1 files changed, 82 insertions, 0 deletions
diff --git a/deps/v8/src/interpreter/source-position-table.h b/deps/v8/src/interpreter/source-position-table.h
new file mode 100644
index 0000000000..336cf42bc2
--- /dev/null
+++ b/deps/v8/src/interpreter/source-position-table.h
@@ -0,0 +1,82 @@
+// 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_INTERPRETER_SOURCE_POSITION_TABLE_H_
+#define V8_INTERPRETER_SOURCE_POSITION_TABLE_H_
+
+#include "src/assert-scope.h"
+#include "src/handles.h"
+#include "src/zone.h"
+#include "src/zone-containers.h"
+
+namespace v8 {
+namespace internal {
+
+class BytecodeArray;
+class FixedArray;
+class Isolate;
+
+namespace interpreter {
+
+class SourcePositionTableBuilder {
+ public:
+  explicit SourcePositionTableBuilder(Isolate* isolate, Zone* zone)
+      : isolate_(isolate), entries_(zone) {}
+
+  void AddStatementPosition(size_t bytecode_offset, int source_position);
+  void AddExpressionPosition(size_t bytecode_offset, int source_position);
+  void RevertPosition(size_t bytecode_offset);
+  Handle<FixedArray> ToFixedArray();
+
+ private:
+  struct Entry {
+    int bytecode_offset;
+    uint32_t source_position_and_type;
+  };
+
+  bool CodeOffsetHasPosition(int bytecode_offset) {
+    // Return whether bytecode offset already has a position assigned.
+    return entries_.size() > 0 &&
+           entries_.back().bytecode_offset == bytecode_offset;
+  }
+
+  Isolate* isolate_;
+  ZoneVector<Entry> entries_;
+};
+
+class SourcePositionTableIterator {
+ public:
+  explicit SourcePositionTableIterator(BytecodeArray* bytecode_array);
+
+  void Advance();
+
+  int bytecode_offset() const {
+    DCHECK(!done());
+    return bytecode_offset_;
+  }
+  int source_position() const {
+    DCHECK(!done());
+    return source_position_;
+  }
+  bool is_statement() const {
+    DCHECK(!done());
+    return is_statement_;
+  }
+  bool done() const { return index_ > length_; }
+
+ private:
+  FixedArray* table_;
+  int index_;
+  int length_;
+  bool is_statement_;
+  int bytecode_offset_;
+  int source_position_;
+  DisallowHeapAllocation no_gc;
+};
+
+}  // namespace interpreter
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_INTERPRETER_SOURCE_POSITION_TABLE_H_