From: Tom de Vries <tdevries@suse.de>
To: gdb-patches@sourceware.org
Subject: Re: [PATCH] [gdb/testsuite] Fix error handling in _dap_read_json
Date: Wed, 21 Feb 2024 14:27:50 +0100 [thread overview]
Message-ID: <a37b732f-ac2a-42d0-9333-a56ed6d79a66@suse.de> (raw)
In-Reply-To: <20240214162231.26969-1-tdevries@suse.de>
On 2/14/24 17:22, Tom de Vries wrote:
> In _dap_read_json we have a gdb_expect with clauses that generate errors:
> ...
> timeout {
> error "timeout reading json header"
> }
> eof {
> error "eof reading json header"
> }
> ...
>
> Proc gdb_expect uses dejagnu's remote_expect, which has some peculiar
> semantics related to errors:
> ...
> # remote_expect works basically the same as standard expect, but it
> # also takes care of getting the file descriptor from the specified
> # host and also calling the timeout/eof/default section if there is an
> # error on the expect call.
> .....
>
> When a timeout triggers, it generates a timeout error, which is reported by
> gdb_expect, after which it runs the timeout/eof/default clauses, which
> generates an eof error, which is reported by runtest.
>
> I think the intention here is to generate just a one error, a timeout error.
>
> Fix this by postponing generating the error until after gdb_expect.
>
Committed.
Thanks,
- Tom
> Tested on x86_64-linux, by:
> - running all the DAP test-cases and observing no regressions, and
> - modifying the gdb.dap/eof.exp test-case to trigger a timeout error, and
> observing only a timeout error.
>
> PR testsuite/31382
> Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31382
> ---
> gdb/testsuite/lib/dap-support.exp | 27 +++++++++++++++++++++++----
> 1 file changed, 23 insertions(+), 4 deletions(-)
>
> diff --git a/gdb/testsuite/lib/dap-support.exp b/gdb/testsuite/lib/dap-support.exp
> index 979dfa2cd73..42c1491e507 100644
> --- a/gdb/testsuite/lib/dap-support.exp
> +++ b/gdb/testsuite/lib/dap-support.exp
> @@ -137,6 +137,8 @@ proc dap_send_request {command {obj {}}} {
> # "last_ton" will be set to the TON form of the result.
> proc _dap_read_json {} {
> set length ""
> + set seen_timeout 0
> + set seen_eof 0
> gdb_expect {
> -re "^Content-Length: (\[0-9\]+)\r\n" {
> set length $expect_out(1,string)
> @@ -150,13 +152,20 @@ proc _dap_read_json {} {
> # Done.
> }
> timeout {
> - error "timeout reading json header"
> + set seen_timeout 1
> }
> eof {
> - error "eof reading json header"
> + set seen_eof 1
> }
> }
>
> + if {$seen_timeout} {
> + error "timeout reading json header"
> + }
> + if {$seen_eof} {
> + error "eof reading json header"
> + }
> +
> if {$length == ""} {
> error "didn't find content-length"
> }
> @@ -166,17 +175,27 @@ proc _dap_read_json {} {
> # Tcl only allows up to 255 characters in a {} expression in a
> # regexp, so we may need to read in chunks.
> set this_len [expr {min ($length, 255)}]
> + set seen_timeout 0
> + set seen_eof 0
> gdb_expect {
> -re "^.{$this_len}" {
> append json $expect_out(0,string)
> }
> timeout {
> - error "timeout reading json body"
> + set seen_timeout 1
> }
> eof {
> - error "eof reading json body"
> + set seen_eof 1
> }
> }
> +
> + if {$seen_timeout} {
> + error "timeout reading json header"
> + }
> + if {$seen_eof} {
> + error "eof reading json header"
> + }
> +
> incr length -$this_len
> }
>
>
> base-commit: b235e90e740aa486e6bbe8243eedf109fed41a5c
prev parent reply other threads:[~2024-02-21 13:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-14 16:22 Tom de Vries
2024-02-21 13:27 ` Tom de Vries [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=a37b732f-ac2a-42d0-9333-a56ed6d79a66@suse.de \
--to=tdevries@suse.de \
--cc=gdb-patches@sourceware.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).