From FEDORA_PATCHES Mon Sep 17 00:00:00 2001 From: Keith Seitz Date: Wed, 5 May 2021 13:57:13 -0700 Subject: gdb-rhbz1934673-fortran-nameless-modules.patch ;; Fix segfault with nameless fortran modules. ;; Bernhard Heckel, RH BZ 1943673 Dwarf: Don't add nameless modules to partial symbol table A name for BLOCK DATA in Fortran is optional. If no name has been assigned, GDB crashes during read-in of DWARF when BLOCK DATA is represented via DW_TAG_module. BLOCK DATA is used for one-time initialization of non-pointer variables in named common blocks. As of now there is no issue when gfortran is used as DW_TAG_module is not emitted. However, with Intel ifort the nameless DW_TAG_module is present and has the following form: ... <1>
: Abbrev Number: 7 (DW_TAG_module) DW_AT_decl_line : 46 DW_AT_decl_file : 1 DW_AT_description : (indirect string, offset: 0x110): block data DW_AT_high_pc : 0x402bb7 DW_AT_low_pc : 0x402bb7 ... The missing name leads to a crash in add_partial_symbol, during length calculation. gdb/ChangeLog: 2019-06-11 Bernhard Heckel * dwarf2read.c (add_partial_symbol): Skip nameless modules. gdb/testsuite/Changelog: 2019-06-11 Bernhard Heckel * gdb.fortran/block-data.f: New. * gdb.fortran/block-data.exp: New. diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c --- a/gdb/dwarf2read.c +++ b/gdb/dwarf2read.c @@ -8936,11 +8936,15 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu) 0, cu->language, objfile); break; case DW_TAG_module: - add_psymbol_to_list (actual_name, strlen (actual_name), - built_actual_name != NULL, - MODULE_DOMAIN, LOC_TYPEDEF, - &objfile->global_psymbols, - 0, cu->language, objfile); + /* With Fortran 77 there might be a "BLOCK DATA" module + available without any name. If so, we skip the module as it + doesn't bring any value. */ + if (actual_name != nullptr) + add_psymbol_to_list (actual_name, strlen (actual_name), + built_actual_name != NULL, + MODULE_DOMAIN, LOC_TYPEDEF, + &objfile->global_psymbols, + 0, cu->language, objfile); break; case DW_TAG_class_type: case DW_TAG_interface_type: @@ -16777,9 +16781,6 @@ read_module_type (struct die_info *die, struct dwarf2_cu *cu) struct type *type; module_name = dwarf2_name (die, cu); - if (!module_name) - complaint (_("DW_TAG_module has no name, offset %s"), - sect_offset_str (die->sect_off)); type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name); return set_die_type (die, type, cu); diff --git a/gdb/testsuite/gdb.fortran/block-data.exp b/gdb/testsuite/gdb.fortran/block-data.exp new file mode 100644 --- /dev/null +++ b/gdb/testsuite/gdb.fortran/block-data.exp @@ -0,0 +1,63 @@ +# Copyright 2016-2019 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 . + +# Test anonymous block-data statements. + +# A name for BLOCK DATA in Fortran is optional. BLOCK DATA is used +# for one-time initialization of non-pointer variables in named common +# blocks. GDB used to crash with 'Intel ifort'-generated code, which +# outputs nameless DW_TAG_module, unlike with gfortran which just +# doesn't emit DW_TAG_module in this case. + +if { [skip_fortran_tests] } { return -1 } + +standard_testfile .f +load_lib "fortran.exp" + +if {[prepare_for_testing $testfile.exp $testfile $srcfile {debug f90}]} { + return -1 +} + +if ![runto MAIN__] then { + untested "couldn't run to breakpoint MAIN__" + return -1 +} + +with_test_prefix "default values" { + gdb_test "print doub1" "= 1\.11\\d+" + gdb_test "print doub2" "= 2\.22\\d+" + gdb_test "print char1" "= 'abcdef'" + gdb_test "print char2" "= 'ghijkl'" +} + +gdb_breakpoint [gdb_get_line_number "! BP_BEFORE_SUB"] +gdb_continue_to_breakpoint "! BP_BEFORE_SUB" ".*! BP_BEFORE_SUB.*" + +with_test_prefix "before sub" { + gdb_test "print doub1" "= 11\.11\\d+" + gdb_test "print doub2" "= 22\.22\\d+" + gdb_test "print char1" "= 'ABCDEF'" + gdb_test "print char2" "= 'GHIJKL'" +} + +gdb_breakpoint [gdb_get_line_number "! BP_SUB"] +gdb_continue_to_breakpoint "! BP_SUB" ".*! BP_SUB.*" + +with_test_prefix "in sub" { + gdb_test "print doub1" "= 11\.11\\d+" + gdb_test "print doub2" "= 22\.22\\d+" + gdb_test "print char1" "= 'ABCDEF'" + gdb_test "print char2" "= 'GHIJKL'" +} diff --git a/gdb/testsuite/gdb.fortran/block-data.f b/gdb/testsuite/gdb.fortran/block-data.f new file mode 100644 --- /dev/null +++ b/gdb/testsuite/gdb.fortran/block-data.f @@ -0,0 +1,56 @@ +! Copyright 2016-2019 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 . +! +! Check that GDB can handle block data with no global name. +! +! MAIN + PROGRAM bdata + DOUBLE PRECISION doub1, doub2 + CHARACTER*6 char1, char2 + + COMMON /BLK1/ doub1, char1 + COMMON /BLK2/ doub2, char2 + + doub1 = 11.111 + doub2 = 22.222 + char1 = 'ABCDEF' + char2 = 'GHIJKL' + CALL sub_block_data ! BP_BEFORE_SUB + STOP + END + +! BLOCK DATA + BLOCK DATA + + DOUBLE PRECISION doub1, doub2 + CHARACTER*6 char1, char2 + + COMMON /BLK1/ doub1, char1 + COMMON /BLK2/ doub2, char2 + DATA doub1, doub2 /1.111, 2.222/ + DATA char1, char2 /'abcdef', 'ghijkl'/ + END + +! SUBROUTINE + SUBROUTINE sub_block_data + + DOUBLE PRECISION doub1, doub2 + CHARACTER*6 char1, char2 + + COMMON /BLK1/ doub1, char1 + COMMON /BLK2/ doub2, char2 + + char1 = char2; ! BP_SUB + END