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Message-ID: <20240923181846.549877-30-samitolvanen@google.com>
Date: Mon, 23 Sep 2024 18:18:54 +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>, Petr Pavlu <petr.pavlu@...e.com>,
Neal Gompa <neal@...pa.dev>, Hector Martin <marcan@...can.st>, Janne Grunau <j@...nau.net>,
Miroslav Benes <mbenes@...e.cz>, Asahi Linux <asahi@...ts.linux.dev>, 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 v3 08/20] gendwarfksyms: Expand subroutine_type
Add support for expanding DW_TAG_subroutine_type and the parameters
in DW_TAG_formal_parameter. Use this to also expand subprograms.
Example output with --dump-dies:
subprogram (
formal_parameter pointer_type {
const_type {
base_type char byte_size(1) encoding(6)
}
}
)
-> base_type unsigned long byte_size(8) encoding(7)
Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
scripts/gendwarfksyms/dwarf.c | 84 ++++++++++++++++++++++++++-
scripts/gendwarfksyms/gendwarfksyms.h | 4 ++
2 files changed, 85 insertions(+), 3 deletions(-)
diff --git a/scripts/gendwarfksyms/dwarf.c b/scripts/gendwarfksyms/dwarf.c
index 50ef58591c83..5bdab5b80ca2 100644
--- a/scripts/gendwarfksyms/dwarf.c
+++ b/scripts/gendwarfksyms/dwarf.c
@@ -209,6 +209,15 @@ DEFINE_PROCESS_UDATA_ATTRIBUTE(alignment)
DEFINE_PROCESS_UDATA_ATTRIBUTE(byte_size)
DEFINE_PROCESS_UDATA_ATTRIBUTE(encoding)
+/* Match functions -- die_match_callback_t */
+#define DEFINE_MATCH(type) \
+ static bool match_##type##_type(Dwarf_Die *die) \
+ { \
+ return dwarf_tag(die) == DW_TAG_##type##_type; \
+ }
+
+DEFINE_MATCH(formal_parameter)
+
bool match_all(Dwarf_Die *die)
{
return true;
@@ -221,19 +230,28 @@ int process_die_container(struct state *state, struct die *cache,
Dwarf_Die current;
int res;
+ /* Track the first item in lists. */
+ if (state)
+ state->first_list_item = true;
+
res = checkp(dwarf_child(die, ¤t));
while (!res) {
if (match(¤t)) {
/* <0 = error, 0 = continue, >0 = stop */
res = checkp(func(state, cache, ¤t));
if (res)
- return res;
+ goto out;
}
res = checkp(dwarf_siblingof(¤t, ¤t));
}
- return 0;
+ res = 0;
+out:
+ if (state)
+ state->first_list_item = false;
+
+ return res;
}
static int process_type(struct state *state, struct die *parent,
@@ -253,6 +271,40 @@ static void process_type_attr(struct state *state, struct die *cache,
process(cache, "base_type void");
}
+static void process_list_comma(struct state *state, struct die *cache)
+{
+ if (state->first_list_item) {
+ state->first_list_item = false;
+ } else {
+ process(cache, " ,");
+ process_linebreak(cache, 0);
+ }
+}
+
+/* Comma-separated with DW_AT_type */
+static void __process_list_type(struct state *state, struct die *cache,
+ Dwarf_Die *die, const char *type)
+{
+ const char *name = get_name_attr(die);
+
+ process_list_comma(state, cache);
+ process(cache, type);
+ process_type_attr(state, cache, die);
+ if (name) {
+ process(cache, " ");
+ process(cache, name);
+ }
+}
+
+#define DEFINE_PROCESS_LIST_TYPE(type) \
+ static void process_##type##_type(struct state *state, \
+ struct die *cache, Dwarf_Die *die) \
+ { \
+ __process_list_type(state, cache, die, #type " "); \
+ }
+
+DEFINE_PROCESS_LIST_TYPE(formal_parameter)
+
/* Container types with DW_AT_type */
static void __process_type(struct state *state, struct die *cache,
Dwarf_Die *die, const char *type)
@@ -287,6 +339,29 @@ DEFINE_PROCESS_TYPE(shared)
DEFINE_PROCESS_TYPE(volatile)
DEFINE_PROCESS_TYPE(typedef)
+static void __process_subroutine_type(struct state *state, struct die *cache,
+ Dwarf_Die *die, const char *type)
+{
+ process(cache, type);
+ process(cache, " (");
+ process_linebreak(cache, 1);
+ /* Parameters */
+ check(process_die_container(state, cache, die, process_type,
+ match_formal_parameter_type));
+ process_linebreak(cache, -1);
+ process(cache, ")");
+ process_linebreak(cache, 0);
+ /* Return type */
+ process(cache, "-> ");
+ process_type_attr(state, cache, die);
+}
+
+static void process_subroutine_type(struct state *state, struct die *cache,
+ Dwarf_Die *die)
+{
+ __process_subroutine_type(state, cache, die, "subroutine_type");
+}
+
static void process_base_type(struct state *state, struct die *cache,
Dwarf_Die *die)
{
@@ -357,8 +432,11 @@ static int process_type(struct state *state, struct die *parent, Dwarf_Die *die)
PROCESS_TYPE(rvalue_reference)
PROCESS_TYPE(shared)
PROCESS_TYPE(volatile)
+ /* Subtypes */
+ PROCESS_TYPE(formal_parameter)
/* Other types */
PROCESS_TYPE(base)
+ PROCESS_TYPE(subroutine)
PROCESS_TYPE(typedef)
default:
debug("unimplemented type: %x", tag);
@@ -388,7 +466,7 @@ static void process_symbol(struct state *state, Dwarf_Die *die,
static int __process_subprogram(struct state *state, struct die *cache,
Dwarf_Die *die)
{
- process(cache, "subprogram");
+ __process_subroutine_type(state, cache, die, "subprogram");
return 0;
}
diff --git a/scripts/gendwarfksyms/gendwarfksyms.h b/scripts/gendwarfksyms/gendwarfksyms.h
index 81b8989efa22..d5186472f705 100644
--- a/scripts/gendwarfksyms/gendwarfksyms.h
+++ b/scripts/gendwarfksyms/gendwarfksyms.h
@@ -63,6 +63,7 @@ extern int dump_dies;
#define checkp(expr) __check(expr, __res < 0)
/* Consistent aliases (DW_TAG_<type>_type) for DWARF tags */
+#define DW_TAG_formal_parameter_type DW_TAG_formal_parameter
#define DW_TAG_typedef_type DW_TAG_typedef
/*
@@ -155,6 +156,9 @@ void die_map_free(void);
struct state {
struct symbol *sym;
Dwarf_Die die;
+
+ /* List expansion */
+ bool first_list_item;
};
typedef int (*die_callback_t)(struct state *state, struct die *cache,
--
2.46.0.792.g87dc391469-goog
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