Mercurial > hg > CbC > CbC_llvm

comparison projects/compiler-rt/lib/lsan/lsan_thread.cc @ 131:f476a9ba4795

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
author mir3636
date Fri, 16 Feb 2018 21:02:11 +0900
parents
children
comparison
equal deleted inserted replaced
130:cc94f0a83282 131:f476a9ba4795
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 #include "lsan_common.h"
23
24 namespace __lsan {
25
26 static ThreadRegistry *thread_registry;
27
28 static ThreadContextBase *CreateThreadContext(u32 tid) {
29 void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
30 return new(mem) ThreadContext(tid);
31 }
32
33 static const uptr kMaxThreads = 1 << 13;
34 static const uptr kThreadQuarantineSize = 64;
35
36 void InitializeThreadRegistry() {
37 static ALIGNED(64) char thread_registry_placeholder[sizeof(ThreadRegistry)];
38 thread_registry = new(thread_registry_placeholder)
39 ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
40 }
41
42 ThreadContext::ThreadContext(int tid)
43 : ThreadContextBase(tid),
44 stack_begin_(0),
45 stack_end_(0),
46 cache_begin_(0),
47 cache_end_(0),
48 tls_begin_(0),
49 tls_end_(0),
50 dtls_(nullptr) {}
51
52 struct OnStartedArgs {
53 uptr stack_begin, stack_end,
54 cache_begin, cache_end,
55 tls_begin, tls_end;
56 DTLS *dtls;
57 };
58
59 void ThreadContext::OnStarted(void *arg) {
60 OnStartedArgs *args = reinterpret_cast<OnStartedArgs *>(arg);
61 stack_begin_ = args->stack_begin;
62 stack_end_ = args->stack_end;
63 tls_begin_ = args->tls_begin;
64 tls_end_ = args->tls_end;
65 cache_begin_ = args->cache_begin;
66 cache_end_ = args->cache_end;
67 dtls_ = args->dtls;
68 }
69
70 void ThreadContext::OnFinished() {
71 AllocatorThreadFinish();
72 DTLS_Destroy();
73 }
74
75 u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached) {
76 return thread_registry->CreateThread(user_id, detached, parent_tid,
77 /* arg */ nullptr);
78 }
79
80 void ThreadStart(u32 tid, tid_t os_id, bool workerthread) {
81 OnStartedArgs args;
82 uptr stack_size = 0;
83 uptr tls_size = 0;
84 GetThreadStackAndTls(tid == 0, &args.stack_begin, &stack_size,
85 &args.tls_begin, &tls_size);
86 args.stack_end = args.stack_begin + stack_size;
87 args.tls_end = args.tls_begin + tls_size;
88 GetAllocatorCacheRange(&args.cache_begin, &args.cache_end);
89 args.dtls = DTLS_Get();
90 thread_registry->StartThread(tid, os_id, workerthread, &args);
91 }
92
93 void ThreadFinish() {
94 thread_registry->FinishThread(GetCurrentThread());
95 SetCurrentThread(kInvalidTid);
96 }
97
98 ThreadContext *CurrentThreadContext() {
99 if (!thread_registry) return nullptr;
100 if (GetCurrentThread() == kInvalidTid)
101 return nullptr;
102 // No lock needed when getting current thread.
103 return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
104 }
105
106 static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
107 uptr uid = (uptr)arg;
108 if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
109 return true;
110 }
111 return false;
112 }
113
114 u32 ThreadTid(uptr uid) {
115 return thread_registry->FindThread(FindThreadByUid, (void*)uid);
116 }
117
118 void ThreadJoin(u32 tid) {
119 CHECK_NE(tid, kInvalidTid);
120 thread_registry->JoinThread(tid, /* arg */nullptr);
121 }
122
123 void EnsureMainThreadIDIsCorrect() {
124 if (GetCurrentThread() == 0)
125 CurrentThreadContext()->os_id = GetTid();
126 }
127
128 ///// Interface to the common LSan module. /////
129
130 bool GetThreadRangesLocked(tid_t os_id, uptr *stack_begin, uptr *stack_end,
131 uptr *tls_begin, uptr *tls_end, uptr *cache_begin,
132 uptr *cache_end, DTLS **dtls) {
133 ThreadContext *context = static_cast<ThreadContext *>(
134 thread_registry->FindThreadContextByOsIDLocked(os_id));
135 if (!context) return false;
136 *stack_begin = context->stack_begin();
137 *stack_end = context->stack_end();
138 *tls_begin = context->tls_begin();
139 *tls_end = context->tls_end();
140 *cache_begin = context->cache_begin();
141 *cache_end = context->cache_end();
142 *dtls = context->dtls();
143 return true;
144 }
145
146 void ForEachExtraStackRange(tid_t os_id, RangeIteratorCallback callback,
147 void *arg) {
148 }
149
150 void LockThreadRegistry() {
151 thread_registry->Lock();
152 }
153
154 void UnlockThreadRegistry() {
155 thread_registry->Unlock();
156 }
157
158 } // namespace __lsan