[PATCH v2 09/19] gendwarfksyms: Expand array_type

[Sami Tolvanen]

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

Example source code:

  const char *s[34];

Output with --debug:

  variable array_type [34] {
    pointer_type <unnamed> {
      const_type <unnamed> {
        base_type char byte_size(1) encoding(6)
      }
    } byte_size(8)
  };

Signed-off-by: Sami Tolvanen <samitolva...@google.com>
---
 scripts/gendwarfksyms/dwarf.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/scripts/gendwarfksyms/dwarf.c b/scripts/gendwarfksyms/dwarf.c
index c81652426be8..4ec69fce95f3 100644
--- a/scripts/gendwarfksyms/dwarf.c
+++ b/scripts/gendwarfksyms/dwarf.c
@@ -218,6 +218,7 @@ DEFINE_PROCESS_UDATA_ATTRIBUTE(encoding)
        }
 
 DEFINE_MATCH(formal_parameter)
+DEFINE_MATCH(subrange)
 
 bool match_all(Dwarf_Die *die)
 {
@@ -309,6 +310,34 @@ DEFINE_PROCESS_TYPE(shared)
 DEFINE_PROCESS_TYPE(volatile)
 DEFINE_PROCESS_TYPE(typedef)
 
+static int process_subrange_type(struct state *state, struct 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));
+       if (get_udata_attr(die, DW_AT_upper_bound, &count))
+               return check(
+                       process_fmt(state, cache, "[%" PRIu64 "]", count + 1));
+
+       return check(process(state, cache, "[]"));
+}
+
+static int process_array_type(struct state *state, struct 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 die *cache,
                                     Dwarf_Die *die, const char *type)
 {
@@ -411,7 +440,9 @@ static int process_type(struct state *state, struct die 
*parent, Dwarf_Die *die)
        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)
-- 
2.46.0.184.g6999bdac58-goog