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PR tree-optimization/89644 - false-positive -Warray-bounds on strncpy with unterminated array

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gcc/ChangeLog:
	* tree-ssa-strlen.c (handle_builtin_stxncpy): Use full_string_p
	rather than endptr as an indicator of nul-termination.

From-SVN: r269809
This commit is contained in:
Martin Sebor 2019-03-19 18:35:42 +00:00 • committed by Martin Sebor
parent e3ba46bd52
commit e074803086
2 changed files with 6 additions and 2 deletions
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gcc/ChangeLog
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@ -1,5 +1,9 @@
2019-03-19 Martin Sebor <msebor@redhat.com>
PR tree-optimization/89644
* tree-ssa-strlen.c (handle_builtin_stxncpy): Use full_string_p
rather than endptr as an indicator of nul-termination.
PR tree-optimization/89644
* tree-ssa-strlen.c (handle_builtin_stxncpy): Consider unterminated
arrays in determining sequence sizes in strncpy and stpncpy.

4
gcc/tree-ssa-strlen.c
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@ -2210,7 +2210,7 @@ handle_builtin_stxncpy (built_in_function, gimple_stmt_iterator *gsi)
if it is known to be nul-terminated. */
if (sidst->nonzero_chars)
{
if (sidst->endptr)
if (sidst->full_string_p)
{
/* String is known to be nul-terminated. */
tree type = TREE_TYPE (sidst->nonzero_chars);
@ -2236,7 +2236,7 @@ handle_builtin_stxncpy (built_in_function, gimple_stmt_iterator *gsi)
nul if its known to be nul-terminated. */
if (sisrc->nonzero_chars)
{
if (sisrc->endptr)
if (sisrc->full_string_p)
{
tree type = TREE_TYPE (sisrc->nonzero_chars);
srcsize = fold_build2 (PLUS_EXPR, type, sisrc->nonzero_chars,