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584 lines
21 KiB
EmacsLisp
584 lines
21 KiB
EmacsLisp
;;; elp.el --- Emacs Lisp Profiler
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;; Copyright (C) 1994,1995,1997,1998 Free Software Foundation, Inc.
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;; Author: 1994-1998 Barry A. Warsaw
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;; Maintainer: FSF
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;; Created: 26-Feb-1994
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;; Keywords: debugging lisp tools
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;
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;; If you want to profile a bunch of functions, set elp-function-list
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;; to the list of symbols, then do a M-x elp-instrument-list. This
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;; hacks those functions so that profiling information is recorded
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;; whenever they are called. To print out the current results, use
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;; M-x elp-results. If you want output to go to standard-output
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;; instead of a separate buffer, setq elp-use-standard-output to
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;; non-nil. With elp-reset-after-results set to non-nil, profiling
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;; information will be reset whenever the results are displayed. You
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;; can also reset all profiling info at any time with M-x
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;; elp-reset-all.
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;;
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;; You can also instrument all functions in a package, provided that
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;; the package follows the GNU coding standard of a common textural
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;; prefix. Use M-x elp-instrument-package for this.
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;;
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;; If you want to sort the results, set elp-sort-by-function to some
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;; predicate function. The three most obvious choices are predefined:
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;; elp-sort-by-call-count, elp-sort-by-average-time, and
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;; elp-sort-by-total-time. Also, you can prune from the output, all
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;; functions that have been called fewer than a given number of times
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;; by setting elp-report-limit.
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;;
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;; Elp can instrument byte-compiled functions just as easily as
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;; interpreted functions, but it cannot instrument macros. However,
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;; when you redefine a function (e.g. with eval-defun), you'll need to
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;; re-instrument it with M-x elp-instrument-function. This will also
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;; reset profiling information for that function. Elp can handle
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;; interactive functions (i.e. commands), but of course any time spent
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;; idling for user prompts will show up in the timing results.
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;;
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;; You can also designate a `master' function. Profiling times will
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;; be gathered for instrumented functions only during execution of
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;; this master function. Thus, if you have some defuns like:
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;;
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;; (defun foo () (do-something-time-intensive))
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;; (defun bar () (foo))
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;; (defun baz () (bar) (foo))
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;;
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;; and you want to find out the amount of time spent in bar and foo,
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;; but only during execution of bar, make bar the master. The call of
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;; foo from baz will not add to foo's total timing sums. Use M-x
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;; elp-set-master and M-x elp-unset-master to utilize this feature.
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;; Only one master function can be set at a time.
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;; You can restore any function's original function definition with
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;; elp-restore-function. The other instrument, restore, and reset
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;; functions are provided for symmetry.
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;; Here is a list of variable you can use to customize elp:
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;; elp-function-list
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;; elp-reset-after-results
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;; elp-sort-by-function
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;; elp-report-limit
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;;
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;; Here is a list of the interactive commands you can use:
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;; elp-instrument-function
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;; elp-restore-function
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;; elp-instrument-list
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;; elp-restore-list
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;; elp-instrument-package
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;; elp-restore-all
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;; elp-reset-function
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;; elp-reset-list
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;; elp-reset-all
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;; elp-set-master
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;; elp-unset-master
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;; elp-results
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;; Note that there are plenty of factors that could make the times
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;; reported unreliable, including the accuracy and granularity of your
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;; system clock, and the overhead spent in lisp calculating and
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;; recording the intervals. I figure the latter is pretty constant,
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;; so while the times may not be entirely accurate, I think they'll
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;; give you a good feel for the relative amount of work spent in the
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;; various lisp routines you are profiling. Note further that times
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;; are calculated using wall-clock time, so other system load will
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;; affect accuracy too.
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;;; Background:
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;; This program was inspired by the only two existing Emacs Lisp
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;; profilers that I'm aware of, Boaz Ben-Zvi's profile.el, and Root
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;; Boy Jim's profiler.el. Both were written for Emacs 18 and both were
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;; pretty good first shots at profiling, but I found that they didn't
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;; provide the functionality or interface that I wanted, so I wrote
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;; this. I've tested elp in XEmacs 19 and Emacs 19. There's no point
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;; in even trying to make this work with Emacs 18.
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;; Unlike previous profilers, elp uses Emacs 19's built-in function
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;; current-time to return interval times. This obviates the need for
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;; both an external C program and Emacs processes to communicate with
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;; such a program, and thus simplifies the package as a whole.
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;; TBD:
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;; Make this act like a real profiler, so that it records time spent
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;; in all branches of execution.
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;;; Code:
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;; start of user configuration variables
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;; vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
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(defgroup elp nil
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"Emacs Lisp Profiler"
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:group 'lisp)
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(defcustom elp-function-list nil
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"*List of functions to profile.
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Used by the command `elp-instrument-list'."
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:type '(repeat function)
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:group 'elp)
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(defcustom elp-reset-after-results t
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"*Non-nil means reset all profiling info after results are displayed.
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Results are displayed with the `elp-results' command."
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:type 'boolean
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:group 'elp)
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(defcustom elp-sort-by-function 'elp-sort-by-total-time
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"*Non-nil specifies elp results sorting function.
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These functions are currently available:
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elp-sort-by-call-count -- sort by the highest call count
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elp-sort-by-total-time -- sort by the highest total time
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elp-sort-by-average-time -- sort by the highest average times
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You can write you're own sort function. It should adhere to the
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interface specified by the PRED argument for the `sort' defun. Each
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\"element of LIST\" is really a 4 element vector where element 0 is
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the call count, element 1 is the total time spent in the function,
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element 2 is the average time spent in the function, and element 3 is
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the symbol's name string."
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:type 'function
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:group 'elp)
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(defcustom elp-report-limit 1
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"*Prevents some functions from being displayed in the results buffer.
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If a number, no function that has been called fewer than that number
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of times will be displayed in the output buffer. If nil, all
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functions will be displayed."
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:type '(choice integer
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(const :tag "Show All" nil))
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:group 'elp)
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(defcustom elp-use-standard-output nil
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"*Non-nil says to output to `standard-output' instead of a buffer."
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:type 'boolean
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:group 'elp)
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(defcustom elp-recycle-buffers-p t
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"*Nil says to not recycle the `elp-results-buffer'.
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In other words, a new unique buffer is create every time you run
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\\[elp-results]."
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:type 'boolean
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:group 'elp)
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;; ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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;; end of user configuration variables
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(defvar elp-results-buffer "*ELP Profiling Results*"
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"Buffer name for outputting profiling results.")
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(defconst elp-timer-info-property 'elp-info
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"ELP information property name.")
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(defvar elp-all-instrumented-list nil
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"List of all functions currently being instrumented.")
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(defvar elp-record-p t
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"Controls whether functions should record times or not.
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This variable is set by the master function.")
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(defvar elp-master nil
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"Master function symbol.")
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;;;###autoload
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(defun elp-instrument-function (funsym)
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"Instrument FUNSYM for profiling.
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FUNSYM must be a symbol of a defined function."
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(interactive "aFunction to instrument: ")
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;; restore the function. this is necessary to avoid infinite
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;; recursion of already instrumented functions (i.e. elp-wrapper
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;; calling elp-wrapper ad infinitum). it is better to simply
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;; restore the function than to throw an error. this will work
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;; properly in the face of eval-defun because if the function was
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;; redefined, only the timer info will be nil'd out since
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;; elp-restore-function is smart enough not to trash the new
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;; definition.
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(elp-restore-function funsym)
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(let* ((funguts (symbol-function funsym))
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(infovec (vector 0 0 funguts))
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(newguts '(lambda (&rest args))))
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;; we cannot profile macros
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(and (eq (car-safe funguts) 'macro)
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(error "ELP cannot profile macro: %s" funsym))
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;; TBD: at some point it might be better to load the autoloaded
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;; function instead of throwing an error. if we do this, then we
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;; probably want elp-instrument-package to be updated with the
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;; newly loaded list of functions. i'm not sure it's smart to do
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;; the autoload here, since that could have side effects, and
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;; elp-instrument-function is similar (in my mind) to defun-ish
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;; type functionality (i.e. it shouldn't execute the function).
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(and (eq (car-safe funguts) 'autoload)
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(error "ELP cannot profile autoloaded function: %s" funsym))
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;; put rest of newguts together
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(if (commandp funsym)
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(setq newguts (append newguts '((interactive)))))
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(setq newguts (append newguts (list
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(list 'elp-wrapper
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(list 'quote funsym)
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(list 'and
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'(interactive-p)
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(not (not (commandp funsym))))
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'args))))
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;; to record profiling times, we set the symbol's function
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;; definition so that it runs the elp-wrapper function with the
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;; function symbol as an argument. We place the old function
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;; definition on the info vector.
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;;
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;; The info vector data structure is a 3 element vector. The 0th
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;; element is the call-count, i.e. the total number of times this
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;; function has been entered. This value is bumped up on entry to
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;; the function so that non-local exists are still recorded. TBD:
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;; I haven't tested non-local exits at all, so no guarantees.
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;;
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;; The 1st element is the total amount of time in usecs that have
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;; been spent inside this function. This number is added to on
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;; function exit.
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;;
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;; The 2nd element is the old function definition list. This gets
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;; funcall'd in between start/end time retrievals. I believe that
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;; this lets us profile even byte-compiled functions.
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;; put the info vector on the property list
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(put funsym elp-timer-info-property infovec)
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;; set the symbol's new profiling function definition to run
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;; elp-wrapper
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(fset funsym newguts)
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;; add this function to the instrumentation list
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(or (memq funsym elp-all-instrumented-list)
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(setq elp-all-instrumented-list
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(cons funsym elp-all-instrumented-list)))
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))
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;;;###autoload
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(defun elp-restore-function (funsym)
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"Restore an instrumented function to its original definition.
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Argument FUNSYM is the symbol of a defined function."
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(interactive "aFunction to restore: ")
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(let ((info (get funsym elp-timer-info-property)))
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;; delete the function from the all instrumented list
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(setq elp-all-instrumented-list
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(delq funsym elp-all-instrumented-list))
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;; if the function was the master, reset the master
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(if (eq funsym elp-master)
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(setq elp-master nil
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elp-record-p t))
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;; zap the properties
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(put funsym elp-timer-info-property nil)
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;; restore the original function definition, but if the function
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;; wasn't instrumented do nothing. we do this after the above
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;; because its possible the function got un-instrumented due to
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;; circumstances beyond our control. Also, check to make sure
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;; that the current function symbol points to elp-wrapper. If
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;; not, then the user probably did an eval-defun, or loaded a
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;; byte-compiled version, while the function was instrumented and
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;; we don't want to destroy the new definition. can it ever be
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;; the case that a lisp function can be compiled instrumented?
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(and info
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(functionp funsym)
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(not (byte-code-function-p (symbol-function funsym)))
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(assq 'elp-wrapper (symbol-function funsym))
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(fset funsym (aref info 2)))))
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;;;###autoload
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(defun elp-instrument-list (&optional list)
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"Instrument for profiling, all functions in `elp-function-list'.
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Use optional LIST if provided instead."
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(interactive "PList of functions to instrument: ")
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(let ((list (or list elp-function-list)))
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(mapcar 'elp-instrument-function list)))
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;;;###autoload
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(defun elp-instrument-package (prefix)
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"Instrument for profiling, all functions which start with PREFIX.
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For example, to instrument all ELP functions, do the following:
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\\[elp-instrument-package] RET elp- RET"
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(interactive "sPrefix of package to instrument: ")
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(elp-instrument-list
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(mapcar
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'intern
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(all-completions
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prefix obarray
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(function
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(lambda (sym)
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(and (fboundp sym)
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(not (memq (car-safe (symbol-function sym)) '(autoload macro))))
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))
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))))
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(defun elp-restore-list (&optional list)
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"Restore the original definitions for all functions in `elp-function-list'.
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Use optional LIST if provided instead."
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(interactive "PList of functions to restore: ")
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(let ((list (or list elp-function-list)))
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(mapcar 'elp-restore-function list)))
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(defun elp-restore-all ()
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"Restores the original definitions of all functions being profiled."
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(interactive)
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(elp-restore-list elp-all-instrumented-list))
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(defun elp-reset-function (funsym)
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"Reset the profiling information for FUNSYM."
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(interactive "aFunction to reset: ")
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(let ((info (get funsym elp-timer-info-property)))
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(or info
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(error "%s is not instrumented for profiling." funsym))
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(aset info 0 0) ;reset call counter
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(aset info 1 0.0) ;reset total time
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;; don't muck with aref 2 as that is the old symbol definition
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))
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(defun elp-reset-list (&optional list)
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"Reset the profiling information for all functions in `elp-function-list'.
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Use optional LIST if provided instead."
