Crash in iOS simulator iOS 8 when rotating screen left

no-reply@allegro.cc (jmasterx) — Thu, 05 Feb 2015 11:03:22 +0000

I have just built allegro and its dependencies targeting iOS 7 and 8.

I built real device and simulator binaries. I just created a simple test program to test things out.

It is basically ex_physfs

#SelectExpand
   1/*
*    Example program for Allegro library.
*
*    Demonstrate PhysicsFS addon.
*/
   6
   7
   8#include 
   9#include 
  10#include 
  11#include 
  12#include 
  13
  14#include "common.c"
  15
  16static void show_image(ALLEGRO_BITMAP *bmp)
  17{
  ALLEGRO_EVENT_QUEUE *queue;
  ALLEGRO_EVENT event;
  
  queue = al_create_event_queue();
  al_register_event_source(queue, al_get_keyboard_event_source());
  
  while (true) {
      al_draw_bitmap(bmp, 0, 0, 0);
      al_flip_display();
      al_wait_for_event(queue, &event);
      if (event.type == ALLEGRO_EVENT_KEY_DOWN
          && event.keyboard.keycode == ALLEGRO_KEY_ESCAPE) {
          break;
      }
  }
  
  al_destroy_event_queue(queue);
  35}
  36
  37static void print_file(ALLEGRO_FS_ENTRY *entry)
  38{
  int mode = al_get_fs_entry_mode(entry);
  time_t now = time(NULL);
  time_t atime = al_get_fs_entry_atime(entry);
  time_t ctime = al_get_fs_entry_ctime(entry);
  time_t mtime = al_get_fs_entry_mtime(entry);
  const char *name = al_get_fs_entry_name(entry);
  off_t size = al_get_fs_entry_size(entry);
  
  log_printf("%-36s %s%s%s%s%s%s %8u %8u %8u %8u\n",
             name,
             mode & ALLEGRO_FILEMODE_READ ? "r" : ".",
             mode & ALLEGRO_FILEMODE_WRITE ? "w" : ".",
             mode & ALLEGRO_FILEMODE_EXECUTE ? "x" : ".",
             mode & ALLEGRO_FILEMODE_HIDDEN ? "h" : ".",
             mode & ALLEGRO_FILEMODE_ISFILE ? "f" : ".",
             mode & ALLEGRO_FILEMODE_ISDIR ? "d" : ".",
             (unsigned)(now - ctime),
             (unsigned)(now - mtime),
             (unsigned)(now - atime),
             (unsigned)size);
  59}
  60
  61static void listdir(ALLEGRO_FS_ENTRY *entry)
  62{
  ALLEGRO_FS_ENTRY *next;
  
  al_open_directory(entry);
  while (1) {
      next = al_read_directory(entry);
      if (!next)
      break;
      
      print_file(next);
      if (al_get_fs_entry_mode(next) & ALLEGRO_FILEMODE_ISDIR)
      listdir(next);
      al_destroy_fs_entry(next);
  }
  al_close_directory(entry);
  77}
  78
  79static bool add_main_zipfile(void)
  80{
  ALLEGRO_PATH *exe;
  const char *ext;
  const char *zipfile;
  bool ret;
  
  /* On Android we treat the APK itself as the zip file. */
  exe = al_get_standard_path(ALLEGRO_EXENAME_PATH);
  ext = al_get_path_extension(exe);
  if (0 == strcmp(ext, ".apk")) {
      zipfile = al_path_cstr(exe, '/');
  }
  else {
      zipfile = "ex_physfs.zip";
  }
  
  if (PHYSFS_addToSearchPath(zipfile, 1)) {
      ret = true;
  }
  else {
      log_printf("Could load the zip file: %s\n", zipfile);
      ret = false;
  }
  
  al_destroy_path(exe);
  
  return ret;
 107}
 108
 109int main(int argc, char *argv[])
 110{
  ALLEGRO_DISPLAY *display;
  ALLEGRO_BITMAP *bmp;
  ALLEGRO_FS_ENTRY *entry;
  int i;
  
  if (!al_init()) {
      abort_example("Could not init Allegro\n");
  }
  al_init_image_addon();
  al_install_keyboard();
  open_log_monospace();
  
