e1f4adc93b
2005-06-15 Frank Ch. Eigler <fche@redhat.com> Fix for uncaching bug reported by Herman ten Brugge. * mf-runtime.c (__mf_uncache_object): Search whole cache. * testsuite/libmudflap.c/fail40-frag.c: New test. From-SVN: r100985
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* Test proper lookup-uncaching of large objects */
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#include "../config.h"
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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int main ()
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{
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#ifndef MAP_ANONYMOUS
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#define MAP_ANONYMOUS MAP_ANON
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#endif
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#ifdef HAVE_MMAP
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volatile unsigned char *p;
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unsigned num = getpagesize ();
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unsigned i;
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int rc;
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/* Get a bit of usable address space. We really want an 2**N+1-sized object,
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so the low/high addresses wrap when hashed into the lookup cache. So we
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will manually unregister the entire mmap, then re-register a slice. */
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p = mmap (NULL, num, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
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if (p == NULL)
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return 1;
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/* Now unregister it, as if munmap was called. But don't actually munmap, so
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we can write into the memory. */
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__mf_unregister ((void *) p, num, __MF_TYPE_HEAP_I);
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/* Now register it under a slightly inflated, 2**N+1 size. */
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__mf_register ((void *) p, num+1, __MF_TYPE_HEAP_I, "fake mmap registration");
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/* Traverse array to ensure that entire lookup cache is made to point at it. */
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for (i=0; i<num; i++)
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p[i] = 0;
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/* Unregister it. This should clear the entire lookup cache, even though
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hash(low) == hash (high) (and probably == 0) */
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__mf_unregister ((void *) p, num+1, __MF_TYPE_HEAP_I);
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/* Now touch the middle portion of the ex-array. If the lookup cache was
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well and truly cleaned, then this access should trap. */
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p[num/2] = 1;
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return 0;
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#else
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return 1;
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#endif
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}
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/* { dg-output "mudflap violation 1.*check/write.*" } */
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/* { dg-output "Nearby object 1.*" } */
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/* { dg-output "mudflap dead object.*fake mmap registration.*" } */
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/* { dg-do run { xfail *-*-* } } */
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