318 lines
11 KiB
C++
318 lines
11 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2019 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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#ifndef astutilsH
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#define astutilsH
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//---------------------------------------------------------------------------
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#include <functional>
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#include <string>
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#include <vector>
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#include "errorlogger.h"
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#include "utils.h"
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class Library;
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class Settings;
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class Scope;
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class Token;
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class Variable;
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enum class ChildrenToVisit {
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none,
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op1,
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op2,
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op1_and_op2,
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done // found what we looked for, don't visit any more children
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};
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/**
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* Visit AST nodes recursively. The order is not "well defined"
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*/
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void visitAstNodes(const Token *ast, std::function<ChildrenToVisit(const Token *)> visitor);
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std::vector<const Token*> astFlatten(const Token* tok, const char* op);
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bool astHasToken(const Token* root, const Token * tok);
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bool astHasVar(const Token * tok, nonneg int varid);
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/** Is expression a 'signed char' if no promotion is used */
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bool astIsSignedChar(const Token *tok);
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/** Is expression a 'char' if no promotion is used? */
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bool astIsUnknownSignChar(const Token *tok);
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/** Is expression of integral type? */
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bool astIsIntegral(const Token *tok, bool unknown);
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/** Is expression of floating point type? */
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bool astIsFloat(const Token *tok, bool unknown);
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/** Is expression of boolean type? */
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bool astIsBool(const Token *tok);
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bool astIsPointer(const Token *tok);
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bool astIsIterator(const Token *tok);
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bool astIsContainer(const Token *tok);
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/**
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* Get canonical type of expression. const/static/etc are not included and neither *&.
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* For example:
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* Expression type Return
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* std::string std::string
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* int * int
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* static const int int
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* std::vector<T> std::vector
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*/
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std::string astCanonicalType(const Token *expr);
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/** Is given syntax tree a variable comparison against value */
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const Token * astIsVariableComparison(const Token *tok, const std::string &comp, const std::string &rhs, const Token **vartok=nullptr);
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const Token * nextAfterAstRightmostLeaf(const Token * tok);
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Token* astParentSkipParens(Token* tok);
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const Token* astParentSkipParens(const Token* tok);
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bool precedes(const Token * tok1, const Token * tok2);
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bool isSameExpression(bool cpp, bool macro, const Token *tok1, const Token *tok2, const Library& library, bool pure, bool followVar, ErrorPath* errors=nullptr);
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bool isEqualKnownValue(const Token * const tok1, const Token * const tok2);
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bool isDifferentKnownValues(const Token * const tok1, const Token * const tok2);
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/**
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* Are two conditions opposite
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* @param isNot do you want to know if cond1 is !cond2 or if cond1 and cond2 are non-overlapping. true: cond1==!cond2 false: cond1==true => cond2==false
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* @param cpp c++ file
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* @param cond1 condition1
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* @param cond2 condition2
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* @param library files data
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* @param pure boolean
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*/
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bool isOppositeCond(bool isNot, bool cpp, const Token * const cond1, const Token * const cond2, const Library& library, bool pure, bool followVar, ErrorPath* errors=nullptr);
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bool isOppositeExpression(bool cpp, const Token * const tok1, const Token * const tok2, const Library& library, bool pure, bool followVar, ErrorPath* errors=nullptr);
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bool isConstExpression(const Token *tok, const Library& library, bool pure, bool cpp);
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bool isWithoutSideEffects(bool cpp, const Token* tok);
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bool isUniqueExpression(const Token* tok);
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/** Is scope a return scope (scope will unconditionally return) */
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bool isReturnScope(const Token *endToken, const Settings * settings = nullptr, bool functionScope=false);
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/// Return the token to the function and the argument number
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const Token * getTokenArgumentFunction(const Token * tok, int& argn);
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/** Is variable changed by function call?
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* In case the answer of the question is inconclusive, e.g. because the function declaration is not known
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* the return value is false and the output parameter inconclusive is set to true
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*
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* @param tok ast tree
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* @param varid Variable Id
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* @param settings program settings
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* @param inconclusive pointer to output variable which indicates that the answer of the question is inconclusive
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*/
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bool isVariableChangedByFunctionCall(const Token *tok, int indirect, nonneg int varid, const Settings *settings, bool *inconclusive);
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/** Is variable changed by function call?
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* In case the answer of the question is inconclusive, e.g. because the function declaration is not known
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* the return value is false and the output parameter inconclusive is set to true
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*
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* @param tok token of variable in function call
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* @param settings program settings
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* @param inconclusive pointer to output variable which indicates that the answer of the question is inconclusive
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*/
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bool isVariableChangedByFunctionCall(const Token *tok, int indirect, const Settings *settings, bool *inconclusive);
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/** Is variable changed in block of code? */
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bool isVariableChanged(const Token *start, const Token *end, const nonneg int varid, bool globalvar, const Settings *settings, bool cpp, int depth = 20);
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bool isVariableChanged(const Token *tok, int indirect, const Settings *settings, bool cpp, int depth = 20);
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bool isVariableChanged(const Variable * var, const Settings *settings, bool cpp, int depth = 20);
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const Token* findVariableChanged(const Token *start, const Token *end, int indirect, const nonneg int varid, bool globalvar, const Settings *settings, bool cpp, int depth = 20);
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Token* findVariableChanged(Token *start, const Token *end, int indirect, const nonneg int varid, bool globalvar, const Settings *settings, bool cpp, int depth = 20);
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bool isAliased(const Variable *var);
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/** Determines the number of arguments - if token is a function call or macro
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* @param start token which is supposed to be the function/macro name.
