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590 lines
22 KiB
EmacsLisp
590 lines
22 KiB
EmacsLisp
;;; elp.el --- Emacs Lisp Profiler -*- lexical-binding: t -*-
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;; Copyright (C) 1994-1995, 1997-1998, 2001-2017 Free Software
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;; Foundation, Inc.
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;; Author: Barry A. Warsaw
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;; Maintainer: emacs-devel@gnu.org
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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 3 of the License, or
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;; (at your option) 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. If not, see <http://www.gnu.org/licenses/>.
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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 textual
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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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(eval-when-compile (require 'cl-lib))
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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 your own sort function. It should adhere to the
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interface specified by the PREDICATE argument for `sort'.
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Each \"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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"Prevent 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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"If non-nil, 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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"If nil, don't 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-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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(defvar elp-not-profilable
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;; First, the functions used inside each instrumented function:
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'(called-interactively-p
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;; Then the functions used by the above functions. I used
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;; (delq nil (mapcar (lambda (x) (and (symbolp x) (fboundp x) x))
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;; (aref (symbol-function 'elp-wrapper) 2)))
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;; to help me find this list.
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error call-interactively apply current-time
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;; Andreas Politz reports problems profiling these (Bug#4233):
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+ byte-code-function-p functionp byte-code subrp
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indirect-function fboundp)
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"List of functions that cannot be profiled.
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Those functions are used internally by the profiling code and profiling
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them would thus lead to infinite recursion.")
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(defun elp-profilable-p (fun)
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(and (symbolp fun)
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(fboundp fun)
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(not (or (memq fun elp-not-profilable)
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(keymapp fun)
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(autoloadp (symbol-function fun)) ;FIXME: Why not just load it?
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(special-form-p fun)))))
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(defconst elp--advice-name 'ELP-instrumentation\ )
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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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(let* ((infovec (vector 0 0)))
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;; We cannot profile functions used internally during profiling.
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(unless (elp-profilable-p funsym)
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(error "ELP cannot profile the function: %s" funsym))
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;; The info vector data structure is a 2 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 seconds that has
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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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;; 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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(advice-add funsym :around (elp--make-wrapper funsym)
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`((name . ,elp--advice-name) (depth . -99)))))
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(defun elp--instrumented-p (sym)
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(advice-member-p elp--advice-name sym))
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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
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(list
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(intern
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(completing-read "Function to restore: " obarray
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#'elp--instrumented-p t))))
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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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(advice-remove funsym elp--advice-name))
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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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If called interactively, read LIST using the minibuffer."
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(interactive "PList of functions to instrument: ") ;FIXME: Doesn't work?!
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(unless (listp list)
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(signal 'wrong-type-argument (list 'listp list)))
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(mapcar #'elp-instrument-function (or list elp-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
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(list (completing-read "Prefix of package to instrument: "
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obarray 'elp-profilable-p)))
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(if (zerop (length prefix))
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(error "Instrumenting all Emacs functions would render Emacs unusable"))
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(elp-instrument-list
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(mapcar
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'intern
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(all-completions prefix obarray 'elp-profilable-p))))
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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: ") ;FIXME: Doesn't work!?
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(mapcar #'elp-restore-function (or list elp-function-list)))
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(defun elp-restore-all ()
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"Restore the original definitions of all functions being profiled."
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(interactive)
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(mapatoms #'elp-restore-function))
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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: ") ;FIXME: Doesn't work!?
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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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(mapatoms (lambda (sym)
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(if (get sym elp-timer-info-property)
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(elp-reset-function sym)))))
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(defun elp-set-master (funsym)
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"Set the master function for profiling."
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(interactive
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(list
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(intern
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(completing-read "Master function: " obarray
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#'elp--instrumented-p
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t nil nil (if elp-master (symbol-name elp-master))))))
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;; When there's a master function, recording is turned off by 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 (elp--instrumented-p funsym)
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(elp-instrument-function funsym)))
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(defun elp-unset-master ()
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"Unset 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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(float-time (time-subtract end start)))
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(defun elp--make-wrapper (funsym)
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"Make the piece of advice that instruments FUNSYM."
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(lambda (func &rest 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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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 (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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(cl-incf (aref info 0))
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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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(cl-incf (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
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(if (string-match "^\\(.*\\)\\(e[+-].*\\)$" number)
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(concat (substring
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(match-string 1 number)
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0
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(- width (match-end 2) (- (match-beginning 2)) 3))
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"..."
