|
|
value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
value.setKnown();
|
|
valueFlowContainerForward(containerTok->next(), containerTok->variable(), value, tokenlist);
|
|
}
|
|
} else if (Token::Match(tok, "%name%|;|{|}|> %var% = {") && Token::simpleMatch(tok->linkAt(3), "} ;")) {
|
|
const Token* containerTok = tok->next();
|
|
if (astIsContainer(containerTok)) {
|
|
std::vector<ValueFlow::Value> values = getInitListSize(tok->tokAt(3), containerTok->valueType()->container);
|
|
for (const ValueFlow::Value& value : values)
|
|
valueFlowContainerForward(containerTok->next(), containerTok->variable(), value, tokenlist);
|
|
}
|
|
} else if (Token::Match(tok, "%var% . %name% (") && tok->valueType() && tok->valueType()->container) {
|
|
Library::Container::Action action = tok->valueType()->container->getAction(tok->strAt(2));
|
|
if (action == Library::Container::Action::CLEAR) {
|
|
ValueFlow::Value value(0);
|
|
value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
value.setKnown();
|
|
valueFlowContainerForward(tok->next(), tok->variable(), value, tokenlist);
|
|
} else if (action == Library::Container::Action::RESIZE && tok->tokAt(4)->hasKnownIntValue()) {
|
|
ValueFlow::Value value(tok->tokAt(4)->values().front());
|
|
value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
value.setKnown();
|
|
valueFlowContainerForward(tok->next(), tok->variable(), value, tokenlist);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// conditional conditionSize
|
|
for (const Scope &scope : symboldatabase->scopeList) {
|
|
if (scope.type != Scope::ScopeType::eIf) // TODO: while
|
|
continue;
|
|
for (const Token *tok = scope.classDef; tok && tok->str() != "{"; tok = tok->next()) {
|
|
if (!tok->isName() || !tok->valueType() || tok->valueType()->type != ValueType::CONTAINER || !tok->valueType()->container)
|
|
continue;
|
|
|
|
const Token *conditionToken;
|
|
MathLib::bigint intval;
|
|
|
|
if (Token::Match(tok, "%name% . %name% (")) {
|
|
if (tok->valueType()->container->getYield(tok->strAt(2)) == Library::Container::Yield::SIZE) {
|
|
const Token *parent = tok->tokAt(3)->astParent();
|
|
if (!parent || !parent->isComparisonOp() || !parent->astOperand2())
|
|
continue;
|
|
if (parent->astOperand1()->hasKnownIntValue())
|
|
intval = parent->astOperand1()->values().front().intvalue;
|
|
else if (parent->astOperand2()->hasKnownIntValue())
|
|
intval = parent->astOperand2()->values().front().intvalue;
|
|
else
|
|
continue;
|
|
conditionToken = parent;
|
|
} else if (tok->valueType()->container->getYield(tok->strAt(2)) == Library::Container::Yield::EMPTY) {
|
|
conditionToken = tok->tokAt(3);
|
|
intval = 0;
|
|
} else {
|
|
continue;
|
|
}
|
|
} else if (tok->valueType()->container->stdStringLike && Token::Match(tok, "%name% ==|!= %str%") && tok->next()->astOperand2() == tok->tokAt(2)) {
|
|
intval = Token::getStrLength(tok->tokAt(2));
|
|
conditionToken = tok->next();
|
|
} else {
|
|
continue;
|
|
}
|
|
|
|
ValueFlow::Value value(conditionToken, intval);
|
|
value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
|
|
// possible value before condition
