101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2019 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef forwardanalyzerH
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#define forwardanalyzerH
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#include "token.h"
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#include "valueptr.h"
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#include <vector>
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class Settings;
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struct ForwardAnalyzer {
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struct Action {
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Action() : mFlag(0) {}
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// cppcheck-suppress noExplicitConstructor
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Action(unsigned int f) : mFlag(f) {}
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enum {
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None = 0,
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Read = (1 << 0),
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Write = (1 << 1),
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Invalid = (1 << 2),
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Inconclusive = (1 << 3),
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};
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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)
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{
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set(a.mFlag);
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return *this;
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}
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friend Action operator|(Action a, Action b)
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{
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a |= b;
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return a;
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}
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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:
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unsigned int mFlag;
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};
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/// Analyze a token
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virtual Action analyze(const Token* tok) const = 0;
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/// Update the state of the value
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virtual void update(Token* tok, Action a) = 0;
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/// Try to evaluate the value of a token(most likely a condition)
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virtual std::vector<int> evaluate(const Token* tok) const = 0;
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/// Lower any values to possible
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virtual bool lowerToPossible() = 0;
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/// Lower any values to inconclusive
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virtual bool lowerToInconclusive() = 0;
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/// If the analysis is unsure whether to update a scope, this will return true if the analysis should bifurcate the scope
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virtual bool updateScope(const Token* endBlock, bool modified) const = 0;
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/// If the value is conditional
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virtual bool isConditional() const = 0;
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/// The condtion that wil be assumes during analysis
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virtual void assume(const Token* tok, bool state) = 0;
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virtual ~ForwardAnalyzer() {}
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};
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void valueFlowGenericForward(Token* start, const Token* end, const ValuePtr<ForwardAnalyzer>& fa, const Settings* settings);
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#endif
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