mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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70 lines
2.5 KiB
C++
70 lines
2.5 KiB
C++
/*
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* Copyright (C) 2016-2018 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "B3BreakCriticalEdges.h"
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#if ENABLE(B3_JIT)
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#include "B3BasicBlockInlines.h"
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#include "B3BlockInsertionSet.h"
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#include "B3ValueInlines.h"
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namespace JSC { namespace B3 {
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void breakCriticalEdges(Procedure& proc)
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{
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BlockInsertionSet insertionSet(proc);
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for (BasicBlock* block : proc) {
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// Non-void terminals that are the moral equivalent of jumps trigger critical edge breaking
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// because of fixSSA's demoteValues.
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if (block->numSuccessors() <= 1
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&& block->last()->type() == Void)
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continue;
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for (BasicBlock*& successor : block->successorBlocks()) {
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if (successor->numPredecessors() <= 1)
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continue;
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BasicBlock* pad =
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insertionSet.insertBefore(successor, successor->frequency());
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pad->appendNew<Value>(proc, Jump, successor->at(0)->origin());
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pad->setSuccessors(FrequentedBlock(successor));
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pad->addPredecessor(block);
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successor->replacePredecessor(block, pad);
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successor = pad;
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}
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}
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if (insertionSet.execute())
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proc.invalidateCFG();
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}
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} } // namespace JSC::B3
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#endif // ENABLE(B3_JIT)
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