|
|
valueFlowContainerReverse(const_cast<Token*>(scope.classDef), tok, {value}, tokenlist, settings);
|
|
}
|
|
}
|
|
}
|
|
|
|
struct ContainerConditionHandler : ConditionHandler {
|
|
virtual bool forward(Token* start,
|
|
const Token* stop,
|
|
const Token* exprTok,
|
|
const std::list<ValueFlow::Value>& values,
|
|
TokenList* tokenlist,
|
|
const Settings*) const OVERRIDE {
|
|
// TODO: Forward multiple values
|
|
if (values.empty())
|
|
return false;
|
|
const Variable* var = exprTok->variable();
|
|
if (!var)
|
|
return false;
|
|
return valueFlowContainerForward(start->next(), stop, var, values.front(), tokenlist).isModified();
|
|
}
|
|
|
|
virtual void reverse(Token* start,
|
|
const Token* endTok,
|
|
const Token* exprTok,
|
|
const std::list<ValueFlow::Value>& values,
|
|
TokenList* tokenlist,
|
|
const Settings* settings) const OVERRIDE {
|
|
if (values.empty())
|
|
return;
|
|
if (!exprTok->variable())
|
|
return;
|
|
return valueFlowContainerReverse(start, endTok, exprTok, values, tokenlist, settings);
|
|
}
|
|
|
|
virtual Condition parse(const Token* tok, const Settings*) const OVERRIDE {
|
|
Condition cond;
|
|
ValueFlow::Value true_value;
|
|
ValueFlow::Value false_value;
|
|
const Token *vartok = parseCompareInt(tok, true_value, false_value);
|
|
if (vartok) {
|
|
vartok = vartok->tokAt(-3);
|
|
if (!isContainerSize(vartok))
|
|
return cond;
|
|
true_value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
false_value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
cond.true_values.push_back(true_value);
|
|
cond.false_values.push_back(false_value);
|
|
cond.vartok = vartok;
|
|
return cond;
|
|
}
|
|
|
|
// Empty check
|
|
if (tok->str() == "(") {
|
|
vartok = tok->tokAt(-3);
|
|
// TODO: Handle .size()
|
|
if (!isContainerEmpty(vartok))
|
|
return cond;
|
|
const Token *parent = tok->astParent();
|
|
while (parent) {
|
|
if (Token::Match(parent, "%comp%"))
|
|
return cond;
|
|
parent = parent->astParent();
|
|
}
|
|
ValueFlow::Value value(tok, 0LL);
|
|
value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
cond.true_values.emplace_back(value);
|
|
cond.false_values.emplace_back(std::move(value));
|
|
cond.vartok = vartok;
|
|
cond.inverted = true;
|
|
return cond;
|
|
}
|
|
// String compare
|
|
if (Token::Match(tok, "==|!=")) {
|
|
const Token *strtok = nullptr;
|
|
if (Token::Match(tok->astOperand1(), "%str%")) {
|
|
strtok = tok->astOperand1();
|
|
vartok = tok->astOperand2();
|
|
} else if (Token::Match(tok->astOperand2(), "%str%")) {
|
|
strtok = tok->astOperand2();
|
|
vartok = tok->astOperand1();
|
|
}
|
|
if (!strtok)
|
|
return cond;
|
|
if (!astIsContainer(vartok))
|
|
return cond;
|
|
ValueFlow::Value value(tok, Token::getStrLength(strtok));
|
|
value.valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
cond.false_values.emplace_back(value);
|
|
cond.true_values.emplace_back(std::move(value));
|
|
cond.vartok = vartok;
|
|
return cond;
|
|
}
|
|
return cond;
|
|
}
|
|
};
|
|
|
|
static void valueFlowDynamicBufferSize(TokenList *tokenlist, SymbolDatabase *symboldatabase, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
