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213516ef31
This commit is the result of running the gdb/copyright.py script, which automated the update of the copyright year range for all source files managed by the GDB project to be updated to include year 2023.
62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/* Copyright 2020-2023 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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/* This tests GDB's handling of the DWARF is-stmt field in the line table.
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This field is used when many addresses all represent the same source
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line. The address(es) at which it is suitable to place a breakpoint for
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a line are marked with is-stmt true, while address(es) that are not good
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places to place a breakpoint are marked as is-stmt false.
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In order to build a reproducible test and exercise GDB's is-stmt
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support, we will be generating our own DWARF. The test will contain a
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series of C source lines, ensuring that we get a series of assembler
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instructions. Each C source line will be given an assembler label,
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which we use to generate a fake line table.
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In this fake line table each assembler block is claimed to represent a
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single C source line, however, we will toggle the is-stmt flag. We can
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then debug this with GDB and test the handling of is-stmt. */
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/* Used to insert labels with which we can build a fake line table. */
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#define LL(N) asm ("line_label_" #N ": .globl line_label_" #N)
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volatile int var;
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volatile int bar;
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int
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main ()
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{ /* main prologue */
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asm ("main_label: .globl main_label");
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LL (1);
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var = 99; /* main, set var to 99 */
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bar = 99;
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LL (2);
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var = 0; /* main, set var to 0 */
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bar = 0;
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LL (3);
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var = 1; /* main, set var to 1 */
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bar = 1;
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LL (4);
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var = 2; /* main, set var to 2 */
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bar = 2;
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LL (5);
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return 0; /* main end */
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}
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