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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2018 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 checkuninitvarH
#define checkuninitvarH
//---------------------------------------------------------------------------
#include "check.h"
#include "config.h"
#include <set>
#include <string>
class ErrorLogger;
class Scope;
class Settings;
class Token;
class Tokenizer;
class Variable;
struct VariableValue {
explicit VariableValue(MathLib::bigint val = 0) : value(val), notEqual(false) {}
MathLib::bigint value;
bool notEqual;
};
/// @addtogroup Checks
/// @{
/** @brief Checking for uninitialized variables */
class CPPCHECKLIB CheckUninitVar : public Check {
public:
/** @brief This constructor is used when registering the CheckUninitVar */
CheckUninitVar() : Check(myName()) {
}
/** @brief This constructor is used when running checks. */
CheckUninitVar(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
: Check(myName(), tokenizer, settings, errorLogger) {
}
/** @brief Run checks against the simplified token list */
void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) override {
CheckUninitVar checkUninitVar(tokenizer, settings, errorLogger);
checkUninitVar.check();
checkUninitVar.deadPointer();
checkUninitVar.valueFlowUninit();
}
/** Check for uninitialized variables */
void check();
void checkScope(const Scope* scope, const std::set<std::string> &arrayTypeDefs);
void checkStruct(const Token *tok, const Variable &structvar);
enum Alloc { NO_ALLOC, NO_CTOR_CALL, CTOR_CALL, ARRAY };
bool checkScopeForVariable(const Token *tok, const Variable& var, bool* const possibleInit, bool* const noreturn, Alloc* const alloc, const std::string &membervar, std::map<unsigned int, VariableValue> variableValue);
bool checkIfForWhileHead(const Token *startparentheses, const Variable& var, bool suppressErrors, bool isuninit, Alloc alloc, const std::string &membervar);
bool checkLoopBody(const Token *tok, const Variable& var, const Alloc alloc, const std::string &membervar, const bool suppressErrors);
void checkRhs(const Token *tok, const Variable &var, Alloc alloc, unsigned int number_of_if, const std::string &membervar);
bool isVariableUsage(const Token *vartok, bool pointer, Alloc alloc) const;
int isFunctionParUsage(const Token *vartok, bool pointer, Alloc alloc) const;
bool isMemberVariableAssignment(const Token *tok, const std::string &membervar) const;
bool isMemberVariableUsage(const Token *tok, bool isPointer, Alloc alloc, const std::string &membervar) const;
/** ValueFlow-based checking for dead pointer usage */
void deadPointer();
void deadPointerError(const Token *pointer, const Token *alias);
/** ValueFlow-based checking for uninitialized variables */
void valueFlowUninit();
void uninitstringError(const Token *tok, const std::string &varname, bool strncpy_);
void uninitdataError(const Token *tok, const std::string &varname);
void uninitvarError(const Token *tok, const std::string &varname);
void uninitvarError(const Token *tok, const std::string &varname, Alloc alloc) {
if (alloc == NO_CTOR_CALL || alloc == CTOR_CALL)
uninitdataError(tok, varname);
else
uninitvarError(tok, varname);
}
void uninitStructMemberError(const Token *tok, const std::string &membername);
private:
void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const override {
CheckUninitVar c(nullptr, settings, errorLogger);
// error
c.uninitstringError(nullptr, "varname", true);
c.uninitdataError(nullptr, "varname");
c.uninitvarError(nullptr, "varname");
c.uninitStructMemberError(nullptr, "a.b");
c.deadPointerError(nullptr, nullptr);
}
static std::string myName() {
return "Uninitialized variables";
}
std::string classInfo() const override {
return "Uninitialized variables\n"
"- using uninitialized local variables\n"
"- using allocated data before it has been initialized\n"
"- using dead pointer\n";
}
};
/// @}
//---------------------------------------------------------------------------
#endif // checkuninitvarH