JavaScriptCore-1218.tar.gz

[apple/javascriptcore.git] / jit / JumpReplacementWatchpoint.cpp

diff --git a/jit/JumpReplacementWatchpoint.cpp b/jit/JumpReplacementWatchpoint.cpp
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+/*
+ * Copyright (C) 2012 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. 
+ */
+
+#include "config.h"
+#include "JumpReplacementWatchpoint.h"
+
+#if ENABLE(JIT)
+
+#include "LinkBuffer.h"
+#include "Options.h"
+
+namespace JSC {
+
+void JumpReplacementWatchpoint::correctLabels(LinkBuffer& linkBuffer)
+{
+    MacroAssembler::Label label;
+    label.m_label.m_offset = m_source;
+    m_source = bitwise_cast<uintptr_t>(linkBuffer.locationOf(label).dataLocation());
+    label.m_label.m_offset = m_destination;
+    m_destination = bitwise_cast<uintptr_t>(linkBuffer.locationOf(label).dataLocation());
+}
+
+void JumpReplacementWatchpoint::fireInternal()
+{
+    void* source = bitwise_cast<void*>(m_source);
+    void* destination = bitwise_cast<void*>(m_destination);
+    if (Options::showDisassembly())
+        dataLogF("Firing jump replacement watchpoint from %p, to %p.\n", source, destination);
+    MacroAssembler::replaceWithJump(CodeLocationLabel(source), CodeLocationLabel(destination));
+    if (isOnList())
+        remove();
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)
+