Source/JavaScriptCore/dfg/DFGNode.cpp

/*
 * Copyright (C) 2013, 2014 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 "DFGNode.h"

#if ENABLE(DFG_JIT)

#include "DFGGraph.h"
#include "DFGNodeAllocator.h"
#include "JSCInlines.h"

namespace JSC { namespace DFG {

bool MultiPutByOffsetData::writesStructures() const
{
    for (unsigned i = variants.size(); i--;) {
        if (variants[i].kind() == PutByIdVariant::Transition)
            return true;
    }
    return false;
}

bool MultiPutByOffsetData::reallocatesStorage() const
{
    for (unsigned i = variants.size(); i--;) {
        if (variants[i].kind() != PutByIdVariant::Transition)
            continue;
        
        if (variants[i].oldStructure()->outOfLineCapacity() ==
            variants[i].newStructure()->outOfLineCapacity())
            continue;
        
        return true;
    }
    return false;
}

void BranchTarget::dump(PrintStream& out) const
{
    if (!block)
        return;
    
    out.print(*block);
    
    if (count == count) // If the count is not NaN, then print it.
        out.print("/w:", count);
}

unsigned Node::index() const
{
    return NodeAllocator::allocatorOf(this)->indexOf(this);
}

bool Node::hasVariableAccessData(Graph& graph)
{
    switch (op()) {
    case Phi:
        return graph.m_form != SSA;
    case GetLocal:
    case GetArgument:
    case SetLocal:
    case SetArgument:
    case Flush:
    case PhantomLocal:
        return true;
    default:
        return false;
    }
}

void Node::convertToIdentity()
{
    RELEASE_ASSERT(child1());
    RELEASE_ASSERT(!child2());
    NodeFlags result = canonicalResultRepresentation(this->result());
    setOpAndDefaultFlags(Identity);
    setResult(result);
}

} } // namespace JSC::DFG

namespace WTF {

using namespace JSC;
using namespace JSC::DFG;

void printInternal(PrintStream& out, SwitchKind kind)
{
    switch (kind) {
    case SwitchImm:
        out.print("SwitchImm");
        return;
    case SwitchChar:
        out.print("SwitchChar");
        return;
    case SwitchString:
        out.print("SwitchString");
        return;
    }
    RELEASE_ASSERT_NOT_REACHED();
}

void printInternal(PrintStream& out, Node* node)
{
    if (!node) {
        out.print("-");
        return;
    }
    out.print("@", node->index());
    if (node->hasDoubleResult())
        out.print("<Double>");
    else if (node->hasInt52Result())
        out.print("<Int52>");
}

} // namespace WTF

#endif // ENABLE(DFG_JIT)