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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "GCHeapProfilerImpl.h"
#include "UncensoredAllocator.h"
namespace mozilla {
GCHeapProfilerImpl::GCHeapProfilerImpl()
{
mLock = PR_NewLock();
mMarking = false;
}
GCHeapProfilerImpl::~GCHeapProfilerImpl()
{
if (mLock) {
PR_DestroyLock(mLock);
}
}
nsTArray<nsCString>
GCHeapProfilerImpl::GetNames() const
{
return mTraceTable.GetNames();
}
nsTArray<TrieNode>
GCHeapProfilerImpl::GetTraces() const
{
return mTraceTable.GetTraces();
}
const nsTArray<AllocEvent>&
GCHeapProfilerImpl::GetEvents() const
{
return mAllocEvents;
}
void
GCHeapProfilerImpl::reset()
{
mTraceTable.Reset();
mAllocEvents.Clear();
mNurseryEntries.Clear();
mTenuredEntriesFG.Clear();
mTenuredEntriesBG.Clear();
}
void
GCHeapProfilerImpl::sampleTenured(void* addr, uint32_t size)
{
SampleInternal(addr, size, mTenuredEntriesFG);
}
void
GCHeapProfilerImpl::sampleNursery(void* addr, uint32_t size)
{
SampleInternal(addr, size, mNurseryEntries);
}
void
GCHeapProfilerImpl::markTenuredStart()
{
AutoUseUncensoredAllocator ua;
AutoMPLock lock(mLock);
if (!mMarking) {
mMarking = true;
mTenuredEntriesFG.SwapElements(mTenuredEntriesBG);
MOZ_ASSERT(mTenuredEntriesFG.Count() == 0);
}
}
void
GCHeapProfilerImpl::markTenured(void* addr)
{
AutoUseUncensoredAllocator ua;
AutoMPLock lock(mLock);
if (mMarking) {
AllocEntry entry;
if (mTenuredEntriesBG.Get(addr, &entry)) {
entry.mMarked = true;
mTenuredEntriesBG.Put(addr, entry);
}
}
}
void
GCHeapProfilerImpl::sweepTenured()
{
AutoUseUncensoredAllocator ua;
AutoMPLock lock(mLock);
if (mMarking) {
mMarking = false;
for (auto iter = mTenuredEntriesBG.Iter(); !iter.Done(); iter.Next()) {
if (iter.Data().mMarked) {
iter.Data().mMarked = false;
mTenuredEntriesFG.Put(iter.Key(), iter.Data());
} else {
AllocEvent& oldEvent = mAllocEvents[iter.Data().mEventIdx];
AllocEvent newEvent(oldEvent.mTraceIdx, -oldEvent.mSize, TimeStamp::Now());
mAllocEvents.AppendElement(newEvent);
}
}
mTenuredEntriesBG.Clear();
}
}
void
GCHeapProfilerImpl::sweepNursery()
{
AutoUseUncensoredAllocator ua;
AutoMPLock lock(mLock);
for (auto iter = mNurseryEntries.Iter(); !iter.Done(); iter.Next()) {
AllocEvent& oldEvent = mAllocEvents[iter.Data().mEventIdx];
AllocEvent newEvent(oldEvent.mTraceIdx, -oldEvent.mSize, TimeStamp::Now());
mAllocEvents.AppendElement(newEvent);
}
mNurseryEntries.Clear();
}
void
GCHeapProfilerImpl::moveNurseryToTenured(void* addrOld, void* addrNew)
{
AutoUseUncensoredAllocator ua;
AutoMPLock lock(mLock);
AllocEntry entryOld;
if (!mNurseryEntries.Get(addrOld, &entryOld)) {
return;
}
// Because the tenured heap is sampled, the address might already be there.
// If not, the address is inserted with the old event.
AllocEntry tenuredEntryOld;
if (!mTenuredEntriesFG.Get(addrNew, &tenuredEntryOld)) {
mTenuredEntriesFG.Put(addrNew, AllocEntry(entryOld.mEventIdx));
} else {
// If it is already inserted, the insertion above will fail and the
// iterator of the already-inserted element is returned.
// We choose to ignore the the new event by setting its size zero and point
// the newly allocated address to the old event.
// An event of size zero will be skipped when reporting.
mAllocEvents[entryOld.mEventIdx].mSize = 0;
tenuredEntryOld.mEventIdx = entryOld.mEventIdx;
mTenuredEntriesFG.Put(addrNew, tenuredEntryOld);
}
mNurseryEntries.Remove(addrOld);
}
void
GCHeapProfilerImpl::SampleInternal(void* aAddr, uint32_t aSize, AllocMap& aTable)
{
AutoUseUncensoredAllocator ua;
AutoMPLock lock(mLock);
size_t nSamples = AddBytesSampled(aSize);
if (nSamples > 0) {
nsTArray<nsCString> trace = GetStacktrace();
AllocEvent ai(mTraceTable.Insert(trace), nSamples * mSampleSize, TimeStamp::Now());
aTable.Put(aAddr, AllocEntry(mAllocEvents.Length()));
mAllocEvents.AppendElement(ai);
}
}
} // namespace mozilla
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