In background compilation make a copy of Field in order to freeze its state

runtime/vm/parser.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/parser.h"
 #include "vm/flags.h"
 
 #ifndef DART_PRECOMPILED_RUNTIME
 
 #include "lib/invocation_mirror.h"
@@ skipping 144 matching lines @@
 void ParsedFunction::AddToGuardedFields(const Field* field) const {
   if ((field->guarded_cid() == kDynamicCid) ||
       (field->guarded_cid() == kIllegalCid)) {
     return;
   }
   for (intptr_t j = 0; j < guarded_fields_->length(); j++) {
     if ((*guarded_fields_)[j]->raw() == field->raw()) {
       return;
     }
   }
-  guarded_fields_->Add(field);
+  guarded_fields_->Add(&Field::ZoneHandle(Z, field->Original()));
 }
 
 
 LocalVariable* ParsedFunction::EnsureExpressionTemp() {
   if (!has_expression_temp_var()) {
     LocalVariable* temp =
         new (Z) LocalVariable(function_.token_pos(),
                               Symbols::ExprTemp(),
                               Object::dynamic_type());
     ASSERT(temp != NULL);
@@ skipping 894 matching lines @@
   }
 }
 
 
 RawObject* Parser::ParseMetadata(const Field& meta_data) {
   LongJumpScope jump;
   if (setjmp(*jump.Set()) == 0) {
     Thread* thread = Thread::Current();
     StackZone stack_zone(thread);
     Zone* zone = stack_zone.GetZone();
-    const Class& owner_class = Class::Handle(zone, meta_data.owner());
-    const Script& script = Script::Handle(zone, meta_data.script());
+    const Class& owner_class = Class::Handle(zone, meta_data.Owner());
+    const Script& script = Script::Handle(zone, meta_data.Script());
     const TokenPosition token_pos = meta_data.token_pos();
     // Parsing metadata can involve following paths in the parser that are
     // normally used for expressions and assume current_function is non-null,
     // so we create a fake function to use as the current_function rather than
     // scattering special cases throughout the parser.
     const Function& fake_function = Function::ZoneHandle(zone, Function::New(
         Symbols::At(),
         RawFunction::kRegularFunction,
         true,  // is_static
         false,  // is_const
@@ skipping 119 matching lines @@
 ParsedFunction* Parser::ParseStaticFieldInitializer(const Field& field) {
   ASSERT(field.is_static());
   Thread* thread = Thread::Current();
   // TODO(koda): Should there be a StackZone here?
   Zone* zone = thread->zone();
 
   const String& field_name = String::Handle(zone, field.name());
   String& init_name = String::Handle(zone,
       Symbols::FromConcat(Symbols::InitPrefix(), field_name));
 
-  const Script& script = Script::Handle(zone, field.script());
-  Object& initializer_owner = Object::Handle(field.owner());
+  const Script& script = Script::Handle(zone, field.Script());
+  Object& initializer_owner = Object::Handle(field.Owner());
   initializer_owner =
-      PatchClass::New(Class::Handle(field.owner()), script);
+      PatchClass::New(Class::Handle(field.Owner()), script);
 
   const Function& initializer = Function::ZoneHandle(zone,
       Function::New(init_name,
                     RawFunction::kImplicitStaticFinalGetter,
                     true,   // static
                     false,  // !const
                     false,  // !abstract
                     false,  // !external
                     false,  // !native
                     initializer_owner,
@@ skipping 1306 matching lines @@
     if (field.is_static()) {
       continue;
     }
 
     bool found = false;
     for (int i = 0; i < initializers->length(); i++) {
       found = false;
       if (initializers->NodeAt(i)->IsStoreInstanceFieldNode()) {
         StoreInstanceFieldNode* initializer =
             initializers->NodeAt(i)->AsStoreInstanceFieldNode();
-        if (initializer->field().raw() == field.raw()) {
+        ASSERT(field.IsOriginal());
+        if (initializer->field().Original() == field.raw()) {
           found = true;
           break;
         }
       }
     }
 
     if (found) continue;
 
     field.RecordStore(Object::null_object());
   }
 }
 
 
 AstNode* Parser::ParseExternalInitializedField(const Field& field) {
   // Only use this function if the initialized field originates
   // from a different class. We need to save and restore current
   // class, library, and token stream (script).
-  ASSERT(current_class().raw() != field.origin());
+  ASSERT(current_class().raw() != field.Origin());
   const Class& saved_class = Class::Handle(Z, current_class().raw());
   const Library& saved_library = Library::Handle(Z, library().raw());
   const Script& saved_script = Script::Handle(Z, script().raw());
   const TokenPosition saved_token_pos = TokenPos();
 
-  set_current_class(Class::Handle(Z, field.origin()));
+  set_current_class(Class::Handle(Z, field.Origin()));
   set_library(Library::Handle(Z, current_class().library()));
   SetScript(Script::Handle(Z, current_class().script()), field.token_pos());
 
