tools/perf/util/debug.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* For general debugging purposes */
   3
   4 #include "../perf.h"
   5
   6 #include <inttypes.h>
   7 #include <string.h>
   8 #include <stdarg.h>
   9 #include <stdio.h>
  10 #include <sys/wait.h>
  11 #include <api/debug.h>
  12 #include <linux/time64.h>
  13 #ifdef HAVE_BACKTRACE_SUPPORT
  14 #include <execinfo.h>
  15 #endif
  16 #include "cache.h"
  17 #include "color.h"
  18 #include "event.h"
  19 #include "debug.h"
  20 #include "print_binary.h"
  21 #include "util.h"
  22 #include "target.h"
  23
  24 #include "sane_ctype.h"
  25
  26 int verbose;
  27 bool dump_trace = false, quiet = false;
  28 int debug_ordered_events;
  29 static int redirect_to_stderr;
  30 int debug_data_convert;
  31
  32 int veprintf(int level, int var, const char *fmt, va_list args)
  33 {
  34         int ret = 0;
  35
  36         if (var >= level) {
  37                 if (use_browser >= 1 && !redirect_to_stderr)
  38                         ui_helpline__vshow(fmt, args);
  39                 else
  40                         ret = vfprintf(stderr, fmt, args);
  41         }
  42
  43         return ret;
  44 }
  45
  46 int eprintf(int level, int var, const char *fmt, ...)
  47 {
  48         va_list args;
  49         int ret;
  50
  51         va_start(args, fmt);
  52         ret = veprintf(level, var, fmt, args);
  53         va_end(args);
  54
  55         return ret;
  56 }
  57
  58 static int veprintf_time(u64 t, const char *fmt, va_list args)
  59 {
  60         int ret = 0;
  61         u64 secs, usecs, nsecs = t;
  62
  63         secs   = nsecs / NSEC_PER_SEC;
  64         nsecs -= secs  * NSEC_PER_SEC;
  65         usecs  = nsecs / NSEC_PER_USEC;
  66
  67         ret = fprintf(stderr, "[%13" PRIu64 ".%06" PRIu64 "] ",
  68                       secs, usecs);
  69         ret += vfprintf(stderr, fmt, args);
  70         return ret;
  71 }
  72
  73 int eprintf_time(int level, int var, u64 t, const char *fmt, ...)
  74 {
  75         int ret = 0;
  76         va_list args;
  77
  78         if (var >= level) {
  79                 va_start(args, fmt);
  80                 ret = veprintf_time(t, fmt, args);
  81                 va_end(args);
  82         }
  83
  84         return ret;
  85 }
  86
  87 /*
  88  * Overloading libtraceevent standard info print
  89  * function, display with -v in perf.
  90  */
  91 void pr_stat(const char *fmt, ...)
  92 {
  93         va_list args;
  94
  95         va_start(args, fmt);
  96         veprintf(1, verbose, fmt, args);
  97         va_end(args);
  98         eprintf(1, verbose, "\n");
  99 }
 100
 101 int dump_printf(const char *fmt, ...)
 102 {
 103         va_list args;
 104         int ret = 0;
 105
 106         if (dump_trace) {
 107                 va_start(args, fmt);
 108                 ret = vprintf(fmt, args);
 109                 va_end(args);
 110         }
 111
 112         return ret;
 113 }
 114
 115 static int trace_event_printer(enum binary_printer_ops op,
 116                                unsigned int val, void *extra, FILE *fp)
 117 {
 118         const char *color = PERF_COLOR_BLUE;
 119         union perf_event *event = (union perf_event *)extra;
 120         unsigned char ch = (unsigned char)val;
 121         int printed = 0;
 122
 123         switch (op) {
 124         case BINARY_PRINT_DATA_BEGIN:
 125                 printed += fprintf(fp, ".");
 126                 printed += color_fprintf(fp, color, "\n. ... raw event: size %d bytes\n",
 127                                          event->header.size);
 128                 break;
 129         case BINARY_PRINT_LINE_BEGIN:
 130                 printed += fprintf(fp, ".");
 131                 break;
 132         case BINARY_PRINT_ADDR:
 133                 printed += color_fprintf(fp, color, "  %04x: ", val);
 134                 break;
 135         case BINARY_PRINT_NUM_DATA:
 136                 printed += color_fprintf(fp, color, " %02x", val);
 137                 break;
 138         case BINARY_PRINT_NUM_PAD:
 139                 printed += color_fprintf(fp, color, "   ");
 140                 break;
 141         case BINARY_PRINT_SEP:
 142                 printed += color_fprintf(fp, color, "  ");
 143                 break;
 144         case BINARY_PRINT_CHAR_DATA:
 145                 printed += color_fprintf(fp, color, "%c",
 146                               isprint(ch) ? ch : '.');
 147                 break;
 148         case BINARY_PRINT_CHAR_PAD:
 149                 printed += color_fprintf(fp, color, " ");
 150                 break;
 151         case BINARY_PRINT_LINE_END:
 152                 printed += color_fprintf(fp, color, "\n");
 153                 break;
 154         case BINARY_PRINT_DATA_END:
 155                 printed += fprintf(fp, "\n");
 156                 break;
 157         default:
 158                 break;
 159         }
 160
 161         return printed;
 162 }
 163
 164 void trace_event(union perf_event *event)
 165 {
 166         unsigned char *raw_event = (void *)event;
 167
 168         if (!dump_trace)
 169                 return;
 170
 171         print_binary(raw_event, event->header.size, 16,
 172                      trace_event_printer, event);
 173 }
 174
 175 static struct debug_variable {
 176         const char *name;
 177         int *ptr;
 178 } debug_variables[] = {
 179         { .name = "verbose",            .ptr = &verbose },
 180         { .name = "ordered-events",     .ptr = &debug_ordered_events},
 181         { .name = "stderr",             .ptr = &redirect_to_stderr},
 182         { .name = "data-convert",       .ptr = &debug_data_convert },
 183         { .name = NULL, }
 184 };
 185
 186 int perf_debug_option(const char *str)
 187 {
 188         struct debug_variable *var = &debug_variables[0];
 189         char *vstr, *s = strdup(str);
 190         int v = 1;
 191
 192         vstr = strchr(s, '=');
 193         if (vstr)
 194                 *vstr++ = 0;
 195
 196         while (var->name) {
 197                 if (!strcmp(s, var->name))
 198                         break;
 199                 var++;
 200         }
 201
 202         if (!var->name) {
 203                 pr_err("Unknown debug variable name '%s'\n", s);
 204                 free(s);
 205                 return -1;
 206         }
 207
 208         if (vstr) {
 209                 v = atoi(vstr);
 210                 /*
 211                  * Allow only values in range (0, 10),
 212                  * otherwise set 0.
 213                  */
 214                 v = (v < 0) || (v > 10) ? 0 : v;
 215         }
 216
 217         if (quiet)
 218                 v = -1;
 219
 220         *var->ptr = v;
 221         free(s);
 222         return 0;
 223 }
 224
 225 int perf_quiet_option(void)
 226 {
 227         struct debug_variable *var = &debug_variables[0];
 228
 229         /* disable all debug messages */
 230         while (var->name) {
 231                 *var->ptr = -1;
 232                 var++;
 233         }
 234
 235         return 0;
 236 }
 237
 238 #define DEBUG_WRAPPER(__n, __l)                         \
 239 static int pr_ ## __n ## _wrapper(const char *fmt, ...) \
 240 {                                                       \
 241         va_list args;                                   \
 242         int ret;                                        \
 243                                                         \
 244         va_start(args, fmt);                            \
 245         ret = veprintf(__l, verbose, fmt, args);        \
 246         va_end(args);                                   \
 247         return ret;                                     \
 248 }
 249
 250 DEBUG_WRAPPER(warning, 0);
 251 DEBUG_WRAPPER(debug, 1);
 252
 253 void perf_debug_setup(void)
 254 {
 255         libapi_set_print(pr_warning_wrapper, pr_warning_wrapper, pr_debug_wrapper);
 256 }
 257
 258 /* Obtain a backtrace and print it to stdout. */
 259 #ifdef HAVE_BACKTRACE_SUPPORT
 260 void dump_stack(void)
 261 {
 262         void *array[16];
 263         size_t size = backtrace(array, ARRAY_SIZE(array));
 264         char **strings = backtrace_symbols(array, size);
 265         size_t i;
 266
 267         printf("Obtained %zd stack frames.\n", size);
 268
 269         for (i = 0; i < size; i++)
 270                 printf("%s\n", strings[i]);
 271
 272         free(strings);
 273 }
 274 #else
 275 void dump_stack(void) {}
 276 #endif
 277
 278 void sighandler_dump_stack(int sig)
 279 {
 280         psignal(sig, "perf");
 281         dump_stack();
 282         signal(sig, SIG_DFL);
 283         raise(sig);
 284 }