mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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114 lines
4.4 KiB
C++
114 lines
4.4 KiB
C++
/*
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* Copyright (C) 2016 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 "AirLowerEntrySwitch.h"
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#if ENABLE(B3_JIT)
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#include "AirBlockWorklist.h"
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#include "AirCode.h"
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#include "AirPhaseScope.h"
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#include "B3Procedure.h"
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namespace JSC { namespace B3 { namespace Air {
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void lowerEntrySwitch(Code& code)
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{
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PhaseScope phaseScope(code, "lowerEntrySwitch");
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// Figure out the set of blocks that should be duplicated.
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BlockWorklist worklist;
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for (BasicBlock* block : code) {
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if (block->last().kind.opcode == EntrySwitch)
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worklist.push(block);
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}
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// It's possible that we don't have any EntrySwitches. That's fine.
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if (worklist.seen().isEmpty()) {
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Vector<FrequentedBlock> entrypoints(code.proc().numEntrypoints(), FrequentedBlock(code[0]));
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code.setEntrypoints(WTFMove(entrypoints));
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return;
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}
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while (BasicBlock* block = worklist.pop())
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worklist.pushAll(block->predecessors());
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RELEASE_ASSERT(worklist.saw(code[0]));
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Vector<FrequencyClass> entrypointFrequencies(code.proc().numEntrypoints(), FrequencyClass::Rare);
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for (BasicBlock* block : code) {
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if (block->last().kind.opcode != EntrySwitch)
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continue;
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for (unsigned entrypointIndex = code.proc().numEntrypoints(); entrypointIndex--;) {
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entrypointFrequencies[entrypointIndex] = maxFrequency(
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entrypointFrequencies[entrypointIndex],
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block->successor(entrypointIndex).frequency());
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}
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}
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auto fixEntrySwitch = [&] (BasicBlock* block, unsigned entrypointIndex) {
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if (block->last().kind.opcode != EntrySwitch)
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return;
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FrequentedBlock target = block->successor(entrypointIndex);
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block->last().kind.opcode = Jump;
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block->successors().resize(1);
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block->successor(0) = target;
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};
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// Now duplicate them.
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Vector<FrequentedBlock> entrypoints;
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entrypoints.append(FrequentedBlock(code[0], entrypointFrequencies[0]));
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IndexMap<BasicBlock*, BasicBlock*> map(code.size());
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for (unsigned entrypointIndex = 1; entrypointIndex < code.proc().numEntrypoints(); ++entrypointIndex) {
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map.clear();
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for (BasicBlock* block : worklist.seen().values(code))
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map[block] = code.addBlock(block->frequency());
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entrypoints.append(FrequentedBlock(map[code[0]], entrypointFrequencies[entrypointIndex]));
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for (BasicBlock* block : worklist.seen().values(code)) {
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BasicBlock* newBlock = map[block];
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for (const Inst& inst : *block)
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newBlock->appendInst(inst);
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newBlock->successors() = block->successors();
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for (BasicBlock*& successor : newBlock->successorBlocks()) {
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if (BasicBlock* replacement = map[successor])
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successor = replacement;
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}
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fixEntrySwitch(newBlock, entrypointIndex);
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}
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}
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for (BasicBlock* block : worklist.seen().values(code))
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fixEntrySwitch(block, 0);
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code.setEntrypoints(WTFMove(entrypoints));
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code.resetReachability();
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}
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} } } // namespace JSC::B3::Air
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#endif // ENABLE(B3_JIT)
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