264 lines
9.4 KiB
C++
264 lines
9.4 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2018 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 checkstlH
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#define checkstlH
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//---------------------------------------------------------------------------
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#include "check.h"
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#include "config.h"
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#include "library.h"
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#include "tokenize.h"
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#include <map>
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#include <string>
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class ErrorLogger;
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class Scope;
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class Settings;
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class Token;
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class Variable;
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/// @addtogroup Checks
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/// @{
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/** @brief %Check STL usage (invalidation of iterators, mismatching containers, etc) */
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class CPPCHECKLIB CheckStl : public Check {
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public:
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/** This constructor is used when registering the CheckClass */
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CheckStl() : Check(myName()) {
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}
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/** This constructor is used when running checks. */
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CheckStl(const Tokenizer* tokenizer, const Settings* settings, ErrorLogger* errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger) {
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}
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/** Simplified checks. The token list is simplified. */
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void runSimplifiedChecks(const Tokenizer* tokenizer, const Settings* settings, ErrorLogger* errorLogger) {
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if (!tokenizer->isCPP()) {
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return;
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}
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CheckStl checkStl(tokenizer, settings, errorLogger);
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checkStl.stlOutOfBounds();
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checkStl.negativeIndex();
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checkStl.iterators();
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checkStl.mismatchingContainers();
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checkStl.erase();
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checkStl.pushback();
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checkStl.stlBoundaries();
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checkStl.if_find();
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checkStl.string_c_str();
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checkStl.checkAutoPointer();
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checkStl.uselessCalls();
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checkStl.checkDereferenceInvalidIterator();
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// Style check
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checkStl.size();
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checkStl.redundantCondition();
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checkStl.missingComparison();
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checkStl.readingEmptyStlContainer();
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}
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/**
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* Finds errors like this:
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* for (unsigned ii = 0; ii <= foo.size(); ++ii)
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*/
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void stlOutOfBounds();
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/**
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* negative index for array like containers
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*/
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void negativeIndex();
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/**
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* Finds errors like this:
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* for (it = foo.begin(); it != bar.end(); ++it)
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*/
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void iterators();
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/**
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* Mismatching containers:
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* std::find(foo.begin(), bar.end(), x)
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*/
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void mismatchingContainers();
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/**
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* Dangerous usage of erase. The iterator is invalidated by erase so
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* it is bad to dereference it after the erase.
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*/
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void erase();
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void eraseCheckLoopVar(const Scope& scope, const Variable* var);
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/**
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* Dangerous usage of push_back and insert
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*/
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void pushback();
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/**
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* bad condition.. "it < alist.end()"
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*/
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void stlBoundaries();
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/** if (a.find(x)) - possibly incorrect condition */
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void if_find();
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/**
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* Suggest using empty() instead of checking size() against zero for containers.
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* Item 4 from Scott Meyers book "Effective STL".
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*/
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void size();
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/**
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* Check for redundant condition 'if (ints.find(1) != ints.end()) ints.remove(123);'
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* */
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void redundantCondition();
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/**
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* @brief Missing inner comparison, when incrementing iterator inside loop
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* Dangers:
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* - may increment iterator beyond end
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* - may unintentionally skip elements in list/set etc
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*/
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void missingComparison();
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/** Check for common mistakes when using the function string::c_str() */
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void string_c_str();
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/** @brief %Check for use and copy auto pointer */
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void checkAutoPointer();
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/** @brief %Check calls that using them is useless */
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void uselessCalls();
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/** @brief %Check for dereferencing an iterator that is invalid */
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void checkDereferenceInvalidIterator();
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/**
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* Dereferencing an erased iterator
