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//===--- InterpState.h - Interpreter state for the constexpr VM -*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Definition of the interpreter state and entry point.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_INTERP_INTERPSTATE_H
#define LLVM_CLANG_AST_INTERP_INTERPSTATE_H
#include "Context.h"
#include "Function.h"
#include "InterpStack.h"
#include "State.h"
#include "clang/AST/APValue.h"
#include "clang/AST/ASTDiagnostic.h"
#include "clang/AST/Expr.h"
#include "clang/AST/OptionalDiagnostic.h"
namespace clang {
namespace interp {
class Context;
class Function;
class InterpStack;
class InterpFrame;
class SourceMapper;
/// Interpreter context.
class InterpState final : public State, public SourceMapper {
public:
InterpState(State &Parent, Program &P, InterpStack &Stk, Context &Ctx,
SourceMapper *M = nullptr);
~InterpState();
// Stack frame accessors.
Frame *getSplitFrame() { return Parent.getCurrentFrame(); }
Frame *getCurrentFrame() override;
unsigned getCallStackDepth() override { return CallStackDepth; }
const Frame *getBottomFrame() const override {
return Parent.getBottomFrame();
}
// Acces objects from the walker context.
Expr::EvalStatus &getEvalStatus() const override {
return Parent.getEvalStatus();
}
ASTContext &getCtx() const override { return Parent.getCtx(); }
// Forward status checks and updates to the walker.
bool checkingForUndefinedBehavior() const override {
return Parent.checkingForUndefinedBehavior();
}
bool keepEvaluatingAfterFailure() const override {
return Parent.keepEvaluatingAfterFailure();
}
bool checkingPotentialConstantExpression() const override {
return Parent.checkingPotentialConstantExpression();
}
bool noteUndefinedBehavior() override {
return Parent.noteUndefinedBehavior();
}
bool hasActiveDiagnostic() override { return Parent.hasActiveDiagnostic(); }
void setActiveDiagnostic(bool Flag) override {
Parent.setActiveDiagnostic(Flag);
}
void setFoldFailureDiagnostic(bool Flag) override {
Parent.setFoldFailureDiagnostic(Flag);
}
bool hasPriorDiagnostic() override { return Parent.hasPriorDiagnostic(); }
/// Reports overflow and return true if evaluation should continue.
bool reportOverflow(const Expr *E, const llvm::APSInt &Value);
/// Deallocates a pointer.
void deallocate(Block *B);
/// Delegates source mapping to the mapper.
SourceInfo getSource(Function *F, CodePtr PC) const override {
return M ? M->getSource(F, PC) : F->getSource(PC);
}
private:
/// AST Walker state.
State &Parent;
/// Dead block chain.
DeadBlock *DeadBlocks = nullptr;
/// Reference to the offset-source mapping.
SourceMapper *M;
public:
/// Reference to the module containing all bytecode.
Program &P;
/// Temporary stack.
InterpStack &Stk;
/// Interpreter Context.
Context &Ctx;
/// The current frame.
InterpFrame *Current = nullptr;
/// Call stack depth.
unsigned CallStackDepth;
};
} // namespace interp
} // namespace clang
#endif
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