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| 1 : | anton | 1.1 | \ get some data on potential (partial) inlining |
| 2 : | |||
| 3 : | \ Copyright (C) 2004 Free Software Foundation, Inc. | ||
| 4 : | |||
| 5 : | \ This file is part of Gforth. | ||
| 6 : | |||
| 7 : | \ Gforth is free software; you can redistribute it and/or | ||
| 8 : | \ modify it under the terms of the GNU General Public License | ||
| 9 : | \ as published by the Free Software Foundation; either version 2 | ||
| 10 : | \ of the License, or (at your option) any later version. | ||
| 11 : | |||
| 12 : | \ This program is distributed in the hope that it will be useful, | ||
| 13 : | \ but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 : | \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 15 : | \ GNU General Public License for more details. | ||
| 16 : | |||
| 17 : | \ You should have received a copy of the GNU General Public License | ||
| 18 : | \ along with this program; if not, write to the Free Software | ||
| 19 : | \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | ||
| 20 : | |||
| 21 : | |||
| 22 : | \ relies on some Gforth internals | ||
| 23 : | |||
| 24 : | \ !! assumption: each file is included only once; otherwise you get | ||
| 25 : | \ the counts for just one of the instances of the file. This can be | ||
| 26 : | \ fixed by making sure that every source position occurs only once as | ||
| 27 : | \ a profile point. | ||
| 28 : | |||
| 29 : | true constant count-calls? \ do some profiling of colon definitions etc. | ||
| 30 : | |||
| 31 : | \ for true COUNT-CALLS?: | ||
| 32 : | |||
| 33 : | \ What data do I need for evaluating the effectiveness of (partial) inlining? | ||
| 34 : | |||
| 35 : | \ static and dynamic counts of everything: | ||
| 36 : | |||
| 37 : | \ original BB length (histogram and average) | ||
| 38 : | \ BB length with partial inlining (histogram and average) | ||
| 39 : | \ since we cannot partially inline library calls, we use a parameter | ||
| 40 : | \ that represents the amount of partial inlining we can expect there. | ||
| 41 : | \ number of tail calls (original and after partial inlining) | ||
| 42 : | \ number of calls (original and after partial inlining) | ||
| 43 : | \ reason for BB end: call, return, execute, branch | ||
| 44 : | |||
| 45 : | \ how many static calls are there to a word? How many of the dynamic | ||
| 46 : | \ calls call just a single word? | ||
| 47 : | |||
| 48 : | anton | 1.2 | \ how much does inlining called-once words help? |
| 49 : | \ how much does inlining words without control flow help? | ||
| 50 : | \ how much does partial inlining help? | ||
| 51 : | \ what's the overlap? | ||
| 52 : | \ optimizing return-to-returns (tail calls), return-to-calls, call-to-calls | ||
| 53 : | |||
| 54 : | anton | 1.1 | struct |
| 55 : | anton | 1.2 | cell% list-next |
| 56 : | end-struct list% | ||
| 57 : | |||
| 58 : | list% | ||
| 59 : | anton | 1.1 | cell% 2* field profile-count |
| 60 : | cell% 2* field profile-sourcepos | ||
| 61 : | cell% field profile-char \ character position in line | ||
| 62 : | count-calls? [if] | ||
| 63 : | cell% field profile-colondef? \ is this a colon definition start | ||
| 64 : | anton | 1.2 | cell% field profile-calls \ static calls to the colon def (calls%) |
| 65 : | anton | 1.1 | cell% field profile-straight-line \ may contain calls, but no other CF |
| 66 : | cell% field profile-calls-from \ static calls in the colon def | ||
| 67 : | [endif] | ||
| 68 : | end-struct profile% \ profile point | ||
| 69 : | |||
| 70 : | anton | 1.2 | list% |
