Check for function in %_CallFunction.

src/x64/full-codegen-x64.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 3306 matching lines @@
 void FullCodeGenerator::EmitCallFunction(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   ASSERT(args->length() >= 2);
 
   int arg_count = args->length() - 2;  // 2 ~ receiver and function.
   for (int i = 0; i < arg_count + 1; i++) {
     VisitForStackValue(args->at(i));
   }
   VisitForAccumulatorValue(args->last());  // Function.
 
-  // Check for proxy.
-  Label proxy, done;
-  __ CmpObjectType(rax, JS_FUNCTION_PROXY_TYPE, rbx);
-  __ j(equal, &proxy);
+  Label runtime, done;
+  // Check for non-function argument (including proxy).
+  __ JumpIfSmi(rax, &runtime);
+  __ CmpObjectType(rax, JS_FUNCTION_TYPE, rbx);
+  __ j(not_equal, &runtime);
 
   // InvokeFunction requires the function in rdi. Move it in there.
   __ movq(rdi, result_register());
   ParameterCount count(arg_count);
   __ InvokeFunction(rdi, count, CALL_FUNCTION,
                     NullCallWrapper(), CALL_AS_METHOD);
   __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
   __ jmp(&done);
 
-  __ bind(&proxy);
+  __ bind(&runtime);
   __ push(rax);
   __ CallRuntime(Runtime::kCall, args->length());
   __ bind(&done);
 
   context()->Plug(rax);
 }
 
 
 void FullCodeGenerator::EmitRegExpConstructResult(CallRuntime* expr) {
   RegExpConstructResultStub stub;
@@ skipping 1188 matching lines @@
   *context_length = 0;
   return previous_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64