cppcheck/lib/forwardanalyzer.h

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/*
* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2020 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 forwardanalyzerH
#define forwardanalyzerH
#include <vector>
class Settings;
class Token;
template <class T> class ValuePtr;
struct ForwardAnalyzer {
struct Action {
Action() : mFlag(0) {}
// cppcheck-suppress noExplicitConstructor
Action(unsigned int f) : mFlag(f) {}
enum {
None = 0,
Read = (1 << 0),
Write = (1 << 1),
Invalid = (1 << 2),
Inconclusive = (1 << 3),
};
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void set(unsigned int f, bool state = true) {
mFlag = state ? mFlag | f : mFlag & ~f;
}
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bool get(unsigned int f) const {
return ((mFlag & f) != 0);
}
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bool isRead() const {
return get(Read);
}
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bool isWrite() const {
return get(Write);
}
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bool isInvalid() const {
return get(Invalid);
}
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bool isInconclusive() const {
return get(Inconclusive);
}
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bool isNone() const {
return mFlag == None;
}
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bool isModified() const {
return isWrite() || isInvalid();
}
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Action& operator|=(Action a) {
set(a.mFlag);
return *this;
}
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friend Action operator|(Action a, Action b) {
a |= b;
return a;
}
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friend bool operator==(Action a, Action b) {
return a.mFlag == b.mFlag;
}
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friend bool operator!=(Action a, Action b) {
return a.mFlag != b.mFlag;
}
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private:
unsigned int mFlag;
};
/// Analyze a token
virtual Action analyze(const Token* tok) const = 0;
/// Update the state of the value
virtual void update(Token* tok, Action a) = 0;
/// Try to evaluate the value of a token(most likely a condition)
virtual std::vector<int> evaluate(const Token* tok) const = 0;
/// Lower any values to possible
virtual bool lowerToPossible() = 0;
/// Lower any values to inconclusive
virtual bool lowerToInconclusive() = 0;
/// If the analysis is unsure whether to update a scope, this will return true if the analysis should bifurcate the scope
virtual bool updateScope(const Token* endBlock, bool modified) const = 0;
/// If the value is conditional
virtual bool isConditional() const = 0;
/// The condition that will be assumed during analysis
virtual void assume(const Token* tok, bool state, const Token* at = nullptr) = 0;
virtual ~ForwardAnalyzer() {}
};
void valueFlowGenericForward(Token* start, const Token* end, const ValuePtr<ForwardAnalyzer>& fa, const Settings* settings);
#endif