2014-05-22 09:09:21 +02:00
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//===-- sanitizer_deadlock_detector1.cc -----------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Deadlock detector implementation based on NxN adjacency bit matrix.
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//
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//===----------------------------------------------------------------------===//
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#include "sanitizer_deadlock_detector_interface.h"
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#include "sanitizer_deadlock_detector.h"
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#include "sanitizer_allocator_internal.h"
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#include "sanitizer_placement_new.h"
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#include "sanitizer_mutex.h"
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#if SANITIZER_DEADLOCK_DETECTOR_VERSION == 1
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namespace __sanitizer {
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typedef TwoLevelBitVector<> DDBV; // DeadlockDetector's bit vector.
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struct DDPhysicalThread {
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};
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struct DDLogicalThread {
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u64 ctx;
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DeadlockDetectorTLS<DDBV> dd;
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DDReport rep;
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bool report_pending;
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};
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struct DD : public DDetector {
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SpinMutex mtx;
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DeadlockDetector<DDBV> dd;
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DDFlags flags;
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explicit DD(const DDFlags *flags);
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2015-10-21 09:32:45 +02:00
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DDPhysicalThread *CreatePhysicalThread() override;
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void DestroyPhysicalThread(DDPhysicalThread *pt) override;
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2014-05-22 09:09:21 +02:00
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2015-10-21 09:32:45 +02:00
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DDLogicalThread *CreateLogicalThread(u64 ctx) override;
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void DestroyLogicalThread(DDLogicalThread *lt) override;
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2014-05-22 09:09:21 +02:00
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2015-10-21 09:32:45 +02:00
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void MutexInit(DDCallback *cb, DDMutex *m) override;
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void MutexBeforeLock(DDCallback *cb, DDMutex *m, bool wlock) override;
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void MutexAfterLock(DDCallback *cb, DDMutex *m, bool wlock,
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bool trylock) override;
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void MutexBeforeUnlock(DDCallback *cb, DDMutex *m, bool wlock) override;
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void MutexDestroy(DDCallback *cb, DDMutex *m) override;
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2014-05-22 09:09:21 +02:00
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2015-10-21 09:32:45 +02:00
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DDReport *GetReport(DDCallback *cb) override;
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2014-05-22 09:09:21 +02:00
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void MutexEnsureID(DDLogicalThread *lt, DDMutex *m);
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void ReportDeadlock(DDCallback *cb, DDMutex *m);
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};
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DDetector *DDetector::Create(const DDFlags *flags) {
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(void)flags;
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void *mem = MmapOrDie(sizeof(DD), "deadlock detector");
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return new(mem) DD(flags);
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}
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DD::DD(const DDFlags *flags)
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: flags(*flags) {
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dd.clear();
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}
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DDPhysicalThread* DD::CreatePhysicalThread() {
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2015-10-21 09:32:45 +02:00
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return nullptr;
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2014-05-22 09:09:21 +02:00
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}
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void DD::DestroyPhysicalThread(DDPhysicalThread *pt) {
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}
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DDLogicalThread* DD::CreateLogicalThread(u64 ctx) {
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DDLogicalThread *lt = (DDLogicalThread*)InternalAlloc(sizeof(*lt));
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lt->ctx = ctx;
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lt->dd.clear();
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lt->report_pending = false;
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return lt;
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}
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void DD::DestroyLogicalThread(DDLogicalThread *lt) {
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lt->~DDLogicalThread();
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InternalFree(lt);
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}
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void DD::MutexInit(DDCallback *cb, DDMutex *m) {
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m->id = 0;
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m->stk = cb->Unwind();
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}
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void DD::MutexEnsureID(DDLogicalThread *lt, DDMutex *m) {
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if (!dd.nodeBelongsToCurrentEpoch(m->id))
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m->id = dd.newNode(reinterpret_cast<uptr>(m));
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dd.ensureCurrentEpoch(<->dd);
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}
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void DD::MutexBeforeLock(DDCallback *cb,
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DDMutex *m, bool wlock) {
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DDLogicalThread *lt = cb->lt;
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if (lt->dd.empty()) return; // This will be the first lock held by lt.
