Merge V8 5.3.332.45. DO NOT MERGE
Test: Manual
FPIIM-449
Change-Id: Id3254828b068abdea3cb10442e0172a8c9a98e03
(cherry picked from commit 13e2dadd00298019ed862f2b2fc5068bba730bcf)
diff --git a/src/interpreter/bytecode-dead-code-optimizer.h b/src/interpreter/bytecode-dead-code-optimizer.h
new file mode 100644
index 0000000..8d68e54
--- /dev/null
+++ b/src/interpreter/bytecode-dead-code-optimizer.h
@@ -0,0 +1,41 @@
+// 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_BYTECODE_DEAD_CODE_OPTIMIZER_H_
+#define V8_INTERPRETER_BYTECODE_DEAD_CODE_OPTIMIZER_H_
+
+#include "src/interpreter/bytecode-pipeline.h"
+
+namespace v8 {
+namespace internal {
+namespace interpreter {
+
+// An optimization stage for eliminating obviously dead code in bytecode
+// generation.
+class BytecodeDeadCodeOptimizer final : public BytecodePipelineStage,
+ public ZoneObject {
+ public:
+ explicit BytecodeDeadCodeOptimizer(BytecodePipelineStage* next_stage);
+
+ // BytecodePipelineStage interface.
+ void Write(BytecodeNode* node) override;
+ void WriteJump(BytecodeNode* node, BytecodeLabel* label) override;
+ void BindLabel(BytecodeLabel* label) override;
+ void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override;
+ Handle<BytecodeArray> ToBytecodeArray(
+ int fixed_register_count, int parameter_count,
+ Handle<FixedArray> handler_table) override;
+
+ private:
+ BytecodePipelineStage* next_stage_;
+ bool exit_seen_in_block_;
+
+ DISALLOW_COPY_AND_ASSIGN(BytecodeDeadCodeOptimizer);
+};
+
+} // namespace interpreter
+} // namespace internal
+} // namespace v8
+
+#endif // V8_INTERPRETER_BYTECODE_DEAD_CODE_OPTIMIZER_H_