cppcheck/lib/programmemory.h

113 lines
3.6 KiB
C++

/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2021 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 GUARD_PROGRAMMEMORY_H
#define GUARD_PROGRAMMEMORY_H
#include "mathlib.h"
#include "utils.h"
#include "valueflow.h" // needed for alias
#include <map>
#include <unordered_map>
class Token;
class Settings;
struct ProgramMemory {
using Map = std::unordered_map<nonneg int, ValueFlow::Value>;
Map values;
void setValue(nonneg int exprid, const ValueFlow::Value& value);
const ValueFlow::Value* getValue(nonneg int exprid, bool impossible = false) const;
bool getIntValue(nonneg int exprid, MathLib::bigint* result) const;
void setIntValue(nonneg int exprid, MathLib::bigint value, bool impossible = false);
bool getContainerSizeValue(nonneg int exprid, MathLib::bigint* result) const;
bool getContainerEmptyValue(nonneg int exprid, MathLib::bigint* result) const;
void setContainerSizeValue(nonneg int exprid, MathLib::bigint value, bool isEqual = true);
void setUnknown(nonneg int exprid);
bool getTokValue(nonneg int exprid, const Token** result) const;
bool hasValue(nonneg int exprid);
void swap(ProgramMemory &pm);
void clear();
bool empty() const;
void replace(const ProgramMemory &pm);
void insert(const ProgramMemory &pm);
};
void programMemoryParseCondition(ProgramMemory& pm, const Token* tok, const Token* endTok, const Settings* settings, bool then);
struct ProgramMemoryState {
ProgramMemory state;
std::map<nonneg int, const Token*> origins;
const Settings* settings;
explicit ProgramMemoryState(const Settings* s);
void insert(const ProgramMemory &pm, const Token* origin = nullptr);
void replace(const ProgramMemory &pm, const Token* origin = nullptr);
void addState(const Token* tok, const ProgramMemory::Map& vars);
void assume(const Token* tok, bool b, bool isEmpty = false);
void removeModifiedVars(const Token* tok);
ProgramMemory get(const Token* tok, const Token* ctx, const ProgramMemory::Map& vars) const;
};
void execute(const Token* expr,
ProgramMemory* const programMemory,
MathLib::bigint* result,
bool* error,
const Settings* settings = nullptr);
/**
* Is condition always false when variable has given value?
* \param condition top ast token in condition
* \param programMemory program memory
*/
bool conditionIsFalse(const Token* condition, ProgramMemory pm, const Settings* settings = nullptr);
/**
* Is condition always true when variable has given value?
* \param condition top ast token in condition
* \param programMemory program memory
*/
bool conditionIsTrue(const Token* condition, ProgramMemory pm, const Settings* settings = nullptr);
/**
* Get program memory by looking backwards from given token.
*/
ProgramMemory getProgramMemory(const Token* tok, nonneg int exprid, const ValueFlow::Value& value, const Settings *settings);
ProgramMemory getProgramMemory(const Token *tok, const ProgramMemory::Map& vars);
#endif