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

src/full-codegen/mips/full-codegen-mips.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_MIPS
 
 // Note on Mips implementation:
 //
 // The result_register() for mips is the 'v0' register, which is defined
 // by the ABI to contain function return values. However, the first
@@ skipping 199 matching lines @@
     int num_parameters = info->scope()->num_parameters();
     int first_parameter = info->scope()->has_this_declaration() ? -1 : 0;
     for (int i = first_parameter; i < num_parameters; i++) {
       Variable* var = (i == -1) ? scope()->receiver() : scope()->parameter(i);
       if (var->IsContextSlot()) {
         int parameter_offset = StandardFrameConstants::kCallerSPOffset +
                                  (num_parameters - 1 - i) * kPointerSize;
         // Load parameter from stack.
         __ lw(a0, MemOperand(fp, parameter_offset));
         // Store it in the context.
-        MemOperand target = ContextMemOperand(cp, var->index());
+        MemOperand target = ContextOperand(cp, var->index());
         __ sw(a0, target);
 
         // Update the write barrier.
         if (need_write_barrier) {
           __ RecordWriteContextSlot(
               cp, target.offset(), a0, a3, kRAHasBeenSaved, kDontSaveFPRegs);
         } else if (FLAG_debug_code) {
           Label done;
           __ JumpIfInNewSpace(cp, a0, &done);
           __ Abort(kExpectedNewSpaceObject);
@@ skipping 476 matching lines @@
   }
   return MemOperand(fp, offset);
 }
 
 
 MemOperand FullCodeGenerator::VarOperand(Variable* var, Register scratch) {
   DCHECK(var->IsContextSlot() || var->IsStackAllocated());
   if (var->IsContextSlot()) {
     int context_chain_length = scope()->ContextChainLength(var->scope());
     __ LoadContext(scratch, context_chain_length);
-    return ContextMemOperand(scratch, var->index());
+    return ContextOperand(scratch, var->index());
   } else {
     return StackOperand(var);
   }
 }
 
 
 void FullCodeGenerator::GetVar(Register dest, Variable* var) {
   // Use destination as scratch.
   MemOperand location = VarOperand(var, dest);
   __ lw(dest, location);
@@ skipping 85 matching lines @@
         __ LoadRoot(t0, Heap::kTheHoleValueRootIndex);
         __ sw(t0, StackOperand(variable));
       }
       break;
 
     case VariableLocation::CONTEXT:
       if (hole_init) {
         Comment cmnt(masm_, "[ VariableDeclaration");
         EmitDebugCheckDeclarationContext(variable);
           __ LoadRoot(at, Heap::kTheHoleValueRootIndex);
-          __ sw(at, ContextMemOperand(cp, variable->index()));
+          __ sw(at, ContextOperand(cp, variable->index()));
           // No write barrier since the_hole_value is in old space.
           PrepareForBailoutForId(proxy->id(), NO_REGISTERS);
       }
       break;
 
     case VariableLocation::LOOKUP: {
       Comment cmnt(masm_, "[ VariableDeclaration");
       __ li(a2, Operand(variable->name()));
       // Declaration nodes are always introduced in one of four modes.
       DCHECK(IsDeclaredVariableMode(mode));
@@ skipping 37 matching lines @@
       Comment cmnt(masm_, "[ FunctionDeclaration");
       VisitForAccumulatorValue(declaration->fun());
       __ sw(result_register(), StackOperand(variable));
       break;
     }
 
     case VariableLocation::CONTEXT: {
       Comment cmnt(masm_, "[ FunctionDeclaration");
       EmitDebugCheckDeclarationContext(variable);
       VisitForAccumulatorValue(declaration->fun());
-      __ sw(result_register(), ContextMemOperand(cp, variable->index()));
+      __ sw(result_register(), ContextOperand(cp, variable->index()));
       int offset = Context::SlotOffset(variable->index());
       // We know that we have written a function, which is not a smi.
       __ RecordWriteContextSlot(cp,
                                 offset,
                                 result_register(),
                                 a2,
                                 kRAHasBeenSaved,
                                 kDontSaveFPRegs,
                                 EMIT_REMEMBERED_SET,
                                 OMIT_SMI_CHECK);
@@ skipping 370 matching lines @@
                                                       Label* slow) {
   Register current = cp;
   Register next = a1;
   Register temp = a2;
 
