src/compiler/ir1tran-lambda.lisp

   1 ;;;; This file contains code which does the translation of lambda
   2 ;;;; forms from Lisp code to the first intermediate representation
   3 ;;;; (IR1).
   4
   5 ;;;; This software is part of the SBCL system. See the README file for
   6 ;;;; more information.
   7 ;;;;
   8 ;;;; This software is derived from the CMU CL system, which was
   9 ;;;; written at Carnegie Mellon University and released into the
  10 ;;;; public domain. The software is in the public domain and is
  11 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  12 ;;;; files for more information.
  13
  14 (in-package "SB!C")
  15
  16 ;;;; LAMBDA hackery
  17
  18 ;;;; Note: Take a look at the compiler-overview.tex section on "Hairy
  19 ;;;; function representation" before you seriously mess with this
  20 ;;;; stuff.
  21
  22 ;;; Verify that the NAME is a legal name for a variable and return a
  23 ;;; VAR structure for it, filling in info if it is globally special.
  24 ;;; If it is losing, we punt with a COMPILER-ERROR. NAMES-SO-FAR is a
  25 ;;; list of names which have previously been bound. If the NAME is in
  26 ;;; this list, then we error out.
  27 (declaim (ftype (sfunction (t list) lambda-var) varify-lambda-arg))
  28 (defun varify-lambda-arg (name names-so-far)
  29   (declare (inline member))
  30   (unless (symbolp name)
  31     (compiler-error "The lambda variable ~S is not a symbol." name))
  32   (when (member name names-so-far :test #'eq)
  33     (compiler-error "The variable ~S occurs more than once in the lambda list."
  34                     name))
  35   (let ((kind (info :variable :kind name)))
  36     (cond ((or (keywordp name) (eq kind :constant))
  37            (compiler-error "The name of the lambda variable ~S is already in use to name a constant."
  38                            name))
  39           ((eq :global kind)
  40            (compiler-error "The name of the lambda variable ~S is already in use to name a global variable."
  41                            name)))
  42     (cond ((eq kind :special)
  43            (let ((specvar (find-free-var name)))
  44              (make-lambda-var :%source-name name
  45                               :type (leaf-type specvar)
  46                               :where-from (leaf-where-from specvar)
  47                               :specvar specvar)))
  48           (t
  49            (make-lambda-var :%source-name name)))))
  50
  51 ;;; Make the default keyword for a &KEY arg, checking that the keyword
  52 ;;; isn't already used by one of the VARS.
  53 (declaim (ftype (sfunction (symbol list t) symbol) make-keyword-for-arg))
  54 (defun make-keyword-for-arg (symbol vars keywordify)
  55   (let ((key (if (and keywordify (not (keywordp symbol)))
  56                  (keywordicate symbol)
  57                  symbol)))
  58     (dolist (var vars)
  59       (let ((info (lambda-var-arg-info var)))
  60         (when (and info
  61                    (eq (arg-info-kind info) :keyword)
  62                    (eq (arg-info-key info) key))
  63           (compiler-error
  64            "The keyword ~S appears more than once in the lambda list."
  65            key))))
  66     key))
  67
  68 ;;; Parse a lambda list into a list of VAR structures, stripping off
  69 ;;; any &AUX bindings. Each arg name is checked for legality, and
  70 ;;; duplicate names are checked for. If an arg is globally special,
  71 ;;; the var is marked as :SPECIAL instead of :LEXICAL. &KEY,
  72 ;;; &OPTIONAL and &REST args are annotated with an ARG-INFO structure
  73 ;;; which contains the extra information. If we hit something losing,
  74 ;;; we bug out with COMPILER-ERROR. These values are returned:
  75 ;;;  1. a list of the var structures for each top level argument;
  76 ;;;  2. a flag indicating whether &KEY was specified;
  77 ;;;  3. a flag indicating whether other &KEY args are allowed;
  78 ;;;  4. a list of the &AUX variables; and
  79 ;;;  5. a list of the &AUX values.
  80 (declaim (ftype (sfunction (list) (values list boolean boolean list list))
  81                 make-lambda-vars))
  82 (defun make-lambda-vars (list)
  83   (multiple-value-bind (required optional restp rest keyp keys allowp auxp aux
  84                         morep more-context more-count)
  85       (parse-lambda-list list)
  86     (declare (ignore auxp)) ; since we just iterate over AUX regardless
  87     (collect ((vars)
  88               (names-so-far)
  89               (aux-vars)
  90               (aux-vals))
  91       (flet (;; PARSE-DEFAULT deals with defaults and supplied-p args
  92              ;; for optionals and keywords args.
  93              (parse-default (spec info)
  94                (when (consp (cdr spec))
  95                  (setf (arg-info-default info) (second spec))
  96                  (when (consp (cddr spec))
  97                    (let* ((supplied-p (third spec))
  98                           (supplied-var (varify-lambda-arg supplied-p
  99                                                            (names-so-far))))
 100                      (setf (arg-info-supplied-p info) supplied-var)
 101                      (names-so-far supplied-p)
 102                      (when (> (length (the list spec)) 3)
 103                        (compiler-error
 104                         "The list ~S is too long to be an arg specifier."
 105                         spec)))))))
 106
 107         (dolist (name required)
 108           (let ((var (varify-lambda-arg name (names-so-far))))
 109             (vars var)
 110             (names-so-far name)))
 111
 112         (dolist (spec optional)
 113           (if (atom spec)
 114               (let ((var (varify-lambda-arg spec (names-so-far))))
 115                 (setf (lambda-var-arg-info var)
 116                       (make-arg-info :kind :optional))
 117                 (vars var)
 118                 (names-so-far spec))
 119               (let* ((name (first spec))
 120                      (var (varify-lambda-arg name (names-so-far)))
 121                      (info (make-arg-info :kind :optional)))
 122                 (setf (lambda-var-arg-info var) info)
 123                 (vars var)
 124                 (names-so-far name)
 125                 (parse-default spec info))))
 126
 127         (when restp
 128           (let ((var (varify-lambda-arg rest (names-so-far))))
 129             (setf (lambda-var-arg-info var) (make-arg-info :kind :rest))
 130             (vars var)
 131             (names-so-far rest)))
 132
 133         (when morep
 134           (let ((var (varify-lambda-arg more-context (names-so-far))))
 135             (setf (lambda-var-arg-info var)
 136                   (make-arg-info :kind :more-context))
 137             (vars var)
 138             (names-so-far more-context))
 139           (let ((var (varify-lambda-arg more-count (names-so-far))))
 140             (setf (lambda-var-arg-info var)
 141                   (make-arg-info :kind :more-count))
 142             (vars var)
 143             (names-so-far more-count)))
 144
 145         (dolist (spec keys)
 146           (cond
 147            ((atom spec)
 148             (let ((var (varify-lambda-arg spec (names-so-far))))
 149               (setf (lambda-var-arg-info var)
 150                     (make-arg-info :kind :keyword
 151                                    :key (make-keyword-for-arg spec
 152                                                               (vars)
 153                                                               t)))
 154               (vars var)
 155               (names-so-far spec)))
 156            ((atom (first spec))
 157             (let* ((name (first spec))
 158                    (var (varify-lambda-arg name (names-so-far)))
 159                    (info (make-arg-info
 160                           :kind :keyword
 161                           :key (make-keyword-for-arg name (vars) t))))
 162               (setf (lambda-var-arg-info var) info)
 163               (vars var)
 164               (names-so-far name)
 165               (parse-default spec info)))
 166            (t
 167             (let ((head (first spec)))
 168               (unless (proper-list-of-length-p head 2)
 169                 (error "malformed &KEY argument specifier: ~S" spec))
 170               (let* ((name (second head))
 171                      (var (varify-lambda-arg name (names-so-far)))
 172                      (info (make-arg-info
 173                             :kind :keyword
 174                             :key (make-keyword-for-arg (first head)
 175                                                        (vars)
 176                                                        nil))))
 177                 (setf (lambda-var-arg-info var) info)
 178                 (vars var)
 179                 (names-so-far name)
 180                 (parse-default spec info))))))
 181
 182         (dolist (spec aux)
 183           (cond ((atom spec)
 184                  (let ((var (varify-lambda-arg spec nil)))
 185                    (aux-vars var)
 186                    (aux-vals nil)
 187                    (names-so-far spec)))
 188                 (t
 189                  (unless (proper-list-of-length-p spec 1 2)
 190                    (compiler-error "malformed &AUX binding specifier: ~S"
 191                                    spec))
 192                  (let* ((name (first spec))
 193                         (var (varify-lambda-arg name nil)))
 194                    (aux-vars var)
 195                    (aux-vals (second spec))
 196                    (names-so-far name)))))
 197
 198         (values (vars) keyp allowp (aux-vars) (aux-vals))))))
 199
 200 ;;; This is similar to IR1-CONVERT-PROGN-BODY except that we
 201 ;;; sequentially bind each AUX-VAR to the corresponding AUX-VAL before
 202 ;;; converting the body. If there are no bindings, just convert the
 203 ;;; body, otherwise do one binding and recurse on the rest.
 204 ;;;
 205 ;;; FIXME: This could and probably should be converted to use
 206 ;;; SOURCE-NAME and DEBUG-NAME. But I (WHN) don't use &AUX bindings,
 207 ;;; so I'm not motivated. Patches will be accepted...
 208 (defun ir1-convert-aux-bindings (start next result body aux-vars aux-vals
 209                                  post-binding-lexenv)
 210   (declare (type ctran start next) (type (or lvar null) result)
 211            (list body aux-vars aux-vals))
 212   (if (null aux-vars)
 213       (let ((*lexenv* (make-lexenv :vars (copy-list post-binding-lexenv))))
 214         (ir1-convert-progn-body start next result body))
 215       (let ((ctran (make-ctran))
 216             (fun-lvar (make-lvar))
 217             (fun (ir1-convert-lambda-body body
 218                                           (list (first aux-vars))
 219                                           :aux-vars (rest aux-vars)
 220                                           :aux-vals (rest aux-vals)
 221                                           :post-binding-lexenv post-binding-lexenv
 222                                           :debug-name (debug-name
 223                                                        '&aux-bindings
 224                                                        aux-vars))))
 225         (reference-leaf start ctran fun-lvar fun)
 226         (ir1-convert-combination-args fun-lvar ctran next result
 227                                       (list (first aux-vals)))))
 228   (values))
 229
 230 ;;; This is similar to IR1-CONVERT-PROGN-BODY except that code to bind
 231 ;;; the SPECVAR for each SVAR to the value of the variable is wrapped
 232 ;;; around the body. If there are no special bindings, we just convert
 233 ;;; the body, otherwise we do one special binding and recurse on the
 234 ;;; rest.
 235 ;;;
 236 ;;; We make a cleanup and introduce it into the lexical
 237 ;;; environment. If there are multiple special bindings, the cleanup
 238 ;;; for the blocks will end up being the innermost one. We force NEXT
 239 ;;; to start a block outside of this cleanup, causing cleanup code to
 240 ;;; be emitted when the scope is exited.
 241 (defun ir1-convert-special-bindings
 242     (start next result body aux-vars aux-vals svars post-binding-lexenv)
 243   (declare (type ctran start next) (type (or lvar null) result)
 244            (list body aux-vars aux-vals svars))
 245   (cond
 246    ((null svars)
 247     (ir1-convert-aux-bindings start next result body aux-vars aux-vals
 248                               post-binding-lexenv))
 249    (t
 250     (ctran-starts-block next)
 251     (let ((cleanup (make-cleanup :kind :special-bind))
 252           (var (first svars))
 253           (bind-ctran (make-ctran))
 254           (cleanup-ctran (make-ctran)))
 255       (ir1-convert start bind-ctran nil
 256                    `(%special-bind ',(lambda-var-specvar var) ,var))
 257       (setf (cleanup-mess-up cleanup) (ctran-use bind-ctran))
 258       (let ((*lexenv* (make-lexenv :cleanup cleanup)))
 259         (ir1-convert bind-ctran cleanup-ctran nil '(%cleanup-point))
 260         (ir1-convert-special-bindings cleanup-ctran next result
 261                                       body aux-vars aux-vals
 262                                       (rest svars)
 263                                       post-binding-lexenv)))))
 264   (values))
 265
 266 ;;; Create a lambda node out of some code, returning the result. The
 267 ;;; bindings are specified by the list of VAR structures VARS. We deal
 268 ;;; with adding the names to the LEXENV-VARS for the conversion. The
 269 ;;; result is added to the NEW-FUNCTIONALS in the *CURRENT-COMPONENT*
 270 ;;; and linked to the component head and tail.
 271 ;;;
 272 ;;; We detect special bindings here, replacing the original VAR in the
 273 ;;; lambda list with a temporary variable. We then pass a list of the
 274 ;;; special vars to IR1-CONVERT-SPECIAL-BINDINGS, which actually emits
 275 ;;; the special binding code.
 276 ;;;
 277 ;;; We ignore any ARG-INFO in the VARS, trusting that someone else is
 278 ;;; dealing with &NONSENSE, except for &REST vars with DYNAMIC-EXTENT.
 279 ;;;
 280 ;;; AUX-VARS is a list of VAR structures for variables that are to be
 281 ;;; sequentially bound. Each AUX-VAL is a form that is to be evaluated
 282 ;;; to get the initial value for the corresponding AUX-VAR.
 283 (defun ir1-convert-lambda-body (body
 284                                 vars
 285                                 &key
 286                                 aux-vars
 287                                 aux-vals
 288                                 (source-name '.anonymous.)
 289                                 debug-name
 290                                 (note-lexical-bindings t)
 291                                 post-binding-lexenv
 292                                 system-lambda)
 293   (declare (list body vars aux-vars aux-vals))
 294
 295   ;; We're about to try to put new blocks into *CURRENT-COMPONENT*.
 296   (aver-live-component *current-component*)
 297
 298   (let* ((bind (make-bind))
 299          (lambda (make-lambda :vars vars
 300                   :bind bind
 301                   :%source-name source-name
 302                   :%debug-name debug-name
 303                   :system-lambda-p system-lambda))
 304          (result-ctran (make-ctran))
 305          (result-lvar (make-lvar)))
 306
 307     (awhen (lexenv-lambda *lexenv*)
 308       (push lambda (lambda-children it))
 309       (setf (lambda-parent lambda) it))
 310
 311     ;; just to check: This function should fail internal assertions if
 312     ;; we didn't set up a valid debug name above.
 313     ;;
 314     ;; (In SBCL we try to make everything have a debug name, since we
 315     ;; lack the omniscient perspective the original implementors used
 316     ;; to decide which things didn't need one.)
 317     (functional-debug-name lambda)
 318
 319     (setf (lambda-home lambda) lambda)
 320     (collect ((svars)
 321               (new-venv nil cons))
 322
 323       (dolist (var vars)
 324         ;; As far as I can see, LAMBDA-VAR-HOME should never have
 325         ;; been set before. Let's make sure. -- WHN 2001-09-29
 326         (aver (not (lambda-var-home var)))
 327         (setf (lambda-var-home var) lambda)
 328         (let ((specvar (lambda-var-specvar var)))
 329           (cond (specvar
 330                  (svars var)
 331                  (new-venv (cons (leaf-source-name specvar) specvar)))
 332                 (t
 333                  (when note-lexical-bindings
 334                    (note-lexical-binding (leaf-source-name var)))
 335                  (new-venv (cons (leaf-source-name var) var))))))
 336
 337       (let ((*lexenv* (make-lexenv :vars (new-venv)
 338                                    :lambda lambda
 339                                    :cleanup nil)))
 340         (setf (bind-lambda bind) lambda)
 341         (setf (node-lexenv bind) *lexenv*)
 342
 343         (let ((block (ctran-starts-block result-ctran)))
 344           (let ((return (make-return :result result-lvar :lambda lambda))
 345                 (tail-set (make-tail-set :funs (list lambda))))
 346             (setf (lambda-tail-set lambda) tail-set)
 347             (setf (lambda-return lambda) return)
 348             (setf (lvar-dest result-lvar) return)
 349             (link-node-to-previous-ctran return result-ctran)
 350             (setf (block-last block) return))
 351           (link-blocks block (component-tail *current-component*)))
 352
 353         (with-component-last-block (*current-component*
 354                                     (ctran-block result-ctran))
 355           (let ((prebind-ctran (make-ctran))
 356                 (postbind-ctran (make-ctran)))
 357             (ctran-starts-block prebind-ctran)
 358             (link-node-to-previous-ctran bind prebind-ctran)
 359             (use-ctran bind postbind-ctran)
 360             (ir1-convert-special-bindings postbind-ctran result-ctran
 361                                           result-lvar body
 362                                           aux-vars aux-vals (svars)
 363                                           post-binding-lexenv)))))
 364
 365     (link-blocks (component-head *current-component*) (node-block bind))
 366     (push lambda (component-new-functionals *current-component*))
 367
 368     lambda))
 369
 370 ;;; Entry point CLAMBDAs have a special kind
 371 (defun register-entry-point (entry dispatcher)
 372   (declare (type clambda entry)
 373            (type optional-dispatch dispatcher))
 374   (setf (functional-kind entry) :optional)
 375   (setf (leaf-ever-used entry) t)
 376   (setf (lambda-optional-dispatch entry) dispatcher)
 377   entry)
 378
 379 ;;; Create the actual entry-point function for an optional entry
 380 ;;; point. The lambda binds copies of each of the VARS, then calls FUN
 381 ;;; with the argument VALS and the DEFAULTS. Presumably the VALS refer
 382 ;;; to the VARS by name. The VALS are passed in the reverse order.
 383 ;;;
 384 ;;; If any of the copies of the vars are referenced more than once,
 385 ;;; then we mark the corresponding var as EVER-USED to inhibit
 386 ;;; "defined but not read" warnings for arguments that are only used
 387 ;;; by default forms.
 388 (defun convert-optional-entry (fun vars vals defaults name)
 389   (declare (type clambda fun) (list vars vals defaults))
 390   (let* ((fvars (reverse vars))
 391          (arg-vars (mapcar (lambda (var)
 392                              (make-lambda-var
 393                               :%source-name (leaf-source-name var)
 394                               :type (leaf-type var)
 395                               :where-from (leaf-where-from var)
 396                               :specvar (lambda-var-specvar var)))
 397                            fvars))
 398          (fun (collect ((default-bindings)
 399                         (default-vals))
 400                 (dolist (default defaults)
 401                   (if (sb!xc:constantp default)
 402                       (default-vals default)
 403                       (let ((var (gensym)))
 404                         (default-bindings `(,var ,default))
 405                         (default-vals var))))
 406                 (let ((bindings (default-bindings))
 407                       (call `(%funcall ,fun ,@(reverse vals) ,@(default-vals))))
 408                   (ir1-convert-lambda-body (if bindings
 409                                                `((let (,@bindings) ,call))
 410                                                `(,call))
 411                                           arg-vars
 412                                           ;; FIXME: Would be nice to
 413                                           ;; share these names instead
 414                                           ;; of consing up several
 415                                           ;; identical ones. Oh well.
 416                                           :debug-name (debug-name
 417                                                        '&optional-processor
 418                                                        name)
 419                                           :note-lexical-bindings nil
 420                                           :system-lambda t)))))
 421     (mapc (lambda (var arg-var)
 422             (when (cdr (leaf-refs arg-var))
 423               (setf (leaf-ever-used var) t)))
 424           fvars arg-vars)
 425     fun))
 426
 427 ;;; This function deals with supplied-p vars in optional arguments. If
 428 ;;; the there is no supplied-p arg, then we just call
 429 ;;; IR1-CONVERT-HAIRY-ARGS on the remaining arguments, and generate a
 430 ;;; optional entry that calls the result. If there is a supplied-p
 431 ;;; var, then we add it into the default vars and throw a T into the
 432 ;;; entry values. The resulting entry point function is returned.
 433 (defun generate-optional-default-entry (res default-vars default-vals
 434                                         entry-vars entry-vals
 435                                         vars supplied-p-p body
 436                                         aux-vars aux-vals
 437                                         source-name debug-name
 438                                         force post-binding-lexenv
 439                                         system-lambda)
 440   (declare (type optional-dispatch res)
 441            (list default-vars default-vals entry-vars entry-vals vars body
 442                  aux-vars aux-vals))
 443   (let* ((arg (first vars))
 444          (arg-name (leaf-source-name arg))
 445          (info (lambda-var-arg-info arg))
 446          (default (arg-info-default info))
 447          (supplied-p (arg-info-supplied-p info))
 448          (force (or force
 449                     (not (sb!xc:constantp (arg-info-default info)))))
 450          (ep (if supplied-p
 451                  (ir1-convert-hairy-args
 452                   res
 453                   (list* supplied-p arg default-vars)
 454                   (list* (leaf-source-name supplied-p) arg-name default-vals)
 455                   (cons arg entry-vars)
 456                   (list* t arg-name entry-vals)
 457                   (rest vars) t body aux-vars aux-vals
 458                   source-name debug-name
 459                   force post-binding-lexenv system-lambda)
 460                  (ir1-convert-hairy-args
 461                   res
 462                   (cons arg default-vars)
 463                   (cons arg-name default-vals)
 464                   (cons arg entry-vars)
 465                   (cons arg-name entry-vals)
 466                   (rest vars) supplied-p-p body aux-vars aux-vals
 467                   source-name debug-name
 468                   force post-binding-lexenv system-lambda))))
 469
 470     ;; We want to delay converting the entry, but there exist
 471     ;; problems: hidden references should not be established to
 472     ;; lambdas of kind NIL should not have (otherwise the compiler
 473     ;; might let-convert or delete them) and to variables.