for (const Scope *functionScope : symboldatabase->functionScopes) {
|
|
for (const Token *tok = functionScope->bodyStart; tok != functionScope->bodyEnd; tok = tok->next()) {
|
|
if (!Token::Match(tok, "[;{}] %var% ="))
|
|
continue;
|
|
|
|
if (!tok->next()->variable())
|
|
continue;
|
|
|
|
const Token *rhs = tok->tokAt(2)->astOperand2();
|
|
while (rhs && rhs->isCast())
|
|
rhs = rhs->astOperand2() ? rhs->astOperand2() : rhs->astOperand1();
|
|
if (!rhs)
|
|
continue;
|
|
|
|
if (!Token::Match(rhs->previous(), "%name% ("))
|
|
continue;
|
|
|
|
const Library::AllocFunc *allocFunc = settings->library.getAllocFuncInfo(rhs->previous());
|
|
if (!allocFunc)
|
|
allocFunc = settings->library.getReallocFuncInfo(rhs->previous());
|
|
if (!allocFunc || allocFunc->bufferSize == Library::AllocFunc::BufferSize::none)
|
|
continue;
|
|
|
|
const std::vector<const Token *> args = getArguments(rhs->previous());
|
|
|
|
const Token * const arg1 = (args.size() >= allocFunc->bufferSizeArg1) ? args[allocFunc->bufferSizeArg1 - 1] : nullptr;
|
|
const Token * const arg2 = (args.size() >= allocFunc->bufferSizeArg2) ? args[allocFunc->bufferSizeArg2 - 1] : nullptr;
|
|
|
|
MathLib::bigint sizeValue = -1;
|
|
switch (allocFunc->bufferSize) {
|
|
case Library::AllocFunc::BufferSize::none:
|
|
break;
|
|
case Library::AllocFunc::BufferSize::malloc:
|
|
if (arg1 && arg1->hasKnownIntValue())
|
|
sizeValue = arg1->getKnownIntValue();
|
|
break;
|
|
case Library::AllocFunc::BufferSize::calloc:
|
|
if (arg1 && arg2 && arg1->hasKnownIntValue() && arg2->hasKnownIntValue())
|
|
sizeValue = arg1->getKnownIntValue() * arg2->getKnownIntValue();
|
|
break;
|
|
case Library::AllocFunc::BufferSize::strdup:
|
|
if (arg1 && arg1->hasKnownValue()) {
|
|
const ValueFlow::Value &value = arg1->values().back();
|
|
if (value.isTokValue() && value.tokvalue->tokType() == Token::eString)
|
|
sizeValue = Token::getStrLength(value.tokvalue) + 1; // Add one for the null terminator
|
|
}
|
|
break;
|
|
}
|
|
if (sizeValue < 0)
|
|
continue;
|
|
|
|
ValueFlow::Value value(sizeValue);
|
|
value.errorPath.emplace_back(tok->tokAt(2), "Assign " + tok->strAt(1) + ", buffer with size " + MathLib::toString(sizeValue));
|
|
value.valueType = ValueFlow::Value::ValueType::BUFFER_SIZE;
|
|
value.setKnown();
|
|
const std::list<ValueFlow::Value> values{value};
|
|
valueFlowForwardVariable(const_cast<Token*>(rhs),
|
|
functionScope->bodyEnd,
|
|
tok->next()->variable(),
|
|
tok->next()->varId(),
|
|
values,
|
|
true,
|
|
false,
|
|
tokenlist,
|
|
errorLogger,
|
|
settings);
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool getMinMaxValues(const ValueType *vt, const cppcheck::Platform &platform, MathLib::bigint *minValue, MathLib::bigint *maxValue)
|
|
{
|
|
if (!vt || !vt->isIntegral() || vt->pointer)
|
|
return false;
|
|
|
|
int bits;
|
|
switch (vt->type) {
|
|
case ValueType::Type::BOOL:
|
|
bits = 1;
|
|
break;
|
|
case ValueType::Type::CHAR:
|
|
bits = platform.char_bit;
|
|
break;
|
|
case ValueType::Type::SHORT:
|
|
bits = platform.short_bit;
|
|
break;
