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

src/full-codegen/mips/full-codegen-mips.cc

Index: src/full-codegen/mips/full-codegen-mips.cc
diff --git a/src/full-codegen/mips/full-codegen-mips.cc b/src/full-codegen/mips/full-codegen-mips.cc
index f79e10a918957747975d8d8e4293d2066da9f613..aedf3d81e3345e65c24e35337d9f4000c29a82ad 100644
--- a/src/full-codegen/mips/full-codegen-mips.cc
+++ b/src/full-codegen/mips/full-codegen-mips.cc
@@ -217,7 +217,7 @@ void FullCodeGenerator::Generate() {
         // Load parameter from stack.
         __ lw(a0, MemOperand(fp, parameter_offset));
         // Store it in the context.
-        MemOperand target = ContextOperand(cp, var->index());
+        MemOperand target = ContextMemOperand(cp, var->index());
         __ sw(a0, target);
 
         // Update the write barrier.
@@ -714,7 +714,7 @@ MemOperand FullCodeGenerator::VarOperand(Variable* var, Register scratch) {
   if (var->IsContextSlot()) {
     int context_chain_length = scope()->ContextChainLength(var->scope());
     __ LoadContext(scratch, context_chain_length);
-    return ContextOperand(scratch, var->index());
+    return ContextMemOperand(scratch, var->index());
   } else {
     return StackOperand(var);
   }
@@ -820,7 +820,7 @@ void FullCodeGenerator::VisitVariableDeclaration(
         Comment cmnt(masm_, "[ VariableDeclaration");
         EmitDebugCheckDeclarationContext(variable);
           __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
-          __ sw(at, ContextOperand(cp, variable->index()));
+          __ sw(at, ContextMemOperand(cp, variable->index()));
           // No write barrier since the_hole_value is in old space.
           PrepareForBailoutForId(proxy->id(), NO_REGISTERS);
       }
@@ -878,7 +878,7 @@ void FullCodeGenerator::VisitFunctionDeclaration(
       Comment cmnt(masm_, "[ FunctionDeclaration");
       EmitDebugCheckDeclarationContext(variable);
       VisitForAccumulatorValue(declaration->fun());
-      __ sw(result_register(), ContextOperand(cp, variable->index()));
+      __ sw(result_register(), ContextMemOperand(cp, variable->index()));
       int offset = Context::SlotOffset(variable->index());
       // We know that we have written a function, which is not a smi.
       __ RecordWriteContextSlot(cp,
@@ -1269,11 +1269,11 @@ void FullCodeGenerator::EmitLoadGlobalCheckExtensions(VariableProxy* proxy,
     if (s->num_heap_slots() > 0) {
       if (s->calls_sloppy_eval()) {
         // Check that extension is NULL.
-        __ lw(temp, ContextOperand(current, Context::EXTENSION_INDEX));
+        __ lw(temp, ContextMemOperand(current, Context::EXTENSION_INDEX));
         __ Branch(slow, ne, temp, Operand(zero_reg));
       }
       // Load next context in chain.
-      __ lw(next, ContextOperand(current, Context::PREVIOUS_INDEX));
+      __ lw(next, ContextMemOperand(current, Context::PREVIOUS_INDEX));
       // Walk the rest of the chain without clobbering cp.
       current = next;
     }
@@ -1294,10 +1294,10 @@ void FullCodeGenerator::EmitLoadGlobalCheckExtensions(VariableProxy* proxy,
     __ LoadRoot(t0, Heap::kNativeContextMapRootIndex);
     __ Branch(&fast, eq, temp, Operand(t0));
     // Check that extension is NULL.
-    __ lw(temp, ContextOperand(next, Context::EXTENSION_INDEX));
+    __ lw(temp, ContextMemOperand(next, Context::EXTENSION_INDEX));
     __ Branch(slow, ne, temp, Operand(zero_reg));
     // Load next context in chain.
-    __ lw(next, ContextOperand(next, Context::PREVIOUS_INDEX));
+    __ lw(next, ContextMemOperand(next, Context::PREVIOUS_INDEX));
     __ Branch(&loop);
     __ bind(&fast);
   }
@@ -1319,22 +1319,22 @@ MemOperand FullCodeGenerator::ContextSlotOperandCheckExtensions(Variable* var,
     if (s->num_heap_slots() > 0) {
       if (s->calls_sloppy_eval()) {
         // Check that extension is NULL.
-        __ lw(temp, ContextOperand(context, Context::EXTENSION_INDEX));
+        __ lw(temp, ContextMemOperand(context, Context::EXTENSION_INDEX));
         __ Branch(slow, ne, temp, Operand(zero_reg));
       }
-      __ lw(next, ContextOperand(context, Context::PREVIOUS_INDEX));
+      __ lw(next, ContextMemOperand(context, Context::PREVIOUS_INDEX));
       // Walk the rest of the chain without clobbering cp.
       context = next;
     }
   }
   // Check that last extension is NULL.
-  __ lw(temp, ContextOperand(context, Context::EXTENSION_INDEX));
+  __ lw(temp, ContextMemOperand(context, Context::EXTENSION_INDEX));
   __ Branch(slow, ne, temp, Operand(zero_reg));
 
   // This function is used only for loads, not stores, so it's safe to
   // return an cp-based operand (the write barrier cannot be allowed to
   // destroy the cp register).
-  return ContextOperand(context, var->index());
+  return ContextMemOperand(context, var->index());
 }
 
