Comments on: SamplingProfiler 1.7.0 still hot from the compiler

By: Eric

Eric — Fri, 17 Apr 2009 07:54:57 +0000

Paul, I created a thread on FreePascal support and copied the comments there!
http://delphitools.info/forums/index.php?topic=13.0
Should be more convenient to keep track of things.

By: Paul Ishenin

Paul Ishenin — Fri, 17 Apr 2009 07:24:23 +0000

To get map file from FreePascal one need to compile source using -Xm. I never had problems with that.

To get line info you can use next 2 files:
fpc\rtl\inc\lineinfo.pp
fpc\rtl\inc\lnfodwrf.pp

Default debugger format is stubs but it is also possible to compile with dwarf. First file I suppose reads from stabs and the second from dwarf.

Feel free to ask on fpc-pascal/fpc-devel mail list. There fpc devels will answer better about this.

By: Eric

Eric — Thu, 16 Apr 2009 05:36:47 +0000

A while back I tried getting a map file out of FreePascal with no success, IIRC I even asked on the FreePascal (or Lazarus?) forums.
I also had a look at DWARF debug info, but the spec was several hundred pages, so I gave up without trying.
Do you have code available that would parse FreePascal debug info, and provide some minimal functionality, like enumerating the segments, and returning module/unit/procedure/line info from an execution address?

On Linux/OSX, I would guess there are already many profilers that support GDB/DWARF, SamplingProfiler was started to fill a niche (lack of sampling profilers for native Delphi in Windows).

By: Paul Ishenin

Paul Ishenin — Wed, 15 Apr 2009 23:06:29 +0000

Nice. But can look at FreePascal map files? It will be much nicer if your profiler could support them. And btw, if nothing difficult is used in your code it is possible to port your profiler for linux/osx.

If you need some assistance feel free to contact me.

By: K. A.

K. A. — Wed, 15 Apr 2009 19:22:46 +0000

COOL! Thanx a lot…