[PATCH 06/15] gendwarfksyms: Expand type modifiers and typedefs

Sami Tolvanen
2024-06-17T17:58:37Z

Add support for expanding DWARF type modifiers, such as pointers,
const values etc., and typedefs. These types all have DW_AT_type
attribute pointing the underlying type, and thus produce similar
output.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
tools/gendwarfksyms/gendwarfksyms.h | 3 ++
tools/gendwarfksyms/types.c | 54 +++++++++++++++++++++++++++--
2 files changed, 54 insertions(+), 3 deletions(-)

diff --git a/tools/gendwarfksyms/gendwarfksyms.h b/tools/gendwarfksyms/gendwarfksyms.h
index ea5a9fbda66f..d5ebfe405445 100644
--- a/tools/gendwarfksyms/gendwarfksyms.h
+++ b/tools/gendwarfksyms/gendwarfksyms.h
@@ -50,6 +50,9 @@ extern bool no_cache;
__res; \
})

+/* Consistent aliases (DW_TAG_<type>_type) for DWARF tags */
+#define DW_TAG_typedef_type DW_TAG_typedef
+
/*
* symbols.c
*/
diff --git a/tools/gendwarfksyms/types.c b/tools/gendwarfksyms/types.c
index 78046c08be23..27169c77937f 100644
--- a/tools/gendwarfksyms/types.c
+++ b/tools/gendwarfksyms/types.c
@@ -189,6 +189,38 @@ static int process_type_attr(struct state *state, struct cached_die *cache,
return check(process(state, cache, "base_type void"));
}

+/* Container types with DW_AT_type */
+static int __process_type(struct state *state, struct cached_die *cache,
+ Dwarf_Die *die, const char *type)
+{
+ check(process(state, cache, type));
+ check(process_fqn(state, cache, die));
+ check(process(state, cache, " {"));
+ check(process_type_attr(state, cache, die));
+ check(process(state, cache, "}"));
+ check(process_byte_size_attr(state, cache, die));
+ return check(process_alignment_attr(state, cache, die));
+}
+
+#define DEFINE_PROCESS_TYPE(type) \
+ static int process_##type##_type( \
+ struct state *state, struct cached_die *cache, Dwarf_Die *die) \
+ { \
+ return __process_type(state, cache, die, #type "_type "); \
+ }
+
+DEFINE_PROCESS_TYPE(atomic)
+DEFINE_PROCESS_TYPE(const)
+DEFINE_PROCESS_TYPE(immutable)
+DEFINE_PROCESS_TYPE(packed)
+DEFINE_PROCESS_TYPE(pointer)
+DEFINE_PROCESS_TYPE(reference)
+DEFINE_PROCESS_TYPE(restrict)
+DEFINE_PROCESS_TYPE(rvalue_reference)
+DEFINE_PROCESS_TYPE(shared)
+DEFINE_PROCESS_TYPE(volatile)
+DEFINE_PROCESS_TYPE(typedef)
+
static int process_base_type(struct state *state, struct cached_die *cache,
Dwarf_Die *die)
{
@@ -233,6 +265,11 @@ static void state_init(struct state *state)
state->crc = 0xffffffff;
}

+#define PROCESS_TYPE(type) \
+ case DW_TAG_##type##_type: \
+ check(process_##type##_type(state, cache, die)); \
+ break;
+
static int process_type(struct state *state, struct cached_die *parent,
Dwarf_Die *die)
{
@@ -254,9 +291,20 @@ static int process_type(struct state *state, struct cached_die *parent,
}

switch (tag) {
- case DW_TAG_base_type:
- check(process_base_type(state, cache, die));
- break;
+ /* Type modifiers */
+ PROCESS_TYPE(atomic)
+ PROCESS_TYPE(const)
+ PROCESS_TYPE(immutable)
+ PROCESS_TYPE(packed)
+ PROCESS_TYPE(pointer)
+ PROCESS_TYPE(reference)
+ PROCESS_TYPE(restrict)
+ PROCESS_TYPE(rvalue_reference)
+ PROCESS_TYPE(shared)
+ PROCESS_TYPE(volatile)
+ /* Other types */
+ PROCESS_TYPE(base)
+ PROCESS_TYPE(typedef)
default:
debug("unimplemented type: %x", tag);
break;
--
2.45.2.627.g7a2c4fd464-goog