Change trail from GrowableObjectArray to ZoneGrowableArray.

runtime/vm/object.h

 // 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.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 1509 matching lines @@
   void set_ident(const String& ident) const;
   void set_token_pos(intptr_t token_pos) const;
 
   static RawUnresolvedClass* New();
 
   FINAL_HEAP_OBJECT_IMPLEMENTATION(UnresolvedClass, Object);
   friend class Class;
 };
 
 
+// TODO(srdjan): Ideally this should be 'const AbstractType*'.

[regis, 2015/08/27 16:24:53]

Looks pretty ideal to me.

[srdjan, 2015/08/27 16:36:19]

It's Puuurrrfect ... thus removed.

+typedef ZoneGrowableArray<const AbstractType*> Trail;
+typedef ZoneGrowableArray<const AbstractType*>* TrailPtr;
+
 // A TypeArguments is an array of AbstractType.
 class TypeArguments : public Object {
  public:
   intptr_t Length() const;
   RawAbstractType* TypeAt(intptr_t index) const;
   static intptr_t type_at_offset(intptr_t index) {
     return OFFSET_OF_RETURNED_VALUE(
         RawTypeArguments, types) + index * kWordSize;
   }
   void SetTypeAt(intptr_t index, const AbstractType& value) const;
@@ skipping 45 matching lines @@
                           intptr_t len,
                           Error* bound_error) const {
     return TypeTest(kIsMoreSpecificThan, other, from_index, len, bound_error);
   }
 
   // Check if the vectors are equal (they may be null).
   bool Equals(const TypeArguments& other) const {
     return IsSubvectorEquivalent(other, 0, IsNull() ? 0 : Length());
   }
 
-  bool IsEquivalent(const TypeArguments& other,
-                    GrowableObjectArray* trail = NULL) const {
+  bool IsEquivalent(const TypeArguments& other, TrailPtr trail = NULL) const {
     return IsSubvectorEquivalent(other, 0, IsNull() ? 0 : Length(), trail);
   }
   bool IsSubvectorEquivalent(const TypeArguments& other,
                              intptr_t from_index,
                              intptr_t len,
-                             GrowableObjectArray* trail = NULL) const;
+                             TrailPtr trail = NULL) const;
 
   // Check if the vector is instantiated (it must not be null).
-  bool IsInstantiated(GrowableObjectArray* trail = NULL) const {
+  bool IsInstantiated(TrailPtr trail = NULL) const {
     return IsSubvectorInstantiated(0, Length(), trail);
   }
   bool IsSubvectorInstantiated(intptr_t from_index,
                                intptr_t len,
-                               GrowableObjectArray* trail = NULL) const;
+                               TrailPtr trail = NULL) const;
   bool IsUninstantiatedIdentity() const;
   bool CanShareInstantiatorTypeArguments(const Class& instantiator_class) const;
 
   // Return true if all types of this vector are respectively, resolved,
   // finalized, or bounded.
   bool IsResolved() const;
   bool IsFinalized() const;
   bool IsBounded() const;
 
   // Return true if this vector contains a recursive type argument.
   bool IsRecursive() const;
 
   // Clone this type argument vector and clone all unfinalized type arguments.
   // Finalized type arguments are shared.
   RawTypeArguments* CloneUnfinalized() const;
 
   // Clone this type argument vector and clone all uninstantiated type
   // arguments, changing the class owner of type parameters.
   // Instantiated type arguments are shared.
   RawTypeArguments* CloneUninstantiated(
-      const Class& new_owner,
-      GrowableObjectArray* trail = NULL) const;
+      const Class& new_owner, TrailPtr trail = NULL) const;
 
   // Canonicalize only if instantiated, otherwise returns 'this'.
-  RawTypeArguments* Canonicalize(GrowableObjectArray* trail = NULL) const;
+  RawTypeArguments* Canonicalize(TrailPtr trail = NULL) const;
 
   // Return 'this' if this type argument vector is instantiated, i.e. if it does
   // not refer to type parameters. Otherwise, return a new type argument vector
   // where each reference to a type parameter is replaced with the corresponding
   // type of the instantiator type argument vector.
   // If bound_error is not NULL, it may be set to reflect a bound error.
   RawTypeArguments* InstantiateFrom(
       const TypeArguments& instantiator_type_arguments,
       Error* bound_error,
-      GrowableObjectArray* trail = NULL) const;
+      TrailPtr trail = NULL) const;
 
   // Runtime instantiation with canonicalization. Not to be used during type
   // finalization at compile time.
   RawTypeArguments* InstantiateAndCanonicalizeFrom(
       const TypeArguments& instantiator_type_arguments,
       Error* bound_error) const;
 
   // Return true if this type argument vector has cached instantiations.
   bool HasInstantiations() const;
 
@@ skipping 3308 matching lines @@
   virtual bool IsMalbounded() const;
   virtual bool IsMalformedOrMalbounded() const;
   virtual RawLanguageError* error() const;
   virtual void set_error(const LanguageError& value) const;
   virtual bool IsResolved() const;
   virtual bool HasResolvedTypeClass() const;
   virtual RawClass* type_class() const;
   virtual RawUnresolvedClass* unresolved_class() const;
   virtual RawTypeArguments* arguments() const;
   virtual intptr_t token_pos() const;
-  virtual bool IsInstantiated(GrowableObjectArray* trail = NULL) const;
+  virtual bool IsInstantiated(TrailPtr trail = NULL) const;
   virtual bool CanonicalizeEquals(const Instance& other) const {
     return Equals(other);
   }
   virtual bool Equals(const Instance& other) const {
     return IsEquivalent(other);
   }
-  virtual bool IsEquivalent(const Instance& other,
-                            GrowableObjectArray* trail = NULL) const;
+  virtual bool IsEquivalent(const Instance& other, TrailPtr trail = NULL) const;
   virtual bool IsRecursive() const;
 
   // Instantiate this type using the given type argument vector.
   // Return a new type, or return 'this' if it is already instantiated.
   // If bound_error is not NULL, it may be set to reflect a bound error.
   virtual RawAbstractType* InstantiateFrom(
       const TypeArguments& instantiator_type_arguments,
       Error* bound_error,
-      GrowableObjectArray* trail = NULL) const;
+      TrailPtr trail = NULL) const;
 
   // Return a clone of this unfinalized type or the type itself if it is
   // already finalized. Apply recursively to type arguments, i.e. finalized
   // type arguments of an unfinalized type are not cloned, but shared.
   virtual RawAbstractType* CloneUnfinalized() const;
 
   // Return a clone of this uninstantiated type where all references to type
   // parameters are replaced with references to type parameters of the same name
   // but belonging to the new owner class.
   // Apply recursively to type arguments, i.e. instantiated type arguments of
   // an uninstantiated type are not cloned, but shared.
   virtual RawAbstractType* CloneUninstantiated(
-      const Class& new_owner,
-      GrowableObjectArray* trail = NULL) const;
+      const Class& new_owner, TrailPtr trail = NULL) const;
 
   virtual RawInstance* CheckAndCanonicalize(const char** error_str) const {
     return Canonicalize();
   }
 
   // Return the canonical version of this type.
-  virtual RawAbstractType* Canonicalize(
-      GrowableObjectArray* trail = NULL) const;
+  virtual RawAbstractType* Canonicalize(TrailPtr trail = NULL) const;
 
   // Return the object associated with the receiver in the trail or
-  // Object::null() if the receiver is not contained in the trail.
-  RawObject* OnlyBuddyInTrail(GrowableObjectArray* trail) const;
+  // AbstractType::null() if the receiver is not contained in the trail.
+  RawAbstractType* OnlyBuddyInTrail(TrailPtr trail) const;
 
   // If the trail is null, allocate a trail, add the pair <receiver, buddy> to
   // the trail. The receiver may only be added once with its only buddy.
-  void AddOnlyBuddyToTrail(GrowableObjectArray** trail,
-                           const Object& buddy) const;
+  void AddOnlyBuddyToTrail(TrailPtr* trail, const AbstractType& buddy) const;
 
   // The name of this type, including the names of its type arguments, if any.
   virtual RawString* Name() const {
     return BuildName(kInternalName);
   }
 
   virtual RawString* PrettyName() const {
     return BuildName(kPrettyName);
   }
 
@@ skipping 118 matching lines @@
     return raw_ptr()->type_state_ >= RawType::kResolved;
   }
   void set_is_resolved() const;
   virtual bool HasResolvedTypeClass() const;  // Own type class resolved.
   virtual RawClass* type_class() const;
   void set_type_class(const Object& value) const;
   virtual RawUnresolvedClass* unresolved_class() const;
   virtual RawTypeArguments* arguments() const;
   void set_arguments(const TypeArguments& value) const;
   virtual intptr_t token_pos() const { return raw_ptr()->token_pos_; }
-  virtual bool IsInstantiated(GrowableObjectArray* trail = NULL) const;
-  virtual bool IsEquivalent(const Instance& other,
-                            GrowableObjectArray* trail = NULL) const;
+  virtual bool IsInstantiated(TrailPtr trail = NULL) const;
+  virtual bool IsEquivalent(const Instance& other, TrailPtr trail = NULL) const;
   virtual bool IsRecursive() const;
   virtual RawAbstractType* InstantiateFrom(
       const TypeArguments& instantiator_type_arguments,
       Error* malformed_error,
-      GrowableObjectArray* trail = NULL) const;
+      TrailPtr trail = NULL) const;
   virtual RawAbstractType* CloneUnfinalized() const;
   virtual RawAbstractType* CloneUninstantiated(
       const Class& new_owner,
-      GrowableObjectArray* trail = NULL) const;
-  virtual RawAbstractType* Canonicalize(
-      GrowableObjectArray* trail = NULL) const;
+      TrailPtr trail = NULL) const;
+  virtual RawAbstractType* Canonicalize(TrailPtr trail = NULL) const;
 
   virtual intptr_t Hash() const;
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawType));
   }
 
   // The type of the literal 'null'.
   static RawType* NullType();
 
@@ skipping 88 matching lines @@
   void set_type(const AbstractType& value) const;
   virtual RawClass* type_class() const {
     return AbstractType::Handle(type()).type_class();
   }
   virtual RawTypeArguments* arguments() const {
     return AbstractType::Handle(type()).arguments();
   }
   virtual intptr_t token_pos() const {
     return AbstractType::Handle(type()).token_pos();
   }
-  virtual bool IsInstantiated(GrowableObjectArray* trail = NULL) const;
+  virtual bool IsInstantiated(TrailPtr trail = NULL) const;
   virtual bool IsEquivalent(const Instance& other,
-                            GrowableObjectArray* trail = NULL) const;
+                            TrailPtr trail = NULL) const;
   virtual bool IsRecursive() const { return true; }
   virtual RawTypeRef* InstantiateFrom(
       const TypeArguments& instantiator_type_arguments,
       Error* bound_error,
-      GrowableObjectArray* trail = NULL) const;
+      TrailPtr trail = NULL) const;
   virtual RawTypeRef* CloneUninstantiated(
       const Class& new_owner,
-      GrowableObjectArray* trail = NULL) const;
-  virtual RawAbstractType* Canonicalize(
-      GrowableObjectArray* trail = NULL) const;
+      TrailPtr trail = NULL) const;
+  virtual RawAbstractType* Canonicalize(TrailPtr trail = NULL) const;
 
   virtual intptr_t Hash() const;
 
   // Return true if the receiver is contained in the trail.
   // Otherwise, if the trail is null, allocate a trail, then add the receiver to
   // the trail and return false.
-  bool TestAndAddToTrail(GrowableObjectArray** trail) const;
+  bool TestAndAddToTrail(TrailPtr* trail) const;
 
   // Return true if the pair <receiver, buddy> is contained in the trail.
   // Otherwise, if the trail is null, allocate a trail, add the pair <receiver,
   // buddy> to the trail and return false.
   // The receiver may be added several times, each time with a different buddy.
-  bool TestAndAddBuddyToTrail(GrowableObjectArray** trail,
-                              const Object& buddy) const;
+  bool TestAndAddBuddyToTrail(TrailPtr* trail, const AbstractType& buddy) const;
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawTypeRef));
   }
 
   static RawTypeRef* New(const AbstractType& type);
 
  private:
   static RawTypeRef* New();
 
