JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / bytecode / CallLinkInfo.h

diff --git a/bytecode/CallLinkInfo.h b/bytecode/CallLinkInfo.h
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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. 
+ */
+
+#ifndef CallLinkInfo_h
+#define CallLinkInfo_h
+
+#include "CodeLocation.h"
+#include "JITWriteBarrier.h"
+#include "JSFunction.h"
+#include "Opcode.h"
+#include "WriteBarrier.h"
+#include <wtf/Platform.h>
+#include <wtf/SentinelLinkedList.h>
+
+namespace JSC {
+
+#if ENABLE(JIT)
+
+class RepatchBuffer;
+
+struct CallLinkInfo : public BasicRawSentinelNode<CallLinkInfo> {
+    enum CallType { None, Call, CallVarargs, Construct };
+    static CallType callTypeFor(OpcodeID opcodeID)
+    {
+        if (opcodeID == op_call || opcodeID == op_call_eval)
+            return Call;
+        if (opcodeID == op_construct)
+            return Construct;
+        ASSERT(opcodeID == op_call_varargs);
+        return CallVarargs;
+    }
+        
+    CallLinkInfo()
+        : hasSeenShouldRepatch(false)
+        , isDFG(false)
+        , callType(None)
+    {
+    }
+        
+    ~CallLinkInfo()
+    {
+        if (isOnList())
+            remove();
+    }
+
+    CodeLocationLabel callReturnLocation; // it's a near call in the old JIT, or a normal call in DFG
+    CodeLocationDataLabelPtr hotPathBegin;
+    CodeLocationNearCall hotPathOther;
+    JITWriteBarrier<JSFunction> callee;
+    WriteBarrier<JSFunction> lastSeenCallee;
+    bool hasSeenShouldRepatch : 1;
+    bool isDFG : 1;
+    CallType callType : 6;
+    unsigned bytecodeIndex;
+
+    bool isLinked() { return callee; }
+    void unlink(JSGlobalData&, RepatchBuffer&);
+
+    bool seenOnce()
+    {
+        return hasSeenShouldRepatch;
+    }
+
+    void setSeen()
+    {
+        hasSeenShouldRepatch = true;
+    }
+};
+
+inline void* getCallLinkInfoReturnLocation(CallLinkInfo* callLinkInfo)
+{
+    return callLinkInfo->callReturnLocation.executableAddress();
+}
+
+inline unsigned getCallLinkInfoBytecodeIndex(CallLinkInfo* callLinkInfo)
+{
+    return callLinkInfo->bytecodeIndex;
+}
+#endif // ENABLE(JIT)
+
+} // namespace JSC
+
+#endif // CallLinkInfo_h