[PATCH dwarves 1/6] dwarf_loader: introduce pre/post cus__load_module hooks to conf_load

[Ihor Solodrai <ihor.solodrai@xxxxx>]

Preparation for making btf_encoder.functions table shared between
encoders.

Shared table can be built as soon as Elf struct is extracted from
Dwfl_Module, which happens in cus__proces_dwflmod.

Signed-off-by: Ihor Solodrai <ihor.solodrai@xxxxx>
---
 dwarf_loader.c | 21 ++++++++++++++-------
 dwarves.h      | 18 ++++++++++++++++--
 2 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/dwarf_loader.c b/dwarf_loader.c
index e54a16c..fb42eb5 100644
--- a/dwarf_loader.c
+++ b/dwarf_loader.c
@@ -3723,13 +3723,6 @@ static int cus__load_module(struct cus *cus, struct conf_load *conf,
 	return DWARF_CB_OK;
 }
 
-struct process_dwflmod_parms {
-	struct cus	 *cus;
-	struct conf_load *conf;
-	const char	 *filename;
-	uint32_t	 nr_dwarf_sections_found;
-};
-
 static int cus__process_dwflmod(Dwfl_Module *dwflmod,
 				void **userdata __maybe_unused,
 				const char *name __maybe_unused,
@@ -3753,10 +3746,24 @@ static int cus__process_dwflmod(Dwfl_Module *dwflmod,
 	Dwarf *dw = dwfl_module_getdwarf(dwflmod, &dwbias);
 
 	int err = DWARF_CB_OK;
+	if (parms->conf->pre_cus__load_module) {
+		err = parms->conf->pre_cus__load_module(parms, dwflmod, dw, elf);
+		if (err)
+			return DWARF_CB_ABORT;
+	}
+
 	if (dw != NULL) {
 		++parms->nr_dwarf_sections_found;
 		err = cus__load_module(cus, parms->conf, dwflmod, dw, elf,
 				       parms->filename);
+		if (err)
+			return err;
+	}
+
+	if (parms->conf->post_cus__load_module) {
+		err = parms->conf->post_cus__load_module(parms, dwflmod, dw, elf);
+		if (err)
+			return DWARF_CB_ABORT;
 	}
 	/*
 	 * XXX We will fall back to try finding other debugging
diff --git a/dwarves.h b/dwarves.h
index f58e1d0..1b16f0c 100644
--- a/dwarves.h
+++ b/dwarves.h
@@ -36,6 +36,7 @@
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
 
 struct cu;
+struct cus;
 
 enum load_steal_kind {
 	LSK__KEEPIT,
@@ -58,6 +59,13 @@ typedef uint32_t type_id_t;
 struct btf;
 struct conf_fprintf;
 
+struct process_dwflmod_parms {
+	struct cus	 *cus;
+	struct conf_load *conf;
+	const char	 *filename;
+	uint32_t	 nr_dwarf_sections_found;
+};
+
 /** struct conf_load - load configuration
  * @thread_exit - called at the end of a thread, 1st user: BTF encoder dedup
  * @extra_dbg_info - keep original debugging format extra info
@@ -105,6 +113,14 @@ struct conf_load {
 	struct conf_fprintf	*conf_fprintf;
 	int			(*threads_prepare)(struct conf_load *conf, int nr_threads, void **thr_data);
 	int			(*threads_collect)(struct conf_load *conf, int nr_threads, void **thr_data, int error);
+	int			(*pre_cus__load_module)(struct process_dwflmod_parms *parms,
+							Dwfl_Module *mod,
+							Dwarf *dw,
+							Elf *elf);
+	int			(*post_cus__load_module)(struct process_dwflmod_parms *parms,
+							 Dwfl_Module *mod,
+							 Dwarf *dw,
+							 Elf *elf);
 };
 
 /** struct conf_fprintf - hints to the __fprintf routines
@@ -166,8 +182,6 @@ struct conf_fprintf {
 	uint8_t    skip_emitting_modifier:1;
 };
 
-struct cus;
-
 struct cus *cus__new(void);
 void cus__delete(struct cus *cus);
 
-- 
2.34.1