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[RFC,2/3] dwarf_loader: Add name to inline expansion

Message ID 20250416-btf_inline-v1-2-e4bd2f8adae5@meta.com (mailing list archive)
State RFC
Headers show
Series list inline expansions in .BTF.inline | expand

Checks

Context Check Description
netdev/tree_selection success Not a local patch

Commit Message

Thierry Treyer April 16, 2025, 7:20 p.m. UTC 
From: Thierry Treyer <ttreyer@meta.com>

Add the name field to inline expansion. It contains the name of the
abstract origin. The name can be used to locate the origin function in
the BTF.

Surely there's a better way to find the btf_id of the original function?

Signed-off-by: Thierry Treyer <ttreyer@meta.com>
---
 dwarf_loader.c | 9 +++++++++
 dwarves.h      | 1 +
 2 files changed, 10 insertions(+)
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Patch

diff --git a/dwarf_loader.c b/dwarf_loader.c
index 24ac9afceb3793c165d3e92cfdfaf27ab67fd4d6..d7a130d138a65bad71a563cf3d629bdd7b9e6c6f 100644
--- a/dwarf_loader.c
+++ b/dwarf_loader.c
@@ -1376,6 +1376,15 @@  static struct inline_expansion *inline_expansion__new(Dwarf_Die *die, struct cu
 		dtag->decl_file = attr_string(die, DW_AT_call_file, conf);
 		dtag->decl_line = attr_numeric(die, DW_AT_call_line);
 		dwarf_tag__set_attr_type(dtag, type, die, DW_AT_abstract_origin);
+
+		Dwarf_Attribute attr_orig;
+		if (dwarf_attr(die, DW_AT_abstract_origin, &attr_orig)) {
+			Dwarf_Die die_orig;
+			if (dwarf_formref_die(&attr_orig, &die_orig)) {
+				exp->name = attr_string(&die_orig, DW_AT_name, conf);
+			}
+		}
+
 		exp->ip.addr = 0;
 		exp->high_pc = 0;
 		exp->nr_parms = 0;
diff --git a/dwarves.h b/dwarves.h
index 38efd6a6e2b0b0e5a571a8d12bbec33502509d8b..13b19433fe4aa7cd54ec0160c7008a33cbc17e24 100644
--- a/dwarves.h
+++ b/dwarves.h
@@ -809,6 +809,7 @@  struct ip_tag {
 
 struct inline_expansion {
 	struct ip_tag	 ip;
+	const char *name;
 	size_t		 size;
 	uint64_t	 high_pc;
 	struct list_head parms;