src/code/room.lisp

   1 ;;;; heap-grovelling memory usage stuff
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; This software is derived from the CMU CL system, which was
   7 ;;;; written at Carnegie Mellon University and released into the
   8 ;;;; public domain. The software is in the public domain and is
   9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  10 ;;;; files for more information.
  11
  12 (in-package "SB!VM")
  13 \f
  14 ;;;; type format database
  15
  16 (eval-when (:compile-toplevel :load-toplevel :execute)
  17   (def!struct (room-info (:make-load-form-fun just-dump-it-normally))
  18     ;; the name of this type
  19     (name nil :type symbol)
  20     ;; kind of type (how we determine length)
  21     (kind (missing-arg)
  22           :type (member :lowtag :fixed :header :vector
  23                         :string :code :closure :instance))
  24     ;; length if fixed-length, shift amount for element size if :VECTOR
  25     (length nil :type (or fixnum null))))
  26
  27 (eval-when (:compile-toplevel :execute)
  28
  29 (defvar *meta-room-info* (make-array 256 :initial-element nil))
  30
  31 (dolist (obj *primitive-objects*)
  32   (let ((widetag (primitive-object-widetag obj))
  33         (lowtag (primitive-object-lowtag obj))
  34         (name (primitive-object-name obj))
  35         (variable (primitive-object-variable-length-p obj))
  36         (size (primitive-object-size obj)))
  37     (cond
  38      ((not lowtag))
  39      (;; KLUDGE described in dan_b message "Another one for the
  40       ;; collection [bug 108]" (sbcl-devel 2004-01-22)
  41       ;;
  42       ;; In a freshly started SBCL 0.8.7.20ish, (TIME (ROOM T))  causes
  43       ;;   debugger invoked on a SB-INT:BUG in thread 5911:
  44       ;;     failed AVER: "(SAP= CURRENT END)"
  45       ;; [WHN: Similar things happened on one but not the other of my
  46       ;; machines when I just run ROOM a lot in a loop.]
  47       ;;
  48       ;; This appears to be due to my [DB] abuse of the primitive
  49       ;; object macros to define a thread object that shares a lowtag
  50       ;; with fixnums and has no widetag: it looks like the code that
  51       ;; generates *META-ROOM-INFO* infers from this that even fixnums
  52       ;; are thread-sized - probably undesirable.
  53       ;;
  54       ;; This [the fix; the EQL NAME 'THREAD clause here] is more in the
  55       ;; nature of a workaround than a really good fix. I'm not sure
  56       ;; what a really good fix is: I /think/ it's probably to remove
  57       ;; the :LOWTAG option in DEFINE-PRIMITIVE-OBJECT THREAD, then teach
  58       ;; genesis to generate the necessary OBJECT_SLOT_OFFSET macros
  59       ;; for assembly source in the runtime/genesis/*.h files.
  60       (eql name 'thread))
  61      ((not widetag)
  62       (let ((info (make-room-info :name name
  63                                   :kind :lowtag))
  64             (lowtag (symbol-value lowtag)))
  65         (declare (fixnum lowtag))
  66         (dotimes (i 32)
  67           (setf (svref *meta-room-info* (logior lowtag (ash i 3))) info))))
  68      (variable)
  69      (t
  70       (setf (svref *meta-room-info* (symbol-value widetag))
  71             (make-room-info :name name
  72                             :kind :fixed
  73                             :length size))))))
  74
  75 (dolist (code (list #!+sb-unicode complex-character-string-widetag
  76                     complex-base-string-widetag simple-array-widetag
  77                     complex-bit-vector-widetag complex-vector-widetag
  78                     complex-array-widetag complex-vector-nil-widetag))
  79   (setf (svref *meta-room-info* code)
  80         (make-room-info :name 'array-header
  81                         :kind :header)))
  82
  83 (setf (svref *meta-room-info* bignum-widetag)
  84       (make-room-info :name 'bignum
  85                       :kind :header))
  86
  87 (setf (svref *meta-room-info* closure-header-widetag)
  88       (make-room-info :name 'closure
  89                       :kind :closure))
  90
  91 ;; FIXME: This looks rather brittle. Can we get more of these numbers
  92 ;; from somewhere sensible?
  93 (dolist (stuff '((simple-bit-vector-widetag . -3)
  94                  (simple-vector-widetag . #.sb!vm:word-shift)
  95                  (simple-array-unsigned-byte-2-widetag . -2)
  96                  (simple-array-unsigned-byte-4-widetag . -1)
  97                  (simple-array-unsigned-byte-7-widetag . 0)
  98                  (simple-array-unsigned-byte-8-widetag . 0)
  99                  (simple-array-unsigned-byte-15-widetag . 1)
 100                  (simple-array-unsigned-byte-16-widetag . 1)
 101                  (simple-array-unsigned-byte-31-widetag . 2)
 102                  (simple-array-unsigned-byte-32-widetag . 2)
 103                  (simple-array-unsigned-byte-60-widetag . 3)
 104                  (simple-array-unsigned-byte-63-widetag . 3)
 105                  (simple-array-unsigned-byte-64-widetag . 3)
 106                  (simple-array-signed-byte-8-widetag . 0)
 107                  (simple-array-signed-byte-16-widetag . 1)
 108                  (simple-array-unsigned-byte-29-widetag . 2)
 109                  (simple-array-signed-byte-30-widetag . 2)
 110                  (simple-array-signed-byte-32-widetag . 2)
 111                  (simple-array-signed-byte-61-widetag . 3)
 112                  (simple-array-signed-byte-64-widetag . 3)
 113                  (simple-array-single-float-widetag . 2)
 114                  (simple-array-double-float-widetag . 3)
 115                  (simple-array-complex-single-float-widetag . 3)
 116                  (simple-array-complex-double-float-widetag . 4)))
 117   (let* ((name (car stuff))
 118          (size (cdr stuff))
 119          (sname (string name)))
 120     (when (boundp name)
 121       (setf (svref *meta-room-info* (symbol-value name))
 122             (make-room-info :name (intern (subseq sname
 123                                                   0
 124                                                   (mismatch sname "-WIDETAG"
 125                                                             :from-end t)))
 126                             :kind :vector
 127                             :length size)))))
 128
 129 (setf (svref *meta-room-info* simple-base-string-widetag)
 130       (make-room-info :name 'simple-base-string
 131                       :kind :string
 132                       :length 0))
 133
 134 #!+sb-unicode
 135 (setf (svref *meta-room-info* simple-character-string-widetag)
 136       (make-room-info :name 'simple-character-string
 137                       :kind :string
 138                       :length 2))
 139
 140 (setf (svref *meta-room-info* simple-array-nil-widetag)
 141       (make-room-info :name 'simple-array-nil
 142                       :kind :fixed
 143                       :length 2))
 144
 145 (setf (svref *meta-room-info* code-header-widetag)
 146       (make-room-info :name 'code
 147                       :kind :code))
 148
 149 (setf (svref *meta-room-info* instance-header-widetag)
 150       (make-room-info :name 'instance
 151                       :kind :instance))
 152
 153 ) ; EVAL-WHEN
 154
 155 (defparameter *room-info* '#.*meta-room-info*)
 156 (deftype spaces () '(member :static :dynamic :read-only))
 157 \f
 158 ;;;; MAP-ALLOCATED-OBJECTS
 159
 160 ;;; Since they're represented as counts of words, we should never
 161 ;;; need bignums to represent these:
 162 (declaim (type fixnum
 163                *static-space-free-pointer*
 164                *read-only-space-free-pointer*))
 165
 166 (defun space-bounds (space)
 167   (declare (type spaces space))
 168   (ecase space
 169     (:static
 170      (values (int-sap static-space-start)
 171              (int-sap (* *static-space-free-pointer* n-word-bytes))))
 172     (:read-only
 173      (values (int-sap read-only-space-start)
 174              (int-sap (* *read-only-space-free-pointer* n-word-bytes))))
 175     (:dynamic
 176      (values (int-sap (current-dynamic-space-start))
 177              (dynamic-space-free-pointer)))))
 178
 179 ;;; Return the total number of bytes used in SPACE.
 180 (defun space-bytes (space)
 181   (multiple-value-bind (start end) (space-bounds space)
 182     (- (sap-int end) (sap-int start))))
 183
 184 ;;; Round SIZE (in bytes) up to the next dualword boundary. A dualword
 185 ;;; is eight bytes on platforms with 32-bit word size and 16 bytes on
 186 ;;; platforms with 64-bit word size.
 187 #!-sb-fluid (declaim (inline round-to-dualword))
 188 (defun round-to-dualword (size)
 189   (logand (the word (+ size lowtag-mask)) (lognot lowtag-mask)))
 190
 191 ;;; Return the total size of a vector in bytes, including any pad.
