gcc/libsanitizer/tsan/tsan_rtl.cc

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//===-- tsan_rtl.cc -------------------------------------------------------===//
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
// Main file (entry points) for the TSan run-time.
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_atomic.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "sanitizer_common/sanitizer_stackdepot.h"
#include "sanitizer_common/sanitizer_placement_new.h"
#include "sanitizer_common/sanitizer_symbolizer.h"
#include "tsan_defs.h"
#include "tsan_platform.h"
#include "tsan_rtl.h"
#include "tsan_mman.h"
#include "tsan_suppressions.h"
#include "tsan_symbolize.h"
volatile int __tsan_resumed = 0;
extern "C" void __tsan_resume() {
__tsan_resumed = 1;
}
namespace __tsan {
#ifndef TSAN_GO
THREADLOCAL char cur_thread_placeholder[sizeof(ThreadState)] ALIGNED(64);
#endif
static char ctx_placeholder[sizeof(Context)] ALIGNED(64);
Context *ctx;
// Can be overriden by a front-end.
#ifdef TSAN_EXTERNAL_HOOKS
bool OnFinalize(bool failed);
void OnInitialize();
#else
SANITIZER_INTERFACE_ATTRIBUTE
bool WEAK OnFinalize(bool failed) {
return failed;
}
SANITIZER_INTERFACE_ATTRIBUTE
void WEAK OnInitialize() {}
#endif
static char thread_registry_placeholder[sizeof(ThreadRegistry)];
static ThreadContextBase *CreateThreadContext(u32 tid) {
// Map thread trace when context is created.
MapThreadTrace(GetThreadTrace(tid), TraceSize() * sizeof(Event));
MapThreadTrace(GetThreadTraceHeader(tid), sizeof(Trace));
new(ThreadTrace(tid)) Trace();
void *mem = internal_alloc(MBlockThreadContex, sizeof(ThreadContext));
return new(mem) ThreadContext(tid);
}
#ifndef TSAN_GO
static const u32 kThreadQuarantineSize = 16;
#else
static const u32 kThreadQuarantineSize = 64;
#endif
Context::Context()
: initialized()
, report_mtx(MutexTypeReport, StatMtxReport)
, nreported()
, nmissed_expected()
, thread_registry(new(thread_registry_placeholder) ThreadRegistry(
CreateThreadContext, kMaxTid, kThreadQuarantineSize, kMaxTidReuse))
, racy_stacks(MBlockRacyStacks)
, racy_addresses(MBlockRacyAddresses)
, fired_suppressions(8) {
}
// The objects are allocated in TLS, so one may rely on zero-initialization.
ThreadState::ThreadState(Context *ctx, int tid, int unique_id, u64 epoch,
unsigned reuse_count,
uptr stk_addr, uptr stk_size,
uptr tls_addr, uptr tls_size)
: fast_state(tid, epoch)
// Do not touch these, rely on zero initialization,
// they may be accessed before the ctor.
// , ignore_reads_and_writes()
// , ignore_interceptors()
, clock(tid, reuse_count)
#ifndef TSAN_GO
, jmp_bufs(MBlockJmpBuf)
#endif
, tid(tid)
, unique_id(unique_id)
, stk_addr(stk_addr)
, stk_size(stk_size)
, tls_addr(tls_addr)
, tls_size(tls_size)
#ifndef TSAN_GO
, last_sleep_clock(tid)
#endif
{
}
static void MemoryProfiler(Context *ctx, fd_t fd, int i) {
uptr n_threads;
uptr n_running_threads;
ctx->thread_registry->GetNumberOfThreads(&n_threads, &n_running_threads);
InternalScopedBuffer<char> buf(4096);
internal_snprintf(buf.data(), buf.size(), "%d: nthr=%d nlive=%d\n",
i, n_threads, n_running_threads);
internal_write(fd, buf.data(), internal_strlen(buf.data()));
WriteMemoryProfile(buf.data(), buf.size());
internal_write(fd, buf.data(), internal_strlen(buf.data()));
}
static void BackgroundThread(void *arg) {
#ifndef TSAN_GO
// This is a non-initialized non-user thread, nothing to see here.
// We don't use ScopedIgnoreInterceptors, because we want ignores to be
// enabled even when the thread function exits (e.g. during pthread thread
// shutdown code).
cur_thread()->ignore_interceptors++;
#endif
const u64 kMs2Ns = 1000 * 1000;
fd_t mprof_fd = kInvalidFd;
if (flags()->profile_memory && flags()->profile_memory[0]) {
InternalScopedBuffer<char> filename(4096);
internal_snprintf(filename.data(), filename.size(), "%s.%d",
flags()->profile_memory, (int)internal_getpid());
uptr openrv = OpenFile(filename.data(), true);
if (internal_iserror(openrv)) {
Printf("ThreadSanitizer: failed to open memory profile file '%s'\n",
&filename[0]);
} else {
mprof_fd = openrv;
}
}
u64 last_flush = NanoTime();
uptr last_rss = 0;
for (int i = 0;
atomic_load(&ctx->stop_background_thread, memory_order_relaxed) == 0;
i++) {
SleepForMillis(100);
u64 now = NanoTime();
// Flush memory if requested.
if (flags()->flush_memory_ms > 0) {
if (last_flush + flags()->flush_memory_ms * kMs2Ns < now) {
if (flags()->verbosity > 0)
Printf("ThreadSanitizer: periodic memory flush\n");
FlushShadowMemory();
last_flush = NanoTime();
}
}
if (flags()->memory_limit_mb > 0) {
uptr rss = GetRSS();
uptr limit = uptr(flags()->memory_limit_mb) << 20;
if (flags()->verbosity > 0) {
Printf("ThreadSanitizer: memory flush check"
" RSS=%llu LAST=%llu LIMIT=%llu\n",
(u64)rss>>20, (u64)last_rss>>20, (u64)limit>>20);
}
if (2 * rss > limit + last_rss) {
if (flags()->verbosity > 0)
Printf("ThreadSanitizer: flushing memory due to RSS\n");
FlushShadowMemory();
rss = GetRSS();
if (flags()->verbosity > 0)
Printf("ThreadSanitizer: memory flushed RSS=%llu\n", (u64)rss>>20);
}
last_rss = rss;
}
// Write memory profile if requested.
if (mprof_fd != kInvalidFd)
MemoryProfiler(ctx, mprof_fd, i);
#ifndef TSAN_GO
// Flush symbolizer cache if requested.
if (flags()->flush_symbolizer_ms > 0) {
u64 last = atomic_load(&ctx->last_symbolize_time_ns,
memory_order_relaxed);
if (last != 0 && last + flags()->flush_symbolizer_ms * kMs2Ns < now) {
Lock l(&ctx->report_mtx);
SpinMutexLock l2(&CommonSanitizerReportMutex);
SymbolizeFlush();
atomic_store(&ctx->last_symbolize_time_ns, 0, memory_order_relaxed);
}
}
#endif
}
}
static void StartBackgroundThread() {
ctx->background_thread = internal_start_thread(&BackgroundThread, 0);
}
static void StopBackgroundThread() {
atomic_store(&ctx->stop_background_thread, 1, memory_order_relaxed);
internal_join_thread(ctx->background_thread);
ctx->background_thread = 0;
}
void DontNeedShadowFor(uptr addr, uptr size) {
uptr shadow_beg = MemToShadow(addr);
uptr shadow_end = MemToShadow(addr + size);
FlushUnneededShadowMemory(shadow_beg, shadow_end - shadow_beg);
}
void MapShadow(uptr addr, uptr size) {
// Global data is not 64K aligned, but there are no adjacent mappings,
// so we can get away with unaligned mapping.
// CHECK_EQ(addr, addr & ~((64 << 10) - 1)); // windows wants 64K alignment
MmapFixedNoReserve(MemToShadow(addr), size * kShadowMultiplier);
}
void MapThreadTrace(uptr addr, uptr size) {
DPrintf("#0: Mapping trace at %p-%p(0x%zx)\n", addr, addr + size, size);
CHECK_GE(addr, kTraceMemBegin);
CHECK_LE(addr + size, kTraceMemBegin + kTraceMemSize);
CHECK_EQ(addr, addr & ~((64 << 10) - 1)); // windows wants 64K alignment
uptr addr1 = (uptr)MmapFixedNoReserve(addr, size);
if (addr1 != addr) {
Printf("FATAL: ThreadSanitizer can not mmap thread trace (%p/%p->%p)\n",
addr, size, addr1);
Die();
}
}
void Initialize(ThreadState *thr) {
// Thread safe because done before all threads exist.
static bool is_initialized = false;
if (is_initialized)
return;
is_initialized = true;
// We are not ready to handle interceptors yet.
ScopedIgnoreInterceptors ignore;
SanitizerToolName = "ThreadSanitizer";
// Install tool-specific callbacks in sanitizer_common.
SetCheckFailedCallback(TsanCheckFailed);
#ifndef TSAN_GO
InitializeAllocator();
#endif
InitializeInterceptors();
const char *env = InitializePlatform();
InitializeMutex();
InitializeDynamicAnnotations();
ctx = new(ctx_placeholder) Context;
#ifndef TSAN_GO
InitializeShadowMemory();
#endif
InitializeFlags(&ctx->flags, env);
// Setup correct file descriptor for error reports.
