Vector ICs: ObjectLiteral refactoring for Oracle feedback

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/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/compiler.h"
@@ skipping 1228 matching lines @@
     __ CallStub(&stub);
   } else {
     __ Push(info);
     __ CallRuntime(
         pretenure ? Runtime::kNewClosure_Tenured : Runtime::kNewClosure, 1);
   }
   context()->Plug(x0);
 }
 
 
-void FullCodeGenerator::EmitSetHomeObjectIfNeeded(Expression* initializer,
-                                                  int offset,
-                                                  FeedbackVectorICSlot slot) {
-  if (NeedsHomeObject(initializer)) {
-    __ Peek(StoreDescriptor::ReceiverRegister(), 0);
-    __ Mov(StoreDescriptor::NameRegister(),
-           Operand(isolate()->factory()->home_object_symbol()));
-    __ Peek(StoreDescriptor::ValueRegister(), offset * kPointerSize);
-    if (FLAG_vector_stores) EmitLoadStoreICSlot(slot);
-    CallStoreIC();
-  }
+void FullCodeGenerator::EmitSetHomeObject(Expression* initializer, int offset,
+                                          FeedbackVectorICSlot slot) {
+  DCHECK(NeedsHomeObject(initializer));
+  __ Peek(StoreDescriptor::ReceiverRegister(), 0);
+  __ Mov(StoreDescriptor::NameRegister(),
+         Operand(isolate()->factory()->home_object_symbol()));
+  __ Peek(StoreDescriptor::ValueRegister(), offset * kPointerSize);
+  if (FLAG_vector_stores) EmitLoadStoreICSlot(slot);
+  CallStoreIC();
 }
 
 
+void FullCodeGenerator::EmitSetHomeObjectAccumulator(
+    Expression* initializer, int offset, FeedbackVectorICSlot slot) {
+  DCHECK(NeedsHomeObject(initializer));
+  __ Move(StoreDescriptor::ReceiverRegister(), x0);
+  __ Mov(StoreDescriptor::NameRegister(),
+         Operand(isolate()->factory()->home_object_symbol()));
+  __ Peek(StoreDescriptor::ValueRegister(), offset * kPointerSize);
+  if (FLAG_vector_stores) EmitLoadStoreICSlot(slot);
+  CallStoreIC();
+}
+
+
 void FullCodeGenerator::EmitLoadGlobalCheckExtensions(VariableProxy* proxy,
                                                       TypeofMode typeof_mode,
                                                       Label* slow) {
   Register current = cp;
   Register next = x10;
   Register temp = x11;
 
   Scope* s = scope();
   while (s != NULL) {
     if (s->num_heap_slots() > 0) {
@@ skipping 238 matching lines @@
   __ Bind(&allocated);
   // After this, registers are used as follows:
   // x0: Newly allocated regexp.
   // x5: Materialized regexp.
   // x10, x11, x12: temps.
   __ CopyFields(x0, x5, CPURegList(x10, x11, x12), size / kPointerSize);
   context()->Plug(x0);
 }
 
 
-void FullCodeGenerator::EmitAccessor(Expression* expression) {
+void FullCodeGenerator::EmitAccessor(ObjectLiteralProperty* property) {
+  Expression* expression = (property == NULL) ? NULL : property->value();
   if (expression == NULL) {
     __ LoadRoot(x10, Heap::kNullValueRootIndex);
     __ Push(x10);
   } else {
     VisitForStackValue(expression);
+    if (NeedsHomeObject(expression)) {
+      DCHECK(property->kind() == ObjectLiteral::Property::GETTER ||
+             property->kind() == ObjectLiteral::Property::SETTER);
+      int offset = property->kind() == ObjectLiteral::Property::GETTER ? 2 : 3;
+      EmitSetHomeObject(expression, offset, property->GetSlot());
+    }
   }
 }
 
 
 void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
   Comment cmnt(masm_, "[ ObjectLiteral");
 
   Handle<FixedArray> constant_properties = expr->constant_properties();
   __ Ldr(x3, MemOperand(fp,  JavaScriptFrameConstants::kFunctionOffset));
   __ Ldr(x3, FieldMemOperand(x3, JSFunction::kLiteralsOffset));
   __ Mov(x2, Smi::FromInt(expr->literal_index()));
   __ Mov(x1, Operand(constant_properties));
   int flags = expr->ComputeFlags();
   __ Mov(x0, Smi::FromInt(flags));
   if (MustCreateObjectLiteralWithRuntime(expr)) {
     __ Push(x3, x2, x1, x0);
     __ CallRuntime(Runtime::kCreateObjectLiteral, 4);
   } else {
     FastCloneShallowObjectStub stub(isolate(), expr->properties_count());
     __ CallStub(&stub);
   }
   PrepareForBailoutForId(expr->CreateLiteralId(), TOS_REG);
 
