Implement eager instantiation and canonicalization of type arguments at run

runtime/vm/flow_graph_compiler_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"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 233 matching lines @@
   ASSERT(smi_is_ok || malformed_error.IsNull());
   __ testq(kInstanceReg, Immediate(kSmiTagMask));
   if (smi_is_ok) {
     __ j(ZERO, is_instance_lbl);
   } else {
     __ j(ZERO, is_not_instance_lbl);
   }
   const intptr_t num_type_args = type_class.NumTypeArguments();
   const intptr_t num_type_params = type_class.NumTypeParameters();
   const intptr_t from_index = num_type_args - num_type_params;
-  const AbstractTypeArguments& type_arguments =
-      AbstractTypeArguments::ZoneHandle(type.arguments());
+  const TypeArguments& type_arguments =
+      TypeArguments::ZoneHandle(type.arguments());
   const bool is_raw_type = type_arguments.IsNull() ||
       type_arguments.IsRaw(from_index, num_type_params);
   // Signature class is an instantiated parameterized type.
   if (!type_class.IsSignatureClass()) {
     if (is_raw_type) {
       const Register kClassIdReg = R10;
       // dynamic type argument, check only classes.
       __ LoadClassId(kClassIdReg, kInstanceReg);
       __ cmpl(kClassIdReg, Immediate(type_class.id()));
       __ j(EQUAL, is_instance_lbl);
@@ skipping 151 matching lines @@
     Label* is_instance_lbl,
     Label* is_not_instance_lbl) {
   __ Comment("UninstantiatedTypeTest");
   ASSERT(!type.IsInstantiated());
   // Skip check if destination is a dynamic type.
   if (type.IsTypeParameter()) {
     const TypeParameter& type_param = TypeParameter::Cast(type);
     // Load instantiator (or null) and instantiator type arguments on stack.
     __ movq(RDX, Address(RSP, 0));  // Get instantiator type arguments.
     // RDX: instantiator type arguments.
-    // Check if type argument is dynamic.
+    // Check if type arguments are null, i.e. equivalent to vector of dynamic.
     __ CompareObject(RDX, Object::null_object(), PP);
     __ j(EQUAL, is_instance_lbl);
-    // Can handle only type arguments that are instances of TypeArguments.
-    // (runtime checks canonicalize type arguments).
-    Label fall_through;
-    __ CompareClassId(RDX, kTypeArgumentsCid);
-    __ j(NOT_EQUAL, &fall_through);
     __ movq(RDI,
         FieldAddress(RDX, TypeArguments::type_at_offset(type_param.index())));
     // RDI: Concrete type of type.
     // Check if type argument is dynamic.
     __ CompareObject(RDI, Type::ZoneHandle(Type::DynamicType()), PP);
     __ j(EQUAL,  is_instance_lbl);
-    __ CompareObject(RDI, Object::null_object(), PP);
-    __ j(EQUAL,  is_instance_lbl);
     const Type& object_type = Type::ZoneHandle(Type::ObjectType());
     __ CompareObject(RDI, object_type, PP);
     __ j(EQUAL,  is_instance_lbl);
 
     // For Smi check quickly against int and num interfaces.
     Label not_smi;
     __ testq(RAX, Immediate(kSmiTagMask));  // Value is Smi?
     __ j(NOT_ZERO, &not_smi, Assembler::kNearJump);
     __ CompareObject(RDI, Type::ZoneHandle(Type::IntType()), PP);
     __ j(EQUAL,  is_instance_lbl);
     __ CompareObject(RDI, Type::ZoneHandle(Type::Number()), PP);
     __ j(EQUAL,  is_instance_lbl);
     // Smi must be handled in runtime.
+    Label fall_through;
     __ jmp(&fall_through);
 
     __ Bind(&not_smi);
     // RDX: instantiator type arguments.
     // RAX: instance.
     const Register kInstanceReg = RAX;
     const Register kTypeArgumentsReg = RDX;
     const Register kTempReg = R10;
     const SubtypeTestCache& type_test_cache =
         SubtypeTestCache::ZoneHandle(
@@ skipping 1392 matching lines @@
   __ movups(reg, Address(RSP, 0));
   __ AddImmediate(RSP, Immediate(kFpuRegisterSize), PP);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64