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Hi Martin,<br>
<br>
Thank you for your detailed answers and for pointing me to the
testcases. <br>
<br>
I am having a look at the breakpoint code and will see what I can do
so that debugging works with only a limited number of available
breakpoints.<br>
<br>
One more thing, do you know why ExecuteCommand is defined as
protected and not public in GDBMIDebugger? I need to send some extra
commands to GDB to make the remote connection, using ExecuteCommand
is an elegant way to do this. But the method is invisible in my
class because it is protected. Can the ExecuteCommand methods be
made public or is this a no-go?<br>
<br>
Which GDB version is your prefered version for debugging FreePascal?
<br>
<br>
Thank you again,<br>
<br>
Michael <br>
<br>
On 05/02/2013 22:14, Michael Ring wrote:
<br>
<blockquote type="cite" style="color: #000000;">I have integrated
openocd debugger class as a child of the gdbmi debugger classes,
basic code upload & debugging now works for me in lazarus,
still has some rough edges, this is why I am seeking for support
by the arm-embedded hackers here in fpc-devel.
<br>
</blockquote>
...
<br>
<blockquote type="cite" style="color: #000000;">single stepping
works, I seem to have trouble with creating breakpoints, I run out
of them very fast, for example lazarus shows me 3 breakpoints,
openocd complains that it is already at breakpoint #11, is this a
well known problem or do I need to investigate deeper into this?
<br>
</blockquote>
Hi.
<br>
I don't know much about openocd. But I do know the debugger stuff in
Lazarus.
<br>
<br>
Since you say it is based on the gdbmi classes: There are a number
of breakpoints inserted by GDBMI at startup.
<br>
<br>
First GDBMI runs the exe to the main-entry-point. It does that in
order to then set other breakpoints and do other initialization
(which on some platform depending on gdb and god knows what, can
only succeed <b class="moz-txt-star"><span class="moz-txt-tag">*</span>after<span
class="moz-txt-tag">*</span></b> the initial run).
<br>
a) up to 4 breakpoints (each by name AND address) to stop at main
entry point. find function:
<br>
function RunToMain(EntryPoint: String): integer;
<br>
b) 3 breakpoints in fpc, to catch exception, run-error and some
other
<br>
c) run the program.
<br>
<br>
So that gives the breakpoints you see.
<br>
<br>
This can be moved to a virtual method, if a suitable patch is
supplied.
<br>
<br>
<br>
<blockquote type="cite" style="color: #000000;">
<br>
Also, visibility of variables is not that good, I can see simple
variables in my procedures but more complex variables are usually
invisible. Is this a known problem or is there just some magic I
need to apply in the startup of gdb?
<br>
</blockquote>
Complex variables are read via a great many conditions. Each GDB
reports slightly different, and needs slightly different
"corrections"
<br>
<br>
e.g a class may have to be deferred (Foo^.FField), or even first
typecasted (to the type already detected by GDB via ptype). That is
mostly done in GDBTypeInfo
<br>
<br>
I have run various commands, for various datatypes against a dozen
different GDB (and I keep doing for new releases). Some examples are
in debugger\test\gdb responses\
<br>
<br>
<br>
For "in IDE testing" define (be warned, you can screw the debug
session. Do NOT run or step).
<br>
DBG_WITH_DEBUGGER_DEBUG // adds commandline to "debug output"
window
<br>
DBG_WITH_GDB_WATCHES // Allows watches or eval-window
">gdb_command"
<br>
<br>
<br>
<blockquote type="cite" style="color: #000000;">
<br>
Another issue is that I cannot do the loading of my binary from
within gdb, at the moment I still need to do direct telnet
communication with openocd.
<br>
</blockquote>
Not sure if it helps, there also is a class that started work on
gdbserver / it is in SVN
<br>
<br>
<blockquote type="cite" style="color: #000000;">
<br>
Which library should I use for doing the telnet session? I read on
the freepascal wiki that fcl-net is a little outdated, so which
library should I use, I do not want to introduce additional
dependencies to the lazarus build by including synapse or indy.
<br>
</blockquote>
<br>
If your exe is remote, you need to disable the "pause" functionality
(which is also called if you change breakpoints while running (not
paused). Because it sends a signal to a local process
<br>
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