Deoptimizer support for hydrogen stubs that accept a variable number of arguments.

src/arm/code-stubs-arm.cc

 // Copyright 2012 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 77 matching lines @@
     CodeStubInterfaceDescriptor* descriptor) {
   // register state
   // r1 -- constructor function
   // r2 -- type info cell with elements kind
   // r0 -- number of arguments to the constructor function
   static Register registers[] = { r1, r2 };
   descriptor->register_param_count_ = 2;
   // stack param count needs (constructor pointer, and single argument)
   descriptor->stack_parameter_count_ = &r0;
   descriptor->register_params_ = registers;
-  descriptor->extra_expression_stack_count_ = 1;
+  descriptor->function_mode_ = JS_FUNCTION_STUB_MODE;
   descriptor->deoptimization_handler_ =
       FUNCTION_ADDR(ArrayConstructor_StubFailure);
 }
 
 
 void ArrayNoArgumentConstructorStub::InitializeInterfaceDescriptor(
     Isolate* isolate,
     CodeStubInterfaceDescriptor* descriptor) {
   InitializeArrayConstructorDescriptor(isolate, descriptor);
 }
@@ skipping 7846 matching lines @@
 
 
 void StubFailureTrampolineStub::Generate(MacroAssembler* masm) {
   ASSERT(!Serializer::enabled());
   bool save_fp_regs = CpuFeatures::IsSupported(VFP2);
   CEntryStub ces(1, save_fp_regs ? kSaveFPRegs : kDontSaveFPRegs);
   __ Call(ces.GetCode(masm->isolate()), RelocInfo::CODE_TARGET);
   int parameter_count_offset =
       StubFailureTrampolineFrame::kCallerStackParameterCountFrameOffset;
   __ ldr(r1, MemOperand(fp, parameter_count_offset));
+  if (function_mode_ == JS_FUNCTION_STUB_MODE) {
+    __ add(r1, r1, Operand(1));
+  }
   masm->LeaveFrame(StackFrame::STUB_FAILURE_TRAMPOLINE);
   __ mov(r1, Operand(r1, LSL, kPointerSizeLog2));
   __ add(sp, sp, r1);
   __ Ret();
 }
 
 
 void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
   if (entry_hook_ != NULL) {
     PredictableCodeSizeScope predictable(masm, 4 * Assembler::kInstrSize);
@@ skipping 51 matching lines @@
 
   __ Pop(lr, r5, r1);
   __ Ret();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM