src/third_party/mozjs/js/src/yarr/YarrJIT.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 *
 * Copyright (C) 2009 Apple Inc. All rights reserved.
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 * 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
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 *
 * 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
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 */

#ifndef yarr_YarrJIT_h
#define yarr_YarrJIT_h

#include "assembler/wtf/Platform.h"

#if ENABLE_YARR_JIT

#include "assembler/assembler/MacroAssembler.h"

#include "MatchResult.h"
#include "Yarr.h"
#include "YarrPattern.h"

#if WTF_CPU_X86 && !WTF_COMPILER_MSVC && !WTF_COMPILER_SUNCC
#define YARR_CALL __attribute__ ((regparm (3)))
#else
#define YARR_CALL
#endif

#if JS_TRACE_LOGGING
#include "TraceLogging.h"
#endif

namespace JSC {

class JSGlobalData;
class ExecutablePool;

namespace Yarr {

class YarrCodeBlock {
#if defined(WTF_CPU_X86_64) && !defined(_WIN64)
    typedef MatchResult JITMatchResult;
#else
    typedef EncodedMatchResult JITMatchResult;
#endif

    typedef JITMatchResult (*YarrJITCode8)(const LChar* input, unsigned start, unsigned length, int* output) YARR_CALL;
    typedef JITMatchResult (*YarrJITCode16)(const UChar* input, unsigned start, unsigned length, int* output) YARR_CALL;
    typedef JITMatchResult (*YarrJITCodeMatchOnly8)(const LChar* input, unsigned start, unsigned length) YARR_CALL;
    typedef JITMatchResult (*YarrJITCodeMatchOnly16)(const UChar* input, unsigned start, unsigned length) YARR_CALL;

public:
    YarrCodeBlock()
        : m_needFallBack(false)
    {
    }

    ~YarrCodeBlock()
    {
    }

    void setFallBack(bool fallback) { m_needFallBack = fallback; }
    bool isFallBack() { return m_needFallBack; }

#ifdef YARR_8BIT_CHAR_SUPPORT
    bool has8BitCode() const { return m_ref8.size(); }
    void set8BitCode(MacroAssemblerCodeRef ref) { m_ref8 = ref; }
    bool has8BitCodeMatchOnly() const { return m_matchOnly8.size(); }
    void set8BitCodeMatchOnly(MacroAssemblerCodeRef matchOnly) { m_matchOnly8 = matchOnly; }
#endif

    bool has16BitCode() const { return m_ref16.size(); }
    void set16BitCode(MacroAssemblerCodeRef ref) { m_ref16 = ref; }

    bool has16BitCodeMatchOnly() const { return m_matchOnly16.size(); }
    void set16BitCodeMatchOnly(MacroAssemblerCodeRef matchOnly) { m_matchOnly16 = matchOnly; }

#if YARR_8BIT_CHAR_SUPPORT
    MatchResult execute(const LChar* input, unsigned start, unsigned length, int* output)
    {
        ASSERT(has8BitCode());

#if JS_TRACE_LOGGING
        js::AutoTraceLog logger(js::TraceLogging::defaultLogger(),
                                js::TraceLogging::YARR_JIT_START,
                                js::TraceLogging::YARR_JIT_STOP);
#endif

        return MatchResult(reinterpret_cast<YarrJITCode8>(m_ref8.code().executableAddress())(input, start, length, output));
    }

    MatchResult execute(const LChar* input, unsigned start, unsigned length)
    {
        ASSERT(has8BitCodeMatchOnly());

#if JS_TRACE_LOGGING
        js::AutoTraceLog logger(js::TraceLogging::defaultLogger(),
                                js::TraceLogging::YARR_JIT_START,
                                js::TraceLogging::YARR_JIT_STOP);
#endif

        return MatchResult(reinterpret_cast<YarrJITCodeMatchOnly8>(m_matchOnly8.code().executableAddress())(input, start, length));
    }
#endif

    MatchResult execute(const UChar* input, unsigned start, unsigned length, int* output)
    {
        ASSERT(has16BitCode());

#if JS_TRACE_LOGGING
        js::AutoTraceLog logger(js::TraceLogging::defaultLogger(),
                                js::TraceLogging::YARR_JIT_START,
                                js::TraceLogging::YARR_JIT_STOP);
#endif

        YarrJITCode16 fn = JS_FUNC_TO_DATA_PTR(YarrJITCode16, m_ref16.code().executableAddress());
        return MatchResult(fn(input, start, length, output));
    }

    MatchResult execute(const UChar* input, unsigned start, unsigned length)
    {
        ASSERT(has16BitCodeMatchOnly());

#if JS_TRACE_LOGGING
        js::AutoTraceLog logger(js::TraceLogging::defaultLogger(),
                                js::TraceLogging::YARR_JIT_START,
                                js::TraceLogging::YARR_JIT_STOP);
#endif

        YarrJITCodeMatchOnly16 fn = JS_FUNC_TO_DATA_PTR(YarrJITCodeMatchOnly16, m_matchOnly16.code().executableAddress());
        return MatchResult(fn(input, start, length));
    }

#if ENABLE_REGEXP_TRACING
    void *getAddr() { return m_ref.code().executableAddress(); }
#endif

    void clear()
    {
#ifdef YARR_8BIT_CHAR_SUPPORT
        m_ref8 = MacroAssemblerCodeRef();
        m_matchOnly8 = MacroAssemblerCodeRef();
#endif

        m_ref16 = MacroAssemblerCodeRef();
        m_matchOnly16 = MacroAssemblerCodeRef();
        m_needFallBack = false;
    }

    void release() {
#ifdef YARR_8BIT_CHAR_SUPPORT
        m_ref8.release();
        m_matchOnly8.release();
#endif

        m_ref16.release();
        m_matchOnly16.release();
    }

private:
#ifdef YARR_8BIT_CHAR_SUPPORT
    MacroAssemblerCodeRef m_ref8;
    MacroAssemblerCodeRef m_matchOnly8;
#endif

    MacroAssemblerCodeRef m_ref16;
    MacroAssemblerCodeRef m_matchOnly16;
    bool m_needFallBack;
};

enum YarrJITCompileMode {
    MatchOnly,
    IncludeSubpatterns
};
void jitCompile(YarrPattern&, YarrCharSize, JSGlobalData*, YarrCodeBlock& jitObject, YarrJITCompileMode = IncludeSubpatterns);

} } // namespace JSC::Yarr

#endif

#endif /* yarr_YarrJIT_h */