308 lines
12 KiB
C++
308 lines
12 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2022 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 "errortypes.h"
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#include "tokenize.h"
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#include "vfvalue.h"
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#include <string>
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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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class ErrorLogger;
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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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/** 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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/** run checks, the token list is not simplified */
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void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) override {
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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.erase();
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checkStl.if_find();
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checkStl.checkFindInsert();
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checkStl.iterators();
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checkStl.missingComparison();
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checkStl.outOfBounds();
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checkStl.outOfBoundsIndexExpression();
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checkStl.redundantCondition();
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checkStl.string_c_str();
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checkStl.uselessCalls();
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checkStl.useStlAlgorithm();
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checkStl.stlOutOfBounds();
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checkStl.negativeIndex();
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checkStl.invalidContainer();
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checkStl.mismatchingContainers();
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checkStl.mismatchingContainerIterator();
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checkStl.knownEmptyContainer();
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checkStl.stlBoundaries();
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checkStl.checkDereferenceInvalidIterator();
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checkStl.checkDereferenceInvalidIterator2();
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checkStl.checkMutexes();
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// Style check
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checkStl.size();
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}
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/** Accessing container out of bounds using ValueFlow */
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void outOfBounds();
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/** Accessing container out of bounds, following index expression */
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void outOfBoundsIndexExpression();
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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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void invalidContainer();
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bool checkIteratorPair(const Token* tok1, const Token* tok2);
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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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void mismatchingContainerIterator();
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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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* 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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void checkFindInsert();
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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 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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void checkDereferenceInvalidIterator2();
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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 Look for loops that can replaced with std algorithms */
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void useStlAlgorithm();
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void knownEmptyContainer();
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void checkMutexes();
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private:
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bool isContainerSize(const Token *containerToken, const Token *expr) const;
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bool isContainerSizeGE(const Token * containerToken, const Token *expr) const;
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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, nonneg int number);
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void string_c_strConstructor(const Token* tok);
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void string_c_strAssignment(const Token* tok);
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void string_c_strConcat(const Token* tok);
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void string_c_strStream(const Token* tok);
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void outOfBoundsError(const Token *tok, const std::string &containerName, const ValueFlow::Value *containerSize, const std::string &index, const ValueFlow::Value *indexValue);
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void outOfBoundsIndexExpressionError(const Token *tok, const Token *index);
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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& containerName1, const std::string& containerName2);
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void iteratorsError(const Token* tok, const Token* containerTok, const std::string& containerName1, const std::string& containerName2);
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void iteratorsError(const Token* tok, const Token* containerTok, const std::string& containerName);
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void mismatchingContainerIteratorError(const Token* tok, const Token* iterTok);
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void mismatchingContainersError(const Token* tok1, const Token* tok2);
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void mismatchingContainerExpressionError(const Token *tok1, const Token *tok2);
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void sameIteratorExpressionError(const Token *tok);
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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 checkFindInsertError(const Token *tok);
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void sizeError(const Token* tok);
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void redundantIfRemoveError(const Token* tok);
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void invalidContainerLoopError(const Token* tok, const Token* loopTok, ErrorPath errorPath);
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void invalidContainerError(const Token *tok, const Token * contTok, const ValueFlow::Value *val, ErrorPath errorPath);
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void invalidContainerReferenceError(const Token* tok, const Token* contTok, ErrorPath errorPath);
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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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enum class SubstrErrorType { EMPTY, COPY, PREFIX, PREFIX_CONCAT };
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void uselessCallsSubstrError(const Token* tok, SubstrErrorType type);
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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 uselessCallsConstructorError(const Token* tok);
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void dereferenceInvalidIteratorError(const Token* deref, const std::string& iterName);
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void dereferenceInvalidIteratorError(const Token* tok, const ValueFlow::Value *value, bool inconclusive);
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void useStlAlgorithmError(const Token *tok, const std::string &algoName);
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void knownEmptyContainerError(const Token *tok, const std::string& algo);
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void globalLockGuardError(const Token *tok);
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void localMutexError(const Token *tok);
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void getErrorMessages(ErrorLogger* errorLogger, const Settings* settings) const override {
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ErrorPath errorPath;
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CheckStl c(nullptr, settings, errorLogger);
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c.outOfBoundsError(nullptr, "container", nullptr, "x", nullptr);
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c.invalidIteratorError(nullptr, "iterator");
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c.iteratorsError(nullptr, "container1", "container2");
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c.iteratorsError(nullptr, nullptr, "container0", "container1");
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c.iteratorsError(nullptr, nullptr, "container");
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c.invalidContainerLoopError(nullptr, nullptr, errorPath);
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c.invalidContainerError(nullptr, nullptr, nullptr, errorPath);
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c.mismatchingContainerIteratorError(nullptr, nullptr);
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c.mismatchingContainersError(nullptr, nullptr);
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c.mismatchingContainerExpressionError(nullptr, nullptr);
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c.sameIteratorExpressionError(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.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.checkFindInsertError(nullptr);
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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.string_c_strThrowError(nullptr);
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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.uselessCallsReturnValueError(nullptr, "str", "find");
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c.uselessCallsSwapError(nullptr, "str");
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c.uselessCallsSubstrError(nullptr, SubstrErrorType::COPY);
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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.useStlAlgorithmError(nullptr, emptyString);
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c.knownEmptyContainerError(nullptr, emptyString);
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c.globalLockGuardError(nullptr);
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c.localMutexError(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 override {
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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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"- same iterators 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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"- unnecessary searching in associative containers\n"
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"- redundant condition\n"
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"- common mistakes when using string::c_str()\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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"- iterating over an empty STL container\n"
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"- consider using an STL algorithm instead of raw loop\n"
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"- incorrect locking with mutex\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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