400 lines
12 KiB
C++
400 lines
12 KiB
C++
//===-- 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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// 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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#if !SANITIZER_GO
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ThreadContext::~ThreadContext() {
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}
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#endif
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void ThreadContext::OnDead() {
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CHECK_EQ(sync.size(), 0);
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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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AcquireImpl(caller_thr, 0, &sync);
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sync.Reset(&caller_thr->proc()->clock_cache);
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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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return;
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OnCreatedArgs *args = static_cast<OnCreatedArgs *>(arg);
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if (!args->thr) // GCD workers don't have a parent thread.
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return;
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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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ReleaseImpl(args->thr, 0, &sync);
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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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CHECK_EQ(sync.size(), 0);
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uptr trace_p = GetThreadTrace(tid);
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ReleaseMemoryPagesToOS(trace_p, trace_p + TraceSize() * sizeof(Event));
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//!!! ReleaseMemoryToOS(GetThreadTraceHeader(tid), sizeof(Trace));
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}
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void ThreadContext::OnDetached(void *arg) {
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ThreadState *thr1 = static_cast<ThreadState*>(arg);
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sync.Reset(&thr1->proc()->clock_cache);
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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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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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#if !SANITIZER_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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// Setup dynamic shadow stack.
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const int kInitStackSize = 8;
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thr->shadow_stack = (uptr*)internal_alloc(MBlockShadowStack,
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kInitStackSize * sizeof(uptr));
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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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#endif
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if (common_flags()->detect_deadlocks)
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thr->dd_lt = ctx->dd->CreateLogicalThread(unique_id);
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thr->fast_state.SetHistorySize(flags()->history_size);
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// Commit switch to the new part of the trace.
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// TraceAddEvent will reset stack0/mset0 in the new part for us.
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TraceAddEvent(thr, thr->fast_state, EventTypeMop, 0);
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thr->fast_synch_epoch = epoch0;
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AcquireImpl(thr, 0, &sync);
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StatInc(thr, StatSyncAcquire);
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sync.Reset(&thr->proc()->clock_cache);
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thr->is_inited = true;
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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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}
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void ThreadContext::OnFinished() {
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#if SANITIZER_GO
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internal_free(thr->shadow_stack);
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thr->shadow_stack = nullptr;
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thr->shadow_stack_pos = nullptr;
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thr->shadow_stack_end = nullptr;
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#endif
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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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ReleaseImpl(thr, 0, &sync);
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}
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epoch1 = thr->fast_state.epoch();
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if (common_flags()->detect_deadlocks)
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ctx->dd->DestroyLogicalThread(thr->dd_lt);
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thr->clock.ResetCached(&thr->proc()->clock_cache);
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#if !SANITIZER_GO
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thr->last_sleep_clock.ResetCached(&thr->proc()->clock_cache);
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#endif
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thr->~ThreadState();
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#if TSAN_COLLECT_STATS
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StatAggregate(ctx->stat, thr->stat);
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#endif
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thr = 0;
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}
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#if !SANITIZER_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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return;
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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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#if !SANITIZER_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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}
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Die();
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}
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static void ThreadCheckIgnore(ThreadState *thr) {
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if (ctx->after_multithreaded_fork)
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return;
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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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void ThreadFinalize(ThreadState *thr) {
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ThreadCheckIgnore(thr);
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#if !SANITIZER_GO
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if (!flags()->report_thread_leaks)
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return;
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ThreadRegistryLock l(ctx->thread_registry);
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Vector<ThreadLeak> leaks;
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ctx->thread_registry->RunCallbackForEachThreadLocked(
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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, true);
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rep.SetCount(leaks[i].count);
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OutputReport(thr, rep);
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}
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#endif
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}
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int ThreadCount(ThreadState *thr) {
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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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}
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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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OnCreatedArgs args = { thr, pc };
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u32 parent_tid = thr ? thr->tid : kInvalidTid; // No parent for GCD workers.
