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// Copyright 2021 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_DEOPTIMIZER_DEOPTIMIZED_FRAME_INFO_H_
#define V8_DEOPTIMIZER_DEOPTIMIZED_FRAME_INFO_H_
#include <vector>
#include "src/deoptimizer/translated-state.h"
namespace v8 {
namespace internal {
// Class used to represent an unoptimized frame when the debugger
// needs to inspect a frame that is part of an optimized frame. The
// internally used FrameDescription objects are not GC safe so for use
// by the debugger frame information is copied to an object of this type.
// Represents parameters in unadapted form so their number might mismatch
// formal parameter count.
class DeoptimizedFrameInfo : public Malloced {
public:
DeoptimizedFrameInfo(TranslatedState* state,
TranslatedState::iterator frame_it, Isolate* isolate);
// Get the frame context.
Handle<Object> GetContext() { return context_; }
// Get an incoming argument.
Handle<Object> GetParameter(int index) {
DCHECK(0 <= index && index < parameters_count());
return parameters_[index];
}
// Get an expression from the expression stack.
Handle<Object> GetExpression(int index) {
DCHECK(0 <= index && index < expression_count());
return expression_stack_[index];
}
private:
// Return the number of incoming arguments.
int parameters_count() { return static_cast<int>(parameters_.size()); }
// Return the height of the expression stack.
int expression_count() { return static_cast<int>(expression_stack_.size()); }
// Set an incoming argument.
void SetParameter(int index, Handle<Object> obj) {
DCHECK(0 <= index && index < parameters_count());
parameters_[index] = obj;
}
// Set an expression on the expression stack.
void SetExpression(int index, Handle<Object> obj) {
DCHECK(0 <= index && index < expression_count());
expression_stack_[index] = obj;
}
Handle<Object> context_;
std::vector<Handle<Object>> parameters_;
std::vector<Handle<Object>> expression_stack_;
friend class Deoptimizer;
};
} // namespace internal
} // namespace v8
#endif // V8_DEOPTIMIZER_DEOPTIMIZED_FRAME_INFO_H_
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