Cleanup app snapshots on isolate/vm exit.

runtime/bin/isolate_data.cc

Index: runtime/bin/isolate_data.cc
diff --git a/runtime/bin/isolate_data.cc b/runtime/bin/isolate_data.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b37cf178431042b05f922e5e3c17e02a6a74a7d5
--- /dev/null
+++ b/runtime/bin/isolate_data.cc
@@ -0,0 +1,48 @@
+// Copyright (c) 2017, 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 "bin/isolate_data.h"
+#include "bin/snapshot_utils.h"
+
+namespace dart {
+namespace bin {
+
+IsolateData::IsolateData(const char* url,
+                         const char* package_root,
+                         const char* packages_file,
+                         AppSnapshot* app_snapshot)
+    : script_url((url != NULL) ? strdup(url) : NULL),
+      package_root(NULL),
+      packages_file(NULL),
+      udp_receive_buffer(NULL),
+      builtin_lib_(NULL),
+      loader_(NULL),
+      app_snapshot_(app_snapshot) {
+  if (package_root != NULL) {
+    ASSERT(packages_file == NULL);
+    this->package_root = strdup(package_root);
+  } else if (packages_file != NULL) {
+    this->packages_file = strdup(packages_file);
+  }
+}
+
+
+IsolateData::~IsolateData() {
+  free(script_url);
+  script_url = NULL;
+  free(package_root);
+  package_root = NULL;
+  free(packages_file);
+  packages_file = NULL;
+  free(udp_receive_buffer);
+  udp_receive_buffer = NULL;
+  if (builtin_lib_ != NULL) {
+    Dart_DeletePersistentHandle(builtin_lib_);
+  }
+  delete app_snapshot_;
+  app_snapshot_ = NULL;
+}
+
+}  // namespace bin
+}  // namespace dart