Introduce global contexts to represent lexical global scope(s).

src/x64/full-codegen-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 156 matching lines @@
         __ push(rdx);
       }
     }
   }
 
   bool function_in_register = true;
 
   // Possibly allocate a local context.
   int heap_slots = info->scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
   if (heap_slots > 0) {
-    Comment cmnt(masm_, "[ Allocate local context");
-    // Argument to NewContext is the function, which is still in rdi.
-    __ push(rdi);
-    if (heap_slots <= FastNewContextStub::kMaximumSlots) {
-      FastNewContextStub stub(heap_slots);
-      __ CallStub(&stub);
+    if (info->scope()->is_global_scope()) {
+      Comment cmnt(masm_, "[ Allocate global context");
+      // Argument to NewContext is the function, which is still in edi.

[Sven Panne, 2012/08/27 06:24:54]

copy-n-paste typo: should be rdi. Consider moving the push before the if.

[rossberg, 2012/08/27 09:07:16]

Done.

+      __ push(rdi);
+      __ Push(info->scope()->GetScopeInfo());
+      __ CallRuntime(Runtime::kNewGlobalContext, 2);
     } else {
-      __ CallRuntime(Runtime::kNewFunctionContext, 1);
+      Comment cmnt(masm_, "[ Allocate function context");
+      // Argument to NewContext is the function, which is still in edi.
+      __ push(rdi);
+      if (heap_slots <= FastNewContextStub::kMaximumSlots) {
+        FastNewContextStub stub(heap_slots);
+        __ CallStub(&stub);
+      } else {
+        __ CallRuntime(Runtime::kNewFunctionContext, 1);
+      }
     }
     function_in_register = false;
     // Context is returned in both rax and rsi.  It replaces the context
     // passed to us.  It's saved in the stack and kept live in rsi.
     __ movq(Operand(rbp, StandardFrameConstants::kContextOffset), rsi);
 
     // Copy any necessary parameters into the context.
     int num_parameters = info->scope()->num_parameters();
     for (int i = 0; i < num_parameters; i++) {
       Variable* var = scope()->parameter(i);
@@ skipping 4345 matching lines @@
   *context_length = 0;
   return previous_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64