JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / ftl / FTLForOSREntryJITCode.h

diff --git a/ftl/FTLForOSREntryJITCode.h b/ftl/FTLForOSREntryJITCode.h
new file mode 100644 (file)
index 0000000..44af8f9
--- /dev/null
+++ b/ftl/FTLForOSREntryJITCode.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2013 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 FTLForOSREntryJITCode_h
+#define FTLForOSREntryJITCode_h
+
+#if ENABLE(FTL_JIT)
+
+#include "FTLJITCode.h"
+
+namespace JSC { namespace FTL {
+
+// OSR entry into the FTL has a number of quirks:
+//
+// - OSR entry only happens through special OSR entry compilations. They have their
+//   own CodeBlock and their own JITCode.
+//
+// - We only OSR enter in loop headers that have a null inline call frame.
+//
+// - Each OSR entry compilation allows entry through only one bytecode index.
+
+class ForOSREntryJITCode : public FTL::JITCode {
+public:
+    ForOSREntryJITCode();
+    ~ForOSREntryJITCode();
+    
+    void initializeEntryBuffer(VM&, unsigned numCalleeRegisters);
+    ScratchBuffer* entryBuffer() const { return m_entryBuffer; }
+    
+    void setBytecodeIndex(unsigned value) { m_bytecodeIndex = value; }
+    unsigned bytecodeIndex() const { return m_bytecodeIndex; }
+    
+    void countEntryFailure() { m_entryFailureCount++; }
+    unsigned entryFailureCount() const { return m_entryFailureCount; }
+    
+    ForOSREntryJITCode* ftlForOSREntry();
+    
+private:
+    ScratchBuffer* m_entryBuffer; // Only for OSR entry code blocks.
+    unsigned m_bytecodeIndex;
+    unsigned m_entryFailureCount;
+};
+
+} } // namespace JSC::FTL
+
+#endif // ENABLE(FLT_JIT)
+
+#endif // FTLForOSREntryJITCode_h
+