[proxies] throw TypeError in [[Call]] if is_callable Map bit is unset

src/x64/builtins-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 2391 matching lines @@
 
   Label non_callable, non_function, non_smi;
   __ JumpIfSmi(rdi, &non_callable);
   __ bind(&non_smi);
   __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
   __ j(equal, masm->isolate()->builtins()->CallFunction(mode, tail_call_mode),
        RelocInfo::CODE_TARGET);
   __ CmpInstanceType(rcx, JS_BOUND_FUNCTION_TYPE);
   __ j(equal, masm->isolate()->builtins()->CallBoundFunction(tail_call_mode),
        RelocInfo::CODE_TARGET);
+
+  // Check if target has a [[Call]] internal method.
+  __ testb(FieldOperand(rcx, Map::kBitFieldOffset),
+           Immediate(1 << Map::kIsCallable));
+  __ j(zero, &non_callable);
+
   __ CmpInstanceType(rcx, JS_PROXY_TYPE);
   __ j(not_equal, &non_function);
 
   // 0. Prepare for tail call if necessary.
   if (tail_call_mode == TailCallMode::kAllow) {
     PrepareForTailCall(masm, rax, rbx, rcx, r8);
   }
 
   // 1. Runtime fallback for Proxy [[Call]].
   __ PopReturnAddressTo(kScratchRegister);
   __ Push(rdi);
   __ PushReturnAddressFrom(kScratchRegister);
   // Increase the arguments size to include the pushed function and the
   // existing receiver on the stack.
   __ addp(rax, Immediate(2));
   // Tail-call to the runtime.
   __ JumpToExternalReference(
       ExternalReference(Runtime::kJSProxyCall, masm->isolate()));
 
   // 2. Call to something else, which might have a [[Call]] internal method (if
   // not we raise an exception).
   __ bind(&non_function);
-  // Check if target has a [[Call]] internal method.
-  __ testb(FieldOperand(rcx, Map::kBitFieldOffset),
-           Immediate(1 << Map::kIsCallable));
-  __ j(zero, &non_callable, Label::kNear);
   // Overwrite the original receiver with the (original) target.
   __ movp(args.GetReceiverOperand(), rdi);
   // Let the "call_as_function_delegate" take care of the rest.
   __ LoadNativeContextSlot(Context::CALL_AS_FUNCTION_DELEGATE_INDEX, rdi);
   __ Jump(masm->isolate()->builtins()->CallFunction(
               ConvertReceiverMode::kNotNullOrUndefined, tail_call_mode),
           RelocInfo::CODE_TARGET);
 
   // 3. Call to something that is not callable.
   __ bind(&non_callable);
@@ skipping 293 matching lines @@
   __ ret(0);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64