 
@@ -1377,7 +1377,7 @@ void FullCodeGenerator::EmitGlobalVariableLoad(VariableProxy* proxy,
   Variable* var = proxy->var();
   DCHECK(var->IsUnallocatedOrGlobalSlot() ||
          (var->IsLookupSlot() && var->mode() == DYNAMIC_GLOBAL));
-  __ lw(LoadDescriptor::ReceiverRegister(), GlobalObjectOperand());
+  __ LoadGlobalObject(LoadDescriptor::ReceiverRegister());
   __ li(LoadDescriptor::NameRegister(), Operand(var->name()));
   __ li(LoadDescriptor::SlotRegister(),
         Operand(SmiFromSlot(proxy->VariableFeedbackSlot())));
@@ -2184,9 +2184,7 @@ void FullCodeGenerator::EmitCreateIteratorResult(bool done) {
   __ CallRuntime(Runtime::kAllocateInNewSpace, 1);
 
   __ bind(&done_allocate);
-  __ lw(a1, ContextOperand(cp, Context::GLOBAL_OBJECT_INDEX));
-  __ lw(a1, FieldMemOperand(a1, JSGlobalObject::kNativeContextOffset));
-  __ lw(a1, ContextOperand(a1, Context::ITERATOR_RESULT_MAP_INDEX));
+  __ LoadNativeContextSlot(Context::ITERATOR_RESULT_MAP_INDEX, a1);
   __ pop(a2);
   __ LoadRoot(a3,
               done ? Heap::kTrueValueRootIndex : Heap::kFalseValueRootIndex);
@@ -2517,7 +2515,7 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var, Token::Value op,
     // Global var, const, or let.
     __ mov(StoreDescriptor::ValueRegister(), result_register());
     __ li(StoreDescriptor::NameRegister(), Operand(var->name()));
-    __ lw(StoreDescriptor::ReceiverRegister(), GlobalObjectOperand());
+    __ LoadGlobalObject(StoreDescriptor::ReceiverRegister());
     EmitLoadStoreICSlot(slot);
     CallStoreIC();
 
@@ -4138,9 +4136,7 @@ void FullCodeGenerator::EmitCreateIterResultObject(CallRuntime* expr) {
   Label runtime, done;
 
   __ Allocate(JSIteratorResult::kSize, v0, a2, a3, &runtime, TAG_OBJECT);
-  __ lw(a1, ContextOperand(cp, Context::GLOBAL_OBJECT_INDEX));
-  __ lw(a1, FieldMemOperand(a1, JSGlobalObject::kNativeContextOffset));
-  __ lw(a1, ContextOperand(a1, Context::ITERATOR_RESULT_MAP_INDEX));
+  __ LoadNativeContextSlot(Context::ITERATOR_RESULT_MAP_INDEX, a1);
   __ Pop(a2, a3);
   __ LoadRoot(t0, Heap::kEmptyFixedArrayRootIndex);
   __ sw(a1, FieldMemOperand(v0, HeapObject::kMapOffset));
@@ -4164,9 +4160,7 @@ void FullCodeGenerator::EmitLoadJSRuntimeFunction(CallRuntime* expr) {
   __ LoadRoot(v0, Heap::kUndefinedValueRootIndex);
   __ push(v0);
 
-  __ lw(v0, GlobalObjectOperand());
-  __ lw(v0, FieldMemOperand(v0, JSGlobalObject::kNativeContextOffset));
-  __ lw(v0, ContextOperand(v0, expr->context_index()));
+  __ LoadNativeContextSlot(expr->context_index(), v0);
 }
 
 
@@ -4257,7 +4251,7 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
         bool is_this = var->HasThisName(isolate());
         DCHECK(is_sloppy(language_mode()) || is_this);
         if (var->IsUnallocatedOrGlobalSlot()) {
-          __ lw(a2, GlobalObjectOperand());
+          __ LoadGlobalObject(a2);
           __ li(a1, Operand(var->name()));
           __ Push(a2, a1);
           __ CallRuntime(Runtime::kDeleteProperty_Sloppy, 2);
@@ -4808,7 +4802,7 @@ void FullCodeGenerator::StoreToFrameField(int frame_offset, Register value) {
 
 
 void FullCodeGenerator::LoadContextField(Register dst, int context_index) {
-  __ lw(dst, ContextOperand(cp, context_index));
+  __ lw(dst, ContextMemOperand(cp, context_index));
 }
 
 
@@ -4819,14 +4813,12 @@ void FullCodeGenerator::PushFunctionArgumentForContextAllocation() {
     // Contexts nested in the native context have a canonical empty function
     // as their closure, not the anonymous closure containing the global
     // code.
-    __ lw(at, GlobalObjectOperand());
-    __ lw(at, FieldMemOperand(at, JSGlobalObject::kNativeContextOffset));
-    __ lw(at, ContextOperand(at, Context::CLOSURE_INDEX));
+    __ LoadNativeContextSlot(Context::CLOSURE_INDEX, at);
   } 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.
-    __ lw(at, ContextOperand(cp, Context::CLOSURE_INDEX));
+    __ lw(at, ContextMemOperand(cp, Context::CLOSURE_INDEX));
   } else {
     DCHECK(closure_scope->is_function_scope());
     __ lw(at, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));