Delay Class parsing until the class is actually used.

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 587 matching lines @@
 
   RawString* Name() const;
   RawString* UserVisibleName() const;
 
   virtual RawString* DictionaryName() const { return Name(); }
 
   RawScript* script() const { return raw_ptr()->script_; }
   void set_script(const Script& value) const;
 
   intptr_t token_pos() const { return raw_ptr()->token_pos_; }
+  void set_token_pos(intptr_t value) const;
 
   // This class represents the signature class of a closure function if
   // signature_function() is not null.
   // The associated function may be a closure function (with code) or a
   // signature function (without code) solely describing the result type and
   // parameter types of the signature.
   RawFunction* signature_function() const {
     return raw_ptr()->signature_function_;
   }
   static intptr_t signature_function_offset() {
@@ skipping 27 matching lines @@
                                         intptr_t token_pos) const;
 
   // The type argument vector is flattened and includes the type arguments of
   // the super class.
   bool HasTypeArguments() const;
   intptr_t NumTypeArguments() const;
 
   // If this class is parameterized, each instance has a type_arguments field.
   static const intptr_t kNoTypeArguments = -1;
   intptr_t type_arguments_field_offset() const {
-    ASSERT(is_finalized() || is_prefinalized());
+    ASSERT(is_type_finalized() || is_prefinalized());
     if (raw_ptr()->type_arguments_field_offset_in_words_ == kNoTypeArguments) {
       return kNoTypeArguments;
     }
     return raw_ptr()->type_arguments_field_offset_in_words_ * kWordSize;
   }
   void set_type_arguments_field_offset(intptr_t value_in_bytes) const {
     intptr_t value;
     if (value_in_bytes == kNoTypeArguments) {
       value = kNoTypeArguments;
     } else {
@@ skipping 17 matching lines @@
   static intptr_t super_type_offset() {
     return OFFSET_OF(RawClass, super_type_);
   }
 
   // Asserts that the class of the super type has been resolved.
   RawClass* SuperClass() const;
 
   RawType* mixin() const { return raw_ptr()->mixin_; }
   void set_mixin(const Type& value) const;
 
+  RawClass* patch_class() const {
+    return raw_ptr()->patch_class_;
+  }
+  void set_patch_class(const Class& patch_class) const;
+
   // Interfaces is an array of Types.
   RawArray* interfaces() const { return raw_ptr()->interfaces_; }
   void set_interfaces(const Array& value) const;
   static intptr_t interfaces_offset() {
     return OFFSET_OF(RawClass, interfaces_);
   }
 
   // Returns the list of classes having this class as direct superclass.
   RawGrowableObjectArray* direct_subclasses() const {
     return raw_ptr()->direct_subclasses_;
@@ skipping 98 matching lines @@
   bool is_implemented() const {
     return ImplementedBit::decode(raw_ptr()->state_bits_);
   }
   void set_is_implemented() const;
 
   bool is_abstract() const {
     return AbstractBit::decode(raw_ptr()->state_bits_);
   }
   void set_is_abstract() const;
 
+  bool is_type_finalized() const {
+    return TypeFinalizedBit::decode(raw_ptr()->state_bits_);
+  }
+  void set_is_type_finalized() const;
+
+  bool is_patch() const {
+    return PatchBit::decode(raw_ptr()->state_bits_);
+  }
+  void set_is_patch() const;
+
+  bool is_synthesized_class() const {
+    return SynthesizedClassBit::decode(raw_ptr()->state_bits_);
+  }
+  void set_is_synthesized_class() const;
+
   bool is_finalized() const {
     return StateBits::decode(raw_ptr()->state_bits_) == RawClass::kFinalized;
   }
   void set_is_finalized() const;
 
   bool is_prefinalized() const {
     return StateBits::decode(raw_ptr()->state_bits_) == RawClass::kPreFinalized;
   }
 
   void set_is_prefinalized() const;
 
+  bool is_marked_for_parsing() const {
+    return MarkedForParsingBit::decode(raw_ptr()->state_bits_);
+  }
+  void set_is_marked_for_parsing() const;
+  void reset_is_marked_for_parsing() const;
+
   bool is_const() const { return ConstBit::decode(raw_ptr()->state_bits_); }
   void set_is_const() const;
 
   int num_native_fields() const {
     return raw_ptr()->num_native_fields_;
   }
   void set_num_native_fields(int value) const {
     raw_ptr()->num_native_fields_ = value;
   }
   static intptr_t num_native_fields_offset() {
     return OFFSET_OF(RawClass, num_native_fields_);
   }
 
   RawCode* allocation_stub() const {
     return raw_ptr()->allocation_stub_;
   }
   void set_allocation_stub(const Code& value) const;
 
   RawArray* constants() const;
 
   void Finalize() const;
 
   const char* ApplyPatch(const Class& patch) const;
 
+  RawError* EnsureIsFinalized(Isolate* isolate) const;
+
   // Allocate a class used for VM internal objects.
   template <class FakeObject> static RawClass* New();
 
   // Allocate instance classes.
   static RawClass* New(const String& name,
                        const Script& script,
                        intptr_t token_pos);
   static RawClass* NewNativeWrapper(const Library& library,
                                     const String& name,
                                     int num_fields);
@@ skipping 25 matching lines @@
   // Patch the signature function of a signature class allocated without it.
   void PatchSignatureFunction(const Function& signature_function) const;
 
   // Return a class object corresponding to the specified kind. If
   // a canonicalized version of it exists then that object is returned
   // otherwise a new object is allocated and returned.
   static RawClass* GetClass(intptr_t class_id, bool is_signature_class);
 
  private:
   enum {
-    kConstBit = 1,
-    kImplementedBit = 2,
-    kAbstractBit = 3,
-    kStateTagBit = 4,
+    kConstBit = 0,
+    kImplementedBit = 1,
+    kAbstractBit = 2,
+    kPatchBit = 3,
+    kSynthesizedClassBit = 4,
+    kTypeFinalizedBit = 5,
+    kStateTagBit = 6,
     kStateTagSize = 2,
+    kMarkedForParsingBit = 8,
   };
   class ConstBit : public BitField<bool, kConstBit, 1> {};
   class ImplementedBit : public BitField<bool, kImplementedBit, 1> {};
   class AbstractBit : public BitField<bool, kAbstractBit, 1> {};
+  class PatchBit : public BitField<bool, kPatchBit, 1> {};
+  class SynthesizedClassBit : public BitField<bool, kSynthesizedClassBit, 1> {};
+  class TypeFinalizedBit : public BitField<bool, kTypeFinalizedBit, 1> {};
   class StateBits : public BitField<RawClass::ClassState,
                                     kStateTagBit, kStateTagSize> {};  // NOLINT
+  class MarkedForParsingBit : public BitField<bool, kMarkedForParsingBit, 1> {};
 
   void set_name(const String& value) const;
-  void set_token_pos(intptr_t value) const;
   void set_signature_function(const Function& value) const;
   void set_signature_type(const AbstractType& value) const;
   void set_class_state(RawClass::ClassState state) const;
   void set_state_bits(intptr_t bits) const;
 
   void set_constants(const Array& value) const;
 
   void set_canonical_types(const Array& value) const;
   RawArray* canonical_types() const;
 
@@ skipping 4851 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_