From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 2205) id 44C1B385736A; Mon, 1 Aug 2022 12:01:03 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 44C1B385736A Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable From: Tom de Vries To: gdb-cvs@sourceware.org Subject: [binutils-gdb] [gdb/symtab] Fix .debug_aranges duplicate offset warning X-Act-Checkin: binutils-gdb X-Git-Author: Tom de Vries X-Git-Refname: refs/heads/master X-Git-Oldrev: e4971956eab2d3091e21918b175cb999a836c057 X-Git-Newrev: 75337cbc1476b7eb403fe0e73c52bf080b5996c8 Message-Id: <20220801120103.44C1B385736A@sourceware.org> Date: Mon, 1 Aug 2022 12:01:03 +0000 (GMT) X-BeenThere: gdb-cvs@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Aug 2022 12:01:03 -0000 https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3D75337cbc1476= b7eb403fe0e73c52bf080b5996c8 commit 75337cbc1476b7eb403fe0e73c52bf080b5996c8 Author: Tom de Vries Date: Mon Aug 1 14:00:59 2022 +0200 [gdb/symtab] Fix .debug_aranges duplicate offset warning =20 The function read_addrmap_from_aranges contains code to issue a warning: ... if (!insertpair.second) { warning (_("Section .debug_aranges in %s has duplicate " "debug_info_offset %s, ignoring .debug_aranges."), objfile_name (objfile), sect_offset_str (per_cu->sect= _off)); return false; } ... but the warning is in fact activated when all_comp_units has duplicate entries, which is very misleading. =20 Fix this by: - adding a test-case that should trigger the warning, - replacing the current implementation of the warning with an assert that all_comp_units should not contain duplicates, and - properly re-implementing the warning, such that it is triggered by the test-case. =20 Tested on x86_64-linux. =20 Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=3D29381 Diff: --- gdb/dwarf2/read.c | 22 ++++-- .../debug-aranges-duplicate-offset-warning.c | 28 ++++++++ .../debug-aranges-duplicate-offset-warning.exp | 81 ++++++++++++++++++= ++++ 3 files changed, 124 insertions(+), 7 deletions(-) diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c index ae0b5d7a773..8c66cb89162 100644 --- a/gdb/dwarf2/read.c +++ b/gdb/dwarf2/read.c @@ -2347,15 +2347,13 @@ read_addrmap_from_aranges (dwarf2_per_objfile *per_= objfile, const auto insertpair =3D debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu.get ()); - if (!insertpair.second) - { - warning (_("Section .debug_aranges in %s has duplicate " - "debug_info_offset %s, ignoring .debug_aranges."), - objfile_name (objfile), sect_offset_str (per_cu->sect_off)); - return false; - } + + /* Assume no duplicate offsets in all_comp_units. */ + gdb_assert (insertpair.second); } =20 + std::set debug_info_offset_seen; + section->read (objfile); =20 const bfd_endian dwarf5_byte_order =3D gdbarch_byte_order (gdbarch); @@ -2413,6 +2411,16 @@ read_addrmap_from_aranges (dwarf2_per_objfile *per_o= bjfile, pulongest (debug_info_offset)); return false; } + const auto insertpair + =3D debug_info_offset_seen.insert (sect_offset (debug_info_offset)); + if (!insertpair.second) + { + warning (_("Section .debug_aranges in %s has duplicate " + "debug_info_offset %s, ignoring .debug_aranges."), + objfile_name (objfile), + sect_offset_str (sect_offset (debug_info_offset))); + return false; + } dwarf2_per_cu_data *const per_cu =3D per_cu_it->second; =20 const uint8_t address_size =3D *addr++; diff --git a/gdb/testsuite/gdb.dwarf2/debug-aranges-duplicate-offset-warnin= g.c b/gdb/testsuite/gdb.dwarf2/debug-aranges-duplicate-offset-warning.c new file mode 100644 index 00000000000..7fdea625913 --- /dev/null +++ b/gdb/testsuite/gdb.dwarf2/debug-aranges-duplicate-offset-warning.c @@ -0,0 +1,28 @@ +/* + Copyright 2022 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . = */ + +void +frame2 (void) +{ + asm ("frame2_label: .globl frame2_label"); +} + +int +main (void) +{ + asm ("main_label: .globl main_label"); + frame2 (); +} diff --git a/gdb/testsuite/gdb.dwarf2/debug-aranges-duplicate-offset-warnin= g.exp b/gdb/testsuite/gdb.dwarf2/debug-aranges-duplicate-offset-warning.exp new file mode 100644 index 00000000000..0e0e0cb893b --- /dev/null +++ b/gdb/testsuite/gdb.dwarf2/debug-aranges-duplicate-offset-warning.exp @@ -0,0 +1,81 @@ +# Copyright 2022 Free Software Foundation, Inc. + +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . +load_lib dwarf.exp + +# Test with two aranges entries referring to the same CU. + +# This test can only be run on targets which support DWARF-2 and use gas. +if {![dwarf2_support]} { + verbose "Skipping $gdb_test_file_name." + return 0 +} + +standard_testfile .c -dw.S + +set asm_file [standard_output_file $srcfile2] +Dwarf::assemble $asm_file { + global srcdir subdir srcfile srcfile2 + declare_labels ranges_label + + get_func_info main + get_func_info frame2 + + cu { label cu_label } { + compile_unit { + {language @DW_LANG_C} + {name $srcfile} + } { + subprogram { + {external 1 flag} + {name main} + {low_pc $main_start addr} + {high_pc $main_len DW_FORM_data4} + } + subprogram { + {external 1 flag} + {name frame2} + {low_pc $frame2_start addr} + {high_pc $frame2_len DW_FORM_data4} + } + } + } + + aranges {} cu_label { + arange {} $main_start $main_len + } + aranges {} cu_label { + arange {} $frame2_start $frame2_len + } +} + +if { [prepare_for_testing "failed to prepare" ${testfile} \ + [list $srcfile $asm_file] {nodebug}] } { + return -1 +} + +set readnow_p [readnow] + +set test "file command warnings" +if { $readnow_p } { + set re "warning:" + gdb_assert { ![regexp $re $gdb_file_cmd_msg] } $test +} else { + set re \ + [concat \ + "warning: Section .debug_aranges in \[^\r\n\]* has" \ + "duplicate debug_info_offset $hex," \ + "ignoring \\.debug_aranges\\."] + gdb_assert { [regexp $re $gdb_file_cmd_msg] } $test +}