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/* Copyright 2020-2024 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 */
}
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