cppcheck/lib/valueflow.h

115 lines
4.0 KiB
C++

/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2016 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 valueflowH
#define valueflowH
//---------------------------------------------------------------------------
#include <string>
#include "config.h"
class Token;
class TokenList;
class SymbolDatabase;
class ErrorLogger;
class Settings;
namespace ValueFlow {
class CPPCHECKLIB Value {
public:
explicit Value(long long val = 0) : intvalue(val), tokvalue(nullptr), varvalue(val), condition(0), varId(0U), conditional(false), inconclusive(false), defaultArg(false), valueKind(ValueKind::Possible) {}
Value(const Token *c, long long val) : intvalue(val), tokvalue(nullptr), varvalue(val), condition(c), varId(0U), conditional(false), inconclusive(false), defaultArg(false), valueKind(ValueKind::Possible) {}
bool operator==(const Value &rhs) const {
return intvalue == rhs.intvalue &&
tokvalue == rhs.tokvalue &&
varvalue == rhs.varvalue &&
condition == rhs.condition &&
varId == rhs.varId &&
conditional == rhs.conditional &&
inconclusive == rhs.inconclusive &&
defaultArg == rhs.defaultArg &&
valueKind == rhs.valueKind;
}
/** int value */
long long intvalue;
/** token value - the token that has the value. this is used for pointer aliases, strings, etc. */
const Token *tokvalue;
/** For calculated values - variable value that calculated value depends on */
long long varvalue;
/** Condition that this value depends on (TODO: replace with a 'callstack') */
const Token *condition;
/** For calculated values - varId that calculated value depends on */
unsigned int varId;
/** Conditional value */
bool conditional;
/** Is this value inconclusive? */
bool inconclusive;
/** Is this value passed as default parameter to the function? */
bool defaultArg;
/** How known is this value */
enum ValueKind {
/** This value is possible, other unlisted values may also be possible */
Possible,
/** Only listed values are possible */
Known
} valueKind;
void setKnown() {
valueKind = ValueKind::Known;
}
bool isKnown() const {
return valueKind == ValueKind::Known;
}
void setPossible() {
valueKind = ValueKind::Possible;
}
bool isPossible() const {
return valueKind == ValueKind::Possible;
}
void changeKnownToPossible() {
if (isKnown())
valueKind = ValueKind::Possible;
}
};
/// Constant folding of expression. This can be used before the full ValueFlow has been executed (ValueFlow::setValues).
const ValueFlow::Value * valueFlowConstantFoldAST(const Token *expr, const Settings *settings);
/// Perform valueflow analysis.
void setValues(TokenList *tokenlist, SymbolDatabase* symboldatabase, ErrorLogger *errorLogger, const Settings *settings);
std::string eitherTheConditionIsRedundant(const Token *condition);
}
#endif // valueflowH