Refactor lexical home object binding

src/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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS
 
 // Note on Mips implementation:
 //
@@ skipping 233 matching lines @@
         } else if (FLAG_debug_code) {
           Label done;
           __ JumpIfInNewSpace(cp, a0, &done);
           __ Abort(kExpectedNewSpaceObject);
           __ bind(&done);
         }
       }
     }
   }
 
-  Variable* home_object_var = scope()->home_object_var();
-  if (home_object_var != nullptr) {
-    __ Push(a1);
-  }
-
   // Possibly set up a local binding to the this function which is used in
   // derived constructors with super calls.
   Variable* this_function_var = scope()->this_function_var();
   if (this_function_var != nullptr) {
     Comment cmnt(masm_, "[ This function");
     SetVar(this_function_var, a1, a2, a3);
   }
 
   Variable* new_target_var = scope()->new_target_var();
   if (new_target_var != nullptr) {
@@ skipping 65 matching lines @@
       type = ArgumentsAccessStub::NEW_SLOPPY_SLOW;
     } else {
       type = ArgumentsAccessStub::NEW_SLOPPY_FAST;
     }
     ArgumentsAccessStub stub(isolate(), type, has_new_target);
     __ CallStub(&stub);
 
     SetVar(arguments, v0, a1, a2);
   }
 
-  // Possibly set up a local binding to the [[HomeObject]].
-  if (home_object_var != nullptr) {
-    Comment cmnt(masm_, "[ Home object");
-    __ Pop(LoadDescriptor::ReceiverRegister());
-    Handle<Symbol> home_object_symbol(isolate()->heap()->home_object_symbol());
-    __ li(LoadDescriptor::NameRegister(), Operand(home_object_symbol));
-    __ li(LoadDescriptor::SlotRegister(),
-          Operand(SmiFromSlot(function()->HomeObjectFeedbackSlot())));
-    CallLoadIC(NOT_CONTEXTUAL);
-
-    SetVar(home_object_var, v0, a1, a2);
-  }
-
   if (FLAG_trace) {
     __ CallRuntime(Runtime::kTraceEnter, 0);
   }
 
   // Visit the declarations and body unless there is an illegal
   // redeclaration.
   if (scope()->HasIllegalRedeclaration()) {
     Comment cmnt(masm_, "[ Declarations");
     scope()->VisitIllegalRedeclaration(this);
 
@@ skipping 1635 matching lines @@
         VisitForStackValue(property->obj());
         __ lw(LoadDescriptor::ReceiverRegister(), MemOperand(sp, 0));
       } else {
         VisitForStackValue(property->obj());
       }
       break;
     case NAMED_SUPER_PROPERTY:
       VisitForStackValue(
           property->obj()->AsSuperPropertyReference()->this_var());
       VisitForAccumulatorValue(
-          property->obj()->AsSuperPropertyReference()->home_object_var());
+          property->obj()->AsSuperPropertyReference()->home_object());
       __ Push(result_register());
       if (expr->is_compound()) {
         const Register scratch = a1;
         __ lw(scratch, MemOperand(sp, kPointerSize));
         __ Push(scratch, result_register());
       }
       break;
     case KEYED_SUPER_PROPERTY: {
       const Register scratch = a1;
       VisitForStackValue(
           property->obj()->AsSuperPropertyReference()->this_var());
       VisitForAccumulatorValue(
-          property->obj()->AsSuperPropertyReference()->home_object_var());
+          property->obj()->AsSuperPropertyReference()->home_object());
       __ Move(scratch, result_register());
       VisitForAccumulatorValue(property->key());
       __ Push(scratch, result_register());
       if (expr->is_compound()) {
         const Register scratch1 = t0;
         __ lw(scratch1, MemOperand(sp, 2 * kPointerSize));
         __ Push(scratch1, scratch, result_register());
       }
       break;
     }
@@ skipping 615 matching lines @@
       __ li(StoreDescriptor::NameRegister(),
             Operand(prop->key()->AsLiteral()->value()));
       if (FLAG_vector_stores) EmitLoadStoreICSlot(slot);
       CallStoreIC();
       break;
     }
     case NAMED_SUPER_PROPERTY: {
       __ Push(v0);
       VisitForStackValue(prop->obj()->AsSuperPropertyReference()->this_var());
       VisitForAccumulatorValue(
-          prop->obj()->AsSuperPropertyReference()->home_object_var());
+          prop->obj()->AsSuperPropertyReference()->home_object());
       // stack: value, this; v0: home_object
       Register scratch = a2;
       Register scratch2 = a3;
       __ mov(scratch, result_register());             // home_object
       __ lw(v0, MemOperand(sp, kPointerSize));        // value
       __ lw(scratch2, MemOperand(sp, 0));             // this
       __ sw(scratch2, MemOperand(sp, kPointerSize));  // this
       __ sw(scratch, MemOperand(sp, 0));              // home_object
       // stack: this, home_object; v0: value
       EmitNamedSuperPropertyStore(prop);
       break;
     }
     case KEYED_SUPER_PROPERTY: {
       __ Push(v0);
       VisitForStackValue(prop->obj()->AsSuperPropertyReference()->this_var());
       VisitForStackValue(
-          prop->obj()->AsSuperPropertyReference()->home_object_var());
+          prop->obj()->AsSuperPropertyReference()->home_object());
       VisitForAccumulatorValue(prop->key());
       Register scratch = a2;
       Register scratch2 = a3;
       __ lw(scratch2, MemOperand(sp, 2 * kPointerSize));  // value
       // stack: value, this, home_object; v0: key, a3: value
       __ lw(scratch, MemOperand(sp, kPointerSize));  // this
       __ sw(scratch, MemOperand(sp, 2 * kPointerSize));
       __ lw(scratch, MemOperand(sp, 0));  // home_object
       __ sw(scratch, MemOperand(sp, kPointerSize));
       __ sw(v0, MemOperand(sp, 0));
@@ skipping 210 matching lines @@
   Expression* key = expr->key();
 
   if (key->IsPropertyName()) {
     if (!expr->IsSuperAccess()) {
       VisitForAccumulatorValue(expr->obj());
       __ Move(LoadDescriptor::ReceiverRegister(), v0);
       EmitNamedPropertyLoad(expr);
     } else {
       VisitForStackValue(expr->obj()->AsSuperPropertyReference()->this_var());
       VisitForStackValue(
-          expr->obj()->AsSuperPropertyReference()->home_object_var());
+          expr->obj()->AsSuperPropertyReference()->home_object());
       EmitNamedSuperPropertyLoad(expr);
     }
   } else {
     if (!expr->IsSuperAccess()) {
       VisitForStackValue(expr->obj());
       VisitForAccumulatorValue(expr->key());
       __ Move(LoadDescriptor::NameRegister(), v0);
       __ pop(LoadDescriptor::ReceiverRegister());
       EmitKeyedPropertyLoad(expr);
     } else {
       VisitForStackValue(expr->obj()->AsSuperPropertyReference()->this_var());
       VisitForStackValue(
-          expr->obj()->AsSuperPropertyReference()->home_object_var());
+          expr->obj()->AsSuperPropertyReference()->home_object());
       VisitForStackValue(expr->key());
       EmitKeyedSuperPropertyLoad(expr);
     }
   }
   PrepareForBailoutForId(expr->LoadId(), TOS_REG);
   context()->Plug(v0);
 }
 
 
 void FullCodeGenerator::CallIC(Handle<Code> code,
@@ skipping 42 matching lines @@
   DCHECK(callee->IsProperty());
   Property* prop = callee->AsProperty();
   DCHECK(prop->IsSuperAccess());
 
   SetSourcePosition(prop->position());
   Literal* key = prop->key()->AsLiteral();
   DCHECK(!key->value()->IsSmi());
   // Load the function from the receiver.
   const Register scratch = a1;
   SuperPropertyReference* super_ref = prop->obj()->AsSuperPropertyReference();
-  VisitForAccumulatorValue(super_ref->home_object_var());
+  VisitForAccumulatorValue(super_ref->home_object());
   __ mov(scratch, v0);
   VisitForAccumulatorValue(super_ref->this_var());
   __ Push(scratch, v0, v0, scratch);
   __ Push(key->value());
 
   // Stack here:
   //  - home_object
   //  - this (receiver)
   //  - this (receiver) <-- LoadFromSuper will pop here and below.
   //  - home_object
@@ skipping 37 matching lines @@
 void FullCodeGenerator::EmitKeyedSuperCallWithLoadIC(Call* expr) {
   Expression* callee = expr->expression();
   DCHECK(callee->IsProperty());
   Property* prop = callee->AsProperty();
   DCHECK(prop->IsSuperAccess());
 
   SetSourcePosition(prop->position());
   // Load the function from the receiver.
   const Register scratch = a1;
   SuperPropertyReference* super_ref = prop->obj()->AsSuperPropertyReference();
-  VisitForAccumulatorValue(super_ref->home_object_var());
+  VisitForAccumulatorValue(super_ref->home_object());
   __ Move(scratch, v0);
   VisitForAccumulatorValue(super_ref->this_var());
   __ Push(scratch, v0, v0, scratch);
   VisitForStackValue(prop->key());
 
   // Stack here:
   //  - home_object
   //  - this (receiver)
   //  - this (receiver) <-- LoadKeyedFromSuper will pop here and below.
   //  - home_object
@@ skipping 1870 matching lines @@
         // Put the object both on the stack and in the register.
         VisitForStackValue(prop->obj());
         __ lw(LoadDescriptor::ReceiverRegister(), MemOperand(sp, 0));
         EmitNamedPropertyLoad(prop);
         break;
       }
 
       case NAMED_SUPER_PROPERTY: {
         VisitForStackValue(prop->obj()->AsSuperPropertyReference()->this_var());
         VisitForAccumulatorValue(
-            prop->obj()->AsSuperPropertyReference()->home_object_var());
+            prop->obj()->AsSuperPropertyReference()->home_object());
         __ Push(result_register());
         const Register scratch = a1;
         __ lw(scratch, MemOperand(sp, kPointerSize));
         __ Push(scratch, result_register());
         EmitNamedSuperPropertyLoad(prop);
         break;
       }
 
       case KEYED_SUPER_PROPERTY: {
         VisitForStackValue(prop->obj()->AsSuperPropertyReference()->this_var());
         VisitForAccumulatorValue(
-            prop->obj()->AsSuperPropertyReference()->home_object_var());
+            prop->obj()->AsSuperPropertyReference()->home_object());
         const Register scratch = a1;
         const Register scratch1 = t0;
         __ Move(scratch, result_register());
         VisitForAccumulatorValue(prop->key());
         __ Push(scratch, result_register());
         __ lw(scratch1, MemOperand(sp, 2 * kPointerSize));
         __ Push(scratch1, scratch, result_register());
         EmitKeyedSuperPropertyLoad(prop);
         break;
       }
@@ skipping 601 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS