1//=-- lsan_thread.cc ------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file is a part of LeakSanitizer. 11// See lsan_thread.h for details. 12// 13//===----------------------------------------------------------------------===// 14 15#include "lsan_thread.h" 16 17#include "sanitizer_common/sanitizer_common.h" 18#include "sanitizer_common/sanitizer_placement_new.h" 19#include "sanitizer_common/sanitizer_thread_registry.h" 20#include "sanitizer_common/sanitizer_tls_get_addr.h" 21#include "lsan_allocator.h" 22 23namespace __lsan { 24 25const u32 kInvalidTid = (u32) -1; 26 27static ThreadRegistry *thread_registry; 28static THREADLOCAL u32 current_thread_tid = kInvalidTid; 29 30static ThreadContextBase *CreateThreadContext(u32 tid) { 31 void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext"); 32 return new(mem) ThreadContext(tid); 33} 34 35static const uptr kMaxThreads = 1 << 13; 36static const uptr kThreadQuarantineSize = 64; 37 38void InitializeThreadRegistry() { 39 static char thread_registry_placeholder[sizeof(ThreadRegistry)] ALIGNED(64); 40 thread_registry = new(thread_registry_placeholder) 41 ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize); 42} 43 44u32 GetCurrentThread() { 45 return current_thread_tid; 46} 47 48void SetCurrentThread(u32 tid) { 49 current_thread_tid = tid; 50} 51 52ThreadContext::ThreadContext(int tid) 53 : ThreadContextBase(tid), 54 stack_begin_(0), 55 stack_end_(0), 56 cache_begin_(0), 57 cache_end_(0), 58 tls_begin_(0), 59 tls_end_(0), 60 dtls_(nullptr) {} 61 62struct OnStartedArgs { 63 uptr stack_begin, stack_end, 64 cache_begin, cache_end, 65 tls_begin, tls_end; 66 DTLS *dtls; 67}; 68 69void ThreadContext::OnStarted(void *arg) { 70 OnStartedArgs *args = reinterpret_cast<OnStartedArgs *>(arg); 71 stack_begin_ = args->stack_begin; 72 stack_end_ = args->stack_end; 73 tls_begin_ = args->tls_begin; 74 tls_end_ = args->tls_end; 75 cache_begin_ = args->cache_begin; 76 cache_end_ = args->cache_end; 77 dtls_ = args->dtls; 78} 79 80void ThreadContext::OnFinished() { 81 AllocatorThreadFinish(); 82 DTLS_Destroy(); 83} 84 85u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached) { 86 return thread_registry->CreateThread(user_id, detached, parent_tid, 87 /* arg */ nullptr); 88} 89 90void ThreadStart(u32 tid, uptr os_id) { 91 OnStartedArgs args; 92 uptr stack_size = 0; 93 uptr tls_size = 0; 94 GetThreadStackAndTls(tid == 0, &args.stack_begin, &stack_size, 95 &args.tls_begin, &tls_size); 96 args.stack_end = args.stack_begin + stack_size; 97 args.tls_end = args.tls_begin + tls_size; 98 GetAllocatorCacheRange(&args.cache_begin, &args.cache_end); 99 args.dtls = DTLS_Get(); 100 thread_registry->StartThread(tid, os_id, &args); 101} 102 103void ThreadFinish() { 104 thread_registry->FinishThread(GetCurrentThread()); 105} 106 107ThreadContext *CurrentThreadContext() { 108 if (!thread_registry) return nullptr; 109 if (GetCurrentThread() == kInvalidTid) 110 return nullptr; 111 // No lock needed when getting current thread. 112 return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread()); 113} 114 115static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) { 116 uptr uid = (uptr)arg; 117 if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) { 118 return true; 119 } 120 return false; 121} 122 123u32 ThreadTid(uptr uid) { 124 return thread_registry->FindThread(FindThreadByUid, (void*)uid); 125} 126 127void ThreadJoin(u32 tid) { 128 CHECK_NE(tid, kInvalidTid); 129 thread_registry->JoinThread(tid, /* arg */nullptr); 130} 131 132void EnsureMainThreadIDIsCorrect() { 133 if (GetCurrentThread() == 0) 134 CurrentThreadContext()->os_id = GetTid(); 135} 136 137///// Interface to the common LSan module. ///// 138 139bool GetThreadRangesLocked(uptr os_id, uptr *stack_begin, uptr *stack_end, 140 uptr *tls_begin, uptr *tls_end, uptr *cache_begin, 141 uptr *cache_end, DTLS **dtls) { 142 ThreadContext *context = static_cast<ThreadContext *>( 143 thread_registry->FindThreadContextByOsIDLocked(os_id)); 144 if (!context) return false; 145 *stack_begin = context->stack_begin(); 146 *stack_end = context->stack_end(); 147 *tls_begin = context->tls_begin(); 148 *tls_end = context->tls_end(); 149 *cache_begin = context->cache_begin(); 150 *cache_end = context->cache_end(); 151 *dtls = context->dtls(); 152 return true; 153} 154 155void ForEachExtraStackRange(uptr os_id, RangeIteratorCallback callback, 156 void *arg) { 157} 158 159void LockThreadRegistry() { 160 thread_registry->Lock(); 161} 162 163void UnlockThreadRegistry() { 164 thread_registry->Unlock(); 165} 166 167} // namespace __lsan 168