- Handle doubles transferred in message snapshots specially.

runtime/vm/snapshot.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_SNAPSHOT_H_
 #define VM_SNAPSHOT_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/bitfield.h"
@@ skipping 164 matching lines @@
   intptr_t ReadIntptrValue() {
     int64_t value = Read<int64_t>();
     ASSERT((value <= kIntptrMax) && (value >= kIntptrMin));
     return static_cast<intptr_t>(value);
   }
 
   void ReadBytes(uint8_t* addr, intptr_t len) {
     stream_.ReadBytes(addr, len);
   }
 
+  double ReadDouble() {
+    double result;
+    stream_.ReadBytes(reinterpret_cast<uint8_t*>(&result), sizeof(result));
+    return result;
+  }
+
+
   const uint8_t* CurrentBufferAddress() const {
     return stream_.AddressOfCurrentPosition();
   }
 
   void Advance(intptr_t value) {
     stream_.Advance(value);
   }
 
   RawSmi* ReadAsSmi();
   intptr_t ReadSmiValue();
@@ skipping 219 matching lines @@
     value = SerializedHeaderTag::update(kInlined, value);
     value = SerializedHeaderData::update(id, value);
     WriteIntptrValue(value);
   }
 
   // Write out a buffer of bytes.
   void WriteBytes(const uint8_t* addr, intptr_t len) {
     stream_.WriteBytes(addr, len);
   }
 
+  void WriteDouble(double value) {
+    stream_.WriteBytes(reinterpret_cast<const uint8_t*>(&value), sizeof(value));
+  }
+
  protected:
   BaseWriter(uint8_t** buffer,
              ReAlloc alloc,
              intptr_t initial_size) : stream_(buffer, alloc, initial_size) {
     ASSERT(buffer != NULL);
     ASSERT(alloc != NULL);
   }
   ~BaseWriter() { }
 
   void ReserveHeader() {
@@ skipping 185 matching lines @@
  private:
   SnapshotWriter* writer_;
   bool as_references_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriterVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_SNAPSHOT_H_