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gbacktrace: on macOS support and default to LLDB

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Tweaked by Philip Withnall <withnall@endlessm.com> to fix review issues.

Closes: #1004
This commit is contained in:
Kristian Rietveld 2015-03-06 22:40:40 +01:00 committed by Philip Withnall
parent 9dc006cfc8
commit 1fbd185430
1 changed files with 49 additions and 7 deletions
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56
glib/gbacktrace.c
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@ -72,6 +72,17 @@
static void stack_trace (const char * const *args);
#endif
/* Default to using LLDB for backtraces on macOS. */
#ifdef __APPLE__
#define USE_LLDB
#endif
#ifdef USE_LLDB
#define DEBUGGER "lldb"
#else
#define DEBUGGER "gdb"
#endif
/* People want to hit this from their debugger... */
GLIB_AVAILABLE_IN_ALL volatile gboolean glib_on_error_halt;
volatile gboolean glib_on_error_halt = TRUE;
@ -231,7 +242,7 @@ g_on_error_stack_trace (const gchar *prg_name)
#if defined(G_OS_UNIX)
pid_t pid;
gchar buf[16];
const gchar *args[4] = { "gdb", NULL, NULL, NULL };
const gchar *args[5] = { DEBUGGER, NULL, NULL, NULL, NULL };
int status;
if (!prg_name)
@ -239,8 +250,14 @@ g_on_error_stack_trace (const gchar *prg_name)
_g_sprintf (buf, "%u", (guint) getpid ());
#ifdef USE_LLDB
args[1] = prg_name;
args[2] = "-p";
args[3] = buf;
#else
args[1] = prg_name;
args[2] = buf;
#endif
pid = fork ();
if (pid == 0)
@ -250,11 +267,19 @@ g_on_error_stack_trace (const gchar *prg_name)
}
else if (pid == (pid_t) -1)
{
perror ("unable to fork gdb");
perror ("unable to fork " DEBUGGER);
return;
}
waitpid (pid, &status, 0);
/* Wait until the child really terminates. On Mac OS X waitpid ()
* will also return when the child is being stopped due to tracing.
*/
while (1)
{
pid_t retval = waitpid (pid, &status, 0);
if (WIFEXITED (retval) || WIFSIGNALED (retval))
break;
}
#else
if (IsDebuggerPresent ())
G_BREAKPOINT ();
@ -273,6 +298,8 @@ stack_trace_sigchld (int signum)
stack_trace_done = TRUE;
}
#define BUFSIZE 1024
static void
stack_trace (const char * const *args)
{
@ -282,8 +309,8 @@ stack_trace (const char * const *args)
fd_set fdset;
fd_set readset;
struct timeval tv;
int sel, idx, state;
char buffer[256];
int sel, idx, state, line_idx;
char buffer[BUFSIZE];
char c;
stack_trace_done = FALSE;
@ -315,7 +342,7 @@ stack_trace (const char * const *args)
close (2);
dup (old_err);
}
perror ("exec gdb failed");
perror ("exec " DEBUGGER " failed");
_exit (0);
}
else if (pid == (pid_t) -1)
@ -327,11 +354,19 @@ stack_trace (const char * const *args)
FD_ZERO (&fdset);
FD_SET (out_fd[0], &fdset);
#ifdef USE_LLDB
write (in_fd[1], "bt\n", 3);
write (in_fd[1], "p x = 0\n", 8);
write (in_fd[1], "process detach\n", 15);
write (in_fd[1], "quit\n", 5);
#else
write (in_fd[1], "backtrace\n", 10);
write (in_fd[1], "p x = 0\n", 8);
write (in_fd[1], "quit\n", 5);
#endif
idx = 0;
line_idx = 0;
state = 0;
while (1)
@ -348,10 +383,15 @@ stack_trace (const char * const *args)
{
if (read (out_fd[0], &c, 1))
{
line_idx += 1;
switch (state)
{
case 0:
#ifdef USE_LLDB
if (c == '*' || (c == ' ' && line_idx == 1))
#else
if (c == '#')
#endif
{
state = 1;
idx = 0;
@ -359,13 +399,15 @@ stack_trace (const char * const *args)
}
break;
case 1:
buffer[idx++] = c;
if (idx < BUFSIZE)
buffer[idx++] = c;
if ((c == '\n') || (c == '\r'))
{
buffer[idx] = 0;
_g_fprintf (stdout, "%s", buffer);
state = 0;
idx = 0;
line_idx = 0;
}
break;
default: