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88b9d363 | 1 | /* Copyright 2020-2022 Free Software Foundation, Inc. |
8c95582d AB |
2 | |
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. | |
7 | ||
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. | |
12 | ||
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/>. */ | |
15 | ||
16 | /* This tests GDB's handling of the DWARF is-stmt field in the line table. | |
17 | ||
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. | |
22 | ||
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. | |
28 | ||
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. */ | |
32 | ||
33 | /* Used to insert labels with which we can build a fake line table. */ | |
34 | #define LL(N) asm ("line_label_" #N ": .globl line_label_" #N) | |
35 | ||
36 | volatile int var; | |
37 | volatile int bar; | |
38 | ||
39 | int | |
40 | main () | |
41 | { /* main prologue */ | |
42 | asm ("main_label: .globl main_label"); | |
43 | LL (1); | |
44 | var = 99; /* main, set var to 99 */ | |
45 | bar = 99; | |
46 | ||
47 | LL (2); | |
48 | var = 0; /* main, set var to 0 */ | |
49 | bar = 0; | |
50 | ||
51 | LL (3); | |
52 | var = 1; /* main, set var to 1 */ | |
53 | bar = 1; | |
54 | ||
55 | LL (4); | |
56 | var = 2; /* main, set var to 2 */ | |
57 | bar = 2; | |
58 | ||
59 | LL (5); | |
60 | return 0; /* main end */ | |
61 | } |