| //===-- tsan_mman.cc ------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // 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. |
| // |
| //===----------------------------------------------------------------------===// |
| #include "sanitizer_common/sanitizer_common.h" |
| #include "sanitizer_common/sanitizer_placement_new.h" |
| #include "sanitizer_common/sanitizer_stackdepot.h" |
| #include "tsan_mman.h" |
| #include "tsan_rtl.h" |
| #include "tsan_report.h" |
| #include "tsan_flags.h" |
| |
| namespace __tsan { |
| |
| static char allocator_placeholder[sizeof(Allocator)] ALIGNED(64); |
| Allocator *allocator() { |
| return reinterpret_cast<Allocator*>(&allocator_placeholder); |
| } |
| |
| void InitializeAllocator() { |
| allocator()->Init(); |
| } |
| |
| void AlloctorThreadFinish(ThreadState *thr) { |
| allocator()->SwallowCache(&thr->alloc_cache); |
| } |
| |
| static void SignalUnsafeCall(ThreadState *thr, uptr pc) { |
| if (!thr->in_signal_handler || !flags()->report_signal_unsafe) |
| return; |
| StackTrace stack; |
| stack.ObtainCurrent(thr, pc); |
| ScopedReport rep(ReportTypeSignalUnsafe); |
| rep.AddStack(&stack); |
| OutputReport(rep, rep.GetReport()->stacks[0]); |
| } |
| |
| void *user_alloc(ThreadState *thr, uptr pc, uptr sz, uptr align) { |
| CHECK_GT(thr->in_rtl, 0); |
| void *p = allocator()->Allocate(&thr->alloc_cache, sz, align); |
| if (p == 0) |
| return 0; |
| MBlock *b = (MBlock*)allocator()->GetMetaData(p); |
| b->size = sz; |
| b->alloc_tid = thr->unique_id; |
| b->alloc_stack_id = 0; |
| if (thr->shadow_stack_pos) // May happen during bootstrap. |
| b->alloc_stack_id = StackDepotPut(thr->shadow_stack, |
| thr->shadow_stack_pos - thr->shadow_stack); |
| if (CTX() && CTX()->initialized) { |
| MemoryRangeImitateWrite(thr, pc, (uptr)p, sz); |
| } |
| DPrintf("#%d: alloc(%zu) = %p\n", thr->tid, sz, p); |
| SignalUnsafeCall(thr, pc); |
| return p; |
| } |
| |
| void user_free(ThreadState *thr, uptr pc, void *p) { |
| CHECK_GT(thr->in_rtl, 0); |
| CHECK_NE(p, (void*)0); |
| DPrintf("#%d: free(%p)\n", thr->tid, p); |
| MBlock *b = (MBlock*)allocator()->GetMetaData(p); |
| if (b->head) { |
| Lock l(&b->mtx); |
| for (SyncVar *s = b->head; s;) { |
| SyncVar *res = s; |
| s = s->next; |
| StatInc(thr, StatSyncDestroyed); |
| res->mtx.Lock(); |
| res->mtx.Unlock(); |
| DestroyAndFree(res); |
| } |
| b->head = 0; |
| } |
| if (CTX() && CTX()->initialized && thr->in_rtl == 1) { |
| MemoryRangeFreed(thr, pc, (uptr)p, b->size); |
| } |
| allocator()->Deallocate(&thr->alloc_cache, p); |
| SignalUnsafeCall(thr, pc); |
| } |
| |
| void *user_realloc(ThreadState *thr, uptr pc, void *p, uptr sz) { |
| CHECK_GT(thr->in_rtl, 0); |
| void *p2 = 0; |
| // FIXME: Handle "shrinking" more efficiently, |
| // it seems that some software actually does this. |
| if (sz) { |
| p2 = user_alloc(thr, pc, sz); |
| if (p2 == 0) |
| return 0; |
| if (p) { |
| MBlock *b = user_mblock(thr, p); |
| internal_memcpy(p2, p, min(b->size, sz)); |
| } |
| } |
| if (p) { |
| user_free(thr, pc, p); |
| } |
| return p2; |
| } |
| |
| MBlock *user_mblock(ThreadState *thr, void *p) { |
| // CHECK_GT(thr->in_rtl, 0); |
| CHECK_NE(p, (void*)0); |
| return (MBlock*)allocator()->GetMetaData(p); |
| } |
| |
| void *internal_alloc(MBlockType typ, uptr sz) { |
| ThreadState *thr = cur_thread(); |
| CHECK_GT(thr->in_rtl, 0); |
| if (thr->nomalloc) { |
| thr->nomalloc = 0; // CHECK calls internal_malloc(). |
| CHECK(0); |
| } |
| return InternalAlloc(sz); |
| } |
| |
| void internal_free(void *p) { |
| ThreadState *thr = cur_thread(); |
| CHECK_GT(thr->in_rtl, 0); |
| if (thr->nomalloc) { |
| thr->nomalloc = 0; // CHECK calls internal_malloc(). |
| CHECK(0); |
| } |
| InternalFree(p); |
| } |
| |
| } // namespace __tsan |