@@ skipping 34 matching lines @@
   RawAbstractType* bound() const { return raw_ptr()->bound_; }
   void set_bound(const AbstractType& value) const;
   // Returns true if bounded_type is below upper_bound, otherwise return false
   // and set bound_error if both bounded_type and upper_bound are instantiated.
   // If one or both are not instantiated, returning false only means that the
   // bound cannot be checked yet and this is not an error.
   bool CheckBound(const AbstractType& bounded_type,
                   const AbstractType& upper_bound,
                   Error* bound_error) const;
   virtual intptr_t token_pos() const { return raw_ptr()->token_pos_; }
-  virtual bool IsInstantiated(GrowableObjectArray* trail = NULL) const {
+  virtual bool IsInstantiated(TrailPtr trail = NULL) const {
     return false;
   }
-  virtual bool IsEquivalent(const Instance& other,
-                            GrowableObjectArray* trail = NULL) const;
+  virtual bool IsEquivalent(const Instance& other, TrailPtr trail = NULL) const;
   virtual bool IsRecursive() const { return false; }
   virtual RawAbstractType* InstantiateFrom(
       const TypeArguments& instantiator_type_arguments,
       Error* bound_error,
-      GrowableObjectArray* trail = NULL) const;
+      TrailPtr trail = NULL) const;
   virtual RawAbstractType* CloneUnfinalized() const;
   virtual RawAbstractType* CloneUninstantiated(
-      const Class& new_owner,
-      GrowableObjectArray* trail = NULL) const;
-  virtual RawAbstractType* Canonicalize(
-      GrowableObjectArray* trail = NULL) const {
+      const Class& new_owner, TrailPtr trail = NULL) const;
+  virtual RawAbstractType* Canonicalize(TrailPtr trail = NULL) const {
     return raw();
   }
 
   virtual intptr_t Hash() const;
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawTypeParameter));
   }
 
   static RawTypeParameter* New(const Class& parameterized_class,
@@ skipping 47 matching lines @@
     return AbstractType::Handle(type()).arguments();
   }
   RawAbstractType* type() const { return raw_ptr()->type_; }
   RawAbstractType* bound() const { return raw_ptr()->bound_; }
   RawTypeParameter* type_parameter() const {
     return raw_ptr()->type_parameter_;
   }
   virtual intptr_t token_pos() const {
     return AbstractType::Handle(type()).token_pos();
   }
-  virtual bool IsInstantiated(GrowableObjectArray* trail = NULL) const {
+  virtual bool IsInstantiated(TrailPtr trail = NULL) const {
     // It is not possible to encounter an instantiated bounded type with an
     // uninstantiated upper bound. Therefore, we do not need to check if the
     // bound is instantiated. Moreover, doing so could lead into cycles, as in
     // class C<T extends C<C>> { }.
     return AbstractType::Handle(type()).IsInstantiated();
   }
-  virtual bool IsEquivalent(const Instance& other,
-                            GrowableObjectArray* trail = NULL) const;
+  virtual bool IsEquivalent(const Instance& other, TrailPtr trail = NULL) const;
   virtual bool IsRecursive() const;
   virtual RawAbstractType* InstantiateFrom(
       const TypeArguments& instantiator_type_arguments,
       Error* bound_error,
-      GrowableObjectArray* trail = NULL) const;
+      TrailPtr trail = NULL) const;
   virtual RawAbstractType* CloneUnfinalized() const;
   virtual RawAbstractType* CloneUninstantiated(
-      const Class& new_owner,
-      GrowableObjectArray* trail = NULL) const;
-  virtual RawAbstractType* Canonicalize(
-      GrowableObjectArray* trail = NULL) const {
+      const Class& new_owner, TrailPtr trail = NULL) const;
+  virtual RawAbstractType* Canonicalize(TrailPtr trail = NULL) const {
     return raw();
   }
 
   virtual intptr_t Hash() const;
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawBoundedType));
   }
 
   static RawBoundedType* New(const AbstractType& type,
@@ skipping 2571 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_