/*
 * Copyright (C) 2016-2018 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
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */

#include "config.h"
#include "B3BreakCriticalEdges.h"

#if ENABLE(B3_JIT)

#include "B3BasicBlockInlines.h"
#include "B3BlockInsertionSet.h"
#include "B3ProcedureInlines.h"
#include "B3ValueInlines.h"

namespace JSC { namespace B3 {

void breakCriticalEdges(Procedure& proc)
{
    BlockInsertionSet insertionSet(proc);
    
    for (BasicBlock* block : proc) {
        // Non-void terminals that are the moral equivalent of jumps trigger critical edge breaking
        // because of fixSSA's demoteValues.
        if (block->numSuccessors() <= 1
            && block->last()->type() == Void)
            continue;

        for (BasicBlock*& successor : block->successorBlocks()) {
            if (successor->numPredecessors() <= 1)
                continue;

            BasicBlock* pad =
                insertionSet.insertBefore(successor, successor->frequency());
            pad->appendNew<Value>(proc, Jump, successor->at(0)->origin());
            pad->setSuccessors(FrequentedBlock(successor));
            pad->addPredecessor(block);
            successor->replacePredecessor(block, pad);
            successor = pad;
        }
    }

    if (insertionSet.execute())
        proc.invalidateCFG();
}

} } // namespace JSC::B3

#endif // ENABLE(B3_JIT)