PR tree-optimization/81384 - built-in form of strnlen missing

gcc/ChangeLog:

	PR tree-optimization/81384
	* builtin-types.def (BT_FN_SIZE_CONST_STRING_SIZE): New.
	* builtins.c (expand_builtin_strnlen): New function.
	(expand_builtin): Call it.
	(fold_builtin_n): Avoid setting TREE_NO_WARNING.
	* builtins.def (BUILT_IN_STRNLEN): New.
	* calls.c (maybe_warn_nonstring_arg): Handle BUILT_IN_STRNLEN.
	Warn for bounds in excess of maximum object size.
	* tree-ssa-strlen.c (maybe_set_strlen_range): Return tree representing
	single-value ranges.  Handle strnlen.
	(handle_builtin_strlen): Handle strnlen.
	(strlen_check_and_optimize_stmt): Same.
	* doc/extend.texi (Other Builtins): Document strnlen.

gcc/testsuite/ChangeLog:

	PR tree-optimization/81384
	* gcc.c-torture/execute/builtins/lib/strnlen.c: New test.
	* gcc.c-torture/execute/builtins/strnlen-lib.c: New test.
	* gcc.c-torture/execute/builtins/strnlen.c: New test.
	* gcc.dg/attr-nonstring-2.c: New test.
	* gcc.dg/attr-nonstring-3.c: New test.
	* gcc.dg/attr-nonstring-4.c: New test.
	* gcc.dg/strlenopt-45.c: New test.
	* gcc.dg/strlenopt.h (strnlen):  Declare.

From-SVN: r261705

1 files changed, 64 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/attr-nonstring-4.c b/gcc/testsuite/gcc.dg/attr-nonstring-4.c
new file mode 100644
index 0000000..7daff97
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/attr-nonstring-4.c
@@ -0,0 +1,64 @@
+/* PR middle-end/81384 - built-in form of strnlen missing
+
+   Verify that a strnlen bound in excess of the maximum object size
+   is diagnosed regardless of attribute nonstring.  Also verify that
+   a bound that's greater than the size of a non-string array is
+   diagnosed, even if it's not in excess of the maximum object size.
+
+   { dg-do compile }
+   { dg-options "-O2 -Wall -ftrack-macro-expansion=0" } */
+
+#include "range.h"
+
+extern size_t strnlen (const char*, size_t);
+
+#define STR   /* not non-string */
+#define NS    __attribute__ ((nonstring))
+
+#define _CAT(s, n)   s ## n
+#define CAT(s, n)    _CAT (s, n)
+#define UNIQ(n)      CAT (n, __LINE__)
+
+void sink (size_t);
+
+#define T(attr, N, bound)			\
+  do {						\
+    extern attr char UNIQ (a)[N];		\
+    sink (strnlen (UNIQ (a), bound));		\
+  } while (0)
+
+void strnlen_cst (void)
+{
+  size_t n = DIFF_MAX;
+
+  T (STR, /* [] */, n);
+  T (STR, /* [] */, n + 1);    /* { dg-warning "specified bound \[0-9\]+ exceeds maximum object size \[0-9\]+" } */
+
+  T (STR, 1, n);
+  T (STR, 2, n + 1);           /* { dg-warning "specified bound \[0-9\]+ exceeds maximum object size \[0-9\]+" } */
+
+  T (NS, /* [] */, n);
+  T (NS, /* [] */, n + 1);     /* { dg-warning "specified bound \[0-9\]+ exceeds maximum object size \[0-9\]+" } */
+
+  T (NS, 9, n);                /* { dg-warning "argument 1 declared attribute .nonstring. is smaller than the specified bound" } */
+  T (NS, 10, n + 1);           /* { dg-warning "specified bound \[0-9\]+ exceeds maximum object size \[0-9\]+" } */
+}
+
+
+void strnlen_range (void)
+{
+  size_t n = DIFF_MAX;
+  n = UR (n, n + 1);
+
+  T (STR, /* [] */, n);
+  T (STR, /* [] */, n + 1);    /* { dg-warning "specified bound \\\[\[0-9\]+, \[0-9\]+] exceeds maximum object size \[0-9\]+" } */
+
+  T (STR, 1, n);
+  T (STR, 2, n + 1);           /* { dg-warning "specified bound \\\[\[0-9\]+, \[0-9\]+] exceeds maximum object size \[0-9\]+" } */
+
+  T (NS, /* [] */, n);
+  T (NS, /* [] */, n + 1);     /* { dg-warning "specified bound \\\[\[0-9\]+, \[0-9\]+] exceeds maximum object size \[0-9\]+" } */
+
+  T (NS, 9, n);                /* { dg-warning "argument 1 declared attribute .nonstring. is smaller than the specified bound" } */
+  T (NS, 10, n + 1);           /* { dg-warning "specified bound \\\[\[0-9\]+, \[0-9\]+] exceeds maximum object size \[0-9\]+" } */
+}