Re: [PATCH v2 1/7] DWARF: Don't add nameless modules to partial symbol table.

[Simon Marchi <simon.marchi@polymtl.ca>]

Adding Richard to the CC list.  Since you are actually working with 
Fortran, you might have some comments about this series.

Simon

On 2018-11-19 16:38, Pawel Wodkowski wrote:
> From: Bernhard Heckel <bernhard.heckel@intel.com>
> 
> A name for BLOCK DATA in Fortran is optional. If no
> name has been assigned, GDB will crash 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.
> 
> 2016-06-15  Bernhard Heckel  <bernhard.heckel@intel.com>
> 
> gdb/Changelog:
> 	* dwarf2read.c (add_partial_symbol): Skip nameless modules.
> 
> gdb/Testsuite/Changelog:
> 	* gdb.fortran/block-data.f: New.
> 	* gdb.fortran/block-data.exp: New.
> ---
>  gdb/dwarf2read.c                         | 13 ++++---
>  gdb/testsuite/gdb.fortran/block-data.exp | 51 
> ++++++++++++++++++++++++++++
>  gdb/testsuite/gdb.fortran/block-data.f   | 58 
> ++++++++++++++++++++++++++++++++
>  3 files changed, 117 insertions(+), 5 deletions(-)
>  create mode 100644 gdb/testsuite/gdb.fortran/block-data.exp
>  create mode 100644 gdb/testsuite/gdb.fortran/block-data.f
> 
> diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
> index d2a8cd44f9a5..89fd4ae15e80 100644
> --- a/gdb/dwarf2read.c
> +++ b/gdb/dwarf2read.c
> @@ -8995,11 +8995,14 @@ 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, -1,
> -			   &objfile->global_psymbols,
> -			   0, cu->language, objfile);
> +      /* In Fortran 77 there might be a "BLOCK DATA" module available 
> wihout
> +         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 != nullptr,
> +			     MODULE_DOMAIN, LOC_TYPEDEF, -1,
> +			     &objfile->global_psymbols,
> +			     0, cu->language, objfile);
>        break;
>      case DW_TAG_class_type:
>      case DW_TAG_interface_type:
> diff --git a/gdb/testsuite/gdb.fortran/block-data.exp
> b/gdb/testsuite/gdb.fortran/block-data.exp
> new file mode 100644
> index 000000000000..2af250ad3886
> --- /dev/null
> +++ b/gdb/testsuite/gdb.fortran/block-data.exp
> @@ -0,0 +1,51 @@
> +# Copyright 2018 Free Software Foundation, Inc.
> +#
> +# Contributed by Intel Corp. <bernhard.heckel@intel.com>
> +#
> +# 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 
> <http://www.gnu.org/licenses/>.
> +
> +# This test is supposed to test anonymous block-data statement.
> +
> +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
> +}
> +
> +gdb_test "print doub1" "= 1.11\\d+" "print doub1, default values"
> +gdb_test "print doub2" "= 2.22\\d+" "print doub2, default values"
> +gdb_test "print char1" "= 'abcdef'" "print char1, default values"
> +gdb_test "print char2" "= 'ghijkl'" "print char2, default values"
> +
> +gdb_breakpoint [gdb_get_line_number "! BP_BEFORE_SUB"]
> +gdb_continue_to_breakpoint "! BP_BEFORE_SUB" ".*! BP_BEFORE_SUB.*"
> +gdb_test "print doub1" "= 11.11\\d+" "print doub1, before sub"
> +gdb_test "print doub2" "= 22.22\\d+" "print doub2, before sub"
> +gdb_test "print char1" "= 'ABCDEF'" "print char1, before sub"
> +gdb_test "print char2" "= 'GHIJKL'" "print char2, before sub"
> +
> +gdb_breakpoint [gdb_get_line_number "! BP_SUB"]
> +gdb_continue_to_breakpoint "! BP_SUB" ".*! BP_SUB.*"
> +gdb_test "print doub1" "= 11.11\\d+" "print char1, in sub"
> +gdb_test "print doub2" "= 22.22\\d+" "print doub2, in sub"
> +gdb_test "print char1" "= 'ABCDEF'" "print char1, in sub"
> +gdb_test "print char2" "= 'GHIJKL'" "print char2, in sub"
> diff --git a/gdb/testsuite/gdb.fortran/block-data.f
> b/gdb/testsuite/gdb.fortran/block-data.f
> new file mode 100644
> index 000000000000..a28e687ec885
> --- /dev/null
> +++ b/gdb/testsuite/gdb.fortran/block-data.f
> @@ -0,0 +1,58 @@
> +! Copyright 2018 Free Software Foundation, Inc.
> +!
> +! Contributed by Intel Corp. <bernhard.heckel@intel.com>
> +!
> +! 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 
> <http://www.gnu.org/licenses/>.
> +!
> +! Test if GDB can handle block data without 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