2012-11-22 23:03:11 +01:00
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//===-- tsan_rtl_thread.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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// This file is a part of ThreadSanitizer (TSan), a race detector.
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//
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_placement_new.h"
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#include "tsan_rtl.h"
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#include "tsan_mman.h"
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#include "tsan_platform.h"
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#include "tsan_report.h"
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#include "tsan_sync.h"
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namespace __tsan {
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2013-11-04 22:33:31 +01:00
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// ThreadContext implementation.
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ThreadContext::ThreadContext(int tid)
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: ThreadContextBase(tid)
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, thr()
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, sync()
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, epoch0()
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, epoch1() {
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}
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2012-11-22 23:03:11 +01:00
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#ifndef TSAN_GO
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2013-11-04 22:33:31 +01:00
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ThreadContext::~ThreadContext() {
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}
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2012-11-22 23:03:11 +01:00
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#endif
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2013-11-04 22:33:31 +01:00
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void ThreadContext::OnDead() {
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sync.Reset();
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}
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void ThreadContext::OnJoined(void *arg) {
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ThreadState *caller_thr = static_cast<ThreadState *>(arg);
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2013-12-05 10:18:38 +01:00
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AcquireImpl(caller_thr, 0, &sync);
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2013-11-04 22:33:31 +01:00
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sync.Reset();
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}
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struct OnCreatedArgs {
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ThreadState *thr;
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uptr pc;
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};
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void ThreadContext::OnCreated(void *arg) {
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thr = 0;
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if (tid == 0)
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2012-11-22 23:03:11 +01:00
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return;
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2013-11-04 22:33:31 +01:00
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OnCreatedArgs *args = static_cast<OnCreatedArgs *>(arg);
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args->thr->fast_state.IncrementEpoch();
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// Can't increment epoch w/o writing to the trace as well.
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TraceAddEvent(args->thr, args->thr->fast_state, EventTypeMop, 0);
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2013-12-05 10:18:38 +01:00
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ReleaseImpl(args->thr, 0, &sync);
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2013-11-04 22:33:31 +01:00
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creation_stack_id = CurrentStackId(args->thr, args->pc);
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if (reuse_count == 0)
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StatInc(args->thr, StatThreadMaxTid);
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}
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void ThreadContext::OnReset() {
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sync.Reset();
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FlushUnneededShadowMemory(GetThreadTrace(tid), TraceSize() * sizeof(Event));
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//!!! FlushUnneededShadowMemory(GetThreadTraceHeader(tid), sizeof(Trace));
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}
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struct OnStartedArgs {
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ThreadState *thr;
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uptr stk_addr;
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uptr stk_size;
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uptr tls_addr;
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uptr tls_size;
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};
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void ThreadContext::OnStarted(void *arg) {
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OnStartedArgs *args = static_cast<OnStartedArgs*>(arg);
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thr = args->thr;
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// RoundUp so that one trace part does not contain events
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// from different threads.
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epoch0 = RoundUp(epoch1 + 1, kTracePartSize);
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epoch1 = (u64)-1;
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2014-05-22 09:09:21 +02:00
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new(thr) ThreadState(ctx, tid, unique_id, epoch0, reuse_count,
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args->stk_addr, args->stk_size, args->tls_addr, args->tls_size);
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2013-12-05 10:18:38 +01:00
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#ifndef TSAN_GO
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thr->shadow_stack = &ThreadTrace(thr->tid)->shadow_stack[0];
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thr->shadow_stack_pos = thr->shadow_stack;
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thr->shadow_stack_end = thr->shadow_stack + kShadowStackSize;
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#else
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2013-11-04 22:33:31 +01:00
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// Setup dynamic shadow stack.
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const int kInitStackSize = 8;
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2013-12-05 10:18:38 +01:00
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thr->shadow_stack = (uptr*)internal_alloc(MBlockShadowStack,
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2013-11-04 22:33:31 +01:00
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kInitStackSize * sizeof(uptr));
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2013-12-05 10:18:38 +01:00
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thr->shadow_stack_pos = thr->shadow_stack;
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thr->shadow_stack_end = thr->shadow_stack + kInitStackSize;
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2013-11-04 22:33:31 +01:00
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#endif
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#ifndef TSAN_GO
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2013-12-05 10:18:38 +01:00
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AllocatorThreadStart(thr);
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2013-11-04 22:33:31 +01:00
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#endif
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2014-05-22 09:09:21 +02:00
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if (flags()->detect_deadlocks) {
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thr->dd_pt = ctx->dd->CreatePhysicalThread();
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thr->dd_lt = ctx->dd->CreateLogicalThread(unique_id);
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}
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2013-11-04 22:33:31 +01:00
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thr->fast_synch_epoch = epoch0;
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2013-12-05 10:18:38 +01:00
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AcquireImpl(thr, 0, &sync);
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2013-11-04 22:33:31 +01:00
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thr->fast_state.SetHistorySize(flags()->history_size);
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const uptr trace = (epoch0 / kTracePartSize) % TraceParts();
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Trace *thr_trace = ThreadTrace(thr->tid);
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thr_trace->headers[trace].epoch0 = epoch0;
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StatInc(thr, StatSyncAcquire);
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sync.Reset();
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DPrintf("#%d: ThreadStart epoch=%zu stk_addr=%zx stk_size=%zx "
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"tls_addr=%zx tls_size=%zx\n",
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tid, (uptr)epoch0, args->stk_addr, args->stk_size,
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args->tls_addr, args->tls_size);
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thr->is_alive = true;
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}
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void ThreadContext::OnFinished() {
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if (!detached) {
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thr->fast_state.IncrementEpoch();
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// Can't increment epoch w/o writing to the trace as well.
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TraceAddEvent(thr, thr->fast_state, EventTypeMop, 0);
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2013-12-05 10:18:38 +01:00
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ReleaseImpl(thr, 0, &sync);
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2013-11-04 22:33:31 +01:00
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}
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epoch1 = thr->fast_state.epoch();
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2014-05-22 09:09:21 +02:00
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if (flags()->detect_deadlocks) {
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ctx->dd->DestroyPhysicalThread(thr->dd_pt);
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ctx->dd->DestroyLogicalThread(thr->dd_lt);
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}
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2013-11-04 22:33:31 +01:00
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#ifndef TSAN_GO
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AllocatorThreadFinish(thr);
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#endif
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thr->~ThreadState();
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2014-05-22 09:09:21 +02:00
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StatAggregate(ctx->stat, thr->stat);
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2013-11-04 22:33:31 +01:00
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thr = 0;
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}
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#ifndef TSAN_GO
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struct ThreadLeak {
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ThreadContext *tctx;
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int count;
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};
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static void MaybeReportThreadLeak(ThreadContextBase *tctx_base, void *arg) {
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Vector<ThreadLeak> &leaks = *(Vector<ThreadLeak>*)arg;
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ThreadContext *tctx = static_cast<ThreadContext*>(tctx_base);
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if (tctx->detached || tctx->status != ThreadStatusFinished)
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2012-11-22 23:03:11 +01:00
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return;
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2013-11-04 22:33:31 +01:00
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for (uptr i = 0; i < leaks.Size(); i++) {
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if (leaks[i].tctx->creation_stack_id == tctx->creation_stack_id) {
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leaks[i].count++;
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return;
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}
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}
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ThreadLeak leak = {tctx, 1};
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leaks.PushBack(leak);
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}
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#endif
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2013-12-05 10:18:38 +01:00
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#ifndef TSAN_GO
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static void ReportIgnoresEnabled(ThreadContext *tctx, IgnoreSet *set) {
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if (tctx->tid == 0) {
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Printf("ThreadSanitizer: main thread finished with ignores enabled\n");
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} else {
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Printf("ThreadSanitizer: thread T%d %s finished with ignores enabled,"
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" created at:\n", tctx->tid, tctx->name);
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PrintStack(SymbolizeStackId(tctx->creation_stack_id));
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}
