runtime/objc-errors.mm

   1 /*
   2  * Copyright (c) 1999-2003, 2005-2007 Apple Inc.  All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  *      objc-errors.m
  25  *      Copyright 1988-2001, NeXT Software, Inc., Apple Computer, Inc.
  26  */
  27
  28 #include "objc-private.h"
  29
  30 #if TARGET_OS_WIN32
  31
  32 #include <conio.h>
  33
  34 void _objc_inform_on_crash(const char *fmt, ...)
  35 {
  36 }
  37
  38 void _objc_inform(const char *fmt, ...)
  39 {
  40     va_list args;
  41     va_start(args, fmt);
  42     _vcprintf(fmt, args);
  43     va_end(args);
  44     _cprintf("\n");
  45 }
  46
  47 void _objc_fatal(const char *fmt, ...)
  48 {
  49     va_list args;
  50     va_start(args, fmt);
  51     _vcprintf(fmt, args);
  52     va_end(args);
  53     _cprintf("\n");
  54
  55     abort();
  56 }
  57
  58 void __objc_error(id rcv, const char *fmt, ...)
  59 {
  60     va_list args;
  61     va_start(args, fmt);
  62     _vcprintf(fmt, args);
  63     va_end(args);
  64
  65     abort();
  66 }
  67
  68 void _objc_error(id rcv, const char *fmt, va_list args)
  69 {
  70     _vcprintf(fmt, args);
  71
  72     abort();
  73 }
  74
  75 #else
  76
  77 #include <_simple.h>
  78
  79 // Return true if c is a UTF8 continuation byte
  80 static bool isUTF8Continuation(char c)
  81 {
  82     return (c & 0xc0) == 0x80;  // continuation byte is 0b10xxxxxx
  83 }
  84
  85 // Add "message" to any forthcoming crash log.
  86 mutex_t crashlog_lock;
  87 static void _objc_crashlog(const char *message)
  88 {
  89     char *newmsg;
  90
  91 #if 0
  92     {
  93         // for debugging at BOOT time.
  94         extern char **_NSGetProgname(void);
  95         FILE *crashlog = fopen("/_objc_crash.log", "a");
  96         setbuf(crashlog, NULL);
  97         fprintf(crashlog, "[%s] %s\n", *_NSGetProgname(), message);
  98         fclose(crashlog);
  99         sync();
 100     }
 101 #endif
 102
 103     mutex_locker_t lock(crashlog_lock);
 104
 105     char *oldmsg = (char *)CRGetCrashLogMessage();
 106     size_t oldlen;
 107     const size_t limit = 8000;
 108
 109     if (!oldmsg) {
 110         newmsg = strdup(message);
 111     } else if ((oldlen = strlen(oldmsg)) > limit) {
 112         // limit total length by dropping old contents
 113         char *truncmsg = oldmsg + oldlen - limit;
 114         // advance past partial UTF-8 bytes
 115         while (isUTF8Continuation(*truncmsg)) truncmsg++;
 116         asprintf(&newmsg, "... %s\n%s", truncmsg, message);
 117     } else {
 118         asprintf(&newmsg, "%s\n%s", oldmsg, message);
 119     }
 120
 121     if (newmsg) {
 122         // Strip trailing newline
 123         char *c = &newmsg[strlen(newmsg)-1];
 124         if (*c == '\n') *c = '\0';
 125
 126         if (oldmsg) free(oldmsg);
 127         CRSetCrashLogMessage(newmsg);
 128     }
 129 }
 130
 131 // Returns true if logs should be sent to stderr as well as syslog.
 132 // Copied from CFUtilities.c
 133 static bool also_do_stderr(void)
 134 {
 135     struct stat st;
 136     int ret = fstat(STDERR_FILENO, &st);
 137     if (ret < 0) return false;
 138     mode_t m = st.st_mode & S_IFMT;
 139     if (m == S_IFREG  ||  m == S_IFSOCK  ||  m == S_IFIFO  ||  m == S_IFCHR) {
 140         return true;
 141     }
 142     return false;
 143 }
 144
 145 // Print "message" to the console.
 146 static void _objc_syslog(const char *message)
 147 {
 148     _simple_asl_log(ASL_LEVEL_ERR, nil, message);
 149
 150     if (also_do_stderr()) {
 151         write(STDERR_FILENO, message, strlen(message));
 152     }
 153 }
 154
 155 /*
 156  * _objc_error is the default *_error handler.
 157  */
 158 #if !__OBJC2__
 159 // used by ExceptionHandling.framework
 160 #endif
 161 __attribute__((noreturn, cold))
 162 void _objc_error(id self, const char *fmt, va_list ap)
 163 {
 164     char *buf;
 165     vasprintf(&buf, fmt, ap);
 166     _objc_fatal("%s: %s", object_getClassName(self), buf);
 167 }
 168
 169 /*
 170  * this routine handles errors that involve an object (or class).
