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