a0c0791577
This commit introduces the idea of loading only part of an array in
order to print it, what I call "limited length" arrays.
The motivation behind this work is to make it possible to print slices
of very large arrays, where very large means bigger than
`max-value-size'.
Consider this GDB session with the current GDB:
(gdb) set max-value-size 100
(gdb) p large_1d_array
value requires 400 bytes, which is more than max-value-size
(gdb) p -elements 10 -- large_1d_array
value requires 400 bytes, which is more than max-value-size
notice that the request to print 10 elements still fails, even though 10
elements should be less than the max-value-size. With a patched version
of GDB:
(gdb) p -elements 10 -- large_1d_array
$1 = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9...}
So now the print has succeeded. It also has loaded `max-value-size'
worth of data into value history, so the recorded value can be accessed
consistently:
(gdb) p -elements 10 -- $1
$2 = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9...}
(gdb) p $1
$3 = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, <unavailable> <repeats 75 times>}
(gdb)
Accesses with other languages work similarly, although for Ada only
C-style [] array element/dimension accesses use history. For both Ada
and Fortran () array element/dimension accesses go straight to the
inferior, bypassing the value history just as with C pointers.
Co-Authored-By: Maciej W. Rozycki <macro@embecosm.com>
48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
/* This testcase is part of GDB, the GNU debugger.
|
|
|
|
Copyright (C) 2023 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/>. */
|
|
|
|
int large_1d_array[] = {
|
|
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
|
|
10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
|
|
20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
|
|
30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
|
|
40, 41, 42, 43, 44, 45, 46, 47, 48, 49,
|
|
50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
|
|
60, 61, 62, 63, 64, 65, 66, 67, 68, 69,
|
|
70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
|
|
80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
|
|
90, 91, 92, 93, 94, 95, 96, 97, 98, 99
|
|
};
|
|
|
|
int large_2d_array[][10] = {
|
|
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
|
|
{10, 11, 12, 13, 14, 15, 16, 17, 18, 19},
|
|
{20, 21, 22, 23, 24, 25, 26, 27, 28, 29},
|
|
{30, 31, 32, 33, 34, 35, 36, 37, 38, 39},
|
|
{40, 41, 42, 43, 44, 45, 46, 47, 48, 49},
|
|
{50, 51, 52, 53, 54, 55, 56, 57, 58, 59},
|
|
{60, 61, 62, 63, 64, 65, 66, 67, 68, 69},
|
|
{70, 71, 72, 73, 74, 75, 76, 77, 78, 79},
|
|
{80, 81, 82, 83, 84, 85, 86, 87, 88, 89},
|
|
{90, 91, 92, 93, 94, 95, 96, 97, 98, 99}
|
|
};
|
|
|
|
int
|
|
main ()
|
|
{
|
|
return 0;
|
|
}
|