Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
branch: master
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 640 lines (564 sloc) 26.585 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639
(in-package :cl-js)

(defvar *env*)

(eval-when (:compile-toplevel :load-toplevel :execute)
  (defparameter *std-types*
    #(:object :function :array :string :arguments :regexp #+js-dates :date :error :type-error
      :reference-error :syntax-error :uri-error :range-error :eval-error :boolean :number))
  (defun type-offset (id)
    (declare (optimize speed (safety 0)))
    (loop :for off :of-type fixnum :below (length (the simple-vector *std-types*)) :do
       (when (eq id (svref *std-types* off)) (return off)))))

(defmacro find-proto (id)
  (let ((std (and (keywordp id) (position id *std-types* :test #'eq))))
    (if std
        `(svref (gobj-proto-vec *env*) ,std)
        `(lookup-prototype ,id))))
(defmacro find-cls (id)
  (let ((std (and (keywordp id) (position id *std-types* :test #'eq))))
    (if std
        `(svref (gobj-class-vec *env*) ,std)
        `(lookup-class ,id))))
(defun lookup-prototype (id)
  (let ((std (position id *std-types* :test #'eq)))
    (or (and std (svref (gobj-proto-vec *env*) std))
        (second (assoc id (gobj-proto-list *env*) :test #'eq))
        (error "No prototype ~a defined." id))))
(defun lookup-class (id)
  (let ((std (position id *std-types* :test #'eq)))
    (or (and std (svref (gobj-class-vec *env*) std))
        (cddr (assoc id (gobj-proto-list *env*) :test #'eq))
        (error "No prototype ~a defined." id))))


;; (Some of this code is *really* unorthogonal, repeating itself a
;; lot. This is mostly due to the fact that we are using different
;; code paths, some of which can assume previously-checked conditions,
;; to optimize.)

(eval-when (:compile-toplevel)
  (declaim (optimize speed (safety 0))))

(defstruct cls prototype)
(defstruct (scls (:constructor make-scls (props prototype)) (:include cls))
  props children)
(defstruct (hcls (:constructor make-hcls (prototype)) (:include cls)))

(defstruct (obj (:constructor make-obj (cls &optional vals)))
  cls (vals (make-array 4)))
(defstruct (vobj (:constructor make-vobj (cls &optional value)) (:include obj))
  value)
(defstruct (fobj (:constructor make-fobj (cls proc new-cls &optional vals)) (:include obj))
  proc new-cls)
(defstruct (cfobj (:constructor make-cfobj (cls proc new-cls make-new &optional vals)) (:include fobj))
  make-new)
(defstruct (gobj (:constructor make-gobj (cls vals proto-vec class-vec)) (:include obj))
  proto-vec class-vec proto-list required)
(defstruct (aobj (:constructor make-aobj (cls &optional arr)) (:include obj))
  (arr (empty-fvector 0)))
(defstruct (reobj (:constructor make-reobj (cls &optional proc scanner global)) (:include fobj))
  scanner global)
#+js-dates
(defstruct (dobj (:constructor make-dobj (cls &optional time zone)) (:include obj))
  time zone)
(defstruct (argobj (:constructor make-argobj (cls list length callee)) (:include obj))
  list length callee)

(defun make-sequence-printer (stream)
  (let ((count 0))
    (lambda (x)
      (cond
        ((not count))
        ((and *print-length* (<= *print-length* count))
         (format stream " ...")
         (setf count nil))
        (t
         (unless (= count 0)
           (format stream ", "))
         (princ x stream)
         (incf count))))))

(defmethod print-object ((obj obj) stream)
  (let ((*print-circle* t))
    (format stream "#<js obj {")
    (let ((output (make-sequence-printer stream)))
      (js-for-in obj
                 (lambda (key)
                   (funcall output (format nil "~S: ~S" key (js-prop obj key))))
                 t))
    (format stream "}>")))

(defmethod print-object ((aobj aobj) stream)
  (format stream "#<js array [")
  (let ((output (make-sequence-printer stream)))
    (map nil output (aobj-arr aobj)))
  (format stream "]>"))

(defmethod print-object ((func fobj) stream)
  (format stream "#<js function ~A>" (fobj-proc func)))

