Source/JavaScriptCore/ftl/FTLInlineCacheSize.cpp

/*
 * Copyright (C) 2013-2015 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. 
 */

#include "config.h"
#include "FTLInlineCacheSize.h"

#if ENABLE(FTL_JIT)

#include "DFGNode.h"
#include "JITInlineCacheGenerator.h"
#include "MacroAssembler.h"

namespace JSC { namespace FTL {

using namespace DFG;

// The default sizes are x86-64-specific, and were found empirically. They have to cover the worst
// possible combination of registers leading to the largest possible encoding of each instruction in
// the IC.
//
// FIXME: The ARM64 sizes are overestimates; if there is any branch compaction then we should be able
// to get away with less. The branch compaction code currently validates the size of the IC before
// doing any compaction, so we need to overestimate and give the uncompacted size. This would be
// relatively easy to fix.
// https://bugs.webkit.org/show_bug.cgi?id=129335

size_t sizeOfGetById()
{
#if CPU(ARM64)
    return 32;
#else
    return 27;
#endif
}

size_t sizeOfPutById()
{
#if CPU(ARM64)
    return 40;
#else
    return 29;
#endif
}

size_t sizeOfCall()
{
#if CPU(ARM64)
    return 60;
#else
    return 60;
#endif
}

size_t sizeOfCallVarargs()
{
#if CPU(ARM64)
    return 332;
#else
    return 275;
#endif
}

size_t sizeOfTailCallVarargs()
{
#if CPU(ARM64)
    return 188 + sizeOfCallVarargs();
#else
    return 151 + sizeOfCallVarargs();
#endif
}

size_t sizeOfCallForwardVarargs()
{
#if CPU(ARM64)
    return 312;
#else
    return 262;
#endif
}

size_t sizeOfTailCallForwardVarargs()
{
#if CPU(ARM64)
    return 188 + sizeOfCallForwardVarargs();
#else
    return 151 + sizeOfCallForwardVarargs();
#endif
}

size_t sizeOfConstructVarargs()
{
    return sizeOfCallVarargs(); // Should be the same size.
}

size_t sizeOfConstructForwardVarargs()
{
    return sizeOfCallForwardVarargs(); // Should be the same size.
}

size_t sizeOfIn()
{
#if CPU(ARM64)
    return 4;
#else
    return 5; 
#endif
}

size_t sizeOfArithMul()
{
#if CPU(ARM64)
#ifdef NDEBUG
    return 180; // ARM64 release.
#else
    return 276; // ARM64 debug.
#endif
#else // CPU(X86_64)
#ifdef NDEBUG
    return 199; // X86_64 release.
#else
    return 286; // X86_64 debug.
#endif
#endif
}

size_t sizeOfArithSub()
{
#if CPU(ARM64)
#ifdef NDEBUG
    return 216; // ARM64 release.
#else
    return 312; // ARM64 debug.
#endif
#else // CPU(X86_64)
#ifdef NDEBUG
    return 223; // X86_64 release.
#else
    return 298; // X86_64 debug.
#endif
#endif
}

size_t sizeOfValueAdd()
{
#if CPU(ARM64)
#ifdef NDEBUG
    return 180; // ARM64 release.
#else
    return 276; // ARM64 debug.
#endif
#else // CPU(X86_64)
#ifdef NDEBUG
    return 199; // X86_64 release.
#else
    return 286; // X86_64 debug.
#endif
#endif
}

#if ENABLE(MASM_PROBE)
size_t sizeOfProbe()
{
    return 132; // Based on ARM64.
}
#endif

size_t sizeOfICFor(Node* node)
{
    switch (node->op()) {
    case GetById:
        return sizeOfGetById();
    case PutById:
        return sizeOfPutById();
    case Call:
    case Construct:
        return sizeOfCall();
    case CallVarargs:
    case TailCallVarargsInlinedCaller:
        return sizeOfCallVarargs();
    case TailCallVarargs:
        return sizeOfTailCallVarargs();
    case CallForwardVarargs:
    case TailCallForwardVarargsInlinedCaller:
        return sizeOfCallForwardVarargs();
    case TailCallForwardVarargs:
        return sizeOfTailCallForwardVarargs();
    case ConstructVarargs:
        return sizeOfConstructVarargs();
    case ConstructForwardVarargs:
        return sizeOfConstructForwardVarargs();
    case In:
        return sizeOfIn();
    default:
        RELEASE_ASSERT_NOT_REACHED();
    }
}

} } // namespace JSC::FTL

#endif // ENABLE(FTL_JIT)