Dave,
I lean with you and Tom. While running it over the same libpq protocol
would be helpful in some ways, it would have a lot of drawbacks and
would really change the function of libpq. I think a separate debugging
protocol is in order.
Also, as far as bytecode comments go, let's separate them from this
thread. I have a pretty sweet hand-written stack-based VM that
understands PL/SQL, but it's kinda old and written using PCCTS 1.33 (a
recursive descent parser). It has compilation, decompilation, and full
debugging capabilities. Unfortunately, PCCTS is no longer maintained as
Terrence Parr (the originator) has since moved to ANTLR. ANTLR
currently does not generate C code although I have done some starting
work on it (ANTLR currently generates Python, Java, or C++). I don't
suggest we really reuse one of the current VMs as it would require a lot
more support and coordination. Let's take the bytecode discussion off
this thread and move it to another. There is certainly a good and bad
side to using bytecode and I would be glad to discuss it in another thread.
Dave Cramer wrote:
Pavel,
I am in agreement with Tom here, we should use a separate port, and
protocol specifically designed for this.
My understanding is that this protocol would be synchronous, and be
used for transferring state information, variables, etc back and forth
whereas the existing protocol would still be used to transfer data
back and forth
Dave
On 28-Jun-05, at 10:36 AM, Pavel Stehule wrote:
On Tue, 28 Jun 2005, Tom Lane wrote:
Pavel Stehule <[EMAIL PROTECTED]> writes:
What do you think you need for enhanced protocol ?
What I need? Some like synchronous elog(NOTICE,''), which can
return some
user's interaction, if it's possible. I didn't find how I do it with
current set of messages. But my knowleadges of protocol are minimal.
It'd probably be smarter to manage the debugging across a separate
connection, so that you could carry out debugging without requiring
sophisticated support for it inside the client program. If it's
single-connection then it will be essentially impractical to debug
except from a few specialized clients such as pgadmin; which will
make it hard to investigate behaviors that are only seen under load
from a client app.
I don't think it. Debug process halt query process in bouth variants -
remote | protocol. Remote debugging has one advance. I can monitor any
living plpgsql process, but I have to connect to some special port,
and it
can be problem. Protocol debugging can be supported libpq, and all
clients
libpq can debug. But is problem if PostgreSQL support bouth variants?
btw: debuging have to be only for some users,
GRANT DEBUG ON LANGUAGE plpgsql TO ..
For me, is better variant if I can debug plpgsql code in psql console.
Without spec application. I don't speak so spec application don't
have to
exists (from my view, ofcourse).
Maybe:
set debug_mode to true; -- if 't' then func stmt has src
reset function myfce(integer, integer); -- need recompilation
create breakpoint on myfce(integer, integer) line 1;
select myfce(10,10);
dbg> \l .. list current line
\c .. continue
\n .. next stmt
\L .. show src
\s .. show stack
\b .. switch breakpoint
\q .. quit function
select myvar+10 .. any sql expression
variable .. print variable
\c
myfce
-----
10
that's all. Maybe I have big fantasy :).
Regards
Pavel
+ small argument: if psql support debug mode, I don't need leave my
emacs
postgresql mode.
I don't know exactly how to cause such a connection to get set up,
especially remotely. But we should try to think of a way.
regards, tom lane
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