2012-11-22 23:03:11 +01:00
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//===-- tsan_rtl.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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// Main file (entry points) for the TSan run-time.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_atomic.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_stackdepot.h"
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#include "sanitizer_common/sanitizer_placement_new.h"
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#include "sanitizer_common/sanitizer_symbolizer.h"
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#include "tsan_defs.h"
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#include "tsan_platform.h"
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#include "tsan_rtl.h"
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#include "tsan_mman.h"
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#include "tsan_suppressions.h"
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2013-11-04 22:33:31 +01:00
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#include "tsan_symbolize.h"
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2012-11-22 23:03:11 +01:00
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volatile int __tsan_resumed = 0;
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extern "C" void __tsan_resume() {
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__tsan_resumed = 1;
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}
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namespace __tsan {
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#ifndef TSAN_GO
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THREADLOCAL char cur_thread_placeholder[sizeof(ThreadState)] ALIGNED(64);
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#endif
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static char ctx_placeholder[sizeof(Context)] ALIGNED(64);
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2014-05-22 09:09:21 +02:00
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Context *ctx;
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2012-11-22 23:03:11 +01:00
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2013-02-13 11:46:01 +01:00
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// Can be overriden by a front-end.
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2013-12-05 10:18:38 +01:00
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#ifdef TSAN_EXTERNAL_HOOKS
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bool OnFinalize(bool failed);
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2014-05-22 09:09:21 +02:00
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void OnInitialize();
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2013-12-05 10:18:38 +01:00
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#else
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2014-02-04 11:46:22 +01:00
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SANITIZER_INTERFACE_ATTRIBUTE
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2013-12-05 10:18:38 +01:00
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bool WEAK OnFinalize(bool failed) {
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2013-02-13 11:46:01 +01:00
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return failed;
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}
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2014-05-22 09:09:21 +02:00
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SANITIZER_INTERFACE_ATTRIBUTE
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void WEAK OnInitialize() {}
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2013-12-05 10:18:38 +01:00
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#endif
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2013-02-13 11:46:01 +01:00
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2013-11-04 22:33:31 +01:00
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static char thread_registry_placeholder[sizeof(ThreadRegistry)];
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static ThreadContextBase *CreateThreadContext(u32 tid) {
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// Map thread trace when context is created.
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MapThreadTrace(GetThreadTrace(tid), TraceSize() * sizeof(Event));
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MapThreadTrace(GetThreadTraceHeader(tid), sizeof(Trace));
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new(ThreadTrace(tid)) Trace();
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void *mem = internal_alloc(MBlockThreadContex, sizeof(ThreadContext));
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return new(mem) ThreadContext(tid);
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}
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#ifndef TSAN_GO
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static const u32 kThreadQuarantineSize = 16;
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#else
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static const u32 kThreadQuarantineSize = 64;
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#endif
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2012-11-22 23:03:11 +01:00
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Context::Context()
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: initialized()
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, report_mtx(MutexTypeReport, StatMtxReport)
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, nreported()
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, nmissed_expected()
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2013-11-04 22:33:31 +01:00
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, thread_registry(new(thread_registry_placeholder) ThreadRegistry(
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2014-05-22 09:09:21 +02:00
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CreateThreadContext, kMaxTid, kThreadQuarantineSize, kMaxTidReuse))
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2012-11-22 23:03:11 +01:00
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, racy_stacks(MBlockRacyStacks)
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, racy_addresses(MBlockRacyAddresses)
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2013-11-04 22:33:31 +01:00
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, fired_suppressions(8) {
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2012-11-22 23:03:11 +01:00
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}
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// The objects are allocated in TLS, so one may rely on zero-initialization.
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ThreadState::ThreadState(Context *ctx, int tid, int unique_id, u64 epoch,
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2014-05-22 09:09:21 +02:00
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unsigned reuse_count,
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2012-11-22 23:03:11 +01:00
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uptr stk_addr, uptr stk_size,
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uptr tls_addr, uptr tls_size)
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: fast_state(tid, epoch)
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// Do not touch these, rely on zero initialization,
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// they may be accessed before the ctor.
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2013-11-04 22:33:31 +01:00
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// , ignore_reads_and_writes()
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2014-05-22 09:09:21 +02:00
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// , ignore_interceptors()
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, clock(tid, reuse_count)
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2013-11-04 22:33:31 +01:00
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#ifndef TSAN_GO
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, jmp_bufs(MBlockJmpBuf)
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#endif
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2012-11-22 23:03:11 +01:00
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, tid(tid)
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, unique_id(unique_id)
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, stk_addr(stk_addr)
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, stk_size(stk_size)
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, tls_addr(tls_addr)
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2014-05-22 09:09:21 +02:00
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, tls_size(tls_size)
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#ifndef TSAN_GO
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, last_sleep_clock(tid)
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#endif
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{
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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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static void MemoryProfiler(Context *ctx, fd_t fd, int i) {
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uptr n_threads;
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uptr n_running_threads;
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ctx->thread_registry->GetNumberOfThreads(&n_threads, &n_running_threads);
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InternalScopedBuffer<char> buf(4096);
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internal_snprintf(buf.data(), buf.size(), "%d: nthr=%d nlive=%d\n",
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i, n_threads, n_running_threads);
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internal_write(fd, buf.data(), internal_strlen(buf.data()));
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WriteMemoryProfile(buf.data(), buf.size());
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internal_write(fd, buf.data(), internal_strlen(buf.data()));
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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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static void BackgroundThread(void *arg) {
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2014-05-22 09:09:21 +02:00
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#ifndef TSAN_GO
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// This is a non-initialized non-user thread, nothing to see here.
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// We don't use ScopedIgnoreInterceptors, because we want ignores to be
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// enabled even when the thread function exits (e.g. during pthread thread
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// shutdown code).