(defmethod obj-class-name ((obj obj)) "Object")
(defmethod obj-class-name ((obj fobj)) "Function")
(defmethod obj-class-name ((obj cfobj)) "Object")
(defmethod obj-class-name ((obj dobj)) "Date")
(defmethod obj-class-name ((obj argobj)) "Arguments")
(defmethod obj-class-name ((obj aobj)) "Array")
(defmethod obj-class-name ((obj reobj)) "RegExp")
(defmethod obj-class-name ((obj (eql :undefined))) "Undefined")
(defmethod obj-class-name ((obj (eql :null))) "Undefined")
(defmethod obj-class-name ((obj (eql t))) "Boolean")
(defmethod obj-class-name ((obj (eql nil))) "Boolean")
(defmethod obj-class-name ((obj number)) "Number")
(defmethod obj-class-name ((obj string)) "String")
(defmethod obj-class-name ((obj t)) "Object")

;; Slots are (offset . flags) conses for scls objects, (value . flags) conses for hcls
(defconstant +slot-ro+ 1)
(defconstant +slot-active+ 2)
(defconstant +slot-noenum+ 4)
(defconstant +slot-nodel+ 8)
(defconstant +slot-dflt+ 0)

(defun hash-obj (obj hcls)
  (let* ((scls (obj-cls obj))
         (hcls (or hcls (make-hcls (cls-prototype scls))))
         (vec (obj-vals obj))
         (table (make-hash-table :test 'eq :size (* (length vec) 2))))
    (loop :for (prop offset . flags) :in (scls-props scls) :do
       (setf (gethash prop table) (cons (svref vec offset) flags)))
    (setf (obj-cls obj) hcls (obj-vals obj) table))
  obj)

(defun proc (val)
  (if (fobj-p val)
      (fobj-proc val)
      (js-error :type-error "~a is not a function." (to-string val))))

(eval-when (:compile-toplevel :load-toplevel :execute)
  (defvar *prop-names*
    #+allegro (make-hash-table :test 'equal :weak-keys t :values :weak)
    #+sbcl (make-hash-table :test 'equal :weakness :key-or-value)
    #-(or allegro sbcl) (make-hash-table :test 'equal))) ;; Space leak when we don't have weak hashes
(defun intern-prop (prop)
  (or (gethash prop *prop-names*)
      (setf (gethash prop *prop-names*) prop)))

(defmacro lookup-slot (scls prop)
  `(cdr (assoc ,prop (scls-props ,scls) :test #'eq)))
(defmacro dcall (proc obj &rest args)
  `(funcall (the function ,proc) ,obj ,@args))

(defstruct (cache (:constructor make-cache (prop)))
  (op #'cache-miss) prop cls a1 a2)

(defmethod static-js-prop ((obj obj) cache)
  (funcall (the function (cache-op cache)) obj obj cache))
(defmethod static-js-prop (obj cache)
  (declare (ignore cache))
  (js-error :type-error "~a has no properties." (to-string obj)))

(defun do-lookup (obj start prop)
  (simple-lookup obj start (intern-prop (if (stringp prop) prop (to-string prop)))))
(defmethod js-prop ((obj obj) prop)
  (do-lookup obj obj prop))
(defmethod js-prop (obj prop)
  (declare (ignore prop))
  (js-error :type-error "~a has no properties." (to-string obj)))

(defun index-in-range (index len)
  (if (and (typep index 'fixnum) (>= index 0) (< index len))
      index
      (let ((index (to-string index)) index-int)
        (declare (string index))
        (if (and (loop :for ch :across index :do
                    (unless (<= #.(char-code #\0) (char-code ch) #.(char-code #\9)) (return nil))
                    :finally (return t))
                 (progn (setf index-int (parse-integer index)) (>= index-int 0) (< index-int len)))
            index-int
            nil))))

(defmethod js-prop ((obj aobj) prop)
  (let* ((vec (aobj-arr obj))
         (index (index-in-range prop (length vec))))
    (if index
        (aref vec index)
        (do-lookup obj obj prop))))
(defmethod js-prop ((obj argobj) prop)
  (let ((lst (argobj-list obj))
        (index (index-in-range prop (argobj-length obj))))
    (if index
        (nth index lst)
        (do-lookup obj obj prop))))

