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Debugging from Coq toplevel using Caml trace mechanism
======================================================
1. Launch bytecode version of Coq (coqtop.byte)
2. Access Ocaml toplevel using vernacular command 'Drop.'
3. Install load paths and pretty printers for terms, idents, ... using
Ocaml command '#use "base_include";;' (use '#use "include";;' for
installing the advanced term pretty printers)
4. Use #trace to tell which function(s) to trace
5. Go back to Coq toplevel with 'go();;'
6. Test your Coq command and observe the result of tracing your functions
7. Freely switch from Coq to Ocaml toplevels with 'Drop.' and 'go();;'
You can avoid typing #use "include" (or "base_include") after Drop
by adding the following lines in your $HOME/.ocamlinit :
if Filename.basename Sys.argv.(0) = "coqtop.byte"
then ignore (Toploop.use_silently Format.std_formatter "include")
Hints: To remove high-level pretty-printing features (coercions,
notations, ...), use "Set Printing All". It will affect the #trace
printers too.
Debugging from Caml debugger
============================
Needs tuareg mode in Emacs
Coq must be configured with -debug and -local (./configure -debug -local)
1. M-x camldebug
2. give the binary name bin/coqtop.byte
3. give ../dev/ocamldebug-coq
4. source db (to get pretty-printers)
5. add breakpoints with C-x C-a C-b from the buffer displaying the ocaml
source
6. get more help from ocamldebug manual
run
step
back
start
next
last
print x (abbreviated into p x)
...
7. some hints:
- To debug a failure/error/anomaly, add a breakpoint in
Vernac.vernac_com at the with clause of the "try ... interp com
with ..." block, then go "back" a few steps to find where the
failure/error/anomaly has been raised
- Alternatively, for an error or an anomaly, add breakpoints in the middle
of each of error* functions or anomaly* functions in lib/util.ml
- If "source db" fails, do a "make printers" and try again (it should build
top_printers.cmo and the core cma files).
Global gprof-based profiling
============================
Coq must be configured with option -profile
1. Run native Coq which must end normally (use Quit or option -batch)
2. gprof ./coqtop gmon.out
Per function profiling
======================
1. To profile function foo in file bar.ml, add the following lines, just
after the definition of the function:
let fookey = Profile.declare_profile "foo";;
let foo a b c = Profile.profile3 fookey foo a b c;;
where foo is assumed to have three arguments (adapt using
Profile.profile1, Profile. profile2, etc).
This has the effect to cumulate the time passed in foo under a
line of name "foo" which is displayed at the time coqtop exits.
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