aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/gallium/auxiliary/util/u_debug_symbol.c
blob: 542493252ce0230dbadd2ddcc6db9958a72a7925 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
/**************************************************************************
 * 
 * Copyright 2009 VMware, Inc.
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 **************************************************************************/

/**
 * @file
 * Symbol lookup.
 * 
 * @author Jose Fonseca <jfonseca@vmware.com>
 */

#include "pipe/p_compiler.h"
#include "os/os_thread.h"
#include "u_string.h"

#include "u_debug.h"
#include "u_debug_symbol.h"
#include "u_hash_table.h"


#if defined(PIPE_OS_WINDOWS)
   
#include <windows.h>
#include <stddef.h>

#include "dbghelp.h"


/**
 * SymInitialize() must be called once for each process (in this case, the
 * current process), before any of the other functions can be called.
 */
static BOOL g_bSymInitialized = FALSE;


/**
 * Lookup the address of a DbgHelp function.
 */
static FARPROC WINAPI
getDbgHelpProcAddress(LPCSTR lpProcName)
{
   static HMODULE hModule = NULL;

   if (!hModule) {
      static boolean bail = FALSE;

      if (bail) {
         return NULL;
      }

#ifdef PIPE_CC_GCC
      /*
       * DbgHelp does not understand the debug information generated by MinGW toolchain.
       *
       * mgwhelp.dll is a dbghelp.dll look-alike replacement, which is able to
       * understand MinGW symbols, including on 64-bit builds.
       */
      if (!hModule) {
         hModule = LoadLibraryA("mgwhelp.dll");
         if (!hModule) {
            _debug_printf("warning: mgwhelp.dll not found: symbol names will not be resolved\n"
                          "warning: download it from https://github.com/jrfonseca/drmingw/#mgwhelp\n");
         }
      }
#endif

      /*
       * Fallback to the real DbgHelp.
       */
      if (!hModule) {
         hModule = LoadLibraryA("dbghelp.dll");
      }

      if (!hModule) {
         bail = TRUE;
         return NULL;
      }
   }

   return GetProcAddress(hModule, lpProcName);
}


/**
 * Generic macro to dispatch a DbgHelp functions.
 */
#define DBGHELP_DISPATCH(_name, _ret_type, _ret_default, _arg_types, _arg_names) \
   static _ret_type WINAPI \
   j_##_name _arg_types \
   { \
      typedef BOOL (WINAPI *PFN) _arg_types; \
      static PFN pfn = NULL; \
      if (!pfn) { \
         pfn = (PFN) getDbgHelpProcAddress(#_name); \
         if (!pfn) { \
            return _ret_default; \
         } \
      } \
      return pfn _arg_names; \
   }

DBGHELP_DISPATCH(SymInitialize,
                 BOOL, 0,
                 (HANDLE hProcess, PSTR UserSearchPath, BOOL fInvadeProcess),
                 (hProcess, UserSearchPath, fInvadeProcess))

DBGHELP_DISPATCH(SymSetOptions,
                 DWORD, FALSE,
                 (DWORD SymOptions),
                 (SymOptions))

DBGHELP_DISPATCH(SymFromAddr,
                 BOOL, FALSE,
                 (HANDLE hProcess, DWORD64 Address, PDWORD64 Displacement, PSYMBOL_INFO Symbol),
                 (hProcess, Address, Displacement, Symbol))

DBGHELP_DISPATCH(SymGetLineFromAddr64,
                 BOOL, FALSE,
                 (HANDLE hProcess, DWORD64 dwAddr, PDWORD pdwDisplacement, PIMAGEHLP_LINE64 Line),
                 (hProcess, dwAddr, pdwDisplacement, Line))


#undef DBGHELP_DISPATCH


static INLINE boolean
debug_symbol_name_dbghelp(const void *addr, char* buf, unsigned size)
{
   DWORD64 dwAddr = (DWORD64)(uintptr_t)addr;
   HANDLE hProcess = GetCurrentProcess();

   /* General purpose buffer, to back pSymbol and other temporary stuff.
    * Must not be too memory hungry here to avoid stack overflows.
    */
   CHAR buffer[512];

