1 files changed, 63 insertions, 0 deletions
diff --git a/js/xpconnect/src/XPCDebug.cpp b/js/xpconnect/src/XPCDebug.cpp
new file mode 100644
index 000000000..f8500ba10
--- /dev/null
+++ b/js/xpconnect/src/XPCDebug.cpp
@@ -0,0 +1,63 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim: set ts=8 sts=4 et sw=4 tw=99: */
+/* 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 "xpcprivate.h"
+#include "jsprf.h"
+#include "nsThreadUtils.h"
+#include "nsContentUtils.h"
+
+#include "mozilla/Sprintf.h"
+
+#ifdef XP_WIN
+#include <windows.h>
+#endif
+
+static void DebugDump(const char* fmt, ...)
+{
+  char buffer[2048];
+  va_list ap;
+  va_start(ap, fmt);
+#ifdef XPWIN
+  _vsnprintf(buffer, sizeof(buffer), fmt, ap);
+  buffer[sizeof(buffer)-1] = '\0';
+#else
+  VsprintfLiteral(buffer, fmt, ap);
+#endif
+  va_end(ap);
+#ifdef XP_WIN
+  if (IsDebuggerPresent()) {
+    OutputDebugStringA(buffer);
+  }
+#endif
+  printf("%s", buffer);
+}
+
+bool
+xpc_DumpJSStack(bool showArgs, bool showLocals, bool showThisProps)
+{
+    JSContext* cx = nsContentUtils::GetCurrentJSContextForThread();
+    if (!cx) {
+        printf("there is no JSContext on the stack!\n");
+    } else if (char* buf = xpc_PrintJSStack(cx, showArgs, showLocals, showThisProps)) {
+        DebugDump("%s\n", buf);
+        JS_smprintf_free(buf);
+    }
+    return true;
+}
+
+char*
+xpc_PrintJSStack(JSContext* cx, bool showArgs, bool showLocals,
+                 bool showThisProps)
+{
+    JS::AutoSaveExceptionState state(cx);
+
+    char* buf = JS::FormatStackDump(cx, nullptr, showArgs, showLocals, showThisProps);
+    if (!buf)
+        DebugDump("%s", "Failed to format JavaScript stack for dump\n");
+
+    state.restore();
+    return buf;
+}