(defvar *not-found* :undefined)
(defmacro if-not-found ((var lookup) &body then/else)
  (unless var (setf var (gensym)))
  `(let ((,var (let ((*not-found* :not-found)) ,lookup)))
     (declare (ignorable ,var))
     (if (eq ,var :not-found) ,@then/else)))

;; Used for non-cached lookups
(defun simple-lookup (this start prop)
  (loop :for obj := start :then (or (cls-prototype cls) (return *not-found*))
        :for cls := (obj-cls obj) :for vals := (obj-vals obj) :do
     (macrolet ((maybe-active (slot value)
                  `(if (logtest (cdr ,slot) +slot-active+)
                       (dcall (car ,value) this)
                       ,value)))
       (if (hash-table-p vals)
           (let ((slot (gethash prop vals)))
             (when slot
               (return (maybe-active slot (car slot)))))
           (let ((slot (lookup-slot cls prop)))
             (when slot
               (return (maybe-active slot (svref vals (car slot))))))))))

(defun cache-miss (val obj cache)
  (multiple-value-bind (fn a1 a2 result) (meta-lookup val obj (cache-prop cache))
    (setf (cache-op cache) fn (cache-a1 cache) a1 (cache-a2 cache) a2 (cache-cls cache) (obj-cls obj))
    result))

(defun %direct-lookup (val obj cache)
  (if (eq (cache-cls cache) (obj-cls obj))
      (svref (obj-vals obj) (cache-a1 cache))
      (cache-miss val obj cache)))

(defun %direct-lookup-d (val obj cache)
  (if (eq (cache-cls cache) (obj-cls obj))
      (dcall (car (svref (obj-vals obj) (cache-a1 cache))) val)
      (cache-miss val obj cache)))

(defun %direct-lookup-m (val obj cache)
  (if (eq (cache-cls cache) (obj-cls obj))
      *not-found*
      (cache-miss val obj cache)))

(defun %direct-lookup-h (val obj cache)
  (if (hash-table-p (obj-vals obj))
      (simple-lookup val obj (cache-prop cache))
      (cache-miss val obj cache)))

(defun %proto-lookup (val obj cache)
  (let* ((cls (obj-cls obj))
         (proto (cls-prototype cls)))
    (if (and (eq (cache-cls cache) cls)
             (eq (cache-a2 cache) (obj-cls proto)))
        (svref (obj-vals proto) (cache-a1 cache))
        (cache-miss val obj cache))))

(defun %proto-lookup-d (val obj cache)
  (let* ((cls (obj-cls obj))
         (proto (cls-prototype cls)))
    (if (and (eq (cache-cls cache) cls)
             (eq (cache-a2 cache) (obj-cls proto)))
        (dcall (car (svref (obj-vals proto) (cache-a1 cache))) val)
        (cache-miss val obj cache))))

(defun %proto-lookup-m (val obj cache)
  (let ((cls (obj-cls obj)))
    (if (and (eq (cache-cls cache) cls)
             (eq (cache-a2 cache) (obj-cls (cls-prototype cls))))
        *not-found*
        (cache-miss val obj cache))))

(defun %proto-lookup-h (val obj cache)
  (let ((cls (obj-cls obj)))
    (if (eq (cache-cls cache) cls)
        (simple-lookup val (cls-prototype cls) (cache-prop cache))
        (cache-miss val obj cache))))

(defun %deep-lookup (val obj cache)
  (let* ((cls (obj-cls obj))
         (proto-cls (obj-cls (cls-prototype cls))))
    (if (and (eq (cache-cls cache) cls)
             (eq (cache-a2 cache) proto-cls))
        (simple-lookup val (cls-prototype proto-cls) (cache-prop cache))
        (cache-miss val obj cache))))

