VM: Precompiled rodata snapshot.

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 1327 matching lines @@
 
 
 RawInstructions* Instructions::ReadFrom(SnapshotReader* reader,
                                         intptr_t object_id,
                                         intptr_t tags,
                                         Snapshot::Kind kind,
                                         bool as_reference) {
   ASSERT(reader->snapshot_code());
   ASSERT(kind == Snapshot::kFull);
 
+#ifdef DEBUG
   intptr_t full_tags = static_cast<uword>(reader->Read<intptr_t>());
+#else
+  intptr_t full_tags = 0;  // unused in release mode
+#endif
   intptr_t offset = reader->Read<int32_t>();
   Instructions& result =
       Instructions::ZoneHandle(reader->zone(),
                                reader->GetInstructionsAt(offset, full_tags));
   reader->AddBackRef(object_id, &result, kIsDeserialized);
 
   return result.raw();
 }
 
 
 void RawInstructions::WriteTo(SnapshotWriter* writer,
                               intptr_t object_id,
                               Snapshot::Kind kind,
                               bool as_reference) {
   ASSERT(writer->snapshot_code());
   ASSERT(kind == Snapshot::kFull);
 
   writer->WriteInlinedObjectHeader(object_id);
   writer->WriteVMIsolateObject(kInstructionsCid);
   writer->WriteTags(writer->GetObjectTags(this));
 
+#ifdef DEBUG
   // Instructions will be written pre-marked and in the VM heap. Write out
   // the tags we expect to find when reading the snapshot for a sanity check
   // that our offsets/alignment didn't get out of sync.
   uword written_tags = writer->GetObjectTags(this);
   written_tags = RawObject::VMHeapObjectTag::update(true, written_tags);
   written_tags = RawObject::MarkBit::update(true, written_tags);
   writer->Write<intptr_t>(written_tags);
+#endif
 
   writer->Write<int32_t>(writer->GetInstructionsId(this));
 }
 
 
 RawObjectPool* ObjectPool::ReadFrom(SnapshotReader* reader,
                                     intptr_t object_id,
                                     intptr_t tags,
                                     Snapshot::Kind kind,
                                     bool as_reference) {
@@ skipping 117 matching lines @@
 
 
 RawPcDescriptors* PcDescriptors::ReadFrom(SnapshotReader* reader,
                                           intptr_t object_id,
                                           intptr_t tags,
                                           Snapshot::Kind kind,
                                           bool as_reference) {
   ASSERT(reader->snapshot_code());
   ASSERT(kind == Snapshot::kFull);
 
-  const int32_t length = reader->Read<int32_t>();
-  PcDescriptors& result =
-      PcDescriptors::ZoneHandle(reader->zone(),
-                                NEW_OBJECT_WITH_LEN(PcDescriptors, length));
+  intptr_t offset = reader->Read<int32_t>();
+  PcDescriptors& result = PcDescriptors::ZoneHandle(reader->zone());
+  result ^= reader->GetObjectAt(offset);
   reader->AddBackRef(object_id, &result, kIsDeserialized);
 
-  if (result.Length() > 0) {
-    NoSafepointScope no_safepoint;
-    intptr_t len = result.Length();
-    uint8_t* data = result.UnsafeMutableNonPointer(result.raw_ptr()->data());
-    reader->ReadBytes(data, len);
-  }
-
   return result.raw();
 }
 
 
 void RawPcDescriptors::WriteTo(SnapshotWriter* writer,
                                intptr_t object_id,
                                Snapshot::Kind kind,
                                bool as_reference) {
   ASSERT(writer->snapshot_code());
   ASSERT(kind == Snapshot::kFull);
 
   // Write out the serialization header value for this object.
   writer->WriteInlinedObjectHeader(object_id);
   writer->WriteIndexedObject(kPcDescriptorsCid);
   writer->WriteTags(writer->GetObjectTags(this));
-  writer->Write<int32_t>(ptr()->length_);
-  if (ptr()->length_ > 0) {
-    intptr_t len = ptr()->length_;
-    uint8_t* data = reinterpret_cast<uint8_t*>(ptr()->data());
-    writer->WriteBytes(data, len);
-  }
+
+  writer->Write<int32_t>(writer->GetObjectId(this));
 }
 
 
 RawStackmap* Stackmap::ReadFrom(SnapshotReader* reader,
                                 intptr_t object_id,
                                 intptr_t tags,
                                 Snapshot::Kind kind,
                                 bool as_reference) {
   ASSERT(reader->snapshot_code());
   ASSERT(kind == Snapshot::kFull);
 
-  const int32_t length = reader->Read<int32_t>();
-  Stackmap& result =
-      Stackmap::ZoneHandle(reader->zone(),
-                           reader->NewStackmap(length));
+  intptr_t offset = reader->Read<int32_t>();
+  Stackmap& result = Stackmap::ZoneHandle(reader->zone());
+  result ^= reader->GetObjectAt(offset);
   reader->AddBackRef(object_id, &result, kIsDeserialized);
 
-  result.SetRegisterBitCount(reader->Read<int32_t>());
-  result.SetPcOffset(reader->Read<uint32_t>());
-
-  if (length > 0) {
-    NoSafepointScope no_safepoint;
-    intptr_t len = (result.Length() + 7) / 8;
-    uint8_t* data = result.UnsafeMutableNonPointer(result.raw_ptr()->data());
-    reader->ReadBytes(data, len);
-  }
-
   return result.raw();
 }
 
 
 void RawStackmap::WriteTo(SnapshotWriter* writer,
                           intptr_t object_id,
                           Snapshot::Kind kind,
                           bool as_reference) {
   ASSERT(writer->snapshot_code());
   ASSERT(kind == Snapshot::kFull);
 
   // Write out the serialization header value for this object.
   writer->WriteInlinedObjectHeader(object_id);
   writer->WriteIndexedObject(kStackmapCid);
   writer->WriteTags(writer->GetObjectTags(this));
 
-  writer->Write<int32_t>(ptr()->length_);
-  writer->Write<int32_t>(ptr()->register_bit_count_);
-  writer->Write<uint32_t>(ptr()->pc_offset_);
-  if (ptr()->length_ > 0) {
-    intptr_t len = (ptr()->length_ + 7) / 8;
-    uint8_t* data = reinterpret_cast<uint8_t*>(ptr()->data());
-    writer->WriteBytes(data, len);
-  }
+  writer->Write<int32_t>(writer->GetObjectId(this));
 }
 
 
 RawLocalVarDescriptors* LocalVarDescriptors::ReadFrom(SnapshotReader* reader,
                                                       intptr_t object_id,
                                                       intptr_t tags,
                                                       Snapshot::Kind kind,
                                                       bool as_reference) {
   ASSERT(reader->snapshot_code());
   ASSERT(kind == Snapshot::kFull);
@@ skipping 1903 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