Description of problem: eu-readelf --debug-dump=info libdw-0.164.so missed parameter "match_file" of the function "dwarf_getscopevar": [ 2ef22] subprogram external (flag_present) Yes name (strp) "dwarf_getscopevar" decl_file (data1) 1 decl_line (data1) 66 prototyped (flag_present) Yes type (ref4) [ 2def1] low_pc (addr) +0x000000000000fedc <dwarf_getscopevar> high_pc (data8) 629 (+0x0000000000010151 <dwarf_linesrc>) frame_base (exprloc) [ 0] call_frame_cfa GNU_all_call_sites (flag_present) Yes sibling (ref4) [ 2f2a6] [ 2ef43] formal_parameter name (strp) "scopes" decl_file (data1) 1 decl_line (data1) 66 type (ref4) [ 2ee79] location (sec_offset) location list [ 12cba] [ 2ef52] formal_parameter name (strp) "nscopes" decl_file (data1) 1 decl_line (data1) 66 type (ref4) [ 2def1] location (sec_offset) location list [ 12d2c] [ 2ef61] formal_parameter name (strp) "name" decl_file (data1) 1 decl_line (data1) 67 type (ref4) [ 2def8] location (sec_offset) location list [ 12d78] [ 2ef70] formal_parameter name (strp) "skip_shadows" decl_file (data1) 1 decl_line (data1) 67 type (ref4) [ 2def1] location (sec_offset) location list [ 12dc4] [ 2ef7f] formal_parameter name (strp) "match_lineno" decl_file (data1) 1 decl_line (data1) 68 type (ref4) [ 2def1] location (sec_offset) location list [ 12e4c] [ 2ef8e] formal_parameter name (strp) "match_linecol" decl_file (data1) 1 decl_line (data1) 68 type (ref4) [ 2def1] location (exprloc) [ 0] fbreg 0 [ 2ef9c] formal_parameter name (strp) "result" decl_file (data1) 1 decl_line (data1) 69 type (ref4) [ 2ee79] location (exprloc) [ 0] fbreg 8 The function signature from header: extern int dwarf_getscopevar (Dwarf_Die *scopes, int nscopes, const char *name, int skip_shadows, const char *match_file, int match_lineno, int match_linecol, Dwarf_Die *result); Version-Release number of selected component (if applicable): eu-readelf from elfutils-0.166 How reproducible: always Steps to Reproduce: 1. Download elfutils-0.164 2. Configure with CFLAGS="-g -Og" CXXFLAGS="-g -Og" 3. eu-readelf --debug-dump=info libdw-0.164.so > OUT 4. Search for dwarf_getscopevar parameters in the output Actual results: Missed match_file parameter in the debug info output Expected results: The match_file parameter is present in the debug info output Additional info: Fedora 21/x86_64 environment. Thank you.
I don't have a F21 environment here, but note that F21 is out of support since last year and contains elfutils 0.163. I don't see this issue on newer Fedora releases. e.g eu-readelf --debug-dump=info /usr/lib/debug/usr/lib64/libdw.so.debug on from elfutils-debuginfo-0.166-1.fc23.x86_64: [ 15eb0] subprogram external (flag_present) Yes name (strp) "dwarf_getscopevar" decl_file (data1) 1 decl_line (data1) 86 prototyped (flag_present) Yes type (GNU_ref_alt) [ 14] low_pc (addr) +0x0000000000011520 <dwarf_getscopevar> high_pc (udata) 925 (+0x00000000000118bd) frame_base (exprloc) [ 0] call_frame_cfa GNU_all_call_sites (flag_present) Yes sibling (ref_udata) [ 162b6] [...] [ 15ef6] formal_parameter name (strp) "skip_shadows" decl_file (data1) 1 decl_line (data1) 87 type (GNU_ref_alt) [ 14] location (sec_offset) location list [ 1a4b9] [ 15f05] formal_parameter name (strp) "match_file" decl_file (data1) 1 decl_line (data1) 88 type (GNU_ref_alt) [ 4d7] location (sec_offset) location list [ 1a502] [ 15f14] formal_parameter name (strp) "match_lineno" decl_file (data1) 1 decl_line (data1) 88 type (GNU_ref_alt) [ 14] location (sec_offset) location list [ 1a562] [ 15f23] formal_parameter name (strp) "match_linecol" decl_file (data1) 1 decl_line (data1) 88 type (GNU_ref_alt) [ 14] location (exprloc) [ 0] fbreg 0 [ 15f31] formal_parameter name (GNU_strp_alt) "result" decl_file (data1) 1 decl_line (data1) 89 type (ref_addr) [ 2879] location (exprloc) [ 0] fbreg 8 I think this might be an issue with the compiler you are using. eu-readelf --debug-dump=info just shows what the DWARF generator produced as output.
It works on the elfutils-0.166 as input. The issue is reproduced on the elfutils-0.164 as input only: eu-readelf-0.166 --debug-dump=info libdw-0.164.so Unfortunately, my notebook is not supported by f22 and f23 anymore. I've upgraded elfutils to 0.166 manually, but this didn't solve the issue. I need to analyze previous releases of the elfutils library using eu-readelf from the latest elfutils. See http://abi-laboratory.pro/tracker/timeline/elfutils/ project. The eu-readelf is used to extract ABI interface structure from all releases of the library including 0.164. I'll try to upgrade the GCC. Thank you.
The issue persists with GCC 5.1.0. Why GCC doesn't generate debug info for this parameter? Please try to check for the parameter in the 0.164 version of libdw in your environment: https://fedorahosted.org/releases/e/l/elfutils/0.164/elfutils-0.164.tar.bz2 Thank you.
Interesting. You are right. Just building the elfutils-0.164 with a simple configure && make with GNU C99 5.3.1 20160406 (Red Hat 5.3.1-6) does indeed not output DWARF for the match_file formal_parameter in the dwarf_getscopevar function. While it does output all other formal_parameters. I have no idea how that happens. But it is a bug in GCC (the producer), not eu-readelf (the consumer) of the data.
Found something interesting. Same compiler building dwarf_getscopevar.c against elfutils git gets you all formal_parameters as expected. The difference between the 0.164 and current git version is that the dwarf_getscopevar () function had an inner function that was moved to an static file scoped function in git.
This is a GCC DWARF producer bug. In this case one of the DW_TAG_formal_parameters is missing if the function has an inner function. The issue can be seen by building elfutils-0.164 vs elfutils-0.165 and comparing the debuginfo created for the dwarf_getscopevar function in libdw/dwarf_getscopevar.o
FWIW, it's not exactly missing, it is rather emitted as a regular variable, presumably as a consequence of the transformations that variables used by inner functions undergo in order to make the static chain.
This bug appears to have been reported against 'rawhide' during the Fedora 25 development cycle. Changing version to '25'.
Posted to GCC Bugzilla: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80300
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