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cur_thread()->ignore_interceptors++;
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#endif
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2013-11-04 22:33:31 +01:00
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const u64 kMs2Ns = 1000 * 1000;
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fd_t mprof_fd = kInvalidFd;
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if (flags()->profile_memory && flags()->profile_memory[0]) {
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InternalScopedBuffer<char> filename(4096);
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internal_snprintf(filename.data(), filename.size(), "%s.%d",
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flags()->profile_memory, (int)internal_getpid());
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uptr openrv = OpenFile(filename.data(), true);
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if (internal_iserror(openrv)) {
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Printf("ThreadSanitizer: failed to open memory profile file '%s'\n",
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&filename[0]);
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} else {
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mprof_fd = openrv;
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}
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}
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u64 last_flush = NanoTime();
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2013-12-05 10:18:38 +01:00
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uptr last_rss = 0;
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2014-05-22 09:09:21 +02:00
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for (int i = 0;
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atomic_load(&ctx->stop_background_thread, memory_order_relaxed) == 0;
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i++) {
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SleepForMillis(100);
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2013-11-04 22:33:31 +01:00
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u64 now = NanoTime();
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// Flush memory if requested.
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2013-12-05 10:18:38 +01:00
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if (flags()->flush_memory_ms > 0) {
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2013-11-04 22:33:31 +01:00
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if (last_flush + flags()->flush_memory_ms * kMs2Ns < now) {
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2013-12-05 10:18:38 +01:00
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if (flags()->verbosity > 0)
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Printf("ThreadSanitizer: periodic memory flush\n");
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2013-11-04 22:33:31 +01:00
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FlushShadowMemory();
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last_flush = NanoTime();
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}
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}
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2013-12-05 10:18:38 +01:00
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if (flags()->memory_limit_mb > 0) {
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uptr rss = GetRSS();
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uptr limit = uptr(flags()->memory_limit_mb) << 20;
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if (flags()->verbosity > 0) {
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Printf("ThreadSanitizer: memory flush check"
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" RSS=%llu LAST=%llu LIMIT=%llu\n",
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(u64)rss>>20, (u64)last_rss>>20, (u64)limit>>20);
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}
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if (2 * rss > limit + last_rss) {
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if (flags()->verbosity > 0)
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Printf("ThreadSanitizer: flushing memory due to RSS\n");
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FlushShadowMemory();
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rss = GetRSS();
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if (flags()->verbosity > 0)
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Printf("ThreadSanitizer: memory flushed RSS=%llu\n", (u64)rss>>20);
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}
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last_rss = rss;
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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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// Write memory profile if requested.
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if (mprof_fd != kInvalidFd)
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MemoryProfiler(ctx, mprof_fd, i);
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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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#ifndef TSAN_GO
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// Flush symbolizer cache if requested.
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if (flags()->flush_symbolizer_ms > 0) {
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u64 last = atomic_load(&ctx->last_symbolize_time_ns,
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memory_order_relaxed);
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if (last != 0 && last + flags()->flush_symbolizer_ms * kMs2Ns < now) {
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Lock l(&ctx->report_mtx);
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SpinMutexLock l2(&CommonSanitizerReportMutex);
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SymbolizeFlush();
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atomic_store(&ctx->last_symbolize_time_ns, 0, memory_order_relaxed);
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}
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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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}
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2014-05-22 09:09:21 +02:00
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static void StartBackgroundThread() {
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ctx->background_thread = internal_start_thread(&BackgroundThread, 0);
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}
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static void StopBackgroundThread() {
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atomic_store(&ctx->stop_background_thread, 1, memory_order_relaxed);
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internal_join_thread(ctx->background_thread);
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ctx->background_thread = 0;
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}
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2013-11-04 22:33:31 +01:00
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void DontNeedShadowFor(uptr addr, uptr size) {
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uptr shadow_beg = MemToShadow(addr);
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uptr shadow_end = MemToShadow(addr + size);
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FlushUnneededShadowMemory(shadow_beg, shadow_end - shadow_beg);
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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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void MapShadow(uptr addr, uptr size) {
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2014-05-22 09:09:21 +02:00
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// Global data is not 64K aligned, but there are no adjacent mappings,
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// so we can get away with unaligned mapping.
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// CHECK_EQ(addr, addr & ~((64 << 10) - 1)); // windows wants 64K alignment
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2012-11-23 15:46:25 +01:00
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MmapFixedNoReserve(MemToShadow(addr), size * kShadowMultiplier);
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}
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2013-01-10 13:44:08 +01:00
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void MapThreadTrace(uptr addr, uptr size) {
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DPrintf("#0: Mapping trace at %p-%p(0x%zx)\n", addr, addr + size, size);
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CHECK_GE(addr, kTraceMemBegin);
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CHECK_LE(addr + size, kTraceMemBegin + kTraceMemSize);
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2014-05-22 09:09:21 +02:00
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CHECK_EQ(addr, addr & ~((64 << 10) - 1)); // windows wants 64K alignment
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2013-12-05 10:18:38 +01:00
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uptr addr1 = (uptr)MmapFixedNoReserve(addr, size);
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if (addr1 != addr) {
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Printf("FATAL: ThreadSanitizer can not mmap thread trace (%p/%p->%p)\n",
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addr, size, addr1);
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2013-01-10 13:44:08 +01:00
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Die();
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}
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}
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2012-11-22 23:03:11 +01:00
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void Initialize(ThreadState *thr) {
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// Thread safe because done before all threads exist.
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static bool is_initialized = false;
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if (is_initialized)
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return;
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is_initialized = true;
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2014-05-22 09:09:21 +02:00
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// We are not ready to handle interceptors yet.
