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1a4d82fc JJ |
1 | //===-- sanitizer_libignore.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 | // LibIgnore allows to ignore all interceptors called from a particular set | |
92a42be0 SL |
11 | // of dynamic libraries. LibIgnore can be initialized with several templates |
12 | // of names of libraries to be ignored. It finds code ranges for the libraries; | |
1a4d82fc JJ |
13 | // and checks whether the provided PC value belongs to the code ranges. |
14 | // | |
15 | //===----------------------------------------------------------------------===// | |
16 | ||
17 | #ifndef SANITIZER_LIBIGNORE_H | |
18 | #define SANITIZER_LIBIGNORE_H | |
19 | ||
20 | #include "sanitizer_internal_defs.h" | |
21 | #include "sanitizer_common.h" | |
1a4d82fc JJ |
22 | #include "sanitizer_atomic.h" |
23 | #include "sanitizer_mutex.h" | |
24 | ||
25 | namespace __sanitizer { | |
26 | ||
27 | class LibIgnore { | |
28 | public: | |
29 | explicit LibIgnore(LinkerInitialized); | |
30 | ||
92a42be0 SL |
31 | // Must be called during initialization. |
32 | void AddIgnoredLibrary(const char *name_templ); | |
1a4d82fc JJ |
33 | |
34 | // Must be called after a new dynamic library is loaded. | |
35 | void OnLibraryLoaded(const char *name); | |
36 | ||
37 | // Must be called after a dynamic library is unloaded. | |
38 | void OnLibraryUnloaded(); | |
39 | ||
40 | // Checks whether the provided PC belongs to one of the ignored libraries. | |
41 | bool IsIgnored(uptr pc) const; | |
42 | ||
43 | private: | |
44 | struct Lib { | |
45 | char *templ; | |
46 | char *name; | |
47 | char *real_name; // target of symlink | |
48 | bool loaded; | |
49 | }; | |
50 | ||
51 | struct LibCodeRange { | |
52 | uptr begin; | |
53 | uptr end; | |
54 | }; | |
55 | ||
56 | static const uptr kMaxLibs = 128; | |
57 | ||
58 | // Hot part: | |
59 | atomic_uintptr_t loaded_count_; | |
60 | LibCodeRange code_ranges_[kMaxLibs]; | |
61 | ||
62 | // Cold part: | |
63 | BlockingMutex mutex_; | |
64 | uptr count_; | |
65 | Lib libs_[kMaxLibs]; | |
66 | ||
67 | // Disallow copying of LibIgnore objects. | |
68 | LibIgnore(const LibIgnore&); // not implemented | |
69 | void operator = (const LibIgnore&); // not implemented | |
70 | }; | |
71 | ||
72 | inline bool LibIgnore::IsIgnored(uptr pc) const { | |
73 | const uptr n = atomic_load(&loaded_count_, memory_order_acquire); | |
74 | for (uptr i = 0; i < n; i++) { | |
75 | if (pc >= code_ranges_[i].begin && pc < code_ranges_[i].end) | |
76 | return true; | |
77 | } | |
78 | return false; | |
79 | } | |
80 | ||
81 | } // namespace __sanitizer | |
82 | ||
83 | #endif // SANITIZER_LIBIGNORE_H |