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

src/ia32/code-stubs-ia32.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 71 matching lines @@
     CodeStubInterfaceDescriptor* descriptor) {
   // register state
   // edi -- constructor function
   // ebx -- type info cell with elements kind
   // eax -- number of arguments to the constructor function
   static Register registers[] = { edi, ebx };
   descriptor->register_param_count_ = 2;
   // stack param count needs (constructor pointer, and single argument)
   descriptor->stack_parameter_count_ = &eax;
   descriptor->register_params_ = registers;
-  descriptor->extra_expression_stack_count_ = 1;
+  descriptor->acting_as_js_function_ = true;
   descriptor->deoptimization_handler_ =
       FUNCTION_ADDR(ArrayConstructor_StubFailure);
 }
 
 
 void ArrayNoArgumentConstructorStub::InitializeInterfaceDescriptor(
     Isolate* isolate,
     CodeStubInterfaceDescriptor* descriptor) {
   InitializeArrayConstructorDescriptor(isolate, descriptor);
 }
@@ skipping 7726 matching lines @@
 void StubFailureTrampolineStub::Generate(MacroAssembler* masm) {
   ASSERT(!Serializer::enabled());
   bool save_fp_regs = CpuFeatures::IsSupported(SSE2);
   CEntryStub ces(1, save_fp_regs ? kSaveFPRegs : kDontSaveFPRegs);
   __ call(ces.GetCode(masm->isolate()), RelocInfo::CODE_TARGET);
   int parameter_count_offset =
       StubFailureTrampolineFrame::kCallerStackParameterCountFrameOffset;
   __ mov(ebx, MemOperand(ebp, parameter_count_offset));
   masm->LeaveFrame(StackFrame::STUB_FAILURE_TRAMPOLINE);
   __ pop(ecx);
-  __ lea(esp, MemOperand(esp, ebx, times_pointer_size,
-                         extra_expression_stack_count_ * kPointerSize));
+  int additional_offset = acting_as_js_function_ ? kPointerSize : 0;
+  __ lea(esp, MemOperand(esp, ebx, times_pointer_size, additional_offset));
   __ jmp(ecx);  // Return to IC Miss stub, continuation still on stack.
 }
 
 
 void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
   if (entry_hook_ != NULL) {
     ProfileEntryHookStub stub;
     masm->CallStub(&stub);
   }
 }
@@ skipping 20 matching lines @@
   // Restore ecx.
   __ pop(ecx);
   __ ret(0);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32