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ScopedIgnoreInterceptors ignore;
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2013-02-13 11:46:01 +01:00
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SanitizerToolName = "ThreadSanitizer";
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2012-11-22 23:03:11 +01:00
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// Install tool-specific callbacks in sanitizer_common.
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SetCheckFailedCallback(TsanCheckFailed);
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#ifndef TSAN_GO
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InitializeAllocator();
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#endif
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InitializeInterceptors();
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const char *env = InitializePlatform();
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InitializeMutex();
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InitializeDynamicAnnotations();
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ctx = new(ctx_placeholder) Context;
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2012-11-23 15:46:25 +01:00
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#ifndef TSAN_GO
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2012-11-22 23:03:11 +01:00
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InitializeShadowMemory();
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2012-11-23 15:46:25 +01:00
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#endif
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2012-11-22 23:03:11 +01:00
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InitializeFlags(&ctx->flags, env);
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2012-11-23 15:46:25 +01:00
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// Setup correct file descriptor for error reports.
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2013-12-05 10:18:38 +01:00
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__sanitizer_set_report_path(flags()->log_path);
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2012-11-22 23:03:11 +01:00
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InitializeSuppressions();
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#ifndef TSAN_GO
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2013-12-05 10:18:38 +01:00
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InitializeLibIgnore();
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2014-05-22 09:09:21 +02:00
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Symbolizer::Init(common_flags()->external_symbolizer_path);
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2013-12-05 10:18:38 +01:00
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Symbolizer::Get()->AddHooks(EnterSymbolizer, ExitSymbolizer);
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2012-11-22 23:03:11 +01:00
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#endif
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2014-05-22 09:09:21 +02:00
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StartBackgroundThread();
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SetSandboxingCallback(StopBackgroundThread);
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if (flags()->detect_deadlocks)
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ctx->dd = DDetector::Create(flags());
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2012-11-22 23:03:11 +01:00
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if (ctx->flags.verbosity)
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2012-11-23 15:46:25 +01:00
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Printf("***** Running under ThreadSanitizer v2 (pid %d) *****\n",
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2013-11-04 22:33:31 +01:00
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(int)internal_getpid());
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2012-11-22 23:03:11 +01:00
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// Initialize thread 0.
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int tid = ThreadCreate(thr, 0, 0, true);
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CHECK_EQ(tid, 0);
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2013-11-04 22:33:31 +01:00
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ThreadStart(thr, tid, internal_getpid());
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2012-11-22 23:03:11 +01:00
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ctx->initialized = true;
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if (flags()->stop_on_start) {
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2012-11-23 15:46:25 +01:00
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Printf("ThreadSanitizer is suspended at startup (pid %d)."
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2012-11-22 23:03:11 +01:00
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" Call __tsan_resume().\n",
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2013-11-04 22:33:31 +01:00
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(int)internal_getpid());
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2013-02-13 11:46:01 +01:00
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while (__tsan_resumed == 0) {}
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2012-11-22 23:03:11 +01:00
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}
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2014-05-22 09:09:21 +02:00
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OnInitialize();
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2012-11-22 23:03:11 +01:00
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}
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int Finalize(ThreadState *thr) {
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Context *ctx = __tsan::ctx;
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bool failed = false;
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2012-11-23 15:46:25 +01:00
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if (flags()->atexit_sleep_ms > 0 && ThreadCount(thr) > 1)
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|
|
SleepForMillis(flags()->atexit_sleep_ms);
|
|
|
|
|
2012-11-22 23:03:11 +01:00
|
|
|
// Wait for pending reports.
|
|
|
|
ctx->report_mtx.Lock();
|
2013-11-04 22:33:31 +01:00
|
|
|
CommonSanitizerReportMutex.Lock();
|
|
|
|
CommonSanitizerReportMutex.Unlock();
|
2012-11-22 23:03:11 +01:00
|
|
|
ctx->report_mtx.Unlock();
|
|
|
|
|
2013-02-13 11:46:01 +01:00
|
|
|
#ifndef TSAN_GO
|
|
|
|
if (ctx->flags.verbosity)
|
|
|
|
AllocatorPrintStats();
|
|
|
|
#endif
|
|
|
|
|
2012-11-22 23:03:11 +01:00
|
|
|
ThreadFinalize(thr);
|
|
|
|
|
|
|
|
if (ctx->nreported) {
|
|
|
|
failed = true;
|
2012-11-23 15:46:25 +01:00
|
|
|
#ifndef TSAN_GO
|
|
|
|
Printf("ThreadSanitizer: reported %d warnings\n", ctx->nreported);
|
|
|
|
#else
|
|
|
|
Printf("Found %d data race(s)\n", ctx->nreported);
|
|
|
|
#endif
|
2012-11-22 23:03:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
if (ctx->nmissed_expected) {
|
|
|
|
failed = true;
|
2012-11-23 15:46:25 +01:00
|
|
|
Printf("ThreadSanitizer: missed %d expected races\n",
|
2012-11-22 23:03:11 +01:00
|
|
|
ctx->nmissed_expected);
|
|
|
|
}
|
|
|
|
|
2013-11-04 22:33:31 +01:00
|
|
|
if (flags()->print_suppressions)
|
|
|
|
PrintMatchedSuppressions();
|
|
|
|
#ifndef TSAN_GO
|
|
|
|
if (flags()->print_benign)
|
|
|
|
PrintMatchedBenignRaces();
|
|
|
|
#endif
|
|
|
|
|
2013-02-13 11:46:01 +01:00
|
|
|
failed = OnFinalize(failed);
|
|
|
|
|
2012-11-23 15:46:25 +01:00
|
|
|
StatAggregate(ctx->stat, thr->stat);
|
2012-11-22 23:03:11 +01:00
|
|
|
StatOutput(ctx->stat);
|
|
|
|
return failed ? flags()->exitcode : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifndef TSAN_GO
|
2014-05-22 09:09:21 +02:00
|
|
|
void ForkBefore(ThreadState *thr, uptr pc) {
|
|
|
|
ctx->thread_registry->Lock();
|
|
|
|
ctx->report_mtx.Lock();
|
|
|
|
}
|
|
|
|
|
|
|
|
void ForkParentAfter(ThreadState *thr, uptr pc) {
|
|
|
|
ctx->report_mtx.Unlock();
|
|
|
|
ctx->thread_registry->Unlock();
|
|
|
|
}
|
|
|
|
|
|
|
|
void ForkChildAfter(ThreadState *thr, uptr pc) {
|
|
|
|
ctx->report_mtx.Unlock();
|
|
|
|
ctx->thread_registry->Unlock();
|
|
|
|
|
|
|
|
uptr nthread = 0;
|
|
|
|
ctx->thread_registry->GetNumberOfThreads(0, 0, &nthread /* alive threads */);
|
|
|
|
VPrintf(1, "ThreadSanitizer: forked new process with pid %d,"
|
|
|
|
" parent had %d threads\n", (int)internal_getpid(), (int)nthread);
|
|
|
|
if (nthread == 1) {
|
|
|
|
internal_start_thread(&BackgroundThread, 0);
|
|
|
|
} else {
|
|
|
|
// We've just forked a multi-threaded process. We cannot reasonably function
|
|
|
|
// after that (some mutexes may be locked before fork). So just enable
|
|
|
|
// ignores for everything in the hope that we will exec soon.
