Source/JavaScriptCore/bytecode/MethodOfGettingAValueProfile.cpp

/*
 * Copyright (C) 2012-2017 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
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 */

#include "config.h"
#include "MethodOfGettingAValueProfile.h"

#if ENABLE(DFG_JIT)

#include "ArithProfile.h"
#include "CCallHelpers.h"
#include "CodeBlock.h"
#include "JSCInlines.h"

namespace JSC {

MethodOfGettingAValueProfile MethodOfGettingAValueProfile::fromLazyOperand(
    CodeBlock* codeBlock, const LazyOperandValueProfileKey& key)
{
    MethodOfGettingAValueProfile result;
    result.m_kind = LazyOperand;
    result.u.lazyOperand.codeBlock = codeBlock;
    result.u.lazyOperand.bytecodeOffset = key.bytecodeIndex();
    result.u.lazyOperand.operand = key.operand().offset();
    return result;
}

void MethodOfGettingAValueProfile::emitReportValue(CCallHelpers& jit, JSValueRegs regs) const
{
    switch (m_kind) {
    case None:
        return;
        
    case Ready:
        jit.storeValue(regs, u.profile->specFailBucket(0));
        return;
        
    case LazyOperand: {
        LazyOperandValueProfileKey key(u.lazyOperand.bytecodeOffset, VirtualRegister(u.lazyOperand.operand));
        
        ConcurrentJSLocker locker(u.lazyOperand.codeBlock->m_lock);
        LazyOperandValueProfile* profile =
            u.lazyOperand.codeBlock->lazyOperandValueProfiles(locker).add(locker, key);
        jit.storeValue(regs, profile->specFailBucket(0));
        return;
    }
        
    case UnaryArithProfileReady: {
        u.unaryArithProfile->emitObserveResult(jit, regs, DoNotHaveTagRegisters);
        return;
    }

    case BinaryArithProfileReady: {
        u.binaryArithProfile->emitObserveResult(jit, regs, DoNotHaveTagRegisters);
        return;
    }
    }
    
    RELEASE_ASSERT_NOT_REACHED();
}

void MethodOfGettingAValueProfile::reportValue(JSValue value)
{
    switch (m_kind) {
    case None:
        return;

    case Ready:
        *u.profile->specFailBucket(0) = JSValue::encode(value);
        return;

    case LazyOperand: {
        LazyOperandValueProfileKey key(u.lazyOperand.bytecodeOffset, VirtualRegister(u.lazyOperand.operand));

        ConcurrentJSLocker locker(u.lazyOperand.codeBlock->m_lock);
        LazyOperandValueProfile* profile =
            u.lazyOperand.codeBlock->lazyOperandValueProfiles(locker).add(locker, key);
        *profile->specFailBucket(0) = JSValue::encode(value);
        return;
    }

    case UnaryArithProfileReady: {
        u.unaryArithProfile->observeResult(value);
        return;
    }

    case BinaryArithProfileReady: {
        u.binaryArithProfile->observeResult(value);
        return;
    }
    }

    RELEASE_ASSERT_NOT_REACHED();
}

} // namespace JSC

#endif // ENABLE(DFG_JIT)