|
|
case ValueType::Type::INT:
|
|
bits = platform.int_bit;
|
|
break;
|
|
case ValueType::Type::LONG:
|
|
bits = platform.long_bit;
|
|
break;
|
|
case ValueType::Type::LONGLONG:
|
|
bits = platform.long_long_bit;
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
if (bits == 1) {
|
|
*minValue = 0;
|
|
*maxValue = 1;
|
|
} else if (bits < 62) {
|
|
if (vt->sign == ValueType::Sign::UNSIGNED) {
|
|
*minValue = 0;
|
|
*maxValue = (1LL << bits) - 1;
|
|
} else {
|
|
*minValue = -(1LL << (bits - 1));
|
|
*maxValue = (1LL << (bits - 1)) - 1;
|
|
}
|
|
} else if (bits == 64) {
|
|
if (vt->sign == ValueType::Sign::UNSIGNED) {
|
|
*minValue = 0;
|
|
*maxValue = LLONG_MAX; // todo max unsigned value
|
|
} else {
|
|
*minValue = LLONG_MIN;
|
|
*maxValue = LLONG_MAX;
|
|
}
|
|
} else {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool getMinMaxValues(const std::string &typestr, const Settings *settings, MathLib::bigint *minvalue, MathLib::bigint *maxvalue)
|
|
{
|
|
TokenList typeTokens(settings);
|
|
std::istringstream istr(typestr+";");
|
|
if (!typeTokens.createTokens(istr))
|
|
return false;
|
|
typeTokens.simplifyPlatformTypes();
|
|
typeTokens.simplifyStdType();
|
|
const ValueType &vt = ValueType::parseDecl(typeTokens.front(), settings);
|
|
return getMinMaxValues(&vt, *settings, minvalue, maxvalue);
|
|
}
|
|
|
|
static void valueFlowSafeFunctions(TokenList *tokenlist, SymbolDatabase *symboldatabase, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
for (const Scope *functionScope : symboldatabase->functionScopes) {
|
|
if (!functionScope->bodyStart)
|
|
continue;
|
|
const Function *function = functionScope->function;
|
|
if (!function)
|
|
continue;
|
|
|
|
const bool safe = function->isSafe(settings);
|
|
const bool all = safe && settings->platformType != cppcheck::Platform::PlatformType::Unspecified;
|
|
|
|
for (const Variable &arg : function->argumentList) {
|
|
if (!arg.nameToken() || !arg.valueType())
|
|
continue;
|
|
|
|
if (arg.valueType()->type == ValueType::Type::CONTAINER) {
|
|
if (!safe)
|
|
continue;
|
|
std::list<ValueFlow::Value> argValues;
|
|
argValues.emplace_back(0);
|
|
argValues.back().valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
argValues.back().errorPath.emplace_back(arg.nameToken(), "Assuming " + arg.name() + " is empty");
|
|
argValues.back().safe = true;
|
|
argValues.emplace_back(1000000);
|
|
argValues.back().valueType = ValueFlow::Value::ValueType::CONTAINER_SIZE;
|
|
argValues.back().errorPath.emplace_back(arg.nameToken(), "Assuming " + arg.name() + " size is 1000000");
|
|
argValues.back().safe = true;
|
|
for (const ValueFlow::Value &value : argValues)
|
|
valueFlowContainerForward(const_cast<Token*>(functionScope->bodyStart), &arg, value, tokenlist);
|
|
continue;
|
|
}
|
|
|
|
MathLib::bigint low, high;
|
|
bool isLow = arg.nameToken()->getCppcheckAttribute(TokenImpl::CppcheckAttributes::Type::LOW, &low);
|
|
bool isHigh = arg.nameToken()->getCppcheckAttribute(TokenImpl::CppcheckAttributes::Type::HIGH, &high);
|
|
|
|
if (!isLow && !isHigh && !all)
|
|
continue;
|
|
|
|
const bool safeLow = !isLow;
