Cache number of type arguments in class object instead of recalculating it.

runtime/vm/stub_code_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 1068 matching lines @@
 // Called for inline allocation of objects.
 // Input parameters:
 //   RSP + 16 : type arguments object (only if class is parameterized).
 //   RSP + 8 : type arguments of instantiator (only if class is parameterized).
 //   RSP : points to return address.
 void StubCode::GenerateAllocationStubForClass(Assembler* assembler,
                                               const Class& cls) {
   const intptr_t kObjectTypeArgumentsOffset = 2 * kWordSize;
   const intptr_t kInstantiatorTypeArgumentsOffset = 1 * kWordSize;
   // The generated code is different if the class is parameterized.
-  const bool is_cls_parameterized = cls.HasTypeArguments();
-  ASSERT(!cls.HasTypeArguments() ||
+  const bool is_cls_parameterized = cls.NumTypeArguments() > 0;
+  ASSERT(!is_cls_parameterized ||
          (cls.type_arguments_field_offset() != Class::kNoTypeArguments));
   // kInlineInstanceSize is a constant used as a threshold for determining
   // when the object initialization should be done as a loop or as
   // straight line code.
   const int kInlineInstanceSize = 12;  // In words.
   const intptr_t instance_size = cls.instance_size();
   ASSERT(instance_size > 0);
   const intptr_t type_args_size = InstantiatedTypeArguments::InstanceSize();
   __ LoadObject(R12, Object::null_object(), PP);
   if (FLAG_inline_alloc &&
@@ skipping 152 matching lines @@
 //   RSP + 16 : receiver (null if not an implicit instance closure).
 //   RSP + 8 : type arguments object (null if class is not parameterized).
 //   RSP : points to return address.
 void StubCode::GenerateAllocationStubForClosure(Assembler* assembler,
                                                 const Function& func) {
   ASSERT(func.IsClosureFunction());
   ASSERT(!func.IsImplicitStaticClosureFunction());
   const bool is_implicit_instance_closure =
       func.IsImplicitInstanceClosureFunction();
   const Class& cls = Class::ZoneHandle(func.signature_class());
-  const bool has_type_arguments = cls.HasTypeArguments();
+  const bool has_type_arguments = cls.NumTypeArguments() > 0;
 
   __ EnterStubFrameWithPP();  // Uses pool pointer to refer to function.
   __ LoadObject(R12, Object::null_object(), PP);
   const intptr_t kTypeArgumentsOffset = 4 * kWordSize;
   const intptr_t kReceiverOffset = 5 * kWordSize;
   const intptr_t closure_size = Closure::InstanceSize();
   const intptr_t context_size = Context::InstanceSize(1);  // Captured receiver.
   if (FLAG_inline_alloc &&
       Heap::IsAllocatableInNewSpace(closure_size + context_size)) {
     Label slow_case;
@@ skipping 860 matching lines @@
   __ movq(right, Address(RSP, 3 * kWordSize));
   GenerateIdenticalWithNumberCheckStub(assembler, left, right);
   __ popq(right);
   __ popq(left);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64