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1 //=-- lsan_thread.cpp -----------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file is a part of LeakSanitizer.
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10 // See lsan_thread.h for details.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "lsan_thread.h"
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15
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16 #include "sanitizer_common/sanitizer_common.h"
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17 #include "sanitizer_common/sanitizer_placement_new.h"
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18 #include "sanitizer_common/sanitizer_thread_registry.h"
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19 #include "sanitizer_common/sanitizer_tls_get_addr.h"
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20 #include "lsan_allocator.h"
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21 #include "lsan_common.h"
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22
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23 namespace __lsan {
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24
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25 static ThreadRegistry *thread_registry;
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26
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27 static ThreadContextBase *CreateThreadContext(u32 tid) {
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28 void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
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29 return new(mem) ThreadContext(tid);
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30 }
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31
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32 static const uptr kMaxThreads = 1 << 13;
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33 static const uptr kThreadQuarantineSize = 64;
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34
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35 void InitializeThreadRegistry() {
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36 static ALIGNED(64) char thread_registry_placeholder[sizeof(ThreadRegistry)];
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37 thread_registry = new(thread_registry_placeholder)
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38 ThreadRegistry(CreateThreadContext, kMaxThreads, kThreadQuarantineSize);
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39 }
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40
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41 ThreadContext::ThreadContext(int tid)
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42 : ThreadContextBase(tid),
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43 stack_begin_(0),
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44 stack_end_(0),
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45 cache_begin_(0),
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46 cache_end_(0),
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47 tls_begin_(0),
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48 tls_end_(0),
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49 dtls_(nullptr) {}
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50
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51 struct OnStartedArgs {
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52 uptr stack_begin, stack_end,
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53 cache_begin, cache_end,
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54 tls_begin, tls_end;
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55 DTLS *dtls;
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56 };
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57
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58 void ThreadContext::OnStarted(void *arg) {
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59 OnStartedArgs *args = reinterpret_cast<OnStartedArgs *>(arg);
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60 stack_begin_ = args->stack_begin;
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61 stack_end_ = args->stack_end;
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62 tls_begin_ = args->tls_begin;
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63 tls_end_ = args->tls_end;
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64 cache_begin_ = args->cache_begin;
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65 cache_end_ = args->cache_end;
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66 dtls_ = args->dtls;
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67 }
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68
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69 void ThreadContext::OnFinished() {
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70 AllocatorThreadFinish();
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71 DTLS_Destroy();
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72 }
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73
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74 u32 ThreadCreate(u32 parent_tid, uptr user_id, bool detached) {
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75 return thread_registry->CreateThread(user_id, detached, parent_tid,
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76 /* arg */ nullptr);
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77 }
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78
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79 void ThreadStart(u32 tid, tid_t os_id, ThreadType thread_type) {
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80 OnStartedArgs args;
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81 uptr stack_size = 0;
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82 uptr tls_size = 0;
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83 GetThreadStackAndTls(tid == 0, &args.stack_begin, &stack_size,
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84 &args.tls_begin, &tls_size);
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85 args.stack_end = args.stack_begin + stack_size;
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86 args.tls_end = args.tls_begin + tls_size;
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87 GetAllocatorCacheRange(&args.cache_begin, &args.cache_end);
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88 args.dtls = DTLS_Get();
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89 thread_registry->StartThread(tid, os_id, thread_type, &args);
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90 }
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91
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92 void ThreadFinish() {
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93 thread_registry->FinishThread(GetCurrentThread());
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94 SetCurrentThread(kInvalidTid);
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95 }
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96
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97 ThreadContext *CurrentThreadContext() {
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98 if (!thread_registry) return nullptr;
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99 if (GetCurrentThread() == kInvalidTid)
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100 return nullptr;
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101 // No lock needed when getting current thread.
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102 return (ThreadContext *)thread_registry->GetThreadLocked(GetCurrentThread());
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103 }
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104
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105 static bool FindThreadByUid(ThreadContextBase *tctx, void *arg) {
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106 uptr uid = (uptr)arg;
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107 if (tctx->user_id == uid && tctx->status != ThreadStatusInvalid) {
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108 return true;
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109 }
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110 return false;
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111 }
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112
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113 u32 ThreadTid(uptr uid) {
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114 return thread_registry->FindThread(FindThreadByUid, (void*)uid);
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115 }
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116
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117 void ThreadJoin(u32 tid) {
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118 CHECK_NE(tid, kInvalidTid);
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119 thread_registry->JoinThread(tid, /* arg */nullptr);
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120 }
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121
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122 void EnsureMainThreadIDIsCorrect() {
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123 if (GetCurrentThread() == 0)
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124 CurrentThreadContext()->os_id = GetTid();
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125 }
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126
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127 ///// Interface to the common LSan module. /////
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128
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129 bool GetThreadRangesLocked(tid_t os_id, uptr *stack_begin, uptr *stack_end,
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130 uptr *tls_begin, uptr *tls_end, uptr *cache_begin,
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131 uptr *cache_end, DTLS **dtls) {
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132 ThreadContext *context = static_cast<ThreadContext *>(
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133 thread_registry->FindThreadContextByOsIDLocked(os_id));
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134 if (!context) return false;
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135 *stack_begin = context->stack_begin();
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136 *stack_end = context->stack_end();
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137 *tls_begin = context->tls_begin();
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138 *tls_end = context->tls_end();
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139 *cache_begin = context->cache_begin();
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140 *cache_end = context->cache_end();
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141 *dtls = context->dtls();
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142 return true;
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143 }
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144
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145 void ForEachExtraStackRange(tid_t os_id, RangeIteratorCallback callback,
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146 void *arg) {
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147 }
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148
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149 void LockThreadRegistry() {
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150 thread_registry->Lock();
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151 }
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152
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153 void UnlockThreadRegistry() {
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154 thread_registry->Unlock();
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155 }
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156
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157 ThreadRegistry *GetThreadRegistryLocked() {
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158 thread_registry->CheckLocked();
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159 return thread_registry;
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160 }
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161
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162 } // namespace __lsan
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