linux-kernel - [PATCH 09/15] gendwarfksyms: Expand array

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Message-ID: <20240617175818.58219-26-samitolvanen@google.com>
Date: Mon, 17 Jun 2024 17:58:28 +0000
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Masahiro Yamada <masahiroy@...nel.org>, Luis Chamberlain <mcgrof@...nel.org>, 
	Miguel Ojeda <ojeda@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Matthew Maurer <mmaurer@...gle.com>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Gary Guo <gary@...yguo.net>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH 09/15] gendwarfksyms: Expand array_type

Add support for expanding DW_TAG_array_type, and the subrange type
indicating array size.

Example output with --debug:

  variable array_type [34] {
    pointer_type <unnamed> {
      const_type <unnamed> {
        base_type char byte_size(1)
      }
    }
  };

Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
 tools/gendwarfksyms/types.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/tools/gendwarfksyms/types.c b/tools/gendwarfksyms/types.c
index a56aeaa4f3a1..b1b82d166eb8 100644
--- a/tools/gendwarfksyms/types.c
+++ b/tools/gendwarfksyms/types.c
@@ -177,6 +177,7 @@ DEFINE_PROCESS_UDATA_ATTRIBUTE(byte_size)
 	}
 
 DEFINE_MATCH(formal_parameter)
+DEFINE_MATCH(subrange)
 
 bool match_all(Dwarf_Die *die)
 {
@@ -268,6 +269,31 @@ DEFINE_PROCESS_TYPE(shared)
 DEFINE_PROCESS_TYPE(volatile)
 DEFINE_PROCESS_TYPE(typedef)
 
+static int process_subrange_type(struct state *state, struct cached_die *cache,
+				 Dwarf_Die *die)
+{
+	Dwarf_Word count = 0;
+
+	if (get_udata_attr(die, DW_AT_count, &count))
+		return check(process_fmt(state, cache, "[%" PRIu64 "]", count));
+
+	return check(process(state, cache, "[]"));
+}
+
+static int process_array_type(struct state *state, struct cached_die *cache,
+			      Dwarf_Die *die)
+{
+	check(process(state, cache, "array_type "));
+	/* Array size */
+	check(process_die_container(state, cache, die, process_type,
+				    match_subrange_type));
+	check(process(state, cache, " {"));
+	check(process_linebreak(cache, 1));
+	check(process_type_attr(state, cache, die));
+	check(process_linebreak(cache, -1));
+	return check(process(state, cache, "}"));
+}
+
 static int __process_subroutine_type(struct state *state,
 				     struct cached_die *cache, Dwarf_Die *die,
 				     const char *type)
@@ -378,7 +404,9 @@ static int process_type(struct state *state, struct cached_die *parent,
 	PROCESS_TYPE(volatile)
 	/* Subtypes */
 	PROCESS_TYPE(formal_parameter)
+	PROCESS_TYPE(subrange)
 	/* Other types */
+	PROCESS_TYPE(array)
 	PROCESS_TYPE(base)
 	PROCESS_TYPE(subroutine)
 	PROCESS_TYPE(typedef)
-- 
2.45.2.627.g7a2c4fd464-goog