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

src/full-codegen/arm64/full-codegen-arm64.cc

 // Copyright 2013 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_ARM64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 1350 matching lines @@
     __ B(done);
   }
 }
 
 
 void FullCodeGenerator::EmitGlobalVariableLoad(VariableProxy* proxy,
                                                TypeofMode typeof_mode) {
   Variable* var = proxy->var();
   DCHECK(var->IsUnallocatedOrGlobalSlot() ||
          (var->IsLookupSlot() && var->mode() == DYNAMIC_GLOBAL));
-  __ LoadGlobalObject(LoadDescriptor::ReceiverRegister());
+  __ Ldr(LoadDescriptor::ReceiverRegister(), GlobalObjectMemOperand());
   __ Mov(LoadDescriptor::NameRegister(), Operand(var->name()));
   __ Mov(LoadDescriptor::SlotRegister(),
          SmiFromSlot(proxy->VariableFeedbackSlot()));
   CallLoadIC(typeof_mode);
 }
 
 
 void FullCodeGenerator::EmitVariableLoad(VariableProxy* proxy,
                                          TypeofMode typeof_mode) {
   // Record position before possible IC call.
@@ skipping 839 matching lines @@
   }
 }
 
 
 void FullCodeGenerator::EmitVariableAssignment(Variable* var, Token::Value op,
                                                FeedbackVectorSlot slot) {
   ASM_LOCATION("FullCodeGenerator::EmitVariableAssignment");
   if (var->IsUnallocated()) {
     // Global var, const, or let.
     __ Mov(StoreDescriptor::NameRegister(), Operand(var->name()));
-    __ LoadGlobalObject(StoreDescriptor::ReceiverRegister());
+    __ Ldr(StoreDescriptor::ReceiverRegister(), GlobalObjectMemOperand());
     EmitLoadStoreICSlot(slot);
     CallStoreIC();
 
   } else if (var->mode() == LET && op != Token::INIT) {
     // Non-initializing assignment to let variable needs a write barrier.
     DCHECK(!var->IsLookupSlot());
     DCHECK(var->IsStackAllocated() || var->IsContextSlot());
     Label assign;
     MemOperand location = VarOperand(var, x1);
     __ Ldr(x10, location);
@@ skipping 1571 matching lines @@
 
   Label runtime, done;
 
   Register result = x0;
   __ Allocate(JSIteratorResult::kSize, result, x10, x11, &runtime, TAG_OBJECT);
   Register map_reg = x1;
   Register result_value = x2;
   Register boolean_done = x3;
   Register empty_fixed_array = x4;
   Register untagged_result = x5;
-  __ LoadNativeContextSlot(Context::ITERATOR_RESULT_MAP_INDEX, map_reg);
+  __ Ldr(map_reg, GlobalObjectMemOperand());
+  __ Ldr(map_reg,
+         FieldMemOperand(map_reg, JSGlobalObject::kNativeContextOffset));
+  __ Ldr(map_reg,
+         ContextMemOperand(map_reg, Context::ITERATOR_RESULT_MAP_INDEX));
   __ Pop(boolean_done);
   __ Pop(result_value);
   __ LoadRoot(empty_fixed_array, Heap::kEmptyFixedArrayRootIndex);
   STATIC_ASSERT(JSObject::kPropertiesOffset + kPointerSize ==
                 JSObject::kElementsOffset);
   STATIC_ASSERT(JSIteratorResult::kValueOffset + kPointerSize ==
                 JSIteratorResult::kDoneOffset);
   __ ObjectUntag(untagged_result, result);
   __ Str(map_reg, MemOperand(untagged_result, HeapObject::kMapOffset));
   __ Stp(empty_fixed_array, empty_fixed_array,
          MemOperand(untagged_result, JSObject::kPropertiesOffset));
   __ Stp(result_value, boolean_done,
          MemOperand(untagged_result, JSIteratorResult::kValueOffset));
   STATIC_ASSERT(JSIteratorResult::kSize == 5 * kPointerSize);
   __ B(&done);
 
   __ Bind(&runtime);
   __ CallRuntime(Runtime::kCreateIterResultObject, 2);
 
   __ Bind(&done);
   context()->Plug(x0);
 }
 
 
 void FullCodeGenerator::EmitLoadJSRuntimeFunction(CallRuntime* expr) {
   // Push undefined as the receiver.
   __ LoadRoot(x0, Heap::kUndefinedValueRootIndex);
   __ Push(x0);
 
