[runtime] [proxy] Implementing [[Call]]

src/arm64/builtins-arm64.cc

 // Copyright 2013 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_ARM64
 
 #include "src/arm64/frames-arm64.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
@@ skipping 1659 matching lines @@
 
   Label non_callable, non_function, non_smi;
   __ JumpIfSmi(x1, &non_callable);
   __ Bind(&non_smi);
   __ CompareObjectType(x1, x4, x5, JS_FUNCTION_TYPE);
   __ Jump(masm->isolate()->builtins()->CallFunction(mode),
           RelocInfo::CODE_TARGET, eq);
   __ Cmp(x5, JS_PROXY_TYPE);
   __ B(ne, &non_function);
 
-  // 1. Call to proxy.
-  // TODO(neis): This doesn't match the ES6 spec for [[Call]] on proxies.
+  // 1. Runtime fallback for Proxy [[Call]].
+  __ Push(x1);
+  // Increase the arguments size to include the pushed function and the
+  // existing receiver on the stack.
+  __ Add(x0, x0, Operand(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.
   __ Ldrb(x4, FieldMemOperand(x4, Map::kBitFieldOffset));
   __ TestAndBranchIfAllClear(x4, 1 << Map::kIsCallable, &non_callable);
   // Overwrite the original receiver with the (original) target.
   __ Poke(x1, Operand(x0, LSL, kXRegSizeLog2));
   // Let the "call_as_function_delegate" take care of the rest.
@@ skipping 330 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM