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https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk
Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [testsuite/] [gcc.c-torture/] [execute/] [pr17377.c] - Rev 378
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/* PR target/17377 Bug in code emitted by "return" pattern on CRIS: missing pop of forced return address on stack. */ int calls = 0; void *f (int) __attribute__ ((__noinline__)); void * f (int i) { /* The code does a little brittle song and dance to trig the "return" pattern instead of the function epilogue. This must still be a leaf function for the bug to be exposed. */ if (calls++ == 0) return __builtin_return_address (0); switch (i) { case 1: return f; case 0: return __builtin_return_address (0); } return 0; } int x; void *y (int i) __attribute__ ((__noinline__,__noclone__)); void * y (int i) { x = 0; /* This must not be a sibling call: the return address must appear constant for different calls to this function. Postincrementing x catches otherwise unidentified multiple returns (e.g. through the return-address register and then this epilogue popping the address stored on stack in "f"). */ return (char *) f (i) + x++; } int main (void) { void *v = y (4); if (y (1) != f /* Can't reasonably check the validity of the return address above, but it's not that important: the test-case will probably crash on the first call to f with the bug present, or it will run wild including returning early (in y or here), so we also try and check the number of calls. */ || y (0) != v || y (3) != 0 || y (-1) != 0 || calls != 5) abort (); exit (0); }
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