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84 lines
1.3 KiB
C
84 lines
1.3 KiB
C
#define UNW_LOCAL_ONLY
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#include <libunwind.h>
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#include "compiler.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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int ok;
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int verbose;
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#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 3)
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void a (int, ...) __attribute__((optimize(0)));
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void b (void) __attribute__((optimize(0)));
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void c (void) __attribute__((optimize(0)));
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#endif
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void NOINLINE
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b (void)
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{
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void *v[20];
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int i, n;
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n = unw_backtrace(v, 20);
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/* Check that the number of addresses given by unw_backtrace() looks
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* reasonable. If the compiler inlined everything, then this check will also
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* break. */
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if (n >= 7)
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ok = 1;
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if (verbose)
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for (i = 0; i < n; ++i)
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printf ("[%d] %p\n", i, v[i]);
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}
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void NOINLINE
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c (void)
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{
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b ();
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}
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void NOINLINE
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a (int d, ...)
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{
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switch (d)
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{
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case 5:
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a (4, 2,4);
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break;
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case 4:
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a (3, 1,3,5);
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break;
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case 3:
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a (2, 11, 13, 17, 23);
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break;
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case 2:
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a (1);
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break;
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case 1:
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c ();
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}
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}
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int
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main (int argc, char **argv UNUSED)
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{
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if (argc > 1)
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verbose = 1;
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a (5, 3, 4, 5, 6);
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if (!ok)
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{
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fprintf (stderr, "FAILURE: expected deeper backtrace.\n");
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return 1;
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}
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if (verbose)
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printf ("SUCCESS.\n");
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return 0;
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}
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