a5fd13a915
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.
56 lines
1.6 KiB
Fortran
56 lines
1.6 KiB
Fortran
! 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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