| 71 : | cell% field calls%-call \ ptr to profile point of bb containing the call | ||
| 72 : | end-struct calls% | ||
| 73 : | |||
| 74 : | anton | 1.1 | variable profile-points \ linked list of profile% |
| 75 : | 0 profile-points ! | ||
| 76 : | variable next-profile-point-p \ the address where the next pp will be stored | ||
| 77 : | profile-points next-profile-point-p ! | ||
| 78 : | count-calls? [if] | ||
| 79 : | variable last-colondef-profile \ pointer to the pp of last colon definition | ||
| 80 : | [endif] | ||
| 81 : | anton | 1.2 | |
| 82 : | \ list stuff | ||
| 83 : | |||
| 84 : | |||
| 85 : | |||
| 86 : | \ profile-point stuff | ||
| 87 : | |||
| 88 : | anton | 1.1 | : new-profile-point ( -- addr ) |
| 89 : | profile% %alloc >r | ||
| 90 : | 0. r@ profile-count 2! | ||
| 91 : | current-sourcepos r@ profile-sourcepos 2! | ||
| 92 : | >in @ r@ profile-char ! | ||
| 93 : | [ count-calls? ] [if] | ||
| 94 : | r@ profile-colondef? off | ||
| 95 : | 0 r@ profile-calls ! | ||
| 96 : | r@ profile-straight-line on | ||
| 97 : | 0 r@ profile-calls-from ! | ||
| 98 : | [endif] | ||
| 99 : | anton | 1.2 | 0 r@ list-next ! |
| 100 : | anton | 1.1 | r@ next-profile-point-p @ ! |
| 101 : | anton | 1.2 | r@ list-next next-profile-point-p ! |
| 102 : | anton | 1.1 | r> ; |
| 103 : | |||
| 104 : | : print-profile ( -- ) | ||
| 105 : | profile-points @ begin | ||
| 106 : | dup while | ||
| 107 : | dup >r | ||
| 108 : | r@ profile-sourcepos 2@ .sourcepos ." :" | ||
| 109 : | r@ profile-char @ 0 .r ." : " | ||
| 110 : | r@ profile-count 2@ 0 d.r cr | ||
| 111 : | anton | 1.2 | r> list-next @ |
| 112 : | anton | 1.1 | repeat |
| 113 : | drop ; | ||
| 114 : | |||
| 115 : | : print-profile-coldef ( -- ) | ||
| 116 : | profile-points @ begin | ||
| 117 : | dup while | ||
| 118 : | dup >r | ||
| 119 : | r@ profile-colondef? @ if | ||
| 120 : | r@ profile-sourcepos 2@ .sourcepos ." :" | ||
| 121 : | r@ profile-char @ 3 .r ." : " | ||
| 122 : | r@ profile-count 2@ 10 d.r | ||
| 123 : | r@ profile-straight-line @ space 2 .r | ||
| 124 : | r@ profile-calls @ 4 .r | ||
| 125 : | cr | ||
| 126 : | endif | ||
| 127 : | anton | 1.2 | r> list-next @ |
| 128 : | anton | 1.1 | repeat |
| 129 : | drop ; | ||
| 130 : | |||
| 131 : | : dinc ( profilep -- ) | ||
| 132 : | \ increment double pointed to by d-addr | ||
| 133 : | profile-count dup 2@ 1. d+ rot 2! ; | ||
| 134 : | |||
| 135 : | : profile-this ( -- ) | ||
| 136 : | new-profile-point POSTPONE literal POSTPONE dinc ; | ||
| 137 : | |||
| 138 : | \ Various words trigger PROFILE-THIS. In order to avoid getting | ||
| 139 : | \ several calls to PROFILE-THIS from a compiling word (like ?EXIT), we | ||
| 140 : | \ just wait until the next word is parsed by the text interpreter (in | ||
| 141 : | \ compile state) and call PROFILE-THIS only once then. The whole | ||
| 142 : | \ BEFORE-WORD hooking etc. is there for this. | ||
| 143 : | |||
| 144 : | \ The reason that we do this is because we use the source position for | ||
| 145 : | \ the profiling information, and there's only one source position for | ||
| 146 : | \ ?EXIT. If we used the threaded code position instead, we would see | ||
| 147 : | \ that ?EXIT compiles to several threaded-code words, and could use | ||
| 148 : | \ different profile points for them. However, usually dealing with | ||
| 149 : | \ the source is more practical. | ||
| 150 : | |||
| 151 : | \ Another benefit is that we can ask for profiling anywhere in a | ||
| 152 : | \ control-flow word (even before it compiles its own stuff). | ||
| 153 : | |||
| 154 : | \ Potential problem: Consider "COMPILING ] [" where COMPILING compiles | ||
