mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-13 20:30:24 +00:00
99 lines
3.7 KiB
C++
99 lines
3.7 KiB
C++
/*
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* Copyright (C) 2013-2018 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 "DFGPredictionInjectionPhase.h"
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#if ENABLE(DFG_JIT)
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#include "DFGGraph.h"
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#include "DFGPhase.h"
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#include "JSCJSValueInlines.h"
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namespace JSC { namespace DFG {
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class PredictionInjectionPhase : public Phase {
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public:
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PredictionInjectionPhase(Graph& graph)
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: Phase(graph, "prediction injection")
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{
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}
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bool run()
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{
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ASSERT(m_graph.m_form == ThreadedCPS);
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ASSERT(m_graph.m_unificationState == GloballyUnified);
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ASSERT(codeBlock()->numParameters() >= 1);
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{
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ConcurrentJSLocker locker(profiledBlock()->m_lock);
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// We only do this for the arguments at the first block. The arguments from
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// other entrypoints have already been populated with their predictions.
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auto& arguments = m_graph.m_rootToArguments.find(m_graph.block(0))->value;
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for (size_t arg = 0; arg < static_cast<size_t>(codeBlock()->numParameters()); ++arg) {
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ValueProfile& profile = profiledBlock()->valueProfileForArgument(arg);
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arguments[arg]->variableAccessData()->predict(
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profile.computeUpdatedPrediction(locker));
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}
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}
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for (BlockIndex blockIndex = 0; blockIndex < m_graph.numBlocks(); ++blockIndex) {
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BasicBlock* block = m_graph.block(blockIndex);
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if (!block)
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continue;
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if (!block->isOSRTarget)
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continue;
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if (block->bytecodeBegin != m_graph.m_plan.osrEntryBytecodeIndex())
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continue;
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const Operands<Optional<JSValue>>& mustHandleValues = m_graph.m_plan.mustHandleValues();
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for (size_t i = 0; i < mustHandleValues.size(); ++i) {
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Operand operand = mustHandleValues.operandForIndex(i);
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Optional<JSValue> value = mustHandleValues[i];
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if (!value)
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continue;
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Node* node = block->variablesAtHead.operand(operand);
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if (!node)
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continue;
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ASSERT(node->accessesStack(m_graph));
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node->variableAccessData()->predict(speculationFromValue(value.value()));
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}
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}
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return true;
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}
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};
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bool performPredictionInjection(Graph& graph)
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{
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return runPhase<PredictionInjectionPhase>(graph);
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}
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} } // namespace JSC::DFG
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#endif // ENABLE(DFG_JIT)
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