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Printf(" One of the following ignores was not ended"
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" (in order of probability)\n");
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for (uptr i = 0; i < set->Size(); i++) {
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Printf(" Ignore was enabled at:\n");
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PrintStack(SymbolizeStackId(set->At(i)));
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2013-11-04 22:33:31 +01:00
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}
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2013-12-05 10:18:38 +01:00
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Die();
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2012-11-22 23:03:11 +01:00
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}
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2013-12-05 10:18:38 +01:00
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static void ThreadCheckIgnore(ThreadState *thr) {
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2014-05-22 09:09:21 +02:00
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if (ctx->after_multithreaded_fork)
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return;
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2013-12-05 10:18:38 +01:00
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if (thr->ignore_reads_and_writes)
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ReportIgnoresEnabled(thr->tctx, &thr->mop_ignore_set);
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if (thr->ignore_sync)
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ReportIgnoresEnabled(thr->tctx, &thr->sync_ignore_set);
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}
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#else
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static void ThreadCheckIgnore(ThreadState *thr) {}
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#endif
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2012-11-22 23:03:11 +01:00
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void ThreadFinalize(ThreadState *thr) {
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2013-11-04 22:33:31 +01:00
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ThreadCheckIgnore(thr);
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#ifndef TSAN_GO
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2012-11-22 23:03:11 +01:00
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if (!flags()->report_thread_leaks)
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return;
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2014-05-22 09:09:21 +02:00
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ThreadRegistryLock l(ctx->thread_registry);
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2013-11-04 22:33:31 +01:00
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Vector<ThreadLeak> leaks(MBlockScopedBuf);
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2014-05-22 09:09:21 +02:00
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ctx->thread_registry->RunCallbackForEachThreadLocked(
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2013-11-04 22:33:31 +01:00
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MaybeReportThreadLeak, &leaks);
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for (uptr i = 0; i < leaks.Size(); i++) {
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ScopedReport rep(ReportTypeThreadLeak);
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rep.AddThread(leaks[i].tctx);
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rep.SetCount(leaks[i].count);
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2014-05-22 09:09:21 +02:00
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OutputReport(ctx, rep, rep.GetReport()->threads[0]->stack);
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2012-11-22 23:03:11 +01:00
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}
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2013-11-04 22:33:31 +01:00
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#endif
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2012-11-22 23:03:11 +01:00
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}
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2012-11-23 15:46:25 +01:00
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int ThreadCount(ThreadState *thr) {
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2013-11-04 22:33:31 +01:00
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uptr result;
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ctx->thread_registry->GetNumberOfThreads(0, 0, &result);
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return (int)result;
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2012-11-22 23:03:11 +01:00
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}
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int ThreadCreate(ThreadState *thr, uptr pc, uptr uid, bool detached) {
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StatInc(thr, StatThreadCreate);
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2013-11-04 22:33:31 +01:00
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OnCreatedArgs args = { thr, pc };
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int tid = ctx->thread_registry->CreateThread(uid, detached, thr->tid, &args);
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2012-11-22 23:03:11 +01:00
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DPrintf("#%d: ThreadCreate tid=%d uid=%zu\n", thr->tid, tid, uid);
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2013-11-04 22:33:31 +01:00
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StatSet(thr, StatThreadMaxAlive, ctx->thread_registry->GetMaxAliveThreads());
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2012-11-22 23:03:11 +01:00
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return tid;
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}
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void ThreadStart(ThreadState *thr, int tid, uptr os_id) {
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uptr stk_addr = 0;
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uptr stk_size = 0;
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uptr tls_addr = 0;
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uptr tls_size = 0;
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GetThreadStackAndTls(tid == 0, &stk_addr, &stk_size, &tls_addr, &tls_size);
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if (tid) {
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2013-11-04 22:33:31 +01:00
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if (stk_addr && stk_size)
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MemoryRangeImitateWrite(thr, /*pc=*/ 1, stk_addr, stk_size);
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2012-11-22 23:03:11 +01:00
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if (tls_addr && tls_size) {
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// Check that the thr object is in tls;
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const uptr thr_beg = (uptr)thr;
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const uptr thr_end = (uptr)thr + sizeof(*thr);
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CHECK_GE(thr_beg, tls_addr);
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CHECK_LE(thr_beg, tls_addr + tls_size);
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CHECK_GE(thr_end, tls_addr);
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CHECK_LE(thr_end, tls_addr + tls_size);
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// Since the thr object is huge, skip it.
