Opcode.h 3.85 KB
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/*
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 * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
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 * Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
 *
 * 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.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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.
 */

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#ifndef Opcode_h
#define Opcode_h
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#include "OpcodeDefinitions.h"

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#include <algorithm>
#include <string.h>

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#include <wtf/Assertions.h>

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namespace JSC {
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    #define OPCODE_ID_ENUM(opcode, length) opcode,
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        typedef enum { FOR_EACH_OPCODE_ID(OPCODE_ID_ENUM) } OpcodeID;
    #undef OPCODE_ID_ENUM
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    const int numOpcodeIDs = op_end + 1;
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    #define OPCODE_ID_LENGTHS(id, length) const int id##_length = length;
         FOR_EACH_OPCODE_ID(OPCODE_ID_LENGTHS);
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    #undef OPCODE_ID_LENGTHS
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    #define OPCODE_LENGTH(opcode) opcode##_length

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    #define OPCODE_ID_LENGTH_MAP(opcode, length) length,
        const int opcodeLengths[numOpcodeIDs] = { FOR_EACH_OPCODE_ID(OPCODE_ID_LENGTH_MAP) };
    #undef OPCODE_ID_LENGTH_MAP

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    #define VERIFY_OPCODE_ID(id, size) COMPILE_ASSERT(id <= op_end, ASSERT_THAT_JS_OPCODE_IDS_ARE_VALID);
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        FOR_EACH_OPCODE_ID(VERIFY_OPCODE_ID);
    #undef VERIFY_OPCODE_ID
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#if ENABLE(COMPUTED_GOTO_CLASSIC_INTERPRETER) || ENABLE(LLINT)
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#if COMPILER(RVCT) || COMPILER(INTEL)
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    typedef void* Opcode;
#else
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    typedef const void* Opcode;
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#endif
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#else
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    typedef OpcodeID Opcode;
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#endif

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#define PADDING_STRING "                                "
#define PADDING_STRING_LENGTH static_cast<unsigned>(strlen(PADDING_STRING))
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    extern const char* const opcodeNames[];
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    inline const char* padOpcodeName(OpcodeID op, unsigned width)
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    {
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        unsigned pad = width - strlen(opcodeNames[op]);
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        pad = std::min(pad, PADDING_STRING_LENGTH);
        return PADDING_STRING + PADDING_STRING_LENGTH - pad;
    }
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#undef PADDING_STRING_LENGTH
#undef PADDING_STRING
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#if ENABLE(OPCODE_STATS)
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    struct OpcodeStats {
        OpcodeStats();
        ~OpcodeStats();
        static long long opcodeCounts[numOpcodeIDs];
        static long long opcodePairCounts[numOpcodeIDs][numOpcodeIDs];
        static int lastOpcode;
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        static void recordInstruction(int opcode);
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        static void resetLastInstruction();
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    };

#endif

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    inline size_t opcodeLength(OpcodeID opcode)
    {
        switch (opcode) {
#define OPCODE_ID_LENGTHS(id, length) case id: return OPCODE_LENGTH(id);
             FOR_EACH_OPCODE_ID(OPCODE_ID_LENGTHS)
#undef OPCODE_ID_LENGTHS
        }
        ASSERT_NOT_REACHED();
        return 0;
    }

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} // namespace JSC
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#endif // Opcode_h