1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/jit/AutoJitContextAlloc.h b/js/src/jit/AutoJitContextAlloc.h
new file mode 100644
index 0000000000..fc0ca8a64d
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+++ b/js/src/jit/AutoJitContextAlloc.h
@@ -0,0 +1,37 @@
+/* -*- 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/. */
+
+#ifndef jit_AutoJitContextAlloc_h
+#define jit_AutoJitContextAlloc_h
+
+#include "mozilla/Assertions.h"
+
+#include "ds/LifoAlloc.h"
+#include "jit/JitAllocPolicy.h"
+#include "jit/JitContext.h"
+
+namespace js::jit {
+
+class AutoJitContextAlloc {
+  TempAllocator tempAlloc_;
+  JitContext* jcx_;
+  TempAllocator* prevAlloc_;
+
+ public:
+  explicit AutoJitContextAlloc(LifoAlloc* lifoAlloc)
+      : tempAlloc_(lifoAlloc), jcx_(GetJitContext()), prevAlloc_(jcx_->temp) {
+    jcx_->temp = &tempAlloc_;
+  }
+
+  ~AutoJitContextAlloc() {
+    MOZ_ASSERT(jcx_->temp == &tempAlloc_);
+    jcx_->temp = prevAlloc_;
+  }
+};
+
+}  // namespace js::jit
+
+#endif /* jit_AutoJitContextAlloc_h */