Enable fast allocation of context objects on IA-32.

be2/src/codegen.h

 // Copyright 2006-2008 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 226 matching lines @@
  public:
   void Generate(MacroAssembler* masm);
 
  private:
   const char* GetName() { return "FastNewClosureStub"; }
   Major MajorKey() { return FastNewClosure; }
   int MinorKey() { return 0; }
 };
 
 
+class FastNewContextStub : public CodeStub {
+ public:
+  static const int kMaximumSlots = 64;
+
+  explicit FastNewContextStub(int slots) : slots_(slots) {
+    ASSERT(slots_ > 0 && slots <= kMaximumSlots);
+  }
+
+  void Generate(MacroAssembler* masm);
+
+ private:
+  int slots_;
+
+  const char* GetName() { return "FastNewContextStub"; }
+  Major MajorKey() { return FastNewContext; }
+  int MinorKey() { return slots_; }
+};
+
+
 class InstanceofStub: public CodeStub {
  public:
   InstanceofStub() { }
 
   void Generate(MacroAssembler* masm);
 
  private:
   Major MajorKey() { return Instanceof; }
   int MinorKey() { return 0; }
 };
@@ skipping 172 matching lines @@
     PrintF("ArgumentsAccessStub (type %d)\n", type_);
   }
 #endif
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODEGEN_H_