 474     (let ((name (or debug-name source-name)))
 475       (if (or force
 476               supplied-p-p ; this entry will be of kind NIL
 477               (and (lambda-p ep) (eq (lambda-kind ep) nil)))
 478           (convert-optional-entry ep
 479                                   default-vars default-vals
 480                                   (if supplied-p (list default nil) (list default))
 481                                   name)
 482           (let* ((default `',(constant-form-value default))
 483                  (defaults (if supplied-p (list default nil) (list default))))
 484             ;; DEFAULT can contain a reference to a
 485             ;; to-be-optimized-away function/block/tag, so better to
 486             ;; reduce code now (but we possibly lose syntax checking
 487             ;; in an unreachable code).
 488             (delay
 489              (register-entry-point
 490               (convert-optional-entry (force ep)
 491                                       default-vars default-vals
 492                                       defaults
 493                                       name)
 494               res)))))))
 495
 496 ;;; Create the MORE-ENTRY function for the OPTIONAL-DISPATCH RES.
 497 ;;; ENTRY-VARS and ENTRY-VALS describe the fixed arguments. REST is
 498 ;;; the var for any &REST arg. KEYS is a list of the &KEY arg vars.
 499 ;;;
 500 ;;; The most interesting thing that we do is parse keywords. We create
 501 ;;; a bunch of temporary variables to hold the result of the parse,
 502 ;;; and then loop over the supplied arguments, setting the appropriate
 503 ;;; temps for the supplied keyword. Note that it is significant that
 504 ;;; we iterate over the keywords in reverse order --- this implements
 505 ;;; the CL requirement that (when a keyword appears more than once)
 506 ;;; the first value is used.
 507 ;;;
 508 ;;; If there is no supplied-p var, then we initialize the temp to the
 509 ;;; default and just pass the temp into the main entry. Since
 510 ;;; non-constant &KEY args are forcibly given a supplied-p var, we
 511 ;;; know that the default is constant, and thus safe to evaluate out
 512 ;;; of order.
 513 ;;;
 514 ;;; If there is a supplied-p var, then we create temps for both the
 515 ;;; value and the supplied-p, and pass them into the main entry,
 516 ;;; letting it worry about defaulting.
 517 ;;;
 518 ;;; We deal with :ALLOW-OTHER-KEYS by delaying unknown keyword errors
 519 ;;; until we have scanned all the keywords.
 520 (defun convert-more-entry (res entry-vars entry-vals rest morep keys name)
 521   (declare (type optional-dispatch res) (list entry-vars entry-vals keys))
 522   (collect ((arg-vars)
 523             (arg-vals (reverse entry-vals))
 524             (temps)
 525             (body))
 526
 527     (dolist (var (reverse entry-vars))
 528       (arg-vars (make-lambda-var :%source-name (leaf-source-name var)
 529                                  :type (leaf-type var)
 530                                  :where-from (leaf-where-from var))))
 531
 532     (let* ((n-context (gensym "N-CONTEXT-"))
 533            (context-temp (make-lambda-var :%source-name n-context))
 534            (n-count (gensym "N-COUNT-"))
 535            (count-temp (make-lambda-var :%source-name n-count
 536                                         :type (specifier-type 'index))))
 537
 538       (arg-vars context-temp count-temp)
 539
 540       (when rest
 541         (arg-vals `(%listify-rest-args
 542                     ,n-context ,n-count)))
 543       (when morep
 544         (arg-vals n-context)
 545         (arg-vals n-count))
 546
 547       ;; The reason for all the noise with
 548       ;; STACK-GROWS-DOWNWARD-NOT-UPWARD is to enable generation of
 549       ;; slightly more efficient code on x86oid processors.  (We can
 550       ;; hoist the negation of the index outside the main parsing loop
 551       ;; and take advantage of the base+index+displacement addressing
 552       ;; mode on x86oids.)
 553       (when (optional-dispatch-keyp res)
 554         (let ((n-index (gensym "N-INDEX-"))
 555               (n-key (gensym "N-KEY-"))
 556               (n-value-temp (gensym "N-VALUE-TEMP-"))
 557               (n-allowp (gensym "N-ALLOWP-"))
 558               (n-losep (gensym "N-LOSEP-"))
 559               (allowp (or (optional-dispatch-allowp res)
 560                           (policy *lexenv* (zerop safety))))
 561               (found-allow-p nil))
 562
 563           (temps #!-stack-grows-downward-not-upward
 564                  `(,n-index (1- ,n-count))
 565                  #!+stack-grows-downward-not-upward
 566                  `(,n-index (- (1- ,n-count)))
 567                  #!-stack-grows-downward-not-upward n-value-temp
 568                  #!-stack-grows-downward-not-upward n-key)
 569           (body `(declare (fixnum ,n-index)
 570                           #!-stack-grows-downward-not-upward
 571                           (ignorable ,n-value-temp ,n-key)))
 572
 573           (collect ((tests))
 574             (dolist (key keys)
 575               (let* ((info (lambda-var-arg-info key))
 576                      (default (arg-info-default info))
 577                      (keyword (arg-info-key info))
 578                      (supplied-p (arg-info-supplied-p info))
 579                      (n-value (gensym "N-VALUE-"))
 580                      (clause (cond (supplied-p
 581                                     (let ((n-supplied (gensym "N-SUPPLIED-")))
 582                                       (temps n-supplied)
 583                                       (arg-vals n-value n-supplied)
 584                                       `((eq ,n-key ',keyword)
 585                                         (setq ,n-supplied t)
 586                                         (setq ,n-value ,n-value-temp))))
 587                                    (t
 588                                     (arg-vals n-value)
 589                                     `((eq ,n-key ',keyword)
 590                                       (setq ,n-value ,n-value-temp))))))
 591                 (when (and (not allowp) (eq keyword :allow-other-keys))
 592                   (setq found-allow-p t)
 593                   (setq clause
 594                         (append clause `((setq ,n-allowp ,n-value-temp)))))
 595
 596                 (temps `(,n-value ,default))
 597                 (tests clause)))
 598
 599             (unless allowp
 600               (temps n-allowp n-losep)
 601               (unless found-allow-p
 602                 (tests `((eq ,n-key :allow-other-keys)
 603                          (setq ,n-allowp ,n-value-temp))))
 604               (tests `(t
 605                        (setq ,n-losep (list ,n-key)))))
 606
 607             (body