(defun meta-lookup (this obj prop)
  (macrolet ((ret (&rest vals) `(return-from meta-lookup (values ,@vals))))
    (let ((cls (obj-cls obj)) (vals (obj-vals obj)))
      (when (hash-table-p vals)
        (ret #'%direct-lookup-h nil nil (simple-lookup this obj prop)))
      (let ((slot (lookup-slot cls prop)))
        (when slot
          (if (logtest (cdr slot) +slot-active+)
              (ret #'%direct-lookup-d (car slot) nil (dcall (car (svref vals (car slot))) this))
              (ret #'%direct-lookup (car slot) nil (svref vals (car slot))))))
      (let ((proto (cls-prototype cls)))
        (unless proto (ret #'%direct-lookup-m nil nil *not-found*))
        (let ((proto-cls (obj-cls proto)) (proto-vals (obj-vals proto)))
          (when (hash-table-p proto-vals)
            (ret #'%proto-lookup-h nil nil (simple-lookup this proto prop)))
          (let ((slot (lookup-slot proto-cls prop)))
            (when slot
              (if (logtest (cdr slot) +slot-active+)
                  (ret #'%proto-lookup-d (car slot) proto-cls (dcall (car (svref proto-vals (car slot))) this))
                  (ret #'%proto-lookup (car slot) proto-cls (svref proto-vals (car slot))))))
          (let ((proto2 (cls-prototype proto-cls)))
            (unless proto2 (ret #'%proto-lookup-m nil proto-cls *not-found*))
            (ret #'%deep-lookup nil proto-cls (simple-lookup this proto2 prop))))))))

(defun expand-cached-lookup (obj prop)
  `(static-js-prop ,obj (load-time-value (make-cache (intern-prop ,prop)))))
(defmacro cached-lookup (obj prop)
  (expand-cached-lookup obj prop))

;; Writing

(defun update-class-and-set (obj new-cls slot val)
  (setf (obj-cls obj) new-cls)
  (unless (< slot (length (obj-vals obj)))
    (let ((vals (make-array (max 4 (* 2 (length (obj-vals obj)))))))
      (replace vals (obj-vals obj))
      (setf (obj-vals obj) vals)))
  (setf (svref (obj-vals obj) slot) val))

(defstruct (wcache (:constructor make-wcache (prop)))
  (op #'wcache-miss) cls prop slot a1)

(defun %simple-set (obj wcache val)
  (if (eq (obj-cls obj) (wcache-cls wcache))
      (setf (svref (obj-vals obj) (wcache-slot wcache)) val)
      (wcache-miss obj wcache val)))

(defun %active-set (obj wcache val)
  (if (eq (obj-cls obj) (wcache-cls wcache))
      (progn (dcall (wcache-a1 wcache) obj val) val)
      (wcache-miss obj wcache val)))

(defun %change-class-set (obj wcache val)
  (if (eq (obj-cls obj) (wcache-cls wcache))
      (update-class-and-set obj (wcache-a1 wcache) (wcache-slot wcache) val)
      (wcache-miss obj wcache val)))

(defun %ignored-set (obj wcache val)
  (if (eq (obj-cls obj) (wcache-cls wcache))
      val
      (wcache-miss obj wcache val)))

(defun %hash-set (obj wcache val)
  (if (hash-table-p (obj-vals obj))
      (hash-set obj (wcache-prop wcache) val)
      (wcache-miss obj wcache val)))

(defun %hash-then-set (obj wcache val)
  (if (eq (obj-cls obj) (wcache-cls wcache))
      (progn (hash-obj obj (scls-children (obj-cls obj)))
             (setf (gethash (wcache-prop wcache) (obj-vals obj)) (cons val +slot-dflt+))
             val)
      (wcache-miss obj wcache val)))

(defun hash-set (obj prop val)
  (let* ((table (obj-vals obj))
         (exists (gethash prop table)))
    (if exists
        (setf (car exists) val)
        ;; Check prototypes for read-only or active slots
        (if (let (curc curv hash slot)
              (loop :for cur := (cls-prototype (obj-cls obj)) :then (cls-prototype curc) :while cur :do
                 (setf curc (obj-cls cur) curv (obj-vals cur) hash (hash-table-p curv))
                 (setf slot (if hash (gethash prop curv) (lookup-slot curc prop)))
                 (when slot
                   (when (logtest (cdr slot) +slot-ro+) (return t))
                   (when (logtest (cdr slot) +slot-active+)
                     (let ((func (cdr (if hash (car slot) (svref curv (car slot))))))
                       (when func (dcall func obj val))
                       (return t)))
                   (return nil))))
            val
            (progn (setf (gethash prop table) (cons val +slot-dflt+)) val)))))

(defun wcache-miss (obj wcache val)
  (setf (wcache-cls wcache) (obj-cls obj))
  (multiple-value-bind (fn slot a1) (meta-set obj (wcache-prop wcache) val)
    (setf (wcache-op wcache) fn (wcache-slot wcache) slot (wcache-a1 wcache) a1)
    val))

;; This makes the assumption that the read-only flag of a property is
;; final, and doesn't change at runtime. If we add code to allow
;; twiddling of this flag, we can no longer cache the check.
(defun meta-set (obj prop val)
  (macrolet ((ret (&rest vals) `(return-from meta-set (values ,@vals))))
    (let ((cls (obj-cls obj)) (vals (obj-vals obj)))
      (when (hash-table-p vals)
        (hash-set obj prop val)
        (ret #'%hash-set))
      (let ((slot (lookup-slot cls prop)))
        (when slot
          (when (logtest (cdr slot) +slot-ro+)
            (ret #'%ignored-set))
          (when (logtest (cdr slot) +slot-active+)
            (let ((func (cdr (svref vals (car slot)))))
              (when func
                (dcall func obj val)
                (ret #'%active-set (car slot) func))
              (ret #'%ignored-set)))
          (setf (svref vals (car slot)) val)
          (ret #'%simple-set (car slot))))
      ;; Look for a read-only or active slot in prototypes
      (let (curc curv hash)
        (loop :for cur := (cls-prototype cls) :then (cls-prototype curc) :while cur :do
           (setf curc (obj-cls cur) curv (obj-vals cur) hash (hash-table-p curv))
           (let ((slot (if hash (gethash prop curv) (lookup-slot curc prop))))
             (when slot
               (when (logtest (cdr slot) +slot-ro+) (ret #'%ignored-set))
               (when (logtest (cdr slot) +slot-active+)
                 (let ((func (cdr (if hash (car slot) (svref curv (car slot))))))
                   (when func
                     (dcall func obj val)
                     (ret #'%active-set (car slot) func))
                   (ret #'%ignored-set)))
               (return)))))
      ;; No direct slot found yet, but can write. Add slot.
      (scls-add-slot obj cls prop val +slot-dflt+))))
  
(defun scls-add-slot (obj cls prop val flags)
  ;; Setting scls-children to a hash class means hash, using that class, when adding slots
  (unless (listp (scls-children cls))
    (hash-obj obj (scls-children cls))
    (setf (gethash prop (obj-vals obj)) (cons val flags))
    (return-from scls-add-slot #'%hash-then-set))
  (let ((new-cls (cdr (assoc prop (scls-children cls) :test #'eq))) slot)
    ;; We switch to a hash table if this class has 8 'exits' (probably
    ;; being used as a container), and it is not one of the reused classes.
    (when (and (not new-cls) (or (nthcdr 8 (scls-children cls)) (nthcdr 40 (scls-props cls)))
               (not (find cls (gobj-class-vec *env*) :test #'eq)))
      (setf (scls-children cls) (make-hcls (cls-prototype cls)))
      (hash-obj obj (scls-children cls))
      (setf (gethash prop (obj-vals obj)) (cons val flags))
      (return-from scls-add-slot #'%hash-then-set))
    (if new-cls
        (setf slot (lookup-slot new-cls prop))
        (progn
          (setf slot (cons (length (scls-props cls)) flags)
                new-cls (make-scls (cons (cons prop slot) (scls-props cls)) (cls-prototype cls)))
          (push (cons prop new-cls) (scls-children cls))))
    (update-class-and-set obj new-cls (car slot) val)
    (values #'%change-class-set (car slot) new-cls)))

(defun ensure-slot (obj prop val &optional (flags +slot-dflt+))
  (setf prop (intern-prop prop))
  (let ((vals (obj-vals obj)))
    (if (hash-table-p vals)
        (setf (gethash prop vals) (cons val flags))
        (let* ((cls (obj-cls obj)) (slot (lookup-slot cls prop)))
          (if slot
              (setf (svref (obj-vals obj) (car slot)) val)
              (scls-add-slot obj cls prop val flags))))))

