Move symbol table from per isolate snapshot to vm isolate snapshot, this reduces the per isolate in…

runtime/vm/dart_api_message.h

 // 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.
 
 #ifndef VM_DART_API_MESSAGE_H_
 #define VM_DART_API_MESSAGE_H_
 
 #include "include/dart_native_api.h"
 #include "vm/dart_api_state.h"
 #include "vm/snapshot.h"
@@ skipping 28 matching lines @@
 
 
 // Reads a message snapshot into a C structure.
 class ApiMessageReader : public BaseReader {
  public:
   // The allocator passed is used to allocate memory for the C structure used
   // to represent the message snapshot. This allocator must keep track of the
   // memory allocated as there is no way to run through the resulting C
   // structure and free the individual pieces. Using a zone based allocator is
   // recommended.
-  ApiMessageReader(const uint8_t* buffer, intptr_t length, ReAlloc alloc);
+  ApiMessageReader(const uint8_t* buffer,
+                   intptr_t length,
+                   ReAlloc alloc,
+                   bool use_vm_isolate_snapshot = true);
   ~ApiMessageReader() { }
 
   Dart_CObject* ReadMessage();
 
  private:
   class BackRefNode {
    public:
     BackRefNode(Dart_CObject* reference, DeserializeState state)
         : reference_(reference), state_(state) {}
     Dart_CObject* reference() const { return reference_; }
@@ skipping 27 matching lines @@
   Dart_CObject* AllocateDartCObjectBigint();
   // Allocates a Dart_CObject object for a double.
   Dart_CObject* AllocateDartCObjectDouble(double value);
   // Allocates a Dart_CObject object for string data.
   Dart_CObject* AllocateDartCObjectString(intptr_t length);
   // Allocates a C Dart_CObject object for a typed data.
   Dart_CObject* AllocateDartCObjectTypedData(
       Dart_TypedData_Type type, intptr_t length);
   // Allocates a C array of Dart_CObject objects.
   Dart_CObject* AllocateDartCObjectArray(intptr_t length);
+  // Allocate a C Dart_CObject object for a VM isolate object.
+  Dart_CObject* AllocateDartCObjectVmIsolateObj(intptr_t id);
   // Allocates a Dart_CObject_Internal object with the specified type.
   Dart_CObject_Internal* AllocateDartCObjectInternal(
       Dart_CObject_Internal::Type type);
   // Allocates a Dart_CObject_Internal object for a class object.
   Dart_CObject_Internal* AllocateDartCObjectClass();
   // Allocates a backwards reference node.
   BackRefNode* AllocateBackRefNode(Dart_CObject* ref, DeserializeState state);
 
   void Init();
 
@@ skipping 13 matching lines @@
   // Get an object from the backward references list.
   Dart_CObject* GetBackRef(intptr_t id);
 
   intptr_t NextAvailableObjectId() const;
 
   Dart_CObject_Internal* AsInternal(Dart_CObject* object) {
     ASSERT(object->type >= Dart_CObject_kNumberOfTypes);
     return reinterpret_cast<Dart_CObject_Internal*>(object);
   }
 
+  RawObject* VmIsolateSnapshotObject(intptr_t index) const {
+    return Object::vm_isolate_snapshot_object_table().At(index);
+  }
+
+  Dart_CObject* CreateDartCObjectString(RawObject* raw);
+
   // Allocation of the structures for the decoded message happens
   // either in the supplied zone or using the supplied allocation
   // function.
   ReAlloc alloc_;
   ApiGrowableArray<BackRefNode*> backward_references_;
   Dart_CObject** vm_symbol_references_;
+  intptr_t max_vm_isolate_object_id_;
 
   Dart_CObject type_arguments_marker;
   Dart_CObject dynamic_type_marker;
   static _Dart_CObject* singleton_uint32_typed_data_;
 };
 
 
 class ApiMessageWriter : public BaseWriter {
  public:
   static const intptr_t kInitialSize = 512;
@@ skipping 34 matching lines @@
   void WriteInlinedHeader(Dart_CObject* object);
   bool WriteCObject(Dart_CObject* object);
   bool WriteCObjectRef(Dart_CObject* object);
   bool WriteForwardedCObject(Dart_CObject* object);
   bool WriteCObjectInlined(Dart_CObject* object, Dart_CObject_Type type);
 
   intptr_t object_id_;
   Dart_CObject** forward_list_;
   intptr_t forward_list_length_;
   intptr_t forward_id_;
+  intptr_t max_vm_isolate_object_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ApiMessageWriter);
 };
 
 }  // namespace dart
 
 #endif  // VM_DART_API_MESSAGE_H_