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AJvYcCX4QkMo2grWLn7Z9jcssgAkBmRihStyM3IyiNe/ftSatK0Yjsss3uk5MEMUaSejajZ95av5fVkrEzFu1c7j@vger.kernel.org X-Gm-Message-State: AOJu0YwI0S63AP/IHxQAHKRbtdv21/2GdN/W3B2agZhZOb2iLqTI7Q6h /nFFUc2W3JUdOHA5k6o5wiXgWXwLj3F+i/ijC0dsmSPhpcQUgSXfoI0Hc6hLho2cmYJJ76l/gAd y4dmc/Nxz5Q9SmN5y72cXpMAafQ== X-Google-Smtp-Source: AGHT+IGsvhnsnrZz7y6skRItADeCqn8aWPQ51xtGa1NURNHB9v1UiuF4WhjQJfrq8s7XEv92esfmgAi1sMsb7EbrY8A= X-Received: from samitolvanen.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:4f92]) (user=samitolvanen job=sendgmr) by 2002:a25:9a43:0:b0:e38:164f:5bf2 with SMTP id 3f1490d57ef6-e38f8bffec0mr123276.9.1732221772935; Thu, 21 Nov 2024 12:42:52 -0800 (PST) Date: Thu, 21 Nov 2024 20:42:31 +0000 In-Reply-To: <20241121204220.2378181-20-samitolvanen@google.com> Precedence: bulk X-Mailing-List: linux-modules@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241121204220.2378181-20-samitolvanen@google.com> X-Developer-Key: i=samitolvanen@google.com; a=openpgp; fpr=35CCFB63B283D6D3AEB783944CB5F6848BBC56EE X-Developer-Signature: v=1; a=openpgp-sha256; l=5088; i=samitolvanen@google.com; h=from:subject; bh=ZtfhRREvYeeJIRTnypn2kVeALnWdluQMXmr8x8azY3w=; b=owGbwMvMwCEWxa662nLh8irG02pJDOn2s42iDr5bcna6UMhtz/d1vz0EFWw31nZeKz9+w7Td+ fnVqreTO0pZGMQ4GGTFFFlavq7euvu7U+qrz0USMHNYmUCGMHBxCsBEFq9mZLhUXOVTfsaB82X1 PA/2x6LfVh2N8vjcLdgjzXHt8ROFyicM/zSN1+99Kqzcuuxl92+vXz3B7G93+D8TFvi6+qiNmYM ELzcA X-Mailer: git-send-email 2.47.0.371.ga323438b13-goog Message-ID: <20241121204220.2378181-30-samitolvanen@google.com> Subject: [PATCH v6 10/18] gendwarfksyms: Add die_map debugging 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 Debugging the DWARF processing can be somewhat challenging, so add more detailed debugging output for die_map operations. Add the --dump-die-map flag, which adds color coded tags to the output for die_map changes. Signed-off-by: Sami Tolvanen Reviewed-by: Petr Pavlu --- scripts/gendwarfksyms/dwarf.c | 15 +++++++++++++++ scripts/gendwarfksyms/gendwarfksyms.c | 7 +++++++ scripts/gendwarfksyms/gendwarfksyms.h | 13 +++++++++++++ 3 files changed, 35 insertions(+) diff --git a/scripts/gendwarfksyms/dwarf.c b/scripts/gendwarfksyms/dwarf.c index 3ea7583e6c3f..cf6d2c2844dc 100644 --- a/scripts/gendwarfksyms/dwarf.c +++ b/scripts/gendwarfksyms/dwarf.c @@ -145,6 +145,8 @@ static void process(struct die *cache, const char *s) if (dump_dies) fputs(s, stderr); + if (cache) + die_debug_r("cache %p string '%s'", cache, s); die_map_add_string(cache, s); } @@ -593,6 +595,8 @@ static void process_cached(struct state *state, struct die *cache, list_for_each_entry(df, &cache->fragments, list) { switch (df->type) { case FRAGMENT_STRING: + die_debug_b("cache %p STRING '%s'", cache, + df->data.str); process(NULL, df->data.str); break; case FRAGMENT_LINEBREAK: @@ -602,6 +606,8 @@ static void process_cached(struct state *state, struct die *cache, if (!dwarf_die_addr_die(dwarf_cu_getdwarf(die->cu), (void *)df->data.addr, &child)) error("dwarf_die_addr_die failed"); + die_debug_b("cache %p DIE addr %" PRIxPTR " tag %x", + cache, df->data.addr, dwarf_tag(&child)); check(process_type(state, NULL, &child)); break; default: @@ -670,6 +676,9 @@ static int process_type(struct state *state, struct die *parent, Dwarf_Die *die) cache = die_map_get(die, want_state); if (cache->state == want_state) { + die_debug_g("cached addr %p tag %x -- %s", die->addr, tag, + die_state_name(cache->state)); + process_cached(state, cache, die); die_map_add_die(parent, cache); @@ -677,6 +686,9 @@ static int process_type(struct state *state, struct die *parent, Dwarf_Die *die) return 0; } + die_debug_g("addr %p tag %x -- %s -> %s", die->addr, tag, + die_state_name(cache->state), die_state_name(want_state)); + switch (tag) { /* Type modifiers */ PROCESS_TYPE(atomic) @@ -712,6 +724,9 @@ static int process_type(struct state *state, struct die *parent, Dwarf_Die *die) error("unexpected type: %x", tag); } + die_debug_r("parent %p cache %p die addr %p tag %x", parent, cache, + die->addr, tag); + /* Update cache state and append to the parent (if any) */ cache->tag = tag; cache->state = want_state; diff --git a/scripts/gendwarfksyms/gendwarfksyms.c b/scripts/gendwarfksyms/gendwarfksyms.c index 7552fde495ef..ed6d8c585268 100644 --- a/scripts/gendwarfksyms/gendwarfksyms.c +++ b/scripts/gendwarfksyms/gendwarfksyms.c @@ -19,6 +19,8 @@ int debug; /* Dump DIE contents */ int dump_dies; +/* Print debugging information about die_map changes */ +int dump_die_map; static void usage(void) { @@ -26,6 +28,7 @@ static void usage(void) "Options:\n" " -d, --debug Print debugging information\n" " --dump-dies Dump DWARF DIE contents\n" + " --dump-die-map Print debugging information about die_map changes\n" " -h, --help Print this message\n" "\n", stderr); @@ -74,6 +77,7 @@ int main(int argc, char **argv) struct option opts[] = { { "debug", 0, NULL, 'd' }, { "dump-dies", 0, &dump_dies, 1 }, + { "dump-die-map", 0, &dump_die_map, 1 }, { "help", 0, NULL, 'h' }, { 0, 0, NULL, 0 } }; @@ -93,6 +97,9 @@ int main(int argc, char **argv) } } + if (dump_die_map) + dump_dies = 1; + if (optind >= argc) { usage(); error("no input files?"); diff --git a/scripts/gendwarfksyms/gendwarfksyms.h b/scripts/gendwarfksyms/gendwarfksyms.h index 7b29d8f07aa0..10fb476a7b76 100644 --- a/scripts/gendwarfksyms/gendwarfksyms.h +++ b/scripts/gendwarfksyms/gendwarfksyms.h @@ -26,6 +26,7 @@ */ extern int debug; extern int dump_dies; +extern int dump_die_map; /* * Output helpers @@ -48,6 +49,18 @@ extern int dump_dies; exit(1); \ } while (0) +#define __die_debug(color, format, ...) \ + do { \ + if (dump_dies && dump_die_map) \ + fprintf(stderr, \ + "\033[" #color "m<" format ">\033[39m", \ + __VA_ARGS__); \ + } while (0) + +#define die_debug_r(format, ...) __die_debug(91, format, __VA_ARGS__) +#define die_debug_g(format, ...) __die_debug(92, format, __VA_ARGS__) +#define die_debug_b(format, ...) __die_debug(94, format, __VA_ARGS__) + /* * Error handling helpers */