   ASSERT(IsIdentifier());
   ConsumeToken();
   ExpectToken(Token::kASSIGN);
   AstNode* init_expr = NULL;
   TokenPosition expr_pos = TokenPos();
   if (field.is_const()) {
     init_expr = ParseConstExpr();
@@ skipping 27 matching lines @@
     if (!f.is_static() && f.has_initializer()) {
       Field& field = Field::ZoneHandle(Z);
       field ^= fields.At(i);
       if (field.is_final()) {
         // Final fields with initializer expression may not be initialized
         // again by constructors. Remember that this field is already
         // initialized.
         initialized_fields->Add(&field);
       }
       AstNode* init_expr = NULL;
-      if (current_class().raw() != field.origin()) {
+      if (current_class().raw() != field.Origin()) {
         init_expr = ParseExternalInitializedField(field);
       } else {
         SetPosition(field.token_pos());
         ASSERT(IsIdentifier());
         ConsumeToken();
         ExpectToken(Token::kASSIGN);
         if (current_class().is_const()) {
           // If the class has a const contructor, the initializer
           // expression must be a compile-time constant.
           init_expr = ParseConstExpr();
@@ skipping 8041 matching lines @@
                                       bool is_compound /* = false */) {
   AstNode* result = original->MakeAssignmentNode(rhs);
   if (result == NULL) {
     String& name = String::ZoneHandle(Z);
     const Class* target_cls = &current_class();
     if (original->IsTypeNode()) {
       name = Symbols::New(original->AsTypeNode()->TypeName());
     } else if (original->IsLoadStaticFieldNode()) {
       name = original->AsLoadStaticFieldNode()->field().name();
       target_cls = &Class::Handle(Z,
-          original->AsLoadStaticFieldNode()->field().owner());
+          original->AsLoadStaticFieldNode()->field().Owner());
     } else if ((left_ident != NULL) &&
                (original->IsLiteralNode() ||
                 original->IsLoadLocalNode())) {
       name = left_ident->raw();
     }
     if (name.IsNull()) {
       ReportError(left_pos, "expression is not assignable");
     }
     LetNode* let_node = new(Z) LetNode(left_pos);
     let_node->AddInitializer(rhs);
@@ skipping 477 matching lines @@
   // If the static field has an initializer, initialize the field at compile
   // time, which is only possible if the field is const.
   AstNode* initializing_getter = RunStaticFieldInitializer(field, ident_pos);
   if (initializing_getter != NULL) {
     // The field is not yet initialized and could not be initialized at compile
     // time. The getter will initialize the field.
     return initializing_getter;
   }
   // The field is initialized.
   ASSERT(field.is_static());
-  const Class& field_owner = Class::ZoneHandle(Z, field.owner());
+  const Class& field_owner = Class::ZoneHandle(Z, field.Owner());
   const String& field_name = String::ZoneHandle(Z, field.name());
   const String& getter_name =
       String::Handle(Z, Field::GetterSymbol(field_name));
   const Function& getter = Function::Handle(Z,
       field_owner.LookupStaticFunction(getter_name));
   // Never load field directly if there is a getter (deterministic AST).
   if (getter.IsNull() || field.is_const()) {
     return new(Z) LoadStaticFieldNode(
         ident_pos, Field::ZoneHandle(Z, field.raw()));
   } else {
@@ skipping 822 matching lines @@
   return result.raw();
 }
 
 
 // If the field is already initialized, return no ast (NULL).
 // Otherwise, if the field is constant, initialize the field and return no ast.
 // If the field is not initialized and not const, return the ast for the getter.
 StaticGetterNode* Parser::RunStaticFieldInitializer(
     const Field& field, TokenPosition field_ref_pos) {
   ASSERT(field.is_static());
-  const Class& field_owner = Class::ZoneHandle(Z, field.owner());
+  const Class& field_owner = Class::ZoneHandle(Z, field.Owner());
   const String& field_name = String::ZoneHandle(Z, field.name());
   const String& getter_name =
       String::Handle(Z, Field::GetterSymbol(field_name));
   const Function& getter = Function::Handle(Z,
       field_owner.LookupStaticFunction(getter_name));
   const Instance& value = Instance::Handle(Z, field.StaticValue());
   if (value.raw() == Object::transition_sentinel().raw()) {
     if (field.is_const()) {
       ReportError("circular dependency while initializing static field '%s'",
                   field_name.ToCString());
@@ skipping 2376 matching lines @@
     const ArgumentListNode& function_args,
     const LocalVariable* temp_for_last_arg,
     bool is_super_invocation) {
   UNREACHABLE();
   return NULL;
 }
 
 }  // namespace dart
 
 #endif  // DART_PRECOMPILED_RUNTIME