Precompilation: drop unused types and type arguments and empty classes and libraries.

runtime/vm/raw_object_snapshot.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/native_entry.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/snapshot.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
@@ skipping 97 matching lines @@
   // Write out the boolean is_in_fullsnapshot first as this will
   // help the reader decide how the rest of the information needs
   // to be interpreted.
   writer->Write<bool>(is_in_fullsnapshot);
 
   if ((kind == Snapshot::kFull) ||
       (kind == Snapshot::kScript && !is_in_fullsnapshot)) {
     // Write out all the non object pointer fields.
     // NOTE: cpp_vtable_ is not written.
     classid_t class_id = ptr()->id_;
+    ASSERT(class_id != kIllegalCid);
     writer->Write<classid_t>(class_id);
     if (!RawObject::IsInternalVMdefinedClassId(class_id)) {
       // We don't write the instance size of VM defined classes as they
       // are already setup during initialization as part of pre populating
       // the class table.
       writer->Write<int32_t>(ptr()->instance_size_in_words_);
       writer->Write<int32_t>(ptr()->next_field_offset_in_words_);
     }
     writer->Write<int32_t>(ptr()->type_arguments_field_offset_in_words_);
     writer->Write<uint16_t>(ptr()->num_type_arguments_);
@@ skipping 1159 matching lines @@
   // help the reader decide how the rest of the information needs
   // to be interpreted.
   writer->Write<bool>(ptr()->is_in_fullsnapshot_);
 
   if ((kind == Snapshot::kScript) && ptr()->is_in_fullsnapshot_) {
     // Write out library URL so that it can be looked up when reading.
     writer->WriteObjectImpl(ptr()->url_, kAsInlinedObject);
   } else {
     ASSERT((kind == Snapshot::kFull) || !ptr()->is_in_fullsnapshot_);
     // Write out all non object fields.
+    ASSERT(ptr()->index_ != static_cast<classid_t>(-1));
     writer->WriteClassIDValue(ptr()->index_);
     writer->Write<uint16_t>(ptr()->num_imports_);
     writer->Write<int8_t>(ptr()->load_state_);
     writer->Write<bool>(ptr()->corelib_imported_);
     writer->Write<bool>(ptr()->is_dart_scheme_);
     writer->Write<bool>(ptr()->debuggable_);
     // We do not serialize the native resolver or symbolizer. These need to be
     // explicitly set after deserialization.
 
     // We do not write the loaded_scripts_ and resolved_names_ caches to the
@@ skipping 20 matching lines @@
   reader->AddBackRef(object_id, &prefix, kIsDeserialized);
 
   // Set all non object fields.
   prefix.StoreNonPointer(&prefix.raw_ptr()->num_imports_,
                          reader->Read<int16_t>());
   prefix.StoreNonPointer(&prefix.raw_ptr()->is_deferred_load_,
                          reader->Read<bool>());
   prefix.StoreNonPointer(&prefix.raw_ptr()->is_loaded_, reader->Read<bool>());
 
   // Set all the object fields.
+  RawObject** toobj = reader->snapshot_code()
+      ? prefix.raw()->to_precompiled_snapshot()
+      : prefix.raw()->to();
   READ_OBJECT_FIELDS(prefix,
-                     prefix.raw()->from(), prefix.raw()->to(),
+                     prefix.raw()->from(), toobj,
                      kAsReference);
+  if (reader->snapshot_code()) {
+    prefix.StorePointer(&prefix.raw_ptr()->imports_,
+                        Array::null());
+    prefix.StorePointer(&prefix.raw_ptr()->dependent_code_,
+                        Array::null());
+  }
 
   return prefix.raw();
 }
 
 
 void RawLibraryPrefix::WriteTo(SnapshotWriter* writer,
                                intptr_t object_id,
                                Snapshot::Kind kind,
                                bool as_reference) {
   ASSERT(writer != NULL);
   ASSERT((kind == Snapshot::kScript) || (kind == Snapshot::kFull));
 
   // Write out the serialization header value for this object.
   writer->WriteInlinedObjectHeader(object_id);
 
   // Write out the class and tags information.
   writer->WriteIndexedObject(kLibraryPrefixCid);
   writer->WriteTags(writer->GetObjectTags(this));
 
   // Write out all non object fields.
   writer->Write<int16_t>(ptr()->num_imports_);
   writer->Write<bool>(ptr()->is_deferred_load_);
   writer->Write<bool>(ptr()->is_loaded_);
 
   // Write out all the object pointer fields.
   SnapshotWriterVisitor visitor(writer, kAsReference);
-  visitor.VisitPointers(from(), to());
+  RawObject** toobj = writer->snapshot_code() ? to_precompiled_snapshot()
+                                              : to();
+  visitor.VisitPointers(from(), toobj);
 }
 
 
 RawNamespace* Namespace::ReadFrom(SnapshotReader* reader,
                                   intptr_t object_id,
                                   intptr_t tags,
                                   Snapshot::Kind kind,
                                   bool as_reference) {
   ASSERT(reader != NULL);
   ASSERT((kind == Snapshot::kScript) || (kind == Snapshot::kFull));
@@ skipping 623 matching lines @@
   result.set_deopt_id(reader->Read<int32_t>());
   result.set_state_bits(reader->Read<uint32_t>());
 
   // Set all the object fields.
   RawObject** toobj = reader->snapshot_code()
       ? result.raw()->to_precompiled_snapshot()
       : result.raw()->to();
   READ_OBJECT_FIELDS(result,
                      result.raw()->from(), toobj,
                      kAsReference);
+  if (reader->snapshot_code()) {
+    result.set_owner(Function::Handle(reader->zone()));
+  }
 
   return result.raw();
 }
 
 
 void RawICData::WriteTo(SnapshotWriter* writer,
                         intptr_t object_id,
                         Snapshot::Kind kind,
                         bool as_reference) {
   ASSERT((kind == Snapshot::kScript) || (kind == Snapshot::kFull));
@@ skipping 1698 matching lines @@
     // We do not allow objects with native fields in an isolate message.
     writer->SetWriteException(Exceptions::kArgument,
                               "Illegal argument in isolate message"
                               " : (object is a UserTag)");
   } else {
     UNREACHABLE();
   }
 }
 
 }  // namespace dart