__sanitizer_set_report_path(flags()->log_path);
InitializeSuppressions();
#ifndef TSAN_GO
InitializeLibIgnore();
Symbolizer::Init(common_flags()->external_symbolizer_path);
Symbolizer::Get()->AddHooks(EnterSymbolizer, ExitSymbolizer);
#endif
StartBackgroundThread();
SetSandboxingCallback(StopBackgroundThread);
if (flags()->detect_deadlocks)
ctx->dd = DDetector::Create(flags());
if (ctx->flags.verbosity)
Printf("***** Running under ThreadSanitizer v2 (pid %d) *****\n",
(int)internal_getpid());
// Initialize thread 0.
int tid = ThreadCreate(thr, 0, 0, true);
CHECK_EQ(tid, 0);
ThreadStart(thr, tid, internal_getpid());
ctx->initialized = true;
if (flags()->stop_on_start) {
Printf("ThreadSanitizer is suspended at startup (pid %d)."
" Call __tsan_resume().\n",
(int)internal_getpid());
while (__tsan_resumed == 0) {}
}
OnInitialize();
}
int Finalize(ThreadState *thr) {
Context *ctx = __tsan::ctx;
bool failed = false;
if (flags()->atexit_sleep_ms > 0 && ThreadCount(thr) > 1)
SleepForMillis(flags()->atexit_sleep_ms);
// Wait for pending reports.
ctx->report_mtx.Lock();
CommonSanitizerReportMutex.Lock();
CommonSanitizerReportMutex.Unlock();
ctx->report_mtx.Unlock();
#ifndef TSAN_GO
if (ctx->flags.verbosity)
AllocatorPrintStats();
#endif
ThreadFinalize(thr);
if (ctx->nreported) {
failed = true;
#ifndef TSAN_GO
Printf("ThreadSanitizer: reported %d warnings\n", ctx->nreported);
#else
Printf("Found %d data race(s)\n", ctx->nreported);
#endif
}
if (ctx->nmissed_expected) {
failed = true;
Printf("ThreadSanitizer: missed %d expected races\n",
ctx->nmissed_expected);
}
if (flags()->print_suppressions)
PrintMatchedSuppressions();
#ifndef TSAN_GO
if (flags()->print_benign)
PrintMatchedBenignRaces();
#endif
failed = OnFinalize(failed);
StatAggregate(ctx->stat, thr->stat);
StatOutput(ctx->stat);
return failed ? flags()->exitcode : 0;
}
#ifndef TSAN_GO
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
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++;
Trace *thr_trace = ThreadTrace(thr->tid);
Lock l(&thr_trace->mtx);
unsigned trace = (thr->fast_state.epoch() / kTracePartSize) % TraceParts();
TraceHeader *hdr = &thr_trace->headers[trace];
hdr->epoch0 = thr->fast_state.epoch();
hdr->stack0.ObtainCurrent(thr, 0);
hdr->mset0 = thr->mset;
thr->nomalloc--;
}
Trace *ThreadTrace(int tid) {
return (Trace*)GetThreadTraceHeader(tid);
}
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;
}
#ifndef TSAN_GO
extern "C" void __tsan_trace_switch() {
TraceSwitch(cur_thread());
}
extern "C" void __tsan_report_race() {
ReportRace(cur_thread());
}
#endif
ALWAYS_INLINE
Shadow LoadShadow(u64 *p) {
u64 raw = atomic_load((atomic_uint64_t*)p, memory_order_relaxed);
return Shadow(raw);
}
ALWAYS_INLINE
void StoreShadow(u64 *sp, u64 s) {
atomic_store((atomic_uint64_t*)sp, s, memory_order_relaxed);
}
ALWAYS_INLINE
void StoreIfNotYetStored(u64 *sp, u64 *s) {
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;
#ifndef TSAN_GO
HACKY_CALL(__tsan_report_race);
#else
ReportRace(thr);
#endif
}
static inline bool OldIsInSameSynchEpoch(Shadow old, ThreadState *thr) {
return old.epoch() >= thr->fast_synch_epoch;
}
static inline bool HappensBefore(Shadow old, ThreadState *thr) {
return thr->clock.get(old.TidWithIgnore()) >= old.epoch();
}
ALWAYS_INLINE USED
void MemoryAccessImpl(ThreadState *thr, uptr addr,
int kAccessSizeLog, bool kAccessIsWrite, bool kIsAtomic,
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;
}
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
void MemoryAccess(ThreadState *thr, uptr pc, uptr addr,
int kAccessSizeLog, bool kAccessIsWrite, bool kIsAtomic) {
u64 *shadow_mem = (u64*)MemToShadow(addr);
DPrintf2("#%d: MemoryAccess: @%p %p size=%d"
" 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)) {
Printf("Access to non app mem %zx\n", addr);
DCHECK(IsAppMem(addr));
}
if (!IsShadowMem((uptr)shadow_mem)) {
Printf("Bad shadow addr %p (%zx)\n", shadow_mem, addr);
DCHECK(IsShadowMem((uptr)shadow_mem));
}
#endif
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;
}
FastState fast_state = thr->fast_state;
if (fast_state.GetIgnoreBit())
return;
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);
}
Shadow cur(fast_state);
cur.SetAddr0AndSizeLog(addr & 7, kAccessSizeLog);
cur.SetWrite(kAccessIsWrite);
cur.SetAtomic(kIsAtomic);
MemoryAccessImpl(thr, addr, kAccessSizeLog, kAccessIsWrite, kIsAtomic,
shadow_mem, cur);
}
static void MemoryRangeSet(ThreadState *thr, uptr pc, uptr addr, uptr size,
u64 val) {
(void)thr;
(void)pc;
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;
// Don't want to touch lots of shadow memory.
