1 /* Copyright 2020 Free Software Foundation, Inc.
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation; either version 3 of the License, or
6 (at your option) any later version.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License
14 along with this program. If not, see <http://www.gnu.org/licenses/>. */
16 /* This tests GDB's handling of the DWARF is-stmt field in the line table.
18 This field is used when many addresses all represent the same source
19 line. The address(es) at which it is suitable to place a breakpoint for
20 a line are marked with is-stmt true, while address(es) that are not good
21 places to place a breakpoint are marked as is-stmt false.
23 In order to build a reproducible test and exercise GDB's is-stmt
24 support, we will be generating our own DWARF. The test will contain a
25 series of C source lines, ensuring that we get a series of assembler
26 instructions. Each C source line will be given an assembler label,
27 which we use to generate a fake line table.
29 In this fake line table each assembler block is claimed to represent a
30 single C source line, however, we will toggle the is-stmt flag. We can
31 then debug this with GDB and test the handling of is-stmt. */
33 /* Used to insert labels with which we can build a fake line table. */
37 asm ("line_label_" #N ": .globl line_label_" #N); \
49 asm ("main_label: .globl main_label");
76 return 0; /* main end */
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