1 //===-- sanitizer_symbolizer_libbacktrace.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 // Libbacktrace implementation of symbolizer parts.
13 //===----------------------------------------------------------------------===//
14
15 #include "sanitizer_platform.h"
16
17 #include "sanitizer_internal_defs.h"
18 #include "sanitizer_symbolizer.h"
19 #include "sanitizer_symbolizer_libbacktrace.h"
20
21 #if SANITIZER_LIBBACKTRACE
22 # include "backtrace-supported.h"
23 # if SANITIZER_POSIX && BACKTRACE_SUPPORTED && !BACKTRACE_USES_MALLOC
24 # include "backtrace.h"
25 # if SANITIZER_CP_DEMANGLE
26 # undef ARRAY_SIZE
27 # include "demangle.h"
28 # endif
29 # else
30 # define SANITIZER_LIBBACKTRACE 0
31 # endif
32 #endif
33
34 namespace __sanitizer {
35
36 static char *DemangleAlloc(const char *name, bool always_alloc);
37
38 #if SANITIZER_LIBBACKTRACE
39
40 namespace {
41
42 # if SANITIZER_CP_DEMANGLE
43 struct CplusV3DemangleData {
44 char *buf;
45 uptr size, allocated;
46 };
47
48 extern "C" {
CplusV3DemangleCallback(const char * s,size_t l,void * vdata)49 static void CplusV3DemangleCallback(const char *s, size_t l, void *vdata) {
50 CplusV3DemangleData *data = (CplusV3DemangleData *)vdata;
51 uptr needed = data->size + l + 1;
52 if (needed > data->allocated) {
53 data->allocated *= 2;
54 if (needed > data->allocated)
55 data->allocated = needed;
56 char *buf = (char *)InternalAlloc(data->allocated);
57 if (data->buf) {
58 internal_memcpy(buf, data->buf, data->size);
59 InternalFree(data->buf);
60 }
61 data->buf = buf;
62 }
63 internal_memcpy(data->buf + data->size, s, l);
64 data->buf[data->size + l] = '\0';
65 data->size += l;
66 }
67 } // extern "C"
68
CplusV3Demangle(const char * name)69 char *CplusV3Demangle(const char *name) {
70 CplusV3DemangleData data;
71 data.buf = 0;
72 data.size = 0;
73 data.allocated = 0;
74 if (cplus_demangle_v3_callback(name, DMGL_PARAMS | DMGL_ANSI,
75 CplusV3DemangleCallback, &data)) {
76 if (data.size + 64 > data.allocated)
77 return data.buf;
78 char *buf = internal_strdup(data.buf);
79 InternalFree(data.buf);
80 return buf;
81 }
82 if (data.buf)
83 InternalFree(data.buf);
84 return 0;
85 }
86 # endif // SANITIZER_CP_DEMANGLE
87
88 struct SymbolizeCodeCallbackArg {
89 SymbolizedStack *first;
90 SymbolizedStack *last;
91 uptr frames_symbolized;
92
get_new_frame__sanitizer::__anon3eb851350111::SymbolizeCodeCallbackArg93 AddressInfo *get_new_frame(uintptr_t addr) {
94 CHECK(last);
95 if (frames_symbolized > 0) {
96 SymbolizedStack *cur = SymbolizedStack::New(addr);
97 AddressInfo *info = &cur->info;
98 info->FillModuleInfo(first->info.module, first->info.module_offset,
99 first->info.module_arch);
100 last->next = cur;
101 last = cur;
102 }
103 CHECK_EQ(addr, first->info.address);
104 CHECK_EQ(addr, last->info.address);
105 return &last->info;
106 }
107 };
108
109 extern "C" {
SymbolizeCodePCInfoCallback(void * vdata,uintptr_t addr,const char * filename,int lineno,const char * function)110 static int SymbolizeCodePCInfoCallback(void *vdata, uintptr_t addr,
111 const char *filename, int lineno,
112 const char *function) {
113 SymbolizeCodeCallbackArg *cdata = (SymbolizeCodeCallbackArg *)vdata;
114 if (function) {
115 AddressInfo *info = cdata->get_new_frame(addr);
116 info->function = DemangleAlloc(function, /*always_alloc*/ true);
117 if (filename)
118 info->file = internal_strdup(filename);
