124 lines
5.0 KiB
C++
124 lines
5.0 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2016 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 checkuninitvarH
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#define checkuninitvarH
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//---------------------------------------------------------------------------
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#include "config.h"
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#include "check.h"
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class Scope;
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class Variable;
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/// @addtogroup Checks
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/// @{
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/** @brief Checking for uninitialized variables */
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class CPPCHECKLIB CheckUninitVar : public Check {
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public:
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/** @brief This constructor is used when registering the CheckUninitVar */
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CheckUninitVar() : Check(myName()) {
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}
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/** @brief This constructor is used when running checks. */
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CheckUninitVar(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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CheckUninitVar checkUninitVar(tokenizer, settings, errorLogger);
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checkUninitVar.check();
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checkUninitVar.deadPointer();
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checkUninitVar.valueFlowUninit();
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}
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/** Check for uninitialized variables */
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void check();
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void checkScope(const Scope* scope, const std::set<std::string> &arrayTypeDefs);
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void checkStruct(const Token *tok, const Variable &structvar);
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enum Alloc { NO_ALLOC, NO_CTOR_CALL, CTOR_CALL, ARRAY };
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bool checkScopeForVariable(const Token *tok, const Variable& var, bool* const possibleInit, bool* const noreturn, Alloc* const alloc, const std::string &membervar);
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bool checkIfForWhileHead(const Token *startparentheses, const Variable& var, bool suppressErrors, bool isuninit, Alloc alloc, const std::string &membervar);
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bool checkLoopBody(const Token *tok, const Variable& var, const Alloc alloc, const std::string &membervar, const bool suppressErrors);
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void checkRhs(const Token *tok, const Variable &var, Alloc alloc, unsigned int number_of_if, const std::string &membervar);
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bool isVariableUsage(const Token *vartok, bool pointer, Alloc alloc) const;
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int isFunctionParUsage(const Token *vartok, bool pointer, Alloc alloc) const;
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bool isMemberVariableAssignment(const Token *tok, const std::string &membervar) const;
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bool isMemberVariableUsage(const Token *tok, bool isPointer, Alloc alloc, const std::string &membervar) const;
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/** ValueFlow-based checking for dead pointer usage */
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void deadPointer();
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void deadPointerError(const Token *pointer, const Token *alias);
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/** ValueFlow-based checking for uninitialized variables */
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void valueFlowUninit();
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/* data for multifile checking */
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class MyFileInfo : public Check::FileInfo {
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public:
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/* functions that must have initialized data */
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std::set<std::string> uvarFunctions;
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/* functions calls with uninitialized data */
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std::set<std::string> functionCalls;
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};
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void uninitstringError(const Token *tok, const std::string &varname, bool strncpy_);
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void uninitdataError(const Token *tok, const std::string &varname);
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void uninitvarError(const Token *tok, const std::string &varname);
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void uninitvarError(const Token *tok, const std::string &varname, Alloc alloc) {
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if (alloc == NO_CTOR_CALL || alloc == CTOR_CALL)
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uninitdataError(tok, varname);
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else
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uninitvarError(tok, varname);
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}
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void uninitStructMemberError(const Token *tok, const std::string &membername);
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private:
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
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CheckUninitVar c(nullptr, settings, errorLogger);
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// error
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c.uninitstringError(nullptr, "varname", true);
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c.uninitdataError(nullptr, "varname");
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c.uninitvarError(nullptr, "varname");
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c.uninitStructMemberError(nullptr, "a.b");
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c.deadPointerError(nullptr, nullptr);
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}
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static std::string myName() {
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return "Uninitialized variables";
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}
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std::string classInfo() const {
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return "Uninitialized variables\n"
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"- using uninitialized local variables\n"
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"- using allocated data before it has been initialized\n"
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"- using dead pointer\n";
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}
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // checkuninitvarH
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