Introduce CodeSourceMap object to hold pc -> token position mappings

runtime/vm/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/snapshot.h"
 
 #include "platform/assert.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart.h"
@@ skipping 768 matching lines @@
   ASSERT(kind_ == Snapshot::kFull);
   ASSERT_NO_SAFEPOINT_SCOPE();
   RawPcDescriptors* obj = reinterpret_cast<RawPcDescriptors*>(
       AllocateUninitialized(kPcDescriptorsCid,
                             PcDescriptors::InstanceSize(len)));
   obj->ptr()->length_ = len;
   return obj;
 }
 
 
+RawCodeSourceMap* SnapshotReader::NewCodeSourceMap(intptr_t len) {
+  ASSERT(kind_ == Snapshot::kFull);
+  ASSERT_NO_SAFEPOINT_SCOPE();
+  RawCodeSourceMap* obj = reinterpret_cast<RawCodeSourceMap*>(
+      AllocateUninitialized(kCodeSourceMapCid,
+                            CodeSourceMap::InstanceSize(len)));
+  obj->ptr()->length_ = len;
+  return obj;
+}
+
+
 RawStackmap* SnapshotReader::NewStackmap(intptr_t len) {
   ASSERT(kind_ == Snapshot::kFull);
   ASSERT_NO_SAFEPOINT_SCOPE();
   RawStackmap* obj = reinterpret_cast<RawStackmap*>(
       AllocateUninitialized(kStackmapCid, Stackmap::InstanceSize(len)));
   obj->ptr()->length_ = len;
   return obj;
 }
 
 
@@ skipping 1791 matching lines @@
   if (setjmp(*jump.Set()) == 0) {
     NoSafepointScope no_safepoint;
     WriteObject(obj.raw());
   } else {
     ThrowException(exception_type(), exception_msg());
   }
 }
 
 
 }  // namespace dart