- Support for patching of class methods and fields.

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/bigint_operations.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/snapshot.h"
 #include "vm/symbols.h"
 #include "vm/visitor.h"
@@ skipping 393 matching lines @@
   // Write out the class and tags information.
   writer->WriteVMIsolateObject(kInstantiatedTypeArgumentsCid);
   writer->WriteIntptrValue(writer->GetObjectTags(this));
 
   // Write out all the object pointer fields.
   SnapshotWriterVisitor visitor(writer, false);
   visitor.VisitPointers(from(), to());
 }
 
 
+RawPatchClass* PatchClass::ReadFrom(SnapshotReader* reader,
+                                    intptr_t object_id,
+                                    intptr_t tags,
+                                    Snapshot::Kind kind) {
+  ASSERT(reader != NULL);
+  ASSERT(kind != Snapshot::kMessage && !RawObject::IsCreatedFromSnapshot(tags));
+
+  // Allocate function object.
+  PatchClass& cls = PatchClass::ZoneHandle(reader->isolate(),
+                                            NEW_OBJECT(PatchClass));
+  reader->AddBackRef(object_id, &cls, kIsDeserialized);
+
+  // Set the object tags.
+  cls.set_tags(tags);
+
+  // Set all the object fields.
+  // TODO(5411462): Need to assert No GC can happen here, even though
+  // allocations may happen.
+  intptr_t num_flds = (cls.raw()->to() - cls.raw()->from());
+  for (intptr_t i = 0; i <= num_flds; i++) {
+    *(cls.raw()->from() + i) = reader->ReadObjectRef();
+  }
+
+  return cls.raw();
+}
+
+
+void RawPatchClass::WriteTo(SnapshotWriter* writer,
+                            intptr_t object_id,
+                            Snapshot::Kind kind) {
+  ASSERT(writer != NULL);
+  ASSERT(kind != Snapshot::kMessage &&
+         !RawObject::IsCreatedFromSnapshot(writer->GetObjectTags(this)));
+
+  // Write out the serialization header value for this object.
+  writer->WriteInlinedObjectHeader(object_id);
+
+  // Write out the class and tags information.
+  writer->WriteVMIsolateObject(kPatchClassCid);
+  writer->WriteIntptrValue(writer->GetObjectTags(this));
+  // Write out all the object pointer fields.
+  SnapshotWriterVisitor visitor(writer);
+  visitor.VisitPointers(from(), to());
+}
+
+
 RawFunction* Function::ReadFrom(SnapshotReader* reader,
                                 intptr_t object_id,
                                 intptr_t tags,
                                 Snapshot::Kind kind) {
   ASSERT(reader != NULL);
   ASSERT(kind != Snapshot::kMessage && !RawObject::IsCreatedFromSnapshot(tags));
 
   // Allocate function object.
   Function& func = Function::ZoneHandle(
       reader->isolate(), NEW_OBJECT(Function));
@@ skipping 1589 matching lines @@
   writer->Write<RawObject*>(ptr()->num_bracket_expressions_);
   writer->WriteObjectImpl(ptr()->pattern_);
   writer->WriteIntptrValue(ptr()->type_);
   writer->WriteIntptrValue(ptr()->flags_);
 
   // Do not write out the data part which is native.
 }
 
 
 }  // namespace dart