 192 #!-sb-fluid (declaim (inline vector-total-size))
 193 (defun vector-total-size (obj info)
 194   (let ((shift (room-info-length info))
 195         (len (+ (length (the (simple-array * (*)) obj))
 196                 (ecase (room-info-kind info)
 197                   (:vector 0)
 198                   (:string 1)))))
 199     (round-to-dualword
 200      (+ (* vector-data-offset n-word-bytes)
 201         (if (minusp shift)
 202             (ash (+ len (1- (ash 1 (- shift))))
 203                  shift)
 204             (ash len shift))))))
 205
 206 ;;; Access to the GENCGC page table for better precision in
 207 ;;; MAP-ALLOCATED-OBJECTS
 208 #!+gencgc
 209 (progn
 210   (define-alien-type (struct page)
 211       (struct page
 212               (start long)
 213               ;; On platforms with small enough GC pages, this field
 214               ;; will be a short. On platforms with larger ones, it'll
 215               ;; be an int.
 216               (bytes-used (unsigned
 217                            #.(if (typep sb!vm:gencgc-page-size
 218                                         '(unsigned-byte 16))
 219                                  16
 220                                  32)))
 221               (flags (unsigned 8))
 222               (gen (signed 8))))
 223   (declaim (inline find-page-index))
 224   (define-alien-routine "find_page_index" long (index long))
 225   (define-alien-variable "page_table" (* (struct page))))
 226
 227 ;;; Iterate over all the objects allocated in SPACE, calling FUN with
 228 ;;; the object, the object's type code, and the object's total size in
 229 ;;; bytes, including any header and padding.
 230 #!-sb-fluid (declaim (maybe-inline map-allocated-objects))
 231 (defun map-allocated-objects (fun space)
 232   (declare (type function fun) (type spaces space))
 233   (without-gcing
 234    (multiple-value-bind (start end) (space-bounds space)
 235      (declare (type system-area-pointer start end))
 236      (declare (optimize (speed 3)))
 237      (let ((current start)
 238            #!+gencgc (skip-tests-until-addr 0))
 239        (labels ((maybe-finish-mapping ()
 240                   (unless (sap< current end)
 241                     (aver (sap= current end))
 242                     (return-from map-allocated-objects)))
 243                 ;; GENCGC doesn't allocate linearly, which means that the
 244                 ;; dynamic space can contain large blocks zeros that get
 245                 ;; accounted as conses in ROOM (and slow down other
 246                 ;; applications of MAP-ALLOCATED-OBJECTS). To fix this
 247                 ;; check the GC page structure for the current address.
 248                 ;; If the page is free or the address is beyond the page-
 249                 ;; internal allocation offset (bytes-used) skip to the
 250                 ;; next page immediately.
 251                 (maybe-skip-page ()
 252                   #!+gencgc
 253                   (when (eq space :dynamic)
 254                     (loop with page-mask = #.(1- sb!vm:gencgc-page-size)
 255                           for addr of-type sb!vm:word = (sap-int current)
 256                           while (>= addr skip-tests-until-addr)
 257                           do
 258                           ;; For some reason binding PAGE with LET
 259                           ;; conses like mad (but gives no compiler notes...)
 260                           ;; Work around the problem with SYMBOL-MACROLET
 261                           ;; instead of trying to figure out the real
 262                           ;; issue. -- JES, 2005-05-17
 263                           (symbol-macrolet
 264                               ((page (deref page-table
 265                                             (find-page-index addr))))
 266                             ;; Don't we have any nicer way to access C struct
 267                             ;; bitfields?
