315 lines
12 KiB
C++
315 lines
12 KiB
C++
/*
|
|
* Cppcheck - A tool for static C/C++ code analysis
|
|
* Copyright (C) 2007-2020 Cppcheck team.
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
#ifndef checkstlH
|
|
#define checkstlH
|
|
//---------------------------------------------------------------------------
|
|
|
|
#include "check.h"
|
|
#include "config.h"
|
|
#include "errortypes.h"
|
|
#include "tokenize.h"
|
|
#include "utils.h"
|
|
#include "valueflow.h"
|
|
|
|
#include <string>
|
|
|
|
class Scope;
|
|
class Settings;
|
|
class Token;
|
|
class Variable;
|
|
class ErrorLogger;
|
|
|
|
|
|
/// @addtogroup Checks
|
|
/// @{
|
|
|
|
|
|
/** @brief %Check STL usage (invalidation of iterators, mismatching containers, etc) */
|
|
class CPPCHECKLIB CheckStl : public Check {
|
|
public:
|
|
/** This constructor is used when registering the CheckClass */
|
|
CheckStl() : Check(myName()) {
|
|
}
|
|
|
|
/** This constructor is used when running checks. */
|
|
CheckStl(const Tokenizer* tokenizer, const Settings* settings, ErrorLogger* errorLogger)
|
|
: Check(myName(), tokenizer, settings, errorLogger) {
|
|
}
|
|
|
|
/** run checks, the token list is not simplified */
|
|
void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) OVERRIDE {
|
|
if (!tokenizer->isCPP()) {
|
|
return;
|
|
}
|
|
|
|
CheckStl checkStl(tokenizer, settings, errorLogger);
|
|
checkStl.erase();
|
|
checkStl.if_find();
|
|
checkStl.checkFindInsert();
|
|
checkStl.iterators();
|
|
checkStl.mismatchingContainers();
|
|
checkStl.missingComparison();
|
|
checkStl.outOfBounds();
|
|
checkStl.outOfBoundsIndexExpression();
|
|
checkStl.redundantCondition();
|
|
checkStl.string_c_str();
|
|
checkStl.uselessCalls();
|
|
checkStl.useStlAlgorithm();
|
|
|
|
checkStl.stlOutOfBounds();
|
|
checkStl.negativeIndex();
|
|
|
|
checkStl.invalidContainer();
|
|
checkStl.invalidContainerLoop();
|
|
checkStl.mismatchingContainers();
|
|
checkStl.mismatchingContainerIterator();
|
|
checkStl.knownEmptyContainerLoop();
|
|
|
|
checkStl.stlBoundaries();
|
|
checkStl.checkDereferenceInvalidIterator();
|
|
checkStl.checkDereferenceInvalidIterator2();
|
|
checkStl.checkMutexes();
|
|
|
|
// Style check
|
|
checkStl.size();
|
|
}
|
|
|
|
/** Accessing container out of bounds using ValueFlow */
|
|
void outOfBounds();
|
|
|
|
/** Accessing container out of bounds, following index expression */
|
|
void outOfBoundsIndexExpression();
|
|
|
|
/**
|
|
* Finds errors like this:
|
|
* for (unsigned ii = 0; ii <= foo.size(); ++ii)
|
|
*/
|
|
void stlOutOfBounds();
|
|
|
|
/**
|
|
* negative index for array like containers
|
|
*/
|
|
void negativeIndex();
|
|
|
|
/**
|
|
* Finds errors like this:
|
|
* for (it = foo.begin(); it != bar.end(); ++it)
|
|
*/
|
|
void iterators();
|
|
|
|
void invalidContainer();
|
|
|
|
void invalidContainerLoop();
|
|
|
|
bool checkIteratorPair(const Token* tok1, const Token* tok2);
|
|
|
|
/**
|
|
* Mismatching containers:
|
|
* std::find(foo.begin(), bar.end(), x)
|
|
*/
|
|
void mismatchingContainers();
|
|
|
|
void mismatchingContainerIterator();
|
|
|
|
/**
|
|
* Dangerous usage of erase. The iterator is invalidated by erase so
|
|
* it is bad to dereference it after the erase.
