[PATCH dwarves 3/5] btf_encoder: child encoders should have a reference to parent encoder

[Alan Maguire <alan.maguire@oracle.com>]

The parent encoder will be used to share details of local functions
such that we can mark those which have optimized parameters in
any CU.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
---
 btf_encoder.c | 4 +++-
 btf_encoder.h | 2 +-
 pahole.c      | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/btf_encoder.c b/btf_encoder.c
index 15a042c..449439f 100644
--- a/btf_encoder.c
+++ b/btf_encoder.c
@@ -49,6 +49,7 @@ struct var_info {
  */
 struct btf_encoder {
 	struct list_head  node;
+	struct btf_encoder *parent;
 	struct btf        *btf;
 	struct cu         *cu;
 	struct gobuffer   percpu_secinfo;
@@ -1433,11 +1434,12 @@ out:
 	return err;
 }
 
-struct btf_encoder *btf_encoder__new(struct cu *cu, const char *detached_filename, struct btf *base_btf, bool skip_encoding_vars, bool force, bool gen_floats, bool verbose)
+struct btf_encoder *btf_encoder__new(struct cu *cu, const char *detached_filename, struct btf *base_btf, bool skip_encoding_vars, bool force, bool gen_floats, struct btf_encoder *parent, bool verbose)
 {
 	struct btf_encoder *encoder = zalloc(sizeof(*encoder));
 
 	if (encoder) {
+		encoder->parent = parent;
 		encoder->raw_output = detached_filename != NULL;
 		encoder->filename = strdup(encoder->raw_output ? detached_filename : cu->filename);
 		if (encoder->filename == NULL)
diff --git a/btf_encoder.h b/btf_encoder.h
index a65120c..fd5a97f 100644
--- a/btf_encoder.h
+++ b/btf_encoder.h
@@ -16,7 +16,7 @@ struct btf;
 struct cu;
 struct list_head;
 
-struct btf_encoder *btf_encoder__new(struct cu *cu, const char *detached_filename, struct btf *base_btf, bool skip_encoding_vars, bool force, bool gen_floats, bool verbose);
+struct btf_encoder *btf_encoder__new(struct cu *cu, const char *detached_filename, struct btf *base_btf, bool skip_encoding_vars, bool force, bool gen_floats, struct btf_encoder *parent, bool verbose);
 void btf_encoder__delete(struct btf_encoder *encoder);
 
 int btf_encoder__encode(struct btf_encoder *encoder);
diff --git a/pahole.c b/pahole.c
index 6f4f87c..844d502 100644
--- a/pahole.c
+++ b/pahole.c
@@ -3037,7 +3037,7 @@ static enum load_steal_kind pahole_stealer(struct cu *cu,
 			 * create it.
 			 */
 			btf_encoder = btf_encoder__new(cu, detached_btf_filename, conf_load->base_btf, skip_encoding_btf_vars,
-						       btf_encode_force, btf_gen_floats, global_verbose);
+						       btf_encode_force, btf_gen_floats, NULL, global_verbose);
 			if (btf_encoder && thr_data) {
 				struct thread_data *thread = thr_data;
 
@@ -3069,6 +3069,7 @@ static enum load_steal_kind pahole_stealer(struct cu *cu,
 							 skip_encoding_btf_vars,
 							 btf_encode_force,
 							 btf_gen_floats,
+							 btf_encoder,
 							 global_verbose);
 				thread->btf = btf_encoder__btf(thread->encoder);
 			}
-- 
1.8.3.1