asan_thread.h revision cc347222d55967fdb775429a8a0a3a5d795b8b50 
1//===-- asan_thread.h -------------------------------------------*- C++ -*-===//
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 AddressSanitizer, an address sanity checker.
11//
12// ASan-private header for asan_thread.cc.
13//===----------------------------------------------------------------------===//
14#ifndef ASAN_THREAD_H
15#define ASAN_THREAD_H
16
17#include "asan_allocator.h"
18#include "asan_internal.h"
19#include "asan_stack.h"
20#include "asan_stats.h"
21#include "sanitizer_common/sanitizer_libc.h"
22
23namespace __asan {
24
25const u32 kInvalidTid = 0xffffff;  // Must fit into 24 bits.
26
27class AsanThread;
28
29// These objects are created for every thread and are never deleted,
30// so we can find them by tid even if the thread is long dead.
31class AsanThreadSummary {
32 public:
33  explicit AsanThreadSummary(LinkerInitialized) { }  // for T0.
34  void Init(u32 parent_tid, StackTrace *stack) {
35    parent_tid_ = parent_tid;
36    announced_ = false;
37    tid_ = kInvalidTid;
38    if (stack) {
39      internal_memcpy(&stack_, stack, sizeof(*stack));
40    }
41    thread_ = 0;
42  }
43  void Announce() {
44    if (tid_ == 0) return;  // no need to announce the main thread.
45    if (!announced_) {
46      announced_ = true;
47      Printf("Thread T%d created by T%d here:\n", tid_, parent_tid_);
48      PrintStack(&stack_);
49    }
50  }
51  u32 tid() { return tid_; }
52  void set_tid(u32 tid) { tid_ = tid; }
53  AsanThread *thread() { return thread_; }
54  void set_thread(AsanThread *thread) { thread_ = thread; }
55  static void TSDDtor(void *tsd);
56
57 private:
58  u32 tid_;
59  u32 parent_tid_;
60  bool announced_;
61  StackTrace stack_;
62  AsanThread *thread_;
63};
64
65// AsanThread are stored in TSD and destroyed when the thread dies.
66class AsanThread {
67 public:
68  explicit AsanThread(LinkerInitialized);  // for T0.
69  static AsanThread *Create(u32 parent_tid, thread_callback_t start_routine,
70                            void *arg, StackTrace *stack);
71  void Destroy();
72
73  void Init();  // Should be called from the thread itself.
74  thread_return_t ThreadStart();
75
76  uptr stack_top() { return stack_top_; }
77  uptr stack_bottom() { return stack_bottom_; }
78  uptr stack_size() { return stack_top_ - stack_bottom_; }
79  u32 tid() { return summary_->tid(); }
80  AsanThreadSummary *summary() { return summary_; }
81  void set_summary(AsanThreadSummary *summary) { summary_ = summary; }
82
83  const char *GetFrameNameByAddr(uptr addr, uptr *offset);
84
85  bool AddrIsInStack(uptr addr) {
86    return addr >= stack_bottom_ && addr < stack_top_;
87  }
88
89  FakeStack &fake_stack() { return fake_stack_; }
90  AsanThreadLocalMallocStorage &malloc_storage() { return malloc_storage_; }
91  AsanStats &stats() { return stats_; }
92
93 private:
94
95  void SetThreadStackTopAndBottom();
96  void ClearShadowForThreadStack();
97  AsanThreadSummary *summary_;
98  thread_callback_t start_routine_;
99  void *arg_;
100  uptr  stack_top_;
101  uptr  stack_bottom_;
102
103  FakeStack fake_stack_;
104  AsanThreadLocalMallocStorage malloc_storage_;
105  AsanStats stats_;
106};
107
108}  // namespace __asan
109
110#endif  // ASAN_THREAD_H
111