1 files changed, 78 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/runtime/ExceptionScope.h b/Source/JavaScriptCore/runtime/ExceptionScope.h
new file mode 100644
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+++ b/Source/JavaScriptCore/runtime/ExceptionScope.h
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+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "VM.h"
+
+namespace JSC {
+    
+class Exception;
+    
+#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
+    
+class ExceptionScope {
+public:
+    VM& vm() const { return m_vm; }
+    unsigned recursionDepth() const { return m_recursionDepth; }
+    Exception* exception() { return m_vm.exception(); }
+    
+protected:
+    ExceptionScope(VM&, ExceptionEventLocation);
+    ExceptionScope(const ExceptionScope&) = delete;
+    ExceptionScope(ExceptionScope&&) = default;
+    ~ExceptionScope();
+
+    VM& m_vm;
+    ExceptionScope* m_previousScope;
+    ExceptionEventLocation m_location;
+    unsigned m_recursionDepth;
+};
+    
+#else // not ENABLE(EXCEPTION_SCOPE_VERIFICATION)
+    
+class ExceptionScope {
+public:
+    ALWAYS_INLINE VM& vm() const { return m_vm; }
+    ALWAYS_INLINE Exception* exception() { return m_vm.exception(); }
+
+protected:
+    ALWAYS_INLINE ExceptionScope(VM& vm)
+        : m_vm(vm)
+    { }
+    ExceptionScope(const ExceptionScope&) = delete;
+    ExceptionScope(ExceptionScope&&) = default;
+
+    VM& m_vm;
+};
+    
+#endif // ENABLE(EXCEPTION_SCOPE_VERIFICATION)
+
+#define RETURN_IF_EXCEPTION(scope__, value__) do { \
+        if (UNLIKELY((scope__).exception())) \
+            return value__; \
+    } while (false)
+
+} // namespace JSC