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2013-11-04 22:33:31 +01:00
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MemoryRangeImitateWrite(thr, /*pc=*/ 2, tls_addr, thr_beg - tls_addr);
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MemoryRangeImitateWrite(thr, /*pc=*/ 2,
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thr_end, tls_addr + tls_size - thr_end);
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2012-11-22 23:03:11 +01:00
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}
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}
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2013-12-05 10:18:38 +01:00
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ThreadRegistry *tr = ctx->thread_registry;
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2013-11-04 22:33:31 +01:00
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OnStartedArgs args = { thr, stk_addr, stk_size, tls_addr, tls_size };
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2013-12-05 10:18:38 +01:00
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tr->StartThread(tid, os_id, &args);
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tr->Lock();
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thr->tctx = (ThreadContext*)tr->GetThreadLocked(tid);
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tr->Unlock();
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2014-05-22 09:09:21 +02:00
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#ifndef TSAN_GO
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if (ctx->after_multithreaded_fork) {
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thr->ignore_interceptors++;
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ThreadIgnoreBegin(thr, 0);
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ThreadIgnoreSyncBegin(thr, 0);
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}
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#endif
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2012-11-22 23:03:11 +01:00
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}
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void ThreadFinish(ThreadState *thr) {
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2013-11-04 22:33:31 +01:00
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ThreadCheckIgnore(thr);
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2012-11-22 23:03:11 +01:00
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StatInc(thr, StatThreadFinish);
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if (thr->stk_addr && thr->stk_size)
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2013-11-04 22:33:31 +01:00
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DontNeedShadowFor(thr->stk_addr, thr->stk_size);
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if (thr->tls_addr && thr->tls_size)
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DontNeedShadowFor(thr->tls_addr, thr->tls_size);
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2012-11-22 23:03:11 +01:00
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thr->is_alive = false;
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2013-11-04 22:33:31 +01:00
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ctx->thread_registry->FinishThread(thr->tid);
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}
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2012-11-22 23:03:11 +01:00
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2013-11-04 22:33:31 +01:00
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static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
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uptr uid = (uptr)arg;
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if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
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tctx->user_id = 0;
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return true;
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2012-11-22 23:03:11 +01:00
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}
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2013-11-04 22:33:31 +01:00
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return false;
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2012-11-22 23:03:11 +01:00
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}
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int ThreadTid(ThreadState *thr, uptr pc, uptr uid) {
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2013-11-04 22:33:31 +01:00
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int res = ctx->thread_registry->FindThread(FindThreadByUid, (void*)uid);
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2012-11-22 23:03:11 +01:00
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DPrintf("#%d: ThreadTid uid=%zu tid=%d\n", thr->tid, uid, res);
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return res;
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}
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void ThreadJoin(ThreadState *thr, uptr pc, int tid) {
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CHECK_GT(tid, 0);
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CHECK_LT(tid, kMaxTid);
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|
DPrintf("#%d: ThreadJoin tid=%d\n", thr->tid, tid);
|
2013-11-04 22:33:31 +01:00
|
|
|
ctx->thread_registry->JoinThread(tid, thr);
|
2012-11-22 23:03:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
void ThreadDetach(ThreadState *thr, uptr pc, int tid) {
|
|
|
|
CHECK_GT(tid, 0);
|
|
|
|
CHECK_LT(tid, kMaxTid);
|
2013-11-04 22:33:31 +01:00
|
|
|
ctx->thread_registry->DetachThread(tid);
|
2012-11-22 23:03:11 +01:00
|
|
|
}
|
|
|
|
|
2012-12-05 14:19:55 +01:00
|
|
|
void ThreadSetName(ThreadState *thr, const char *name) {
|
2014-05-22 09:09:21 +02:00
|
|
|
ctx->thread_registry->SetThreadName(thr->tid, name);
|
2012-12-05 14:19:55 +01:00
|
|
|
}
|
|
|
|
|
2012-11-22 23:03:11 +01:00
|
|
|
void MemoryAccessRange(ThreadState *thr, uptr pc, uptr addr,
|
|
|
|
uptr size, bool is_write) {
|
|
|
|
if (size == 0)
|
|
|
|
return;
|
|
|
|
|
|
|
|
u64 *shadow_mem = (u64*)MemToShadow(addr);
|
|
|
|
DPrintf2("#%d: MemoryAccessRange: @%p %p size=%d is_write=%d\n",
|
|
|
|
thr->tid, (void*)pc, (void*)addr,
|
|
|
|
(int)size, is_write);
|
|
|
|
|
|
|
|
#if TSAN_DEBUG
|
|
|
|
if (!IsAppMem(addr)) {
|
2012-11-23 15:46:25 +01:00
|
|
|
Printf("Access to non app mem %zx\n", addr);
|
2012-11-22 23:03:11 +01:00
|
|
|
DCHECK(IsAppMem(addr));
|
|
|
|
}
|
|
|
|
if (!IsAppMem(addr + size - 1)) {
|
2012-11-23 15:46:25 +01:00
|
|
|
Printf("Access to non app mem %zx\n", addr + size - 1);
|
2012-11-22 23:03:11 +01:00
|
|
|
DCHECK(IsAppMem(addr + size - 1));
|
|
|
|
}
|
|
|
|
if (!IsShadowMem((uptr)shadow_mem)) {
|
2012-11-23 15:46:25 +01:00
|
|
|
Printf("Bad shadow addr %p (%zx)\n", shadow_mem, addr);
|
2012-11-22 23:03:11 +01:00
|
|
|
DCHECK(IsShadowMem((uptr)shadow_mem));
|
|
|
|
}
|
|
|
|
if (!IsShadowMem((uptr)(shadow_mem + size * kShadowCnt / 8 - 1))) {
|
2012-11-23 15:46:25 +01:00
|
|
|
Printf("Bad shadow addr %p (%zx)\n",
|
2012-11-22 23:03:11 +01:00
|
|
|
shadow_mem + size * kShadowCnt / 8 - 1, addr + size - 1);
|
|
|
|
DCHECK(IsShadowMem((uptr)(shadow_mem + size * kShadowCnt / 8 - 1)));
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
StatInc(thr, StatMopRange);
|
|
|
|
|
2013-11-04 22:33:31 +01:00
|
|
|
if (*shadow_mem == kShadowRodata) {
|
|
|
|
// Access to .rodata section, no races here.
