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   (declare (fixnum size))
 190   (logand (the fixnum (+ size lowtag-mask)) (lognot lowtag-mask)))
 191
 192 ;;; Return the total size of a vector in bytes, including any pad.
 193 #!-sb-fluid (declaim (inline vector-total-size))
 194 (defun vector-total-size (obj info)
 195   (let ((shift (room-info-length info))
 196         (len (+ (length (the (simple-array * (*)) obj))
 197                 (ecase (room-info-kind info)
 198                   (:vector 0)
 199                   (:string 1)))))
 200     (round-to-dualword
 201      (+ (* vector-data-offset n-word-bytes)
 202         (if (minusp shift)
 203             (ash (+ len (1- (ash 1 (- shift))))
 204                  shift)
 205             (ash len shift))))))
 206
 207 ;;; Access to the GENCGC page table for better precision in
 208 ;;; MAP-ALLOCATED-OBJECTS
 209 #!+gencgc
 210 (progn
 211   (define-alien-type (struct page)
 212       (struct page
 213               (start long)
 214               ;; On platforms with small enough GC pages, this field
 215               ;; will be a short. On platforms with larger ones, it'll
 216               ;; be an int.
 217               (bytes-used (unsigned
 218                            #.(if (typep sb!vm:gencgc-page-size
 219                                         '(unsigned-byte 16))
 220                                  16
 221                                  32)))
 222               (flags (unsigned 8))
 223               (gen (signed 8))))
 224   (declaim (inline find-page-index))
 225   (define-alien-routine "find_page_index" long (index long))
 226   (define-alien-variable "page_table" (* (struct page))))
 227
 228 ;;; Iterate over all the objects allocated in SPACE, calling FUN with
 229 ;;; the object, the object's type code, and the object's total size in
 230 ;;; bytes, including any header and padding.
 231 #!-sb-fluid (declaim (maybe-inline map-allocated-objects))
 232 (defun map-allocated-objects (fun space)
 233   (declare (type function fun) (type spaces space))
 234   (without-gcing
 235    (multiple-value-bind (start end) (space-bounds space)
 236      (declare (type system-area-pointer start end))
 237      (declare (optimize (speed 3)))
 238      (let ((current start)
 239            #!+gencgc (skip-tests-until-addr 0))
 240        (labels ((maybe-finish-mapping ()
 241                   (unless (sap< current end)
 242                     (aver (sap= current end))
 243                     (return-from map-allocated-objects)))
 244                 ;; GENCGC doesn't allocate linearly, which means that the
 245                 ;; dynamic space can contain large blocks zeros that get
 246                 ;; accounted as conses in ROOM (and slow down other
 247                 ;; applications of MAP-ALLOCATED-OBJECTS). To fix this
 248                 ;; check the GC page structure for the current address.
 249                 ;; If the page is free or the address is beyond the page-
 250                 ;; internal allocation offset (bytes-used) skip to the
 251                 ;; next page immediately.
 252                 (maybe-skip-page ()
 253                   #!+gencgc
 254                   (when (eq space :dynamic)
 255                     (loop with page-mask = #.(1- sb!vm:gencgc-page-size)
 256                           for addr of-type sb!vm:word = (sap-int current)
 257                           while (>= addr skip-tests-until-addr)
 258                           do
 259                           ;; For some reason binding PAGE with LET
 260                           ;; conses like mad (but gives no compiler notes...)
 261                           ;; Work around the problem with SYMBOL-MACROLET
 262                           ;; instead of trying to figure out the real
 263                           ;; issue. -- JES, 2005-05-17
 264                           (symbol-macrolet
 265                               ((page (deref page-table
 266                                             (find-page-index addr))))
 267                             ;; Don't we have any nicer way to access C struct
 268                             ;; bitfields?
 269                             (let ((alloc-flag (ldb (byte 3 2)
 270                                                    (slot page 'flags)))
 271                                   (bytes-used (slot page 'bytes-used)))
 272                               ;; If the page is not free and the current
 273                               ;; pointer is still below the allocation offset
 274                               ;; of the page
 275                               (when (and (not (zerop alloc-flag))
 276                                          (<= (logand page-mask addr)
 277                                              bytes-used))
 278                                 ;; Don't bother testing again until we
 279                                 ;; get past that allocation offset
 280                                 (setf skip-tests-until-addr
 281                                       (+ (logandc2 addr page-mask)
 282                                          (the fixnum bytes-used)))
 283                                 ;; And then continue with the scheduled
 284                                 ;; mapping
 285                                 (return-from maybe-skip-page))
 286                               ;; Move CURRENT to start of next page
 287                               (setf current (int-sap (+ (logandc2 addr page-mask)
 288                                                         sb!vm:gencgc-page-size)))
 289                               (maybe-finish-mapping)))))))
 290          (declare (inline maybe-finish-mapping maybe-skip-page))
 291          (loop
 292              (maybe-finish-mapping)
 293              (maybe-skip-page)
 294            (let* ((header (sap-ref-word current 0))
 295                   (header-widetag (logand header #xFF))
 296                   (info (svref *room-info* header-widetag)))
 297              (cond
 298                ((or (not info)
 299                     (eq (room-info-kind info) :lowtag))
 300                 (let ((size (* cons-size n-word-bytes)))
 301                   (funcall fun
 302                            (make-lisp-obj (logior (sap-int current)
 303                                                   list-pointer-lowtag))
 304                            list-pointer-lowtag
 305                            size)
 306                   (setq current (sap+ current size))))
 307                ((eql header-widetag closure-header-widetag)
 308                 (let* ((obj (make-lisp-obj (logior (sap-int current)
 309                                                    fun-pointer-lowtag)))
 310                        (size (round-to-dualword
 311                               (* (the fixnum (1+ (get-closure-length obj)))
 312                                  n-word-bytes))))
 313                   (funcall fun obj header-widetag size)
 314                   (setq current (sap+ current size))))
 315                ((eq (room-info-kind info) :instance)
 316                 (let* ((obj (make-lisp-obj
 317                              (logior (sap-int current) instance-pointer-lowtag)))
 318                        (size (round-to-dualword
 319                               (* (+ (%instance-length obj) 1) n-word-bytes))))
 320                   (declare (fixnum size))
 321                   (funcall fun obj header-widetag size)
 322                   (aver (zerop (logand size lowtag-mask)))
 323                   (setq current (sap+ current size))))
 324                (t
 325                 (let* ((obj (make-lisp-obj
 326                              (logior (sap-int current) other-pointer-lowtag)))
 327                        (size (ecase (room-info-kind info)
 328                                (:fixed
 329                                 (aver (or (eql (room-info-length info)
 330                                                (1+ (get-header-data obj)))
 331                                           (floatp obj)
 332                                           (simple-array-nil-p obj)))
 333                                 (round-to-dualword
 334                                  (* (room-info-length info) n-word-bytes)))
 335                                ((:vector :string)
 336                                 (vector-total-size obj info))
 337                                (:header
 338                                 (round-to-dualword
 339                                  (* (1+ (get-header-data obj)) n-word-bytes)))
 340                                (:code
 341                                 (+ (the fixnum
 342                                      (* (get-header-data obj) n-word-bytes))
 343                                    (round-to-dualword
 344                                     (* (the fixnum (%code-code-size obj))
 345                                        n-word-bytes)))))))
 346                   (declare (fixnum size))
 347                   (funcall fun obj header-widetag size)
 348                   (aver (zerop (logand size lowtag-mask)))
 349                   (setq current (sap+ current size))))))))))))
 350
 351 \f
 352 ;;;; MEMORY-USAGE
 353
 354 ;;; Return a list of 3-lists (bytes object type-name) for the objects
 355 ;;; allocated in Space.
 356 (defun type-breakdown (space)
 357   (let ((sizes (make-array 256 :initial-element 0 :element-type 'fixnum))
 358         (counts (make-array 256 :initial-element 0 :element-type 'fixnum)))
 359     (map-allocated-objects
 360      (lambda (obj type size)
 361        (declare (fixnum size) (optimize (speed 3)) (ignore obj))
 362        (incf (aref sizes type) size)
 363        (incf (aref counts type)))
 364      space)
 365
 366     (let ((totals (make-hash-table :test 'eq)))
 367       (dotimes (i 256)
 368         (let ((total-count (aref counts i)))
 369           (unless (zerop total-count)
 370             (let* ((total-size (aref sizes i))
 371                    (name (room-info-name (aref *room-info* i)))
 372                    (found (gethash name totals)))
 373               (cond (found
 374                      (incf (first found) total-size)
 375                      (incf (second found) total-count))
 376                     (t
 377                      (setf (gethash name totals)
 378                            (list total-size total-count name))))))))
 379
 380       (collect ((totals-list))
 381         (maphash (lambda (k v)
 382                    (declare (ignore k))
 383                    (totals-list v))
 384                  totals)
 385         (sort (totals-list) #'> :key #'first)))))
 386
 387 ;;; Handle the summary printing for MEMORY-USAGE. Totals is a list of lists
 388 ;;; (space-name . totals-for-space), where totals-for-space is the list
 389 ;;; returned by TYPE-BREAKDOWN.
 390 (defun print-summary (spaces totals)
 391   (let ((summary (make-hash-table :test 'eq)))
 392     (dolist (space-total totals)
 393       (dolist (total (cdr space-total))
 394         (push (cons (car space-total) total)
 395               (gethash (third total) summary))))
 396
 397     (collect ((summary-totals))
 398       (maphash (lambda (k v)
 399                  (declare (ignore k))
 400                  (let ((sum 0))
 401                    (declare (fixnum sum))
 402                    (dolist (space-total v)
 403                      (incf sum (first (cdr space-total))))
 404                    (summary-totals (cons sum v))))
 405                summary)
 406
 407       (format t "~2&Summary of spaces: ~(~{~A ~}~)~%" spaces)
 408       (let ((summary-total-bytes 0)
 409             (summary-total-objects 0))
 410         (declare (fixnum summary-total-bytes summary-total-objects))
 411         (dolist (space-totals
 412                  (mapcar #'cdr (sort (summary-totals) #'> :key #'car)))
 413           (let ((total-objects 0)
 414                 (total-bytes 0)
 415                 name)
 416             (declare (fixnum total-objects total-bytes))
 417             (collect ((spaces))
 418               (dolist (space-total space-totals)
 419                 (let ((total (cdr space-total)))
 420                   (setq name (third total))
 421                   (incf total-bytes (first total))
 422                   (incf total-objects (second total))
 423                   (spaces (cons (car space-total) (first total)))))
 424               (format t "~%~A:~%    ~:D bytes, ~:D object~:P"
 425                       name total-bytes total-objects)
 426               (dolist (space (spaces))
 427                 (format t ", ~W% ~(~A~)"
 428                         (round (* (cdr space) 100) total-bytes)
 429                         (car space)))
 430               (format t ".~%")
 431               (incf summary-total-bytes total-bytes)
 432               (incf summary-total-objects total-objects))))
 433         (format t "~%Summary total:~%    ~:D bytes, ~:D objects.~%"
 434                 summary-total-bytes summary-total-objects)))))
 435
 436 ;;; Report object usage for a single space.
 437 (defun report-space-total (space-total cutoff)
 438   (declare (list space-total) (type (or single-float null) cutoff))
 439   (format t "~2&Breakdown for ~(~A~) space:~%" (car space-total))
 440   (let* ((types (cdr space-total))
 441          (total-bytes (reduce #'+ (mapcar #'first types)))
 442          (total-objects (reduce #'+ (mapcar #'second types)))
 443          (cutoff-point (if cutoff
 444                            (truncate (* (float total-bytes) cutoff))
 445                            0))
 446          (reported-bytes 0)
 447          (reported-objects 0))
 448     (declare (fixnum total-objects total-bytes cutoff-point reported-objects
 449                      reported-bytes))
 450     (loop for (bytes objects name) in types do
 451       (when (<= bytes cutoff-point)
 452         (format t "  ~10:D bytes for ~9:D other object~2:*~P.~%"
 453                 (- total-bytes reported-bytes)
 454                 (- total-objects reported-objects))
 455         (return))
 456       (incf reported-bytes bytes)
 457       (incf reported-objects objects)
 458       (format t "  ~10:D bytes for ~9:D ~(~A~) object~2:*~P.~%"
 459               bytes objects name))
 460     (format t "  ~10:D bytes for ~9:D ~(~A~) object~2:*~P (space total.)~%"
 461             total-bytes total-objects (car space-total))))
 462
 463 ;;; Print information about the heap memory in use. PRINT-SPACES is a
 464 ;;; list of the spaces to print detailed information for.
 465 ;;; COUNT-SPACES is a list of the spaces to scan. For either one, T
 466 ;;; means all spaces (i.e. :STATIC, :DYNAMIC and :READ-ONLY.) If
 467 ;;; PRINT-SUMMARY is true, then summary information will be printed.
 468 ;;; The defaults print only summary information for dynamic space. If
 469 ;;; true, CUTOFF is a fraction of the usage in a report below which
 470 ;;; types will be combined as OTHER.
 471 (defun memory-usage (&key print-spaces (count-spaces '(:dynamic))
 472                           (print-summary t) cutoff)
 473   (declare (type (or single-float null) cutoff))
 474   (let* ((spaces (if (eq count-spaces t)
 475                      '(:static :dynamic :read-only)
 476                      count-spaces))
 477          (totals (mapcar (lambda (space)
 478                            (cons space (type-breakdown space)))
 479                          spaces)))
 480
 481     (dolist (space-total totals)
 482       (when (or (eq print-spaces t)
 483                 (member (car space-total) print-spaces))
 484         (report-space-total space-total cutoff)))
 485
 486     (when print-summary (print-summary spaces totals)))
 487
 488   (values))
 489 \f
 490 ;;; Print info about how much code and no-ops there are in SPACE.
 491 (defun count-no-ops (space)
 492   (declare (type spaces space))
 493   (let ((code-words 0)
 494         (no-ops 0)
 495         (total-bytes 0))
 496     (declare (fixnum code-words no-ops)
 497              (type unsigned-byte total-bytes))
 498     (map-allocated-objects
 499      (lambda (obj type size)
 500        (declare (fixnum size))
 501        (when (eql type code-header-widetag)
 502          (incf total-bytes size)
 503          (let ((words (truly-the fixnum (%code-code-size obj)))
 504                (sap (truly-the system-area-pointer
 505                                (%primitive code-instructions obj))))
 506            (incf code-words words)
 507            (dotimes (i words)
 508              (when (zerop (sap-ref-word sap (* i n-word-bytes)))
 509                (incf no-ops))))))
 510      space)
 511
 512     (format t
 513             "~:D code-object bytes, ~:D code words, with ~:D no-ops (~D%).~%"
 514             total-bytes code-words no-ops
 515             (round (* no-ops 100) code-words)))
 516
 517   (values))
 518 \f
 519 (defun descriptor-vs-non-descriptor-storage (&rest spaces)
 520   (let ((descriptor-words 0)
 521         (non-descriptor-headers 0)
 522         (non-descriptor-bytes 0))
 523     (declare (type unsigned-byte descriptor-words non-descriptor-headers
 524                    non-descriptor-bytes))
 525     (dolist (space (or spaces '(:read-only :static :dynamic)))
 526       (declare (inline map-allocated-objects))
 527       (map-allocated-objects
 528        (lambda (obj type size)
 529          (declare (fixnum size))
 530          (case type
 531            (#.code-header-widetag
 532             (let ((inst-words (truly-the fixnum (%code-code-size obj))))
 533               (declare (type fixnum inst-words))
 534               (incf non-descriptor-bytes (* inst-words n-word-bytes))
 535               (incf descriptor-words
 536                     (- (truncate size n-word-bytes) inst-words))))
 537            ((#.bignum-widetag
 538              #.single-float-widetag
 539              #.double-float-widetag
 540              #.simple-base-string-widetag
 541              #!+sb-unicode #.simple-character-string-widetag
 542              #.simple-array-nil-widetag
 543              #.simple-bit-vector-widetag
 544              #.simple-array-unsigned-byte-2-widetag
 545              #.simple-array-unsigned-byte-4-widetag
 546              #.simple-array-unsigned-byte-8-widetag
 547              #.simple-array-unsigned-byte-16-widetag
 548              #.simple-array-unsigned-byte-32-widetag
 549              #.simple-array-signed-byte-8-widetag
 550              #.simple-array-signed-byte-16-widetag
 551              ; #.simple-array-signed-byte-30-widetag
 552              #.simple-array-signed-byte-32-widetag
 553              #.simple-array-single-float-widetag
 554              #.simple-array-double-float-widetag
 555              #.simple-array-complex-single-float-widetag
 556              #.simple-array-complex-double-float-widetag)
 557             (incf non-descriptor-headers)
 558             (incf non-descriptor-bytes (- size n-word-bytes)))
 559            ((#.list-pointer-lowtag
 560              #.instance-pointer-lowtag
 561              #.ratio-widetag
 562              #.complex-widetag
 563              #.simple-array-widetag
 564              #.simple-vector-widetag
 565              #.complex-base-string-widetag
 566              #.complex-vector-nil-widetag
 567              #.complex-bit-vector-widetag
 568              #.complex-vector-widetag
 569              #.complex-array-widetag
 570              #.closure-header-widetag
 571              #.funcallable-instance-header-widetag
 572              #.value-cell-header-widetag
 573              #.symbol-header-widetag
 574              #.sap-widetag
 575              #.weak-pointer-widetag
 576              #.instance-header-widetag)
 577             (incf descriptor-words (truncate size n-word-bytes)))
 578            (t
 579             (error "bogus widetag: ~W" type))))
 580        space))
 581     (format t "~:D words allocated for descriptor objects.~%"
 582             descriptor-words)
 583     (format t "~:D bytes data/~:D words header for non-descriptor objects.~%"
 584             non-descriptor-bytes non-descriptor-headers)
 585     (values)))
 586 \f
 587 ;;; Print a breakdown by instance type of all the instances allocated
 588 ;;; in SPACE. If TOP-N is true, print only information for the
 589 ;;; TOP-N types with largest usage.
 590 (defun instance-usage (space &key (top-n 15))
 591   (declare (type spaces space) (type (or fixnum null) top-n))
 592   (format t "~2&~@[Top ~W ~]~(~A~) instance types:~%" top-n space)
 593   (let ((totals (make-hash-table :test 'eq))
 594         (total-objects 0)
 595         (total-bytes 0))
 596     (declare (fixnum total-objects total-bytes))
 597     (map-allocated-objects
 598      (lambda (obj type size)
 599        (declare (fixnum size) (optimize (speed 3)))
 600        (when (eql type instance-header-widetag)
 601          (incf total-objects)
 602          (incf total-bytes size)
 603          (let* ((classoid (layout-classoid (%instance-ref obj 0)))
 604                 (found (gethash classoid totals)))
 605            (cond (found
 606                   (incf (the fixnum (car found)))
 607                   (incf (the fixnum (cdr found)) size))
 608                  (t
 609                   (setf (gethash classoid totals) (cons 1 size)))))))
 610      space)
 611
 612     (collect ((totals-list))
 613       (maphash (lambda (classoid what)
 614                  (totals-list (cons (prin1-to-string
 615                                      (classoid-proper-name classoid))
 616                                     what)))
 617                totals)
 618       (let ((sorted (sort (totals-list) #'> :key #'cddr))
 619             (printed-bytes 0)
 620             (printed-objects 0))
 621         (declare (fixnum printed-bytes printed-objects))
 622         (dolist (what (if top-n
 623                           (subseq sorted 0 (min (length sorted) top-n))
 624                           sorted))
 625           (let ((bytes (cddr what))
 626                 (objects (cadr what)))
 627             (incf printed-bytes bytes)
 628             (incf printed-objects objects)
 629             (format t "  ~A: ~:D bytes, ~:D object~:P.~%" (car what)
 630                     bytes objects)))
 631
 632         (let ((residual-objects (- total-objects printed-objects))
 633               (residual-bytes (- total-bytes printed-bytes)))
 634           (unless (zerop residual-objects)
 635             (format t "  Other types: ~:D bytes, ~:D object~:P.~%"
 636                     residual-bytes residual-objects))))
 637
 638       (format t "  ~:(~A~) instance total: ~:D bytes, ~:D object~:P.~%"
 639               space total-bytes total-objects)))
 640
 641   (values))
 642 \f
 643 ;;;; PRINT-ALLOCATED-OBJECTS
 644
 645 (defun print-allocated-objects (space &key (percent 0) (pages 5)
 646                                       type larger smaller count
 647                                       (stream *standard-output*))
 648   (declare (type (integer 0 99) percent) (type index pages)
 649            (type stream stream) (type spaces space)
 650            (type (or index null) type larger smaller count))
 651   (multiple-value-bind (start-sap end-sap) (space-bounds space)
 652     (let* ((space-start (sap-int start-sap))
 653            (space-end (sap-int end-sap))
 654            (space-size (- space-end space-start))
 655            (pagesize (sb!sys:get-page-size))
 656            (start (+ space-start (round (* space-size percent) 100)))
 657            (printed-conses (make-hash-table :test 'eq))
 658            (pages-so-far 0)
 659            (count-so-far 0)
 660            (last-page 0))
 661       (declare (type (unsigned-byte 32) last-page start)
 662                (fixnum pages-so-far count-so-far pagesize))
 663       (labels ((note-conses (x)
 664                  (unless (or (atom x) (gethash x printed-conses))
 665                    (setf (gethash x printed-conses) t)
 666                    (note-conses (car x))
 667                    (note-conses (cdr x)))))
 668         (map-allocated-objects
 669          (lambda (obj obj-type size)
 670            (let ((addr (get-lisp-obj-address obj)))
 671              (when (>= addr start)
 672                (when (if count
 673                          (> count-so-far count)
 674                          (> pages-so-far pages))
 675                  (return-from print-allocated-objects (values)))
 676
 677                (unless count
 678                  (let ((this-page (* (the (values (unsigned-byte 32) t)
 679                                        (truncate addr pagesize))
 680                                      pagesize)))
 681                    (declare (type (unsigned-byte 32) this-page))
 682                    (when (/= this-page last-page)
 683                      (when (< pages-so-far pages)
 684                        ;; FIXME: What is this? (ERROR "Argh..")? or
 685                        ;; a warning? or code that can be removed
 686                        ;; once the system is stable? or what?
 687                        (format stream "~2&**** Page ~W, address ~X:~%"
 688                                pages-so-far addr))
 689                      (setq last-page this-page)
 690                      (incf pages-so-far))))
 691
 692                (when (and (or (not type) (eql obj-type type))
 693                           (or (not smaller) (<= size smaller))
 694                           (or (not larger) (>= size larger)))
 695                  (incf count-so-far)
 696                  (case type
 697                    (#.code-header-widetag
 698                     (let ((dinfo (%code-debug-info obj)))
 699                       (format stream "~&Code object: ~S~%"
 700                               (if dinfo
 701                                   (sb!c::compiled-debug-info-name dinfo)
 702                                   "No debug info."))))
 703                    (#.symbol-header-widetag
 704                     (format stream "~&~S~%" obj))
 705                    (#.list-pointer-lowtag
 706                     (unless (gethash obj printed-conses)
 707                       (note-conses obj)
 708                       (let ((*print-circle* t)
 709                             (*print-level* 5)
 710                             (*print-length* 10))
 711                         (format stream "~&~S~%" obj))))
 712                    (t
 713                     (fresh-line stream)
 714                     (let ((str (write-to-string obj :level 5 :length 10
 715                                                 :pretty nil)))
 716                       (unless (eql type instance-header-widetag)
 717                         (format stream "~S: " (type-of obj)))
 718                       (format stream "~A~%"
 719                               (subseq str 0 (min (length str) 60))))))))))
 720          space))))
 721   (values))
 722 \f
 723 ;;;; LIST-ALLOCATED-OBJECTS, LIST-REFERENCING-OBJECTS
 724
 725 (defvar *ignore-after* nil)
 726
 727 (defun valid-obj (space x)
 728   (or (not (eq space :dynamic))
 729       ;; this test looks bogus if the allocator doesn't work linearly,
 730       ;; which I suspect is the case for GENCGC.  -- CSR, 2004-06-29
 731       (< (get-lisp-obj-address x) (get-lisp-obj-address *ignore-after*))))
 732
 733 (defun maybe-cons (space x stuff)
 734   (if (valid-obj space x)
 735       (cons x stuff)
 736       stuff))
 737
 738 (defun list-allocated-objects (space &key type larger smaller count
 739                                      test)
 740   (declare (type spaces space)
 741            (type (or index null) larger smaller type count)
 742            (type (or function null) test)
 743            (inline map-allocated-objects))
 744   (unless *ignore-after*
 745     (setq *ignore-after* (cons 1 2)))
 746   (collect ((counted 0 1+))
 747     (let ((res ()))
 748       (map-allocated-objects
 749        (lambda (obj obj-type size)
 750          (when (and (or (not type) (eql obj-type type))
 751                     (or (not smaller) (<= size smaller))
 752                     (or (not larger) (>= size larger))
 753                     (or (not test) (funcall test obj)))
 754            (setq res (maybe-cons space obj res))
 755            (when (and count (>= (counted) count))
 756              (return-from list-allocated-objects res))))
 757        space)
 758       res)))
 759
 760 (defun map-referencing-objects (fun space object)
 761   (declare (type spaces space) (inline map-allocated-objects))
 762   (unless *ignore-after*
 763     (setq *ignore-after* (cons 1 2)))
 764   (flet ((maybe-call (fun obj)
 765            (when (valid-obj space obj)
 766              (funcall fun obj))))
 767     (map-allocated-objects
 768      (lambda (obj obj-type size)
 769        (declare (ignore obj-type size))
 770        (typecase obj
 771          (cons
 772           (when (or (eq (car obj) object)
 773                     (eq (cdr obj) object))
 774             (maybe-call fun obj)))
 775          (instance
 776           (dotimes (i (%instance-length obj))
 777             (when (eq (%instance-ref obj i) object)
 778               (maybe-call fun obj)
 779               (return))))
 780          (code-component
 781           (let ((length (get-header-data obj)))
 782             (do ((i code-constants-offset (1+ i)))
 783                 ((= i length))
 784               (when (eq (code-header-ref obj i) object)
 785                 (maybe-call fun obj)
 786                 (return)))))
 787          (simple-vector
 788           (dotimes (i (length obj))
 789             (when (eq (svref obj i) object)
 790               (maybe-call fun obj)
 791               (return))))
 792          (symbol
 793           (when (or (eq (symbol-name obj) object)
 794                     (eq (symbol-package obj) object)
 795                     (eq (symbol-plist obj) object)
 796                     (eq (symbol-value obj) object))
 797             (maybe-call fun obj)))))
 798      space)))
 799
 800 (defun list-referencing-objects (space object)
 801   (collect ((res))
 802     (map-referencing-objects
 803      (lambda (obj) (res obj)) space object)
 804     (res)))