   Scope* s = scope();
   while (s != NULL) {
     if (s->num_heap_slots() > 0) {
       if (s->calls_sloppy_eval()) {
         // Check that extension is NULL.
-        __ lw(temp, ContextMemOperand(current, Context::EXTENSION_INDEX));
+        __ lw(temp, ContextOperand(current, Context::EXTENSION_INDEX));
         __ Branch(slow, ne, temp, Operand(zero_reg));
       }
       // Load next context in chain.
-      __ lw(next, ContextMemOperand(current, Context::PREVIOUS_INDEX));
+      __ lw(next, ContextOperand(current, Context::PREVIOUS_INDEX));
       // Walk the rest of the chain without clobbering cp.
       current = next;
     }
     // If no outer scope calls eval, we do not need to check more
     // context extensions.
     if (!s->outer_scope_calls_sloppy_eval() || s->is_eval_scope()) break;
     s = s->outer_scope();
   }
 
   if (s->is_eval_scope()) {
     Label loop, fast;
     if (!current.is(next)) {
       __ Move(next, current);
     }
     __ bind(&loop);
     // Terminate at native context.
     __ lw(temp, FieldMemOperand(next, HeapObject::kMapOffset));
     __ LoadRoot(t0, Heap::kNativeContextMapRootIndex);
     __ Branch(&fast, eq, temp, Operand(t0));
     // Check that extension is NULL.
-    __ lw(temp, ContextMemOperand(next, Context::EXTENSION_INDEX));
+    __ lw(temp, ContextOperand(next, Context::EXTENSION_INDEX));
     __ Branch(slow, ne, temp, Operand(zero_reg));
     // Load next context in chain.
-    __ lw(next, ContextMemOperand(next, Context::PREVIOUS_INDEX));
+    __ lw(next, ContextOperand(next, Context::PREVIOUS_INDEX));
     __ Branch(&loop);
     __ bind(&fast);
   }
 
   // All extension objects were empty and it is safe to use a normal global
   // load machinery.
   EmitGlobalVariableLoad(proxy, typeof_mode);
 }
 
 
 MemOperand FullCodeGenerator::ContextSlotOperandCheckExtensions(Variable* var,
                                                                 Label* slow) {
   DCHECK(var->IsContextSlot());
   Register context = cp;
   Register next = a3;
   Register temp = t0;
 
   for (Scope* s = scope(); s != var->scope(); s = s->outer_scope()) {
     if (s->num_heap_slots() > 0) {
       if (s->calls_sloppy_eval()) {
         // Check that extension is NULL.
-        __ lw(temp, ContextMemOperand(context, Context::EXTENSION_INDEX));
+        __ lw(temp, ContextOperand(context, Context::EXTENSION_INDEX));
         __ Branch(slow, ne, temp, Operand(zero_reg));
       }
-      __ lw(next, ContextMemOperand(context, Context::PREVIOUS_INDEX));
+      __ lw(next, ContextOperand(context, Context::PREVIOUS_INDEX));
       // Walk the rest of the chain without clobbering cp.
       context = next;
     }
   }
   // Check that last extension is NULL.
-  __ lw(temp, ContextMemOperand(context, Context::EXTENSION_INDEX));
+  __ lw(temp, ContextOperand(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 ContextMemOperand(context, var->index());
+  return ContextOperand(context, var->index());
 }
 
 
 void FullCodeGenerator::EmitDynamicLookupFastCase(VariableProxy* proxy,
                                                   TypeofMode typeof_mode,
                                                   Label* slow, Label* done) {
   // Generate fast-case code for variables that might be shadowed by
   // eval-introduced variables.  Eval is used a lot without
   // introducing variables.  In those cases, we do not want to
   // perform a runtime call for all variables in the scope
@@ skipping 22 matching lines @@
     __ Branch(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());
+  __ lw(LoadDescriptor::ReceiverRegister(), GlobalObjectOperand());
   __ li(LoadDescriptor::NameRegister(), Operand(var->name()));
   __ li(LoadDescriptor::SlotRegister(),
         Operand(SmiFromSlot(proxy->VariableFeedbackSlot())));
   CallLoadIC(typeof_mode);
 }
 
 
 void FullCodeGenerator::EmitVariableLoad(VariableProxy* proxy,
                                          TypeofMode typeof_mode) {
   // Record position before possible IC call.
@@ skipping 786 matching lines @@
   Label allocate, done_allocate;
 
   __ Allocate(JSIteratorResult::kSize, v0, a2, a3, &allocate, TAG_OBJECT);
   __ jmp(&done_allocate);
 
   __ bind(&allocate);
   __ Push(Smi::FromInt(JSIteratorResult::kSize));
   __ CallRuntime(Runtime::kAllocateInNewSpace, 1);
 
   __ bind(&done_allocate);
-  __ LoadNativeContextSlot(Context::ITERATOR_RESULT_MAP_INDEX, a1);
+  __ lw(a1, ContextOperand(cp, Context::GLOBAL_OBJECT_INDEX));
+  __ lw(a1, FieldMemOperand(a1, JSGlobalObject::kNativeContextOffset));
+  __ lw(a1, ContextOperand(a1, Context::ITERATOR_RESULT_MAP_INDEX));
   __ pop(a2);
   __ LoadRoot(a3,
               done ? Heap::kTrueValueRootIndex : Heap::kFalseValueRootIndex);
   __ LoadRoot(t0, Heap::kEmptyFixedArrayRootIndex);
   __ sw(a1, FieldMemOperand(v0, HeapObject::kMapOffset));
   __ sw(t0, FieldMemOperand(v0, JSObject::kPropertiesOffset));
   __ sw(t0, FieldMemOperand(v0, JSObject::kElementsOffset));
   __ sw(a2, FieldMemOperand(v0, JSIteratorResult::kValueOffset));
   __ sw(a3, FieldMemOperand(v0, JSIteratorResult::kDoneOffset));
   STATIC_ASSERT(JSIteratorResult::kSize == 5 * kPointerSize);
@@ skipping 310 matching lines @@
   }
 }
 
