Fast string construct stub (ia32 only for now).

src/x64/builtins-x64.cc

 // Copyright 2009 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 857 matching lines @@
 
   // Jump to the generic construct code in case the specialized code cannot
   // handle the construction.
   __ bind(&generic_constructor);
   Code* code = Builtins::builtin(Builtins::JSConstructStubGeneric);
   Handle<Code> generic_construct_stub(code);
   __ Jump(generic_construct_stub, RelocInfo::CODE_TARGET);
 }
 
 
+void Builtins::Generate_StringConstructCode(MacroAssembler* masm) {
+  // TODO(bug): implement custom construct stub.
+  // Generate a copy of the generic stub for now.
+  Generate_JSConstructStubGeneric(masm);
+}
+
+
 void Builtins::Generate_JSConstructCall(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- rax: number of arguments
   //  -- rdi: constructor function
   // -----------------------------------
 
   Label non_function_call;
   // Check that function is not a smi.
   __ JumpIfSmi(rdi, &non_function_call);
   // Check that function is a JSFunction.
@@ skipping 414 matching lines @@
   __ LeaveInternalFrame();
 
   // Do a tail-call of the compiled function.
   __ lea(rcx, FieldOperand(rax, Code::kHeaderSize));
   __ jmp(rcx);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64