Remove signature classes from the VM.

runtime/vm/flow_graph_compiler_mips.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_MIPS.
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 247 matching lines @@
 // Clobbers T0.
 RawSubtypeTestCache*
 FlowGraphCompiler::GenerateInstantiatedTypeWithArgumentsTest(
     intptr_t token_pos,
     const AbstractType& type,
     Label* is_instance_lbl,
     Label* is_not_instance_lbl) {
   __ Comment("InstantiatedTypeWithArgumentsTest");
   ASSERT(type.IsInstantiated());
   const Class& type_class = Class::ZoneHandle(zone(), type.type_class());
-  ASSERT((type_class.NumTypeArguments() > 0) || type_class.IsSignatureClass());
+  ASSERT(type.IsFunctionType() || (type_class.NumTypeArguments() > 0));
   const Register kInstanceReg = A0;
   Error& bound_error = Error::Handle(zone());
   const Type& int_type = Type::Handle(zone(), Type::IntType());
   const bool smi_is_ok = int_type.IsSubtypeOf(type, &bound_error, Heap::kOld);
   // Malformed type should have been handled at graph construction time.
   ASSERT(smi_is_ok || bound_error.IsNull());
   __ andi(CMPRES1, kInstanceReg, Immediate(kSmiTagMask));
   if (smi_is_ok) {
     __ beq(CMPRES1, ZR, is_instance_lbl);
   } else {
     __ beq(CMPRES1, ZR, 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 TypeArguments& type_arguments =
-      TypeArguments::ZoneHandle(zone(), 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()) {
+  // A function type test requires checking the function signature.
+  if (!type.IsFunctionType()) {
+    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 TypeArguments& type_arguments =
+        TypeArguments::ZoneHandle(zone(), type.arguments());
+    const bool is_raw_type = type_arguments.IsNull() ||
+        type_arguments.IsRaw(from_index, num_type_params);
     if (is_raw_type) {
       const Register kClassIdReg = T0;
       // dynamic type argument, check only classes.
       __ LoadClassId(kClassIdReg, kInstanceReg);
       __ BranchEqual(kClassIdReg, Immediate(type_class.id()), is_instance_lbl);
       // List is a very common case.
       if (IsListClass(type_class)) {
         GenerateListTypeCheck(kClassIdReg, is_instance_lbl);
       }
       return GenerateSubtype1TestCacheLookup(
@@ skipping 46 matching lines @@
 // A0: instance being type checked (preserved).
 // Clobbers: T0, T1, T2
 // Returns true if there is a fallthrough.
 bool FlowGraphCompiler::GenerateInstantiatedTypeNoArgumentsTest(
     intptr_t token_pos,
     const AbstractType& type,
     Label* is_instance_lbl,
     Label* is_not_instance_lbl) {
   __ Comment("InstantiatedTypeNoArgumentsTest");
   ASSERT(type.IsInstantiated());
+  if (type.IsFunctionType()) {
+    // Fallthrough.
+    return true;
+  }
   const Class& type_class = Class::Handle(zone(), type.type_class());
   ASSERT(type_class.NumTypeArguments() == 0);
 
   const Register kInstanceReg = A0;
   __ andi(T0, A0, Immediate(kSmiTagMask));
   // If instance is Smi, check directly.
   const Class& smi_class = Class::Handle(zone(), Smi::Class());
   if (smi_class.IsSubtypeOf(TypeArguments::Handle(zone()),
                             type_class,
                             TypeArguments::Handle(zone()),
                             NULL,
                             Heap::kOld)) {
     __ beq(T0, ZR, is_instance_lbl);
   } else {
     __ beq(T0, ZR, is_not_instance_lbl);
   }
   // Compare if the classes are equal.
   const Register kClassIdReg = T0;
   __ LoadClassId(kClassIdReg, kInstanceReg);
   __ BranchEqual(kClassIdReg, Immediate(type_class.id()), is_instance_lbl);
 
   // See ClassFinalizer::ResolveSuperTypeAndInterfaces for list of restricted
   // interfaces.
   // Bool interface can be implemented only by core class Bool.
   if (type.IsBoolType()) {
     __ BranchEqual(kClassIdReg, Immediate(kBoolCid), is_instance_lbl);
     __ b(is_not_instance_lbl);
     return false;
   }
-  if (type.IsFunctionType()) {
+  if (type.IsDartFunctionType()) {
     // Check if instance is a closure.
-    __ LoadClassById(T1, kClassIdReg);
-    __ lw(T1, FieldAddress(T1, Class::signature_function_offset()));
-    __ BranchNotEqual(T1, Object::null_object(), is_instance_lbl);
+    __ BranchEqual(kClassIdReg, Immediate(kClosureCid), is_instance_lbl);
   }
   // Custom checking for numbers (Smi, Mint, Bigint and Double).
   // Note that instance is not Smi (checked above).
   if (type.IsSubtypeOf(
           Type::Handle(zone(), Type::Number()), NULL, Heap::kOld)) {
     GenerateNumberTypeCheck(
         kClassIdReg, type, is_instance_lbl, is_not_instance_lbl);
     return false;
   }
   if (type.IsStringType()) {
@@ skipping 128 matching lines @@
     Label* is_instance_lbl,
     Label* is_not_instance_lbl) {
   __ Comment("InlineInstanceof");
   if (type.IsVoidType()) {
     // A non-null value is returned from a void function, which will result in a
     // type error. A null value is handled prior to executing this inline code.
     return SubtypeTestCache::null();
   }
   if (type.IsInstantiated()) {
     const Class& type_class = Class::ZoneHandle(zone(), type.type_class());
-    // A class equality check is only applicable with a dst type of a
-    // non-parameterized class, non-signature class, or with a raw dst type of
+    // A class equality check is only applicable with a dst type (not a
+    // function type) of a non-parameterized class or with a raw dst type of
     // a parameterized class.
-    if (type_class.IsSignatureClass() || (type_class.NumTypeArguments() > 0)) {
+    if (type.IsFunctionType() || (type_class.NumTypeArguments() > 0)) {
       return GenerateInstantiatedTypeWithArgumentsTest(token_pos,
                                                        type,
                                                        is_instance_lbl,
                                                        is_not_instance_lbl);
       // Fall through to runtime call.
     }
     const bool has_fall_through =
         GenerateInstantiatedTypeNoArgumentsTest(token_pos,
                                                 type,
                                                 is_instance_lbl,
@@ skipping 1344 matching lines @@
   __ AddImmediate(SP, kDoubleSize);
 }
 
 
 #undef __
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS