Fix GC issue in instanceof stub...

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 16 matching lines @@
 
 #ifndef V8_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "globals.h"
 
 namespace v8 {
 namespace internal {
 
 // List of code stubs used on all platforms. The order in this list is important
-// as only the stubs up to and including RecordWrite allows nested stub calls.
+// as only the stubs up to and including Instanceof allows nested stub calls.
 #define CODE_STUB_LIST_ALL_PLATFORMS(V)  \
   V(CallFunction)                        \
   V(GenericBinaryOp)                     \
   V(TypeRecordingBinaryOp)               \
   V(StringAdd)                           \
   V(StringCharAt)                        \
   V(SubString)                           \
   V(StringCompare)                       \
   V(SmiOp)                               \
   V(Compare)                             \
   V(CompareIC)                           \
   V(MathPow)                             \
   V(TranscendentalCache)                 \
-  V(RecordWrite)                         \
+  V(Instanceof)                          \
   V(ConvertToDouble)                     \
   V(WriteInt32ToHeapNumber)              \
   V(IntegerMod)                          \
   V(StackCheck)                          \
   V(FastNewClosure)                      \
   V(FastNewContext)                      \
   V(FastCloneShallowArray)               \
   V(GenericUnaryOp)                      \
   V(RevertToNumber)                      \
   V(ToBoolean)                           \
-  V(Instanceof)                          \
   V(CounterOp)                           \
   V(ArgumentsAccess)                     \
   V(RegExpExec)                          \
   V(RegExpConstructResult)               \
   V(NumberToString)                      \
   V(CEntry)                              \
   V(JSEntry)                             \
   V(DebuggerStatement)
 
 // List of code stubs only used on ARM platforms.
@@ skipping 100 matching lines @@
   virtual void Print() { PrintF("%s\n", GetName()); }
 #endif
 
   // Computes the key based on major and minor.
   uint32_t GetKey() {
     ASSERT(static_cast<int>(MajorKey()) < NUMBER_OF_IDS);
     return MinorKeyBits::encode(MinorKey()) |
            MajorKeyBits::encode(MajorKey());
   }
 
-  bool AllowsStubCalls() { return MajorKey() <= RecordWrite; }
+  bool AllowsStubCalls() { return MajorKey() <= Instanceof; }
 
   class MajorKeyBits: public BitField<uint32_t, 0, kMajorBits> {};
   class MinorKeyBits: public BitField<uint32_t, kMajorBits, kMinorBits> {};
 
   friend class BreakPointIterator;
 };
 
 
 // Helper interface to prepare to/restore after making runtime calls.
 class RuntimeCallHelper {
@@ skipping 716 matching lines @@
   void GenerateSlow(MacroAssembler* masm,
                     const RuntimeCallHelper& call_helper);
 
  private:
   StringCharCodeAtGenerator char_code_at_generator_;
   StringCharFromCodeGenerator char_from_code_generator_;
 
   DISALLOW_COPY_AND_ASSIGN(StringCharAtGenerator);
 };
 
+
+class AllowStubCallsScope {
+ public:
+  AllowStubCallsScope(MacroAssembler* masm, bool allow)
+       : masm_(masm), previous_allow_(masm->allow_stub_calls()) {
+    masm_->set_allow_stub_calls(allow);
+  }
+  ~AllowStubCallsScope() {
+    masm_->set_allow_stub_calls(previous_allow_);
+  }
+
+ private:
+  MacroAssembler* masm_;
+  bool previous_allow_;
+
+  DISALLOW_COPY_AND_ASSIGN(AllowStubCallsScope);
+};
+
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_