|
|
|
|
ctx->after_multithreaded_fork = true;
|
|
|
|
thr->ignore_interceptors++;
|
|
|
|
ThreadIgnoreBegin(thr, pc);
|
|
|
|
ThreadIgnoreSyncBegin(thr, pc);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2012-11-22 23:03:11 +01:00
|
|
|
u32 CurrentStackId(ThreadState *thr, uptr pc) {
|
|
|
|
if (thr->shadow_stack_pos == 0) // May happen during bootstrap.
|
|
|
|
return 0;
|
|
|
|
if (pc) {
|
|
|
|
thr->shadow_stack_pos[0] = pc;
|
|
|
|
thr->shadow_stack_pos++;
|
|
|
|
}
|
|
|
|
u32 id = StackDepotPut(thr->shadow_stack,
|
|
|
|
thr->shadow_stack_pos - thr->shadow_stack);
|
|
|
|
if (pc)
|
|
|
|
thr->shadow_stack_pos--;
|
|
|
|
return id;
|
|
|
|
}
|
|
|
|
|
|
|
|
void TraceSwitch(ThreadState *thr) {
|
|
|
|
thr->nomalloc++;
|
2013-11-04 22:33:31 +01:00
|
|
|
Trace *thr_trace = ThreadTrace(thr->tid);
|
|
|
|
Lock l(&thr_trace->mtx);
|
2012-12-05 14:19:55 +01:00
|
|
|
unsigned trace = (thr->fast_state.epoch() / kTracePartSize) % TraceParts();
|
2013-11-04 22:33:31 +01:00
|
|
|
TraceHeader *hdr = &thr_trace->headers[trace];
|
2012-11-22 23:03:11 +01:00
|
|
|
hdr->epoch0 = thr->fast_state.epoch();
|
|
|
|
hdr->stack0.ObtainCurrent(thr, 0);
|
2013-01-10 13:44:08 +01:00
|
|
|
hdr->mset0 = thr->mset;
|
2012-11-22 23:03:11 +01:00
|
|
|
thr->nomalloc--;
|
|
|
|
}
|
|
|
|
|
2013-11-04 22:33:31 +01:00
|
|
|
Trace *ThreadTrace(int tid) {
|
|
|
|
return (Trace*)GetThreadTraceHeader(tid);
|
|
|
|
}
|
|
|
|
|
2012-12-05 14:19:55 +01:00
|
|
|
uptr TraceTopPC(ThreadState *thr) {
|
|
|
|
Event *events = (Event*)GetThreadTrace(thr->tid);
|
|
|
|
uptr pc = events[thr->fast_state.GetTracePos()];
|
|
|
|
return pc;
|
|
|
|
}
|
|
|
|
|
|
|
|
uptr TraceSize() {
|
|
|
|
return (uptr)(1ull << (kTracePartSizeBits + flags()->history_size + 1));
|
|
|
|
}
|
|
|
|
|
|
|
|
uptr TraceParts() {
|
|
|
|
return TraceSize() / kTracePartSize;
|
|
|
|
}
|
|
|
|
|
2012-11-22 23:03:11 +01:00
|
|
|
#ifndef TSAN_GO
|
|
|
|
extern "C" void __tsan_trace_switch() {
|
|
|
|
TraceSwitch(cur_thread());
|
|
|
|
}
|
|
|
|
|
|
|
|
extern "C" void __tsan_report_race() {
|
|
|
|
ReportRace(cur_thread());
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
ALWAYS_INLINE
|
2013-11-04 22:33:31 +01:00
|
|
|
Shadow LoadShadow(u64 *p) {
|
2012-11-22 23:03:11 +01:00
|
|
|
u64 raw = atomic_load((atomic_uint64_t*)p, memory_order_relaxed);
|
|
|
|
return Shadow(raw);
|
|
|
|
}
|
|
|
|
|
|
|
|
ALWAYS_INLINE
|
2013-11-04 22:33:31 +01:00
|
|
|
void StoreShadow(u64 *sp, u64 s) {
|
2012-11-22 23:03:11 +01:00
|
|
|
atomic_store((atomic_uint64_t*)sp, s, memory_order_relaxed);
|
|
|
|
}
|
|
|
|
|
|
|
|
ALWAYS_INLINE
|
2013-11-04 22:33:31 +01:00
|
|
|
void StoreIfNotYetStored(u64 *sp, u64 *s) {
|
2012-11-22 23:03:11 +01:00
|
|
|
StoreShadow(sp, *s);
|
|
|
|
*s = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void HandleRace(ThreadState *thr, u64 *shadow_mem,
|
|
|
|
Shadow cur, Shadow old) {
|
|
|
|
thr->racy_state[0] = cur.raw();
|
|
|
|
thr->racy_state[1] = old.raw();
|
|
|
|
thr->racy_shadow_addr = shadow_mem;
|
2012-11-23 15:46:25 +01:00
|
|
|
#ifndef TSAN_GO
|
|
|
|
HACKY_CALL(__tsan_report_race);
|
|
|
|
#else
|
2012-11-22 23:03:11 +01:00
|
|
|
ReportRace(thr);
|
2012-11-23 15:46:25 +01:00
|
|
|
#endif
|
2012-11-22 23:03:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
static inline bool OldIsInSameSynchEpoch(Shadow old, ThreadState *thr) {
|
|
|
|
return old.epoch() >= thr->fast_synch_epoch;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline bool HappensBefore(Shadow old, ThreadState *thr) {
|
2012-12-05 14:19:55 +01:00
|
|
|
return thr->clock.get(old.TidWithIgnore()) >= old.epoch();
|
2012-11-22 23:03:11 +01:00
|
|
|
}
|
|
|
|
|
2013-11-04 22:33:31 +01:00
|
|
|
ALWAYS_INLINE USED
|
2012-11-22 23:03:11 +01:00
|
|
|
void MemoryAccessImpl(ThreadState *thr, uptr addr,
|