|
|
const bool safeHigh = !isHigh;
|
|
|
|
if ((!isLow || !isHigh) && all) {
|
|
MathLib::bigint minValue, maxValue;
|
|
if (getMinMaxValues(arg.valueType(), *settings, &minValue, &maxValue)) {
|
|
if (!isLow)
|
|
low = minValue;
|
|
if (!isHigh)
|
|
high = maxValue;
|
|
isLow = isHigh = true;
|
|
} else if (arg.valueType()->type == ValueType::Type::FLOAT || arg.valueType()->type == ValueType::Type::DOUBLE || arg.valueType()->type == ValueType::Type::LONGDOUBLE) {
|
|
std::list<ValueFlow::Value> argValues;
|
|
argValues.emplace_back(0);
|
|
argValues.back().valueType = ValueFlow::Value::ValueType::FLOAT;
|
|
argValues.back().floatValue = isLow ? low : -1E25f;
|
|
argValues.back().errorPath.emplace_back(arg.nameToken(), "Safe checks: Assuming argument has value " + MathLib::toString(argValues.back().floatValue));
|
|
argValues.back().safe = true;
|
|
argValues.emplace_back(0);
|
|
argValues.back().valueType = ValueFlow::Value::ValueType::FLOAT;
|
|
argValues.back().floatValue = isHigh ? high : 1E25f;
|
|
argValues.back().errorPath.emplace_back(arg.nameToken(), "Safe checks: Assuming argument has value " + MathLib::toString(argValues.back().floatValue));
|
|
argValues.back().safe = true;
|
|
valueFlowForwardVariable(const_cast<Token*>(functionScope->bodyStart->next()),
|
|
functionScope->bodyEnd,
|
|
&arg,
|
|
arg.declarationId(),
|
|
argValues,
|
|
false,
|
|
false,
|
|
tokenlist,
|
|
errorLogger,
|
|
settings);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
std::list<ValueFlow::Value> argValues;
|
|
if (isLow) {
|
|
argValues.emplace_back(low);
|
|
argValues.back().errorPath.emplace_back(arg.nameToken(), std::string(safeLow ? "Safe checks: " : "") + "Assuming argument has value " + MathLib::toString(low));
|
|
argValues.back().safe = safeLow;
|
|
}
|
|
if (isHigh) {
|
|
argValues.emplace_back(high);
|
|
argValues.back().errorPath.emplace_back(arg.nameToken(), std::string(safeHigh ? "Safe checks: " : "") + "Assuming argument has value " + MathLib::toString(high));
|
|
argValues.back().safe = safeHigh;
|
|
}
|
|
|
|
if (!argValues.empty())
|
|
valueFlowForwardVariable(const_cast<Token*>(functionScope->bodyStart->next()),
|
|
functionScope->bodyEnd,
|
|
&arg,
|
|
arg.declarationId(),
|
|
argValues,
|
|
false,
|
|
false,
|
|
tokenlist,
|
|
errorLogger,
|
|
settings);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void valueFlowUnknownFunctionReturn(TokenList *tokenlist, const Settings *settings)
|
|
{
|
|
if (settings->checkUnknownFunctionReturn.empty())
|
|
return;
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
|
|
if (!tok->astParent() || tok->str() != "(" || !tok->previous()->isName())
|
|
continue;
|
|
if (settings->checkUnknownFunctionReturn.find(tok->previous()->str()) == settings->checkUnknownFunctionReturn.end())
|
|
continue;
|
|
std::vector<MathLib::bigint> unknownValues = settings->library.unknownReturnValues(tok->astOperand1());
|
|
if (unknownValues.empty())
|
|
continue;
|
|
|
|
// Get min/max values for return type
|
|
const std::string &typestr = settings->library.returnValueType(tok->previous());
|
|
