[PING][PATCH][gdb/testsuite] Fix check-read1 FAIL in gdb.tui/corefile-run.exp

[Tom de Vries <tdevries at suse dot de>]

On 22-02-2020 21:45, Tom de Vries wrote:
> Hi,
> 
> With test-case gdb.tui/corefile-run.exp and make target check-read1, I run
> into:
> ...
> FAIL: gdb.tui/corefile-run.exp: run until the end
> ...
> 
> In more detail, using -v:
> ...
> PASS: gdb.tui/corefile-run.exp: load corefile
> ^M+++ _ctl_0x0d
> ^[[17d+++ _csi_d <<<17>>>
> ^[[M+++ _csi_M <<<>>>
> ^[[24d+++ _csi_d <<<24>>>
> (INSERT <<(>>
> gINSERT <<g>>
> dINSERT <<d>>
> bINSERT <<b>>
> )INSERT <<)>>
>  INSERT << >>
> FAIL: gdb.tui/corefile-run.exp: run until the end
> ...
> 
> With some debugging code added in wait_for, what happens becomes more clear:
> ...
> 	    if {[regexp -- $wait_for $prev]} {
> +		verbose -log "\nwait_for: MATCHED line ($_cur_y): \"$prev\""
> +		verbose -log "wait_for: AGAINST regexp: \"$wait_for\""
> ...
> 
> In corefile-run.exp, we execute:
> ...
> Term::command "run"
> ...
> and in proc Term::command, we send the command, and then call wait_for:
> ...
>     proc command {cmd} {
>         send_gdb "$cmd\n"
>         wait_for [string_to_regexp $cmd]
>     }
> ...
> which first waits for the command string, and then for the prompt.
> 
> In this case however, the matching of the command string triggers on a
> previous line:
> ...
> wait_for: MATCHED line (16): \
>   "(gdb) core-file corefile-run.core[New LWP 6426] <lots-of-spaces>"
> wait_for: AGAINST regexp: "run"
> ...
> and from there on things go out of sync, eventually resulting in the FAIL.
> 
> Fix this in proc command by more precisely specifying the expected pattern:
> adding a ^$gdb_prompt prefix.
> 
> Add a command_no_prompt_prefix variant to use for initial terminal commands
> where there's no prompt yet.
> 
> Tested gdb.tui/*.exp on x86_64-linux, with make target check and check-read1.
> 
> OK for trunk?
> 

Ping.

Thanks,
- Tom

> [gdb/testsuite] Fix check-read1 FAIL in gdb.tui/corefile-run.exp
> 
> gdb/testsuite/ChangeLog:
> 
> 2020-02-22  Tom de Vries  <tdevries@suse.de>
> 
> 	* lib/tuiterm.exp (Term::command_no_prompt_prefix): New proc.
> 	(Term::command): Use prompt prefix.
> 	(Term::enter_tui): Use command_no_prompt_prefix instead of prefix.
> 	* gdb.tui/tui-layout-asm-short-prog.exp: Use
> 	command_no_prompt_prefix instead of prefix.
> 	* gdb.tui/tui-layout-asm.exp: Same.
> 
> ---
>  gdb/testsuite/gdb.tui/tui-layout-asm-short-prog.exp |  2 +-
>  gdb/testsuite/gdb.tui/tui-layout-asm.exp            |  2 +-
>  gdb/testsuite/lib/tuiterm.exp                       | 13 +++++++++++--
>  3 files changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/gdb/testsuite/gdb.tui/tui-layout-asm-short-prog.exp b/gdb/testsuite/gdb.tui/tui-layout-asm-short-prog.exp
> index d0b871ff76..4aa1ba3046 100644
> --- a/gdb/testsuite/gdb.tui/tui-layout-asm-short-prog.exp
> +++ b/gdb/testsuite/gdb.tui/tui-layout-asm-short-prog.exp
> @@ -32,7 +32,7 @@ if {![Term::prepare_for_tui]} {
>  }
>  
>  # This puts us into TUI mode, and should display the ASM window.
> -Term::command "layout asm"
> +Term::command_no_prompt_prefix "layout asm"
>  Term::check_box_contents "check asm box contents" 0 0 80 15 "<_start>"
>  
>  # Record the first line of output, we'll need this later.
> diff --git a/gdb/testsuite/gdb.tui/tui-layout-asm.exp b/gdb/testsuite/gdb.tui/tui-layout-asm.exp
> index 40f46eaeec..257321fec7 100644
> --- a/gdb/testsuite/gdb.tui/tui-layout-asm.exp
> +++ b/gdb/testsuite/gdb.tui/tui-layout-asm.exp
> @@ -30,7 +30,7 @@ if {![Term::prepare_for_tui]} {
>  }
>  
>  # This puts us into TUI mode, and should display the ASM window.
> -Term::command "layout asm"
> +Term::command_no_prompt_prefix "layout asm"
>  Term::check_box_contents "check asm box contents" 0 0 80 15 "<main>"
>  
>  # Scroll the ASM window down using the down arrow key.  In an ideal
> diff --git a/gdb/testsuite/lib/tuiterm.exp b/gdb/testsuite/lib/tuiterm.exp
> index da5580324a..fea9427ef4 100644
> --- a/gdb/testsuite/lib/tuiterm.exp
> +++ b/gdb/testsuite/lib/tuiterm.exp
> @@ -485,7 +485,7 @@ namespace eval Term {
>  	    return 0
>  	}
>  
> -	command "tui enable"
> +	command_no_prompt_prefix "tui enable"
>  	return 1
>      }
>  
> @@ -493,8 +493,17 @@ namespace eval Term {
>      # seen in the TUI.  CMD should not end with a newline -- that will
>      # be supplied by this function.
>      proc command {cmd} {
> +	global gdb_prompt
> +	send_gdb "$cmd\n"
> +	set str [string_to_regexp $cmd]
> +	set str "^$gdb_prompt $str"
> +	wait_for $str
> +    }
> +
> +    proc command_no_prompt_prefix {cmd} {
>  	send_gdb "$cmd\n"
> -	wait_for [string_to_regexp $cmd]
> +	set str [string_to_regexp $cmd]
> +	wait_for "^$str"
>      }
>  
>      # Return the text of screen line N, without attributes.  Lines are
>