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91 lines
2.2 KiB
91 lines
2.2 KiB
8 years ago
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// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_SOURCE_POSITION_TABLE_H_
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#define V8_SOURCE_POSITION_TABLE_H_
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#include "src/assert-scope.h"
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#include "src/checks.h"
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#include "src/handles.h"
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#include "src/zone-containers.h"
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namespace v8 {
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namespace internal {
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class AbstractCode;
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class BytecodeArray;
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class ByteArray;
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class Isolate;
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class Zone;
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struct PositionTableEntry {
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PositionTableEntry()
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: code_offset(0), source_position(0), is_statement(false) {}
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PositionTableEntry(int offset, int source, bool statement)
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: code_offset(offset), source_position(source), is_statement(statement) {}
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int code_offset;
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int source_position;
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bool is_statement;
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};
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class SourcePositionTableBuilder {
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public:
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enum RecordingMode { OMIT_SOURCE_POSITIONS, RECORD_SOURCE_POSITIONS };
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SourcePositionTableBuilder(Zone* zone,
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RecordingMode mode = RECORD_SOURCE_POSITIONS);
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void AddPosition(size_t code_offset, int source_position, bool is_statement);
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Handle<ByteArray> ToSourcePositionTable(Isolate* isolate,
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Handle<AbstractCode> code);
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private:
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void AddEntry(const PositionTableEntry& entry);
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inline bool Omit() const { return mode_ == OMIT_SOURCE_POSITIONS; }
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RecordingMode mode_;
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ZoneVector<byte> bytes_;
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#ifdef ENABLE_SLOW_DCHECKS
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ZoneVector<PositionTableEntry> raw_entries_;
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#endif
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PositionTableEntry previous_; // Previously written entry, to compute delta.
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};
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class SourcePositionTableIterator {
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public:
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explicit SourcePositionTableIterator(ByteArray* byte_array);
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void Advance();
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int code_offset() const {
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DCHECK(!done());
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return current_.code_offset;
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}
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int source_position() const {
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DCHECK(!done());
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return current_.source_position;
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}
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bool is_statement() const {
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DCHECK(!done());
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return current_.is_statement;
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}
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bool done() const { return index_ == kDone; }
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private:
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static const int kDone = -1;
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ByteArray* table_;
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int index_;
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PositionTableEntry current_;
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DisallowHeapAllocation no_gc;
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_SOURCE_POSITION_TABLE_H_
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