#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_MAC
+#include "sanitizer_common/sanitizer_atomic.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_libc.h"
+#include "sanitizer_common/sanitizer_posix.h"
#include "sanitizer_common/sanitizer_procmaps.h"
#include "tsan_platform.h"
#include "tsan_rtl.h"
namespace __tsan {
-uptr GetShadowMemoryConsumption() {
- return 0;
+static void *SignalSafeGetOrAllocate(uptr *dst, uptr size) {
+ atomic_uintptr_t *a = (atomic_uintptr_t *)dst;
+ void *val = (void *)atomic_load_relaxed(a);
+ atomic_signal_fence(memory_order_acquire); // Turns the previous load into
+ // acquire wrt signals.
+ if (UNLIKELY(val == nullptr)) {
+ val = (void *)internal_mmap(nullptr, size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANON, -1, 0);
+ CHECK(val);
+ void *cmp = nullptr;
+ if (!atomic_compare_exchange_strong(a, (uintptr_t *)&cmp, (uintptr_t)val,
+ memory_order_acq_rel)) {
+ internal_munmap(val, size);
+ val = cmp;
+ }
+ }
+ return val;
}
-void FlushShadowMemory() {
+#ifndef SANITIZER_GO
+// On OS X, accessing TLVs via __thread or manually by using pthread_key_* is
+// problematic, because there are several places where interceptors are called
+// when TLVs are not accessible (early process startup, thread cleanup, ...).
+// The following provides a "poor man's TLV" implementation, where we use the
+// shadow memory of the pointer returned by pthread_self() to store a pointer to
+// the ThreadState object. The main thread's ThreadState pointer is stored
+// separately in a static variable, because we need to access it even before the
+// shadow memory is set up.
+static uptr main_thread_identity = 0;
+static ThreadState *main_thread_state = nullptr;
+
+ThreadState *cur_thread() {
+ ThreadState **fake_tls;
+ uptr thread_identity = (uptr)pthread_self();
+ if (thread_identity == main_thread_identity || main_thread_identity == 0) {
+ fake_tls = &main_thread_state;
+ } else {
+ fake_tls = (ThreadState **)MemToShadow(thread_identity);
+ }
+ ThreadState *thr = (ThreadState *)SignalSafeGetOrAllocate(
+ (uptr *)fake_tls, sizeof(ThreadState));
+ return thr;
}
-void WriteMemoryProfile(char *buf, uptr buf_size) {
+// TODO(kuba.brecka): This is not async-signal-safe. In particular, we call
+// munmap first and then clear `fake_tls`; if we receive a signal in between,
+// handler will try to access the unmapped ThreadState.
+void cur_thread_finalize() {
+ uptr thread_identity = (uptr)pthread_self();
+ CHECK_NE(thread_identity, main_thread_identity);
+ ThreadState **fake_tls = (ThreadState **)MemToShadow(thread_identity);
+ internal_munmap(*fake_tls, sizeof(ThreadState));
+ *fake_tls = nullptr;
}
+#endif
-uptr GetRSS() {
+uptr GetShadowMemoryConsumption() {
return 0;
}
-#ifndef TSAN_GO
-void InitializeShadowMemory() {
- uptr shadow = (uptr)MmapFixedNoReserve(kLinuxShadowBeg,
- kLinuxShadowEnd - kLinuxShadowBeg);
- if (shadow != kLinuxShadowBeg) {
- Printf("FATAL: ThreadSanitizer can not mmap the shadow memory\n");
- Printf("FATAL: Make sure to compile with -fPIE and "
- "to link with -pie.\n");
- Die();
- }
- DPrintf("kLinuxShadow %zx-%zx (%zuGB)\n",
- kLinuxShadowBeg, kLinuxShadowEnd,
- (kLinuxShadowEnd - kLinuxShadowBeg) >> 30);
- DPrintf("kLinuxAppMem %zx-%zx (%zuGB)\n",
- kLinuxAppMemBeg, kLinuxAppMemEnd,
- (kLinuxAppMemEnd - kLinuxAppMemBeg) >> 30);
+void FlushShadowMemory() {
+}
+
+void WriteMemoryProfile(char *buf, uptr buf_size, uptr nthread, uptr nlive) {
}
+
+#ifndef SANITIZER_GO
+void InitializeShadowMemoryPlatform() { }
#endif
-const char *InitializePlatform() {
- void *p = 0;
- if (sizeof(p) == 8) {
- // Disable core dumps, dumping of 16TB usually takes a bit long.
- // The following magic is to prevent clang from replacing it with memset.
- volatile rlimit lim;
- lim.rlim_cur = 0;
- lim.rlim_max = 0;
- setrlimit(RLIMIT_CORE, (rlimit*)&lim);
+// On OS X, GCD worker threads are created without a call to pthread_create. We
+// need to properly register these threads with ThreadCreate and ThreadStart.
+// These threads don't have a parent thread, as they are created "spuriously".
+// We're using a libpthread API that notifies us about a newly created thread.
+// The `thread == pthread_self()` check indicates this is actually a worker
+// thread. If it's just a regular thread, this hook is called on the parent
+// thread.
+typedef void (*pthread_introspection_hook_t)(unsigned int event,
+ pthread_t thread, void *addr,
+ size_t size);
+extern "C" pthread_introspection_hook_t pthread_introspection_hook_install(
+ pthread_introspection_hook_t hook);
+static const uptr PTHREAD_INTROSPECTION_THREAD_CREATE = 1;
+static const uptr PTHREAD_INTROSPECTION_THREAD_DESTROY = 4;
+static pthread_introspection_hook_t prev_pthread_introspection_hook;
+static void my_pthread_introspection_hook(unsigned int event, pthread_t thread,
+ void *addr, size_t size) {
+ if (event == PTHREAD_INTROSPECTION_THREAD_CREATE) {
+ if (thread == pthread_self()) {
+ // The current thread is a newly created GCD worker thread.
+ ThreadState *parent_thread_state = nullptr; // No parent.
+ int tid = ThreadCreate(parent_thread_state, 0, (uptr)thread, true);
+ CHECK_NE(tid, 0);
+ ThreadState *thr = cur_thread();
+ ThreadStart(thr, tid, GetTid());
+ }
+ } else if (event == PTHREAD_INTROSPECTION_THREAD_DESTROY) {
+ ThreadState *thr = cur_thread();
+ if (thr->tctx->parent_tid == kInvalidTid) {
+ DestroyThreadState();
+ }
}
- return GetEnv(kTsanOptionsEnv);
+ if (prev_pthread_introspection_hook != nullptr)
+ prev_pthread_introspection_hook(event, thread, addr, size);
}
-void FinalizePlatform() {
- fflush(0);
+void InitializePlatform() {
+ DisableCoreDumperIfNecessary();
+#ifndef SANITIZER_GO
+ CheckAndProtect();
+
+ CHECK_EQ(main_thread_identity, 0);
+ main_thread_identity = (uptr)pthread_self();
+#endif
+
+ prev_pthread_introspection_hook =
+ pthread_introspection_hook_install(&my_pthread_introspection_hook);
}
-#ifndef TSAN_GO
+#ifndef SANITIZER_GO
+// Note: this function runs with async signals enabled,
+// so it must not touch any tsan state.
int call_pthread_cancel_with_cleanup(int(*fn)(void *c, void *m,
void *abstime), void *c, void *m, void *abstime,
void(*cleanup)(void *arg), void *arg) {
}
#endif
+bool IsGlobalVar(uptr addr) {
+ return false;
+}
+
} // namespace __tsan
#endif // SANITIZER_MAC
projects / rustc.git / blobdiff