2013-02-13 11:46:01 +01:00
|
|
|
int kAccessSizeLog, bool kAccessIsWrite, bool kIsAtomic,
|
2012-11-22 23:03:11 +01:00
|
|
|
u64 *shadow_mem, Shadow cur) {
|
|
|
|
StatInc(thr, StatMop);
|
|
|
|
StatInc(thr, kAccessIsWrite ? StatMopWrite : StatMopRead);
|
|
|
|
StatInc(thr, (StatType)(StatMop1 + kAccessSizeLog));
|
|
|
|
|
|
|
|
// This potentially can live in an MMX/SSE scratch register.
|
|
|
|
// The required intrinsics are:
|
|
|
|
// __m128i _mm_move_epi64(__m128i*);
|
|
|
|
// _mm_storel_epi64(u64*, __m128i);
|
|
|
|
u64 store_word = cur.raw();
|
|
|
|
|
|
|
|
// scan all the shadow values and dispatch to 4 categories:
|
|
|
|
// same, replace, candidate and race (see comments below).
|
|
|
|
// we consider only 3 cases regarding access sizes:
|
|
|
|
// equal, intersect and not intersect. initially I considered
|
|
|
|
// larger and smaller as well, it allowed to replace some
|
|
|
|
// 'candidates' with 'same' or 'replace', but I think
|
|
|
|
// it's just not worth it (performance- and complexity-wise).
|
|
|
|
|
|
|
|
Shadow old(0);
|
|
|
|
if (kShadowCnt == 1) {
|
|
|
|
int idx = 0;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
} else if (kShadowCnt == 2) {
|
|
|
|
int idx = 0;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
idx = 1;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
} else if (kShadowCnt == 4) {
|
|
|
|
int idx = 0;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
idx = 1;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
idx = 2;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
idx = 3;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
} else if (kShadowCnt == 8) {
|
|
|
|
int idx = 0;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
idx = 1;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
idx = 2;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
idx = 3;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
idx = 4;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
idx = 5;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
idx = 6;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
idx = 7;
|
|
|
|
#include "tsan_update_shadow_word_inl.h"
|
|
|
|
} else {
|
|
|
|
CHECK(false);
|
|
|
|
}
|
|
|
|
|
|
|
|
// we did not find any races and had already stored
|
|
|
|
// the current access info, so we are done
|
|
|
|
if (LIKELY(store_word == 0))
|
|
|
|
return;
|
|
|
|
// choose a random candidate slot and replace it
|
|
|
|
StoreShadow(shadow_mem + (cur.epoch() % kShadowCnt), store_word);
|
|
|
|
StatInc(thr, StatShadowReplace);
|
|
|
|
return;
|
|
|
|
RACE:
|
|
|
|
HandleRace(thr, shadow_mem, cur, old);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2013-11-04 22:33:31 +01:00
|
|
|
void UnalignedMemoryAccess(ThreadState *thr, uptr pc, uptr addr,
|
|
|
|
int size, bool kAccessIsWrite, bool kIsAtomic) {
|
|
|
|
while (size) {
|
|
|
|
int size1 = 1;
|
|
|
|
int kAccessSizeLog = kSizeLog1;
|
|
|
|
if (size >= 8 && (addr & ~7) == ((addr + 8) & ~7)) {
|
|
|
|
size1 = 8;
|
|
|
|
kAccessSizeLog = kSizeLog8;
|
|
|
|
} else if (size >= 4 && (addr & ~7) == ((addr + 4) & ~7)) {
|
|
|
|
size1 = 4;
|
|
|
|
kAccessSizeLog = kSizeLog4;
|
|
|
|
} else if (size >= 2 && (addr & ~7) == ((addr + 2) & ~7)) {
|
|
|
|
size1 = 2;
|
|
|
|
kAccessSizeLog = kSizeLog2;
|
|
|
|
}
|
|
|
|
MemoryAccess(thr, pc, addr, kAccessSizeLog, kAccessIsWrite, kIsAtomic);
|
|
|
|
addr += size1;
|
|
|
|
size -= size1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
ALWAYS_INLINE USED
|
2012-11-22 23:03:11 +01:00
|
|
|
void MemoryAccess(ThreadState *thr, uptr pc, uptr addr,
|
2013-02-13 11:46:01 +01:00
|
|
|
int kAccessSizeLog, bool kAccessIsWrite, bool kIsAtomic) {
|
2012-11-22 23:03:11 +01:00
|
|
|
u64 *shadow_mem = (u64*)MemToShadow(addr);
|
2013-01-10 13:44:08 +01:00
|
|
|
DPrintf2("#%d: MemoryAccess: @%p %p size=%d"
