public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc(refs/users/pheeck/heads/sccp)] analyzer: fix 'errno' on Solaris and OS X [PR107807]
@ 2023-02-15 10:20 Filip Kastl
0 siblings, 0 replies; only message in thread
From: Filip Kastl @ 2023-02-15 10:20 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:c5a6ab8477ac0453817a78589d1456d315497376
commit c5a6ab8477ac0453817a78589d1456d315497376
Author: David Malcolm <dmalcolm@redhat.com>
Date: Tue Nov 22 17:29:21 2022 -0500
analyzer: fix 'errno' on Solaris and OS X [PR107807]
gcc/analyzer/ChangeLog:
PR analyzer/107807
* region-model-impl-calls.cc (register_known_functions): Register
"___errno" and "__error" as synonyms for "__errno_location".
gcc/testsuite/ChangeLog:
PR analyzer/107807
* gcc.dg/analyzer/errno-___errno.c: New test.
* gcc.dg/analyzer/errno-__error.c: New test.
* gcc.dg/analyzer/errno-global-var.c: New test.
Signed-off-by: David Malcolm <dmalcolm@redhat.com>
Diff:
---
gcc/analyzer/region-model-impl-calls.cc | 14 ++++++++++++
gcc/testsuite/gcc.dg/analyzer/errno-___errno.c | 29 ++++++++++++++++++++++++
gcc/testsuite/gcc.dg/analyzer/errno-__error.c | 28 +++++++++++++++++++++++
gcc/testsuite/gcc.dg/analyzer/errno-global-var.c | 26 +++++++++++++++++++++
4 files changed, 97 insertions(+)
diff --git a/gcc/analyzer/region-model-impl-calls.cc b/gcc/analyzer/region-model-impl-calls.cc
index 6962ffd400f..23a21d752cf 100644
--- a/gcc/analyzer/region-model-impl-calls.cc
+++ b/gcc/analyzer/region-model-impl-calls.cc
@@ -1953,6 +1953,20 @@ register_known_functions (known_function_manager &kfm)
kfm.add ("error_at_line", make_unique<kf_error> (5));
}
+ /* Other implementations of C standard library. */
+ {
+ /* According to PR 107807 comment #2, Solaris implements "errno"
+ like this:
+ extern int *___errno(void) __attribute__((__const__));
+ #define errno (*(___errno()))
+ and OS X like this:
+ extern int * __error(void);
+ #define errno (*__error())
+ Add these as synonyms for "__errno_location". */
+ kfm.add ("___errno", make_unique<kf_errno_location> ());
+ kfm.add ("__error", make_unique<kf_errno_location> ());
+ }
+
/* C++ support functions. */
{
kfm.add ("operator new", make_unique<kf_operator_new> ());
diff --git a/gcc/testsuite/gcc.dg/analyzer/errno-___errno.c b/gcc/testsuite/gcc.dg/analyzer/errno-___errno.c
new file mode 100644
index 00000000000..17ff8b7de9d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/analyzer/errno-___errno.c
@@ -0,0 +1,29 @@
+#include "analyzer-decls.h"
+
+/* According to PR 107807 comment #2, Solaris implements "errno"
+ like this: */
+
+extern int *___errno(void) __attribute__((__const__));
+#define errno (*(___errno()))
+
+
+extern void external_fn (void);
+
+int test_reading_errno (void)
+{
+ return errno;
+}
+
+void test_setting_errno (int val)
+{
+ errno = val;
+}
+
+void test_storing_to_errno (int val)
+{
+ __analyzer_eval (errno == val); /* { dg-warning "UNKNOWN" } */
+ errno = val;
+ __analyzer_eval (errno == val); /* { dg-warning "TRUE" } */
+ external_fn ();
+ __analyzer_eval (errno == val); /* { dg-warning "UNKNOWN" } */
+}
diff --git a/gcc/testsuite/gcc.dg/analyzer/errno-__error.c b/gcc/testsuite/gcc.dg/analyzer/errno-__error.c
new file mode 100644
index 00000000000..19bc4f937f6
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/analyzer/errno-__error.c
@@ -0,0 +1,28 @@
+#include "analyzer-decls.h"
+
+/* According to PR 107807 comment #2, OS X implements "errno"
+ like this: */
+
+extern int * __error(void);
+#define errno (*__error())
+
+extern void external_fn (void);
+
+int test_reading_errno (void)
+{
+ return errno;
+}
+
+void test_setting_errno (int val)
+{
+ errno = val;
+}
+
+void test_storing_to_errno (int val)
+{
+ __analyzer_eval (errno == val); /* { dg-warning "UNKNOWN" } */
+ errno = val;
+ __analyzer_eval (errno == val); /* { dg-warning "TRUE" } */
+ external_fn ();
+ __analyzer_eval (errno == val); /* { dg-warning "UNKNOWN" } */
+}
diff --git a/gcc/testsuite/gcc.dg/analyzer/errno-global-var.c b/gcc/testsuite/gcc.dg/analyzer/errno-global-var.c
new file mode 100644
index 00000000000..fdf1b17cecc
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/analyzer/errno-global-var.c
@@ -0,0 +1,26 @@
+#include "analyzer-decls.h"
+
+/* "errno" declared as a global var. */
+
+extern int errno;
+
+extern void external_fn (void);
+
+int test_reading_errno (void)
+{
+ return errno;
+}
+
+void test_setting_errno (int val)
+{
+ errno = val;
+}
+
+void test_storing_to_errno (int val)
+{
+ __analyzer_eval (errno == val); /* { dg-warning "UNKNOWN" } */
+ errno = val;
+ __analyzer_eval (errno == val); /* { dg-warning "TRUE" } */
+ external_fn ();
+ __analyzer_eval (errno == val); /* { dg-warning "UNKNOWN" } */
+}
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2023-02-15 10:20 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-02-15 10:20 [gcc(refs/users/pheeck/heads/sccp)] analyzer: fix 'errno' on Solaris and OS X [PR107807] Filip Kastl
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).