Cleanup the handling of control flow in the toplevel code generator....

src/fast-codegen.h

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 223 matching lines @@
 
   // Return an operand used to read/write to a known (ie, non-LOOKUP) slot.
   // May emit code to traverse the context chain, destroying the scratch
   // register.
   MemOperand EmitSlotSearch(Slot* slot, Register scratch);
 
   // Test the JavaScript value in source as if in a test context, compile
   // control flow to a pair of labels.
   void TestAndBranch(Register source, Label* true_label, Label* false_label);
 
+  void VisitForControl(Expression* expr, Label* if_true, Label* if_false) {
+    ASSERT(expr->context() == Expression::kTest ||
+           expr->context() == Expression::kValueTest ||
+           expr->context() == Expression::kTestValue);
+    Label* saved_true = true_label_;
+    Label* saved_false = false_label_;
+    true_label_ = if_true;
+    false_label_ = if_false;
+    Visit(expr);
+    true_label_ = saved_true;
+    false_label_ = saved_false;
+  }
+
   void VisitDeclarations(ZoneList<Declaration*>* declarations);
   void DeclareGlobals(Handle<FixedArray> pairs);
 
   // Platform-specific return sequence
   void EmitReturnSequence(int position);
 
   // Platform-specific code sequences for calls
   void EmitCallWithStub(Call* expr);
   void EmitCallWithIC(Call* expr, Handle<Object> name, RelocInfo::Mode mode);
 
@@ skipping 75 matching lines @@
 
   friend class NestedStatement;
 
   DISALLOW_COPY_AND_ASSIGN(FastCodeGenerator);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FAST_CODEGEN_H_