 268                             (let ((alloc-flag (ldb (byte 3 2)
 269                                                    (slot page 'flags)))
 270                                   (bytes-used (slot page 'bytes-used)))
 271                               ;; If the page is not free and the current
 272                               ;; pointer is still below the allocation offset
 273                               ;; of the page
 274                               (when (and (not (zerop alloc-flag))
 275                                          (<= (logand page-mask addr)
 276                                              bytes-used))
 277                                 ;; Don't bother testing again until we
 278                                 ;; get past that allocation offset
 279                                 (setf skip-tests-until-addr
 280                                       (+ (logandc2 addr page-mask) bytes-used))
 281                                 ;; And then continue with the scheduled
 282                                 ;; mapping
 283                                 (return-from maybe-skip-page))
 284                               ;; Move CURRENT to start of next page
 285                               (setf current (int-sap (+ (logandc2 addr page-mask)
 286                                                         sb!vm:gencgc-page-size)))
 287                               (maybe-finish-mapping)))))))
 288          (declare (inline maybe-finish-mapping maybe-skip-page))
 289          (loop
 290              (maybe-finish-mapping)
 291              (maybe-skip-page)
 292            (let* ((header (sap-ref-word current 0))
 293                   (header-widetag (logand header #xFF))
 294                   (info (svref *room-info* header-widetag)))
 295              (cond
 296                ((or (not info)
 297                     (eq (room-info-kind info) :lowtag))
 298                 (let ((size (* cons-size n-word-bytes)))
 299                   (funcall fun
 300                            (%make-lisp-obj (logior (sap-int current)
 301                                                   list-pointer-lowtag))
 302                            list-pointer-lowtag
 303                            size)
 304                   (setq current (sap+ current size))))
 305                ((eql header-widetag closure-header-widetag)
 306                 (let* ((obj (%make-lisp-obj (logior (sap-int current)
 307                                                    fun-pointer-lowtag)))
 308                        (size (round-to-dualword
 309                               (* (the fixnum (1+ (get-closure-length obj)))
 310                                  n-word-bytes))))
 311                   (funcall fun obj header-widetag size)
 312                   (setq current (sap+ current size))))
 313                ((eq (room-info-kind info) :instance)
 314                 (let* ((obj (%make-lisp-obj
 315                              (logior (sap-int current) instance-pointer-lowtag)))
 316                        (size (round-to-dualword
 317                               (* (+ (%instance-length obj) 1) n-word-bytes))))
 318                   (declare (fixnum size))
 319                   (funcall fun obj header-widetag size)
 320                   (aver (zerop (logand size lowtag-mask)))
 321                   (setq current (sap+ current size))))
 322                (t
 323                 (let* ((obj (%make-lisp-obj
 324                              (logior (sap-int current) other-pointer-lowtag)))
 325                        (size (ecase (room-info-kind info)
 326                                (:fixed
 327                                 (aver (or (eql (room-info-length info)
 328                                                (1+ (get-header-data obj)))
 329                                           (floatp obj)
 330                                           (simple-array-nil-p obj)))
 331                                 (round-to-dualword
 332                                  (* (room-info-length info) n-word-bytes)))
 333                                ((:vector :string)
 334                                 (vector-total-size obj info))
 335                                (:header
 336                                 (round-to-dualword
 337                                  (* (1+ (get-header-data obj)) n-word-bytes)))
 338                                (:code
 339                                 (+ (the fixnum
 340                                      (* (get-header-data obj) n-word-bytes))
 341                                    (round-to-dualword
 342                                     (* (the fixnum (%code-code-size obj))
 343                                        n-word-bytes)))))))
 344                   (funcall fun obj header-widetag size)
 345                   (macrolet ((frob ()
 346                                `(progn
 347                                   (aver (zerop (logand size lowtag-mask)))
 348                                   (setq current (sap+ current size)))))
 349                     (etypecase size
 350                       (fixnum (frob))
 351                       (word (frob))))))))))))))
 352
 353 \f
 354 ;;;; MEMORY-USAGE
 355
 356 ;;; Return a list of 3-lists (bytes object type-name) for the objects
 357 ;;; allocated in Space.
 358 (defun type-breakdown (space)
 359   (let ((sizes (make-array 256 :initial-element 0 :element-type '(unsigned-byte #.sb!vm:n-word-bits)))
 360         (counts (make-array 256 :initial-element 0 :element-type '(unsigned-byte #.sb!vm:n-word-bits))))
 361     (map-allocated-objects
 362      (lambda (obj type size)
 363        (declare (word size) (optimize (speed 3)) (ignore obj))
 364        (incf (aref sizes type) size)
 365        (incf (aref counts type)))
 366      space)
 367
 368     (let ((totals (make-hash-table :test 'eq)))
 369       (dotimes (i 256)
 370         (let ((total-count (aref counts i)))
 371           (unless (zerop total-count)
 372             (let* ((total-size (aref sizes i))
 373                    (name (room-info-name (aref *room-info* i)))
 374                    (found (gethash name totals)))
 375               (cond (found
 376                      (incf (first found) total-size)
 377                      (incf (second found) total-count))
 378                     (t
 379                      (setf (gethash name totals)
 380                            (list total-size total-count name))))))))
 381
 382       (collect ((totals-list))
 383         (maphash (lambda (k v)
 384                    (declare (ignore k))
 385                    (totals-list v))
 386                  totals)
 387         (sort (totals-list) #'> :key #'first)))))
 388
 389 ;;; Handle the summary printing for MEMORY-USAGE. Totals is a list of lists
 390 ;;; (space-name . totals-for-space), where totals-for-space is the list
 391 ;;; returned by TYPE-BREAKDOWN.
