[Interpreter] Add for/while/do support to the bytecode generator.

src/interpreter/control-flow-builders.h

Index: src/interpreter/control-flow-builders.h
diff --git a/src/interpreter/control-flow-builders.h b/src/interpreter/control-flow-builders.h
new file mode 100644
index 0000000000000000000000000000000000000000..d8be9814ef61c14586b8c4f12ddef271146703e1
--- /dev/null
+++ b/src/interpreter/control-flow-builders.h
@@ -0,0 +1,60 @@
+// 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_CONTROL_FLOW_BUILDERS_H_
+#define V8_INTERPRETER_CONTROL_FLOW_BUILDERS_H_
+
+#include "src/interpreter/bytecode-array-builder.h"
+
+#include "src/zone-containers.h"
+
+namespace v8 {
+namespace internal {
+namespace interpreter {
+
+class ControlFlowBuilder BASE_EMBEDDED {
+ public:
+  explicit ControlFlowBuilder(BytecodeArrayBuilder* builder)
+      : builder_(builder) {}
+  virtual ~ControlFlowBuilder() {}
+
+ protected:
+  BytecodeArrayBuilder* builder() const { return builder_; }
+
+ private:
+  BytecodeArrayBuilder* builder_;
+
+  DISALLOW_COPY_AND_ASSIGN(ControlFlowBuilder);
+};
+
+
+class LoopBuilder : public ControlFlowBuilder {
+ public:
+  explicit LoopBuilder(BytecodeArrayBuilder* builder)
+      : ControlFlowBuilder(builder),
+        continue_labels_(builder->zone()),
+        break_labels_(builder->zone()) {}
+  ~LoopBuilder();
+
+  BytecodeLabel* continue_label() { return &continue_label_; }
+  BytecodeLabel* break_label() { return &break_label_; }
+
+  void Break();
+  void Continue();
+
+ private:
+  void BindLabels(BytecodeLabel* target, ZoneVector<BytecodeLabel>* labels);
+
+  BytecodeLabel continue_label_;
+  BytecodeLabel break_label_;
+
+  ZoneVector<BytecodeLabel> continue_labels_;
+  ZoneVector<BytecodeLabel> break_labels_;
+};
+
+}  // namespace interpreter
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_INTERPRETER_CONTROL_FLOW_BUILDERS_H_