  /* Set up PhysicsFS. */
  if (!PHYSFS_init(argv[0])) {
      abort_example("Could not init PhysFS\n");
  }
  // This creates a ~/.allegro directory, which is very annoying to say the
  // least - and no need for it in this example.
  //  if (!PHYSFS_setSaneConfig("allegro", "ex_physfs", NULL, 0, 0))
  //     return 1;
  if (!add_main_zipfile()) {
      abort_example("Could not add zip file\n");
  }
  
  for (i = 1; i < argc; i++) {
      if (!PHYSFS_addToSearchPath(argv[i], 1)) {
          abort_example("Couldn't add %s\n", argv[i]);
      }
  }
  
  display = al_create_display(640, 480);
  if (!display) {
      abort_example("Error creating display.\n");
  }
  
  /* Make future calls to al_fopen() on this thread go to the PhysicsFS
   * backend.
   */
  al_set_physfs_file_interface();
  
  /* List the contents of our example zip recursively. */
  log_printf("%-36s %-6s %8s %8s %8s %8s\n",
             "name", "flags", "ctime", "mtime", "atime", "size");
  log_printf(
             "------------------------------------ "
             "------ "
             "-------- "
             "-------- "
             "-------- "
             "--------\n");
  entry = al_create_fs_entry("");
  listdir(entry);
  al_destroy_fs_entry(entry);
  
  bmp = al_load_bitmap("02.bmp");
  if (!bmp) {
      /* Fallback for Android. */
      bmp = al_load_bitmap("assets/data/alexlogo.bmp");
  }
  if (bmp) {
      show_image(bmp);
      al_destroy_bitmap(bmp);
  }
  
  PHYSFS_deinit();
  
  //close_log(false);
  return 0;
 179}
 180
 181
 182/* vim: set sts=3 sw=3 et: */

When using the iOS 7 simulators, everything is working great. When I use any of the iOS 8 simulators, almost everything works, except when I rotate the screen left, I immediately get an ex_bad_access from EAGLView.m on line 192.

- (BOOL)createFramebuffer {
   ALLEGRO_DISPLAY_IPHONE *d = (ALLEGRO_DISPLAY_IPHONE *)allegro_display;

    if (d->extra->adapter == 0 && [self respondsToSelector:@selector(contentScaleFactor)]) {
        scale = self.contentScaleFactor = [[UIScreen mainScreen] scale];
        ALLEGRO_INFO("Screen scale is %f\n", self.contentScaleFactor);
    }
    else {
      scale = 1.0f;
    }

The cause of the crash is that the allegro display pointer is NULL. I do not know why. I would be tempted to do:

- (BOOL)createFramebuffer {
   ALLEGRO_DISPLAY_IPHONE *d = (ALLEGRO_DISPLAY_IPHONE *)allegro_display;

    if(d == NULL)
     return;

    if (d->extra->adapter == 0 && [self respondsToSelector:@selector(contentScaleFactor)]) {
        scale = self.contentScaleFactor = [[UIScreen mainScreen] scale];
        ALLEGRO_INFO("Screen scale is %f\n", self.contentScaleFactor);
    }

But that seems evil.

In any case I wanted to bring this to the attention of the devs. I'm using Xcode 6.1 and OSX 10.9.4.

I will soon be posting my binaries so that everyone with Xcode 6 can quickly try this for themselves. My binaries have a debug version with debug symbols.

no-reply@allegro.cc (SiegeLord) — Sat, 07 Feb 2015 11:30:23 +0000

Do you have a backtrace?

no-reply@allegro.cc (jmasterx) — Sat, 07 Feb 2015 13:27:17 +0000

If you mean a stack trace then I can get that to you, if not, please describe what you mean.

no-reply@allegro.cc (SiegeLord) — Sat, 07 Feb 2015 14:06:42 +0000

Two terms for the same thing .

no-reply@allegro.cc (jmasterx) — Sat, 07 Feb 2015 20:59:40 +0000

I can't seem to find a way to print a stack trace, but I'll just print it myself:

#0 0x000a4280 in -[EAGLView createFramebuffer] at /Users/josh/Downloads/allegro5-5.1/src/iphone/EAGLView.m:192

EAGLView.m -> line 192
locals:

self  EAGLView *  0x7b681130  0x7b681130
_cmd  SEL  "createFramebuffer"  0x001e5c38
d  ALLEGRO_DISPLAY_IPHONE *  NULL  0x00000000
depth_stencil_format  GLint

Contents of self at this point:

self  EAGLView *  0x7b681130  0x7b681130
UIView  UIView    
context  EAGLContext *  nil  0x00000000
allegro_display  ALLEGRO_DISPLAY *  NULL  0x00000000
viewRenderbuffer  GLuint  0  0
viewFramebuffer  GLuint  0  0
depthRenderbuffer  GLuint  0  0
touch_list  _AL_LIST *  0x7b681990  0x7b681990
touch_id_set  NSMutableIndexSet *  0 indexes  0x7b6819f0
primary_touch  UITouch *  nil  0x00000000
next_free_touch_id  int  1  1
scale  float  0  0
backingWidth  GLint  0  0
backingHeight  GLint  0  0

#1 0x000a40c9 in -[EAGLView layoutSubviews] at /Users/josh/Downloads/allegro5-5.1/src/iphone/EAGLView.m:161

EAGLView.m -> line 161
locals:

self  EAGLView *  0x7b681130  0x7b681130
_cmd  SEL  "layoutSubviews"  0x01d1c520

Contents of self at this point:

self  EAGLView *  0x7b681130  0x7b681130
UIView  UIView    
context  EAGLContext *  nil  0x00000000
allegro_display  ALLEGRO_DISPLAY *  NULL  0x00000000
viewRenderbuffer  GLuint  0  0
viewFramebuffer  GLuint  0  0
depthRenderbuffer  GLuint  0  0
touch_list  _AL_LIST *  0x7b681990  0x7b681990
touch_id_set  NSMutableIndexSet *  0 indexes  0x7b6819f0
primary_touch  UITouch *  nil  0x00000000
next_free_touch_id  int  1  1
scale  float  0  0
backingWidth  GLint  0  0
backingHeight  GLint  0  0

Then:
#2 0x014a4dd1 in -[UIView(CALayerDelegate) layoutSublayersOfLayer:] ()
#44 0x014198b6 in UIApplicationMain ()
#45 0x00118a83 in +[allegroAppDelegate run::] at /Users/josh/Downloads/allegro5-5.1/src/iphone/allegroAppDelegate.m:391
Then:
iphone_main.m line 63
#46 0x00067716 in main at /Users/josh/Downloads/allegro5-5.1/src/iphone/iphone_main.m:63

Here is where Thread 7 (al_mangled_main thread is):
#0 0x02a147ca in __psynch_cvwait ()
#2 0x02a56bd9 in pthread_cond_wait$UNIX2003 ()
#3 0x00158d7a in _al_cond_wait at /Users/josh/Downloads/allegro5-5.1/misc/Allegro 5 iOS/../../include/allegro5/platform/aintuthr.h:81
#4 0x00158cf4 in al_wait_for_event at /Users/josh/Downloads/allegro5-5.1/src/events.c:392
#5 0x000189d9 in _al_mangled_main at /Users/josh/Desktop/Allegro 5.1.9 iOS/AllegroIOSTest/AllegroIOSTest/main.mm:440
#6 0x000675b0 in user_main at /Users/josh/Downloads/allegro5-5.1/src/iphone/iphone_main.m:19
#7 0x000744c1 in thread_func_trampoline at /Users/josh/Downloads/allegro5-5.1/src/threads.c:80
#8 0x0007d7a3 in thread_proc_trampoline at /Users/josh/Downloads/allegro5-5.1/src/unix/uxthread.c:44
#9 0x02a525fb in _pthread_body ()
#10 0x02a52485 in _pthread_start ()
#11 0x02a57cf2 in thread_start ()

---
I thought it only happened when I turn the device left, but as long as I have set the orientation as supported, it will cause this on iOS 8.1.

no-reply@allegro.cc (Thomas Fjellstrom) — Sat, 07 Feb 2015 22:32:36 +0000

jmasterx said:

I can't seem to find a way to print a stack trace, but I'll just print it myself:

I think you can set up a trigger in XCode's debugger that fires on any exception/crash. then it should give you a backtrace on crash. Though i think it'd let you get a backtrace even if you don't if you find the debugger window.