1 //===-- sanitizer_symbolizer.cpp ------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is shared between AddressSanitizer and ThreadSanitizer
10 // run-time libraries.
11 //===----------------------------------------------------------------------===//
12 
13 #include "sanitizer_allocator_internal.h"
14 #include "sanitizer_common.h"
15 #include "sanitizer_internal_defs.h"
16 #include "sanitizer_libc.h"
17 #include "sanitizer_placement_new.h"
18 #include "sanitizer_platform.h"
19 #include "sanitizer_symbolizer_internal.h"
20 
21 namespace __sanitizer {
22 
23 AddressInfo::AddressInfo() {
24   internal_memset(this, 0, sizeof(AddressInfo));
25   function_offset = kUnknown;
26 }
27 
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   uuid_size = 0;
35 }
36 
37 void AddressInfo::FillModuleInfo(const char *mod_name, uptr mod_offset,
38                                  ModuleArch mod_arch) {
39   module = internal_strdup(mod_name);
40   module_offset = mod_offset;
41   module_arch = mod_arch;
42   uuid_size = 0;
43 }
44 
45 void AddressInfo::FillModuleInfo(const LoadedModule &mod) {
46   module = internal_strdup(mod.full_name());
47   module_offset = address - mod.base_address();
48   module_arch = mod.arch();
49   if (mod.uuid_size())
50     internal_memcpy(uuid, mod.uuid(), mod.uuid_size());
51   uuid_size = mod.uuid_size();
52 }
53 
54 SymbolizedStack::SymbolizedStack() : next(nullptr), info() {}
55 
56 SymbolizedStack *SymbolizedStack::New(uptr addr) {
57   void *mem = InternalAlloc(sizeof(SymbolizedStack));
58   SymbolizedStack *res = new(mem) SymbolizedStack();
59   res->info.address = addr;
60   return res;
61 }
62 
63 void SymbolizedStack::ClearAll() {
64   info.Clear();
65   if (next)
66     next->ClearAll();
67   InternalFree(this);
68 }
69 
70 DataInfo::DataInfo() {
71   internal_memset(this, 0, sizeof(DataInfo));
72 }
73 
74 void DataInfo::Clear() {
75   InternalFree(module);
76   InternalFree(file);
77   InternalFree(name);
78   internal_memset(this, 0, sizeof(DataInfo));
79 }
80 
81 void FrameInfo::Clear() {
82   InternalFree(module);
83   for (LocalInfo &local : locals) {
84     InternalFree(local.function_name);
85     InternalFree(local.name);
86     InternalFree(local.decl_file);
87   }
88   locals.clear();
89 }
90 
91 Symbolizer *Symbolizer::symbolizer_;
92 StaticSpinMutex Symbolizer::init_mu_;
93 LowLevelAllocator Symbolizer::symbolizer_allocator_;
94 
95 void Symbolizer::InvalidateModuleList() {
96   modules_fresh_ = false;
97 }
98 
99 void Symbolizer::AddHooks(Symbolizer::StartSymbolizationHook start_hook,
100                           Symbolizer::EndSymbolizationHook end_hook) {
101   CHECK(start_hook_ == 0 && end_hook_ == 0);
102   start_hook_ = start_hook;
103   end_hook_ = end_hook;
104 }
105 
106 const char *Symbolizer::ModuleNameOwner::GetOwnedCopy(const char *str) {
107   mu_->CheckLocked();
108 
109   // 'str' will be the same string multiple times in a row, optimize this case.
110   if (last_match_ && !internal_strcmp(last_match_, str))
111     return last_match_;
112 
113   // FIXME: this is linear search.
114   // We should optimize this further if this turns out to be a bottleneck later.
115   for (uptr i = 0; i < storage_.size(); ++i) {
116     if (!internal_strcmp(storage_[i], str)) {
117       last_match_ = storage_[i];
118       return last_match_;
119     }
120   }
121   last_match_ = internal_strdup(str);
122   storage_.push_back(last_match_);
123   return last_match_;
124 }
125 
126 Symbolizer::Symbolizer(IntrusiveList<SymbolizerTool> tools)
127     : module_names_(&mu_), modules_(), modules_fresh_(false), tools_(tools),
128       start_hook_(0), end_hook_(0) {}
129 
130 Symbolizer::SymbolizerScope::SymbolizerScope(const Symbolizer *sym)
131     : sym_(sym) {
132   if (sym_->start_hook_)
133     sym_->start_hook_();
134 }
135 
136 Symbolizer::SymbolizerScope::~SymbolizerScope() {
137   if (sym_->end_hook_)
138     sym_->end_hook_();
139 }
140 
141 }  // namespace __sanitizer
142