Fix resolution and canonicalization of typedefs and function types in

runtime/vm/object_service.cc

 // Copyright (c) 2016, 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/debugger.h"
 #include "vm/disassembler.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
@@ skipping 225 matching lines @@
 
 
 void PatchClass::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Object::PrintJSONImpl(stream, ref);
 }
 
 
 static void AddFunctionServiceId(const JSONObject& jsobj,
                                  const Function& f,
                                  const Class& cls) {
+  if (cls.IsNull()) {
+    ASSERT(f.IsSignatureFunction());
+    jsobj.AddServiceId(f);
+    return;
+  }
   // Special kinds of functions use indices in their respective lists.
   intptr_t id = -1;
   const char* selector = NULL;
   if (f.IsNonImplicitClosureFunction()) {
     id = Isolate::Current()->FindClosureIndex(f);
     selector = "closures";
   } else if (f.IsImplicitClosureFunction()) {
     id = cls.FindImplicitClosureFunctionIndex(f);
     selector = "implicit_closures";
   } else if (f.IsNoSuchMethodDispatcher() || f.IsInvokeFieldDispatcher()) {
@@ skipping 16 matching lines @@
   }
   // Oddball functions (not known to their owner) fall back to use the object
   // id ring. Current known examples are signature functions of closures
   // and stubs like 'megamorphic_miss'.
   jsobj.AddServiceId(f);
 }
 
 
 void Function::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Class& cls = Class::Handle(Owner());
-  ASSERT(!cls.IsNull());
-  Error& err = Error::Handle();
-  err ^= cls.EnsureIsFinalized(Thread::Current());
-  ASSERT(err.IsNull());
+  if (!cls.IsNull()) {
+    Error& err = Error::Handle();
+    err ^= cls.EnsureIsFinalized(Thread::Current());
+    ASSERT(err.IsNull());
+  } else {
+    ASSERT(IsSignatureFunction());
+  }
   JSONObject jsobj(stream);
   AddCommonObjectProperties(&jsobj, "Function", ref);
   AddFunctionServiceId(jsobj, *this, cls);
   const String& user_name = String::Handle(UserVisibleName());
   const String& vm_name = String::Handle(name());
   AddNameProperties(&jsobj, user_name.ToCString(), vm_name.ToCString());
   const Function& parent = Function::Handle(parent_function());
   if (!parent.IsNull()) {
     jsobj.AddProperty("owner", parent);
-  } else if (cls.IsTopLevel()) {
-    const Library& library = Library::Handle(cls.library());
-    jsobj.AddProperty("owner", library);
-  } else {
-    jsobj.AddProperty("owner", cls);
+  } else if (!cls.IsNull()) {
+    if (cls.IsTopLevel()) {
+      const Library& library = Library::Handle(cls.library());
+      jsobj.AddProperty("owner", library);
+    } else {
+      jsobj.AddProperty("owner", cls);
+    }
   }
 
   const char* kind_string = Function::KindToCString(kind());
   jsobj.AddProperty("_kind", kind_string);
   jsobj.AddProperty("static", is_static());
   jsobj.AddProperty("const", is_const());
   jsobj.AddProperty("_intrinsic", is_intrinsic());
   jsobj.AddProperty("_native", is_native());
   if (ref) {
     return;
@@ skipping 782 matching lines @@
   }
 }
 
 
 void AbstractType::PrintJSONImpl(JSONStream* stream, bool ref) const {
   UNREACHABLE();
 }
 
 
 void Type::PrintJSONImpl(JSONStream* stream, bool ref) const {
+  // TODO(regis): Function types are not handled properly.
   JSONObject jsobj(stream);
   PrintSharedInstanceJSON(&jsobj, ref);
   jsobj.AddProperty("kind", "Type");
   if (HasResolvedTypeClass()) {
     const Class& type_cls = Class::Handle(type_class());
     if (type_cls.CanonicalType() == raw()) {
       intptr_t cid = type_cls.id();
       jsobj.AddFixedServiceId("classes/%" Pd "/types/%d", cid, 0);
     } else {
       jsobj.AddServiceId(*this);
@@ skipping 467 matching lines @@
   jsobj.AddProperty("mirrorReferent", referent_handle);
 }
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 #endif
 
 }  // namespace dart