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 <samitolva...@google.com> --- 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 5fb9eadd782c..d2c6e91a7653 100644 --- a/scripts/gendwarfksyms/dwarf.c +++ b/scripts/gendwarfksyms/dwarf.c @@ -103,6 +103,8 @@ 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); } @@ -549,6 +551,8 @@ 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: @@ -558,6 +562,8 @@ 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: @@ -648,6 +654,9 @@ 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)); + if (want_state == DIE_COMPLETE && is_expanded_type(tag)) cache_mark_expanded(&state->expansion_cache, die->addr); @@ -658,6 +667,9 @@ 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) @@ -693,6 +705,9 @@ 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 66806b0936e4..83b7eb8226dd 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 16d4746aaef9..c913a2421515 100644 --- a/scripts/gendwarfksyms/gendwarfksyms.h +++ b/scripts/gendwarfksyms/gendwarfksyms.h @@ -24,6 +24,7 @@ */ extern int debug; extern int dump_dies; +extern int dump_die_map; /* * Output helpers @@ -46,6 +47,18 @@ 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 */ -- 2.46.0.792.g87dc391469-goog