[interpreter] VisitForTest for bytecode generator

src/interpreter/bytecode-label.h

 // Copyright 2015 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_LABEL_H_
 #define V8_INTERPRETER_BYTECODE_LABEL_H_
 
+#include "src/zone-containers.h"
+
 namespace v8 {
 namespace internal {
 namespace interpreter {
 
+class BytecodeArrayBuilder;
+
 // A label representing a branch target in a bytecode array. When a
 // label is bound, it represents a known position in the bytecode
 // array. For labels that are forward references there can be at most
 // one reference whilst it is unbound.
 class BytecodeLabel final {
  public:
   BytecodeLabel() : bound_(false), offset_(kInvalidOffset) {}
 
   bool is_bound() const { return bound_; }
   size_t offset() const { return offset_; }
@@ skipping 20 matching lines @@
   //                    bound_   offset_
   //  UNSET             false    kInvalidOffset
   //  FORWARD_TARGET    false    Offset of referring jump
   //  BACKWARD_TARGET    true    Offset of label in bytecode array when bound
   bool bound_;
   size_t offset_;
 
   friend class BytecodeArrayWriter;
 };
 
+// Class representing a branch target of multiple jumps.
+class BytecodeLabels {
+ public:
+  explicit BytecodeLabels(Zone* zone) : labels_(zone) {}
+
+  BytecodeLabel* New();
+
+  void Bind(BytecodeArrayBuilder* builder);
+
+ private:
+  ZoneVector<BytecodeLabel> labels_;
+
+  DISALLOW_COPY_AND_ASSIGN(BytecodeLabels);
+};
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_LABEL_H_