| 155 : | \ a whole colon definition (and triggers our profiler), but during the | ||
| 156 : | \ compilation of the colon definition there is no parsing. Afterwards | ||
| 157 : | \ you get interpret state at first (no profiling, either), but after | ||
| 158 : | \ the "]" you get parsing in compile state, and PROFILE-THIS gets | ||
| 159 : | \ called (and compiles code that is never executed). It would be | ||
| 160 : | \ better if we had a way of knowing whether we are in a colon def or | ||
| 161 : | \ not (and used that knowledge instead of STATE). | ||
| 162 : | |||
| 163 : | Defer before-word-profile ( -- ) | ||
| 164 : | ' noop IS before-word-profile | ||
| 165 : | |||
| 166 : | : before-word1 ( -- ) | ||
| 167 : | before-word-profile defers before-word ; | ||
| 168 : | |||
| 169 : | ' before-word1 IS before-word | ||
| 170 : | |||
| 171 : | : profile-this-compiling ( -- ) | ||
| 172 : | state @ if | ||
| 173 : | profile-this | ||
| 174 : | ['] noop IS before-word-profile | ||
| 175 : | endif ; | ||
| 176 : | |||
| 177 : | : cock-profiler ( -- ) | ||
| 178 : | \ as in cock the gun - pull the trigger | ||
| 179 : | ['] profile-this-compiling IS before-word-profile | ||
| 180 : | [ count-calls? ] [if] \ we are at a non-colondef profile point | ||
| 181 : | last-colondef-profile @ profile-straight-line off | ||
| 182 : | [endif] | ||
| 183 : | ; | ||
| 184 : | |||
| 185 : | : hook-profiling-into ( "name" -- ) | ||
| 186 : | \ make (deferred word) "name" call cock-profiler, too | ||
| 187 : | ' >body >r :noname | ||
| 188 : | POSTPONE cock-profiler | ||
| 189 : | r@ @ compile, \ old hook behaviour | ||
| 190 : | POSTPONE ; | ||
| 191 : | r> ! ; \ change hook behaviour | ||
| 192 : | |||
| 193 : | : note-execute ( -- ) | ||
| 194 : | \ end of BB due to execute | ||
| 195 : | ; | ||
| 196 : | |||
| 197 : | : note-call ( addr -- ) | ||
| 198 : | \ addr is the body address of a called colon def or does handler | ||
| 199 : | dup 3 cells + @ ['] dinc >body = if | ||
| 200 : | 1 over cell+ @ profile-calls +! | ||
| 201 : | endif | ||
| 202 : | drop ; | ||
| 203 : | |||
| 204 : | : prof-compile, ( xt -- ) | ||
| 205 : | dup >does-code if | ||
| 206 : | dup >does-code note-call | ||
| 207 : | then | ||
| 208 : | dup >code-address CASE | ||
| 209 : | docol: OF dup >body note-call ENDOF | ||
| 210 : | dodefer: OF note-execute ENDOF | ||
| 211 : | dofield: OF >body @ ['] lit+ peephole-compile, , EXIT ENDOF | ||
| 212 : | \ dofield: OF >body @ POSTPONE literal ['] + peephole-compile, EXIT ENDOF | ||
| 213 : | \ code words and ;code-defined words (code words could be optimized): | ||
| 214 : | dup in-dictionary? IF drop POSTPONE literal ['] execute peephole-compile, EXIT THEN | ||
| 215 : | ENDCASE | ||
| 216 : | DEFERS compile, ; | ||
| 217 : | |||
| 218 : | \ hook-profiling-into then-like | ||
| 219 : | \ \ hook-profiling-into if-like \ subsumed by other-control-flow | ||
| 220 : | \ \ hook-profiling-into ahead-like \ subsumed by other-control-flow | ||
| 221 : | \ hook-profiling-into other-control-flow | ||
| 222 : | \ hook-profiling-into begin-like | ||
| 223 : | \ hook-profiling-into again-like | ||
| 224 : | \ hook-profiling-into until-like | ||
| 225 : | |||
| 226 : | : :-hook-profile ( -- ) | ||
| 227 : | defers :-hook | ||
| 228 : | next-profile-point-p @ | ||
| 229 : | profile-this | ||
| 230 : | @ dup last-colondef-profile ! | ||
| 231 : | profile-colondef? on ; | ||
| 232 : | |||
| 233 : | ' :-hook-profile IS :-hook | ||
| 234 : | ' prof-compile, IS compile, |
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