cppcheck/lib/checkstl.h

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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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*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
//---------------------------------------------------------------------------
#ifndef checkstlH
#define checkstlH
//---------------------------------------------------------------------------
#include "check.h"
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#include "config.h"
#include "library.h"
#include "tokenize.h"
#include <map>
#include <string>
class ErrorLogger;
class Scope;
class Settings;
class Token;
class Variable;
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/// @addtogroup Checks
/// @{
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/** @brief %Check STL usage (invalidation of iterators, mismatching containers, etc) */
class CPPCHECKLIB CheckStl : public Check {
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public:
/** 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. */
CheckStl(const Tokenizer* tokenizer, const Settings* settings, ErrorLogger* errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger) {
}
/** run checks, the token list is not simplified */
virtual void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) override {
if (!tokenizer->isCPP()) {
return;
}
CheckStl checkStl(tokenizer, settings, errorLogger);
checkStl.outOfBounds();
}
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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) override {
if (!tokenizer->isCPP()) {
return;
}
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CheckStl checkStl(tokenizer, settings, errorLogger);
checkStl.stlOutOfBounds();
checkStl.negativeIndex();
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checkStl.iterators();
checkStl.mismatchingContainers();
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checkStl.erase();
checkStl.pushback();
checkStl.stlBoundaries();
checkStl.if_find();
checkStl.string_c_str();
checkStl.checkAutoPointer();
checkStl.uselessCalls();
checkStl.checkDereferenceInvalidIterator();
// Style check
checkStl.size();
checkStl.redundantCondition();
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checkStl.missingComparison();
checkStl.useStlAlgorithm();
}
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/** Accessing container out of bounds using ValueFlow */
void outOfBounds();
/**
* Finds errors like this:
* for (unsigned ii = 0; ii <= foo.size(); ++ii)
*/
void stlOutOfBounds();
/**
* negative index for array like containers
*/
void negativeIndex();
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/**
* Finds errors like this:
* for (it = foo.begin(); it != bar.end(); ++it)
*/
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void iterators();
/**
* Mismatching containers:
* std::find(foo.begin(), bar.end(), x)
*/
void mismatchingContainers();
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/**
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* Dangerous usage of erase. The iterator is invalidated by erase so
* it is bad to dereference it after the erase.
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*/
void erase();
void eraseCheckLoopVar(const Scope& scope, const Variable* var);
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/**
* Dangerous usage of push_back and insert
*/
void pushback();
/**
* bad condition.. "it < alist.end()"
*/
void stlBoundaries();
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/** if (a.find(x)) - possibly incorrect condition */
void if_find();
/**
* Suggest using empty() instead of checking size() against zero for containers.
* Item 4 from Scott Meyers book "Effective STL".
*/
void size();
/**
* Check for redundant condition 'if (ints.find(1) != ints.end()) ints.remove(123);'
* */
void redundantCondition();
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/**
* @brief Missing inner comparison, when incrementing iterator inside loop
* Dangers:
* - may increment iterator beyond end
* - may unintentionally skip elements in list/set etc
*/
void missingComparison();
/** Check for common mistakes when using the function string::c_str() */
void string_c_str();
/** @brief %Check for use and copy auto pointer */
void checkAutoPointer();
/** @brief %Check calls that using them is useless */
void uselessCalls();
/** @brief %Check for dereferencing an iterator that is invalid */
void checkDereferenceInvalidIterator();
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/**
* Dereferencing an erased iterator
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* @param erased token where the erase occurs
* @param deref token where the dereference occurs
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* @param itername iterator name
* @param inconclusive inconclusive flag
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*/
void dereferenceErasedError(const Token* erased, const Token* deref, const std::string& itername, bool inconclusive);
/** @brief Reading from empty stl container (using valueflow) */
void readingEmptyStlContainer2();
/** @brief Look for loops that can replaced with std algorithms */
void useStlAlgorithm();
private:
void missingComparisonError(const Token* incrementToken1, const Token* incrementToken2);
void string_c_strThrowError(const Token* tok);
void string_c_strError(const Token* tok);
void string_c_strReturn(const Token* tok);
void string_c_strParam(const Token* tok, unsigned int number);
void outOfBoundsError(const Token *tok, const ValueFlow::Value *containerSize, const ValueFlow::Value *index);
