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* [gcc r11-7658] PR tree-optimization/99489 - ICE calling strncat after strcat
@ 2021-03-13 21:29 Martin Sebor
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From: Martin Sebor @ 2021-03-13 21:29 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:77643ac4bbd0ff758edc182a12cb622b74a3c38a
commit r11-7658-g77643ac4bbd0ff758edc182a12cb622b74a3c38a
Author: Martin Sebor <msebor@redhat.com>
Date: Tue Mar 9 15:02:35 2021 -0700
PR tree-optimization/99489 - ICE calling strncat after strcat
gcc/ChangeLog:
PR tree-optimization/99489
* builtins.c (gimple_call_alloc_size): Fail gracefully when argument
is not a call statement.
gcc/testsuite/ChangeLog:
PR tree-optimization/99489
* gcc.dg/Wstringop-truncation-9.c: New test.
Diff:
---
gcc/builtins.c | 2 +-
gcc/testsuite/gcc.dg/Wstringop-truncation-9.c | 41 +++++++++++++++++++++++++++
2 files changed, 42 insertions(+), 1 deletion(-)
diff --git a/gcc/builtins.c b/gcc/builtins.c
index 41e336c071c..196dda3fa5e 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -4924,7 +4924,7 @@ tree
gimple_call_alloc_size (gimple *stmt, wide_int rng1[2] /* = NULL */,
range_query * /* = NULL */)
{
- if (!stmt)
+ if (!stmt || !is_gimple_call (stmt))
return NULL_TREE;
tree allocfntype;
diff --git a/gcc/testsuite/gcc.dg/Wstringop-truncation-9.c b/gcc/testsuite/gcc.dg/Wstringop-truncation-9.c
new file mode 100644
index 00000000000..63614809da4
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wstringop-truncation-9.c
@@ -0,0 +1,41 @@
+/* PR tree-optimization/99489 - ICE calling strncat after strncat
+ { dg-do compile }
+ { dg-options "-O2 -Wall" } */
+
+// Important -- see pr82429.
+char *stpcpy (char *, const char *);
+
+void fchar (char *d, char c, char *s)
+{
+ __builtin_strcat (d, s);
+ __builtin_strncat (d, &c, 1);
+}
+
+void fcstchar (char *d, char *s)
+{
+ __builtin_strcat (d, s);
+
+ const char c = 'x';
+ __builtin_strncat (d, &c, 1); // { dg-warning "-Wstringop-truncation" }
+}
+
+void fstr (char *d, char *s)
+{
+ __builtin_strcat (d, s);
+ __builtin_strncat (d, s, 1);
+}
+
+void farr (char *d, char *s)
+{
+ __builtin_strcat (d, s);
+
+ char a[] = "x";
+ __builtin_strncat (d, a, 1); // { dg-warning "-Wstringop-truncation" }
+}
+
+void flit (char *d, char *s)
+{
+ __builtin_strcat (d, s);
+ __builtin_strncat (d, "x", 1); // { dg-warning "-Wstringop-truncation" "pr?????" { xfail *-*-*} }
+ // { dg-warning "-Wstringop-overflow" "actual" { target *-*-*} .-1 }
+}
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