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* @param erased token where the erase occurs
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* @param deref token where the dereference occurs
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* @param itername iterator name
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* @param inconclusive inconclusive flag
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*/
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void dereferenceErasedError(const Token* erased, const Token* deref, const std::string& itername, bool inconclusive);
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/** @brief Reading from empty stl container */
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void readingEmptyStlContainer();
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private:
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void readingEmptyStlContainer_parseUsage(const Token* tok, const Library::Container* container, std::map<unsigned int, const Library::Container*>& empty, bool noerror);
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void missingComparisonError(const Token* incrementToken1, const Token* incrementToken2);
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void string_c_strThrowError(const Token* tok);
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void string_c_strError(const Token* tok);
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void string_c_strReturn(const Token* tok);
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void string_c_strParam(const Token* tok, unsigned int number);
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void stlOutOfBoundsError(const Token* tok, const std::string& num, const std::string& var, bool at);
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void negativeIndexError(const Token* tok, const ValueFlow::Value& index);
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void invalidIteratorError(const Token* tok, const std::string& iteratorName);
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void iteratorsError(const Token* tok, const std::string& container1, const std::string& container2);
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void mismatchingContainersError(const Token* tok);
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void invalidIteratorError(const Token* tok, const std::string& func, const std::string& iterator_name);
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void invalidPointerError(const Token* tok, const std::string& func, const std::string& pointer_name);
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void stlBoundariesError(const Token* tok);
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void if_findError(const Token* tok, bool str);
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void sizeError(const Token* tok);
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void redundantIfRemoveError(const Token* tok);
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void autoPointerError(const Token* tok);
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void autoPointerContainerError(const Token* tok);
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void autoPointerArrayError(const Token* tok);
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void autoPointerMallocError(const Token* tok, const std::string& allocFunction);
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void uselessCallsReturnValueError(const Token* tok, const std::string& varname, const std::string& function);
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void uselessCallsSwapError(const Token* tok, const std::string& varname);
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void uselessCallsSubstrError(const Token* tok, bool empty);
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void uselessCallsEmptyError(const Token* tok);
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void uselessCallsRemoveError(const Token* tok, const std::string& function);
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void dereferenceInvalidIteratorError(const Token* deref, const std::string& iterName);
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void readingEmptyStlContainerError(const Token* tok);
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void getErrorMessages(ErrorLogger* errorLogger, const Settings* settings) const {
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CheckStl c(nullptr, settings, errorLogger);
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c.invalidIteratorError(nullptr, "iterator");
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c.iteratorsError(nullptr, "container1", "container2");
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c.mismatchingContainersError(nullptr);
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c.dereferenceErasedError(nullptr, nullptr, "iter", false);
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c.stlOutOfBoundsError(nullptr, "i", "foo", false);
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c.negativeIndexError(nullptr, ValueFlow::Value(-1));
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c.invalidIteratorError(nullptr, "push_back|push_front|insert", "iterator");
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c.invalidPointerError(nullptr, "push_back", "pointer");
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c.stlBoundariesError(nullptr);
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c.if_findError(nullptr, false);
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c.if_findError(nullptr, true);
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c.string_c_strError(nullptr);
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c.string_c_strReturn(nullptr);
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c.string_c_strParam(nullptr, 0);
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c.sizeError(nullptr);
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c.missingComparisonError(nullptr, nullptr);
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c.redundantIfRemoveError(nullptr);
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c.autoPointerError(nullptr);
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c.autoPointerContainerError(nullptr);
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c.autoPointerArrayError(nullptr);
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c.autoPointerMallocError(nullptr, "malloc");
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c.uselessCallsReturnValueError(nullptr, "str", "find");
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c.uselessCallsSwapError(nullptr, "str");
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c.uselessCallsSubstrError(nullptr, false);
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c.uselessCallsEmptyError(nullptr);
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c.uselessCallsRemoveError(nullptr, "remove");
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c.dereferenceInvalidIteratorError(nullptr, "i");
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c.readingEmptyStlContainerError(nullptr);
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}
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static std::string myName() {
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return "STL usage";
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}
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std::string classInfo() const {
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return "Check for invalid usage of STL:\n"
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"- out of bounds errors\n"
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"- misuse of iterators when iterating through a container\n"
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"- mismatching containers in calls\n"
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"- dereferencing an erased iterator\n"
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"- for vectors: using iterator/pointer after push_back has been used\n"
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"- optimisation: use empty() instead of size() to guarantee fast code\n"
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"- suspicious condition when using find\n"
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"- redundant condition\n"
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"- common mistakes when using string::c_str()\n"
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"- using auto pointer (auto_ptr)\n"
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"- useless calls of string and STL functions\n"
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"- dereferencing an invalid iterator\n"
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"- reading from empty STL container\n";
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}
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // checkstlH
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