 
 void FullCodeGenerator::EmitVariableAssignment(Variable* var, Token::Value op,
                                                FeedbackVectorSlot slot) {
   if (var->IsUnallocated()) {
     // Global var, const, or let.
     __ mov(StoreDescriptor::ValueRegister(), result_register());
     __ li(StoreDescriptor::NameRegister(), Operand(var->name()));
-    __ LoadGlobalObject(StoreDescriptor::ReceiverRegister());
+    __ lw(StoreDescriptor::ReceiverRegister(), GlobalObjectOperand());
     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, a1);
     __ lw(a3, location);
@@ skipping 1600 matching lines @@
 
 void FullCodeGenerator::EmitCreateIterResultObject(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK_EQ(2, args->length());
   VisitForStackValue(args->at(0));
   VisitForStackValue(args->at(1));
 
   Label runtime, done;
 
   __ Allocate(JSIteratorResult::kSize, v0, a2, a3, &runtime, TAG_OBJECT);
-  __ LoadNativeContextSlot(Context::ITERATOR_RESULT_MAP_INDEX, a1);
+  __ lw(a1, ContextOperand(cp, Context::GLOBAL_OBJECT_INDEX));
+  __ lw(a1, FieldMemOperand(a1, JSGlobalObject::kNativeContextOffset));
+  __ lw(a1, ContextOperand(a1, Context::ITERATOR_RESULT_MAP_INDEX));
   __ Pop(a2, a3);
   __ LoadRoot(t0, Heap::kEmptyFixedArrayRootIndex);
   __ sw(a1, FieldMemOperand(v0, HeapObject::kMapOffset));
   __ sw(t0, FieldMemOperand(v0, JSObject::kPropertiesOffset));
   __ sw(t0, FieldMemOperand(v0, JSObject::kElementsOffset));
   __ sw(a2, FieldMemOperand(v0, JSIteratorResult::kValueOffset));
   __ sw(a3, FieldMemOperand(v0, JSIteratorResult::kDoneOffset));
   STATIC_ASSERT(JSIteratorResult::kSize == 5 * kPointerSize);
   __ jmp(&done);
 
   __ bind(&runtime);
   __ CallRuntime(Runtime::kCreateIterResultObject, 2);
 
   __ bind(&done);
   context()->Plug(v0);
 }
 
 
 void FullCodeGenerator::EmitLoadJSRuntimeFunction(CallRuntime* expr) {
   // Push undefined as the receiver.
   __ LoadRoot(v0, Heap::kUndefinedValueRootIndex);
   __ push(v0);
 
-  __ LoadNativeContextSlot(expr->context_index(), v0);
+  __ lw(v0, GlobalObjectOperand());
+  __ lw(v0, FieldMemOperand(v0, JSGlobalObject::kNativeContextOffset));
+  __ lw(v0, ContextOperand(v0, expr->context_index()));
 }
 
 
 void FullCodeGenerator::EmitCallJSRuntimeFunction(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   int arg_count = args->length();
 
   SetCallPosition(expr, arg_count);
   __ lw(a1, MemOperand(sp, (arg_count + 1) * kPointerSize));
   __ li(a0, Operand(arg_count));
@@ skipping 70 matching lines @@
                            : Runtime::kDeleteProperty_Sloppy,
                        2);
         context()->Plug(v0);
       } 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(a2);
+          __ lw(a2, GlobalObjectOperand());
           __ li(a1, Operand(var->name()));
           __ Push(a2, a1);
           __ CallRuntime(Runtime::kDeleteProperty_Sloppy, 2);
           context()->Plug(v0);
         } 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 530 matching lines @@
 }
 
 
 void FullCodeGenerator::StoreToFrameField(int frame_offset, Register value) {
   DCHECK_EQ(POINTER_SIZE_ALIGN(frame_offset), frame_offset);
   __ sw(value, MemOperand(fp, frame_offset));
 }
 
 
 void FullCodeGenerator::LoadContextField(Register dst, int context_index) {
-  __ lw(dst, ContextMemOperand(cp, context_index));
+  __ lw(dst, ContextOperand(cp, context_index));
 }
 
 
 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.
-    __ LoadNativeContextSlot(Context::CLOSURE_INDEX, at);
+    __ lw(at, GlobalObjectOperand());
+    __ lw(at, FieldMemOperand(at, JSGlobalObject::kNativeContextOffset));
+    __ lw(at, ContextOperand(at, 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.
-    __ lw(at, ContextMemOperand(cp, Context::CLOSURE_INDEX));
+    __ lw(at, ContextOperand(cp, Context::CLOSURE_INDEX));
   } else {
     DCHECK(closure_scope->is_function_scope());
     __ lw(at, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   }
   __ push(at);
 }
 
 
 // ----------------------------------------------------------------------------
 // Non-local control flow support.
@@ skipping 136 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS