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 (dolist (stuff '((simple-bit-vector-widetag . -3)
  92                  (simple-vector-widetag . 2)
  93                  (simple-array-unsigned-byte-2-widetag . -2)
  94                  (simple-array-unsigned-byte-4-widetag . -1)
  95                  (simple-array-unsigned-byte-7-widetag . 0)
  96                  (simple-array-unsigned-byte-8-widetag . 0)
  97                  (simple-array-unsigned-byte-15-widetag . 1)
  98                  (simple-array-unsigned-byte-16-widetag . 1)
  99                  (simple-array-unsigned-byte-31-widetag . 2)
 100                  (simple-array-unsigned-byte-32-widetag . 2)
 101                  (simple-array-unsigned-byte-60-widetag . 3)
 102                  (simple-array-unsigned-byte-63-widetag . 3)
 103                  (simple-array-unsigned-byte-64-widetag . 3)
 104                  (simple-array-signed-byte-8-widetag . 0)
 105                  (simple-array-signed-byte-16-widetag . 1)
 106                  (simple-array-unsigned-byte-29-widetag . 2)
 107                  (simple-array-signed-byte-30-widetag . 2)
 108                  (simple-array-signed-byte-32-widetag . 2)
 109                  (simple-array-signed-byte-61-widetag . 3)
 110                  (simple-array-signed-byte-64-widetag . 3)
 111                  (simple-array-single-float-widetag . 2)
 112                  (simple-array-double-float-widetag . 3)
 113                  (simple-array-complex-single-float-widetag . 3)
 114                  (simple-array-complex-double-float-widetag . 4)))
 115   (let* ((name (car stuff))
 116          (size (cdr stuff))
 117          (sname (string name)))
 118     (when (boundp name)
 119       (setf (svref *meta-room-info* (symbol-value name))
 120             (make-room-info :name (intern (subseq sname
 121                                                   0
 122                                                   (mismatch sname "-WIDETAG"
 123                                                             :from-end t)))
 124                             :kind :vector
 125                             :length size)))))
 126
 127 (setf (svref *meta-room-info* simple-base-string-widetag)
 128       (make-room-info :name 'simple-base-string
 129                       :kind :string
 130                       :length 0))
 131
 132 #!+sb-unicode
 133 (setf (svref *meta-room-info* simple-character-string-widetag)
 134       (make-room-info :name 'simple-character-string
 135                       :kind :string
 136                       :length 2))
 137
 138 (setf (svref *meta-room-info* simple-array-nil-widetag)
 139       (make-room-info :name 'simple-array-nil
 140                       :kind :fixed
 141                       :length 2))
 142
 143 (setf (svref *meta-room-info* code-header-widetag)
 144       (make-room-info :name 'code
 145                       :kind :code))
 146
 147 (setf (svref *meta-room-info* instance-header-widetag)
 148       (make-room-info :name 'instance
 149                       :kind :instance))
 150
 151 ) ; EVAL-WHEN
 152
 153 (defparameter *room-info* '#.*meta-room-info*)
 154 (deftype spaces () '(member :static :dynamic :read-only))
 155 \f
 156 ;;;; MAP-ALLOCATED-OBJECTS
 157
 158 ;;; Since they're represented as counts of words, we should never
 159 ;;; need bignums to represent these:
 160 (declaim (type fixnum
 161                *static-space-free-pointer*
 162                *read-only-space-free-pointer*))
 163
 164 (defun space-bounds (space)
 165   (declare (type spaces space))
 166   (ecase space
 167     (:static
 168      (values (int-sap static-space-start)
 169              (int-sap (* *static-space-free-pointer* n-word-bytes))))
 170     (:read-only
 171      (values (int-sap read-only-space-start)
 172              (int-sap (* *read-only-space-free-pointer* n-word-bytes))))
 173     (:dynamic
 174      (values (int-sap (current-dynamic-space-start))
 175              (dynamic-space-free-pointer)))))
 176
 177 ;;; Return the total number of bytes used in SPACE.
 178 (defun space-bytes (space)
 179   (multiple-value-bind (start end) (space-bounds space)
 180     (- (sap-int end) (sap-int start))))
 181
 182 ;;; Round SIZE (in bytes) up to the next dualword (eight byte) boundary.
 183 #!-sb-fluid (declaim (inline round-to-dualword))
 184 (defun round-to-dualword (size)
 185   (declare (fixnum size))
 186   (logand (the fixnum (+ size lowtag-mask)) (lognot lowtag-mask)))
 187
 188 ;;; Return the total size of a vector in bytes, including any pad.
 189 #!-sb-fluid (declaim (inline vector-total-size))
 190 (defun vector-total-size (obj info)
 191   (let ((shift (room-info-length info))
 192         (len (+ (length (the (simple-array * (*)) obj))
 193                 (ecase (room-info-kind info)
 194                   (:vector 0)
 195                   (:string 1)))))
 196     (declare (type (integer -3 3) shift))
 197     (round-to-dualword
 198      (+ (* vector-data-offset n-word-bytes)
 199         (the fixnum
 200              (if (minusp shift)
 201                  (ash (the fixnum
 202                            (+ len (the fixnum
 203                                        (1- (the fixnum (ash 1 (- shift)))))))
 204                       shift)
 205                  (ash len shift)))))))
 206
 207 ;;; Iterate over all the objects allocated in SPACE, calling FUN with
 208 ;;; the object, the object's type code, and the object's total size in
 209 ;;; bytes, including any header and padding.
 210 #!-sb-fluid (declaim (maybe-inline map-allocated-objects))
 211 (defun map-allocated-objects (fun space)
 212   (declare (type function fun) (type spaces space))
 213   (without-gcing
 214     (multiple-value-bind (start end) (space-bounds space)
 215       (declare (type system-area-pointer start end))
 216       (declare (optimize (speed 3) (safety 0)))
 217       (let ((current start)
 218             #+nil
 219             (prev nil))
 220         (loop
 221           (let* ((header (sap-ref-word current 0))
 222                  (header-widetag (logand header #xFF))
 223                  (info (svref *room-info* header-widetag)))
 224             (cond
 225              ((or (not info)
 226                   (eq (room-info-kind info) :lowtag))
 227               (let ((size (* cons-size n-word-bytes)))
 228                 (funcall fun
 229                          (make-lisp-obj (logior (sap-int current)
 230                                                 list-pointer-lowtag))
 231                          list-pointer-lowtag
 232                          size)
 233                 (setq current (sap+ current size))))
 234              ((eql header-widetag closure-header-widetag)
 235               (let* ((obj (make-lisp-obj (logior (sap-int current)
 236                                                  fun-pointer-lowtag)))
 237                      (size (round-to-dualword
 238                             (* (the fixnum (1+ (get-closure-length obj)))
 239                                n-word-bytes))))
 240                 (funcall fun obj header-widetag size)
 241                 (setq current (sap+ current size))))
 242              ((eq (room-info-kind info) :instance)
 243               (let* ((obj (make-lisp-obj
 244                            (logior (sap-int current) instance-pointer-lowtag)))
 245                      (size (round-to-dualword
 246                             (* (+ (%instance-length obj) 1) n-word-bytes))))
 247                 (declare (fixnum size))
 248                 (funcall fun obj header-widetag size)
 249                 (aver (zerop (logand size lowtag-mask)))
 250                 #+nil
 251                 (when (> size 200000) (break "implausible size, prev ~S" prev))
 252                 #+nil
 253                 (setq prev current)
 254                 (setq current (sap+ current size))))
 255              (t
 256               (let* ((obj (make-lisp-obj
 257                            (logior (sap-int current) other-pointer-lowtag)))
 258                      (size (ecase (room-info-kind info)
 259                              (:fixed
 260                               (aver (or (eql (room-info-length info)
 261                                                (1+ (get-header-data obj)))
 262                                         (floatp obj)
 263                                         (simple-array-nil-p obj)))
 264                               (round-to-dualword
 265                                (* (room-info-length info) n-word-bytes)))
 266                              ((:vector :string)
 267                               (vector-total-size obj info))
 268                              (:header
 269                               (round-to-dualword
 270                                (* (1+ (get-header-data obj)) n-word-bytes)))
 271                              (:code
 272                               (+ (the fixnum
 273                                       (* (get-header-data obj) n-word-bytes))
 274                                  (round-to-dualword
 275                                   (* (the fixnum (%code-code-size obj))
 276                                      n-word-bytes)))))))
 277                 (declare (fixnum size))
 278                 (funcall fun obj header-widetag size)
 279                 (aver (zerop (logand size lowtag-mask)))
 280                 #+nil
 281                 (when (> size 200000)
 282                   (break "Implausible size, prev ~S" prev))
 283                 #+nil
 284                 (setq prev current)
 285                 (setq current (sap+ current size))))))
 286           (unless (sap< current end)
 287             (aver (sap= current end))
 288             (return)))
 289
 290         #+nil
 291         prev))))
 292 \f
 293 ;;;; MEMORY-USAGE
 294
 295 ;;; Return a list of 3-lists (bytes object type-name) for the objects
 296 ;;; allocated in Space.
 297 (defun type-breakdown (space)
 298   (let ((sizes (make-array 256 :initial-element 0 :element-type 'fixnum))
 299         (counts (make-array 256 :initial-element 0 :element-type 'fixnum)))
 300     (map-allocated-objects
 301      (lambda (obj type size)
 302        (declare (fixnum size) (optimize (speed 3) (safety 0)) (ignore obj))
 303        (incf (aref sizes type) size)
 304        (incf (aref counts type)))
 305      space)
 306
 307     (let ((totals (make-hash-table :test 'eq)))
 308       (dotimes (i 256)
 309         (let ((total-count (aref counts i)))
 310           (unless (zerop total-count)
 311             (let* ((total-size (aref sizes i))
 312                    (name (room-info-name (aref *room-info* i)))
 313                    (found (gethash name totals)))
 314               (cond (found
 315                      (incf (first found) total-size)
 316                      (incf (second found) total-count))
 317                     (t
 318                      (setf (gethash name totals)
 319                            (list total-size total-count name))))))))
 320
 321       (collect ((totals-list))
 322         (maphash (lambda (k v)
 323                    (declare (ignore k))
 324                    (totals-list v))
 325                  totals)
 326         (sort (totals-list) #'> :key #'first)))))
 327
 328 ;;; Handle the summary printing for MEMORY-USAGE. Totals is a list of lists
 329 ;;; (space-name . totals-for-space), where totals-for-space is the list
 330 ;;; returned by TYPE-BREAKDOWN.
 331 (defun print-summary (spaces totals)
 332   (let ((summary (make-hash-table :test 'eq)))
 333     (dolist (space-total totals)
 334       (dolist (total (cdr space-total))
 335         (push (cons (car space-total) total)
 336               (gethash (third total) summary))))
 337
 338     (collect ((summary-totals))
 339       (maphash (lambda (k v)
 340                  (declare (ignore k))
 341                  (let ((sum 0))
 342                    (declare (fixnum sum))
 343                    (dolist (space-total v)
 344                      (incf sum (first (cdr space-total))))
 345                    (summary-totals (cons sum v))))
 346                summary)
 347
 348       (format t "~2&Summary of spaces: ~(~{~A ~}~)~%" spaces)
 349       (let ((summary-total-bytes 0)
 350             (summary-total-objects 0))
 351         (declare (fixnum summary-total-bytes summary-total-objects))
 352         (dolist (space-totals
 353                  (mapcar #'cdr (sort (summary-totals) #'> :key #'car)))
 354           (let ((total-objects 0)
 355                 (total-bytes 0)
 356                 name)
 357             (declare (fixnum total-objects total-bytes))
 358             (collect ((spaces))
 359               (dolist (space-total space-totals)
 360                 (let ((total (cdr space-total)))
 361                   (setq name (third total))
 362                   (incf total-bytes (first total))
 363                   (incf total-objects (second total))
 364                   (spaces (cons (car space-total) (first total)))))
 365               (format t "~%~A:~%    ~:D bytes, ~:D object~:P"
 366                       name total-bytes total-objects)
 367               (dolist (space (spaces))
 368                 (format t ", ~W% ~(~A~)"
 369                         (round (* (cdr space) 100) total-bytes)
 370                         (car space)))
 371               (format t ".~%")
 372               (incf summary-total-bytes total-bytes)
 373               (incf summary-total-objects total-objects))))
 374         (format t "~%Summary total:~%    ~:D bytes, ~:D objects.~%"
 375                 summary-total-bytes summary-total-objects)))))
 376
 377 ;;; Report object usage for a single space.
 378 (defun report-space-total (space-total cutoff)
 379   (declare (list space-total) (type (or single-float null) cutoff))
 380   (format t "~2&Breakdown for ~(~A~) space:~%" (car space-total))
 381   (let* ((types (cdr space-total))
 382          (total-bytes (reduce #'+ (mapcar #'first types)))
 383          (total-objects (reduce #'+ (mapcar #'second types)))
 384          (cutoff-point (if cutoff
 385                            (truncate (* (float total-bytes) cutoff))
 386                            0))
 387          (reported-bytes 0)
 388          (reported-objects 0))
 389     (declare (fixnum total-objects total-bytes cutoff-point reported-objects
 390                      reported-bytes))
 391     (loop for (bytes objects name) in types do
 392       (when (<= bytes cutoff-point)
 393         (format t "  ~10:D bytes for ~9:D other object~2:*~P.~%"
 394                 (- total-bytes reported-bytes)
 395                 (- total-objects reported-objects))
 396         (return))
 397       (incf reported-bytes bytes)
 398       (incf reported-objects objects)
 399       (format t "  ~10:D bytes for ~9:D ~(~A~) object~2:*~P.~%"
 400               bytes objects name))
 401     (format t "  ~10:D bytes for ~9:D ~(~A~) object~2:*~P (space total.)~%"
 402             total-bytes total-objects (car space-total))))
 403
 404 ;;; Print information about the heap memory in use. PRINT-SPACES is a
 405 ;;; list of the spaces to print detailed information for.
 406 ;;; COUNT-SPACES is a list of the spaces to scan. For either one, T
 407 ;;; means all spaces (i.e. :STATIC, :DYNAMIC and :READ-ONLY.) If
 408 ;;; PRINT-SUMMARY is true, then summary information will be printed.
 409 ;;; The defaults print only summary information for dynamic space. If
 410 ;;; true, CUTOFF is a fraction of the usage in a report below which
 411 ;;; types will be combined as OTHER.
 412 (defun memory-usage (&key print-spaces (count-spaces '(:dynamic))
 413                           (print-summary t) cutoff)
 414   (declare (type (or single-float null) cutoff))
 415   (let* ((spaces (if (eq count-spaces t)
 416                      '(:static :dynamic :read-only)
 417                      count-spaces))
 418          (totals (mapcar (lambda (space)
 419                            (cons space (type-breakdown space)))
 420                          spaces)))
 421
 422     (dolist (space-total totals)
 423       (when (or (eq print-spaces t)
 424                 (member (car space-total) print-spaces))
 425         (report-space-total space-total cutoff)))
 426
 427     (when print-summary (print-summary spaces totals)))
 428
 429   (values))
 430 \f
 431 ;;; Print info about how much code and no-ops there are in SPACE.
 432 (defun count-no-ops (space)
 433   (declare (type spaces space))
 434   (let ((code-words 0)
 435         (no-ops 0)
 436         (total-bytes 0))
 437     (declare (fixnum code-words no-ops)
 438              (type unsigned-byte total-bytes))
 439     (map-allocated-objects
 440      (lambda (obj type size)
 441        (declare (fixnum size) (optimize (safety 0)))
 442        (when (eql type code-header-widetag)
 443          (incf total-bytes size)
 444          (let ((words (truly-the fixnum (%code-code-size obj)))
 445                (sap (truly-the system-area-pointer
 446                                (%primitive code-instructions obj))))
 447            (incf code-words words)
 448            (dotimes (i words)
 449              (when (zerop (sap-ref-word sap (* i n-word-bytes)))
 450                (incf no-ops))))))
 451      space)
 452
 453     (format t
 454             "~:D code-object bytes, ~:D code words, with ~:D no-ops (~D%).~%"
 455             total-bytes code-words no-ops
 456             (round (* no-ops 100) code-words)))
 457
 458   (values))
 459 \f
 460 (defun descriptor-vs-non-descriptor-storage (&rest spaces)
 461   (let ((descriptor-words 0)
 462         (non-descriptor-headers 0)
 463         (non-descriptor-bytes 0))
 464     (declare (type unsigned-byte descriptor-words non-descriptor-headers
 465                    non-descriptor-bytes))
 466     (dolist (space (or spaces '(:read-only :static :dynamic)))
 467       (declare (inline map-allocated-objects))
 468       (map-allocated-objects
 469        (lambda (obj type size)
 470          (declare (fixnum size) (optimize (safety 0)))
 471          (case type
 472            (#.code-header-widetag
 473             (let ((inst-words (truly-the fixnum (%code-code-size obj))))
 474               (declare (type fixnum inst-words))
 475               (incf non-descriptor-bytes (* inst-words n-word-bytes))
 476               (incf descriptor-words
 477                     (- (truncate size n-word-bytes) inst-words))))
 478            ((#.bignum-widetag
 479              #.single-float-widetag
 480              #.double-float-widetag
 481              #.simple-base-string-widetag
 482              #!+sb-unicode #.simple-character-string-widetag
 483              #.simple-array-nil-widetag
 484              #.simple-bit-vector-widetag
 485              #.simple-array-unsigned-byte-2-widetag
 486              #.simple-array-unsigned-byte-4-widetag
 487              #.simple-array-unsigned-byte-8-widetag
 488              #.simple-array-unsigned-byte-16-widetag
 489              #.simple-array-unsigned-byte-32-widetag
 490              #.simple-array-signed-byte-8-widetag
 491              #.simple-array-signed-byte-16-widetag
 492              ; #.simple-array-signed-byte-30-widetag
 493              #.simple-array-signed-byte-32-widetag
 494              #.simple-array-single-float-widetag
 495              #.simple-array-double-float-widetag
 496              #.simple-array-complex-single-float-widetag
 497              #.simple-array-complex-double-float-widetag)
 498             (incf non-descriptor-headers)
 499             (incf non-descriptor-bytes (- size n-word-bytes)))
 500            ((#.list-pointer-lowtag
 501              #.instance-pointer-lowtag
 502              #.ratio-widetag
 503              #.complex-widetag
 504              #.simple-array-widetag
 505              #.simple-vector-widetag
 506              #.complex-base-string-widetag
 507              #.complex-vector-nil-widetag
 508              #.complex-bit-vector-widetag
 509              #.complex-vector-widetag
 510              #.complex-array-widetag
 511              #.closure-header-widetag
 512              #.funcallable-instance-header-widetag
 513              #.value-cell-header-widetag
 514              #.symbol-header-widetag
 515              #.sap-widetag
 516              #.weak-pointer-widetag
 517              #.instance-header-widetag)
 518             (incf descriptor-words (truncate size n-word-bytes)))
 519            (t
 520             (error "bogus widetag: ~W" type))))
 521        space))
 522     (format t "~:D words allocated for descriptor objects.~%"
 523             descriptor-words)
 524     (format t "~:D bytes data/~:D words header for non-descriptor objects.~%"
 525             non-descriptor-bytes non-descriptor-headers)
 526     (values)))
 527 \f
 528 ;;; Print a breakdown by instance type of all the instances allocated
 529 ;;; in SPACE. If TOP-N is true, print only information for the
 530 ;;; TOP-N types with largest usage.
 531 (defun instance-usage (space &key (top-n 15))
 532   (declare (type spaces space) (type (or fixnum null) top-n))
 533   (format t "~2&~@[Top ~W ~]~(~A~) instance types:~%" top-n space)
 534   (let ((totals (make-hash-table :test 'eq))
 535         (total-objects 0)
 536         (total-bytes 0))
 537     (declare (fixnum total-objects total-bytes))
 538     (map-allocated-objects
 539      (lambda (obj type size)
 540        (declare (fixnum size) (optimize (speed 3) (safety 0)))
 541        (when (eql type instance-header-widetag)
 542          (incf total-objects)
 543          (incf total-bytes size)
 544          (let* ((classoid (layout-classoid (%instance-ref obj 0)))
 545                 (found (gethash classoid totals)))
 546            (cond (found
 547                   (incf (the fixnum (car found)))
 548                   (incf (the fixnum (cdr found)) size))
 549                  (t
 550                   (setf (gethash classoid totals) (cons 1 size)))))))
 551      space)
 552
 553     (collect ((totals-list))
 554       (maphash (lambda (classoid what)
 555                  (totals-list (cons (prin1-to-string
 556                                      (classoid-proper-name classoid))
 557                                     what)))
 558                totals)
 559       (let ((sorted (sort (totals-list) #'> :key #'cddr))
 560             (printed-bytes 0)
 561             (printed-objects 0))
 562         (declare (fixnum printed-bytes printed-objects))
 563         (dolist (what (if top-n
 564                           (subseq sorted 0 (min (length sorted) top-n))
 565                           sorted))
 566           (let ((bytes (cddr what))
 567                 (objects (cadr what)))
 568             (incf printed-bytes bytes)
 569             (incf printed-objects objects)
 570             (format t "  ~A: ~:D bytes, ~:D object~:P.~%" (car what)
 571                     bytes objects)))
 572
 573         (let ((residual-objects (- total-objects printed-objects))
 574               (residual-bytes (- total-bytes printed-bytes)))
 575           (unless (zerop residual-objects)
 576             (format t "  Other types: ~:D bytes, ~:D object~:P.~%"
 577                     residual-bytes residual-objects))))
 578
 579       (format t "  ~:(~A~) instance total: ~:D bytes, ~:D object~:P.~%"
 580               space total-bytes total-objects)))
 581
 582   (values))
 583 \f
 584 ;;;; PRINT-ALLOCATED-OBJECTS
 585
 586 (defun print-allocated-objects (space &key (percent 0) (pages 5)
 587                                       type larger smaller count
 588                                       (stream *standard-output*))
 589   (declare (type (integer 0 99) percent) (type index pages)
 590            (type stream stream) (type spaces space)
 591            (type (or index null) type larger smaller count))
 592   (multiple-value-bind (start-sap end-sap) (space-bounds space)
 593     (let* ((space-start (sap-int start-sap))
 594            (space-end (sap-int end-sap))
 595            (space-size (- space-end space-start))
 596            (pagesize (sb!sys:get-page-size))
 597            (start (+ space-start (round (* space-size percent) 100)))
 598            (printed-conses (make-hash-table :test 'eq))
 599            (pages-so-far 0)
 600            (count-so-far 0)
 601            (last-page 0))
 602       (declare (type (unsigned-byte 32) last-page start)
 603                (fixnum pages-so-far count-so-far pagesize))
 604       (labels ((note-conses (x)
 605                  (unless (or (atom x) (gethash x printed-conses))
 606                    (setf (gethash x printed-conses) t)
 607                    (note-conses (car x))
 608                    (note-conses (cdr x)))))
 609         (map-allocated-objects
 610          (lambda (obj obj-type size)
 611            (declare (optimize (safety 0)))
 612            (let ((addr (get-lisp-obj-address obj)))
 613              (when (>= addr start)
 614                (when (if count
 615                          (> count-so-far count)
 616                          (> pages-so-far pages))
 617                  (return-from print-allocated-objects (values)))
 618
 619                (unless count
 620                  (let ((this-page (* (the (values (unsigned-byte 32) t)
 621                                        (truncate addr pagesize))
 622                                      pagesize)))
 623                    (declare (type (unsigned-byte 32) this-page))
 624                    (when (/= this-page last-page)
 625                      (when (< pages-so-far pages)
 626                        ;; FIXME: What is this? (ERROR "Argh..")? or
 627                        ;; a warning? or code that can be removed
 628                        ;; once the system is stable? or what?
 629                        (format stream "~2&**** Page ~W, address ~X:~%"
 630                                pages-so-far addr))
 631                      (setq last-page this-page)
 632                      (incf pages-so-far))))
 633
 634                (when (and (or (not type) (eql obj-type type))
 635                           (or (not smaller) (<= size smaller))
 636                           (or (not larger) (>= size larger)))
 637                  (incf count-so-far)
 638                  (case type
 639                    (#.code-header-widetag
 640                     (let ((dinfo (%code-debug-info obj)))
 641                       (format stream "~&Code object: ~S~%"
 642                               (if dinfo
 643                                   (sb!c::compiled-debug-info-name dinfo)
 644                                   "No debug info."))))
 645                    (#.symbol-header-widetag
 646                     (format stream "~&~S~%" obj))
 647                    (#.list-pointer-lowtag
 648                     (unless (gethash obj printed-conses)
 649                       (note-conses obj)
 650                       (let ((*print-circle* t)
 651                             (*print-level* 5)
 652                             (*print-length* 10))
 653                         (format stream "~&~S~%" obj))))
 654                    (t
 655                     (fresh-line stream)
 656                     (let ((str (write-to-string obj :level 5 :length 10
 657                                                 :pretty nil)))
 658                       (unless (eql type instance-header-widetag)
 659                         (format stream "~S: " (type-of obj)))
 660                       (format stream "~A~%"
 661                               (subseq str 0 (min (length str) 60))))))))))
 662          space))))
 663   (values))
 664 \f
 665 ;;;; LIST-ALLOCATED-OBJECTS, LIST-REFERENCING-OBJECTS
 666
 667 (defvar *ignore-after* nil)
 668
 669 (defun valid-obj (space x)
 670   (or (not (eq space :dynamic))
 671       ;; this test looks bogus if the allocator doesn't work linearly,
 672       ;; which I suspect is the case for GENCGC.  -- CSR, 2004-06-29
 673       (< (get-lisp-obj-address x) (get-lisp-obj-address *ignore-after*))))
 674
 675 (defun maybe-cons (space x stuff)
 676   (if (valid-obj space x)
 677       (cons x stuff)
 678       stuff))
 679
 680 (defun list-allocated-objects (space &key type larger smaller count
 681                                      test)
 682   (declare (type spaces space)
 683            (type (or index null) larger smaller type count)
 684            (type (or function null) test)
 685            (inline map-allocated-objects))
 686   (unless *ignore-after*
 687     (setq *ignore-after* (cons 1 2)))
 688   (collect ((counted 0 1+))
 689     (let ((res ()))
 690       (map-allocated-objects
 691        (lambda (obj obj-type size)
 692          (declare (optimize (safety 0)))
 693          (when (and (or (not type) (eql obj-type type))
 694                     (or (not smaller) (<= size smaller))
 695                     (or (not larger) (>= size larger))
 696                     (or (not test) (funcall test obj)))
 697            (setq res (maybe-cons space obj res))
 698            (when (and count (>= (counted) count))
 699              (return-from list-allocated-objects res))))
 700        space)
 701       res)))
 702
 703 (defun map-referencing-objects (fun space object)
 704   (declare (type spaces space) (inline map-allocated-objects))
 705   (unless *ignore-after*
 706     (setq *ignore-after* (cons 1 2)))
 707   (flet ((maybe-call (fun obj)
 708            (when (valid-obj space obj)
 709              (funcall fun obj))))
 710     (map-allocated-objects
 711      (lambda (obj obj-type size)
 712        (declare (optimize (safety 0)) (ignore obj-type size))
 713        (typecase obj
 714          (cons
 715           (when (or (eq (car obj) object)
 716                     (eq (cdr obj) object))
 717             (maybe-call fun obj)))
 718          (instance
 719           (dotimes (i (%instance-length obj))
 720             (when (eq (%instance-ref obj i) object)
 721               (maybe-call fun obj)
 722               (return))))
 723          (code-component
 724           (let ((length (get-header-data obj)))
 725             (do ((i code-constants-offset (1+ i)))
 726                 ((= i length))
 727               (when (eq (code-header-ref obj i) object)
 728                 (maybe-call fun obj)
 729                 (return)))))
 730          (simple-vector
 731           (dotimes (i (length obj))
 732             (when (eq (svref obj i) object)
 733               (maybe-call fun obj)
 734               (return))))
 735          (symbol
 736           (when (or (eq (symbol-name obj) object)
 737                     (eq (symbol-package obj) object)
 738                     (eq (symbol-plist obj) object)
 739                     (eq (symbol-value obj) object))
 740             (maybe-call fun obj)))))
 741      space)))
 742
 743 (defun list-referencing-objects (space object)
 744   (collect ((res))
 745     (map-referencing-objects
 746      (lambda (obj) (res obj)) space object)
 747     (res)))