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When I run test-case gdb.dwarf2/dw2-abs-hi-pc.exp with gcc, we have:
...
(gdb) break hello^M
Breakpoint 1 at 0x4004c0: file dw2-abs-hi-pc-hello.c, line 24.^M
(gdb) PASS: gdb.dwarf2/dw2-abs-hi-pc.exp: break hello
...
but with clang, I run into:
...
(gdb) break hello^M
Breakpoint 1 at 0x4004e4^M
(gdb) FAIL: gdb.dwarf2/dw2-abs-hi-pc.exp: break hello
...
The problem is that the CU and function both have an empty address range:
...
<0><d2>: Abbrev Number: 1 (DW_TAG_compile_unit)
<108> DW_AT_name : dw2-abs-hi-pc-hello.c
<123> DW_AT_low_pc : 0x4004e0
<127> DW_AT_high_pc : 0x4004e0
<1><12f>: Abbrev Number: 2 (DW_TAG_subprogram)
<131> DW_AT_name : hello
<13a> DW_AT_low_pc : 0x4004e0
<13e> DW_AT_high_pc : 0x4004e0
...
The address ranges are set like this in dw2-abs-hi-pc-hello-dbg.S:
...
.4byte .hello_start /* DW_AT_low_pc */
.4byte .hello_end /* DW_AT_high_pc */
...
where the labels refer to dw2-abs-hi-pc-hello.c:
...
extern int v;
asm (".hello_start: .globl .hello_start\n");
void
hello (void)
{
asm (".hello0: .globl .hello0\n");
v++;
asm (".hello1: .globl .hello1\n");
}
asm (".hello_end: .globl .hello_end\n");
...
Using asm labels in global scope is a known source of problems, as explained
in the comment of proc function_range in gdb/testsuite/lib/dwarf.exp.
Fix this by using function_range instead.
Tested on x86_64-linux with gcc and clang-7 and clang-12.
28 lines
889 B
C
28 lines
889 B
C
/* Copyright 2014-2021 Free Software Foundation, Inc.
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This file is part of GDB.
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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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extern int v;
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void
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world (void)
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{
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asm ("world_label: .globl world_label\n");
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asm (".world0: .globl .world0\n");
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v++;
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asm (".world1: .globl .world1\n");
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}
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