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* [Bug cli/30320] New: [gdb/cli] lines_per_page not reset on "set height 0"
@ 2023-04-06 7:50 vries at gcc dot gnu.org
2023-04-06 8:07 ` [Bug cli/30320] " vries at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: vries at gcc dot gnu.org @ 2023-04-06 7:50 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=30320
Bug ID: 30320
Summary: [gdb/cli] lines_per_page not reset on "set height 0"
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: cli
Assignee: unassigned at sourceware dot org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
I tested the following change:
...
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index bb4bd656471..a29fde6a7f4 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -216,8 +216,8 @@ if ![info exists INTERNAL_GDBFLAGS] {
[join [list \
"-nw" \
"-nx" \
- {-iex "set height 0"} \
- {-iex "set width 0"}]]
+ {-eiex "set height 0"} \
+ {-eiex "set width 0"}]]
# If DEBUGINFOD_URLS is set, gdb will try to download sources and
# debug info for f.i. system libraries. Prevent this.
...
and I ran into only one regression:
...
FAIL: gdb.base/paginate-execution-startup.exp: return: send \n to GDB
...
The passing case looks like this:
...
builtin_spawn /data/vries/gdb/leap-15-4/build/gdb/testsuite/../../gdb/gdb -nw
-nx -iex set height 0 -iex set width 0 -data-directory
/data/vries/gdb/leap-15-4/build/gdb/data-directory -ex set height 2 -ex start
--args
/data/vries/gdb/leap-15-4/build/gdb/testsuite/outputs/gdb.base/paginate-execution-startup/paginate-execution-startup^M
GNU gdb (GDB) 14.0.50.20230405-git^M
Copyright (C) 2023 Free Software Foundation, Inc.^M
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>^M
This is free software: you are free to change and redistribute it.^M
There is NO WARRANTY, to the extent permitted by law.^M
Type "show copying" and "show warranty" for details.^M
This GDB was configured as "x86_64-pc-linux-gnu".^M
Type "show configuration" for configuration details.^M
For bug reporting instructions, please see:^M
<https://www.gnu.org/software/gdb/bugs/>.^M
Find the GDB manual and other documentation resources online at:^M
<http://www.gnu.org/software/gdb/documentation/>.^M
^M
For help, type "help".^M
Type "apropos word" to search for commands related to "word"...^M
Reading symbols from
/data/vries/gdb/leap-15-4/build/gdb/testsuite/outputs/gdb.base/paginate-execution-startup/paginate-execution-startup...^M
--Type <RET> for more, q to quit, c to continue without paging--PASS:
gdb.base/paginate-execution-startup.exp: return: run to pagination
^M
Temporary breakpoint 1 at 0x400512: file
/data/vries/gdb/src/gdb/testsuite/gdb.base/paginate-execution-startup.c, line
29.^M
--Type <RET> for more, q to quit, c to continue without paging--^M
Starting program:
/data/vries/gdb/leap-15-4/build/gdb/testsuite/outputs/gdb.base/paginate-execution-startup/paginate-execution-startup
^M
^M
Temporary breakpoint 1, main () at
/data/vries/gdb/src/gdb/testsuite/gdb.base/paginate-execution-startup.c:29^M
29 sleep (3);^M
(gdb) PASS: gdb.base/paginate-execution-startup.exp: return: send \n to GDB
...
And the failing case looks like this:
...
builtin_spawn /data/vries/gdb/leap-15-4/build/gdb/testsuite/../../gdb/gdb -nw
-nx -eiex set height 0 -eiex set width 0 -data-directory
/data/vries/gdb/leap-15-4/build/gdb/data-directory -ex set height 2 -ex start
--args
/data/vries/gdb/leap-15-4/build/gdb/testsuite/outputs/gdb.base/paginate-execution-startup/paginate-execution-startup^M
GNU gdb (GDB) 14.0.50.20230405-git^M
Copyright (C) 2023 Free Software Foundation, Inc.^M
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>^M
This is free software: you are free to change and redistribute it.^M
There is NO WARRANTY, to the extent permitted by law.^M
Type "show copying" and "show warranty" for details.^M
This GDB was configured as "x86_64-pc-linux-gnu".^M
Type "show configuration" for configuration details.^M
For bug reporting instructions, please see:^M
<https://www.gnu.org/software/gdb/bugs/>.^M
Find the GDB manual and other documentation resources online at:^M
<http://www.gnu.org/software/gdb/documentation/>.^M
^M
For help, type "help".^M
Type "apropos word" to search for commands related to "word"...^M
Reading symbols from
/data/vries/gdb/leap-15-4/build/gdb/testsuite/outputs/gdb.base/paginate-execution-startup/paginate-execution-startup...^M
Temporary breakpoint 1 at 0x400512: file
/data/vries/gdb/src/gdb/testsuite/gdb.base/paginate-execution-startup.c, line
29.^M
--Type <RET> for more, q to quit, c to continue without paging--PASS:
gdb.base/paginate-execution-startup.exp: return: run to pagination
^M
Starting program:
/data/vries/gdb/leap-15-4/build/gdb/testsuite/outputs/gdb.base/paginate-execution-startup/paginate-execution-startup
^M
^M
Temporary breakpoint 1, main () at
/data/vries/gdb/src/gdb/testsuite/gdb.base/paginate-execution-startup.c:29^M
29 sleep (3);^M
(gdb) FAIL: gdb.base/paginate-execution-startup.exp: return: send \n to GDB
...
On obvious difference is in the amount of pagination prompts: 2 vs 1.
Looking in more detail, the first pagination prompt is in different locations.
Let's track pagination in both scenarios using watch lines_per_page and
printed_lines.
First (passing, 2 pagination prompts):
- lines_per_page 0 -> 21
- lines_printed 0 -> 1 -> ... -> 15
- lines_per_page 21 -> 4294967295
- lines_per_page 4294967295 -> 2
- lines_printed 15 -> 0 (due to subsequent pagination prompt)
- pagination prompt, press enter
- lines_printed 0 -> 1
- lines_printed 1 -> 0 (due to subsequent pagination prompt)
- pagination prompt, press enter
- lines_printed 0 -> 1 -> 2 -> 3 -> 4
Second (failing, 1 pagination prompt):
- lines_per_page 0 -> 21
- lines_per_page 21 -> 4294967295
- lines_per_page 4294967295 -> 2
- lines_printed 0 -> 1
- lines_printed 1 -> 0 (due to subsequent pagination prompt)
- pagination prompt, press enter
- lines_printed 0 -> 1 -> 2 -> 3 -> 4
It seems odd to me that we don't reset lines_printed to 0 when doing "set
height 0", in other words, setting pagination to "off".
In other words, I wonder if the failing scenario shows the correct behaviour.
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* [Bug cli/30320] [gdb/cli] lines_per_page not reset on "set height 0"
2023-04-06 7:50 [Bug cli/30320] New: [gdb/cli] lines_per_page not reset on "set height 0" vries at gcc dot gnu.org
@ 2023-04-06 8:07 ` vries at gcc dot gnu.org
2023-04-06 8:12 ` vries at gcc dot gnu.org
2023-04-06 11:35 ` vries at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: vries at gcc dot gnu.org @ 2023-04-06 8:07 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=30320
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 14805
--> https://sourceware.org/bugzilla/attachment.cgi?id=14805&action=edit
tentative patch
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* [Bug cli/30320] [gdb/cli] lines_per_page not reset on "set height 0"
2023-04-06 7:50 [Bug cli/30320] New: [gdb/cli] lines_per_page not reset on "set height 0" vries at gcc dot gnu.org
2023-04-06 8:07 ` [Bug cli/30320] " vries at gcc dot gnu.org
@ 2023-04-06 8:12 ` vries at gcc dot gnu.org
2023-04-06 11:35 ` vries at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: vries at gcc dot gnu.org @ 2023-04-06 8:12 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=30320
--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> - lines_printed 0 -> 1 -> 2 -> 3 -> 4
FTR, I also investigated why we're not getting a pagination prompt here,
despite lines_per_page being set to 2, but that's due to this code in
fetch_inferior_event:
...
/* Temporarily disable pagination. Otherwise, the user would be
given an option to press 'q' to quit, which would cause an early
exit and could leave GDB in a half-baked state. */
scoped_restore save_pagination
= make_scoped_restore (&pagination_enabled, false);
...
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* [Bug cli/30320] [gdb/cli] lines_per_page not reset on "set height 0"
2023-04-06 7:50 [Bug cli/30320] New: [gdb/cli] lines_per_page not reset on "set height 0" vries at gcc dot gnu.org
2023-04-06 8:07 ` [Bug cli/30320] " vries at gcc dot gnu.org
2023-04-06 8:12 ` vries at gcc dot gnu.org
@ 2023-04-06 11:35 ` vries at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: vries at gcc dot gnu.org @ 2023-04-06 11:35 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=30320
--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
https://sourceware.org/pipermail/gdb-patches/2023-April/198651.html
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2023-04-06 7:50 [Bug cli/30320] New: [gdb/cli] lines_per_page not reset on "set height 0" vries at gcc dot gnu.org
2023-04-06 8:07 ` [Bug cli/30320] " vries at gcc dot gnu.org
2023-04-06 8:12 ` vries at gcc dot gnu.org
2023-04-06 11:35 ` vries at gcc dot gnu.org
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