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fpr=35CCFB63B283D6D3AEB783944CB5F6848BBC56EE X-Developer-Signature: v=1; a=openpgp-sha256; l=5712; i=samitolvanen@google.com; h=from:subject; bh=YnxRLubYaRu5LmAQuXzMlCDLmcU4MfVwQeLF/vCiIvY=; b=owGbwMvMwCEWxa662nLh8irG02pJDGkfN3L1la67YPFtm47e9Yi7NkxCfamzy4XMLl5lj5m9K /rKixeLOkpZGMQ4GGTFFFlavq7euvu7U+qrz0USMHNYmUCGMHBxCsBE5r9nZNj8/vKiVccm/U9+ vSH6zSWe6dpHn4hdKnzyTGDmnadP9eYbMDJ8stzpP0lousu3Q983X/VX5Gp0Fm4uvLfoveO/3H0 7CyUZAQ== X-Mailer: git-send-email 2.46.0.792.g87dc391469-goog Message-ID: <20240923181846.549877-30-samitolvanen@google.com> Subject: [PATCH v3 08/20] gendwarfksyms: Expand subroutine_type From: Sami Tolvanen To: Masahiro Yamada , Luis Chamberlain , Miguel Ojeda , Greg Kroah-Hartman Cc: Matthew Maurer , Alex Gaynor , Wedson Almeida Filho , Gary Guo , Petr Pavlu , Neal Gompa , Hector Martin , Janne Grunau , Miroslav Benes , Asahi Linux , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-modules@vger.kernel.org, rust-for-linux@vger.kernel.org, Sami Tolvanen 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 Reviewed-by: Petr Pavlu --- 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) 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,