- Fix a lot of warnings generated by -Wshorten-64-to-32

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 123 matching lines @@
   };
 
   static const int kHeaderSize = 2 * sizeof(int64_t);
   static const int kLengthIndex = 0;
   static const int kSnapshotFlagIndex = 1;
 
   static const Snapshot* SetupFromBuffer(const void* raw_memory);
 
   // Getters.
   const uint8_t* content() const { return content_; }
-  int64_t length() const { return length_; }
+  intptr_t length() const { return static_cast<intptr_t>(length_); }
   Kind kind() const { return static_cast<Kind>(kind_); }
 
   bool IsMessageSnapshot() const { return kind_ == kMessage; }
   bool IsScriptSnapshot() const { return kind_ == kScript; }
   bool IsFullSnapshot() const { return kind_ == kFull; }
   uint8_t* Addr() { return reinterpret_cast<uint8_t*>(this); }
 
   static intptr_t length_offset() { return OFFSET_OF(Snapshot, length_); }
   static intptr_t kind_offset() {
     return OFFSET_OF(Snapshot, kind_);
@@ skipping 547 matching lines @@
  private:
   SnapshotWriter* writer_;
   bool as_references_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriterVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_SNAPSHOT_H_