MathLib::bigint minvalue, maxvalue;
|
|
if (!getMinMaxValues(typestr, settings, &minvalue, &maxvalue))
|
|
continue;
|
|
|
|
for (MathLib::bigint value : unknownValues) {
|
|
if (value < minvalue)
|
|
value = minvalue;
|
|
else if (value > maxvalue)
|
|
value = maxvalue;
|
|
setTokenValue(const_cast<Token *>(tok), ValueFlow::Value(value), settings);
|
|
}
|
|
}
|
|
}
|
|
|
|
ValueFlow::Value::Value(const Token* c, long long val)
|
|
: valueType(ValueType::INT),
|
|
bound(Bound::Point),
|
|
intvalue(val),
|
|
tokvalue(nullptr),
|
|
floatValue(0.0),
|
|
moveKind(MoveKind::NonMovedVariable),
|
|
varvalue(val),
|
|
condition(c),
|
|
varId(0),
|
|
safe(false),
|
|
conditional(false),
|
|
defaultArg(false),
|
|
indirect(0),
|
|
path(0),
|
|
lifetimeKind(LifetimeKind::Object),
|
|
lifetimeScope(LifetimeScope::Local),
|
|
valueKind(ValueKind::Possible)
|
|
{
|
|
errorPath.emplace_back(c, "Assuming that condition '" + c->expressionString() + "' is not redundant");
|
|
}
|
|
|
|
void ValueFlow::Value::assumeCondition(const Token* tok)
|
|
{
|
|
condition = tok;
|
|
errorPath.emplace_back(tok, "Assuming that condition '" + tok->expressionString() + "' is not redundant");
|
|
}
|
|
|
|
std::string ValueFlow::Value::infoString() const
|
|
{
|
|
switch (valueType) {
|
|
case ValueType::INT:
|
|
return MathLib::toString(intvalue);
|
|
case ValueType::TOK:
|
|
return tokvalue->str();
|
|
case ValueType::FLOAT:
|
|
return MathLib::toString(floatValue);
|
|
case ValueType::MOVED:
|
|
return "<Moved>";
|
|
case ValueType::UNINIT:
|
|
return "<Uninit>";
|
|
case ValueType::BUFFER_SIZE:
|
|
case ValueType::CONTAINER_SIZE:
|
|
return "size=" + MathLib::toString(intvalue);
|
|
case ValueType::ITERATOR_START:
|
|
return "start=" + MathLib::toString(intvalue);
|
|
case ValueType::ITERATOR_END:
|
|
return "end=" + MathLib::toString(intvalue);
|
|
case ValueType::LIFETIME:
|
|
return "lifetime=" + tokvalue->str();
|
|
}
|
|
throw InternalError(nullptr, "Invalid ValueFlow Value type");
|
|
}
|
|
|
|
const char* ValueFlow::Value::toString(MoveKind moveKind)
|
|
{
|
|
switch (moveKind) {
|
|
case MoveKind::NonMovedVariable:
|
|
return "NonMovedVariable";
|
|
case MoveKind::MovedVariable:
|
|
return "MovedVariable";
|
|
case MoveKind::ForwardedVariable:
|
|
return "ForwardedVariable";
|
|
}
|
|
return "";
|
|
}
|
|
|
|
|
|
const ValueFlow::Value *ValueFlow::valueFlowConstantFoldAST(Token *expr, const Settings *settings)
|
|
{
|
|
if (expr && expr->values().empty()) {
|
|
valueFlowConstantFoldAST(expr->astOperand1(), settings);
|
|
valueFlowConstantFoldAST(expr->astOperand2(), settings);
|
|
valueFlowSetConstantValue(expr, settings, true /* TODO: this is a guess */);
|
|
}
|
|
return expr && expr->hasKnownValue() ? &expr->values().front() : nullptr;
|
|
}
|
|
|
|
static std::size_t getTotalValues(TokenList *tokenlist)
|
|
{
|
|
std::size_t n = 1;
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next())
|
|
n += tok->values().size();
|
|
return n;
|
|
}
|
|
|
|
void ValueFlow::setValues(TokenList *tokenlist, SymbolDatabase* symboldatabase, ErrorLogger *errorLogger, const Settings *settings)
