From 14ae285f344fe76aff1d0da8366cd54599aea730 Mon Sep 17 00:00:00 2001 From: Philippe Waroquiers Date: Sat, 26 Nov 2022 12:43:58 +0100 Subject: [PATCH] Fix jump on uninit producer_is_clang bit of cu.h dwarf2_cu struct. Valgrind reports a "jump on unitialised bit error" when running e.g. gdb.base/macro-source-path.exp (see details below). Fix this by initializing producer_is_clang member variable of dwarf2_cu. Tested on amd64/debian11 and re-running gdb.base/macro-source-path.exp under valgrind. ==2140965== Conditional jump or move depends on uninitialised value(s) ==2140965== at 0x5211F7: dwarf_decode_macro_bytes(dwarf2_per_objfile*, buildsym_compunit*, bfd*, unsigned char const*, unsigned char const*, macro_source_file*, line_header const*, dwarf2_section_info const*, int, int, unsigned int, dwarf2_section_info*, dwarf2_section_info*, gdb::optional, htab*, dwarf2_cu*) (macro.c:676) ==2140965== by 0x52158A: dwarf_decode_macros(dwarf2_per_objfile*, buildsym_compunit*, dwarf2_section_info const*, line_header const*, unsigned int, unsigned int, dwarf2_section_info*, dwarf2_section_info*, gdb::optional, int, dwarf2_cu*) (macro.c:967) ==2140965== by 0x523BC4: dwarf_decode_macros(dwarf2_cu*, unsigned int, int) (read.c:23379) ==2140965== by 0x552AB5: read_file_scope(die_info*, dwarf2_cu*) (read.c:9687) ==2140965== by 0x54F7B2: process_die(die_info*, dwarf2_cu*) (read.c:8660) ==2140965== by 0x5569C7: process_full_comp_unit (read.c:8429) ==2140965== by 0x5569C7: process_queue (read.c:7675) ==2140965== by 0x5569C7: dw2_do_instantiate_symtab (read.c:2063) ==2140965== by 0x5569C7: dw2_instantiate_symtab(dwarf2_per_cu_data*, dwarf2_per_objfile*, bool) (read.c:2085) ==2140965== by 0x55700B: dw2_expand_symtabs_matching_one(dwarf2_per_cu_data*, dwarf2_per_objfile*, gdb::function_view, gdb::function_view) (read.c:3984) ==2140965== by 0x557EA3: cooked_index_functions::expand_symtabs_matching(objfile*, gdb::function_view, lookup_name_info const*, gdb::function_view, gdb::function_view, enum_flags, domain_enum, search_domain) (read.c:18781) ==2140965== by 0x778977: objfile::lookup_symbol(block_enum, char const*, domain_enum) (symfile-debug.c:276) .... ==2140965== Uninitialised value was created by a heap allocation ==2140965== at 0x4839F01: operator new(unsigned long) (vg_replace_malloc.c:434) ==2140965== by 0x533A64: cutu_reader::cutu_reader(dwarf2_per_cu_data*, dwarf2_per_objfile*, abbrev_table*, dwarf2_cu*, bool, abbrev_cache*) (read.c:6264) ==2140965== by 0x5340C2: load_full_comp_unit(dwarf2_per_cu_data*, dwarf2_per_objfile*, dwarf2_cu*, bool, language) (read.c:7729) ==2140965== by 0x548338: load_cu(dwarf2_per_cu_data*, dwarf2_per_objfile*, bool) (read.c:2021) ==2140965== by 0x55634C: dw2_do_instantiate_symtab (read.c:2048) ==2140965== by 0x55634C: dw2_instantiate_symtab(dwarf2_per_cu_data*, dwarf2_per_objfile*, bool) (read.c:2085) ==2140965== by 0x55700B: dw2_expand_symtabs_matching_one(dwarf2_per_cu_data*, dwarf2_per_objfile*, gdb::function_view, gdb::function_view) (read.c:3984) ==2140965== by 0x557EA3: cooked_index_functions::expand_symtabs_matching(objfile*, gdb::function_view, lookup_name_info const*, gdb::function_view, gdb::function_view, enum_flags, domain_enum, search_domain) (read.c:18781) ==2140965== by 0x778977: objfile::lookup_symbol(block_enum, char const*, domain_enum) (symfile-debug.c:276) .... --- gdb/dwarf2/cu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/gdb/dwarf2/cu.c b/gdb/dwarf2/cu.c index e95208e2e75..af95725ebcf 100644 --- a/gdb/dwarf2/cu.c +++ b/gdb/dwarf2/cu.c @@ -39,6 +39,7 @@ dwarf2_cu::dwarf2_cu (dwarf2_per_cu_data *per_cu, producer_is_icc (false), producer_is_icc_lt_14 (false), producer_is_codewarrior (false), + producer_is_clang (false), processing_has_namespace_info (false), load_all_dies (false) { -- 2.30.2