1 files changed, 107 insertions, 0 deletions
diff --git a/mozglue/misc/RuntimeExceptionModule.cpp b/mozglue/misc/RuntimeExceptionModule.cpp
new file mode 100644
index 0000000000..b8a41cd7cf
--- /dev/null
+++ b/mozglue/misc/RuntimeExceptionModule.cpp
@@ -0,0 +1,107 @@
+/* -*- 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 "RuntimeExceptionModule.h"
+
+#include <cstdint>
+
+#include "mozilla/ProcessType.h"
+
+#if defined(XP_WIN)
+#  include <windows.h>
+#  if defined(__MINGW32__) || defined(__MINGW64__)
+// Add missing constants and types for mingw builds
+typedef HANDLE HREPORT;
+#    define WerReportSubmit(a, b, c, d) \
+      WerReportSubmit(a, b, c, WER_SUBMIT_RESULT* pSubmitResult)
+#    define WER_MAX_PREFERRED_MODULES_BUFFER 256
+#  endif               // defined(__MINGW32__) || defined(__MINGW64__)
+#  include <werapi.h>  // For WerRegisterRuntimeExceptionModule()
+#  if defined(__MINGW32__) || defined(__MINGW64__)
+#    undef WerReportSubmit
+#  endif  // defined(__MINGW32__) || defined(__MINGW64__)
+#  include <stdlib.h>
+
+#  include "mozilla/Unused.h"
+
+using mozilla::Unused;
+#endif
+
+namespace CrashReporter {
+
+#ifdef XP_WIN
+
+const static size_t kModulePathLength = MAX_PATH + 1;
+static wchar_t sModulePath[kModulePathLength];
+
+bool GetRuntimeExceptionModulePath(wchar_t* aPath, const size_t aLength) {
+  const wchar_t* kModuleName = L"mozwer.dll";
+  DWORD res = ::GetModuleFileNameW(nullptr, aPath, aLength);
+  if ((res > 0) && (res != aLength)) {
+    wchar_t* last_backslash = wcsrchr(aPath, L'\\');
+    if (last_backslash) {
+      *(last_backslash + 1) = L'\0';
+      if (wcscat_s(aPath, aLength, kModuleName) == 0) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+#endif  // XP_WIN
+
+void RegisterRuntimeExceptionModule() {
+#ifdef XP_WIN
+#  if defined(DEBUG)
+  // In debug builds, disable the crash reporter by default, and allow to
+  // enable it with the MOZ_CRASHREPORTER environment variable.
+  const char* envvar = getenv("MOZ_CRASHREPORTER");
+  if (!envvar || !*envvar) {
+    return;
+  }
+#  else
+  // In other builds, enable the crash reporter by default, and allow
+  // disabling it with the MOZ_CRASHREPORTER_DISABLE environment variable.
+  const char* envvar = getenv("MOZ_CRASHREPORTER_DISABLE");
+  if (envvar && *envvar) {
+    return;
+  }
+#  endif
+
+  // If sModulePath is set we have already registerd the module.
+  if (*sModulePath) {
+    return;
+  }
+
+  // If we fail to get the path just return.
+  if (!GetRuntimeExceptionModulePath(sModulePath, kModulePathLength)) {
+    return;
+  }
+
+  if (FAILED(::WerRegisterRuntimeExceptionModule(
+          sModulePath,
+          reinterpret_cast<PVOID>(mozilla::GetGeckoProcessType())))) {
+    // The registration failed null out sModulePath to record this.
+    *sModulePath = L'\0';
+    return;
+  }
+#endif  // XP_WIN
+}
+
+void UnregisterRuntimeExceptionModule() {
+#ifdef XP_WIN
+  // If sModulePath is set then we have registered the module.
+  if (*sModulePath) {
+    Unused << ::WerUnregisterRuntimeExceptionModule(
+        sModulePath, reinterpret_cast<PVOID>(mozilla::GetGeckoProcessType()));
+    *sModulePath = L'\0';
+  }
+#endif  // XP_WIN
+}
+
+}  // namespace CrashReporter