|
|
|
|
// Measurements show that it can be 10-20% of all memory accesses.
|
|
|
|
StatInc(thr, StatMopRangeRodata);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2012-11-22 23:03:11 +01:00
|
|
|
FastState fast_state = thr->fast_state;
|
|
|
|
if (fast_state.GetIgnoreBit())
|
|
|
|
return;
|
|
|
|
|
|
|
|
fast_state.IncrementEpoch();
|
|
|
|
thr->fast_state = fast_state;
|
2012-12-05 14:19:55 +01:00
|
|
|
TraceAddEvent(thr, fast_state, EventTypeMop, pc);
|
2012-11-22 23:03:11 +01:00
|
|
|
|
|
|
|
bool unaligned = (addr % kShadowCell) != 0;
|
|
|
|
|
|
|
|
// Handle unaligned beginning, if any.
|
|
|
|
for (; addr % kShadowCell && size; addr++, size--) {
|
|
|
|
int const kAccessSizeLog = 0;
|
|
|
|
Shadow cur(fast_state);
|
|
|
|
cur.SetWrite(is_write);
|
|
|
|
cur.SetAddr0AndSizeLog(addr & (kShadowCell - 1), kAccessSizeLog);
|
2013-02-13 11:46:01 +01:00
|
|
|
MemoryAccessImpl(thr, addr, kAccessSizeLog, is_write, false,
|
2012-11-22 23:03:11 +01:00
|
|
|
shadow_mem, cur);
|
|
|
|
}
|
|
|
|
if (unaligned)
|
|
|
|
shadow_mem += kShadowCnt;
|
|
|
|
// Handle middle part, if any.
|
|
|
|
for (; size >= kShadowCell; addr += kShadowCell, size -= kShadowCell) {
|
|
|
|
int const kAccessSizeLog = 3;
|
|
|
|
Shadow cur(fast_state);
|
|
|
|
cur.SetWrite(is_write);
|
|
|
|
cur.SetAddr0AndSizeLog(0, kAccessSizeLog);
|
2013-02-13 11:46:01 +01:00
|
|
|
MemoryAccessImpl(thr, addr, kAccessSizeLog, is_write, false,
|
2012-11-22 23:03:11 +01:00
|
|
|
shadow_mem, cur);
|
|
|
|
shadow_mem += kShadowCnt;
|
|
|
|
}
|
|
|
|
// Handle ending, if any.
|
|
|
|
for (; size; addr++, size--) {
|
|
|
|
int const kAccessSizeLog = 0;
|
|
|
|
Shadow cur(fast_state);
|
|
|
|
cur.SetWrite(is_write);
|
|
|
|
cur.SetAddr0AndSizeLog(addr & (kShadowCell - 1), kAccessSizeLog);
|
2013-02-13 11:46:01 +01:00
|
|
|
MemoryAccessImpl(thr, addr, kAccessSizeLog, is_write, false,
|
2012-11-22 23:03:11 +01:00
|
|
|
shadow_mem, cur);
|
|
|
|
}
|
|
|
|
}
|
2013-02-21 11:57:10 +01:00
|
|
|
|
2012-11-22 23:03:11 +01:00
|
|
|
} // namespace __tsan
|