|
2012-11-22 23:03:11 +01:00
|
|
|
" is_write=%d shadow_mem=%p {%zx, %zx, %zx, %zx}\n",
|
|
|
|
(int)thr->fast_state.tid(), (void*)pc, (void*)addr,
|
|
|
|
(int)(1 << kAccessSizeLog), kAccessIsWrite, shadow_mem,
|
|
|
|
(uptr)shadow_mem[0], (uptr)shadow_mem[1],
|
|
|
|
(uptr)shadow_mem[2], (uptr)shadow_mem[3]);
|
|
|
|
#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 (!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));
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
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, StatMop);
|
|
|
|
StatInc(thr, kAccessIsWrite ? StatMopWrite : StatMopRead);
|
|
|
|
StatInc(thr, (StatType)(StatMop1 + kAccessSizeLog));
|
|
|
|
StatInc(thr, StatMopRodata);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2012-11-22 23:03:11 +01:00
|
|
|
FastState fast_state = thr->fast_state;
|
|
|
|
if (fast_state.GetIgnoreBit())
|
|
|
|
return;
|
2014-05-22 09:09:21 +02:00
|
|
|
if (kCollectHistory) {
|
|
|
|
fast_state.IncrementEpoch();
|
|
|
|
thr->fast_state = fast_state;
|
|
|
|
// We must not store to the trace if we do not store to the shadow.
|
|
|
|
// That is, this call must be moved somewhere below.
|
|
|
|
TraceAddEvent(thr, fast_state, EventTypeMop, pc);
|
|
|
|
}
|
|
|
|
|
2012-11-22 23:03:11 +01:00
|
|
|
Shadow cur(fast_state);
|
|
|
|
cur.SetAddr0AndSizeLog(addr & 7, kAccessSizeLog);
|
|
|
|
cur.SetWrite(kAccessIsWrite);
|
2013-02-13 11:46:01 +01:00
|
|
|
cur.SetAtomic(kIsAtomic);
|
2012-11-22 23:03:11 +01:00
|
|
|
|
2013-02-13 11:46:01 +01:00
|
|
|
MemoryAccessImpl(thr, addr, kAccessSizeLog, kAccessIsWrite, kIsAtomic,
|
2012-11-22 23:03:11 +01:00
|
|
|
shadow_mem, cur);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void MemoryRangeSet(ThreadState *thr, uptr pc, uptr addr, uptr size,
|
|
|
|
u64 val) {
|
2013-11-04 22:33:31 +01:00
|
|
|
(void)thr;
|
|
|
|
(void)pc;
|
2012-11-22 23:03:11 +01:00
|
|
|
if (size == 0)
|
|
|
|
return;
|
|
|
|
// FIXME: fix me.
|
|
|
|
uptr offset = addr % kShadowCell;
|
|
|
|
if (offset) {
|
|
|
|
offset = kShadowCell - offset;
|
|
|
|
if (size <= offset)
|
|
|
|
return;
|
|
|
|
addr += offset;
|
|
|
|
size -= offset;
|
|
|
|
}
|
|
|
|
DCHECK_EQ(addr % 8, 0);
|
|
|
|
// If a user passes some insane arguments (memset(0)),
|
|
|
|
// let it just crash as usual.
|
|
|
|
if (!IsAppMem(addr) || !IsAppMem(addr + size - 1))
|
|
|
|
return;
|
2013-11-04 22:33:31 +01:00
|
|
|
// Don't want to touch lots of shadow memory.
|
|
|
|
// If a program maps 10MB stack, there is no need reset the whole range.
|
2012-11-22 23:03:11 +01:00
|
|
|
size = (size + (kShadowCell - 1)) & ~(kShadowCell - 1);
|
2013-11-04 22:33:31 +01:00
|
|
|
// UnmapOrDie/MmapFixedNoReserve does not work on Windows,
|
|
|
|
// so we do it only for C/C++.
|
2014-05-22 09:09:21 +02:00
|
|
|
if (kGoMode || size < common_flags()->clear_shadow_mmap_threshold) {
|
2013-11-04 22:33:31 +01:00
|
|
|
u64 *p = (u64*)MemToShadow(addr);
|
|
|
|
CHECK(IsShadowMem((uptr)p));
|
|
|
|
CHECK(IsShadowMem((uptr)(p + size * kShadowCnt / kShadowCell - 1)));
|
|
|
|
// FIXME: may overwrite a part outside the region
|
|
|
|
for (uptr i = 0; i < size / kShadowCell * kShadowCnt;) {
|
|
|
|
p[i++] = val;
|
|
|
|
for (uptr j = 1; j < kShadowCnt; j++)
|
|
|
|
p[i++] = 0;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
// The region is big, reset only beginning and end.
|
|
|
|
const uptr kPageSize = 4096;
|
|
|
|
u64 *begin = (u64*)MemToShadow(addr);
|
|
|
|
u64 *end = begin + size / kShadowCell * kShadowCnt;
|
|
|
|
u64 *p = begin;
|
|
|
|
// Set at least first kPageSize/2 to page boundary.
|
|
|
|
while ((p < begin + kPageSize / kShadowSize / 2) || ((uptr)p % kPageSize)) {
|
|
|
|
*p++ = val;
|
|
|
|
for (uptr j = 1; j < kShadowCnt; j++)
|
|
|
|
*p++ = 0;
|
|
|
|
}
|
|
|
|
// Reset middle part.
