mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
133 lines
4.4 KiB
C++
133 lines
4.4 KiB
C++
/*
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* Copyright (C) 2013-2015 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 "DFGWatchpointCollectionPhase.h"
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#if ENABLE(DFG_JIT)
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#include "ArrayPrototype.h"
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#include "DFGClobberize.h"
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#include "DFGGraph.h"
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#include "DFGPhase.h"
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#include "JSCInlines.h"
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// FIXME: Remove this phase entirely by moving the addLazily() calls into either the backend or
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// into the phase that performs the optimization. Moving the calls into the backend makes the most
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// sense when the intermediate phases don't need to know that the watchpoint was set. Moving the
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// calls earlier usually only makes sense if the node's only purpose was to convey the need for
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// the watchpoint (like VarInjectionWatchpoint). But, it can also make sense if the fact that the
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// watchpoint was set enables other optimizations.
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// https://bugs.webkit.org/show_bug.cgi?id=144669
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namespace JSC { namespace DFG {
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class WatchpointCollectionPhase : public Phase {
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static const bool verbose = false;
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public:
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WatchpointCollectionPhase(Graph& graph)
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: Phase(graph, "watchpoint collection")
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{
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}
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bool run()
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{
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for (BlockIndex 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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for (unsigned nodeIndex = block->size(); nodeIndex--;) {
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m_node = block->at(nodeIndex);
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handle();
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}
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}
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return true;
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}
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private:
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void handle()
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{
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switch (m_node->op()) {
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case IsUndefined:
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handleMasqueradesAsUndefined();
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break;
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case CompareEq:
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if (m_node->isBinaryUseKind(ObjectUse)
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|| (m_node->child1().useKind() == ObjectUse && m_node->child2().useKind() == ObjectOrOtherUse)
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|| (m_node->child1().useKind() == ObjectOrOtherUse && m_node->child2().useKind() == ObjectUse)
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|| (m_node->child1().useKind() == KnownOtherUse || m_node->child2().useKind() == KnownOtherUse))
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handleMasqueradesAsUndefined();
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break;
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case LogicalNot:
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case Branch:
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switch (m_node->child1().useKind()) {
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case ObjectOrOtherUse:
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case UntypedUse:
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handleMasqueradesAsUndefined();
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break;
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default:
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break;
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}
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break;
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default:
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break;
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}
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}
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void handleMasqueradesAsUndefined()
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{
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if (m_graph.masqueradesAsUndefinedWatchpointIsStillValid(m_node->origin.semantic))
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addLazily(globalObject()->masqueradesAsUndefinedWatchpoint());
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}
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void addLazily(WatchpointSet* set)
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{
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m_graph.watchpoints().addLazily(set);
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}
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JSGlobalObject* globalObject()
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{
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return m_graph.globalObjectFor(m_node->origin.semantic);
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}
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Node* m_node;
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};
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bool performWatchpointCollection(Graph& graph)
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{
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return runPhase<WatchpointCollectionPhase>(graph);
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}
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} } // namespace JSC::DFG
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#endif // ENABLE(DFG_JIT)
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