[PATCH v2 2/5] btf: added KIND_FUNC traversal function.

[Cupertino Miranda <cupertino.miranda@oracle.com>]

Added a traversal function to traverse all BTF_KIND_FUNC nodes with a
callback function. Used for .BTF.ext section content creation.

gcc/ChangeLog:

	* btfout.cc (output_btf_func_types): Use FOR_EACH_VEC_ELT.
	(traverse_btf_func_types): Defined function.
	* ctfc.h (funcs_traverse_callback): Typedef for function
	prototype.
	(traverse_btf_func_types): Added prototype.
---
 gcc/btfout.cc | 22 ++++++++++++++++++++--
 gcc/ctfc.h    |  3 +++
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/gcc/btfout.cc b/gcc/btfout.cc
index 7e114e224449..7aabd99f3e7c 100644
--- a/gcc/btfout.cc
+++ b/gcc/btfout.cc
@@ -1276,8 +1276,10 @@ output_btf_types (ctf_container_ref ctfc)
 static void
 output_btf_func_types (ctf_container_ref ctfc)
 {
-  for (size_t i = 0; i < vec_safe_length (funcs); i++)
-    btf_asm_func_type (ctfc, (*funcs)[i], i);
+  ctf_dtdef_ref ref;
+  unsigned i;
+  FOR_EACH_VEC_ELT (*funcs, i, ref)
+    btf_asm_func_type (ctfc, ref, i);
 }
 
 /* Output all BTF_KIND_DATASEC records.  */
@@ -1452,4 +1454,20 @@ btf_finalize (void)
   tu_ctfc = NULL;
 }
 
+/* Traversal function for all BTF_KIND_FUNC type records.  */
+
+bool
+traverse_btf_func_types (funcs_traverse_callback callback, void *data)
+{
+  ctf_dtdef_ref ref;
+  unsigned i;
+  FOR_EACH_VEC_ELT (*funcs, i, ref)
+    {
+      bool stop = callback (ref, data);
+      if (stop == true)
+	return true;
+    }
+  return false;
+}
+
 #include "gt-btfout.h"
diff --git a/gcc/ctfc.h b/gcc/ctfc.h
index 7aac57edac55..fa188bf2f5a4 100644
--- a/gcc/ctfc.h
+++ b/gcc/ctfc.h
@@ -441,6 +441,9 @@ extern int ctf_add_variable (ctf_container_ref, const char *, ctf_id_t,
 extern ctf_id_t ctf_lookup_tree_type (ctf_container_ref, const tree);
 extern ctf_id_t get_btf_id (ctf_id_t);
 
+typedef bool (*funcs_traverse_callback) (ctf_dtdef_ref, void *);
+bool traverse_btf_func_types (funcs_traverse_callback, void *);
+
 /* CTF section does not emit location information; at this time, location
    information is needed for BTF CO-RE use-cases.  */
 
-- 
2.39.2