webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 60 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/b3/B3Origin.h b/Source/JavaScriptCore/b3/B3Origin.h
new file mode 100644
index 000000000..47fd10fd9
--- /dev/null
+++ b/Source/JavaScriptCore/b3/B3Origin.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2015 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
+
+#if ENABLE(B3_JIT)
+
+#include <wtf/PrintStream.h>
+
+namespace JSC { namespace B3 {
+
+// Whoever generates B3IR can choose to put origins on values. When you do this, B3 will be able to
+// account, down to the machine code, which instruction corresponds to which origin. B3
+// transformations must preserve Origins carefully. It's an error to write a transformation that
+// either drops Origins or lies about them.
+class Origin {
+public:
+    explicit Origin(const void* data = nullptr)
+        : m_data(data)
+    {
+    }
+
+    explicit operator bool() const { return !!m_data; }
+
+    const void* data() const { return m_data; }
+
+    bool operator==(const Origin& other) const { return m_data == other.m_data; }
+
+    // You should avoid using this. Use OriginDump instead.
+    void dump(PrintStream&) const;
+    
+private:
+    const void* m_data;
+};
+
+} } // namespace JSC::B3
+
+#endif // ENABLE(B3_JIT)