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a=openpgp; fpr=35CCFB63B283D6D3AEB783944CB5F6848BBC56EE X-Developer-Signature: v=1; a=openpgp-sha256; l=5405; i=samitolvanen@google.com; h=from:subject; bh=bbCvhhmVnhtTYpDrJYZHLEm7Ii+2fqEhxzWaIoSVp4g=; b=owGbwMvMwCEWxa662nLh8irG02pJDOkVPsmTOfLeOSXc/yAtcG3KRvG375YYlxx89vqYa396Q 3azF9fhjlIWBjEOBlkxRZaWr6u37v7ulPrqc5EEzBxWJpAhDFycAjARg1aGfxqTV60rutuYsoaB 8Vo283XPdyv+hx/XvztLJ3VZCdvBn08Y/te9qVz5j++Wn4jAS4FNnxVmL69ISr+xddpPp7sBa61 M8tkA X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20250103204521.1885406-23-samitolvanen@google.com> Subject: [PATCH v8 03/18] gendwarfksyms: Expand base_type From: Sami Tolvanen To: Masahiro Yamada , Luis Chamberlain , Miguel Ojeda , Greg Kroah-Hartman Cc: Matthew Maurer , Alex Gaynor , Gary Guo , Petr Pavlu , Daniel Gomez , Neal Gompa , Hector Martin , Janne Grunau , Miroslav Benes , Asahi Linux , Sedat Dilek , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-modules@vger.kernel.org, rust-for-linux@vger.kernel.org, Sami Tolvanen Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Start making gendwarfksyms more useful by adding support for expanding DW_TAG_base_type types and basic DWARF attributes. Example: $ echo loops_per_jiffy | \ scripts/gendwarfksyms/gendwarfksyms \ --debug --dump-dies vmlinux.o ... gendwarfksyms: process_symbol: loops_per_jiffy variable base_type unsigned long byte_size(8) encoding(7) ... Signed-off-by: Sami Tolvanen Reviewed-by: Petr Pavlu --- scripts/gendwarfksyms/dwarf.c | 160 ++++++++++++++++++++++++++++++++++ 1 file changed, 160 insertions(+) diff --git a/scripts/gendwarfksyms/dwarf.c b/scripts/gendwarfksyms/dwarf.c index 81df3e2ad3ae..74e75b8ec891 100644 --- a/scripts/gendwarfksyms/dwarf.c +++ b/scripts/gendwarfksyms/dwarf.c @@ -3,8 +3,21 @@ * Copyright (C) 2024 Google LLC */ =20 +#include +#include #include "gendwarfksyms.h" =20 +#define DEFINE_GET_ATTR(attr, type) \ + static bool get_##attr##_attr(Dwarf_Die *die, unsigned int id, \ + type *value) \ + { \ + Dwarf_Attribute da; \ + return dwarf_attr(die, id, &da) && \ + !dwarf_form##attr(&da, value); \ + } + +DEFINE_GET_ATTR(udata, Dwarf_Word) + static bool get_ref_die_attr(Dwarf_Die *die, unsigned int id, Dwarf_Die *v= alue) { Dwarf_Attribute da; @@ -67,6 +80,109 @@ static void process(const char *s) fputs(s, stderr); } =20 +#define MAX_FMT_BUFFER_SIZE 128 + +static void process_fmt(const char *fmt, ...) +{ + char buf[MAX_FMT_BUFFER_SIZE]; + va_list args; + + va_start(args, fmt); + + if (checkp(vsnprintf(buf, sizeof(buf), fmt, args)) >=3D sizeof(buf)) + error("vsnprintf overflow: increase MAX_FMT_BUFFER_SIZE"); + + process(buf); + va_end(args); +} + +#define MAX_FQN_SIZE 64 + +/* Get a fully qualified name from DWARF scopes */ +static char *get_fqn(Dwarf_Die *die) +{ + const char *list[MAX_FQN_SIZE]; + Dwarf_Die *scopes =3D NULL; + bool has_name =3D false; + char *fqn =3D NULL; + char *p; + int count =3D 0; + int len =3D 0; + int res; + int i; + + res =3D checkp(dwarf_getscopes_die(die, &scopes)); + if (!res) { + list[count] =3D get_name_attr(die); + + if (!list[count]) + return NULL; + + len +=3D strlen(list[count]); + count++; + + goto done; + } + + for (i =3D res - 1; i >=3D 0 && count < MAX_FQN_SIZE; i--) { + if (dwarf_tag(&scopes[i]) =3D=3D DW_TAG_compile_unit) + continue; + + list[count] =3D get_name_attr(&scopes[i]); + + if (list[count]) { + has_name =3D true; + } else { + list[count] =3D ""; + has_name =3D false; + } + + len +=3D strlen(list[count]); + count++; + + if (i > 0) { + list[count++] =3D "::"; + len +=3D 2; + } + } + + free(scopes); + + if (count =3D=3D MAX_FQN_SIZE) + warn("increase MAX_FQN_SIZE: reached the maximum"); + + /* Consider the DIE unnamed if the last scope doesn't have a name */ + if (!has_name) + return NULL; +done: + fqn =3D xmalloc(len + 1); + *fqn =3D '\0'; + + p =3D fqn; + for (i =3D 0; i < count; i++) + p =3D stpcpy(p, list[i]); + + return fqn; +} + +static void process_fqn(Dwarf_Die *die) +{ + process(" "); + process(get_fqn(die) ?: ""); +} + +#define DEFINE_PROCESS_UDATA_ATTRIBUTE(attribute) = \ + static void process_##attribute##_attr(Dwarf_Die *die) \ + { \ + Dwarf_Word value; \ + if (get_udata_attr(die, DW_AT_##attribute, &value)) \ + process_fmt(" " #attribute "(%" PRIu64 ")", value); \ + } + +DEFINE_PROCESS_UDATA_ATTRIBUTE(alignment) +DEFINE_PROCESS_UDATA_ATTRIBUTE(byte_size) +DEFINE_PROCESS_UDATA_ATTRIBUTE(encoding) + bool match_all(Dwarf_Die *die) { return true; @@ -93,6 +209,49 @@ int process_die_container(struct state *state, Dwarf_Di= e *die, return 0; } =20 +static int process_type(struct state *state, Dwarf_Die *die); + +static void process_type_attr(struct state *state, Dwarf_Die *die) +{ + Dwarf_Die type; + + if (get_ref_die_attr(die, DW_AT_type, &type)) { + check(process_type(state, &type)); + return; + } + + /* Compilers can omit DW_AT_type -- print out 'void' to clarify */ + process("base_type void"); +} + +static void process_base_type(struct state *state, Dwarf_Die *die) +{ + process("base_type"); + process_fqn(die); + process_byte_size_attr(die); + process_encoding_attr(die); + process_alignment_attr(die); +} + +#define PROCESS_TYPE(type) \ + case DW_TAG_##type##_type: \ + process_##type##_type(state, die); \ + break; + +static int process_type(struct state *state, Dwarf_Die *die) +{ + int tag =3D dwarf_tag(die); + + switch (tag) { + PROCESS_TYPE(base) + default: + debug("unimplemented type: %x", tag); + break; + } + + return 0; +} + /* * Exported symbol processing */ @@ -119,6 +278,7 @@ static void process_subprogram(struct state *state, Dwa= rf_Die *die) static int __process_variable(struct state *state, Dwarf_Die *die) { process("variable "); + process_type_attr(state, die); return 0; } =20 --=20 2.47.1.613.gc27f4b7a9f-goog