1 //===-- sanitizer_symbolizer.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 shared between AddressSanitizer and ThreadSanitizer
11 // run-time libraries.
12 //===----------------------------------------------------------------------===//
13
14 #include "sanitizer_allocator_internal.h"
15 #include "sanitizer_platform.h"
16 #include "sanitizer_internal_defs.h"
17 #include "sanitizer_libc.h"
18 #include "sanitizer_placement_new.h"
19 #include "sanitizer_symbolizer_internal.h"
20
21 namespace __sanitizer {
22
AddressInfo()23 AddressInfo::AddressInfo() {
24 internal_memset(this, 0, sizeof(AddressInfo));
25 function_offset = kUnknown;
26 }
27
Clear()28 void AddressInfo::Clear() {
29 InternalFree(module);
30 InternalFree(function);
31 InternalFree(file);
32 internal_memset(this, 0, sizeof(AddressInfo));
33 function_offset = kUnknown;
34 }
35
FillModuleInfo(const char * mod_name,uptr mod_offset)36 void AddressInfo::FillModuleInfo(const char *mod_name, uptr mod_offset) {
37 module = internal_strdup(mod_name);
38 module_offset = mod_offset;
39 }
40
SymbolizedStack()41 SymbolizedStack::SymbolizedStack() : next(nullptr), info() {}
42
New(uptr addr)43 SymbolizedStack *SymbolizedStack::New(uptr addr) {
44 void *mem = InternalAlloc(sizeof(SymbolizedStack));
45 SymbolizedStack *res = new(mem) SymbolizedStack();
46 res->info.address = addr;
47 return res;
48 }
49
ClearAll()50 void SymbolizedStack::ClearAll() {
51 info.Clear();
52 if (next)
53 next->ClearAll();
54 InternalFree(this);
55 }
56
DataInfo()57 DataInfo::DataInfo() {
58 internal_memset(this, 0, sizeof(DataInfo));
59 }
60
Clear()61 void DataInfo::Clear() {
62 InternalFree(module);
63 InternalFree(file);
64 InternalFree(name);
65 internal_memset(this, 0, sizeof(DataInfo));
66 }
67
68 Symbolizer *Symbolizer::symbolizer_;
69 StaticSpinMutex Symbolizer::init_mu_;
70 LowLevelAllocator Symbolizer::symbolizer_allocator_;
71
AddHooks(Symbolizer::StartSymbolizationHook start_hook,Symbolizer::EndSymbolizationHook end_hook)72 void Symbolizer::AddHooks(Symbolizer::StartSymbolizationHook start_hook,
73 Symbolizer::EndSymbolizationHook end_hook) {
74 CHECK(start_hook_ == 0 && end_hook_ == 0);
75 start_hook_ = start_hook;
76 end_hook_ = end_hook;
77 }
78
GetOwnedCopy(const char * str)79 const char *Symbolizer::ModuleNameOwner::GetOwnedCopy(const char *str) {
80 mu_->CheckLocked();
81
82 // 'str' will be the same string multiple times in a row, optimize this case.
83 if (last_match_ && !internal_strcmp(last_match_, str))
84 return last_match_;
85
86 // FIXME: this is linear search.
87 // We should optimize this further if this turns out to be a bottleneck later.
88 for (uptr i = 0; i < storage_.size(); ++i) {
89 if (!internal_strcmp(storage_[i], str)) {
90 last_match_ = storage_[i];
91 return last_match_;
92 }
93 }
94 last_match_ = internal_strdup(str);
95 storage_.push_back(last_match_);
96 return last_match_;
97 }
98
Symbolizer(IntrusiveList<SymbolizerTool> tools)99 Symbolizer::Symbolizer(IntrusiveList<SymbolizerTool> tools)
100 : module_names_(&mu_), modules_(), modules_fresh_(false), tools_(tools),
101 start_hook_(0), end_hook_(0) {}
102
SymbolizerScope(const Symbolizer * sym)103 Symbolizer::SymbolizerScope::SymbolizerScope(const Symbolizer *sym)
104 : sym_(sym) {
105 if (sym_->start_hook_)
106 sym_->start_hook_();
107 }
108
~SymbolizerScope()109 Symbolizer::SymbolizerScope::~SymbolizerScope() {
110 if (sym_->end_hook_)
111 sym_->end_hook_();
112 }
113
114 } // namespace __sanitizer
115