119 info->line = lineno;
120 cdata->frames_symbolized++;
121 }
122 return 0;
123 }
124
SymbolizeCodeCallback(void * vdata,uintptr_t addr,const char * symname,uintptr_t,uintptr_t)125 static void SymbolizeCodeCallback(void *vdata, uintptr_t addr,
126 const char *symname, uintptr_t, uintptr_t) {
127 SymbolizeCodeCallbackArg *cdata = (SymbolizeCodeCallbackArg *)vdata;
128 if (symname) {
129 AddressInfo *info = cdata->get_new_frame(addr);
130 info->function = DemangleAlloc(symname, /*always_alloc*/ true);
131 cdata->frames_symbolized++;
132 }
133 }
134
SymbolizeDataCallback(void * vdata,uintptr_t,const char * symname,uintptr_t symval,uintptr_t symsize)135 static void SymbolizeDataCallback(void *vdata, uintptr_t, const char *symname,
136 uintptr_t symval, uintptr_t symsize) {
137 DataInfo *info = (DataInfo *)vdata;
138 if (symname && symval) {
139 info->name = DemangleAlloc(symname, /*always_alloc*/ true);
140 info->start = symval;
141 info->size = symsize;
142 }
143 }
144
ErrorCallback(void *,const char *,int)145 static void ErrorCallback(void *, const char *, int) {}
146 } // extern "C"
147
148 } // namespace
149
get(LowLevelAllocator * alloc)150 LibbacktraceSymbolizer *LibbacktraceSymbolizer::get(LowLevelAllocator *alloc) {
151 // State created in backtrace_create_state is leaked.
152 void *state = (void *)(backtrace_create_state("/proc/self/exe", 0,
153 ErrorCallback, NULL));
154 if (!state)
155 return 0;
156 return new(*alloc) LibbacktraceSymbolizer(state);
157 }
158
SymbolizePC(uptr addr,SymbolizedStack * stack)159 bool LibbacktraceSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) {
160 SymbolizeCodeCallbackArg data;
161 data.first = stack;
162 data.last = stack;
163 data.frames_symbolized = 0;
164 backtrace_pcinfo((backtrace_state *)state_, addr, SymbolizeCodePCInfoCallback,
165 ErrorCallback, &data);
166 if (data.frames_symbolized > 0)
167 return true;
168 backtrace_syminfo((backtrace_state *)state_, addr, SymbolizeCodeCallback,
169 ErrorCallback, &data);
170 return (data.frames_symbolized > 0);
171 }
172
SymbolizeData(uptr addr,DataInfo * info)173 bool LibbacktraceSymbolizer::SymbolizeData(uptr addr, DataInfo *info) {
174 backtrace_syminfo((backtrace_state *)state_, addr, SymbolizeDataCallback,
175 ErrorCallback, info);
176 return true;
177 }
178
179 #else // SANITIZER_LIBBACKTRACE
180
get(LowLevelAllocator * alloc)181 LibbacktraceSymbolizer *LibbacktraceSymbolizer::get(LowLevelAllocator *alloc) {
182 return 0;
183 }
184
SymbolizePC(uptr addr,SymbolizedStack * stack)185 bool LibbacktraceSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) {
186 (void)state_;
187 return false;
188 }
189
SymbolizeData(uptr addr,DataInfo * info)190 bool LibbacktraceSymbolizer::SymbolizeData(uptr addr, DataInfo *info) {
191 return false;
192 }
193
194 #endif // SANITIZER_LIBBACKTRACE
195
DemangleAlloc(const char * name,bool always_alloc)196 static char *DemangleAlloc(const char *name, bool always_alloc) {
197 #if SANITIZER_LIBBACKTRACE && SANITIZER_CP_DEMANGLE
198 if (char *demangled = CplusV3Demangle(name))
199 return demangled;
200 #endif
201 if (always_alloc)
202 return internal_strdup(name);
203 return 0;
204 }
205
Demangle(const char * name)206 const char *LibbacktraceSymbolizer::Demangle(const char *name) {
207 return DemangleAlloc(name, /*always_alloc*/ false);
208 }
209
210 } // namespace __sanitizer
211