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

src/x64/builtins-x64.cc

Index: src/x64/builtins-x64.cc
diff --git a/src/x64/builtins-x64.cc b/src/x64/builtins-x64.cc
index aef91640a01687f133f5dcd68770c416b278968b..f64728f2d8510c5224fadf306c423f450c58c73d 100644
--- a/src/x64/builtins-x64.cc
+++ b/src/x64/builtins-x64.cc
@@ -32,6 +32,7 @@
 #include "codegen.h"
 #include "deoptimizer.h"
 #include "full-codegen.h"
+#include "stub-cache.h"
 
 namespace v8 {
 namespace internal {
@@ -826,12 +827,7 @@ void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
     // 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);
@@ -1011,13 +1007,7 @@ void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
 
     // 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);