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/*
* Copyright (C) 2017-2024 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.
*/
#pragma once
#if ENABLE(WEBASSEMBLY_OMGJIT) || ENABLE(WEBASSEMBLY_BBQJIT)
#include "CompilationResult.h"
#include "ExecutionCounter.h"
#include "Options.h"
#include "WasmOSREntryData.h"
#include <wtf/Atomics.h>
#include <wtf/SegmentedVector.h>
#include <wtf/StdLibExtras.h>
#include <wtf/TZoneMalloc.h>
namespace JSC { namespace Wasm {
class OSREntryData;
// This class manages the tier up counts for Wasm binaries. The main interesting thing about
// wasm tiering up counts is that the least significant bit indicates if the tier up has already
// started. Also, wasm code does not atomically update this count. This is because we
// don't care too much if the countdown is slightly off. The tier up trigger is atomic, however,
// so tier up will be triggered exactly once.
class TierUpCount : public UpperTierExecutionCounter {
WTF_MAKE_TZONE_ALLOCATED(TierUpCount);
WTF_MAKE_NONCOPYABLE(TierUpCount);
public:
enum class TriggerReason : uint8_t {
DontTrigger,
CompilationDone,
StartCompilation,
};
enum class CompilationStatus : uint8_t {
NotCompiled,
StartCompilation,
Compiled,
};
TierUpCount();
~TierUpCount();
static int32_t loopIncrement() { return Options::omgTierUpCounterIncrementForLoop(); }
static int32_t functionEntryIncrement() { return Options::omgTierUpCounterIncrementForEntry(); }
SegmentedVector<TriggerReason, 16>& osrEntryTriggers() { return m_osrEntryTriggers; }
Vector<uint32_t>& outerLoops() { return m_outerLoops; }
Lock& getLock() { return m_lock; }
OSREntryData& addOSREntryData(FunctionCodeIndex functionIndex, uint32_t loopIndex, StackMap&&);
OSREntryData& osrEntryData(uint32_t loopIndex);
void optimizeAfterWarmUp(FunctionCodeIndex functionIndex)
{
dataLogLnIf(Options::verboseOSR(), "\t[", functionIndex, "] OMG-optimizing after warm-up.");
setNewThreshold(Options::thresholdForOMGOptimizeAfterWarmUp());
}
bool checkIfOptimizationThresholdReached()
{
return checkIfThresholdCrossedAndSet(nullptr);
}
void dontOptimizeAnytimeSoon(FunctionCodeIndex functionIndex)
{
dataLogLnIf(Options::verboseOSR(), functionIndex, ": Not OMG-optimizing anytime soon.");
deferIndefinitely();
}
void optimizeNextInvocation(FunctionCodeIndex functionIndex)
{
dataLogLnIf(Options::verboseOSR(), functionIndex, ": OMG-optimizing next invocation.");
setNewThreshold(0);
}
void optimizeSoon(FunctionCodeIndex functionIndex)
{
dataLogLnIf(Options::verboseOSR(), functionIndex, ": OMG-optimizing soon.");
// FIXME: Need adjustment once we get more information about wasm functions.
setNewThreshold(Options::thresholdForOMGOptimizeSoon());
}
void setOptimizationThresholdBasedOnCompilationResult(FunctionCodeIndex functionIndex, CompilationResult result)
{
switch (result) {
case CompilationSuccessful:
optimizeNextInvocation(functionIndex);
return;
case CompilationFailed:
dontOptimizeAnytimeSoon(functionIndex);
return;
case CompilationDeferred:
optimizeAfterWarmUp(functionIndex);
return;
case CompilationInvalidated:
// This is weird - it will only happen in cases when the DFG code block (i.e.
// the code block that this JITCode belongs to) is also invalidated. So it
// doesn't really matter what we do. But, we do the right thing anyway. Note
// that us counting the reoptimization actually means that we might count it
// twice. But that's generally OK. It's better to overcount reoptimizations
// than it is to undercount them.
optimizeAfterWarmUp(functionIndex);
return;
}
RELEASE_ASSERT_NOT_REACHED();
}
ALWAYS_INLINE CompilationStatus compilationStatusForOMG(MemoryMode mode) { return m_compilationStatusForOMG[static_cast<MemoryModeType>(mode)]; }
ALWAYS_INLINE void setCompilationStatusForOMG(MemoryMode mode, CompilationStatus status) { m_compilationStatusForOMG[static_cast<MemoryModeType>(mode)] = status; }
ALWAYS_INLINE CompilationStatus compilationStatusForOMGForOSREntry(MemoryMode mode) { return m_compilationStatusForOMGForOSREntry[static_cast<MemoryModeType>(mode)]; }
ALWAYS_INLINE void setCompilationStatusForOMGForOSREntry(MemoryMode mode, CompilationStatus status) { m_compilationStatusForOMGForOSREntry[static_cast<MemoryModeType>(mode)] = status; }
Lock m_lock;
std::array<CompilationStatus, numberOfMemoryModes> m_compilationStatusForOMG;
std::array<CompilationStatus, numberOfMemoryModes> m_compilationStatusForOMGForOSREntry;
SegmentedVector<TriggerReason, 16> m_osrEntryTriggers;
Vector<uint32_t> m_outerLoops;
Vector<std::unique_ptr<OSREntryData>> m_osrEntryData;
};
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY_OMGJIT) || ENABLE(WEBASSEMBLY_BBQJIT)
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