Experimental: eagerly allocate space in the actual frame for spilling...

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 119 matching lines @@
   // the expected one.
   void MergeTo(VirtualFrame* expected);
 
   // Emit code for the physical JS entry and exit frame sequences.  After
   // calling Enter, the virtual frame is ready for use; and after calling
   // Exit it should not be used.  Note that Enter does not allocate space in
   // the physical frame for storing frame-allocated locals.
   void Enter();
   void Exit();
 
-  // Allocate and initialize the frame-allocated locals.  The number of
-  // locals is known from the frame's code generator's state (specifically
-  // its scope).  As a side effect, code may be emitted.
+  // Allocate and initialize the frame-allocated locals.  The eax register
+  // us clobbered.
   void AllocateStackSlots(int count);
 
   // The current top of the expression stack as an assembly operand.
   Operand Top() const { return Operand(esp, 0); }
 
   // An element of the expression stack as an assembly operand.
   Operand ElementAt(int index) const {
     return Operand(esp, index * kPointerSize);
   }
 
@@ skipping 108 matching lines @@
 
   // Spill the topmost elements of the frame to memory (eg, they are the
   // arguments to a call) and all registers.
   void PrepareForCall(int count);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_VIRTUAL_FRAME_IA32_H_