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comparison gcc/testsuite/g++.dg/torture/Wsizeof-pointer-memaccess1.C @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents 04ced10e8804
children
comparison
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111:04ced10e8804 131:84e7813d76e9
1 // Test -Wsizeof-pointer-memaccess warnings. 1 // Test -Wsizeof-pointer-memaccess warnings.
2 // { dg-do compile } 2 // { dg-do compile }
3 // { dg-options "-Wall -Wno-sizeof-array-argument -Wno-stringop-overflow" } 3 // { dg-options "-Wall -Wno-array-bounds -Wno-sizeof-array-argument -Wno-stringop-overflow -Wno-stringop-truncation" }
4 // Test just twice, once with -O0 non-fortified, once with -O2 fortified. 4 // Test just twice, once with -O0 non-fortified, once with -O2 fortified.
5 // { dg-skip-if "" { *-*-* } { "*" } { "-O0" "-O2" } } 5 // { dg-skip-if "" { *-*-* } { "*" } { "-O0" "-O2" } }
6 // { dg-skip-if "" { *-*-* } { "-flto" } { "" } } 6 // { dg-skip-if "" { *-*-* } { "-flto" } { "" } }
7 // { dg-require-effective-target alloca }
7 8
8 extern "C" { 9 extern "C" {
9 10
10 typedef __SIZE_TYPE__ size_t; 11 typedef __SIZE_TYPE__ size_t;
11 extern void *memset (void *, int, size_t); 12 extern void *memset (void *, int, size_t);
696 697
697 strncpy (w, s1, sizeof (w)); // { dg-warning "call is the same expression as the destination; did you mean to provide an explicit length" } 698 strncpy (w, s1, sizeof (w)); // { dg-warning "call is the same expression as the destination; did you mean to provide an explicit length" }
698 strncat (w, s2, sizeof (w)); // { dg-warning "call is the same expression as the destination; did you mean to provide an explicit length" } 699 strncat (w, s2, sizeof (w)); // { dg-warning "call is the same expression as the destination; did you mean to provide an explicit length" }
699 stpncpy (w, s1, sizeof (w)); // { dg-warning "call is the same expression as the destination; did you mean to provide an explicit length" } 700 stpncpy (w, s1, sizeof (w)); // { dg-warning "call is the same expression as the destination; did you mean to provide an explicit length" }
700 701
701 // These are correct, no warning.
702 const char s3[] = "foobarbaz"; 702 const char s3[] = "foobarbaz";
703 const char s4[] = "abcde12345678"; 703 const char s4[] = "abcde12345678";
704 strncpy (x, s3, sizeof (s3)); 704
705 strncat (x, s4, sizeof (s4)); 705 // These are pointless when the destination is large enough, and
706 stpncpy (x, s3, sizeof (s3)); 706 // cause overflow otherwise. They might as well be replaced by
707 // strcpy() or memcpy().
708 strncpy (x, s3, sizeof (s3)); // { dg-warning "call is the same expression as the source; did you mean to use the size of the destination?" }
709 strncat (x, s4, sizeof (s4)); // { dg-warning "call is the same expression as the source; did you mean to use the size of the destination?" }
710 stpncpy (x, s3, sizeof (s3)); // { dg-warning "call is the same expression as the source; did you mean to use the size of the destination?" }
711
712 // These are safe, no warning.
707 y[1] = strndup (s3, sizeof (s3)); 713 y[1] = strndup (s3, sizeof (s3));
708 z += strncmp (s3, s4, sizeof (s3)); 714 z += strncmp (s3, s4, sizeof (s3));
709 z += strncmp (s3, s4, sizeof (s4)); 715 z += strncmp (s3, s4, sizeof (s4));
710 z += strncasecmp (s3, s4, sizeof (s3)); 716 z += strncasecmp (s3, s4, sizeof (s3));
711 z += strncasecmp (s3, s4, sizeof (s4)); 717 z += strncasecmp (s3, s4, sizeof (s4));