mirror/gcc
2
0
Fork 0
mirror of git://gcc.gnu.org/git/gcc.git synced 2025-04-16 13:01:21 +08:00
Code Issues Packages Projects Releases Wiki Activity

PR tree-optimization/89662 - -Warray-bounds ICE on void* arithmetic

Browse Source 
gcc/ChangeLog:

	PR tree-optimization/89662
	* tree-vrp.c (vrp_prop::check_mem_ref): Avoid assuming every type
	has a size.

gcc/testsuite/ChangeLog:

	PR tree-optimization/89662
	* gcc.dg/Warray-bounds-41.c: New test.

From-SVN: r269655
This commit is contained in:
Martin Sebor 2019-03-13 17:19:43 +00:00 committed by Martin Sebor
parent bd8ea48313
commit 129ef157d4
4 changed files with 51 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2019-03-13 Martin Sebor <msebor@redhat.com>
PR tree-optimization/89662
* tree-vrp.c (vrp_prop::check_mem_ref): Avoid assuming every type
has a size.
2019-03-13 Richard Biener <rguenther@suse.de>
PR middle-end/89677

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2019-03-13 Martin Sebor <msebor@redhat.com>
PR tree-optimization/89662
* gcc.dg/Warray-bounds-41.c: New test.
2019-03-13 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/63508

33
gcc/testsuite/gcc.dg/Warray-bounds-41.c Normal file
View File

@ -0,0 +1,33 @@
/* PR tree-optimization/89662- -Warray-bounds ICE on void* arithmetic
{ dg-do compile }
{ dg-options "-O2 -Wall" } */
void* vptr (void *c)
{
return c;
}
void sink (void*);
void test_vptr_arith_vla_cst (void)
{
int n = 1;
char c[n];
sink (vptr (c) - 1); /* { dg-warning "\\\[-Warray-bounds" } */
}
void test_vptr_arith_vla_range (int n)
{
if (n < 1 || 4 < n)
return;
char c[n];
sink (vptr (c) - 1); /* { dg-warning "\\\[-Warray-bounds" "pr82608" { xfail *-*-* } } */
}
void test_vptr_arith_vla_var (int n)
{
char c[n];
sink (vptr (c) - 1); /* { dg-warning "\\\[-Warray-bounds" "pr82608" { xfail *-*-* } } */
}

11
gcc/tree-vrp.c
View File

@ -4718,13 +4718,16 @@ vrp_prop::check_mem_ref (location_t location, tree ref,
{
/* Extract the element type out of MEM_REF and use its size
to compute the index to print in the diagnostic; arrays
in MEM_REF don't mean anything. */
in MEM_REF don't mean anything. A type with no size like
void is as good as having a size of 1. */
tree type = TREE_TYPE (ref);
while (TREE_CODE (type) == ARRAY_TYPE)
type = TREE_TYPE (type);
tree size = TYPE_SIZE_UNIT (type);
offrange[0] = offrange[0] / wi::to_offset (size);
offrange[1] = offrange[1] / wi::to_offset (size);
if (tree size = TYPE_SIZE_UNIT (type))
{
offrange[0] = offrange[0] / wi::to_offset (size);
offrange[1] = offrange[1] / wi::to_offset (size);
}
}
else
{