Fast allocation of block contexts.

src/code-stubs.h

 // Copyright 2011 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 44 matching lines @@
   /* them can't cause a new stub to be compiled, so compiling a call to */  \
   /* them is GC safe.  The ones below this line exist in many variants  */  \
   /* so code compiling a call to one can cause a GC.  This means they   */  \
   /* can't be called from other stubs, since stub generation code is    */  \
   /* not GC safe.                                                       */  \
   V(ConvertToDouble)                     \
   V(WriteInt32ToHeapNumber)              \
   V(StackCheck)                          \
   V(FastNewClosure)                      \
   V(FastNewContext)                      \
+  V(FastNewBlockContext)                 \
   V(FastCloneShallowArray)               \
   V(RevertToNumber)                      \
   V(ToBoolean)                           \
   V(ToNumber)                            \
   V(CounterOp)                           \
   V(ArgumentsAccess)                     \
   V(RegExpConstructResult)               \
   V(NumberToString)                      \
   V(CEntry)                              \
   V(JSEntry)                             \
@@ skipping 254 matching lines @@
 
   StrictModeFlag strict_mode_;
 };
 
 
 class FastNewContextStub : public CodeStub {
  public:
   static const int kMaximumSlots = 64;
 
   explicit FastNewContextStub(int slots) : slots_(slots) {
-    ASSERT(slots_ > 0 && slots <= kMaximumSlots);
+    ASSERT(slots_ > 0 && slots_ <= kMaximumSlots);
   }
 
   void Generate(MacroAssembler* masm);
 
  private:
   int slots_;
 
   Major MajorKey() { return FastNewContext; }
   int MinorKey() { return slots_; }
 };
 
 
+class FastNewBlockContextStub : public CodeStub {
+ public:
+  static const int kMaximumSlots = 64;
+
+  explicit FastNewBlockContextStub(int slots) : slots_(slots) {
+    ASSERT(slots_ > 0 && slots_ <= kMaximumSlots);
+  }
+
+  void Generate(MacroAssembler* masm);
+
+ private:
+  int slots_;
+
+  Major MajorKey() { return FastNewBlockContext; }
+  int MinorKey() { return slots_; }
+};
+
+
 class FastCloneShallowArrayStub : public CodeStub {
  public:
   // Maximum length of copied elements array.
   static const int kMaximumClonedLength = 8;
 
   enum Mode {
     CLONE_ELEMENTS,
     COPY_ON_WRITE_ELEMENTS
   };
 
@@ skipping 652 matching lines @@
                     bool result);
   void GenerateTypeTransition(MacroAssembler* masm);
 
   Register tos_;
   Types types_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_