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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [testsuite/] [gcc.c-torture/] [execute/] [pr17377.c] - Blame information for rev 688

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Line No. Rev Author Line
1 688 jeremybenn
/* PR target/17377
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   Bug in code emitted by "return" pattern on CRIS: missing pop of
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   forced return address on stack.  */
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int calls = 0;
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void *f (int) __attribute__ ((__noinline__));
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void *
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f (int i)
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{
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  /* The code does a little brittle song and dance to trig the "return"
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     pattern instead of the function epilogue.  This must still be a
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     leaf function for the bug to be exposed.  */
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  if (calls++ == 0)
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    return __builtin_return_address (0);
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  switch (i)
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    {
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    case 1:
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      return f;
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    case 0:
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      return __builtin_return_address (0);
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    }
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  return 0;
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}
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int x;
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void *y (int i) __attribute__ ((__noinline__,__noclone__));
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void *
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y (int i)
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{
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  x = 0;
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  /* This must not be a sibling call: the return address must appear
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     constant for different calls to this function.  Postincrementing x
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     catches otherwise unidentified multiple returns (e.g. through the
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     return-address register and then this epilogue popping the address
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     stored on stack in "f").  */
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  return (char *) f (i) + x++;
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}
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int
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main (void)
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{
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  void *v = y (4);
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  if (y (1) != f
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      /* Can't reasonably check the validity of the return address
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         above, but it's not that important: the test-case will probably
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         crash on the first call to f with the bug present, or it will
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         run wild including returning early (in y or here), so we also
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         try and check the number of calls.  */
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      || y (0) != v
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      || y (3) != 0
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      || y (-1) != 0
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      || calls != 5)
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    abort ();
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  exit (0);
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}

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