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// Copyright 2016 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_SOURCE_POSITION_TABLE_H_
#define V8_SOURCE_POSITION_TABLE_H_
#include "src/assert-scope.h"
#include "src/checks.h"
#include "src/globals.h"
#include "src/handles.h"
#include "src/zone/zone-containers.h"
namespace v8 {
namespace internal {
class AbstractCode;
class BytecodeArray;
class ByteArray;
class Isolate;
class Zone;
struct PositionTableEntry {
PositionTableEntry()
: code_offset(0), source_position(0), is_statement(false) {}
PositionTableEntry(int offset, int source, bool statement)
: code_offset(offset), source_position(source), is_statement(statement) {}
int code_offset;
int source_position;
bool is_statement;
};
class V8_EXPORT_PRIVATE SourcePositionTableBuilder {
public:
enum RecordingMode { OMIT_SOURCE_POSITIONS, RECORD_SOURCE_POSITIONS };
SourcePositionTableBuilder(Zone* zone,
RecordingMode mode = RECORD_SOURCE_POSITIONS);
void AddPosition(size_t code_offset, int source_position, bool is_statement);
Handle<ByteArray> ToSourcePositionTable(Isolate* isolate,
Handle<AbstractCode> code);
private:
void AddEntry(const PositionTableEntry& entry);
inline bool Omit() const { return mode_ == OMIT_SOURCE_POSITIONS; }
RecordingMode mode_;
ZoneVector<byte> bytes_;
#ifdef ENABLE_SLOW_DCHECKS
ZoneVector<PositionTableEntry> raw_entries_;
#endif
PositionTableEntry previous_; // Previously written entry, to compute delta.
};
class V8_EXPORT_PRIVATE SourcePositionTableIterator {
public:
explicit SourcePositionTableIterator(ByteArray* byte_array);
void Advance();
int code_offset() const {
DCHECK(!done());
return current_.code_offset;
}
int source_position() const {
DCHECK(!done());
return current_.source_position;
}
bool is_statement() const {
DCHECK(!done());
return current_.is_statement;
}
bool done() const { return index_ == kDone; }
private:
static const int kDone = -1;
ByteArray* table_;
int index_;
PositionTableEntry current_;
DisallowHeapAllocation no_gc;
};
} // namespace internal
} // namespace v8
#endif // V8_SOURCE_POSITION_TABLE_H_