JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / dfg / DFGOSRExitCompiler.h

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+/*
+ * Copyright (C) 2011 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 DFGOSRExitCompiler_h
+#define DFGOSRExitCompiler_h
+
+#include <wtf/Platform.h>
+
+#if ENABLE(DFG_JIT)
+
+#include "DFGAssemblyHelpers.h"
+#include "DFGOSRExit.h"
+#include "DFGOperations.h"
+
+namespace JSC {
+
+class ExecState;
+
+namespace DFG {
+
+class OSRExitCompiler {
+public:
+    OSRExitCompiler(AssemblyHelpers& jit)
+        : m_jit(jit)
+    {
+    }
+    
+    void compileExit(const OSRExit&, SpeculationRecovery*);
+
+private:
+#if !ASSERT_DISABLED
+    static unsigned badIndex() { return static_cast<unsigned>(-1); };
+#endif
+    
+    void initializePoisoned(unsigned size)
+    {
+#if ASSERT_DISABLED
+        m_poisonScratchIndices.resize(size);
+#else
+        m_poisonScratchIndices.fill(badIndex(), size);
+#endif
+    }
+    
+    unsigned poisonIndex(unsigned index)
+    {
+        unsigned result = m_poisonScratchIndices[index];
+        ASSERT(result != badIndex());
+        return result;
+    }
+    
+    void handleExitCounts(const OSRExit&);
+    
+    AssemblyHelpers& m_jit;
+    Vector<unsigned> m_poisonScratchIndices;
+};
+
+extern "C" {
+void DFG_OPERATION compileOSRExit(ExecState*);
+}
+
+} } // namespace JSC::DFG
+
+#endif // ENABLE(DFG_JIT)
+
+#endif // DFGOSRExitCompiler_h