|
|
*/
|
|
void erase();
|
|
void eraseCheckLoopVar(const Scope& scope, const Variable* var);
|
|
|
|
/**
|
|
* bad condition.. "it < alist.end()"
|
|
*/
|
|
void stlBoundaries();
|
|
|
|
/** if (a.find(x)) - possibly incorrect condition */
|
|
void if_find();
|
|
|
|
void checkFindInsert();
|
|
|
|
/**
|
|
* 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();
|
|
|
|
/**
|
|
* @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 calls that using them is useless */
|
|
void uselessCalls();
|
|
|
|
/** @brief %Check for dereferencing an iterator that is invalid */
|
|
void checkDereferenceInvalidIterator();
|
|
void checkDereferenceInvalidIterator2();
|
|
|
|
/**
|
|
* Dereferencing an erased iterator
|
|
* @param erased token where the erase occurs
|
|
* @param deref token where the dereference occurs
|
|
* @param itername iterator name
|
|
* @param inconclusive inconclusive flag
|
|
*/
|
|
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();
|
|
|
|
void knownEmptyContainerLoop();
|
|
|
|
void checkMutexes();
|
|
|
|
private:
|
|
bool isContainerSize(const Token *containerToken, const Token *expr) const;
|
|
bool isContainerSizeGE(const Token * containerToken, const Token *expr) const;
|
|
|
|
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, nonneg int number);
|
|
|
|
void outOfBoundsError(const Token *tok, const std::string &containerName, const ValueFlow::Value *containerSize, const std::string &index, const ValueFlow::Value *indexValue);
|
|
void outOfBoundsIndexExpressionError(const Token *tok, const Token *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);
|
|
void mismatchingContainerIteratorError(const Token* tok, const Token* iterTok);
|
|
void mismatchingContainersError(const Token* tok1, const Token* tok2);
|
|
void mismatchingContainerExpressionError(const Token *tok1, const Token *tok2);
|
|
void sameIteratorExpressionError(const Token *tok);
|
|
void stlBoundariesError(const Token* tok);
|
|
void if_findError(const Token* tok, bool str);
|
|
void checkFindInsertError(const Token *tok);
|
|
void sizeError(const Token* tok);
|
|
void redundantIfRemoveError(const Token* tok);
|
|
void invalidContainerLoopError(const Token *tok, const Token * loopTok);
|
|
void invalidContainerError(const Token *tok, const Token * contTok, const ValueFlow::Value *val, ErrorPath errorPath);
|
|
void invalidContainerReferenceError(const Token* tok, const Token* contTok, ErrorPath errorPath);
|
|
|
|
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 dereferenceInvalidIteratorError(const Token* tok, const ValueFlow::Value *value, bool inconclusive);
|
|
|
|
void readingEmptyStlContainerError(const Token* tok, const ValueFlow::Value *value=nullptr);
|
|
|
|
void useStlAlgorithmError(const Token *tok, const std::string &algoName);
|
|
|
|
void knownEmptyContainerLoopError(const Token *tok);
|
|
|
|
void globalLockGuardError(const Token *tok);
|
|
void localMutexError(const Token *tok);
|
|
|
|
void getErrorMessages(ErrorLogger* errorLogger, const Settings* settings) const OVERRIDE {
|
|
ErrorPath errorPath;
|
|
CheckStl c(nullptr, settings, errorLogger);
|
|
c.outOfBoundsError(nullptr, "container", nullptr, "x", nullptr);
|
|
c.invalidIteratorError(nullptr, "iterator");
|
|
c.iteratorsError(nullptr, "container1", "container2");
|
|
c.iteratorsError(nullptr, nullptr, "container0", "container1");
|
|
c.iteratorsError(nullptr, nullptr, "container");
|
|
c.invalidContainerLoopError(nullptr, nullptr);
|
|
c.invalidContainerError(nullptr, nullptr, nullptr, errorPath);
|
|
c.mismatchingContainerIteratorError(nullptr, nullptr);
|
|
c.mismatchingContainersError(nullptr, 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.stlBoundariesError(nullptr);
|
|
c.if_findError(nullptr, false);
|
|
c.if_findError(nullptr, true);
|
|
c.checkFindInsertError(nullptr);
|
|
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.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, "");
|
|
c.knownEmptyContainerLoopError(nullptr);
|
|
c.globalLockGuardError(nullptr);
|
|
c.localMutexError(nullptr);
|
|
}
|
|
|
|
static std::string myName() {
|
|
return "STL usage";
|
|
}
|
|
|
|
std::string classInfo() const OVERRIDE {
|
|
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"
|
|
"- unnecessary searching in associative containers\n"
|
|
"- redundant condition\n"
|
|
"- common mistakes when using string::c_str()\n"
|
|
"- useless calls of string and STL functions\n"
|
|
"- dereferencing an invalid iterator\n"
|
|
"- reading from empty STL container\n"
|
|
"- iterating over an empty STL container\n"
|
|
"- consider using an STL algorithm instead of raw loop\n"
|
|
"- incorrect locking with mutex\n";
|
|
}
|
|
};
|
|
/// @}
|
|
//---------------------------------------------------------------------------
|
|
#endif // checkstlH
|