 392 (defun print-summary (spaces totals)
 393   (let ((summary (make-hash-table :test 'eq)))
 394     (dolist (space-total totals)
 395       (dolist (total (cdr space-total))
 396         (push (cons (car space-total) total)
 397               (gethash (third total) summary))))
 398
 399     (collect ((summary-totals))
 400       (maphash (lambda (k v)
 401                  (declare (ignore k))
 402                  (let ((sum 0))
 403                    (declare (unsigned-byte sum))
 404                    (dolist (space-total v)
 405                      (incf sum (first (cdr space-total))))
 406                    (summary-totals (cons sum v))))
 407                summary)
 408
 409       (format t "~2&Summary of spaces: ~(~{~A ~}~)~%" spaces)
 410       (let ((summary-total-bytes 0)
 411             (summary-total-objects 0))
 412         (declare (unsigned-byte summary-total-bytes summary-total-objects))
 413         (dolist (space-totals
 414                  (mapcar #'cdr (sort (summary-totals) #'> :key #'car)))
 415           (let ((total-objects 0)
 416                 (total-bytes 0)
 417                 name)
 418             (declare (unsigned-byte total-objects total-bytes))
 419             (collect ((spaces))
 420               (dolist (space-total space-totals)
 421                 (let ((total (cdr space-total)))
 422                   (setq name (third total))
 423                   (incf total-bytes (first total))
 424                   (incf total-objects (second total))
 425                   (spaces (cons (car space-total) (first total)))))
 426               (format t "~%~A:~%    ~:D bytes, ~:D object~:P"
 427                       name total-bytes total-objects)
 428               (dolist (space (spaces))
 429                 (format t ", ~W% ~(~A~)"
 430                         (round (* (cdr space) 100) total-bytes)
 431                         (car space)))
 432               (format t ".~%")
 433               (incf summary-total-bytes total-bytes)
 434               (incf summary-total-objects total-objects))))
 435         (format t "~%Summary total:~%    ~:D bytes, ~:D objects.~%"
 436                 summary-total-bytes summary-total-objects)))))
 437
 438 ;;; Report object usage for a single space.
 439 (defun report-space-total (space-total cutoff)
 440   (declare (list space-total) (type (or single-float null) cutoff))
 441   (format t "~2&Breakdown for ~(~A~) space:~%" (car space-total))
 442   (let* ((types (cdr space-total))
 443          (total-bytes (reduce #'+ (mapcar #'first types)))
 444          (total-objects (reduce #'+ (mapcar #'second types)))
 445          (cutoff-point (if cutoff
 446                            (truncate (* (float total-bytes) cutoff))
 447                            0))
 448          (reported-bytes 0)
 449          (reported-objects 0))
 450     (declare (unsigned-byte total-objects total-bytes cutoff-point reported-objects
 451                             reported-bytes))
 452     (loop for (bytes objects name) in types do
 453       (when (<= bytes cutoff-point)
 454         (format t "  ~10:D bytes for ~9:D other object~2:*~P.~%"
 455                 (- total-bytes reported-bytes)
 456                 (- total-objects reported-objects))
 457         (return))
 458       (incf reported-bytes bytes)
 459       (incf reported-objects objects)
 460       (format t "  ~10:D bytes for ~9:D ~(~A~) object~2:*~P.~%"
 461               bytes objects name))
 462     (format t "  ~10:D bytes for ~9:D ~(~A~) object~2:*~P (space total.)~%"
 463             total-bytes total-objects (car space-total))))
 464
 465 ;;; Print information about the heap memory in use. PRINT-SPACES is a
 466 ;;; list of the spaces to print detailed information for.
 467 ;;; COUNT-SPACES is a list of the spaces to scan. For either one, T
 468 ;;; means all spaces (i.e. :STATIC, :DYNAMIC and :READ-ONLY.) If
 469 ;;; PRINT-SUMMARY is true, then summary information will be printed.
 470 ;;; The defaults print only summary information for dynamic space. If
 471 ;;; true, CUTOFF is a fraction of the usage in a report below which
 472 ;;; types will be combined as OTHER.
 473 (defun memory-usage (&key print-spaces (count-spaces '(:dynamic))
 474                           (print-summary t) cutoff)
 475   (declare (type (or single-float null) cutoff))
 476   (let* ((spaces (if (eq count-spaces t)
 477                      '(:static :dynamic :read-only)
 478                      count-spaces))
 479          (totals (mapcar (lambda (space)
 480                            (cons space (type-breakdown space)))
 481                          spaces)))
 482
 483     (dolist (space-total totals)
 484       (when (or (eq print-spaces t)
 485                 (member (car space-total) print-spaces))
 486         (report-space-total space-total cutoff)))
 487
 488     (when print-summary (print-summary spaces totals)))
 489
 490   (values))
 491 \f
 492 ;;; Print info about how much code and no-ops there are in SPACE.
 493 (defun count-no-ops (space)
 494   (declare (type spaces space))
 495   (let ((code-words 0)
 496         (no-ops 0)
 497         (total-bytes 0))
 498     (declare (fixnum code-words no-ops)
 499              (type unsigned-byte total-bytes))
 500     (map-allocated-objects
 501      (lambda (obj type size)
 502        (when (eql type code-header-widetag)
 503          (let ((words (truly-the fixnum (%code-code-size obj)))
 504                (sap (truly-the system-area-pointer
 505                                (%primitive code-instructions obj)))
 506                (size size))
 507            (declare (fixnum size))
 508            (incf total-bytes size)
 509            (incf code-words words)
 510            (dotimes (i words)
 511              (when (zerop (sap-ref-word sap (* i n-word-bytes)))
 512                (incf no-ops))))))
 513      space)
 514
 515     (format t
 516             "~:D code-object bytes, ~:D code words, with ~:D no-ops (~D%).~%"
 517             total-bytes code-words no-ops
 518             (round (* no-ops 100) code-words)))
 519
 520   (values))
 521 \f
 522 (defun descriptor-vs-non-descriptor-storage (&rest spaces)
 523   (let ((descriptor-words 0)
 524         (non-descriptor-headers 0)
 525         (non-descriptor-bytes 0))
 526     (declare (type unsigned-byte descriptor-words non-descriptor-headers
 527                    non-descriptor-bytes))
 528     (dolist (space (or spaces '(:read-only :static :dynamic)))
 529       (declare (inline map-allocated-objects))
 530       (map-allocated-objects
 531        (lambda (obj type size)
 532          (case type
 533            (#.code-header-widetag
 534             (let ((inst-words (truly-the fixnum (%code-code-size obj)))
 535                   (size size))
 536               (declare (type fixnum size inst-words))
 537               (incf non-descriptor-bytes (* inst-words n-word-bytes))
 538               (incf descriptor-words
 539                     (- (truncate size n-word-bytes) inst-words))))
 540            ((#.bignum-widetag
 541              #.single-float-widetag
 542              #.double-float-widetag
 543              #.simple-base-string-widetag
 544              #!+sb-unicode #.simple-character-string-widetag
 545              #.simple-array-nil-widetag
 546              #.simple-bit-vector-widetag
 547              #.simple-array-unsigned-byte-2-widetag
 548              #.simple-array-unsigned-byte-4-widetag
 549              #.simple-array-unsigned-byte-8-widetag
 550              #.simple-array-unsigned-byte-16-widetag
 551              #.simple-array-unsigned-byte-32-widetag
 552              #.simple-array-signed-byte-8-widetag
 553              #.simple-array-signed-byte-16-widetag
 554              ;; #.simple-array-signed-byte-30-widetag
 555              #.simple-array-signed-byte-32-widetag
 556              #.simple-array-single-float-widetag
 557              #.simple-array-double-float-widetag
 558              #.simple-array-complex-single-float-widetag
 559              #.simple-array-complex-double-float-widetag)
 560             (incf non-descriptor-headers)
 561             (incf non-descriptor-bytes (- size n-word-bytes)))
 562            ((#.list-pointer-lowtag
 563              #.instance-pointer-lowtag
 564              #.ratio-widetag
 565              #.complex-widetag
 566              #.simple-array-widetag
 567              #.simple-vector-widetag
 568              #.complex-base-string-widetag
 569              #.complex-vector-nil-widetag
 570              #.complex-bit-vector-widetag
 571              #.complex-vector-widetag
 572              #.complex-array-widetag
 573              #.closure-header-widetag
 574              #.funcallable-instance-header-widetag
 575              #.value-cell-header-widetag
 576              #.symbol-header-widetag
 577              #.sap-widetag
 578              #.weak-pointer-widetag
 579              #.instance-header-widetag)
 580             (incf descriptor-words (truncate (the fixnum size) n-word-bytes)))
 581            (t
 582             (error "bogus widetag: ~W" type))))
 583        space))
 584     (format t "~:D words allocated for descriptor objects.~%"
 585             descriptor-words)
 586     (format t "~:D bytes data/~:D words header for non-descriptor objects.~%"
 587             non-descriptor-bytes non-descriptor-headers)
 588     (values)))
 589 \f
 590 ;;; Print a breakdown by instance type of all the instances allocated
 591 ;;; in SPACE. If TOP-N is true, print only information for the
 592 ;;; TOP-N types with largest usage.
 593 (defun instance-usage (space &key (top-n 15))
 594   (declare (type spaces space) (type (or fixnum null) top-n))
 595   (format t "~2&~@[Top ~W ~]~(~A~) instance types:~%" top-n space)
 596   (let ((totals (make-hash-table :test 'eq))
 597         (total-objects 0)
 598         (total-bytes 0))
 599     (declare (unsigned-byte total-objects total-bytes))
 600     (map-allocated-objects
 601      (lambda (obj type size)
 602        (declare (optimize (speed 3)))
 603        (when (eql type instance-header-widetag)
 604          (incf total-objects)
 605          (let* ((classoid (layout-classoid (%instance-ref obj 0)))
 606                 (found (gethash classoid totals))
 607                 (size size))
 608            (declare (fixnum size))
 609            (incf total-bytes size)
 610            (cond (found
 611                   (incf (the fixnum (car found)))
 612                   (incf (the fixnum (cdr found)) size))
 613                  (t
 614                   (setf (gethash classoid totals) (cons 1 size)))))))
 615      space)
 616
 617     (collect ((totals-list))
 618       (maphash (lambda (classoid what)
 619                  (totals-list (cons (prin1-to-string
 620                                      (classoid-proper-name classoid))
 621                                     what)))
 622                totals)
 623       (let ((sorted (sort (totals-list) #'> :key #'cddr))
 624             (printed-bytes 0)
 625             (printed-objects 0))
 626         (declare (unsigned-byte printed-bytes printed-objects))
 627         (dolist (what (if top-n
 628                           (subseq sorted 0 (min (length sorted) top-n))
 629                           sorted))
 630           (let ((bytes (cddr what))
 631                 (objects (cadr what)))
 632             (incf printed-bytes bytes)
 633             (incf printed-objects objects)
 634             (format t "  ~A: ~:D bytes, ~:D object~:P.~%" (car what)
 635                     bytes objects)))
 636
 637         (let ((residual-objects (- total-objects printed-objects))
 638               (residual-bytes (- total-bytes printed-bytes)))
 639           (unless (zerop residual-objects)
 640             (format t "  Other types: ~:D bytes, ~:D object~:P.~%"
 641                     residual-bytes residual-objects))))
 642
 643       (format t "  ~:(~A~) instance total: ~:D bytes, ~:D object~:P.~%"
 644               space total-bytes total-objects)))
 645
 646   (values))
 647 \f
 648 ;;;; PRINT-ALLOCATED-OBJECTS
 649
 650 (defun print-allocated-objects (space &key (percent 0) (pages 5)
 651                                       type larger smaller count
 652                                       (stream *standard-output*))
 653   (declare (type (integer 0 99) percent) (type index pages)
 654            (type stream stream) (type spaces space)
 655            (type (or index null) type larger smaller count))
 656   (multiple-value-bind (start-sap end-sap) (space-bounds space)
 657     (let* ((space-start (sap-int start-sap))
 658            (space-end (sap-int end-sap))
 659            (space-size (- space-end space-start))
 660            (pagesize (sb!sys:get-page-size))
 661            (start (+ space-start (round (* space-size percent) 100)))
 662            (printed-conses (make-hash-table :test 'eq))
 663            (pages-so-far 0)
 664            (count-so-far 0)
 665            (last-page 0))
 666       (declare (type (unsigned-byte 32) last-page start)
 667                (fixnum pages-so-far count-so-far pagesize))
 668       (labels ((note-conses (x)
 669                  (unless (or (atom x) (gethash x printed-conses))
 670                    (setf (gethash x printed-conses) t)
 671                    (note-conses (car x))
 672                    (note-conses (cdr x)))))
 673         (map-allocated-objects
 674          (lambda (obj obj-type size)
 675            (let ((addr (get-lisp-obj-address obj)))
 676              (when (>= addr start)
 677                (when (if count
 678                          (> count-so-far count)
 679                          (> pages-so-far pages))
 680                  (return-from print-allocated-objects (values)))
 681
 682                (unless count
 683                  (let ((this-page (* (the (values (unsigned-byte 32) t)
 684                                        (truncate addr pagesize))
 685                                      pagesize)))
 686                    (declare (type (unsigned-byte 32) this-page))
 687                    (when (/= this-page last-page)
 688                      (when (< pages-so-far pages)
 689                        ;; FIXME: What is this? (ERROR "Argh..")? or
 690                        ;; a warning? or code that can be removed
 691                        ;; once the system is stable? or what?