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if (dd.hasAllEdges(<->dd, m->id)) return; // We already have all edges.
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SpinMutexLock lk(&mtx);
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MutexEnsureID(lt, m);
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if (dd.isHeld(<->dd, m->id))
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return; // FIXME: allow this only for recursive locks.
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if (dd.onLockBefore(<->dd, m->id)) {
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// Actually add this edge now so that we have all the stack traces.
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dd.addEdges(<->dd, m->id, cb->Unwind(), cb->UniqueTid());
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ReportDeadlock(cb, m);
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}
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}
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void DD::ReportDeadlock(DDCallback *cb, DDMutex *m) {
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DDLogicalThread *lt = cb->lt;
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uptr path[10];
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uptr len = dd.findPathToLock(<->dd, m->id, path, ARRAY_SIZE(path));
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CHECK_GT(len, 0U); // Hm.. cycle of 10 locks? I'd like to see that.
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CHECK_EQ(m->id, path[0]);
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lt->report_pending = true;
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DDReport *rep = <->rep;
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rep->n = len;
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for (uptr i = 0; i < len; i++) {
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uptr from = path[i];
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uptr to = path[(i + 1) % len];
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DDMutex *m0 = (DDMutex*)dd.getData(from);
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DDMutex *m1 = (DDMutex*)dd.getData(to);
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u32 stk_from = -1U, stk_to = -1U;
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int unique_tid = 0;
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dd.findEdge(from, to, &stk_from, &stk_to, &unique_tid);
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// Printf("Edge: %zd=>%zd: %u/%u T%d\n", from, to, stk_from, stk_to,
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// unique_tid);
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rep->loop[i].thr_ctx = unique_tid;
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rep->loop[i].mtx_ctx0 = m0->ctx;
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rep->loop[i].mtx_ctx1 = m1->ctx;
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rep->loop[i].stk[0] = stk_to;
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rep->loop[i].stk[1] = stk_from;
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}
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}
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void DD::MutexAfterLock(DDCallback *cb, DDMutex *m, bool wlock, bool trylock) {
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DDLogicalThread *lt = cb->lt;
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u32 stk = 0;
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if (flags.second_deadlock_stack)
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stk = cb->Unwind();
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// Printf("T%p MutexLock: %zx stk %u\n", lt, m->id, stk);
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if (dd.onFirstLock(<->dd, m->id, stk))
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return;
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if (dd.onLockFast(<->dd, m->id, stk))
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return;
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SpinMutexLock lk(&mtx);
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MutexEnsureID(lt, m);
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if (wlock) // Only a recursive rlock may be held.
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CHECK(!dd.isHeld(<->dd, m->id));
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if (!trylock)
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dd.addEdges(<->dd, m->id, stk ? stk : cb->Unwind(), cb->UniqueTid());
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dd.onLockAfter(<->dd, m->id, stk);
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}
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void DD::MutexBeforeUnlock(DDCallback *cb, DDMutex *m, bool wlock) {
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// Printf("T%p MutexUnLock: %zx\n", cb->lt, m->id);
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dd.onUnlock(&cb->lt->dd, m->id);
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}
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void DD::MutexDestroy(DDCallback *cb,
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DDMutex *m) {
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if (!m->id) return;
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SpinMutexLock lk(&mtx);
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if (dd.nodeBelongsToCurrentEpoch(m->id))
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dd.removeNode(m->id);
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m->id = 0;
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}
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DDReport *DD::GetReport(DDCallback *cb) {
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if (!cb->lt->report_pending)
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2015-10-21 09:32:45 +02:00
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return nullptr;
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2014-05-22 09:09:21 +02:00
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cb->lt->report_pending = false;
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return &cb->lt->rep;
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}
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2015-10-21 09:32:45 +02:00
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} // namespace __sanitizer
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#endif // #if SANITIZER_DEADLOCK_DETECTOR_VERSION == 1
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