tools/syz-declextract: extract file_operations descriptions

Extend the clang tool to locate file_operations variables and arrays
and dump open/read/write/mmap/ioctl callbacks for each.
It also tries to extract set of ioctl commands and argument types
for them in a simple best-effort way (for now). It just locates switch
in the ioctl callback and extracts each case as a command.

1 files changed, 14 insertions, 0 deletions

diff --git a/tools/syz-declextract/testdata/include/uapi/file_operations.h b/tools/syz-declextract/testdata/include/uapi/file_operations.h
new file mode 100644
index 000000000..6a2a8d259
--- /dev/null
+++ b/tools/syz-declextract/testdata/include/uapi/file_operations.h
@@ -0,0 +1,14 @@
+// Copyright 2024 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+#include "ioctl.h"
+
+#define FOO_IOCTL1		_IO('c', 1)
+#define FOO_IOCTL2		_IOR('c', 2, int)
+#define FOO_IOCTL3		_IOR('c', 3, struct foo_ioctl_arg)
+#define FOO_IOCTL4		_IOW('c', 4, struct foo_ioctl_arg)
+#define FOO_IOCTL5		_IOWR('c', 5, struct foo_ioctl_arg)
+
+struct foo_ioctl_arg {
+	int a, b;
+};