   PSYMBOL_INFO pSymbol = (PSYMBOL_INFO) buffer;
   DWORD64 dwDisplacement = 0;  /* Displacement of the input address, relative to the start of the symbol */
   DWORD dwLineDisplacement = 0;
   IMAGEHLP_LINE64 Line;

   memset(pSymbol, 0, sizeof *pSymbol);
   pSymbol->SizeOfStruct = sizeof buffer;
   pSymbol->MaxNameLen = sizeof buffer - offsetof(SYMBOL_INFO, Name);

   if (!g_bSymInitialized) {
      j_SymSetOptions(/* SYMOPT_UNDNAME | */ SYMOPT_LOAD_LINES);
      if (j_SymInitialize(hProcess, NULL, TRUE)) {
         g_bSymInitialized = TRUE;
      }
   }

   /* Lookup symbol name */
   if (!g_bSymInitialized ||
       !j_SymFromAddr(hProcess, dwAddr, &dwDisplacement, pSymbol)) {
      /*
       * We couldn't obtain symbol information.  At least tell which module the address belongs.
       */

      HMODULE hModule = NULL;

      if (!GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
                             (LPCTSTR)addr,
                             &hModule)) {
         return FALSE;
      }

      if (GetModuleFileNameA(hModule, buffer, sizeof buffer) == sizeof buffer) {
         return FALSE;
      }
      util_snprintf(buf, size, "%p at %s+0x%lx",
                    addr, buffer,
                    (unsigned long)((uintptr_t)addr - (uintptr_t)hModule));

      return TRUE;
   }

   /*
    * Try to get filename and line number.
    */
   memset(&Line, 0, sizeof Line);
   Line.SizeOfStruct = sizeof Line;
   if (!j_SymGetLineFromAddr64(hProcess, dwAddr, &dwLineDisplacement, &Line)) {
      Line.FileName = NULL;
   }

   if (Line.FileName) {
      util_snprintf(buf, size, "%s at %s:%lu", pSymbol->Name, Line.FileName, Line.LineNumber);
   } else {
      util_snprintf(buf, size, "%s", pSymbol->Name);
   }

   return TRUE;
}

#endif /* PIPE_OS_WINDOWS */


#if defined(__GLIBC__) && !defined(__UCLIBC__)

#include <execinfo.h>

/* This can only provide dynamic symbols, or binary offsets into a file.
 *
 * To fix this, post-process the output with tools/addr2line.sh
 */
static INLINE boolean
debug_symbol_name_glibc(const void *addr, char* buf, unsigned size)
{
   char** syms = backtrace_symbols((void**)&addr, 1);
   if (!syms) {
      return FALSE;
   }
   strncpy(buf, syms[0], size);
   buf[size - 1] = 0;
   free(syms);
   return TRUE;
}

#endif /* defined(__GLIBC__) && !defined(__UCLIBC__) */


void
debug_symbol_name(const void *addr, char* buf, unsigned size)
{
#if defined(PIPE_OS_WINDOWS)
   if (debug_symbol_name_dbghelp(addr, buf, size)) {
      return;
   }
#endif

#if defined(__GLIBC__) && !defined(__UCLIBC__)
   if (debug_symbol_name_glibc(addr, buf, size)) {
       return;
   }
#endif

   util_snprintf(buf, size, "%p", addr);
   buf[size - 1] = 0;
}

void
debug_symbol_print(const void *addr)
{
   char buf[1024];
   debug_symbol_name(addr, buf, sizeof(buf));
   debug_printf("\t%s\n", buf);
}

struct util_hash_table* symbols_hash;
pipe_static_mutex(symbols_mutex);

static unsigned hash_ptr(void* p)
{
   return (unsigned)(uintptr_t)p;
}

static int compare_ptr(void* a, void* b)
{
   if(a == b)
      return 0;
   else if(a < b)
      return -1;
   else
      return 1;
}

const char*
debug_symbol_name_cached(const void *addr)
{
   const char* name;
#ifdef PIPE_SUBSYSTEM_WINDOWS_USER
   static boolean first = TRUE;

   if (first) {
      pipe_mutex_init(symbols_mutex);
      first = FALSE;
   }
#endif

   pipe_mutex_lock(symbols_mutex);
   if(!symbols_hash)
      symbols_hash = util_hash_table_create(hash_ptr, compare_ptr);
   name = util_hash_table_get(symbols_hash, (void*)addr);
   if(!name)
   {
      char buf[1024];
      debug_symbol_name(addr, buf, sizeof(buf));
      name = strdup(buf);

      util_hash_table_set(symbols_hash, (void*)addr, (void*)name);
   }
   pipe_mutex_unlock(symbols_mutex);
   return name;
}