Cleanup app snapshots on isolate/vm exit.

runtime/bin/file_linux.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 "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include "bin/file.h"
 
 #include <errno.h>         // NOLINT
@@ skipping 61 matching lines @@
 intptr_t File::GetFD() {
   return handle_->fd();
 }
 
 
 bool File::IsClosed() {
   return handle_->fd() == kClosedFd;
 }
 
 
-void* File::Map(MapType type, int64_t position, int64_t length) {
+MappedMemory* File::Map(MapType type, int64_t position, int64_t length) {
   ASSERT(handle_->fd() >= 0);
   int prot = PROT_NONE;
   switch (type) {
     case kReadOnly:
       prot = PROT_READ;
       break;
     case kReadExecute:
       prot = PROT_READ | PROT_EXEC;
       break;
     default:
       return NULL;
   }
   void* addr = mmap(NULL, length, prot, MAP_PRIVATE, handle_->fd(), position);
   if (addr == MAP_FAILED) {
     return NULL;
   }
-  return addr;
+  return new MappedMemory(addr, length);
 }
 
 
+void MappedMemory::Unmap() {
+  int result = munmap(address_, size_);
+  ASSERT(result == 0);
+  address_ = 0;
+  size_ = 0;
+}
+
+
 int64_t File::Read(void* buffer, int64_t num_bytes) {
   ASSERT(handle_->fd() >= 0);
   return TEMP_FAILURE_RETRY(read(handle_->fd(), buffer, num_bytes));
 }
 
 
 int64_t File::Write(const void* buffer, int64_t num_bytes) {
   ASSERT(handle_->fd() >= 0);
   return TEMP_FAILURE_RETRY(write(handle_->fd(), buffer, num_bytes));
 }
@@ skipping 468 matching lines @@
   return ((file_1_info.st_ino == file_2_info.st_ino) &&
           (file_1_info.st_dev == file_2_info.st_dev))
              ? File::kIdentical
              : File::kDifferent;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)