(defmethod (setf static-js-prop) (val (obj obj) wcache)
  (funcall (the function (wcache-op wcache)) obj wcache val))
(defmethod (setf static-js-prop) (val obj wcache)
  (declare (ignore wcache val))
  (js-error :type-error "~a has no properties." (to-string obj)))

(defmethod (setf js-prop) (val (obj obj) prop)
  ;; Uses meta-set since the overhead isn't big, and duplicating all
  ;; that logic is error-prone.
  (meta-set obj (intern-prop (if (stringp prop) prop (to-string prop))) val)
  val)
(defmethod (setf js-prop) (val obj prop)
  (declare (ignore prop val))
  (js-error :type-error "~a has no properties." (to-string obj)))
;; TODO sparse storage, clever resizing
(defmethod (setf js-prop) (val (obj aobj) prop)
  (let ((index (index-in-range prop most-positive-fixnum)))
    (if index
        (let ((arr (aobj-arr obj)))
          (when (>= index (length arr))
            (adjust-array arr (1+ index) :fill-pointer (1+ index) :initial-element :undefined))
          (setf (aref arr index) val))
        (call-next-method val obj prop))))
(defmethod (setf js-prop) (val (obj argobj) prop)
  (let ((lst (argobj-list obj))
        (index (index-in-range prop (argobj-length obj))))
    (if index
        (setf (nth index lst) val)
        (call-next-method val obj prop))))

(defun expand-cached-set (obj prop val)
  `(setf (static-js-prop ,obj (load-time-value (make-wcache (intern-prop ,prop)))) ,val))
(defmacro cached-set (obj prop val)
  (expand-cached-set obj prop val))

;; Optimized global-object access

(define-condition undefined-variable (js-condition) ()) ;; TODO proper contents
(defun undefined-variable (name)
  (let ((err (make-js-error :reference-error "Undefined variable: ~a" name)))
    (error 'undefined-variable :value err)))

(defun gcache-lookup (gcache obj)
  (let ((slot (car gcache))
        (cache (cdr gcache)))
    (macrolet ((read-slot ()
                 `(if (logtest (cdr slot) +slot-active+)
                      (if (eq (car slot) :deleted)
                          (progn (setf (car gcache) nil)
                                 (return-from gcache-lookup (gcache-lookup gcache obj)))
                          (dcall (car slot) obj))
                      (car slot))))
      (cond (slot (read-slot))
            ((setf slot (gethash (cache-prop cache) (obj-vals obj)))
             (setf (car gcache) slot)
             (read-slot))
            (t (if-not-found (value (static-js-prop obj cache))
                 (undefined-variable (cache-prop cache))
                 value))))))

(defun expand-global-lookup (prop)
  `(gcache-lookup (load-time-value (cons nil (make-cache (intern-prop ,prop)))) ,*env*))

(defun global-lookup (prop)
  (if-not-found (value (js-prop *env* prop))
    (undefined-variable prop)
    value))

(defun gcache-set (gcache obj val)
  (let ((slot (car gcache))
        (prop (cdr gcache)))
    (when (cond (slot t)
                ((setf slot (gethash prop (obj-vals obj))) (setf (car gcache) slot))
                (t (hash-set obj prop val) nil))
      (cond ((logtest (cdr slot) +slot-active+)
             (if (eq (car slot) :deleted)
                 (progn (setf (car gcache) nil)
                        (return-from gcache-set (gcache-set gcache obj val)))
                 (when (cdar slot) (dcall (cdar slot) obj val))))
            ((not (logtest (cdr slot) +slot-ro+))
             (setf (car slot) val))))
    val))

(defun expand-global-set (prop val)
  `(gcache-set (load-time-value (cons nil (intern-prop ,prop))) ,*env* ,val))

;; Enumerating

(defmethod js-for-in ((obj obj) func &optional shallow)
  (let ((stack ()))
    (flet ((maybe-yield (flags name)
             (unless (or (logtest flags +slot-noenum+)
                         (dolist (parent stack)
                           (when (find-slot* parent name) (return t))))
               (funcall func name))))
      (let (cls vals)
        (loop :for cur := obj :then (and shallow (cls-prototype cls)) :while cur :do
           (setf cls (obj-cls cur) vals (obj-vals cur))
           (if (hash-table-p vals)
               (with-hash-table-iterator (next vals)
                 (loop (multiple-value-bind (more name val) (next)
                         (unless more (return))
                         (maybe-yield (cdr val) name))))
               (loop :for (name nil . flags) :in (scls-props cls) :do
                  (maybe-yield flags name)))
           (push cur stack))))))

(defmethod js-for-in ((obj aobj) func &optional shallow)
  (declare (ignore shallow))
  (dotimes (i (length (aobj-arr obj))) (funcall func (princ-to-string i)))
  (call-next-method))

(defmethod js-for-in ((obj argobj) func &optional shallow)
  (declare (ignore shallow))
  (dotimes (i (argobj-length obj)) (funcall func (princ-to-string i)))
  (call-next-method))

(defmethod js-for-in (obj func &optional shallow)
  (declare (ignore obj func shallow)))

;; Registering prototypes for string, number, and boolean values

(defmacro declare-primitive-prototype (specializer proto-id)
  `(progn
     (defmethod static-js-prop ((obj ,specializer) cache)
       (funcall (the function (cache-op cache)) obj (find-proto ,proto-id) cache))
     (defmethod js-prop ((obj ,specializer) prop)
       (do-lookup obj (find-proto ,proto-id) prop))
     (defmethod (setf static-js-prop) (val (obj ,specializer) wcache)
       (declare (ignore wcache))
       val)
     (defmethod (setf js-prop) (val (obj ,specializer) prop)
       (declare (ignore prop))
       val)
     (defmethod js-for-in ((obj ,specializer) func &optional shallow)
       (js-for-in (find-proto ,proto-id) func shallow))))

;; Utilities

(defun expand-static-obj (proto props)
  (let ((cls (gensym)))
    `(let ((,cls (load-time-value (make-scls ',(loop :for off :from 0 :for (name . val) :in props :collect
                                                  (list* (intern-prop name) off
                                                         (if (and (consp val) (eq (car val) :active))
                                                             +slot-active+ +slot-dflt+)))
                                             ,proto))))
       (make-obj ,cls (vector ,@(loop :for (nil . val) :in props :collect
                                   (if (and (consp val) (eq (car val) :active))
                                       `(cons ,(second val) ,(third val))
                                       val)))))))

(defun js-new (func &rest args)
  (unless (fobj-p func)
    (js-error :type-error "~a is not a constructor." (to-string func)))
  (let* ((cls (ensure-fobj-cls func))
         (this (if (cfobj-p func) (funcall (cfobj-make-new func) cls) (make-obj cls)))
         (result (apply (the function (proc func)) this args)))
    (if (obj-p result) result this)))

(defun ensure-fobj-cls (fobj)
  (let ((proto (js-prop fobj "prototype"))) ;; Active property in function prototype ensures this is always bound
    (unless (obj-p proto)
      (setf proto (js-obj))
      (setf (js-prop proto "constructor") fobj))
    (unless (and (fobj-new-cls fobj) (eq (cls-prototype (fobj-new-cls fobj)) proto))
      (setf (fobj-new-cls fobj) (make-scls () proto)))
    (fobj-new-cls fobj)))

(defun find-slot (obj prop)
  (find-slot* obj (intern-prop prop)))

(defun find-slot* (obj prop)
  (let ((vals (obj-vals obj)))
    (if (hash-table-p vals)
        (gethash prop vals)
        (lookup-slot (obj-cls obj) prop))))

(defun delete-prop (obj prop)
  (if (obj-p obj)
      (let ((slot (find-slot obj prop)))
        (cond ((not slot) t)
              ((logtest (cdr slot) +slot-nodel+) nil)
              (t (cond ((not (hash-table-p (obj-vals obj)))
                        (hash-obj obj (make-hcls (cls-prototype (obj-cls obj))))) ;; TODO reuse?
                       ((eq obj *env*) ;; Global slots can be cached, so we have to flag them as deleted
                        (setf (car slot) :deleted (cdr slot) +slot-active+)))
                 (remhash (intern-prop prop) (obj-vals obj)))))
      t))
Something went wrong with that request. Please try again.