| /* Copyright 2020-2021 Free Software Foundation, Inc. |
| |
| 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 tests GDB's handling of the DWARF is-stmt field in the line table. |
| |
| This field is used when many addresses all represent the same source |
| line. The address(es) at which it is suitable to place a breakpoint for |
| a line are marked with is-stmt true, while address(es) that are not good |
| places to place a breakpoint are marked as is-stmt false. |
| |
| In order to build a reproducible test and exercise GDB's is-stmt |
| support, we will be generating our own DWARF. The test will contain a |
| series of C source lines, ensuring that we get a series of assembler |
| instructions. Each C source line will be given an assembler label, |
| which we use to generate a fake line table. |
| |
| In this fake line table each assembler block is claimed to represent a |
| single C source line, however, we will toggle the is-stmt flag. We can |
| then debug this with GDB and test the handling of is-stmt. */ |
| |
| /* Used to insert labels with which we can build a fake line table. */ |
| #define LL(N) asm ("line_label_" #N ": .globl line_label_" #N) |
| |
| volatile int var; |
| volatile int bar; |
| |
| int |
| main () |
| { /* main prologue */ |
| asm ("main_label: .globl main_label"); |
| LL (1); |
| var = 99; /* main, set var to 99 */ |
| bar = 99; |
| |
| LL (2); |
| var = 0; /* main, set var to 0 */ |
| bar = 0; |
| |
| LL (3); |
| var = 1; /* main, set var to 1 */ |
| bar = 1; |
| |
| LL (4); |
| var = 2; /* main, set var to 2 */ |
| bar = 2; |
| |
| LL (5); |
| return 0; /* main end */ |
| } |