|
|
|
|
u64 *p1 = p;
|
|
|
|
p = RoundDown(end, kPageSize);
|
|
|
|
UnmapOrDie((void*)p1, (uptr)p - (uptr)p1);
|
|
|
|
MmapFixedNoReserve((uptr)p1, (uptr)p - (uptr)p1);
|
|
|
|
// Set the ending.
|
|
|
|
while (p < end) {
|
|
|
|
*p++ = val;
|
|
|
|
for (uptr j = 1; j < kShadowCnt; j++)
|
|
|
|
*p++ = 0;
|
|
|
|
}
|
2012-11-22 23:03:11 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void MemoryResetRange(ThreadState *thr, uptr pc, uptr addr, uptr size) {
|
|
|
|
MemoryRangeSet(thr, pc, addr, size, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
void MemoryRangeFreed(ThreadState *thr, uptr pc, uptr addr, uptr size) {
|
2013-11-04 22:33:31 +01:00
|
|
|
// Processing more than 1k (4k of shadow) is expensive,
|
|
|
|
// can cause excessive memory consumption (user does not necessary touch
|
|
|
|
// the whole range) and most likely unnecessary.
|
|
|
|
if (size > 1024)
|
|
|
|
size = 1024;
|
2013-02-13 11:46:01 +01:00
|
|
|
CHECK_EQ(thr->is_freeing, false);
|
|
|
|
thr->is_freeing = true;
|
2012-11-22 23:03:11 +01:00
|
|
|
MemoryAccessRange(thr, pc, addr, size, true);
|
2013-02-13 11:46:01 +01:00
|
|
|
thr->is_freeing = false;
|
2014-05-22 09:09:21 +02:00
|
|
|
if (kCollectHistory) {
|
|
|
|
thr->fast_state.IncrementEpoch();
|
|
|
|
TraceAddEvent(thr, thr->fast_state, EventTypeMop, pc);
|
|
|
|
}
|
2012-11-22 23:03:11 +01:00
|
|
|
Shadow s(thr->fast_state);
|
2012-12-05 14:19:55 +01:00
|
|
|
s.ClearIgnoreBit();
|
2012-11-22 23:03:11 +01:00
|
|
|
s.MarkAsFreed();
|
|
|
|
s.SetWrite(true);
|
|
|
|
s.SetAddr0AndSizeLog(0, 3);
|
|
|
|
MemoryRangeSet(thr, pc, addr, size, s.raw());
|
|
|
|
}
|
|
|
|
|
|
|
|
void MemoryRangeImitateWrite(ThreadState *thr, uptr pc, uptr addr, uptr size) {
|
2014-05-22 09:09:21 +02:00
|
|
|
if (kCollectHistory) {
|
|
|
|
thr->fast_state.IncrementEpoch();
|
|
|
|
TraceAddEvent(thr, thr->fast_state, EventTypeMop, pc);
|
|
|
|
}
|
2012-11-22 23:03:11 +01:00
|
|
|
Shadow s(thr->fast_state);
|
2012-12-05 14:19:55 +01:00
|
|
|
s.ClearIgnoreBit();
|
2012-11-22 23:03:11 +01:00
|
|
|
s.SetWrite(true);
|
|
|
|
s.SetAddr0AndSizeLog(0, 3);
|
|
|
|
MemoryRangeSet(thr, pc, addr, size, s.raw());
|
|
|
|
}
|
|
|
|
|
2013-11-04 22:33:31 +01:00
|
|
|
ALWAYS_INLINE USED
|
2012-11-22 23:03:11 +01:00
|
|
|
void FuncEntry(ThreadState *thr, uptr pc) {
|
|
|
|
StatInc(thr, StatFuncEnter);
|
|
|
|
DPrintf2("#%d: FuncEntry %p\n", (int)thr->fast_state.tid(), (void*)pc);
|
2014-05-22 09:09:21 +02:00
|
|
|
if (kCollectHistory) {
|
|
|
|
thr->fast_state.IncrementEpoch();
|
|
|
|
TraceAddEvent(thr, thr->fast_state, EventTypeFuncEnter, pc);
|
|
|
|
}
|
2012-11-22 23:03:11 +01:00
|
|
|
|
|
|
|
// Shadow stack maintenance can be replaced with
|
|
|
|
// stack unwinding during trace switch (which presumably must be faster).
