1 // Copyright 2016 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_SOURCE_POSITION_TABLE_H_ 6 #define V8_SOURCE_POSITION_TABLE_H_ 7 8 #include "src/assert-scope.h" 9 #include "src/checks.h" 10 #include "src/globals.h" 11 #include "src/source-position.h" 12 #include "src/zone/zone-containers.h" 13 14 namespace v8 { 15 namespace internal { 16 17 class AbstractCode; 18 class BytecodeArray; 19 class ByteArray; 20 template <typename T> 21 class Handle; 22 class Isolate; 23 class Zone; 24 25 struct PositionTableEntry { 26 PositionTableEntry() 27 : code_offset(0), source_position(0), is_statement(false) {} 28 PositionTableEntry(int offset, int64_t source, bool statement) 29 : code_offset(offset), source_position(source), is_statement(statement) {} 30 31 int code_offset; 32 int64_t source_position; 33 bool is_statement; 34 }; 35 36 class V8_EXPORT_PRIVATE SourcePositionTableBuilder { 37 public: 38 enum RecordingMode { OMIT_SOURCE_POSITIONS, RECORD_SOURCE_POSITIONS }; 39 40 SourcePositionTableBuilder(Zone* zone, 41 RecordingMode mode = RECORD_SOURCE_POSITIONS); 42 43 void AddPosition(size_t code_offset, SourcePosition source_position, 44 bool is_statement); 45 46 Handle<ByteArray> ToSourcePositionTable(Isolate* isolate, 47 Handle<AbstractCode> code); 48 49 private: 50 void AddEntry(const PositionTableEntry& entry); 51 52 inline bool Omit() const { return mode_ == OMIT_SOURCE_POSITIONS; } 53 54 RecordingMode mode_; 55 ZoneVector<byte> bytes_; 56 #ifdef ENABLE_SLOW_DCHECKS 57 ZoneVector<PositionTableEntry> raw_entries_; 58 #endif 59 PositionTableEntry previous_; // Previously written entry, to compute delta. 60 }; 61 62 class V8_EXPORT_PRIVATE SourcePositionTableIterator { 63 public: 64 explicit SourcePositionTableIterator(ByteArray* byte_array); 65 66 void Advance(); 67 68 int code_offset() const { 69 DCHECK(!done()); 70 return current_.code_offset; 71 } 72 SourcePosition source_position() const { 73 DCHECK(!done()); 74 return SourcePosition::FromRaw(current_.source_position); 75 } 76 bool is_statement() const { 77 DCHECK(!done()); 78 return current_.is_statement; 79 } 80 bool done() const { return index_ == kDone; } 81 82 private: 83 static const int kDone = -1; 84 85 ByteArray* table_; 86 int index_; 87 PositionTableEntry current_; 88 DisallowHeapAllocation no_gc; 89 }; 90 91 } // namespace internal 92 } // namespace v8 93 94 #endif // V8_SOURCE_POSITION_TABLE_H_ 95