|
|
{
|
|
for (Token *tok = tokenlist->front(); tok; tok = tok->next())
|
|
tok->clearValueFlow();
|
|
|
|
valueFlowEnumValue(symboldatabase, settings);
|
|
valueFlowNumber(tokenlist);
|
|
valueFlowString(tokenlist);
|
|
valueFlowArray(tokenlist);
|
|
valueFlowUnknownFunctionReturn(tokenlist, settings);
|
|
valueFlowGlobalConstVar(tokenlist, settings);
|
|
valueFlowEnumValue(symboldatabase, settings);
|
|
valueFlowNumber(tokenlist);
|
|
valueFlowGlobalStaticVar(tokenlist, settings);
|
|
valueFlowPointerAlias(tokenlist);
|
|
valueFlowLifetime(tokenlist, symboldatabase, errorLogger, settings);
|
|
valueFlowBitAnd(tokenlist);
|
|
valueFlowSameExpressions(tokenlist);
|
|
valueFlowConditionExpressions(tokenlist, symboldatabase, errorLogger, settings);
|
|
|
|
std::size_t values = 0;
|
|
std::size_t n = 4;
|
|
while (n > 0 && values < getTotalValues(tokenlist)) {
|
|
values = getTotalValues(tokenlist);
|
|
valueFlowPointerAliasDeref(tokenlist);
|
|
valueFlowArrayBool(tokenlist);
|
|
valueFlowRightShift(tokenlist, settings);
|
|
valueFlowAfterMove(tokenlist, symboldatabase, errorLogger, settings);
|
|
valueFlowCondition(SimpleConditionHandler{}, tokenlist, symboldatabase, errorLogger, settings);
|
|
valueFlowInferCondition(tokenlist, settings);
|
|
valueFlowAfterAssign(tokenlist, symboldatabase, errorLogger, settings);
|
|
valueFlowSwitchVariable(tokenlist, symboldatabase, errorLogger, settings);
|
|
valueFlowForLoop(tokenlist, symboldatabase, errorLogger, settings);
|
|
valueFlowSubFunction(tokenlist, symboldatabase, errorLogger, settings);
|
|
valueFlowFunctionReturn(tokenlist, errorLogger);
|
|
valueFlowLifetime(tokenlist, symboldatabase, errorLogger, settings);
|
|
valueFlowFunctionDefaultParameter(tokenlist, symboldatabase, errorLogger, settings);
|
|
valueFlowUninit(tokenlist, symboldatabase, errorLogger, settings);
|
|
if (tokenlist->isCPP()) {
|
|
valueFlowSmartPointer(tokenlist, errorLogger, settings);
|
|
valueFlowIterators(tokenlist, settings);
|
|
valueFlowCondition(IteratorConditionHandler{}, tokenlist, symboldatabase, errorLogger, settings);
|
|
valueFlowIteratorInfer(tokenlist, settings);
|
|
valueFlowContainerSize(tokenlist, symboldatabase, errorLogger, settings);
|
|
valueFlowCondition(ContainerConditionHandler{}, tokenlist, symboldatabase, errorLogger, settings);
|
|
}
|
|
valueFlowSafeFunctions(tokenlist, symboldatabase, errorLogger, settings);
|
|
n--;
|
|
}
|
|
|
|
valueFlowDynamicBufferSize(tokenlist, symboldatabase, errorLogger, settings);
|
|
}
|
|
|
|
|
|
std::string ValueFlow::eitherTheConditionIsRedundant(const Token *condition)
|
|
{
|
|
if (!condition)
|
|
return "Either the condition is redundant";
|
|
if (condition->str() == "case") {
|
|
std::string expr;
|
|
for (const Token *tok = condition; tok && tok->str() != ":"; tok = tok->next()) {
|
|
expr += tok->str();
|
|
if (Token::Match(tok, "%name%|%num% %name%|%num%"))
|
|
expr += ' ';
|
|
}
|
|
return "Either the switch case '" + expr + "' is redundant";
|
|
}
|
|
return "Either the condition '" + condition->expressionString() + "' is redundant";
|
|
}
|