 171  */
 172 void __objc_error(id rcv, const char *fmt, ...)
 173 {
 174     va_list vp;
 175
 176     va_start(vp,fmt);
 177 #if !__OBJC2__
 178     (*_error)(rcv, fmt, vp);
 179 #endif
 180     _objc_error (rcv, fmt, vp);  /* In case (*_error)() returns. */
 181     va_end(vp);
 182 }
 183
 184 static __attribute__((noreturn, cold))
 185 void _objc_fatalv(uint64_t reason, uint64_t flags, const char *fmt, va_list ap)
 186 {
 187     char *buf1;
 188     vasprintf(&buf1, fmt, ap);
 189
 190     char *buf2;
 191     asprintf(&buf2, "objc[%d]: %s\n", getpid(), buf1);
 192     _objc_syslog(buf2);
 193
 194     if (DebugDontCrash) {
 195         char *buf3;
 196         asprintf(&buf3, "objc[%d]: HALTED\n", getpid());
 197         _objc_syslog(buf3);
 198         _Exit(1);
 199     }
 200     else {
 201         _objc_crashlog(buf1);
 202         abort_with_reason(OS_REASON_OBJC, reason, buf1, flags);
 203     }
 204 }
 205
 206 void _objc_fatal_with_reason(uint64_t reason, uint64_t flags,
 207                              const char *fmt, ...)
 208 {
 209     va_list ap;
 210     va_start(ap, fmt);
 211     _objc_fatalv(reason, flags, fmt, ap);
 212 }
 213
 214 void _objc_fatal(const char *fmt, ...)
 215 {
 216     va_list ap;
 217     va_start(ap,fmt);
 218     _objc_fatalv(OBJC_EXIT_REASON_UNSPECIFIED,
 219                  OS_REASON_FLAG_ONE_TIME_FAILURE,
 220                  fmt, ap);
 221 }
 222
 223 /*
 224  * this routine handles soft runtime errors...like not being able
 225  * add a category to a class (because it wasn't linked in).
 226  */
 227 void _objc_inform(const char *fmt, ...)
 228 {
 229     va_list ap;
 230     char *buf1;
 231     char *buf2;
 232
 233     va_start (ap,fmt);
 234     vasprintf(&buf1, fmt, ap);
 235     va_end (ap);
 236
 237     asprintf(&buf2, "objc[%d]: %s\n", getpid(), buf1);
 238     _objc_syslog(buf2);
 239
 240     free(buf2);
 241     free(buf1);
 242 }
 243
 244
 245 /*
 246  * Like _objc_inform(), but prints the message only in any
 247  * forthcoming crash log, not to the console.
 248  */
 249 void _objc_inform_on_crash(const char *fmt, ...)
 250 {
 251     va_list ap;
 252     char *buf1;
 253     char *buf2;
 254
 255     va_start (ap,fmt);
 256     vasprintf(&buf1, fmt, ap);
 257     va_end (ap);
 258
 259     asprintf(&buf2, "objc[%d]: %s\n", getpid(), buf1);
 260     _objc_crashlog(buf2);
 261
 262     free(buf2);
 263     free(buf1);
 264 }
 265
 266
 267 /*
 268  * Like calling both _objc_inform and _objc_inform_on_crash.
 269  */
 270 void _objc_inform_now_and_on_crash(const char *fmt, ...)
 271 {
 272     va_list ap;
 273     char *buf1;
 274     char *buf2;
 275
 276     va_start (ap,fmt);
 277     vasprintf(&buf1, fmt, ap);
 278     va_end (ap);
 279
 280     asprintf(&buf2, "objc[%d]: %s\n", getpid(), buf1);
 281     _objc_crashlog(buf2);
 282     _objc_syslog(buf2);
 283
 284     free(buf2);
 285     free(buf1);
 286 }
 287
 288 #endif
 289
 290
 291 BREAKPOINT_FUNCTION(
 292     void _objc_warn_deprecated(void)
 293 );
 294
 295 void _objc_inform_deprecated(const char *oldf, const char *newf)
 296 {
 297     if (PrintDeprecation) {
 298         if (newf) {
 299             _objc_inform("The function %s is obsolete. Use %s instead. Set a breakpoint on _objc_warn_deprecated to find the culprit.", oldf, newf);
 300         } else {
 301             _objc_inform("The function %s is obsolete. Do not use it. Set a breakpoint on _objc_warn_deprecated to find the culprit.", oldf);
 302         }
 303     }
 304     _objc_warn_deprecated();
 305 }