VM: Precompiled rodata snapshot.

runtime/vm/dart.cc

 // Copyright (c) 2013, 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/dart.h"
 
 #include "vm/code_observers.h"
 #include "vm/cpu.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
@@ skipping 30 matching lines @@
 DECLARE_FLAG(bool, pause_isolates_on_exit);
 DEFINE_FLAG(bool, keep_code, false,
             "Keep deoptimized code for profiling.");
 DEFINE_FLAG(bool, shutdown, true, "Do a clean shutdown of the VM");
 
 Isolate* Dart::vm_isolate_ = NULL;
 ThreadPool* Dart::thread_pool_ = NULL;
 DebugInfo* Dart::pprof_symbol_generator_ = NULL;
 ReadOnlyHandles* Dart::predefined_handles_ = NULL;
 const uint8_t* Dart::instructions_snapshot_buffer_ = NULL;
+const uint8_t* Dart::data_snapshot_buffer_ = NULL;
 
 // Structure for managing read-only global handles allocation used for
 // creating global read-only handles that are pre created and initialized
 // for use across all isolates. Having these global pre created handles
 // stored in the vm isolate ensures that we don't constantly create and
 // destroy handles for read-only objects referred in the VM code
 // (e.g: symbols, null object, empty array etc.)
 // The ReadOnlyHandles C++ Wrapper around VMHandles which is a ValueObject is
 // to ensure that the handles area is not trashed by automatic running of C++
 // static destructors when 'exit()" is called by any isolate. There might be
 // other isolates running at the same time and trashing the handles area will
 // have unintended consequences.
 class ReadOnlyHandles {
  public:
   ReadOnlyHandles() { }
 
  private:
   VMHandles handles_;
   LocalHandles api_handles_;
 
   friend class Dart;
   DISALLOW_COPY_AND_ASSIGN(ReadOnlyHandles);
 };
 
 
 const char* Dart::InitOnce(const uint8_t* vm_isolate_snapshot,
                            const uint8_t* instructions_snapshot,
+                           const uint8_t* data_snapshot,
                            Dart_IsolateCreateCallback create,
                            Dart_IsolateShutdownCallback shutdown,
                            Dart_FileOpenCallback file_open,
                            Dart_FileReadCallback file_read,
                            Dart_FileWriteCallback file_write,
                            Dart_FileCloseCallback file_close,
                            Dart_EntropySource entropy_source,
                            Dart_GetVMServiceAssetsArchive get_service_assets) {
   // TODO(iposva): Fix race condition here.
   if (vm_isolate_ != NULL || !Flags::Initialized()) {
@@ skipping 60 matching lines @@
     Object::InitOnce(vm_isolate_);
     ArgumentsDescriptor::InitOnce();
     ICData::InitOnce();
     // When precompiled the stub code is initialized from the snapshot.
     if (!precompiled) {
       StubCode::InitOnce();
     }
     if (vm_isolate_snapshot != NULL) {
       if (instructions_snapshot != NULL) {
         vm_isolate_->SetupInstructionsSnapshotPage(instructions_snapshot);
+        ASSERT(data_snapshot != NULL);
+        vm_isolate_->SetupDataSnapshotPage(data_snapshot);
       }
       const Snapshot* snapshot = Snapshot::SetupFromBuffer(vm_isolate_snapshot);
       if (snapshot == NULL) {
         return "Invalid vm isolate snapshot seen.";
       }
       ASSERT(snapshot->kind() == Snapshot::kFull);
       VmIsolateSnapshotReader reader(snapshot->content(),
                                      snapshot->length(),
                                      instructions_snapshot,
+                                     data_snapshot,
                                      T);
       const Error& error = Error::Handle(reader.ReadVmIsolateSnapshot());
       if (!error.IsNull()) {
         return error.ToCString();
       }
       if (FLAG_trace_isolates) {
         OS::Print("Size of vm isolate snapshot = %" Pd "\n",
                   snapshot->length());
         vm_isolate_->heap()->PrintSizes();
         MegamorphicCacheTable::PrintSizes(vm_isolate_);
@@ skipping 176 matching lines @@
           String::New("Invalid snapshot."));
       return ApiError::New(message);
     }
     ASSERT(snapshot->kind() == Snapshot::kFull);
     if (FLAG_trace_isolates) {
       OS::Print("Size of isolate snapshot = %" Pd "\n", snapshot->length());
     }
     IsolateSnapshotReader reader(snapshot->content(),
                                  snapshot->length(),
                                  Dart::instructions_snapshot_buffer(),
+                                 Dart::data_snapshot_buffer(),
                                  T);
     const Error& error = Error::Handle(reader.ReadFullSnapshot());
     if (!error.IsNull()) {
       return error.raw();
     }
     if (FLAG_trace_isolates) {
       I->heap()->PrintSizes();
       MegamorphicCacheTable::PrintSizes(I);
     }
   } else {
@@ skipping 112 matching lines @@
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 
 bool Dart::IsReadOnlyApiHandle(Dart_Handle handle) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->api_handles_.IsValidHandle(handle);
 }
 
 }  // namespace dart