JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / bytecode / MethodCallLinkStatus.cpp

diff --git a/bytecode/MethodCallLinkStatus.cpp b/bytecode/MethodCallLinkStatus.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 "MethodCallLinkStatus.h"
+
+#include "CodeBlock.h"
+
+namespace JSC {
+
+MethodCallLinkStatus MethodCallLinkStatus::computeFor(CodeBlock* profiledBlock, unsigned bytecodeIndex)
+{
+    UNUSED_PARAM(profiledBlock);
+    UNUSED_PARAM(bytecodeIndex);
+#if ENABLE(JIT) && ENABLE(VALUE_PROFILER)
+    // NOTE: This does not have an LLInt fall-back because LLInt does not do any method
+    // call link caching.
+    if (!profiledBlock->numberOfMethodCallLinkInfos())
+        return MethodCallLinkStatus();
+    
+    MethodCallLinkInfo& methodCall = profiledBlock->getMethodCallLinkInfo(bytecodeIndex);
+    
+    if (!methodCall.seen || !methodCall.cachedStructure)
+        return MethodCallLinkStatus();
+    
+    if (methodCall.cachedPrototype.get() == profiledBlock->globalObject()->methodCallDummy()) {
+        return MethodCallLinkStatus(
+            methodCall.cachedStructure.get(),
+            0,
+            methodCall.cachedFunction.get(),
+            0);
+    }
+    
+    return MethodCallLinkStatus(
+        methodCall.cachedStructure.get(),
+        methodCall.cachedPrototypeStructure.get(),
+        methodCall.cachedFunction.get(),
+        methodCall.cachedPrototype.get());
+#else // ENABLE(JIT)
+    return MethodCallLinkStatus();
+#endif // ENABLE(JIT)
+}
+
+} // namespace JSC