diff options
Diffstat (limited to 'gdb/testsuite/gdb.dwarf2/dw2-is-stmt-2.c')
| -rw-r--r-- | gdb/testsuite/gdb.dwarf2/dw2-is-stmt-2.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/gdb/testsuite/gdb.dwarf2/dw2-is-stmt-2.c b/gdb/testsuite/gdb.dwarf2/dw2-is-stmt-2.c new file mode 100644 index 0000000..be3fa45 --- /dev/null +++ b/gdb/testsuite/gdb.dwarf2/dw2-is-stmt-2.c @@ -0,0 +1,99 @@ +/* Copyright 2020 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) \ + do \ + { \ + asm ("line_label_" #N ": .globl line_label_" #N); \ + var = (N); \ + bar = ((N) + 1); \ + } \ + while (0) + +volatile int var; +volatile int bar; + +int +main () +{ /* main prologue */ + asm ("main_label: .globl main_label"); + + /* main start */ + + /* Line 1. */ + /* Line 2. */ + /* Line 3. */ + /* Line 4. */ + /* Line 5. */ + + LL (0); + LL (1); + LL (2); + LL (3); + LL (4); + LL (5); + LL (6); + LL (7); + LL (8); + LL (9); + LL (10); + LL (11); + LL (12); + LL (13); + LL (14); + LL (15); + LL (16); + return 0; /* main end */ +} + +#if 0 + +PROLOGUE* +1: L1 +2: L1* +3: L2 +4: L1 +L3 +L4 +L4* +L2* +L2 +L3 +L5 +L5* +L3 +L4 +L5 +RETURN + +#endif |