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::__anon417358b60111::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 last->next = cur;
100 last = cur;
101 }
102 CHECK_EQ(addr, first->info.address);
103 CHECK_EQ(addr, last->info.address);
104 return &last->info;
105 }
106 };
107
108 extern "C" {
SymbolizeCodePCInfoCallback(void * vdata,uintptr_t addr,const char * filename,int lineno,const char * function)109 static int SymbolizeCodePCInfoCallback(void *vdata, uintptr_t addr,
110 const char *filename, int lineno,
111 const char *function) {
112 SymbolizeCodeCallbackArg *cdata = (SymbolizeCodeCallbackArg *)vdata;
113 if (function) {
114 AddressInfo *info = cdata->get_new_frame(addr);
115 info->function = DemangleAlloc(function, /*always_alloc*/ true);
116 if (filename)
117 info->file = internal_strdup(filename);
118 info->line = lineno;
119 cdata->frames_symbolized++;
120 }
121 return 0;
122 }
123
SymbolizeCodeCallback(void * vdata,uintptr_t addr,const char * symname,uintptr_t,uintptr_t)124 static void SymbolizeCodeCallback(void *vdata, uintptr_t addr,
125 const char *symname, uintptr_t, uintptr_t) {
126 SymbolizeCodeCallbackArg *cdata = (SymbolizeCodeCallbackArg *)vdata;
127 if (symname) {
128 AddressInfo *info = cdata->get_new_frame(addr);
129 info->function = DemangleAlloc(symname, /*always_alloc*/ true);
130 cdata->frames_symbolized++;
131 }
132 }
133
SymbolizeDataCallback(void * vdata,uintptr_t,const char * symname,uintptr_t symval,uintptr_t symsize)134 static void SymbolizeDataCallback(void *vdata, uintptr_t, const char *symname,
135 uintptr_t symval, uintptr_t symsize) {
136 DataInfo *info = (DataInfo *)vdata;
137 if (symname && symval) {
138 info->name = DemangleAlloc(symname, /*always_alloc*/ true);
139 info->start = symval;
140 info->size = symsize;
141 }
142 }
143
ErrorCallback(void *,const char *,int)144 static void ErrorCallback(void *, const char *, int) {}
145 } // extern "C"
146
147 } // namespace
148
get(LowLevelAllocator * alloc)149 LibbacktraceSymbolizer *LibbacktraceSymbolizer::get(LowLevelAllocator *alloc) {
150 // State created in backtrace_create_state is leaked.
151 void *state = (void *)(backtrace_create_state("/proc/self/exe", 0,
152 ErrorCallback, NULL));
153 if (!state)
154 return 0;
155 return new(*alloc) LibbacktraceSymbolizer(state);
156 }
157
SymbolizePC(uptr addr,SymbolizedStack * stack)158 bool LibbacktraceSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) {
159 SymbolizeCodeCallbackArg data;
160 data.first = stack;
161 data.last = stack;
162 data.frames_symbolized = 0;
163 backtrace_pcinfo((backtrace_state *)state_, addr, SymbolizeCodePCInfoCallback,
164 ErrorCallback, &data);
165 if (data.frames_symbolized > 0)
166 return true;
167 backtrace_syminfo((backtrace_state *)state_, addr, SymbolizeCodeCallback,
168 ErrorCallback, &data);
169 return (data.frames_symbolized > 0);
170 }
171
SymbolizeData(uptr addr,DataInfo * info)172 bool LibbacktraceSymbolizer::SymbolizeData(uptr addr, DataInfo *info) {
173 backtrace_syminfo((backtrace_state *)state_, addr, SymbolizeDataCallback,
174 ErrorCallback, info);
175 return true;
176 }
177
178 #else // SANITIZER_LIBBACKTRACE
179
get(LowLevelAllocator * alloc)180 LibbacktraceSymbolizer *LibbacktraceSymbolizer::get(LowLevelAllocator *alloc) {
181 return 0;
182 }
183
SymbolizePC(uptr addr,SymbolizedStack * stack)184 bool LibbacktraceSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) {
185 (void)state_;
186 return false;
187 }
188
SymbolizeData(uptr addr,DataInfo * info)189 bool LibbacktraceSymbolizer::SymbolizeData(uptr addr, DataInfo *info) {
190 return false;
191 }
192
193 #endif // SANITIZER_LIBBACKTRACE
194
DemangleAlloc(const char * name,bool always_alloc)195 static char *DemangleAlloc(const char *name, bool always_alloc) {
196 #if SANITIZER_LIBBACKTRACE && SANITIZER_CP_DEMANGLE
197 if (char *demangled = CplusV3Demangle(name))
198 return demangled;
199 #endif
200 if (always_alloc)
201 return internal_strdup(name);
202 return 0;
203 }
204
Demangle(const char * name)205 const char *LibbacktraceSymbolizer::Demangle(const char *name) {
206 return DemangleAlloc(name, /*always_alloc*/ false);
207 }
208
209 } // namespace __sanitizer
210