1 files changed, 66 insertions, 0 deletions
diff --git a/mfbt/Assertions.cpp b/mfbt/Assertions.cpp
new file mode 100644
index 000000000..62630842d
--- /dev/null
+++ b/mfbt/Assertions.cpp
@@ -0,0 +1,66 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/Assertions.h"
+#include "mozilla/Atomics.h"
+
+#include <stdarg.h>
+
+MOZ_BEGIN_EXTERN_C
+
+/*
+ * The crash reason is defined as a global variable here rather than in the
+ * crash reporter itself to make it available to all code, even libraries like
+ * JS that don't link with the crash reporter directly. This value will only
+ * be consumed if the crash reporter is used by the target application.
+ */
+MFBT_DATA const char* gMozCrashReason = nullptr;
+
+#ifndef DEBUG
+MFBT_API MOZ_COLD MOZ_NORETURN MOZ_NEVER_INLINE void
+MOZ_CrashOOL(int aLine, const char* aReason)
+#else
+MFBT_API MOZ_COLD MOZ_NORETURN MOZ_NEVER_INLINE void
+MOZ_CrashOOL(const char* aFilename, int aLine, const char* aReason)
+#endif
+{
+#ifdef DEBUG
+  MOZ_ReportCrash(aReason, aFilename, aLine);
+#endif
+  MOZ_CRASH_ANNOTATE(aReason);
+  MOZ_REALLY_CRASH(aLine);
+}
+
+static char sPrintfCrashReason[sPrintfCrashReasonSize] = {};
+static mozilla::Atomic<bool> sCrashing(false);
+
+#ifndef DEBUG
+MFBT_API MOZ_COLD MOZ_NORETURN MOZ_NEVER_INLINE MOZ_FORMAT_PRINTF(2, 3) void
+MOZ_CrashPrintf(int aLine, const char* aFormat, ...)
+#else
+MFBT_API MOZ_COLD MOZ_NORETURN MOZ_NEVER_INLINE MOZ_FORMAT_PRINTF(3, 4) void
+MOZ_CrashPrintf(const char* aFilename, int aLine, const char* aFormat, ...)
+#endif
+{
+  if (!sCrashing.compareExchange(false, true)) {
+    // In the unlikely event of a race condition, skip
+    // setting the crash reason and just crash safely.
+    MOZ_REALLY_CRASH(aLine);
+  }
+  va_list aArgs;
+  va_start(aArgs, aFormat);
+  int ret = vsnprintf(sPrintfCrashReason, sPrintfCrashReasonSize,
+                      aFormat, aArgs);
+  va_end(aArgs);
+  MOZ_RELEASE_ASSERT(ret >= 0 && size_t(ret) < sPrintfCrashReasonSize,
+    "Could not write the explanation string to the supplied buffer!");
+#ifdef DEBUG
+  MOZ_ReportCrash(sPrintfCrashReason, aFilename, aLine);
+#endif
+  MOZ_CRASH_ANNOTATE(sPrintfCrashReason);
+  MOZ_REALLY_CRASH(aLine);
+}
+
+MOZ_END_EXTERN_C