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

src/x64/builtins-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 14 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "codegen.h"
 #include "deoptimizer.h"
 #include "full-codegen.h"
+#include "stub-cache.h"
 
 namespace v8 {
 namespace internal {
 
 
 #define __ ACCESS_MASM(masm)
 
 
 void Builtins::Generate_Adaptor(MacroAssembler* masm,
                                 CFunctionId id,
@@ skipping 774 matching lines @@
       __ SmiToInteger32(rax, rax);
     }
 
     // Restore the function to rdi.
     __ movq(rdi, args.GetReceiverOperand());
     __ jmp(&patch_receiver, Label::kNear);
 
     // Use the global receiver object from the called function as the
     // receiver.
     __ bind(&use_global_receiver);
-    const int kGlobalIndex =
-        Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize;
-    __ movq(rbx, FieldOperand(rsi, kGlobalIndex));
-    __ movq(rbx, FieldOperand(rbx, GlobalObject::kNativeContextOffset));
-    __ movq(rbx, FieldOperand(rbx, kGlobalIndex));
-    __ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalReceiverOffset));
+    CallStubCompiler::FetchGlobalProxy(masm, rdi, rbx);

[Toon Verwaest, 2013/12/18 13:09:33]

Maybe we should swap the arguments in FetchGlobalProxy, to have the target on
the left and the source on the right, as in most assembler-related functions.
Otherwise someone is guaranteed to swap them. (Probably me...)

 
     __ bind(&patch_receiver);
     __ movq(args.GetArgumentOperand(1), rbx);
 
     __ jmp(&shift_arguments);
   }
 
   // 3b. Check for function proxy.
   __ bind(&slow);
   __ Set(rdx, 1);  // indicate function proxy
@@ skipping 159 matching lines @@
 
     // Convert the receiver to an object.
     __ bind(&call_to_object);
     __ push(rbx);
     __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
     __ movq(rbx, rax);
     __ jmp(&push_receiver, Label::kNear);
 
     // Use the current global receiver object as the receiver.
     __ bind(&use_global_receiver);
-    const int kGlobalOffset =
-        Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize;
-    __ movq(rbx, FieldOperand(rsi, kGlobalOffset));
-    __ movq(rbx, FieldOperand(rbx, GlobalObject::kNativeContextOffset));
-    __ movq(rbx, FieldOperand(rbx, kGlobalOffset));
-    __ movq(rbx, FieldOperand(rbx, GlobalObject::kGlobalReceiverOffset));
-
+    CallStubCompiler::FetchGlobalProxy(masm, rdi, rbx);
     // Push the receiver.
     __ bind(&push_receiver);
     __ push(rbx);
 
     // Copy all arguments from the array to the stack.
     Label entry, loop;
     __ movq(rax, Operand(rbp, kIndexOffset));
     __ jmp(&entry);
     __ bind(&loop);
     __ movq(rdx, Operand(rbp, kArgumentsOffset));  // load arguments
@@ skipping 408 matching lines @@
   __ bind(&ok);
   __ ret(0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64