Source/JavaScriptCore/b3/B3UseCounts.cpp

/*
 * Copyright (C) 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 "B3UseCounts.h"

#if ENABLE(B3_JIT)

#include "B3Procedure.h"
#include "B3ValueInlines.h"

namespace JSC { namespace B3 {

UseCounts::UseCounts(Procedure& procedure)
    : m_counts(procedure.values().size())
{
    Vector<Value*, 64> children;
    for (Value* value : procedure.values()) {
        children.shrink(0);
        for (Value* child : value->children()) {
            m_counts[child].numUses++;
            children.append(child);
        }
        std::sort(children.begin(), children.end());
        Value* last = nullptr;
        for (Value* child : children) {
            if (child == last)
                continue;

            m_counts[child].numUsingInstructions++;
            last = child;
        }
    }
}

UseCounts::~UseCounts()
{
}

} } // namespace JSC::B3

#endif // ENABLE(B3_JIT)