|
2013-12-05 10:18:38 +01:00
|
|
|
DCHECK_GE(thr->shadow_stack_pos, thr->shadow_stack);
|
2012-11-22 23:03:11 +01:00
|
|
|
#ifndef TSAN_GO
|
2013-12-05 10:18:38 +01:00
|
|
|
DCHECK_LT(thr->shadow_stack_pos, thr->shadow_stack_end);
|
2012-11-22 23:03:11 +01:00
|
|
|
#else
|
|
|
|
if (thr->shadow_stack_pos == thr->shadow_stack_end) {
|
|
|
|
const int sz = thr->shadow_stack_end - thr->shadow_stack;
|
|
|
|
const int newsz = 2 * sz;
|
|
|
|
uptr *newstack = (uptr*)internal_alloc(MBlockShadowStack,
|
|
|
|
newsz * sizeof(uptr));
|
|
|
|
internal_memcpy(newstack, thr->shadow_stack, sz * sizeof(uptr));
|
|
|
|
internal_free(thr->shadow_stack);
|
|
|
|
thr->shadow_stack = newstack;
|
|
|
|
thr->shadow_stack_pos = newstack + sz;
|
|
|
|
thr->shadow_stack_end = newstack + newsz;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
thr->shadow_stack_pos[0] = pc;
|
|
|
|
thr->shadow_stack_pos++;
|
|
|
|
}
|
|
|
|
|
2013-11-04 22:33:31 +01:00
|
|
|
ALWAYS_INLINE USED
|
2012-11-22 23:03:11 +01:00
|
|
|
void FuncExit(ThreadState *thr) {
|
|
|
|
StatInc(thr, StatFuncExit);
|
|
|
|
DPrintf2("#%d: FuncExit\n", (int)thr->fast_state.tid());
|
2014-05-22 09:09:21 +02:00
|
|
|
if (kCollectHistory) {
|
|
|
|
thr->fast_state.IncrementEpoch();
|
|
|
|
TraceAddEvent(thr, thr->fast_state, EventTypeFuncExit, 0);
|
|
|
|
}
|
2012-11-22 23:03:11 +01:00
|
|
|
|
2013-12-05 10:18:38 +01:00
|
|
|
DCHECK_GT(thr->shadow_stack_pos, thr->shadow_stack);
|
2012-11-22 23:03:11 +01:00
|
|
|
#ifndef TSAN_GO
|
2013-12-05 10:18:38 +01:00
|
|
|
DCHECK_LT(thr->shadow_stack_pos, thr->shadow_stack_end);
|
2012-11-22 23:03:11 +01:00
|
|
|
#endif
|
|
|
|
thr->shadow_stack_pos--;
|
|
|
|
}
|
|
|
|
|
2013-12-05 10:18:38 +01:00
|
|
|
void ThreadIgnoreBegin(ThreadState *thr, uptr pc) {
|
2013-11-04 22:33:31 +01:00
|
|
|
DPrintf("#%d: ThreadIgnoreBegin\n", thr->tid);
|
|
|
|
thr->ignore_reads_and_writes++;
|
2013-12-05 10:18:38 +01:00
|
|
|
CHECK_GT(thr->ignore_reads_and_writes, 0);
|
2013-11-04 22:33:31 +01:00
|
|
|
thr->fast_state.SetIgnoreBit();
|
2013-12-05 10:18:38 +01:00
|
|
|
#ifndef TSAN_GO
|
2014-05-22 09:09:21 +02:00
|
|
|
if (!ctx->after_multithreaded_fork)
|
|
|
|
thr->mop_ignore_set.Add(CurrentStackId(thr, pc));
|
2013-12-05 10:18:38 +01:00
|
|
|
#endif
|
2013-11-04 22:33:31 +01:00
|
|
|
}
|
|
|
|
|
2013-12-05 10:18:38 +01:00
|
|
|
void ThreadIgnoreEnd(ThreadState *thr, uptr pc) {
|
2013-11-04 22:33:31 +01:00
|
|
|
DPrintf("#%d: ThreadIgnoreEnd\n", thr->tid);
|
|
|
|
thr->ignore_reads_and_writes--;
|
|
|
|
CHECK_GE(thr->ignore_reads_and_writes, 0);
|
2013-12-05 10:18:38 +01:00
|
|
|
if (thr->ignore_reads_and_writes == 0) {
|
2012-11-22 23:03:11 +01:00
|
|
|
thr->fast_state.ClearIgnoreBit();
|
2013-12-05 10:18:38 +01:00
|
|
|
#ifndef TSAN_GO
|
|
|
|
thr->mop_ignore_set.Reset();
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void ThreadIgnoreSyncBegin(ThreadState *thr, uptr pc) {
|
|
|
|
DPrintf("#%d: ThreadIgnoreSyncBegin\n", thr->tid);
|
|
|
|
thr->ignore_sync++;
|
|
|
|
CHECK_GT(thr->ignore_sync, 0);
|
|
|
|
#ifndef TSAN_GO
|
2014-05-22 09:09:21 +02:00
|
|
|
if (!ctx->after_multithreaded_fork)
|
|
|
|
thr->sync_ignore_set.Add(CurrentStackId(thr, pc));
|
2013-12-05 10:18:38 +01:00
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
void ThreadIgnoreSyncEnd(ThreadState *thr, uptr pc) {
|
|
|
|
DPrintf("#%d: ThreadIgnoreSyncEnd\n", thr->tid);
|
|
|
|
thr->ignore_sync--;
|
|
|
|
CHECK_GE(thr->ignore_sync, 0);
|
|
|
|
#ifndef TSAN_GO
|
|
|
|
if (thr->ignore_sync == 0)
|
2014-05-22 09:09:21 +02:00
|
|
|
thr->sync_ignore_set.Reset();
|
2013-12-05 10:18:38 +01:00
|
|
|
#endif
|
2012-11-22 23:03:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
bool MD5Hash::operator==(const MD5Hash &other) const {
|
|
|
|
return hash[0] == other.hash[0] && hash[1] == other.hash[1];
|
|
|
|
}
|
|
|
|
|
|
|
|
#if TSAN_DEBUG
|
|
|
|
void build_consistency_debug() {}
|
|
|
|
#else
|
|
|
|
void build_consistency_release() {}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#if TSAN_COLLECT_STATS
|
|
|
|
void build_consistency_stats() {}
|
|
|
|
#else
|
|
|
|
void build_consistency_nostats() {}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#if TSAN_SHADOW_COUNT == 1
|
|
|
|
void build_consistency_shadow1() {}
|
|
|
|
#elif TSAN_SHADOW_COUNT == 2
|
|
|
|
void build_consistency_shadow2() {}
|
|
|
|
#elif TSAN_SHADOW_COUNT == 4
|
|
|
|
void build_consistency_shadow4() {}
|
|
|
|
#else
|
|
|
|
void build_consistency_shadow8() {}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
} // namespace __tsan
|
|
|
|
|
|
|
|
#ifndef TSAN_GO
|
|
|
|
// Must be included in this file to make sure everything is inlined.
|
|
|
|
#include "tsan_interface_inl.h"
|
|
|
|
#endif
|