Load the global proxy from the context of the target function.

src/x64/code-stubs-x64.cc

 // Copyright 2013 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 2535 matching lines @@
 }
 
 
 void CallFunctionStub::Generate(MacroAssembler* masm) {
   // rbx : cache cell for call target
   // rdi : the function to call
   Isolate* isolate = masm->isolate();
   Label slow, non_function;
   StackArgumentsAccessor args(rsp, argc_);
 
+  // Check that the function really is a JavaScript function.
+  __ JumpIfSmi(rdi, &non_function);
+
   // The receiver might implicitly be the global object. This is
   // indicated by passing the hole as the receiver to the call
   // function stub.
-  if (ReceiverMightBeImplicit()) {
-    Label call;
-    // Get the receiver from the stack.
-    __ movq(rax, args.GetReceiverOperand());
-    // Call as function is indicated with the hole.
-    __ CompareRoot(rax, Heap::kTheHoleValueRootIndex);
-    __ j(not_equal, &call, Label::kNear);
+  if (ReceiverMightBeImplicit() || ReceiverIsImplicit()) {
+    Label call, patch_current_context;
+    if (ReceiverMightBeImplicit()) {
+      // Get the receiver from the stack.
+      __ movq(rax, args.GetReceiverOperand());
+      // Call as function is indicated with the hole.
+      __ CompareRoot(rax, Heap::kTheHoleValueRootIndex);
+      __ j(not_equal, &call, Label::kNear);
+    }
     // Patch the receiver on the stack with the global receiver object.
+    // Goto slow case if we do not have a function.
+    __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
+    __ j(not_equal, &patch_current_context);
+    CallStubCompiler::FetchGlobalProxy(masm, rdi, rcx);
+    __ movq(args.GetReceiverOperand(), rcx);
+    __ jmp(&call, Label::kNear);
+    __ bind(&patch_current_context);
     __ movq(rcx, GlobalObjectOperand());
     __ movq(rcx, FieldOperand(rcx, GlobalObject::kGlobalReceiverOffset));
     __ movq(args.GetReceiverOperand(), rcx);
+    __ jmp(&slow);
     __ bind(&call);
+  } else {
+    // Goto slow case if we do not have a function.
+    __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
+    __ j(not_equal, &slow);
   }
 
-  // Check that the function really is a JavaScript function.
-  __ JumpIfSmi(rdi, &non_function);
-  // Goto slow case if we do not have a function.
-  __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
-  __ j(not_equal, &slow);
-
   if (RecordCallTarget()) {
     GenerateRecordCallTarget(masm);
   }
 
   // Fast-case: Just invoke the function.
   ParameterCount actual(argc_);
 
   if (ReceiverMightBeImplicit()) {
     Label call_as_function;
     __ CompareRoot(rax, Heap::kTheHoleValueRootIndex);
@@ skipping 3105 matching lines @@
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64