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714534e1b8
While investigating PR25862 (an assertion failure with target board
cc-with-debug-names), I noticed that the .debug_aranges section in
gdb.dlang/watch-loc.c contains a hardcoded 0x1000:
...
" .4byte _Dmain \n" // Address
" .4byte 0x1000 \n" // Length
...
Fix this by using the actual length of _Dmain, along the lines of how that
is done in gdb.mi/dw2-ref-missing-frame-func.c:
...
" .4byte _Dmain_end - _Dmain \n" // Length
...
such that the .debug_aranges entry:
...
Address Length
004004a7 0000000b
00000000 00000000
...
matches the addresses found in the corresponding CU:
...
<2><fd>: Abbrev Number: 6 (DW_TAG_subprogram)
<fe> DW_AT_name : _Dmain
<105> DW_AT_low_pc : 0x4004a7
<10d> DW_AT_high_pc : 0x4004b2
...
With this fix the assertion failure is no longer triggered for
gdb.dlang/watch-loc.exp.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2020-04-22 Tom de Vries <tdevries@suse.de>
* gdb.dlang/watch-loc.c (.debug_aranges): Fix _Dmain length.
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* Copyright 2017-2020 Free Software Foundation, Inc.
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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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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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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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/* DWARF will describe these contents as being inside a D module. */
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typedef struct tstruct
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{
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} tstruct;
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tstruct my_data;
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int _Dmain (void)
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{
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asm ("_Dmain_label: .globl _Dmain_label");
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return 0;
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}
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asm ("_Dmain_end: .globl _Dmain_end");
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int
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main (void)
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{
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return _Dmain ();
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}
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/* The .debug_names-based index support depends on .debug_aranges
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generated by GCC. (.gdb_index includes a gdb-generated map
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instead.) */
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asm (
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" .pushsection .debug_info,\"\",%progbits \n"
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".Lcu1_begin:"
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" .popsection \n"
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" .pushsection .debug_aranges,\"\",%progbits \n"
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" .4byte .Laranges_end - .Laranges_start \n" // Length of Address Ranges Info
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".Laranges_start: \n"
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" .2byte 0x2 \n" // DWARF Version
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" .4byte .Lcu1_begin\n" // .Ldebug_info0 - Offset of Compilation Unit Info
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" .byte 4 \n" // Size of Address
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" .byte 0 \n" // Size of Segment Descriptor
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" .2byte 0 \n" // Pad to 16 byte boundary
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" .2byte 0 \n"
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" .4byte _Dmain \n" // Address
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" .4byte _Dmain_end - _Dmain \n" // Length
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" .4byte 0 \n"
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" .4byte 0 \n"
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".Laranges_end: \n"
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" .popsection \n"
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);
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