Check for a passed-in type argument vector in the prolog of generic functions.

runtime/vm/object.cc

 // Copyright (c) 2012, 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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/become.h"
@@ skipping 2655 matching lines @@
   Function& invocation = Function::Handle(
       zone, Function::New(
                 String::Handle(zone, Symbols::New(thread, target_name)), kind,
                 false,  // Not static.
                 false,  // Not const.
                 false,  // Not abstract.
                 false,  // Not external.
                 false,  // Not native.
                 *this, TokenPosition::kMinSource));
   ArgumentsDescriptor desc(args_desc);
+  if (desc.TypeArgsLen() > 0) {
+    // Make dispatcher function generic, since type arguments are passed.
+    const TypeArguments& type_params =
+        TypeArguments::Handle(zone, TypeArguments::New(desc.TypeArgsLen()));
+    // TODO(regis): Can we leave the array uninitialized to save memory?
+    invocation.set_type_parameters(type_params);
+  }
+
   invocation.set_num_fixed_parameters(desc.PositionalCount());
   invocation.SetNumOptionalParameters(desc.NamedCount(),
                                       false);  // Not positional.
   invocation.set_parameter_types(
       Array::Handle(zone, Array::New(desc.Count(), Heap::kOld)));
   invocation.set_parameter_names(
       Array::Handle(zone, Array::New(desc.Count(), Heap::kOld)));
   // Receiver.
   invocation.SetParameterTypeAt(0, Object::dynamic_type());
   invocation.SetParameterNameAt(0, Symbols::This());
@@ skipping 2142 matching lines @@
 }
 
 
 void TypeArguments::SetTypeAt(intptr_t index, const AbstractType& value) const {
   ASSERT(!IsCanonical());
   StorePointer(TypeAddr(index), value.raw());
 }
 
 
 bool TypeArguments::IsResolved() const {
+  if (IsCanonical()) {
+    return true;
+  }
   AbstractType& type = AbstractType::Handle();
   const intptr_t num_types = Length();
   for (intptr_t i = 0; i < num_types; i++) {
     type = TypeAt(i);
     if (!type.IsResolved()) {
       return false;
     }
   }
   return true;
 }
@@ skipping 8202 matching lines @@
 void ICData::ResetSwitchable(Zone* zone) const {
   ASSERT(NumArgsTested() == 1);
   set_ic_data_array(Array::Handle(zone, CachedEmptyICDataArray(1)));
 }
 
 
 const char* ICData::ToCString() const {
   const String& name = String::Handle(target_name());
   const intptr_t num_args = NumArgsTested();
   const intptr_t num_checks = NumberOfChecks();
+  const intptr_t type_args_len = TypeArgsLen();
   return OS::SCreate(Thread::Current()->zone(),
-                     "ICData target:'%s' num-args: %" Pd " num-checks: %" Pd "",
-                     name.ToCString(), num_args, num_checks);
+                     "ICData target:'%s' num-args: %" Pd " num-checks: %" Pd
+                     " "
+                     "type-args-len: %" Pd "",
+                     name.ToCString(), num_args, num_checks, type_args_len);
 }
 
 
 RawFunction* ICData::Owner() const {
   Object& obj = Object::Handle(raw_ptr()->owner_);
   if (obj.IsNull()) {
     ASSERT(Dart::vm_snapshot_kind() == Snapshot::kFullAOT);
     return Function::null();
   } else if (obj.IsFunction()) {
     return Function::Cast(obj).raw();
@@ skipping 62 matching lines @@
 void ICData::set_tag(intptr_t value) const {
   StoreNonPointer(&raw_ptr()->tag_, value);
 }
 #endif
 
 intptr_t ICData::NumArgsTested() const {
   return NumArgsTestedBits::decode(raw_ptr()->state_bits_);
 }
 
 
+intptr_t ICData::TypeArgsLen() const {
+  ArgumentsDescriptor args_desc(Array::Handle(arguments_descriptor()));
+  return args_desc.TypeArgsLen();
+}
+
+
 void ICData::SetNumArgsTested(intptr_t value) const {
   ASSERT(Utils::IsUint(2, value));
   StoreNonPointer(&raw_ptr()->state_bits_,
                   NumArgsTestedBits::update(value, raw_ptr()->state_bits_));
 }
 
 
 uint32_t ICData::DeoptReasons() const {
   return DeoptReasonBits::decode(raw_ptr()->state_bits_);
 }
@@ skipping 1519 matching lines @@
   return Thread::Current()->zone()->PrintToString("Code(%s)", QualifiedName());
 }
 
 
 const char* Code::Name() const {
   Zone* zone = Thread::Current()->zone();
   const Object& obj = Object::Handle(zone, owner());
   if (obj.IsNull()) {
     // Regular stub.
     const char* name = StubCode::NameOfStub(UncheckedEntryPoint());
-    ASSERT(name != NULL);
+    if (name == NULL) {
+      return zone->PrintToString("[this stub]");  // Not yet recorded.

[rmacnak, 2017/06/14 00:14:20]

ASSERT stub code not initialized? I think there's already a way to check that's
used by the profiler.

[regis, 2017/06/14 21:02:04]

I found this in the profiler:
StubCode::HasBeenInitialized()
I suppose that is what you mean. I'll try.

+    }
     return zone->PrintToString("[Stub] %s", name);
   } else if (obj.IsClass()) {
     // Allocation stub.
     String& cls_name = String::Handle(zone, Class::Cast(obj).ScrubbedName());
     ASSERT(!cls_name.IsNull());
     return zone->PrintToString("[Stub] Allocate %s", cls_name.ToCString());
   } else {
     ASSERT(obj.IsFunction());
     // Dart function.
     const char* opt = is_optimized() ? "*" : "";
@@ skipping 1263 matching lines @@
   const bool other_is_dart_function = instantiated_other.IsDartFunctionType();
   if (other_is_dart_function || instantiated_other.IsFunctionType()) {
     // Check if this instance understands a call() method of a compatible type.
     Function& sig_fun =
         Function::Handle(zone, cls.LookupCallFunctionForTypeTest());
     if (!sig_fun.IsNull()) {
       if (other_is_dart_function) {
         return true;
       }
       if (!sig_fun.HasInstantiatedSignature()) {
+        // The following signature instantiation of sig_fun with its own type
+        // parameters only works if sig_fun has no generic parent, which is
+        // guaranteed to be the case, since the looked up call() function
+        // cannot be nested. It is most probably not even generic.
+        ASSERT(!sig_fun.HasGenericParent());
         const TypeArguments& function_type_arguments =
             TypeArguments::Handle(zone, sig_fun.type_parameters());
         // No bound error possible, since the instance exists.
         sig_fun = sig_fun.InstantiateSignatureFrom(
             type_arguments, function_type_arguments, Heap::kOld);
       }
       const Function& other_signature =
           Function::Handle(zone, Type::Cast(instantiated_other).signature());
       if (sig_fun.IsSubtypeOf(other_signature, bound_error, NULL, Heap::kOld)) {
         return true;
@@ skipping 7398 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart