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><dd>: Abbrev Number: 7 (DW_TAG_module)
<de> DW_AT_decl_line : 46
<df> DW_AT_decl_file : 1
<e0> DW_AT_description : (indirect string, offset: 0x110): block
data
<e4> DW_AT_high_pc : 0x402bb7
<ec> 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 <bernhard.heckel@intel.com>
* dwarf2read.c (add_partial_symbol): Skip nameless modules.
gdb/testsuite/Changelog:
2019-06-11 Bernhard Heckel <bernhard.heckel@intel.com>
* gdb.fortran/block-data.f: New.
* gdb.fortran/block-data.exp: New.
This commit is contained in:
Bernhard Heckel
Pedro Alves
parent
2057d69dcc
commit
a5fd13a915
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@ -9018,11 +9018,15 @@ add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
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0, cu->language, objfile);
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break;
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case DW_TAG_module:
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add_psymbol_to_list (actual_name, strlen (actual_name),
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built_actual_name != NULL,
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MODULE_DOMAIN, LOC_TYPEDEF, -1,
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psymbol_placement::GLOBAL,
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0, cu->language, objfile);
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/* With Fortran 77 there might be a "BLOCK DATA" module
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available without any name. If so, we skip the module as it
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doesn't bring any value. */
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if (actual_name != nullptr)
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add_psymbol_to_list (actual_name, strlen (actual_name),
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built_actual_name != NULL,
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MODULE_DOMAIN, LOC_TYPEDEF, -1,
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psymbol_placement::GLOBAL,
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0, cu->language, objfile);
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break;
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case DW_TAG_class_type:
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case DW_TAG_interface_type:
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@ -16955,9 +16959,6 @@ read_module_type (struct die_info *die, struct dwarf2_cu *cu)
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struct type *type;
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module_name = dwarf2_name (die, cu);
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if (!module_name)
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complaint (_("DW_TAG_module has no name, offset %s"),
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sect_offset_str (die->sect_off));
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type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
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return set_die_type (die, type, cu);
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@ -0,0 +1,63 @@
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# Copyright 2016-2019 Free Software Foundation, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Test anonymous block-data statements.
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# A name for BLOCK DATA in Fortran is optional. BLOCK DATA is used
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# for one-time initialization of non-pointer variables in named common
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# blocks. GDB used to crash with 'Intel ifort'-generated code, which
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# outputs nameless DW_TAG_module, unlike with gfortran which just
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# doesn't emit DW_TAG_module in this case.
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if { [skip_fortran_tests] } { return -1 }
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standard_testfile .f
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load_lib "fortran.exp"
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if {[prepare_for_testing $testfile.exp $testfile $srcfile {debug f90}]} {
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return -1
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}
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if ![runto MAIN__] then {
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untested "couldn't run to breakpoint MAIN__"
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return -1
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}
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with_test_prefix "default values" {
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gdb_test "print doub1" "= 1\.11\\d+"
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gdb_test "print doub2" "= 2\.22\\d+"
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gdb_test "print char1" "= 'abcdef'"
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gdb_test "print char2" "= 'ghijkl'"
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}
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gdb_breakpoint [gdb_get_line_number "! BP_BEFORE_SUB"]
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gdb_continue_to_breakpoint "! BP_BEFORE_SUB" ".*! BP_BEFORE_SUB.*"
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with_test_prefix "before sub" {
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gdb_test "print doub1" "= 11\.11\\d+"
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gdb_test "print doub2" "= 22\.22\\d+"
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gdb_test "print char1" "= 'ABCDEF'"
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gdb_test "print char2" "= 'GHIJKL'"
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}
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gdb_breakpoint [gdb_get_line_number "! BP_SUB"]
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gdb_continue_to_breakpoint "! BP_SUB" ".*! BP_SUB.*"
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with_test_prefix "in sub" {
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gdb_test "print doub1" "= 11\.11\\d+"
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gdb_test "print doub2" "= 22\.22\\d+"
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gdb_test "print char1" "= 'ABCDEF'"
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gdb_test "print char2" "= 'GHIJKL'"
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}
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@ -0,0 +1,56 @@
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! Copyright 2016-2019 Free Software Foundation, Inc.
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!
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! This program is free software; you can redistribute it and/or modify
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! it under the terms of the GNU General Public License as published by
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! the Free Software Foundation; either version 3 of the License, or
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! (at your option) any later version.
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!
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! This program is distributed in the hope that it will be useful,
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! but WITHOUT ANY WARRANTY; without even the implied warranty of
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! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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! GNU General Public License for more details.
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!
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! You should have received a copy of the GNU General Public License
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! along with this program. If not, see <http://www.gnu.org/licenses/>.
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!
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! Check that GDB can handle block data with no global name.
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!
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! MAIN
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PROGRAM bdata
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DOUBLE PRECISION doub1, doub2
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CHARACTER*6 char1, char2
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COMMON /BLK1/ doub1, char1
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COMMON /BLK2/ doub2, char2
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doub1 = 11.111
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doub2 = 22.222
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char1 = 'ABCDEF'
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char2 = 'GHIJKL'
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CALL sub_block_data ! BP_BEFORE_SUB
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STOP
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END
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! BLOCK DATA
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BLOCK DATA
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DOUBLE PRECISION doub1, doub2
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CHARACTER*6 char1, char2
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COMMON /BLK1/ doub1, char1
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COMMON /BLK2/ doub2, char2
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DATA doub1, doub2 /1.111, 2.222/
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DATA char1, char2 /'abcdef', 'ghijkl'/
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END
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! SUBROUTINE
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SUBROUTINE sub_block_data
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DOUBLE PRECISION doub1, doub2
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CHARACTER*6 char1, char2
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COMMON /BLK1/ doub1, char1
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COMMON /BLK2/ doub2, char2
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char1 = char2; ! BP_SUB
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END
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