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, 12 insertions, 0 deletions

diff --git a/tools/syz-declextract/testdata/include/fs.h b/tools/syz-declextract/testdata/include/fs.h
new file mode 100644
index 000000000..a5c838595
--- /dev/null
+++ b/tools/syz-declextract/testdata/include/fs.h
@@ -0,0 +1,12 @@
+// 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.
+
+struct file_operations {
+	void (*open)(void);
+	void (*read)(void);
+	void (*write)(void);
+	void (*read_iter)(void);
+	void (*write_iter)(void);
+	void (*unlocked_ioctl)(unsigned int);
+	void (*mmap)(void);
+};