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diff --git a/Source/JavaScriptCore/dfg/DFGFlushLivenessAnalysisPhase.cpp b/Source/JavaScriptCore/dfg/DFGFlushLivenessAnalysisPhase.cpp
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--- a/Source/JavaScriptCore/dfg/DFGFlushLivenessAnalysisPhase.cpp
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-/*
- * Copyright (C) 2013 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
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "DFGFlushLivenessAnalysisPhase.h"
-
-#if ENABLE(DFG_JIT)
-
-#include "DFGBasicBlockInlines.h"
-#include "DFGGraph.h"
-#include "DFGInsertionSet.h"
-#include "DFGPhase.h"
-#include "OperandsInlines.h"
-#include "Operations.h"
-
-namespace JSC { namespace DFG {
-
-class FlushLivenessAnalysisPhase : public Phase {
-public:
- FlushLivenessAnalysisPhase(Graph& graph)
- : Phase(graph, "flush-liveness analysis")
- {
- }
-
- bool run()
- {
- ASSERT(m_graph.m_form == SSA);
-
- // Liveness is a backwards analysis; the roots are the blocks that
- // end in a terminal (Return/Unreachable). For now, we
- // use a fixpoint formulation since liveness is a rapid analysis with
- // convergence guaranteed after O(connectivity).
-
- // Start by assuming that everything is dead.
- for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;) {
- BasicBlock* block = m_graph.block(blockIndex);
- if (!block)
- continue;
- block->ssa->flushAtHead.fill(FlushedAt());
- block->ssa->flushAtTail.fill(FlushedAt());
- }
-
- do {
- m_changed = false;
- for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;)
- process(blockIndex);
- } while (m_changed);
-
- Operands<FlushedAt>& root = m_graph.block(0)->ssa->flushAtHead;
- for (unsigned i = root.size(); i--;) {
- if (root.isArgument(i)) {
- if (!root[i]
- || root[i] == FlushedAt(FlushedJSValue, VirtualRegister(root.operandForIndex(i))))
- continue;
- } else {
- if (!root[i])
- continue;
- }
- dataLog(
- "Bad flush liveness analysis result: bad flush liveness at root: ",
- root, "\n");
- dataLog("IR at time of error:\n");
- m_graph.dump();
- CRASH();
- }
-
- return true;
- }
-
-private:
- void process(BlockIndex blockIndex)
- {
- BasicBlock* block = m_graph.block(blockIndex);
- if (!block)
- return;
-
- m_live = block->ssa->flushAtTail;
-
- for (unsigned nodeIndex = block->size(); nodeIndex--;) {
- Node* node = block->at(nodeIndex);
-
- switch (node->op()) {
- case SetLocal: {
- VariableAccessData* variable = node->variableAccessData();
- FlushedAt& current = m_live.operand(variable->local());
- if (!!current && current != variable->flushedAt())
- reportError(node);
- current = FlushedAt();
- break;
- }
-
- case GetArgument: {
- VariableAccessData* variable = node->variableAccessData();
- ASSERT(variable->local() == variable->machineLocal());
- ASSERT(variable->local().isArgument());
- FlushedAt& current = m_live.operand(variable->local());
- if (!!current && current != variable->flushedAt())
- reportError(node);
- current = FlushedAt(FlushedJSValue, node->local());
- break;
- }
-
- case Flush:
- case GetLocal: {
- VariableAccessData* variable = node->variableAccessData();
- FlushedAt& current = m_live.operand(variable->local());
- if (!!current && current != variable->flushedAt())
- reportError(node);
- current = variable->flushedAt();
- break;
- }
-
- default:
- break;
- }
- }
-
- if (m_live == block->ssa->flushAtHead)
- return;
-
- m_changed = true;
- block->ssa->flushAtHead = m_live;
- for (unsigned i = block->predecessors.size(); i--;) {
- BasicBlock* predecessor = block->predecessors[i];
- for (unsigned j = m_live.size(); j--;) {
- FlushedAt& predecessorFlush = predecessor->ssa->flushAtTail[j];
- FlushedAt myFlush = m_live[j];
-
- // Three possibilities:
- // 1) Predecessor format is Dead, in which case it acquires our format.
- // 2) Predecessor format is not Dead but our format is dead, in which
- // case we acquire the predecessor format.
- // 3) Predecessor format is identical to our format, in which case we
- // do nothing.
- // 4) Predecessor format is different from our format and it's not Dead,
- // in which case we have an erroneous set of Flushes and SetLocals.
-
- if (!predecessorFlush) {
- predecessorFlush = myFlush;
- continue;
- }
-
- if (!myFlush) {
- m_live[j] = predecessorFlush;
- continue;
- }
-
- if (predecessorFlush == myFlush)
- continue;
-
- dataLog(
- "Bad Flush merge at edge ", *predecessor, " -> ", *block,
- ", local variable r", m_live.operandForIndex(j), ": ", *predecessor,
- " has ", predecessorFlush, " and ", *block, " has ", myFlush, ".\n");
- dataLog("IR at time of error:\n");
- m_graph.dump();
- CRASH();
- }
- }
- }
-
- NO_RETURN_DUE_TO_CRASH void reportError(Node* node)
- {
- dataLog(
- "Bad flush merge at node ", node, ", r", node->local(), ": node claims ",
- node->variableAccessData()->flushedAt(), " but backwards flow claims ",
- m_live.operand(node->local()), ".\n");
- dataLog("IR at time of error:\n");
- m_graph.dump();
- CRASH();
- }
-
- bool m_changed;
- Operands<FlushedAt> m_live;
-};
-
-bool performFlushLivenessAnalysis(Graph& graph)
-{
- SamplingRegion samplingRegion("DFG Flush-Liveness Analysis Phase");
- return runPhase<FlushLivenessAnalysisPhase>(graph);
-}
-
-} } // namespace JSC::DFG
-
-#endif // ENABLE(DFG_JIT)
-
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