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int tid =
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ctx->thread_registry->CreateThread(uid, detached, parent_tid, &args);
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DPrintf("#%d: ThreadCreate tid=%d uid=%zu\n", parent_tid, tid, uid);
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StatSet(thr, StatThreadMaxAlive, ctx->thread_registry->GetMaxAliveThreads());
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return tid;
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}
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void ThreadStart(ThreadState *thr, int tid, tid_t os_id, bool workerthread) {
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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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#if !SANITIZER_GO
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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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if (stk_addr && stk_size)
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MemoryRangeImitateWrite(thr, /*pc=*/ 1, stk_addr, stk_size);
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if (tls_addr && tls_size) ImitateTlsWrite(thr, tls_addr, tls_size);
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}
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#endif
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ThreadRegistry *tr = ctx->thread_registry;
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OnStartedArgs args = { thr, stk_addr, stk_size, tls_addr, tls_size };
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tr->StartThread(tid, os_id, workerthread, &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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#if !SANITIZER_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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}
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void ThreadFinish(ThreadState *thr) {
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ThreadCheckIgnore(thr);
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StatInc(thr, StatThreadFinish);
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if (thr->stk_addr && thr->stk_size)
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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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thr->is_dead = true;
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ctx->thread_registry->FinishThread(thr->tid);
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}
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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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}
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return false;
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}
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int ThreadTid(ThreadState *thr, uptr pc, uptr uid) {
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int res = ctx->thread_registry->FindThread(FindThreadByUid, (void*)uid);
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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);
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ctx->thread_registry->JoinThread(tid, thr);
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}
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void ThreadDetach(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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ctx->thread_registry->DetachThread(tid, thr);
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}
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void ThreadSetName(ThreadState *thr, const char *name) {
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ctx->thread_registry->SetThreadName(thr->tid, name);
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}
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void MemoryAccessRange(ThreadState *thr, uptr pc, uptr addr,
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uptr size, bool is_write) {
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if (size == 0)
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return;
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u64 *shadow_mem = (u64*)MemToShadow(addr);
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DPrintf2("#%d: MemoryAccessRange: @%p %p size=%d is_write=%d\n",
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thr->tid, (void*)pc, (void*)addr,
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(int)size, is_write);
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#if SANITIZER_DEBUG
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if (!IsAppMem(addr)) {
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Printf("Access to non app mem %zx\n", addr);
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DCHECK(IsAppMem(addr));
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}
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if (!IsAppMem(addr + size - 1)) {
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Printf("Access to non app mem %zx\n", addr + size - 1);
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DCHECK(IsAppMem(addr + size - 1));
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}
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if (!IsShadowMem((uptr)shadow_mem)) {
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Printf("Bad shadow addr %p (%zx)\n", shadow_mem, addr);
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DCHECK(IsShadowMem((uptr)shadow_mem));
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}
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if (!IsShadowMem((uptr)(shadow_mem + size * kShadowCnt / 8 - 1))) {
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Printf("Bad shadow addr %p (%zx)\n",
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shadow_mem + size * kShadowCnt / 8 - 1, addr + size - 1);
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DCHECK(IsShadowMem((uptr)(shadow_mem + size * kShadowCnt / 8 - 1)));
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}
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#endif
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StatInc(thr, StatMopRange);
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if (*shadow_mem == kShadowRodata) {
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DCHECK(!is_write);
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// Access to .rodata section, no races here.
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// Measurements show that it can be 10-20% of all memory accesses.
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StatInc(thr, StatMopRangeRodata);
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return;
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}
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FastState fast_state = thr->fast_state;
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if (fast_state.GetIgnoreBit())
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return;
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fast_state.IncrementEpoch();
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thr->fast_state = fast_state;
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TraceAddEvent(thr, fast_state, EventTypeMop, pc);
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bool unaligned = (addr % kShadowCell) != 0;
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// Handle unaligned beginning, if any.
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for (; addr % kShadowCell && size; addr++, size--) {
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int const kAccessSizeLog = 0;
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Shadow cur(fast_state);
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cur.SetWrite(is_write);
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cur.SetAddr0AndSizeLog(addr & (kShadowCell - 1), kAccessSizeLog);
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MemoryAccessImpl(thr, addr, kAccessSizeLog, is_write, false,
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shadow_mem, cur);
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}
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if (unaligned)
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shadow_mem += kShadowCnt;
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// Handle middle part, if any.
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for (; size >= kShadowCell; addr += kShadowCell, size -= kShadowCell) {
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int const kAccessSizeLog = 3;
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Shadow cur(fast_state);
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cur.SetWrite(is_write);
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cur.SetAddr0AndSizeLog(0, kAccessSizeLog);
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MemoryAccessImpl(thr, addr, kAccessSizeLog, is_write, false,
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shadow_mem, cur);
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shadow_mem += kShadowCnt;
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}
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// Handle ending, if any.
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for (; size; addr++, size--) {
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int const kAccessSizeLog = 0;
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Shadow cur(fast_state);
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cur.SetWrite(is_write);
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cur.SetAddr0AndSizeLog(addr & (kShadowCell - 1), kAccessSizeLog);
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MemoryAccessImpl(thr, addr, kAccessSizeLog, is_write, false,
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shadow_mem, cur);
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}
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}
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} // namespace __tsan
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