compiler-source-position-table.h

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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_COMPILER_SOURCE_POSITION_TABLE_H_
#define V8_COMPILER_COMPILER_SOURCE_POSITION_TABLE_H_
 
#include "src/base/compiler-specific.h"
#include "src/codegen/source-position.h"
#include "src/compiler/node-aux-data.h"
 
namespace v8 {
namespace internal {
namespace compiler {
 
class V8_EXPORT_PRIVATE SourcePositionTable final
    : public NON_EXPORTED_BASE(ZoneObject) {
 public:
  class V8_NODISCARD 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_; }
    Scope(const Scope&) = delete;
    Scope& operator=(const Scope&) = delete;
 
   private:
    void Init(SourcePosition position) {
      if (position.IsKnown()) source_positions_->current_position_ = position;
    }
 
    SourcePositionTable* const source_positions_;
    SourcePosition const prev_position_;
  };
 
  explicit SourcePositionTable(TFGraph* graph);
  SourcePositionTable(const SourcePositionTable&) = delete;
  SourcePositionTable& operator=(const SourcePositionTable&) = delete;
 
  void AddDecorator();
  void RemoveDecorator();
 
  SourcePosition GetSourcePosition(Node* node) const;
  SourcePosition GetSourcePosition(NodeId id) const;
  void SetSourcePosition(Node* node, SourcePosition position);
 
  void SetCurrentPosition(const SourcePosition& pos) {
    current_position_ = pos;
  }
  SourcePosition GetCurrentPosition() const { return current_position_; }
 
  void Disable() { enabled_ = false; }
  void Enable() { enabled_ = true; }
 
  bool IsEnabled() const { return enabled_; }
 
  void PrintJson(std::ostream& os) const;
 
 private:
  class Decorator;
 
  static SourcePosition UnknownSourcePosition(Zone* zone) {
    return SourcePosition::Unknown();
  }
 
  TFGraph* const graph_;
  Decorator* decorator_;
  SourcePosition current_position_;
  NodeAuxData<SourcePosition, UnknownSourcePosition> table_;
  bool enabled_ = true;
};
 
}  // namespace compiler
}  // namespace internal
}  // namespace v8
 
#endif  // V8_COMPILER_COMPILER_SOURCE_POSITION_TABLE_H_