   // If result_saved is true the result is on top of the stack.  If
   // result_saved is false the result is in x0.
   bool result_saved = false;
 
   AccessorTable accessor_table(zone());
   int property_index = 0;
-  // store_slot_index points to the vector IC slot for the next store IC used.
-  // ObjectLiteral::ComputeFeedbackRequirements controls the allocation of slots
-  // and must be updated if the number of store ICs emitted here changes.
-  int store_slot_index = 0;
   for (; property_index < expr->properties()->length(); property_index++) {
     ObjectLiteral::Property* property = expr->properties()->at(property_index);
     if (property->is_computed_name()) break;
     if (property->IsCompileTimeValue()) continue;
 
     Literal* key = property->key()->AsLiteral();
     Expression* value = property->value();
     if (!result_saved) {
       __ Push(x0);  // Save result on stack
       result_saved = true;
     }
     switch (property->kind()) {
       case ObjectLiteral::Property::CONSTANT:
         UNREACHABLE();
       case ObjectLiteral::Property::MATERIALIZED_LITERAL:
         DCHECK(!CompileTimeValue::IsCompileTimeValue(property->value()));
         // Fall through.
       case ObjectLiteral::Property::COMPUTED:
         // It is safe to use [[Put]] here because the boilerplate already
         // contains computed properties with an uninitialized value.
         if (key->value()->IsInternalizedString()) {
           if (property->emit_store()) {
             VisitForAccumulatorValue(value);
             DCHECK(StoreDescriptor::ValueRegister().is(x0));
             __ Mov(StoreDescriptor::NameRegister(), Operand(key->value()));
             __ Peek(StoreDescriptor::ReceiverRegister(), 0);
             if (FLAG_vector_stores) {
-              EmitLoadStoreICSlot(expr->GetNthSlot(store_slot_index++));
+              EmitLoadStoreICSlot(property->GetSlot(0));
               CallStoreIC();
             } else {
               CallStoreIC(key->LiteralFeedbackId());
             }
             PrepareForBailoutForId(key->id(), NO_REGISTERS);
 
             if (NeedsHomeObject(value)) {
-              __ Mov(StoreDescriptor::ReceiverRegister(), x0);
-              __ Mov(StoreDescriptor::NameRegister(),
-                     Operand(isolate()->factory()->home_object_symbol()));
-              __ Peek(StoreDescriptor::ValueRegister(), 0);
-              if (FLAG_vector_stores) {
-                EmitLoadStoreICSlot(expr->GetNthSlot(store_slot_index++));
-              }
-              CallStoreIC();
+              EmitSetHomeObjectAccumulator(value, 0, property->GetSlot(1));
             }
           } else {
             VisitForEffect(value);
           }
           break;
         }
         __ Peek(x0, 0);
         __ Push(x0);
         VisitForStackValue(key);
         VisitForStackValue(value);
         if (property->emit_store()) {
-          EmitSetHomeObjectIfNeeded(
-              value, 2, expr->SlotForHomeObject(value, &store_slot_index));
+          if (NeedsHomeObject(value)) {
+            EmitSetHomeObject(value, 2, property->GetSlot());
+          }
           __ Mov(x0, Smi::FromInt(SLOPPY));  // Language mode
           __ Push(x0);
           __ CallRuntime(Runtime::kSetProperty, 4);
         } else {
           __ Drop(3);
         }
         break;
       case ObjectLiteral::Property::PROTOTYPE:
         DCHECK(property->emit_store());
         // Duplicate receiver on stack.
         __ Peek(x0, 0);
         __ Push(x0);
         VisitForStackValue(value);
         __ CallRuntime(Runtime::kInternalSetPrototype, 2);
         break;
       case ObjectLiteral::Property::GETTER:
         if (property->emit_store()) {
-          accessor_table.lookup(key)->second->getter = value;
+          accessor_table.lookup(key)->second->getter = property;
         }
         break;
       case ObjectLiteral::Property::SETTER:
         if (property->emit_store()) {
-          accessor_table.lookup(key)->second->setter = value;
+          accessor_table.lookup(key)->second->setter = property;
         }
         break;
     }
   }
 
