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| author | Tom de Vries <tdevries@suse.de> | 2021-08-27 17:14:49 +0200 |
|---|---|---|
| committer | Tom de Vries <tdevries@suse.de> | 2021-08-27 17:14:49 +0200 |
| commit | 34daac4b169da3cb9df3e8bac6347cae630a99dd (patch) | |
| tree | f3ce338b4bd3c8cf74e39c5376a0d20399a96ca8 | |
| parent | 426f7bbfd4179a5b81f87fa324a854c370e4b07a (diff) | |
| download | gdb-34daac4b169da3cb9df3e8bac6347cae630a99dd.zip gdb-34daac4b169da3cb9df3e8bac6347cae630a99dd.tar.gz gdb-34daac4b169da3cb9df3e8bac6347cae630a99dd.tar.bz2 | |
[gdb/symtab] Don't write .gdb_index symbol table with empty entries
When comparing the sizes of the index files generated for shlib
outputs/gdb.dwarf2/dw2-zero-range/shr1.sl, I noticed a large difference
between .debug_names:
...
$ gdb -q -batch $shlib -ex "save gdb-index -dwarf-5 ."
$ du -b -h shr1.sl.debug_names shr1.sl.debug_str
61 shr1.sl.debug_names
0 shr1.sl.debug_str
...
and .gdb_index:
...
$ gdb -q -batch $shlib -ex "save gdb-index ."
$ du -b -h shr1.sl.gdb-index
8.2K shr1.sl.gdb-index
...
The problem is that the .gdb_index contains a non-empty symbol table with only
empty entries.
Fix this by making the symbol table empty, such that we have instead:
...
$ du -b -h shr1.sl.gdb-index
184 shr1.sl.gdb-index
...
Tested on x86_64-linux.
| -rw-r--r-- | gdb/dwarf2/index-write.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/gdb/dwarf2/index-write.c b/gdb/dwarf2/index-write.c index 4e00c71..5de07a6 100644 --- a/gdb/dwarf2/index-write.c +++ b/gdb/dwarf2/index-write.c @@ -1385,6 +1385,9 @@ write_gdbindex (dwarf2_per_objfile *per_objfile, FILE *out_file, uniquify_cu_indices (&symtab); data_buf symtab_vec, constant_pool; + if (symtab.n_elements == 0) + symtab.data.resize (0); + write_hash_table (&symtab, symtab_vec, constant_pool); write_gdbindex_1(out_file, objfile_cu_list, types_cu_list, addr_vec, |