// If a program maps 10MB stack, there is no need reset the whole range.
size = (size + (kShadowCell - 1)) & ~(kShadowCell - 1);
// UnmapOrDie/MmapFixedNoReserve does not work on Windows,
// so we do it only for C/C++.
if (kGoMode || size < common_flags()->clear_shadow_mmap_threshold) {
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;
}
}
}
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) {
// 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;
CHECK_EQ(thr->is_freeing, false);
thr->is_freeing = true;
MemoryAccessRange(thr, pc, addr, size, true);
thr->is_freeing = false;
if (kCollectHistory) {
thr->fast_state.IncrementEpoch();
TraceAddEvent(thr, thr->fast_state, EventTypeMop, pc);
}
Shadow s(thr->fast_state);
s.ClearIgnoreBit();
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) {
if (kCollectHistory) {
thr->fast_state.IncrementEpoch();
TraceAddEvent(thr, thr->fast_state, EventTypeMop, pc);
}
Shadow s(thr->fast_state);
s.ClearIgnoreBit();
s.SetWrite(true);
s.SetAddr0AndSizeLog(0, 3);
MemoryRangeSet(thr, pc, addr, size, s.raw());
}
ALWAYS_INLINE USED
void FuncEntry(ThreadState *thr, uptr pc) {
StatInc(thr, StatFuncEnter);
DPrintf2("#%d: FuncEntry %p\n", (int)thr->fast_state.tid(), (void*)pc);
if (kCollectHistory) {
thr->fast_state.IncrementEpoch();
TraceAddEvent(thr, thr->fast_state, EventTypeFuncEnter, pc);
}
// Shadow stack maintenance can be replaced with
// stack unwinding during trace switch (which presumably must be faster).
DCHECK_GE(thr->shadow_stack_pos, thr->shadow_stack);
#ifndef TSAN_GO
DCHECK_LT(thr->shadow_stack_pos, thr->shadow_stack_end);
#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++;
}
ALWAYS_INLINE USED
void FuncExit(ThreadState *thr) {
StatInc(thr, StatFuncExit);
DPrintf2("#%d: FuncExit\n", (int)thr->fast_state.tid());
if (kCollectHistory) {
thr->fast_state.IncrementEpoch();
TraceAddEvent(thr, thr->fast_state, EventTypeFuncExit, 0);
}
DCHECK_GT(thr->shadow_stack_pos, thr->shadow_stack);
#ifndef TSAN_GO
DCHECK_LT(thr->shadow_stack_pos, thr->shadow_stack_end);
#endif
thr->shadow_stack_pos--;
}
void ThreadIgnoreBegin(ThreadState *thr, uptr pc) {
DPrintf("#%d: ThreadIgnoreBegin\n", thr->tid);
thr->ignore_reads_and_writes++;
CHECK_GT(thr->ignore_reads_and_writes, 0);
thr->fast_state.SetIgnoreBit();
#ifndef TSAN_GO
if (!ctx->after_multithreaded_fork)
thr->mop_ignore_set.Add(CurrentStackId(thr, pc));
#endif
}
void ThreadIgnoreEnd(ThreadState *thr, uptr pc) {
DPrintf("#%d: ThreadIgnoreEnd\n", thr->tid);
thr->ignore_reads_and_writes--;
CHECK_GE(thr->ignore_reads_and_writes, 0);
if (thr->ignore_reads_and_writes == 0) {
thr->fast_state.ClearIgnoreBit();
#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
if (!ctx->after_multithreaded_fork)
thr->sync_ignore_set.Add(CurrentStackId(thr, pc));
#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)
thr->sync_ignore_set.Reset();
#endif
}
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