[PATCH 1/2] coroutine: annotate coroutine_fn for libclang

[Paolo Bonzini <pbonzini@redhat.com>]

From: Alberto Faria <afaria@redhat.com>

Clang has a generic __annotate__ attribute that can be used by
static analyzers to understand properties of functions and
analyze the control flow.  Furthermore, unlike TSA annotations, the
__annotate__ attribute applies to function pointers as well.

As a first step towards static analysis of coroutine_fn markers,
attach the attribute to the marker when compiling with clang.

Signed-off-by: Alberto Faria <afaria@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 include/qemu/coroutine.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/qemu/coroutine.h b/include/qemu/coroutine.h
index 89650a2d7fab..b0c97f6fb7ad 100644
--- a/include/qemu/coroutine.h
+++ b/include/qemu/coroutine.h
@@ -42,7 +42,11 @@
  *       ....
  *   }
  */
+#ifdef __clang__
+#define coroutine_fn __attribute__((__annotate__("coroutine_fn")))
+#else
 #define coroutine_fn
+#endif
 
 typedef struct Coroutine Coroutine;
 
-- 
2.38.1