cppcheck/lib/valueflow.h

/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2023 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 "config.h"
#include "mathlib.h"
#include "vfvalue.h"

#include <cstdlib>
#include <functional>
#include <list>
#include <string>
#include <utility>
#include <vector>

class ErrorLogger;
struct InferModel;
class Settings;
class SymbolDatabase;
class Token;
class TokenList;
class ValueType;
class Variable;
class Scope;

template<class T>
class ValuePtr;

namespace ValueFlow {
    /// Constant folding of expression. This can be used before the full ValueFlow has been executed (ValueFlow::setValues).
    const Value * valueFlowConstantFoldAST(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);

    size_t getSizeOf(const ValueType &vt, const Settings *settings);

    const Value* findValue(const std::list<Value>& values,
                           const Settings* settings,
                           const std::function<bool(const Value&)> &pred);

    std::vector<Value> isOutOfBounds(const Value& size, const Token* indexTok, bool possible = true);

    Value asImpossible(Value v);

    bool isContainerSizeChanged(const Token* tok, int indirect, const Settings* settings = nullptr, int depth = 20);

    struct LifetimeToken {
        const Token* token;
        Value::ErrorPath errorPath;
        bool addressOf;
        bool inconclusive;

        LifetimeToken() : token(nullptr), errorPath(), addressOf(false), inconclusive(false) {}

        LifetimeToken(const Token* token, Value::ErrorPath errorPath)
            : token(token), errorPath(std::move(errorPath)), addressOf(false), inconclusive(false)
        {}

        LifetimeToken(const Token* token, bool addressOf, Value::ErrorPath errorPath)
            : token(token), errorPath(std::move(errorPath)), addressOf(addressOf), inconclusive(false)
        {}

        static std::vector<LifetimeToken> setAddressOf(std::vector<LifetimeToken> v, bool b) {
            for (LifetimeToken& x : v)
                x.addressOf = b;
            return v;
        }

        static std::vector<LifetimeToken> setInconclusive(std::vector<LifetimeToken> v, bool b) {
            for (LifetimeToken& x : v)
                x.inconclusive = b;
            return v;
        }
    };

    const Token *parseCompareInt(const Token *tok, Value &true_value, Value &false_value, const std::function<std::vector<MathLib::bigint>(const Token*)>& evaluate);
    const Token *parseCompareInt(const Token *tok, Value &true_value, Value &false_value);

    CPPCHECKLIB ValuePtr<InferModel> makeIntegralInferModel();

    const Token* solveExprValue(const Token* expr,
                                const std::function<std::vector<MathLib::bigint>(const Token*)>& eval,
                                Value& value);

    std::vector<LifetimeToken> getLifetimeTokens(const Token* tok,
                                                 bool escape = false,
                                                 Value::ErrorPath errorPath = Value::ErrorPath{});

    bool hasLifetimeToken(const Token* tok, const Token* lifetime);

    const Variable* getLifetimeVariable(const Token* tok, Value::ErrorPath& errorPath, bool* addressOf = nullptr);

    const Variable* getLifetimeVariable(const Token* tok);

    bool isLifetimeBorrowed(const Token *tok, const Settings *settings);

    std::string lifetimeMessage(const Token *tok, const Value *val, Value::ErrorPath &errorPath);

    CPPCHECKLIB Value getLifetimeObjValue(const Token *tok, bool inconclusive = false);

    CPPCHECKLIB std::vector<Value> getLifetimeObjValues(const Token* tok,
                                                        bool inconclusive = false,
                                                        MathLib::bigint path = 0);

    const Token* getEndOfExprScope(const Token* tok, const Scope* defaultScope = nullptr, bool smallest = true);

    void combineValueProperties(const Value& value1, const Value& value2, Value* result);
}

#endif // valueflowH