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* [Bug tree-optimization/99502] New: missing -Warray-bounds on partial out of bounds access in C++
@ 2021-03-10 0:58 msebor at gcc dot gnu.org
2021-03-10 0:58 ` [Bug tree-optimization/99502] " msebor at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-03-10 0:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99502
Bug ID: 99502
Summary: missing -Warray-bounds on partial out of bounds access
in C++
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
The program below triggers two instances of -Warray-bounds when compiled as C
code but only one when compiled as C++. This is a regression introduced in
r11-7563.
$ cat u.C && gcc -O2 -S -Wall u.C
typedef struct A { int i; } A;
char a[sizeof (A) - 1];
void f (A x)
{
A *p = (A*)a;
*p = x; // -Warray-bounds (good)
}
void g (void)
{
A *p = (A*)a;
p->i = 0; // missing warning in C++
}
u.C: In function ‘void f(A)’:
u.C:8:6: warning: array subscript ‘A[0]’ is partly outside array bounds of
‘char [3]’ [-Warray-bounds]
8 | *p = x; // -Warray-bounds (good)
| ~~~^~~
u.C:3:6: note: while referencing ‘a’
3 | char a[sizeof (A) - 1];
| ^
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/99502] missing -Warray-bounds on partial out of bounds access in C++
2021-03-10 0:58 [Bug tree-optimization/99502] New: missing -Warray-bounds on partial out of bounds access in C++ msebor at gcc dot gnu.org
@ 2021-03-10 0:58 ` msebor at gcc dot gnu.org
2021-03-18 19:38 ` cvs-commit at gcc dot gnu.org
2021-03-18 19:39 ` msebor at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-03-10 0:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99502
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2021-03-10
Keywords| |diagnostic
Ever confirmed|0 |1
Status|UNCONFIRMED |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/99502] missing -Warray-bounds on partial out of bounds access in C++
2021-03-10 0:58 [Bug tree-optimization/99502] New: missing -Warray-bounds on partial out of bounds access in C++ msebor at gcc dot gnu.org
2021-03-10 0:58 ` [Bug tree-optimization/99502] " msebor at gcc dot gnu.org
@ 2021-03-18 19:38 ` cvs-commit at gcc dot gnu.org
2021-03-18 19:39 ` msebor at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-03-18 19:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99502
--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Sebor <msebor@gcc.gnu.org>:
https://gcc.gnu.org/g:30b10dacd0a8c926c22eab7d4aeb52ff86534acf
commit r11-7724-g30b10dacd0a8c926c22eab7d4aeb52ff86534acf
Author: Martin Sebor <msebor@redhat.com>
Date: Thu Mar 18 13:36:09 2021 -0600
PR middle-end/99502 - missing -Warray-bounds on partial out of bounds
gcc/ChangeLog:
PR middle-end/99502
* gimple-array-bounds.cc (inbounds_vbase_memaccess_p): Rename...
(inbounds_memaccess_p): ...to this. Check the ending offset of
the accessed member.
gcc/testsuite/ChangeLog:
PR middle-end/99502
* g++.dg/warn/Warray-bounds-22.C: New test.
* g++.dg/warn/Warray-bounds-23.C: New test.
* g++.dg/warn/Warray-bounds-24.C: New test.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/99502] missing -Warray-bounds on partial out of bounds access in C++
2021-03-10 0:58 [Bug tree-optimization/99502] New: missing -Warray-bounds on partial out of bounds access in C++ msebor at gcc dot gnu.org
2021-03-10 0:58 ` [Bug tree-optimization/99502] " msebor at gcc dot gnu.org
2021-03-18 19:38 ` cvs-commit at gcc dot gnu.org
@ 2021-03-18 19:39 ` msebor at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-03-18 19:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99502
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Target Milestone|--- |11.0
Resolution|--- |FIXED
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Fixed in r11-7724.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-03-10 0:58 [Bug tree-optimization/99502] New: missing -Warray-bounds on partial out of bounds access in C++ msebor at gcc dot gnu.org
2021-03-10 0:58 ` [Bug tree-optimization/99502] " msebor at gcc dot gnu.org
2021-03-18 19:38 ` cvs-commit at gcc dot gnu.org
2021-03-18 19:39 ` msebor at gcc dot gnu.org
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