120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/* PR middle-end/95667 - unintended warning for memset writing across multiple
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members
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{ dg-do compile }
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{ dg-options "-O2 -Wall" }
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{ dg-require-effective-target alloca } */
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extern void sink (void*);
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struct S1 { char a[3], b[5]; };
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void warn_strcpy_s1 (void)
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{
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struct S1 *p = __builtin_malloc (sizeof *p);
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char s[] = "1234567";
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__builtin_strcpy (p->a, s); // { dg-warning "\\\[-Wstringop-overflow" }
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sink (p);
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}
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void nowarn_memset_s1 (void)
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{
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struct S1 *p = __builtin_malloc (sizeof *p);
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__builtin_memset (p->a, 0, 8); // { dg-bogus "\\\[-Wstringop-overflow" }
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sink (p);
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}
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struct S2 { char a[2], b[2][2], c[3]; };
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void nowarn_memset_s2 (void)
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{
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struct S2 *p = __builtin_malloc (sizeof *p);
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__builtin_memset (p->a, 0, sizeof *p);
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sink (p);
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__builtin_memset (p->b, 0, 7);
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sink (p);
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__builtin_memset (&p->b[0], 0, 7);
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sink (p);
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__builtin_memset (&p->b[1], 0, 5);
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sink (p);
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__builtin_memset (&p->b[0][0], 0, 7);
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sink (p);
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__builtin_memset (&p->b[0][1], 0, 6);
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sink (p);
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__builtin_memset (&p->b[1][0], 0, 5);
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sink (p);
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__builtin_memset (&p->b[1][1], 0, 4);
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sink (p);
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}
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void warn_memset_s2 (void)
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{
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const unsigned n = sizeof (struct S2);
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struct S2 *p = __builtin_malloc (n);
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/* These should trigger -Wstringop-overflow rather than -Warray-bounds
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but the main purpose of the test is to verify the absence of warnings
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above so the exact warning for these overflwing calls isn't important
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here. */
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__builtin_memset (p->a, 0, n + 1); // { dg-warning "\\\[-Warray-bounds|-Wstringop-overflow" }
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sink (p);
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__builtin_memset (p->b, 0, 8); // { dg-warning "\\\[-Warray-bounds|-Wstringop-overflow" }
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sink (p);
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__builtin_memset (&p->b[0], 0, 8); // { dg-warning "\\\[-Warray-bounds|-Wstringop-overflow" }
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sink (p);
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__builtin_memset (&p->b[0][0], 0, 8); // { dg-warning "\\\[-Warray-bounds|-Wstringop-overflow" }
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sink (p);
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__builtin_memset (&p->b[1], 0, 6); // { dg-warning "\\\[-Warray-bounds|-Wstringop-overflow" }
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sink (p);
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__builtin_memset (&p->b[0][1], 0, 7); // { dg-warning "\\\[-Warray-bounds|-Wstringop-overflow" }
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sink (p);
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}
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void nowarn_vl_struct (unsigned n)
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{
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if (n < 3 || 5 < n)
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n = 3;
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struct V { char a[3], b[n], c[7]; } v;
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__builtin_memset (v.a, 0, 15);
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sink (&v);
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__builtin_memset (v.b, 0, 12);
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sink (&v);
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__builtin_memset (v.c, 0, 7);
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sink (&v);
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__builtin_memset (v.a, 0, 16); // { dg-warning "\\\[-Warray-bounds|-Wstringop-overflow" }
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sink (&v);
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__builtin_memset (v.b, 0, 13); // { dg-warning "\\\[-Warray-bounds|-Wstringop-overflow" }
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sink (&v);
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/* The &V.C argument is represented as a variable offset from
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the beginning of the allocated object and there's no good
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way to figure out from its variable offset that it's base
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is the C member:
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s.1_12 = __builtin_alloca_with_align (prephitmp_24, 8);
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_9 = s.1_12 + prephitmp_27;
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__builtin_memset (_9, 0, 2);
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*/
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__builtin_memset (v.c, 0, 8); // { dg-warning "\\\[-Warray-bounds|-Wstringop-overflow" "pr?????" { xfail *-*-* } }
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sink (&v);
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}
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