145 lines
4.8 KiB
C++
145 lines
4.8 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2015 Daniel Marjamäki and 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 checkleakautovarH
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#define checkleakautovarH
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//---------------------------------------------------------------------------
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#include "config.h"
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#include "check.h"
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#include <map>
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#include <set>
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class CPPCHECKLIB VarInfo {
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public:
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enum AllocStatus { DEALLOC = -1, NOALLOC = 0, ALLOC = 1 };
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struct AllocInfo {
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AllocStatus status;
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int type;
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AllocInfo(int type_ = 0, AllocStatus status_ = NOALLOC) : status(status_), type(type_) {}
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};
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std::map<unsigned int, AllocInfo> alloctype;
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std::map<unsigned int, std::string> possibleUsage;
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std::set<unsigned int> conditionalAlloc;
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std::set<unsigned int> referenced;
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void clear() {
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alloctype.clear();
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possibleUsage.clear();
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conditionalAlloc.clear();
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referenced.clear();
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}
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void erase(unsigned int varid) {
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alloctype.erase(varid);
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possibleUsage.erase(varid);
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conditionalAlloc.erase(varid);
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}
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void swap(VarInfo &other) {
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alloctype.swap(other.alloctype);
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possibleUsage.swap(other.possibleUsage);
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conditionalAlloc.swap(other.conditionalAlloc);
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referenced.swap(other.referenced);
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}
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/** set possible usage for all variables */
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void possibleUsageAll(const std::string &functionName);
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void print();
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};
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/// @addtogroup Checks
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/// @{
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/**
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* @brief Check for leaks
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*/
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class CPPCHECKLIB CheckLeakAutoVar : public Check {
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public:
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/** This constructor is used when registering the CheckLeakAutoVar */
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CheckLeakAutoVar() : Check(myName()) {
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}
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/** This constructor is used when running checks. */
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CheckLeakAutoVar(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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/** @brief Run checks against the simplified token list */
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void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
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CheckLeakAutoVar checkLeakAutoVar(tokenizer, settings, errorLogger);
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checkLeakAutoVar.check();
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}
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private:
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/** check for leaks in all scopes */
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void check();
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/** check for leaks in a function scope */
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void checkScope(const Token * const startToken,
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VarInfo *varInfo,
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std::set<unsigned int> notzero);
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/** parse function call */
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void functionCall(const Token *tok, VarInfo *varInfo, const VarInfo::AllocInfo& allocation);
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/** parse changes in allocation status */
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void changeAllocStatus(VarInfo *varInfo, const VarInfo::AllocInfo& allocation, const Token* tok, const Token* arg);
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/** return. either "return" or end of variable scope is seen */
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void ret(const Token *tok, const VarInfo &varInfo);
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/** if variable is allocated then there is a leak */
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void leakIfAllocated(const Token *vartok, const VarInfo &varInfo);
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void leakError(const Token* tok, const std::string &varname, int type);
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void mismatchError(const Token* tok, const std::string &varname);
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void deallocUseError(const Token *tok, const std::string &varname);
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void deallocReturnError(const Token *tok, const std::string &varname);
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void doubleFreeError(const Token *tok, const std::string &varname, int type);
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/** message: user configuration is needed to complete analysis */
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void configurationInfo(const Token* tok, const std::string &functionName);
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
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CheckLeakAutoVar c(0, settings, errorLogger);
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c.deallocReturnError(0, "p");
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c.configurationInfo(0, "f"); // user configuration is needed to complete analysis
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c.doubleFreeError(0, "varname", 0);
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}
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static std::string myName() {
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return "Leaks (auto variables)";
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}
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std::string classInfo() const {
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return "Detect when a auto variable is allocated but not deallocated or deallocated twice.\n";
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}
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // checkleakautovarH
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