1 files changed, 60 insertions, 0 deletions
diff --git a/js/src/vm/Exception.cpp b/js/src/vm/Exception.cpp
new file mode 100644
index 0000000000..d169e9e4a1
--- /dev/null
+++ b/js/src/vm/Exception.cpp
@@ -0,0 +1,60 @@
+/* -*- 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 "js/Exception.h"
+
+#include "js/Context.h"  // js::AssertHeapIsIdle
+#include "vm/JSContext.h"
+#include "vm/SavedFrame.h"
+
+using namespace js;
+
+bool JS::StealPendingExceptionStack(JSContext* cx,
+                                    JS::ExceptionStack* exceptionStack) {
+  if (!GetPendingExceptionStack(cx, exceptionStack)) {
+    return false;
+  }
+
+  // "Steal" exception by clearing it.
+  cx->clearPendingException();
+  return true;
+}
+
+bool JS::GetPendingExceptionStack(JSContext* cx,
+                                  JS::ExceptionStack* exceptionStack) {
+  AssertHeapIsIdle();
+  CHECK_THREAD(cx);
+
+  MOZ_ASSERT(exceptionStack);
+  MOZ_ASSERT(cx->isExceptionPending());
+
+  RootedValue exception(cx);
+  if (!cx->getPendingException(&exception)) {
+    return false;
+  }
+
+  RootedObject stack(cx, cx->getPendingExceptionStack());
+  exceptionStack->init(exception, stack);
+  return true;
+}
+
+void JS::SetPendingExceptionStack(JSContext* cx,
+                                  const JS::ExceptionStack& exceptionStack) {
+  AssertHeapIsIdle();
+  CHECK_THREAD(cx);
+
+  // We don't check the compartments of `exception` and `stack` here,
+  // because we're not doing anything with them other than storing
+  // them, and stored exception values can be in an abitrary
+  // compartment while stored stack values are always the unwrapped
+  // object anyway.
+
+  Rooted<SavedFrame*> nstack(cx);
+  if (exceptionStack.stack()) {
+    nstack = &UncheckedUnwrap(exceptionStack.stack())->as<SavedFrame>();
+  }
+  cx->setPendingException(exceptionStack.exception(), nstack);
+}