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(interactive "PList of functions to reset: ")
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(let ((list (or list elp-function-list)))
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(mapcar 'elp-reset-function list)))
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(defun elp-reset-all ()
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"Reset the profiling information for all functions being profiled."
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(interactive)
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(elp-reset-list elp-all-instrumented-list))
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(defun elp-set-master (funsym)
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"Set the master function for profiling."
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(interactive "aMaster function: ")
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;; when there's a master function, recording is turned off by
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;; default
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(setq elp-master funsym
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elp-record-p nil)
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;; make sure master function is instrumented
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(or (memq funsym elp-all-instrumented-list)
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(elp-instrument-function funsym)))
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(defun elp-unset-master ()
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"Unsets the master function."
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(interactive)
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;; when there's no master function, recording is turned on by default.
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(setq elp-master nil
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elp-record-p t))
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(defsubst elp-elapsed-time (start end)
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(+ (* (- (car end) (car start)) 65536.0)
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(- (car (cdr end)) (car (cdr start)))
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(/ (- (car (cdr (cdr end))) (car (cdr (cdr start)))) 1000000.0)))
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(defun elp-wrapper (funsym interactive-p args)
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"This function has been instrumented for profiling by the ELP.
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ELP is the Emacs Lisp Profiler. To restore the function to its
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original definition, use \\[elp-restore-function] or \\[elp-restore-all]."
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;; turn on recording if this is the master function
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(if (and elp-master
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(eq funsym elp-master))
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(setq elp-record-p t))
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;; get info vector and original function symbol
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(let* ((info (get funsym elp-timer-info-property))
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(func (aref info 2))
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result)
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(or func
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(error "%s is not instrumented for profiling." funsym))
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(if (not elp-record-p)
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;; when not recording, just call the original function symbol
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;; and return the results.
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(setq result
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(if interactive-p
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(call-interactively func)
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(apply func args)))
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;; we are recording times
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(let (enter-time exit-time)
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;; increment the call-counter
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(aset info 0 (1+ (aref info 0)))
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;; now call the old symbol function, checking to see if it
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;; should be called interactively. make sure we return the
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;; correct value
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(if interactive-p
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(setq enter-time (current-time)
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result (call-interactively func)
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exit-time (current-time))
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(setq enter-time (current-time)
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result (apply func args)
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exit-time (current-time)))
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;; calculate total time in function
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(aset info 1 (+ (aref info 1) (elp-elapsed-time enter-time exit-time)))
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))
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;; turn off recording if this is the master function
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(if (and elp-master
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(eq funsym elp-master))
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(setq elp-record-p nil))
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result))
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;; shut the byte-compiler up
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(defvar elp-field-len nil)
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(defvar elp-cc-len nil)
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(defvar elp-at-len nil)
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(defvar elp-et-len nil)
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(defun elp-sort-by-call-count (vec1 vec2)
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;; sort by highest call count. See `sort'.
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(>= (aref vec1 0) (aref vec2 0)))
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(defun elp-sort-by-total-time (vec1 vec2)
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;; sort by highest total time spent in function. See `sort'.
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(>= (aref vec1 1) (aref vec2 1)))
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(defun elp-sort-by-average-time (vec1 vec2)
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;; sort by highest average time spent in function. See `sort'.
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(>= (aref vec1 2) (aref vec2 2)))
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(defsubst elp-pack-number (number width)
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;; pack the NUMBER string into WIDTH characters, watching out for
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;; very small or large numbers
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(if (<= (length number) width)
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number
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;; check for very large or small numbers
|
||
(if (string-match "^\\(.*\\)\\(e[+-].*\\)$" number)
|
||
(concat (substring
|
||
(substring number (match-beginning 1) (match-end 1))
|
||
0
|
||
(- width (match-end 2) (- (match-beginning 2)) 3))
|
||
"..."
|
||
(substring number (match-beginning 2) (match-end 2)))
|
||
(concat (substring number 0 width)))))
|
||
|
||
(defun elp-output-result (resultvec)
|
||
;; output the RESULTVEC into the results buffer. RESULTVEC is a 4 or
|
||
;; more element vector where aref 0 is the call count, aref 1 is the
|
||
;; total time spent in the function, aref 2 is the average time
|
||
;; spent in the function, and aref 3 is the symbol's string
|
||
;; name. All other elements in the vector are ignored.
