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PR middle-end/92622 - FAIL: gcc.dg/Warray-bounds-22.c on ILP32: missing warnings for VLA on lines 67 and 69

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gcc/ChangeLog:

	PR middle-end/92622
	* tree-vrp.c (vrp_prop::check_array_ref): Avoid using a variable
	left uninitialized by get_addr_base_and_unit_offset ofn failure.

From-SVN: r279029
This commit is contained in:
Martin Sebor 2019-12-06 00:18:32 +00:00 committed by Martin Sebor
parent b801c7cd79
commit 37cd34543d
2 changed files with 22 additions and 14 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2019-12-05 Martin Sebor <msebor@redhat.com>
PR middle-end/92622
* tree-vrp.c (vrp_prop::check_array_ref): Avoid using a variable
left uninitialized by get_addr_base_and_unit_offset on failure.
2019-12-05 Jan Hubicka <hubicka@ucw.cz>
* ipa-prop.c (ipa_set_jf_unknown): Do not clear bits and m_vr.

8
gcc/tree-vrp.c
View File

@ -3516,7 +3516,6 @@ vrp_prop::check_array_ref (location_t location, tree ref,
tree ptrdiff_max = TYPE_MAX_VALUE (ptrdiff_type_node);
tree maxbound = ptrdiff_max;
tree arg = TREE_OPERAND (ref, 0);
poly_int64 off;
const bool compref = TREE_CODE (arg) == COMPONENT_REF;
if (compref)
@ -3535,8 +3534,10 @@ vrp_prop::check_array_ref (location_t location, tree ref,
size wouldn't necessarily be correct if the reference is
to its flexible array member initialized in a different
translation unit. */
tree base = get_addr_base_and_unit_offset (arg, &off);
if (!compref && base && DECL_P (base))
poly_int64 off;
if (tree base = get_addr_base_and_unit_offset (arg, &off))
{
if (!compref && DECL_P (base))
if (tree basesize = DECL_SIZE_UNIT (base))
if (TREE_CODE (basesize) == INTEGER_CST)
{
@ -3549,6 +3550,7 @@ vrp_prop::check_array_ref (location_t location, tree ref,
wi::sub (wi::to_wide (maxbound),
off));
}
}
else
maxbound = fold_convert (sizetype, maxbound);