weex_core/Source/include/JavaScriptCore/domjit/DOMJITPatchpoint.h

/*
 * Copyright (C) 2016 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *    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
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 */

#pragma once

#if ENABLE(JIT)

#include "CCallHelpers.h"
#include "RegisterSet.h"

namespace JSC { namespace DOMJIT {

class PatchpointParams;

typedef CCallHelpers::JumpList PatchpointGeneratorFunction(CCallHelpers&, PatchpointParams&);
typedef SharedTask<PatchpointGeneratorFunction> PatchpointGenerator;

// DOMJIT patchpoint is the way to inject an opaque code generator into DFG and FTL.
// While B3::Patchpoint is self-contained about its compilation information,
// DOMJIT::Patchpoint depends on which DFG Node invokes. For example, CheckDOM will
// link returned failureCases to BadType OSRExit, but this information is offered
// from CheckDOM DFG Node, not from this patchpoint. This patchpoint mainly focuses
// on injecting a snippet generator that can tell register usage and can be used
// in both DFG and FTL.
class Patchpoint : public ThreadSafeRefCounted<Patchpoint> {
public:
    static Ref<Patchpoint> create()
    {
        return adoptRef(*new Patchpoint());
    }

    template<typename Functor>
    void setGenerator(const Functor& functor)
    {
        m_generator = createSharedTask<PatchpointGeneratorFunction>(functor);
    }

    RefPtr<PatchpointGenerator> generator() const { return m_generator; }

    uint8_t numGPScratchRegisters { 0 };
    uint8_t numFPScratchRegisters { 0 };

protected:
    Patchpoint() = default;

private:
    RefPtr<PatchpointGenerator> m_generator;
};

} }

#endif