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(match-string 2 number))
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(substring number 0 width))))
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(defun elp-output-result (resultvec)
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;; output the RESULTVEC into the results buffer. RESULTVEC is a 4 or
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;; more element vector where aref 0 is the call count, aref 1 is the
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;; total time spent in the function, aref 2 is the average time
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;; spent in the function, and aref 3 is the symbol's string
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;; name. All other elements in the vector are ignored.
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(let* ((cc (aref resultvec 0))
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(tt (aref resultvec 1))
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(at (aref resultvec 2))
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(symname (aref resultvec 3))
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callcnt totaltime avetime)
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(setq callcnt (number-to-string cc)
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totaltime (number-to-string tt)
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avetime (number-to-string at))
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;; possibly prune the results
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(if (and elp-report-limit
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(numberp elp-report-limit)
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(< cc elp-report-limit))
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nil
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(elp-output-insert-symname symname)
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(insert-char 32 (+ elp-field-len (- (length symname)) 2))
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;; print stuff out, formatting it nicely
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(insert callcnt)
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(insert-char 32 (+ elp-cc-len (- (length callcnt)) 2))
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(let ((ttstr (elp-pack-number totaltime elp-et-len))
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(atstr (elp-pack-number avetime elp-at-len)))
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(insert ttstr)
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(insert-char 32 (+ elp-et-len (- (length ttstr)) 2))
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(insert atstr))
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(insert "\n"))))
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(defvar elp-results-symname-map
|
||
(let ((map (make-sparse-keymap)))
|
||
(define-key map [mouse-2] 'elp-results-jump-to-definition)
|
||
(define-key map [follow-link] 'mouse-face)
|
||
(define-key map "\C-m" 'elp-results-jump-to-definition)
|
||
map)
|
||
"Keymap used on the function name column." )
|
||
|
||
(defun elp-results-jump-to-definition (&optional event)
|
||
"Jump to the definition of the function under the point."
|
||
(interactive (list last-nonmenu-event))
|
||
(if event (posn-set-point (event-end event)))
|
||
(find-function (get-text-property (point) 'elp-symname)))
|
||
|
||
(defun elp-output-insert-symname (symname)
|
||
;; Insert SYMNAME with text properties.
|
||
(insert (propertize symname
|
||
'elp-symname (intern symname)
|
||
'keymap elp-results-symname-map
|
||
'mouse-face 'highlight
|
||
'face 'link
|
||
'help-echo "mouse-2 or RET jumps to definition")))
|
||
|
||
;;;###autoload
|
||
(defun elp-results ()
|
||
"Display current profiling results.
|
||
If `elp-reset-after-results' is non-nil, then current profiling
|
||
information for all instrumented functions is 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)
|
||
;; 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 '())
|
||
) ; end let*
|
||
(mapatoms
|
||
(lambda (funsym)
|
||
(when (elp--instrumented-p 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)))
|
||
(push
|
||
(vector cc tt (if (zerop cc)
|
||
0.0 ;avoid arithmetic div-by-zero errors
|
||
(/ (float tt) (float cc)))
|
||
symname)
|
||
resvec))))))
|
||
;; If printing to stdout, insert the header so it will print.
|
||
;; Otherwise use header-line-format.
|
||
(setq elp-field-len (max titlelen longest))
|
||
(if (or elp-use-standard-output noninteractive)
|
||
(progn
|
||
(insert title)
|
||
(if (> longest titlelen)
|
||
(progn
|
||
(insert-char 32 (- longest titlelen))))
|
||
(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"))
|
||
(let ((column 0))
|
||
(setq header-line-format
|
||
(mapconcat
|
||
(lambda (title)
|
||
(prog1
|
||
(concat
|
||
(propertize " "
|
||
'display (list 'space :align-to column)
|
||
'face 'fixed-pitch)
|
||
title)
|
||
(setq column (+ column 2
|
||
(if (= column 0)
|
||
elp-field-len
|
||
(length title))))))
|
||
(list title cc-header et-header at-header) ""))))
|
||
;; 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)))
|
||
(mapc '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)))
|
||
(goto-char (point-min)))
|
||
;; reset profiling info if desired
|
||
(and elp-reset-after-results
|
||
(elp-reset-all))))
|
||
|
||
(defun elp-unload-function ()
|
||
"Unload the Emacs Lisp Profiler."
|
||
(elp-restore-all)
|
||
;; continue standard unloading
|
||
nil)
|
||
|
||
(provide 'elp)
|
||
|
||
;;; elp.el ends here
|