1 files changed, 170 insertions, 0 deletions
diff --git a/tools/memory_watcher/dllmain.cc b/tools/memory_watcher/dllmain.cc
new file mode 100644
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+++ b/tools/memory_watcher/dllmain.cc
@@ -0,0 +1,170 @@
+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// The memory_watcher.dll is hooked by simply linking it.  When we get the
+// windows notification that this DLL is loaded, we do a few things:
+//    1) Register a Hot Key.
+//       Only one process can hook the Hot Key, so one will get it, and the
+//       others will silently fail.
+//    2) Create a thread to wait on an event.
+//       Since only one process will get the HotKey, it will be responsible for
+//       notifying all process when it's time to do something.  Each process
+//       will have a thread waiting for communication from the master to dump
+//       the callstacks.
+
+#include <windows.h>
+#include "tools/memory_watcher/memory_watcher.h"
+#include "tools/memory_watcher/hotkey.h"
+
+static wchar_t* kDumpEvent = L"MemWatcher.DumpEvent";
+static MemoryWatcher* g_memory_watcher = NULL;
+static HANDLE g_dump_event = INVALID_HANDLE_VALUE;
+static HANDLE g_quit_event = INVALID_HANDLE_VALUE;
+static HANDLE g_watcher_thread = INVALID_HANDLE_VALUE;
+
+// A HotKey to dump the memory statistics.
+class MemoryWatcherDumpKey : public HotKeyHandler {
+ public:
+  MemoryWatcherDumpKey(UINT modifiers, UINT vkey)
+    : HotKeyHandler(modifiers, vkey) {}
+
+  virtual LRESULT OnHotKey(UINT, WPARAM, LPARAM, BOOL& bHandled) {
+    SetEvent(g_dump_event);
+    return 1;
+  }
+};
+
+// Register ALT-CONTROL-D to Dump Memory stats.
+MemoryWatcherDumpKey hHotKeyHandler(MOD_ALT|MOD_CONTROL, 0x44);
+
+// Creates the global memory watcher.
+void CreateMemoryWatcher() {
+  g_memory_watcher = new MemoryWatcher();
+}
+
+// Deletes the global memory watcher.
+void DeleteMemoryWatcher() {
+  if (g_memory_watcher)
+    delete g_memory_watcher;
+  g_memory_watcher = NULL;
+}
+
+// Thread for watching for key events.
+DWORD WINAPI ThreadMain(LPVOID) {
+  bool stopping = false;
+  HANDLE events[2] =  { g_dump_event, g_quit_event };
+  while (!stopping) {
+    DWORD rv = WaitForMultipleObjects(2, events, FALSE, INFINITE);
+    switch (rv) {
+      case WAIT_OBJECT_0:
+        if (g_memory_watcher) {
+          g_memory_watcher->DumpLeaks();
+          // After dumping, we teardown.
+          ExitProcess(0);
+        }
+        break;
+      case WAIT_OBJECT_0 + 1:
+        stopping = true;
+        break;
+      default:
+        NOTREACHED();
+        break;
+    }
+  }
+  return 0;
+}
+
+// Creates the background thread
+void CreateBackgroundThread() {
+  // Create a named event which can be used to notify
+  // all watched processes.
+  g_dump_event = CreateEvent(0, TRUE, FALSE, kDumpEvent);
+  DCHECK(g_dump_event != NULL);
+
+  // Create a local event which can be used to kill our
+  // background thread.
+  g_quit_event = CreateEvent(0, TRUE, FALSE, NULL);
+  DCHECK(g_quit_event != NULL);
+
+  // Create the background thread.
+  g_watcher_thread = CreateThread(0,
+                                0,
+                                ThreadMain,
+                                0,
+                                0,
+                                0);
+  DCHECK(g_watcher_thread != NULL);
+}
+
+// Tell the background thread to stop.
+void StopBackgroundThread() {
+  // Send notification to our background thread.
+  SetEvent(g_quit_event);
+
+  // Wait for our background thread to die.
+  DWORD rv = WaitForSingleObject(g_watcher_thread, INFINITE);
+  DCHECK(rv == WAIT_OBJECT_0);
+
+  // Cleanup our global handles.
+  CloseHandle(g_quit_event);
+  CloseHandle(g_dump_event);
+  CloseHandle(g_watcher_thread);
+}
+
+bool IsChromeExe() {
+  return GetModuleHandleA("chrome.exe") != NULL;
+}
+
+extern "C" {
+// DllMain is the windows entry point to this DLL.
+// We use the entry point as the mechanism for starting and stopping
+// the MemoryWatcher.
+BOOL WINAPI DllMain(HINSTANCE dll_instance, DWORD reason,
+                              LPVOID reserved) {
+  if (!IsChromeExe())
+    return FALSE;
+
+  switch (reason) {
+    case DLL_PROCESS_ATTACH:
+      CreateMemoryWatcher();
+      CreateBackgroundThread();
+      break;
+    case DLL_PROCESS_DETACH:
+      DeleteMemoryWatcher();
+      StopBackgroundThread();
+      break;
+  }
+  return TRUE;
+}
+
+__declspec(dllexport) void __cdecl SetLogName(char* name) {
+  g_memory_watcher->SetLogName(name);
+}
+
+}  // extern "C"