Create per-descriptor-index LoadApiGetterStub

src/code-stubs.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/code-stubs.h"
 
 #include <sstream>
 
 #include "src/bootstrapper.h"
 #include "src/code-factory.h"
@@ skipping 3225 matching lines @@
 
   assembler->Bind(&if_equal);
   assembler->Return(assembler->BooleanConstant(mode == kDontNegateResult));
 
   assembler->Bind(&if_notequal);
   assembler->Return(assembler->BooleanConstant(mode == kNegateResult));
 }
 
 }  // namespace
 
+void LoadApiGetterStub::GenerateAssembly(
+    compiler::CodeStubAssembler* assembler) const {
+  typedef compiler::Node Node;
+  Node* context = assembler->Parameter(3);
+  Node* receiver = assembler->Parameter(0);
+  // For now we only support receiver_is_holder.
+  DCHECK(receiver_is_holder());
+  Node* holder = receiver;
+  Node* map = assembler->LoadMap(receiver);
+  Node* descriptors = assembler->LoadMapDescriptors(map);
+  Node* offset =
+      assembler->Int32Constant(DescriptorArray::ToValueIndex(index()));
+  Node* callback =
+      assembler->LoadFixedArrayElementInt32Index(descriptors, offset);
+  assembler->TailCallStub(CodeFactory::ApiGetter(isolate()), context, receiver,
+                          holder, callback);
+}
+
 void LessThanStub::GenerateAssembly(
     compiler::CodeStubAssembler* assembler) const {
   GenerateAbstractRelationalComparison(assembler, kLessThan);
 }
 
 void LessThanOrEqualStub::GenerateAssembly(
     compiler::CodeStubAssembler* assembler) const {
   GenerateAbstractRelationalComparison(assembler, kLessThanOrEqual);
 }
 
@@ skipping 866 matching lines @@
   if (type->Is(Type::UntaggedPointer())) {
     return Representation::External();
   }
 
   DCHECK(!type->Is(Type::Untagged()));
   return Representation::Tagged();
 }
 
 }  // namespace internal
 }  // namespace v8