Introduce FieldIndex to unify and abstract property/field offset

src/arm64/stub-cache-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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/ic-inl.h"
 #include "src/codegen.h"
@@ skipping 504 matching lines @@
                                            Register scratch1,
                                            Register scratch2,
                                            Label* miss_label) {
   // x0 : value
   Label exit;
 
   // Stub never generated for non-global objects that require access
   // checks.
   ASSERT(object->IsJSGlobalProxy() || !object->IsAccessCheckNeeded());
 
-  int index = lookup->GetFieldIndex().field_index();
-
-  // Adjust for the number of properties stored in the object. Even in the
-  // face of a transition we can use the old map here because the size of the
-  // object and the number of in-object properties is not going to change.
-  index -= object->map()->inobject_properties();
+  FieldIndex index = lookup->GetFieldIndex();
 
   Representation representation = lookup->representation();
   ASSERT(!representation.IsNone());
   if (representation.IsSmi()) {
     __ JumpIfNotSmi(value_reg, miss_label);
   } else if (representation.IsHeapObject()) {
     __ JumpIfSmi(value_reg, miss_label);
     HeapType* field_type = lookup->GetFieldType();
     HeapType::Iterator<Map> it = field_type->Classes();
     if (!it.Done()) {
@@ skipping 10 matching lines @@
       }
       __ Bind(&do_store);
     }
   } else if (representation.IsDouble()) {
     UseScratchRegisterScope temps(masm);
     DoubleRegister temp_double = temps.AcquireD();
 
     __ SmiUntagToDouble(temp_double, value_reg, kSpeculativeUntag);
 
     // Load the double storage.
-    if (index < 0) {
-      int offset = (index * kPointerSize) + object->map()->instance_size();
-      __ Ldr(scratch1, FieldMemOperand(receiver_reg, offset));
+    if (index.is_inobject()) {
+      __ Ldr(scratch1, FieldMemOperand(receiver_reg, index.offset()));
     } else {
-      int offset = (index * kPointerSize) + FixedArray::kHeaderSize;
       __ Ldr(scratch1,
              FieldMemOperand(receiver_reg, JSObject::kPropertiesOffset));
-      __ Ldr(scratch1, FieldMemOperand(scratch1, offset));
+      __ Ldr(scratch1, FieldMemOperand(scratch1, index.offset()));
     }
 
     // Store the value into the storage.
     Label do_store, heap_number;
 
     __ JumpIfSmi(value_reg, &do_store);
 
     __ CheckMap(value_reg, scratch2, Heap::kHeapNumberMapRootIndex,
                 miss_label, DONT_DO_SMI_CHECK);
     __ Ldr(temp_double, FieldMemOperand(value_reg, HeapNumber::kValueOffset));
 
     __ Bind(&do_store);
     __ Str(temp_double, FieldMemOperand(scratch1, HeapNumber::kValueOffset));
 
     // Return the value (register x0).
     ASSERT(value_reg.is(x0));
     __ Ret();
     return;
   }
 
   // TODO(verwaest): Share this code as a code stub.
   SmiCheck smi_check = representation.IsTagged()
       ? INLINE_SMI_CHECK : OMIT_SMI_CHECK;
-  if (index < 0) {
+  if (index.is_inobject()) {
     // Set the property straight into the object.
-    int offset = object->map()->instance_size() + (index * kPointerSize);
-    __ Str(value_reg, FieldMemOperand(receiver_reg, offset));
+    __ Str(value_reg, FieldMemOperand(receiver_reg, index.offset()));
 
     if (!representation.IsSmi()) {
       // Skip updating write barrier if storing a smi.
       __ JumpIfSmi(value_reg, &exit);
 
       // Update the write barrier for the array address.
       // Pass the now unused name_reg as a scratch register.
       __ Mov(name_reg, value_reg);
       __ RecordWriteField(receiver_reg,
-                          offset,
+                          index.offset(),
                           name_reg,
                           scratch1,
                           kLRHasNotBeenSaved,
                           kDontSaveFPRegs,
                           EMIT_REMEMBERED_SET,
                           smi_check);
     }
   } else {
     // Write to the properties array.
-    int offset = index * kPointerSize + FixedArray::kHeaderSize;
     // Get the properties array
     __ Ldr(scratch1,
            FieldMemOperand(receiver_reg, JSObject::kPropertiesOffset));
-    __ Str(value_reg, FieldMemOperand(scratch1, offset));
+    __ Str(value_reg, FieldMemOperand(scratch1, index.offset()));
 
     if (!representation.IsSmi()) {
       // Skip updating write barrier if storing a smi.
       __ JumpIfSmi(value_reg, &exit);
 
       // Update the write barrier for the array address.
       // Ok to clobber receiver_reg and name_reg, since we return.
       __ Mov(name_reg, value_reg);
       __ RecordWriteField(scratch1,
-                          offset,
+                          index.offset(),
                           name_reg,
                           receiver_reg,
                           kLRHasNotBeenSaved,
                           kDontSaveFPRegs,
                           EMIT_REMEMBERED_SET,
                           smi_check);
     }
   }
 
   __ Bind(&exit);
@@ skipping 320 matching lines @@
     __ B(ne, &miss);
   }
 
   HandlerFrontendFooter(name, &miss);
   return reg;
 }
 
 
 void LoadStubCompiler::GenerateLoadField(Register reg,
                                          Handle<JSObject> holder,
-                                         PropertyIndex field,
+                                         FieldIndex field,
                                          Representation representation) {
   __ Mov(receiver(), reg);
   if (kind() == Code::LOAD_IC) {
-    LoadFieldStub stub(isolate(),
-                       field.is_inobject(holder),
-                       field.translate(holder),
-                       representation);
+    LoadFieldStub stub(isolate(), field);
     GenerateTailCall(masm(), stub.GetCode());
   } else {
-    KeyedLoadFieldStub stub(isolate(),
-                            field.is_inobject(holder),
-                            field.translate(holder),
-                            representation);
+    KeyedLoadFieldStub stub(isolate(), field);
     GenerateTailCall(masm(), stub.GetCode());
   }
 }
 
 
 void LoadStubCompiler::GenerateLoadConstant(Handle<Object> value) {
   // Return the constant value.
   __ LoadObject(x0, value);
   __ Ret();
 }
@@ skipping 489 matching lines @@
 
   // Miss case, call the runtime.
   __ Bind(&miss);
   TailCallBuiltin(masm, Builtins::kKeyedLoadIC_Miss);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64