Debugging from Coq toplevel using Caml trace mechanism ====================================================== 1. Launch bytecode version of Coq (coqtop.byte or 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, recompile printers.cma with "make dev/printers.cma" and try again 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.