-  __ LoadNativeContextSlot(expr->context_index(), x0);
+  __ Ldr(x0, GlobalObjectMemOperand());
+  __ Ldr(x0, FieldMemOperand(x0, JSGlobalObject::kNativeContextOffset));
+  __ Ldr(x0, ContextMemOperand(x0, expr->context_index()));
 }
 
 
 void FullCodeGenerator::EmitCallJSRuntimeFunction(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   int arg_count = args->length();
 
   SetCallPosition(expr, arg_count);
   __ Peek(x1, (arg_count + 1) * kPointerSize);
   __ Mov(x0, arg_count);
@@ skipping 68 matching lines @@
                            : Runtime::kDeleteProperty_Sloppy,
                        2);
         context()->Plug(x0);
       } else if (proxy != NULL) {
         Variable* var = proxy->var();
         // Delete of an unqualified identifier is disallowed in strict mode but
         // "delete this" is allowed.
         bool is_this = var->HasThisName(isolate());
         DCHECK(is_sloppy(language_mode()) || is_this);
         if (var->IsUnallocatedOrGlobalSlot()) {
-          __ LoadGlobalObject(x12);
+          __ Ldr(x12, GlobalObjectMemOperand());
           __ Mov(x11, Operand(var->name()));
           __ Push(x12, x11);
           __ CallRuntime(Runtime::kDeleteProperty_Sloppy, 2);
           context()->Plug(x0);
         } else if (var->IsStackAllocated() || var->IsContextSlot()) {
           // Result of deleting non-global, non-dynamic variables is false.
           // The subexpression does not have side effects.
           context()->Plug(is_this);
         } else {
           // Non-global variable.  Call the runtime to try to delete from the
@@ skipping 806 matching lines @@
   __ Bind(&allocate);
   __ Push(Smi::FromInt(JSIteratorResult::kSize));
   __ CallRuntime(Runtime::kAllocateInNewSpace, 1);
 
   __ Bind(&done_allocate);
   Register map_reg = x1;
   Register result_value = x2;
   Register boolean_done = x3;
   Register empty_fixed_array = x4;
   Register untagged_result = x5;
-  __ LoadNativeContextSlot(Context::ITERATOR_RESULT_MAP_INDEX, map_reg);
+  __ Ldr(map_reg, GlobalObjectMemOperand());
+  __ Ldr(map_reg,
+         FieldMemOperand(map_reg, JSGlobalObject::kNativeContextOffset));
+  __ Ldr(map_reg,
+         ContextMemOperand(map_reg, Context::ITERATOR_RESULT_MAP_INDEX));
   __ Pop(result_value);
   __ LoadRoot(boolean_done,
               done ? Heap::kTrueValueRootIndex : Heap::kFalseValueRootIndex);
   __ LoadRoot(empty_fixed_array, Heap::kEmptyFixedArrayRootIndex);
   STATIC_ASSERT(JSObject::kPropertiesOffset + kPointerSize ==
                 JSObject::kElementsOffset);
   STATIC_ASSERT(JSIteratorResult::kValueOffset + kPointerSize ==
                 JSIteratorResult::kDoneOffset);
   __ ObjectUntag(untagged_result, result);
   __ Str(map_reg, MemOperand(untagged_result, HeapObject::kMapOffset));
@@ skipping 36 matching lines @@
 
 
 void FullCodeGenerator::PushFunctionArgumentForContextAllocation() {
   Scope* closure_scope = scope()->ClosureScope();
   if (closure_scope->is_script_scope() ||
       closure_scope->is_module_scope()) {
     // Contexts nested in the native context have a canonical empty function
     // as their closure, not the anonymous closure containing the global
     // code.
     DCHECK(kSmiTag == 0);
-    __ LoadNativeContextSlot(Context::CLOSURE_INDEX, x10);
+    __ Ldr(x10, GlobalObjectMemOperand());
+    __ Ldr(x10, FieldMemOperand(x10, JSGlobalObject::kNativeContextOffset));
+    __ Ldr(x10, ContextMemOperand(x10, Context::CLOSURE_INDEX));
   } else if (closure_scope->is_eval_scope()) {
     // Contexts created by a call to eval have the same closure as the
     // context calling eval, not the anonymous closure containing the eval
     // code.  Fetch it from the context.
     __ Ldr(x10, ContextMemOperand(cp, Context::CLOSURE_INDEX));
   } else {
     DCHECK(closure_scope->is_function_scope());
     __ Ldr(x10, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   }
   __ Push(x10);
@@ skipping 152 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64