[runtime] Replace global object link with native context link in all contexts.

src/ia32/macro-assembler-ia32.cc

 // Copyright 2012 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_IA32
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1051 matching lines @@
 
   // Load current lexical context from the stack frame.
   mov(scratch1, Operand(ebp, StandardFrameConstants::kContextOffset));
 
   // When generating debug code, make sure the lexical context is set.
   if (emit_debug_code()) {
     cmp(scratch1, Immediate(0));
     Check(not_equal, kWeShouldNotHaveAnEmptyLexicalContext);
   }
   // Load the native context of the current context.
-  int offset =
-      Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize;
-  mov(scratch1, FieldOperand(scratch1, offset));
-  mov(scratch1, FieldOperand(scratch1, JSGlobalObject::kNativeContextOffset));
+  mov(scratch1, ContextOperand(scratch1, Context::NATIVE_CONTEXT_INDEX));
 
   // Check the context is a native context.
   if (emit_debug_code()) {
     // Read the first word and compare to native_context_map.
     cmp(FieldOperand(scratch1, HeapObject::kMapOffset),
         isolate()->factory()->native_context_map());
     Check(equal, kJSGlobalObjectNativeContextShouldBeANativeContext);
   }
 
   // Check if both contexts are the same.
@@ skipping 1038 matching lines @@
   // parameter count to avoid emitting code to do the check.
   ParameterCount expected(0);
   GetBuiltinFunction(edi, native_context_index);
   InvokeFunctionCode(edi, no_reg, expected, expected, flag, call_wrapper);
 }
 
 
 void MacroAssembler::GetBuiltinFunction(Register target,
                                         int native_context_index) {
   // Load the JavaScript builtin function from the builtins object.
-  mov(target, GlobalObjectOperand());
-  mov(target, FieldOperand(target, JSGlobalObject::kNativeContextOffset));
+  mov(target, NativeContextOperand());
   mov(target, ContextOperand(target, native_context_index));
 }
 
 
 void MacroAssembler::LoadContext(Register dst, int context_chain_length) {
   if (context_chain_length > 0) {
     // Move up the chain of contexts to the context containing the slot.
     mov(dst, Operand(esi, Context::SlotOffset(Context::PREVIOUS_INDEX)));
     for (int i = 1; i < context_chain_length; i++) {
       mov(dst, Operand(dst, Context::SlotOffset(Context::PREVIOUS_INDEX)));
@@ skipping 11 matching lines @@
   // not CONTEXT.
   if (emit_debug_code()) {
     cmp(FieldOperand(dst, HeapObject::kMapOffset),
         isolate()->factory()->with_context_map());
     Check(not_equal, kVariableResolvedToWithContext);
   }
 }
 
 
 void MacroAssembler::LoadGlobalProxy(Register dst) {
-  mov(dst, GlobalObjectOperand());
-  mov(dst, FieldOperand(dst, JSGlobalObject::kGlobalProxyOffset));
+  mov(dst, NativeContextOperand());
+  mov(dst, ContextOperand(dst, Context::GLOBAL_PROXY_INDEX));
 }
 
 
 void MacroAssembler::LoadTransitionedArrayMapConditional(
     ElementsKind expected_kind,
     ElementsKind transitioned_kind,
     Register map_in_out,
     Register scratch,
     Label* no_map_match) {
   // Load the global or builtins object from the current context.
-  mov(scratch, Operand(esi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-  mov(scratch, FieldOperand(scratch, JSGlobalObject::kNativeContextOffset));
+  mov(scratch, NativeContextOperand());
 
   // Check that the function's map is the same as the expected cached map.
   mov(scratch, Operand(scratch,
                        Context::SlotOffset(Context::JS_ARRAY_MAPS_INDEX)));
 
   size_t offset = expected_kind * kPointerSize +
       FixedArrayBase::kHeaderSize;
   cmp(map_in_out, FieldOperand(scratch, offset));
   j(not_equal, no_map_match);
 
   // Use the transitioned cached map.
   offset = transitioned_kind * kPointerSize +
       FixedArrayBase::kHeaderSize;
   mov(map_in_out, FieldOperand(scratch, offset));
 }
 
 
 void MacroAssembler::LoadGlobalFunction(int index, Register function) {
-  // Load the global or builtins object from the current context.
-  mov(function,
-      Operand(esi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-  // Load the native context from the global or builtins object.
-  mov(function, FieldOperand(function, JSGlobalObject::kNativeContextOffset));
+  // Load the native context from the current context.
+  mov(function, NativeContextOperand());
   // Load the function from the native context.
-  mov(function, Operand(function, Context::SlotOffset(index)));
+  mov(function, ContextOperand(function, index));
 }
 
 
 void MacroAssembler::LoadGlobalFunctionInitialMap(Register function,
                                                   Register map) {
   // Load the initial map.  The global functions all have initial maps.
   mov(map, FieldOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
   if (emit_debug_code()) {
     Label ok, fail;
     CheckMap(map, isolate()->factory()->meta_map(), &fail, DO_SMI_CHECK);
@@ skipping 967 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32