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-rw-r--r--devtools/shared/heapsnapshot/AutoMemMap.cpp67
1 files changed, 67 insertions, 0 deletions
diff --git a/devtools/shared/heapsnapshot/AutoMemMap.cpp b/devtools/shared/heapsnapshot/AutoMemMap.cpp
new file mode 100644
index 0000000000..8a7c89b4bf
--- /dev/null
+++ b/devtools/shared/heapsnapshot/AutoMemMap.cpp
@@ -0,0 +1,67 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/devtools/AutoMemMap.h"
+
+#include "mozilla/Unused.h"
+#include "nsDebug.h"
+
+namespace mozilla {
+namespace devtools {
+
+AutoMemMap::~AutoMemMap() {
+ if (addr) {
+ Unused << NS_WARN_IF(PR_MemUnmap(addr, size()) != PR_SUCCESS);
+ addr = nullptr;
+ }
+
+ if (fileMap) {
+ Unused << NS_WARN_IF(PR_CloseFileMap(fileMap) != PR_SUCCESS);
+ fileMap = nullptr;
+ }
+
+ if (fd) {
+ Unused << NS_WARN_IF(PR_Close(fd) != PR_SUCCESS);
+ fd = nullptr;
+ }
+}
+
+nsresult AutoMemMap::init(nsIFile* file, int flags, int mode,
+ PRFileMapProtect prot) {
+ MOZ_ASSERT(!fd);
+ MOZ_ASSERT(!fileMap);
+ MOZ_ASSERT(!addr);
+
+ nsresult rv;
+ int64_t inputFileSize;
+ rv = file->GetFileSize(&inputFileSize);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ // Check if the file is too big to memmap.
+ if (inputFileSize > int64_t(UINT32_MAX)) {
+ return NS_ERROR_INVALID_ARG;
+ }
+ fileSize = uint32_t(inputFileSize);
+
+ rv = file->OpenNSPRFileDesc(flags, mode, &fd);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ if (!fd) return NS_ERROR_UNEXPECTED;
+
+ fileMap = PR_CreateFileMap(fd, inputFileSize, prot);
+ if (!fileMap) return NS_ERROR_UNEXPECTED;
+
+ addr = PR_MemMap(fileMap, 0, fileSize);
+ if (!addr) return NS_ERROR_UNEXPECTED;
+
+ return NS_OK;
+}
+
+} // namespace devtools
+} // namespace mozilla