Error found in test262 on ARM: BinaryOpStub could call out to a built-in and push …

src/x64/code-stubs-x64.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 189 matching lines @@
                                   Register hash,
                                   Register scratch);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(StringHelper);
 };
 
 
 // Flag that indicates how to generate code for the stub StringAddStub.
 enum StringAddFlags {
-  NO_STRING_ADD_FLAGS = 0,
+  NO_STRING_ADD_FLAGS = 1 << 0,
   // Omit left string check in stub (left is definitely a string).
-  NO_STRING_CHECK_LEFT_IN_STUB = 1 << 0,
+  NO_STRING_CHECK_LEFT_IN_STUB = 1 << 1,
   // Omit right string check in stub (right is definitely a string).
-  NO_STRING_CHECK_RIGHT_IN_STUB = 1 << 1,
+  NO_STRING_CHECK_RIGHT_IN_STUB = 1 << 2,
+  // Stub needs a frame before calling the runtime
+  ERECT_FRAME = 1 << 3,
   // Omit both string checks in stub.
   NO_STRING_CHECK_IN_STUB =
       NO_STRING_CHECK_LEFT_IN_STUB | NO_STRING_CHECK_RIGHT_IN_STUB
 };
 
 
 class StringAddStub: public PlatformCodeStub {
  public:
   explicit StringAddStub(StringAddFlags flags) : flags_(flags) {}
 
  private:
   Major MajorKey() { return StringAdd; }
   int MinorKey() { return flags_; }
 
   void Generate(MacroAssembler* masm);
 
   void GenerateConvertArgument(MacroAssembler* masm,
                                int stack_offset,
                                Register arg,
                                Register scratch1,
                                Register scratch2,
                                Register scratch3,
                                Label* slow);
 
+  void GenerateRegisterArgsPush(MacroAssembler* masm);
+  void GenerateRegisterArgsPop(MacroAssembler* masm, Register temp);
+
   const StringAddFlags flags_;
 };
 
 
 class SubStringStub: public PlatformCodeStub {
  public:
   SubStringStub() {}
 
  private:
   Major MajorKey() { return SubString; }
@@ skipping 367 matching lines @@
   RememberedSetAction remembered_set_action_;
   SaveFPRegsMode save_fp_regs_mode_;
   Label slow_;
   RegisterAllocation regs_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_CODE_STUBS_X64_H_