Use unspilled frames in unary operations.

src/virtual-frame-ia32.h

 // Copyright 2008 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 241 matching lines @@
 
   // An element of the expression stack as an assembly operand.
   Operand ElementAt(int index) const {
     return Operand(esp, index * kPointerSize);
   }
 
   // Random-access store to a frame-top relative frame element.  The result
   // becomes owned by the frame and is invalidated.
   void SetElementAt(int index, Result* value);
 
+  // Set a frame element to a constant.  The index is frame-top relative.
+  void SetElementAt(int index, Handle<Object> value) {
+    Result temp(value, cgen_);
+    SetElementAt(index, &temp);
+  }
+
   // A frame-allocated local as an assembly operand.
   Operand LocalAt(int index) const {
     ASSERT(0 <= index);
     ASSERT(index < local_count_);
     return Operand(ebp, kLocal0Offset - index * kPointerSize);
   }
 
   // Push a copy of the value of a local frame slot on top of the frame.
   void LoadLocalAt(int index) {
     LoadFrameSlotAt(local0_index() + index);
@@ skipping 62 matching lines @@
                   Result* arg1,
                   int frame_arg_count);
 
   // Call the runtime, given the number of arguments expected on (and
   // removed from) the top of the physical frame.
   Result CallRuntime(Runtime::Function* f, int frame_arg_count);
   Result CallRuntime(Runtime::FunctionId id, int frame_arg_count);
 
   // Invoke a builtin, given the number of arguments it expects on (and
   // removes from) the top of the physical frame.
-  void InvokeBuiltin(Builtins::JavaScript id,
-                     InvokeFlag flag,
-                     int frame_arg_count);
+  Result InvokeBuiltin(Builtins::JavaScript id,
+                       InvokeFlag flag,
+                       int frame_arg_count);
 
   // Call into a JS code object, given the number of arguments it expects on
   // (and removes from) the top of the physical frame.
   Result CallCodeObject(Handle<Code> ic,
                         RelocInfo::Mode rmode,
                         int frame_arg_count);
 
   // Drop a number of elements from the top of the expression stack.  May
   // emit code to affect the physical frame.  Does not clobber any registers
   // excepting possibly the stack pointer.
@@ skipping 165 matching lines @@
   // Called after all register-to-memory and register-to-register
   // moves have been made.  After this function returns, the frames
   // should be equal.
   void MergeMoveMemoryToRegisters(VirtualFrame* expected);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_VIRTUAL_FRAME_IA32_H_