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// Copyright 2014 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_COMPILER_SOURCE_POSITION_H_
#define V8_COMPILER_SOURCE_POSITION_H_
#include "src/compiler/node-aux-data.h"
#include "src/globals.h"
namespace v8 {
namespace internal {
namespace compiler {
// Encapsulates encoding and decoding of sources positions from which Nodes
// originated.
class SourcePosition final {
public:
explicit SourcePosition(int raw = kUnknownPosition) : raw_(raw) {}
static SourcePosition Unknown() { return SourcePosition(kUnknownPosition); }
bool IsUnknown() const { return raw() == kUnknownPosition; }
bool IsKnown() const { return raw() != kUnknownPosition; }
int raw() const { return raw_; }
private:
static const int kUnknownPosition = kNoSourcePosition;
int raw_;
};
inline bool operator==(const SourcePosition& lhs, const SourcePosition& rhs) {
return lhs.raw() == rhs.raw();
}
inline bool operator!=(const SourcePosition& lhs, const SourcePosition& rhs) {
return !(lhs == rhs);
}
class SourcePositionTable final : public ZoneObject {
public:
class Scope final {
public:
Scope(SourcePositionTable* source_positions, SourcePosition position)
: source_positions_(source_positions),
prev_position_(source_positions->current_position_) {
Init(position);
}
Scope(SourcePositionTable* source_positions, Node* node)
: source_positions_(source_positions),
prev_position_(source_positions->current_position_) {
Init(source_positions_->GetSourcePosition(node));
}
~Scope() { source_positions_->current_position_ = prev_position_; }
private:
void Init(SourcePosition position) {
if (position.IsKnown()) source_positions_->current_position_ = position;
}
SourcePositionTable* const source_positions_;
SourcePosition const prev_position_;
DISALLOW_COPY_AND_ASSIGN(Scope);
};
explicit SourcePositionTable(Graph* graph);
void AddDecorator();
void RemoveDecorator();
SourcePosition GetSourcePosition(Node* node) const;
void SetSourcePosition(Node* node, SourcePosition position);
void Print(std::ostream& os) const;
private:
class Decorator;
Graph* const graph_;
Decorator* decorator_;
SourcePosition current_position_;
NodeAuxData<SourcePosition> table_;
DISALLOW_COPY_AND_ASSIGN(SourcePositionTable);
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_SOURCE_POSITION_H_
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