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* \return Number of arguments
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*/
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int numberOfArguments(const Token *start);
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/**
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* Get arguments (AST)
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*/
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std::vector<const Token *> getArguments(const Token *ftok);
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const Token *findLambdaStartToken(const Token *last);
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/**
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* find lambda function end token
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* \param first The [ token
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* \return nullptr or the }
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*/
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const Token *findLambdaEndToken(const Token *first);
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bool isLikelyStream(bool cpp, const Token *stream);
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/**
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* do we see a likely write of rhs through overloaded operator
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* s >> x;
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* a & x;
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*/
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bool isLikelyStreamRead(bool cpp, const Token *op);
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bool isCPPCast(const Token* tok);
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bool isConstVarExpression(const Token *tok);
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const Variable *getLHSVariable(const Token *tok);
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bool isScopeBracket(const Token* tok);
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struct PathAnalysis {
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enum class Progress {
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Continue,
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Break
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};
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PathAnalysis(const Token* start, const Library& library)
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: start(start), library(&library)
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{}
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const Token * start;
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const Library * library;
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struct Info {
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const Token* tok;
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ErrorPath errorPath;
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bool known;
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};
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void forward(const std::function<Progress(const Info&)>& f) const;
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template<class F>
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void forwardAll(F f) {
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forward([&](const Info& info) {
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f(info);
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return Progress::Continue;
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});
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}
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template<class Predicate>
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Info forwardFind(Predicate pred) {
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Info result{};
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forward([&](const Info& info) {
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if (pred(info)) {
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result = info;
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return Progress::Break;
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}
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return Progress::Continue;
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});
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return result;
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}
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private:
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Progress forwardRecursive(const Token* tok, Info info, const std::function<PathAnalysis::Progress(const Info&)>& f) const;
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Progress forwardRange(const Token* startToken, const Token* endToken, Info info, const std::function<Progress(const Info&)>& f) const;
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static const Scope* findOuterScope(const Scope * scope);
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static std::pair<bool, bool> checkCond(const Token * tok, bool& known);
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};
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/**
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* @brief Returns true if there is a path between the two tokens
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*
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* @param start Starting point of the path
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* @param dest The path destination
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* @param errorPath Adds the path traversal to the errorPath
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*/
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bool reaches(const Token * start, const Token * dest, const Library& library, ErrorPath* errorPath);
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/**
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* Forward data flow analysis for checks
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* - unused value
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* - redundant assignment
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* - valueflow analysis
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*/
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class FwdAnalysis {
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public:
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FwdAnalysis(bool cpp, const Library &library) : mCpp(cpp), mLibrary(library), mWhat(What::Reassign), mValueFlowKnown(true) {}
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bool hasOperand(const Token *tok, const Token *lhs) const;
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/**
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* Check if "expr" is reassigned. The "expr" can be a tree (x.y[12]).
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* @param expr Symbolic expression to perform forward analysis for
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* @param startToken First token in forward analysis
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* @param endToken Last token in forward analysis
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* @return Token where expr is reassigned. If it's not reassigned then nullptr is returned.
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*/
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const Token *reassign(const Token *expr, const Token *startToken, const Token *endToken);
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/**
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* Check if "expr" is used. The "expr" can be a tree (x.y[12]).
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* @param expr Symbolic expression to perform forward analysis for
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* @param startToken First token in forward analysis
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* @param endToken Last token in forward analysis
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* @return true if expr is used.
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*/
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bool unusedValue(const Token *expr, const Token *startToken, const Token *endToken);
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struct KnownAndToken {
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bool known;
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const Token *token;
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};
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std::vector<KnownAndToken> valueFlow(const Token *expr, const Token *startToken, const Token *endToken);
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/** Is there some possible alias for given expression */
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bool possiblyAliased(const Token *expr, const Token *startToken) const;
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static bool isNullOperand(const Token *expr);
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private:
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static bool isEscapedAlias(const Token* expr);
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/** Result of forward analysis */
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struct Result {
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enum class Type { NONE, READ, WRITE, BREAK, RETURN, BAILOUT } type;
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explicit Result(Type type) : type(type), token(nullptr) {}
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Result(Type type, const Token *token) : type(type), token(token) {}
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const Token *token;
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};
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struct Result check(const Token *expr, const Token *startToken, const Token *endToken);
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struct Result checkRecursive(const Token *expr, const Token *startToken, const Token *endToken, const std::set<int> &exprVarIds, bool local, bool inInnerClass);
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// Is expression a l-value global data?
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bool isGlobalData(const Token *expr) const;
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const bool mCpp;
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const Library &mLibrary;
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enum class What { Reassign, UnusedValue, ValueFlow } mWhat;
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std::vector<KnownAndToken> mValueFlow;
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bool mValueFlowKnown;
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};
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#endif // astutilsH
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