 692                        (format stream "~2&**** Page ~W, address ~X:~%"
 693                                pages-so-far addr))
 694                      (setq last-page this-page)
 695                      (incf pages-so-far))))
 696
 697                (when (and (or (not type) (eql obj-type type))
 698                           (or (not smaller) (<= size smaller))
 699                           (or (not larger) (>= size larger)))
 700                  (incf count-so-far)
 701                  (case type
 702                    (#.code-header-widetag
 703                     (let ((dinfo (%code-debug-info obj)))
 704                       (format stream "~&Code object: ~S~%"
 705                               (if dinfo
 706                                   (sb!c::compiled-debug-info-name dinfo)
 707                                   "No debug info."))))
 708                    (#.symbol-header-widetag
 709                     (format stream "~&~S~%" obj))
 710                    (#.list-pointer-lowtag
 711                     (unless (gethash obj printed-conses)
 712                       (note-conses obj)
 713                       (let ((*print-circle* t)
 714                             (*print-level* 5)
 715                             (*print-length* 10))
 716                         (format stream "~&~S~%" obj))))
 717                    (t
 718                     (fresh-line stream)
 719                     (let ((str (write-to-string obj :level 5 :length 10
 720                                                 :pretty nil)))
 721                       (unless (eql type instance-header-widetag)
 722                         (format stream "~S: " (type-of obj)))
 723                       (format stream "~A~%"
 724                               (subseq str 0 (min (length str) 60))))))))))
 725          space))))
 726   (values))
 727 \f
 728 ;;;; LIST-ALLOCATED-OBJECTS, LIST-REFERENCING-OBJECTS
 729
 730 (defvar *ignore-after* nil)
 731
 732 (defun valid-obj (space x)
 733   (or (not (eq space :dynamic))
 734       ;; this test looks bogus if the allocator doesn't work linearly,
 735       ;; which I suspect is the case for GENCGC.  -- CSR, 2004-06-29
 736       (< (get-lisp-obj-address x) (get-lisp-obj-address *ignore-after*))))
 737
 738 (defun maybe-cons (space x stuff)
 739   (if (valid-obj space x)
 740       (cons x stuff)
 741       stuff))
 742
 743 (defun list-allocated-objects (space &key type larger smaller count
 744                                      test)
 745   (declare (type spaces space)
 746            (type (or index null) larger smaller type count)
 747            (type (or function null) test)
 748            (inline map-allocated-objects))
 749   (unless *ignore-after*
 750     (setq *ignore-after* (cons 1 2)))
 751   (collect ((counted 0 1+))
 752     (let ((res ()))
 753       (map-allocated-objects
 754        (lambda (obj obj-type size)
 755          (when (and (or (not type) (eql obj-type type))
 756                     (or (not smaller) (<= size smaller))
 757                     (or (not larger) (>= size larger))
 758                     (or (not test) (funcall test obj)))
 759            (setq res (maybe-cons space obj res))
 760            (when (and count (>= (counted) count))
 761              (return-from list-allocated-objects res))))
 762        space)
 763       res)))
 764
 765 (defun map-referencing-objects (fun space object)
 766   (declare (type spaces space) (inline map-allocated-objects))
 767   (unless *ignore-after*
 768     (setq *ignore-after* (cons 1 2)))
 769   (flet ((maybe-call (fun obj)
 770            (when (valid-obj space obj)
 771              (funcall fun obj))))
 772     (map-allocated-objects
 773      (lambda (obj obj-type size)
 774        (declare (ignore obj-type size))
 775        (typecase obj
 776          (cons
 777           (when (or (eq (car obj) object)
 778                     (eq (cdr obj) object))
 779             (maybe-call fun obj)))
 780          (instance
 781           (dotimes (i (%instance-length obj))
 782             (when (eq (%instance-ref obj i) object)
 783               (maybe-call fun obj)
 784               (return))))
 785          (code-component
 786           (let ((length (get-header-data obj)))
 787             (do ((i code-constants-offset (1+ i)))
 788                 ((= i length))
 789               (when (eq (code-header-ref obj i) object)
 790                 (maybe-call fun obj)
 791                 (return)))))
 792          (simple-vector
 793           (dotimes (i (length obj))
 794             (when (eq (svref obj i) object)
 795               (maybe-call fun obj)
 796               (return))))
 797          (symbol
 798           (when (or (eq (symbol-name obj) object)
 799                     (eq (symbol-package obj) object)
 800                     (eq (symbol-plist obj) object)
 801                     (and (boundp obj)
 802                          (eq (symbol-value obj) object)))
 803             (maybe-call fun obj)))))
 804      space)))
 805
 806 (defun list-referencing-objects (space object)
 807   (collect ((res))
 808     (map-referencing-objects
 809      (lambda (obj) (res obj)) space object)
 810     (res)))