|
||
(let* ((cc (aref resultvec 0))
|
||
(tt (aref resultvec 1))
|
||
(at (aref resultvec 2))
|
||
(symname (aref resultvec 3))
|
||
callcnt totaltime avetime)
|
||
(setq callcnt (number-to-string cc)
|
||
totaltime (number-to-string tt)
|
||
avetime (number-to-string at))
|
||
;; possibly prune the results
|
||
(if (and elp-report-limit
|
||
(numberp elp-report-limit)
|
||
(< cc elp-report-limit))
|
||
nil
|
||
(insert symname)
|
||
(insert-char 32 (+ elp-field-len (- (length symname)) 2))
|
||
;; print stuff out, formatting it nicely
|
||
(insert callcnt)
|
||
(insert-char 32 (+ elp-cc-len (- (length callcnt)) 2))
|
||
(let ((ttstr (elp-pack-number totaltime elp-et-len))
|
||
(atstr (elp-pack-number avetime elp-at-len)))
|
||
(insert ttstr)
|
||
(insert-char 32 (+ elp-et-len (- (length ttstr)) 2))
|
||
(insert atstr))
|
||
(insert "\n"))))
|
||
|
||
;;;###autoload
|
||
(defun elp-results ()
|
||
"Display current profiling results.
|
||
If `elp-reset-after-results' is non-nil, then current profiling
|
||
information for all instrumented functions are reset after results are
|
||
displayed."
|
||
(interactive)
|
||
(let ((curbuf (current-buffer))
|
||
(resultsbuf (if elp-recycle-buffers-p
|
||
(get-buffer-create elp-results-buffer)
|
||
(generate-new-buffer elp-results-buffer))))
|
||
(set-buffer resultsbuf)
|
||
(erase-buffer)
|
||
(beginning-of-buffer)
|
||
;; get the length of the longest function name being profiled
|
||
(let* ((longest 0)
|
||
(title "Function Name")
|
||
(titlelen (length title))
|
||
(elp-field-len titlelen)
|
||
(cc-header "Call Count")
|
||
(elp-cc-len (length cc-header))
|
||
(et-header "Elapsed Time")
|
||
(elp-et-len (length et-header))
|
||
(at-header "Average Time")
|
||
(elp-at-len (length at-header))
|
||
(resvec
|
||
(mapcar
|
||
(function
|
||
(lambda (funsym)
|
||
(let* ((info (get funsym elp-timer-info-property))
|
||
(symname (format "%s" funsym))
|
||
(cc (aref info 0))
|
||
(tt (aref info 1)))
|
||
(if (not info)
|
||
(insert "No profiling information found for: "
|
||
symname)
|
||
(setq longest (max longest (length symname)))
|
||
(vector cc tt (if (zerop cc)
|
||
0.0 ;avoid arithmetic div-by-zero errors
|
||
(/ (float tt) (float cc)))
|
||
symname)))))
|
||
elp-all-instrumented-list))
|
||
) ; end let*
|
||
(insert title)
|
||
(if (> longest titlelen)
|
||
(progn
|
||
(insert-char 32 (- longest titlelen))
|
||
(setq elp-field-len longest)))
|
||
(insert " " cc-header " " et-header " " at-header "\n")
|
||
(insert-char ?= elp-field-len)
|
||
(insert " ")
|
||
(insert-char ?= elp-cc-len)
|
||
(insert " ")
|
||
(insert-char ?= elp-et-len)
|
||
(insert " ")
|
||
(insert-char ?= elp-at-len)
|
||
(insert "\n")
|
||
;; if sorting is enabled, then sort the results list. in either
|
||
;; case, call elp-output-result to output the result in the
|
||
;; buffer
|
||
(if elp-sort-by-function
|
||
(setq resvec (sort resvec elp-sort-by-function)))
|
||
(mapcar 'elp-output-result resvec))
|
||
;; now pop up results buffer
|
||
(set-buffer curbuf)
|
||
(pop-to-buffer resultsbuf)
|
||
;; copy results to standard-output?
|
||
(if (or elp-use-standard-output noninteractive)
|
||
(princ (buffer-substring (point-min) (point-max))))
|
||
;; reset profiling info if desired
|
||
(and elp-reset-after-results
|
||
(elp-reset-all))))
|
||
|
||
(provide 'elp)
|
||
|
||
;; elp.el ends here
|