void stlOutOfBoundsError(const Token* tok, const std::string& num, const std::string& var, bool at);
void negativeIndexError(const Token* tok, const ValueFlow::Value& index);
void invalidIteratorError(const Token* tok, const std::string& iteratorName);
void iteratorsError(const Token* tok, const std::string& containerName1, const std::string& containerName2);
void iteratorsError(const Token* tok, const Token* containerTok, const std::string& containerName1, const std::string& containerName2);
void iteratorsError(const Token* tok, const Token* containerTok, const std::string& containerName);
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void iteratorsCmpError(const Token* cmpOperatorTok, const Token* containerTok1, const Token* containerTok2, const std::string& containerName1, const std::string& containerName2);
void iteratorsCmpError(const Token* cmpOperatorTok, const Token* containerTok1, const Token* containerTok2, const std::string& containerName);
void mismatchingContainersError(const Token* tok);
void mismatchingContainerExpressionError(const Token *tok1, const Token *tok2);
void sameIteratorExpressionError(const Token *tok);
void invalidIteratorError(const Token* tok, const std::string& func, const std::string& iterator_name);
void invalidPointerError(const Token* tok, const std::string& func, const std::string& pointer_name);
void stlBoundariesError(const Token* tok);
void if_findError(const Token* tok, bool str);
void sizeError(const Token* tok);
void redundantIfRemoveError(const Token* tok);
void autoPointerError(const Token* tok);
void autoPointerContainerError(const Token* tok);
void autoPointerArrayError(const Token* tok);
void autoPointerMallocError(const Token* tok, const std::string& allocFunction);
void uselessCallsReturnValueError(const Token* tok, const std::string& varname, const std::string& function);
void uselessCallsSwapError(const Token* tok, const std::string& varname);
void uselessCallsSubstrError(const Token* tok, bool empty);
void uselessCallsEmptyError(const Token* tok);
void uselessCallsRemoveError(const Token* tok, const std::string& function);
void dereferenceInvalidIteratorError(const Token* deref, const std::string& iterName);
void readingEmptyStlContainerError(const Token* tok, const ValueFlow::Value *value=nullptr);
void useStlAlgorithmError(const Token *tok, const std::string &algoName);
bool compareIteratorAgainstDifferentContainer(const Token* tok, const Token* containerToken, const unsigned int iteratorId, const std::map<unsigned int, const Token*>& iteratorScopeBeginInfo);
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void getErrorMessages(ErrorLogger* errorLogger, const Settings* settings) const override {
CheckStl c(nullptr, settings, errorLogger);
c.outOfBoundsError(nullptr, nullptr, nullptr);
c.invalidIteratorError(nullptr, "iterator");
c.iteratorsError(nullptr, "container1", "container2");
c.iteratorsError(nullptr, nullptr, "container1", "container2");
c.iteratorsError(nullptr, nullptr, "container");
c.iteratorsCmpError(nullptr, nullptr, nullptr, "container1", "container2");
c.iteratorsCmpError(nullptr, nullptr, nullptr, "container");
c.mismatchingContainersError(nullptr);
c.mismatchingContainerExpressionError(nullptr, nullptr);
c.sameIteratorExpressionError(nullptr);
c.dereferenceErasedError(nullptr, nullptr, "iter", false);
c.stlOutOfBoundsError(nullptr, "i", "foo", false);
c.negativeIndexError(nullptr, ValueFlow::Value(-1));
c.invalidIteratorError(nullptr, "push_back|push_front|insert", "iterator");
c.invalidPointerError(nullptr, "push_back", "pointer");
c.stlBoundariesError(nullptr);
c.if_findError(nullptr, false);
c.if_findError(nullptr, true);
c.string_c_strError(nullptr);
c.string_c_strReturn(nullptr);
c.string_c_strParam(nullptr, 0);
c.string_c_strThrowError(nullptr);
c.sizeError(nullptr);
c.missingComparisonError(nullptr, nullptr);
c.redundantIfRemoveError(nullptr);
c.autoPointerError(nullptr);
c.autoPointerContainerError(nullptr);
c.autoPointerArrayError(nullptr);
c.autoPointerMallocError(nullptr, "malloc");
c.uselessCallsReturnValueError(nullptr, "str", "find");
c.uselessCallsSwapError(nullptr, "str");
c.uselessCallsSubstrError(nullptr, false);
c.uselessCallsEmptyError(nullptr);
c.uselessCallsRemoveError(nullptr, "remove");
c.dereferenceInvalidIteratorError(nullptr, "i");
c.readingEmptyStlContainerError(nullptr);
c.useStlAlgorithmError(nullptr, "");
}
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static std::string myName() {
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return "STL usage";
}
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std::string classInfo() const override {
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return "Check for invalid usage of STL:\n"
"- out of bounds errors\n"
"- misuse of iterators when iterating through a container\n"
"- mismatching containers in calls\n"
"- same iterators in calls\n"
"- dereferencing an erased iterator\n"
"- for vectors: using iterator/pointer after push_back has been used\n"
"- optimisation: use empty() instead of size() to guarantee fast code\n"
"- suspicious condition when using find\n"
"- redundant condition\n"
"- common mistakes when using string::c_str()\n"
"- using auto pointer (auto_ptr)\n"
"- useless calls of string and STL functions\n"
"- dereferencing an invalid iterator\n"
"- reading from empty STL container\n"
"- consider using an STL algorithm instead of raw loop\n";
}
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};
/// @}
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//---------------------------------------------------------------------------
#endif // checkstlH