   // Emit code to define accessors, using only a single call to the runtime for
   // each pair of corresponding getters and setters.
   for (AccessorTable::Iterator it = accessor_table.begin();
        it != accessor_table.end();
        ++it) {
       __ Peek(x10, 0);  // Duplicate receiver.
       __ Push(x10);
       VisitForStackValue(it->first);
       EmitAccessor(it->second->getter);
-      EmitSetHomeObjectIfNeeded(
-          it->second->getter, 2,
-          expr->SlotForHomeObject(it->second->getter, &store_slot_index));
       EmitAccessor(it->second->setter);
-      EmitSetHomeObjectIfNeeded(
-          it->second->setter, 3,
-          expr->SlotForHomeObject(it->second->setter, &store_slot_index));
       __ Mov(x10, Smi::FromInt(NONE));
       __ Push(x10);
       __ CallRuntime(Runtime::kDefineAccessorPropertyUnchecked, 5);
   }
 
   // Object literals have two parts. The "static" part on the left contains no
   // computed property names, and so we can compute its map ahead of time; see
   // runtime.cc::CreateObjectLiteralBoilerplate. The second "dynamic" part
   // starts with the first computed property name, and continues with all
   // properties to its right.  All the code from above initializes the static
@@ skipping 14 matching lines @@
     __ Push(x10);
 
     if (property->kind() == ObjectLiteral::Property::PROTOTYPE) {
       DCHECK(!property->is_computed_name());
       VisitForStackValue(value);
       DCHECK(property->emit_store());
       __ CallRuntime(Runtime::kInternalSetPrototype, 2);
     } else {
       EmitPropertyKey(property, expr->GetIdForProperty(property_index));
       VisitForStackValue(value);
-      EmitSetHomeObjectIfNeeded(
-          value, 2, expr->SlotForHomeObject(value, &store_slot_index));
+      if (NeedsHomeObject(value)) {
+        EmitSetHomeObject(value, 2, property->GetSlot());
+      }
 
       switch (property->kind()) {
         case ObjectLiteral::Property::CONSTANT:
         case ObjectLiteral::Property::MATERIALIZED_LITERAL:
         case ObjectLiteral::Property::COMPUTED:
           if (property->emit_store()) {
             __ Mov(x0, Smi::FromInt(NONE));
             __ Push(x0);
             __ CallRuntime(Runtime::kDefineDataPropertyUnchecked, 4);
           } else {
@@ skipping 25 matching lines @@
     __ Peek(x0, 0);
     __ Push(x0);
     __ CallRuntime(Runtime::kToFastProperties, 1);
   }
 
   if (result_saved) {
     context()->PlugTOS();
   } else {
     context()->Plug(x0);
   }
-
-  // Verify that compilation exactly consumed the number of store ic slots that
-  // the ObjectLiteral node had to offer.
-  DCHECK(!FLAG_vector_stores || store_slot_index == expr->slot_count());
 }
 
 
 void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
   Comment cmnt(masm_, "[ ArrayLiteral");
 
   expr->BuildConstantElements(isolate());
   Handle<FixedArray> constant_elements = expr->constant_elements();
   bool has_fast_elements =
       IsFastObjectElementsKind(expr->constant_elements_kind());
@@ skipping 383 matching lines @@
   JumpPatchSite patch_site(masm_);    // Unbound, signals no inlined smi code.
   {
     Assembler::BlockPoolsScope scope(masm_);
     CallIC(code, expr->BinaryOperationFeedbackId());
     patch_site.EmitPatchInfo();
   }
   context()->Plug(x0);
 }
 
 
-void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit,
-                                                  int* used_store_slots) {
+void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
   // Constructor is in x0.
   DCHECK(lit != NULL);
   __ push(x0);
 
   // No access check is needed here since the constructor is created by the
   // class literal.
   Register scratch = x1;
   __ Ldr(scratch,
          FieldMemOperand(x0, JSFunction::kPrototypeOrInitialMapOffset));
   __ Push(scratch);
@@ skipping 13 matching lines @@
     // The static prototype property is read only. We handle the non computed
     // property name case in the parser. Since this is the only case where we
     // need to check for an own read only property we special case this so we do
     // not need to do this for every property.
     if (property->is_static() && property->is_computed_name()) {
       __ CallRuntime(Runtime::kThrowIfStaticPrototype, 1);
       __ Push(x0);
     }
 
     VisitForStackValue(value);
-    EmitSetHomeObjectIfNeeded(value, 2,
-                              lit->SlotForHomeObject(value, used_store_slots));
+    if (NeedsHomeObject(value)) {
+      EmitSetHomeObject(value, 2, property->GetSlot());
+    }
 
     switch (property->kind()) {
       case ObjectLiteral::Property::CONSTANT:
       case ObjectLiteral::Property::MATERIALIZED_LITERAL:
       case ObjectLiteral::Property::PROTOTYPE:
         UNREACHABLE();
       case ObjectLiteral::Property::COMPUTED:
         __ CallRuntime(Runtime::kDefineClassMethod, 3);
         break;
 
@@ skipping 3168 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64