[Interpreter] Add support for for..in.

src/interpreter/control-flow-builders.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_CONTROL_FLOW_BUILDERS_H_
 #define V8_INTERPRETER_CONTROL_FLOW_BUILDERS_H_
 
 #include "src/interpreter/bytecode-array-builder.h"
 
 #include "src/zone-containers.h"
@@ skipping 31 matching lines @@
   // These methods should be called by the LoopBuilder owner before
   // destruction to update sites that emit jumps for break/continue.
   void SetContinueTarget(const BytecodeLabel& continue_target);
   void SetBreakTarget(const BytecodeLabel& break_target);
 
   // These methods are called when visiting break and continue
   // statements in the AST.  Inserts a jump to a unbound label that is
   // patched when the corresponding SetContinueTarget/SetBreakTarget
   // is called.
   void Break() { EmitJump(&break_sites_); }
+  void BreakIfTrue() { EmitJumpIfTrue(&break_sites_); }
+  void BreakIfUndefined() { EmitJumpIfUndefined(&break_sites_); }
+  void BreakIfNull() { EmitJumpIfNull(&break_sites_); }
   void Continue() { EmitJump(&continue_sites_); }
+  void ContinueIfTrue() { EmitJumpIfTrue(&continue_sites_); }
+  void ContinueIfUndefined() { EmitJumpIfUndefined(&continue_sites_); }
+  void ContinueIfNull() { EmitJumpIfNull(&continue_sites_); }
 
  private:
   void BindLabels(const BytecodeLabel& target, ZoneVector<BytecodeLabel>* site);
   void EmitJump(ZoneVector<BytecodeLabel>* labels);
+  void EmitJumpIfTrue(ZoneVector<BytecodeLabel>* labels);
+  void EmitJumpIfUndefined(ZoneVector<BytecodeLabel>* labels);
+  void EmitJumpIfNull(ZoneVector<BytecodeLabel>* labels);
 
   // Unbound labels that identify jumps for continue/break statements
   // in the code.
   ZoneVector<BytecodeLabel> continue_sites_;
   ZoneVector<BytecodeLabel> break_sites_;
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_CONTROL_FLOW_BUILDERS_H_