 608              `(when (oddp ,n-count)
 609                 (%odd-key-args-error)))
 610
 611             (body
 612              #!-stack-grows-downward-not-upward
 613              `(locally
 614                 (declare (optimize (safety 0)))
 615                 (loop
 616                   (when (minusp ,n-index) (return))
 617                   (setf ,n-value-temp (%more-arg ,n-context ,n-index))
 618                   (decf ,n-index)
 619                   (setq ,n-key (%more-arg ,n-context ,n-index))
 620                   (decf ,n-index)
 621                   (cond ,@(tests))))
 622              #!+stack-grows-downward-not-upward
 623              `(locally (declare (optimize (safety 0)))
 624                 (loop
 625                   (when (plusp ,n-index) (return))
 626                   (multiple-value-bind (,n-value-temp ,n-key)
 627                       (%more-kw-arg ,n-context ,n-index)
 628                     (declare (ignorable ,n-value-temp ,n-key))
 629                     (incf ,n-index 2)
 630                     (cond ,@(tests))))))
 631
 632             (unless allowp
 633               (body `(when (and ,n-losep (not ,n-allowp))
 634                        (%unknown-key-arg-error (car ,n-losep))))))))
 635
 636       (let ((ep (ir1-convert-lambda-body
 637                  `((let ,(temps)
 638                      ,@(body)
 639                      (%funcall ,(optional-dispatch-main-entry res)
 640                                ,@(arg-vals))))
 641                  (arg-vars)
 642                  :debug-name (debug-name '&more-processor name)
 643                  :note-lexical-bindings nil
 644                  :system-lambda t)))
 645         (setf (optional-dispatch-more-entry res)
 646               (register-entry-point ep res)))))
 647
 648   (values))
 649
 650 ;;; This is called by IR1-CONVERT-HAIRY-ARGS when we run into a &REST
 651 ;;; or &KEY arg. The arguments are similar to that function, but we
 652 ;;; split off any &REST arg and pass it in separately. REST is the
 653 ;;; &REST arg var, or NIL if there is no &REST arg. KEYS is a list of
 654 ;;; the &KEY argument vars.
 655 ;;;
 656 ;;; When there are &KEY arguments, we introduce temporary gensym
 657 ;;; variables to hold the values while keyword defaulting is in
 658 ;;; progress to get the required sequential binding semantics.
 659 ;;;
 660 ;;; This gets interesting mainly when there are &KEY arguments with
 661 ;;; supplied-p vars or non-constant defaults. In either case, pass in
 662 ;;; a supplied-p var. If the default is non-constant, we introduce an
 663 ;;; IF in the main entry that tests the supplied-p var and decides
 664 ;;; whether to evaluate the default or not. In this case, the real
 665 ;;; incoming value is NIL, so we must union NULL with the declared
 666 ;;; type when computing the type for the main entry's argument.
 667 (defun ir1-convert-more (res default-vars default-vals entry-vars entry-vals
 668                          rest more-context more-count keys supplied-p-p
 669                          body aux-vars aux-vals source-name debug-name
 670                          post-binding-lexenv system-lambda)
 671   (declare (type optional-dispatch res)
 672            (list default-vars default-vals entry-vars entry-vals keys body
 673                  aux-vars aux-vals))
 674   (collect ((main-vars (reverse default-vars))
 675             (main-vals default-vals cons)
 676             (bind-vars)
 677             (bind-vals))
 678     (when rest
 679       (main-vars rest)
 680       (main-vals '()))
 681     (when more-context
 682       (main-vars more-context)
 683       (main-vals nil)
 684       (main-vars more-count)
 685       (main-vals 0))
 686
 687     (dolist (key keys)
 688       (let* ((info (lambda-var-arg-info key))
 689              (default (arg-info-default info))
 690              (hairy-default (not (sb!xc:constantp default)))
 691              (supplied-p (arg-info-supplied-p info))
 692              (n-val (make-symbol (format nil
 693                                          "~A-DEFAULTING-TEMP"
 694                                          (leaf-source-name key))))
 695              (val-temp (make-lambda-var :%source-name n-val)))
 696         (main-vars val-temp)
 697         (bind-vars key)
 698         (cond ((or hairy-default supplied-p)
 699                (let* ((n-supplied (gensym "N-SUPPLIED-"))
 700                       (supplied-temp (make-lambda-var
 701                                       :%source-name n-supplied)))
 702                  (unless supplied-p
 703                    (setf (arg-info-supplied-p info) supplied-temp))
 704                  (when hairy-default
 705                    (setf (arg-info-default info) nil))
 706                  (main-vars supplied-temp)
 707                  (cond (hairy-default
 708                         (main-vals nil nil)
 709                         (bind-vals `(if ,n-supplied ,n-val ,default)))
 710                        (t
 711                         (main-vals default nil)
 712                         (bind-vals n-val)))
 713                  (when supplied-p
 714                    (bind-vars supplied-p)
 715                    (bind-vals n-supplied))))
 716               (t
 717                (main-vals (arg-info-default info))
 718                (bind-vals n-val)))))
 719
 720     (let* ((name (or debug-name source-name))
 721            (main-entry (ir1-convert-lambda-body
 722                         body (main-vars)
 723                         :aux-vars (append (bind-vars) aux-vars)
 724                         :aux-vals (append (bind-vals) aux-vals)
 725                         :post-binding-lexenv post-binding-lexenv
 726                         :debug-name (debug-name 'varargs-entry name)
 727                         :system-lambda system-lambda))
 728            (last-entry (convert-optional-entry main-entry default-vars
 729                                                (main-vals) () name)))
 730       (setf (optional-dispatch-main-entry res)
 731             (register-entry-point main-entry res))
 732       (convert-more-entry res entry-vars entry-vals rest more-context keys
 733                           name)
 734
 735       (push (register-entry-point
 736              (if supplied-p-p
 737                 (convert-optional-entry last-entry entry-vars entry-vals
 738                                         () name)
 739                 last-entry)
 740              res)
 741             (optional-dispatch-entry-points res))
 742       last-entry)))
 743
 744 ;;; This function generates the entry point functions for the
 745 ;;; OPTIONAL-DISPATCH RES. We accomplish this by recursion on the list
 746 ;;; of arguments, analyzing the arglist on the way down and generating
 747 ;;; entry points on the way up.
 748 ;;;
 749 ;;; DEFAULT-VARS is a reversed list of all the argument vars processed
 750 ;;; so far, including supplied-p vars. DEFAULT-VALS is a list of the
 751 ;;; names of the DEFAULT-VARS.
 752 ;;;
 753 ;;; ENTRY-VARS is a reversed list of processed argument vars,
 754 ;;; excluding supplied-p vars. ENTRY-VALS is a list things that can be
 755 ;;; evaluated to get the values for all the vars from the ENTRY-VARS.
 756 ;;; It has the var name for each required or optional arg, and has T
 757 ;;; for each supplied-p arg.
 758 ;;;
 759 ;;; VARS is a list of the LAMBDA-VAR structures for arguments that
 760 ;;; haven't been processed yet. SUPPLIED-P-P is true if a supplied-p
 761 ;;; argument has already been processed; only in this case are the
 762 ;;; DEFAULT-XXX and ENTRY-XXX different.
 763 ;;;
 764 ;;; The result at each point is a lambda which should be called by the
 765 ;;; above level to default the remaining arguments and evaluate the
 766 ;;; body. We cause the body to be evaluated by converting it and
 767 ;;; returning it as the result when the recursion bottoms out.
 768 ;;;
 769 ;;; Each level in the recursion also adds its entry point function to
 770 ;;; the result OPTIONAL-DISPATCH. For most arguments, the defaulting
 771 ;;; function and the entry point function will be the same, but when
 772 ;;; SUPPLIED-P args are present they may be different.
 773 ;;;
 774 ;;; When we run into a &REST or &KEY arg, we punt out to
 775 ;;; IR1-CONVERT-MORE, which finishes for us in this case.
 776 (defun ir1-convert-hairy-args (res default-vars default-vals
 777                                entry-vars entry-vals
 778                                vars supplied-p-p body aux-vars
 779                                aux-vals
 780                                source-name debug-name
 781                                force post-binding-lexenv
 782                                system-lambda)
 783   (declare (type optional-dispatch res)
 784            (list default-vars default-vals entry-vars entry-vals vars body
 785                  aux-vars aux-vals))
 786   (aver (or debug-name (neq '.anonymous. source-name)))
 787   (cond ((not vars)
 788          (if (optional-dispatch-keyp res)
 789              ;; Handle &KEY with no keys...
 790              (ir1-convert-more res default-vars default-vals
 791                                entry-vars entry-vals
 792                                nil nil nil vars supplied-p-p body aux-vars
 793                                aux-vals source-name debug-name
 794                                post-binding-lexenv system-lambda)
 795              (let* ((name (or debug-name source-name))
 796                     (fun (ir1-convert-lambda-body
 797                          body (reverse default-vars)
 798                          :aux-vars aux-vars
 799                          :aux-vals aux-vals
 800                          :post-binding-lexenv post-binding-lexenv
 801                          :debug-name (debug-name 'hairy-arg-processor name)
 802                          :system-lambda system-lambda)))
 803
 804                (setf (optional-dispatch-main-entry res) fun)
 805                (register-entry-point fun res)
 806                (push (if supplied-p-p
 807                          (register-entry-point
 808                           (convert-optional-entry fun entry-vars entry-vals ()
 809                                                   name)
 810                           res)
 811                           fun)
 812                      (optional-dispatch-entry-points res))
 813                fun)))
 814         ((not (lambda-var-arg-info (first vars)))
 815          (let* ((arg (first vars))
 816                 (nvars (cons arg default-vars))
 817                 (nvals (cons (leaf-source-name arg) default-vals)))
 818            (ir1-convert-hairy-args res nvars nvals nvars nvals
 819                                    (rest vars) nil body aux-vars aux-vals
 820                                    source-name debug-name
 821                                    nil post-binding-lexenv system-lambda)))
 822         (t
 823          (let* ((arg (first vars))
 824                 (info (lambda-var-arg-info arg))
 825                 (kind (arg-info-kind info)))
 826            (ecase kind
 827              (:optional
 828               (let ((ep (generate-optional-default-entry
 829                          res default-vars default-vals
 830                          entry-vars entry-vals vars supplied-p-p body
 831                          aux-vars aux-vals
 832                          source-name debug-name
 833                          force post-binding-lexenv
 834                          system-lambda)))
 835                 ;; See GENERATE-OPTIONAL-DEFAULT-ENTRY.
 836                 (push (if (lambda-p ep)
 837                           (register-entry-point
 838                            (if supplied-p-p
 839                                (convert-optional-entry
 840                                 ep entry-vars entry-vals nil
 841                                 (or debug-name source-name))
 842                                ep)
 843                            res)
 844                           (progn (aver (not supplied-p-p))
 845                                  ep))
 846                       (optional-dispatch-entry-points res))
 847                 ep))
 848              (:rest
 849               (ir1-convert-more res default-vars default-vals
 850                                 entry-vars entry-vals
 851                                 arg nil nil (rest vars) supplied-p-p body
 852                                 aux-vars aux-vals
 853                                 source-name debug-name
 854                                 post-binding-lexenv system-lambda))
 855              (:more-context
 856               (ir1-convert-more res default-vars default-vals
 857                                 entry-vars entry-vals
 858                                 nil arg (second vars) (cddr vars) supplied-p-p
 859                                 body aux-vars aux-vals
 860                                 source-name debug-name
 861                                 post-binding-lexenv system-lambda))
 862              (:keyword
 863               (ir1-convert-more res default-vars default-vals
 864                                 entry-vars entry-vals
 865                                 nil nil nil vars supplied-p-p body aux-vars
 866                                 aux-vals source-name debug-name
 867                                 post-binding-lexenv system-lambda)))))))
 868
 869 ;;; This function deals with the case where we have to make an
 870 ;;; OPTIONAL-DISPATCH to represent a LAMBDA. We cons up the result and
 871 ;;; call IR1-CONVERT-HAIRY-ARGS to do the work. When it is done, we
 872 ;;; figure out the MIN-ARGS and MAX-ARGS.
 873 (defun ir1-convert-hairy-lambda (body vars keyp allowp aux-vars aux-vals
 874                                  &key post-binding-lexenv
 875                                  (source-name '.anonymous.)
 876                                  debug-name system-lambda)
 877   (declare (list body vars aux-vars aux-vals))
 878   (aver (or debug-name (neq '.anonymous. source-name)))
 879   (let ((res (make-optional-dispatch :arglist vars
 880                                      :allowp allowp
 881                                      :keyp keyp
 882                                      :%source-name source-name
 883                                      :%debug-name debug-name
 884                                      :plist `(:ir1-environment
 885                                               (,*lexenv*
 886                                                ,*current-path*))))
 887         (min (or (position-if #'lambda-var-arg-info vars) (length vars))))
 888     (aver-live-component *current-component*)
 889     (push res (component-new-functionals *current-component*))
 890     (ir1-convert-hairy-args res () () () () vars nil body aux-vars aux-vals
 891                             source-name debug-name nil post-binding-lexenv
 892                             system-lambda)
 893     (setf (optional-dispatch-min-args res) min)
 894     (setf (optional-dispatch-max-args res)
 895           (+ (1- (length (optional-dispatch-entry-points res))) min))
 896
 897     res))
 898
 899 ;;; Convert a LAMBDA form into a LAMBDA leaf or an OPTIONAL-DISPATCH leaf.
 900 (defun ir1-convert-lambda (form &key (source-name '.anonymous.)
 901                            debug-name maybe-add-debug-catch
 902                            system-lambda)
 903   (unless (consp form)
 904     (compiler-error "A ~S was found when expecting a lambda expression:~%  ~S"
 905                     (type-of form)
 906                     form))
 907   (unless (eq (car form) 'lambda)
 908     (compiler-error "~S was expected but ~S was found:~%  ~S"
 909                     'lambda
 910                     (car form)
 911                     form))
 912   (unless (and (consp (cdr form)) (listp (cadr form)))
 913     (compiler-error
 914      "The lambda expression has a missing or non-list lambda list:~%  ~S"
 915      form))
 916   (when (and system-lambda maybe-add-debug-catch)
 917     (bug "Both SYSTEM-LAMBDA and MAYBE-ADD-DEBUG-CATCH specified"))
 918   (unless (or debug-name (neq '.anonymous. source-name))
 919     (setf debug-name (name-lambdalike form)))
 920   (multiple-value-bind (vars keyp allow-other-keys aux-vars aux-vals)
 921       (make-lambda-vars (cadr form))
 922     (multiple-value-bind (forms decls doc) (parse-body (cddr form))
 923       (binding* (((*lexenv* result-type post-binding-lexenv)
 924                   (process-decls decls (append aux-vars vars) nil
 925                                  :binding-form-p t))
 926                  (debug-catch-p (and maybe-add-debug-catch
 927                                      *allow-instrumenting*
 928                                      (policy *lexenv*
 929                                              (>= insert-debug-catch 2))))
 930                  (forms (if debug-catch-p
 931                             (wrap-forms-in-debug-catch forms)
 932                             forms))
 933                  (forms (if (eq result-type *wild-type*)
 934                             forms
 935                             `((the ,result-type (progn ,@forms)))))
 936                  (*allow-instrumenting* (and (not system-lambda) *allow-instrumenting*))
 937                  (res (cond ((or (find-if #'lambda-var-arg-info vars) keyp)
 938                              (ir1-convert-hairy-lambda forms vars keyp
 939                                                        allow-other-keys
 940                                                        aux-vars aux-vals
 941                                                        :post-binding-lexenv post-binding-lexenv
 942                                                        :source-name source-name
 943                                                        :debug-name debug-name
 944                                                        :system-lambda system-lambda))
 945                             (t
 946                              (ir1-convert-lambda-body forms vars
 947                                                       :aux-vars aux-vars
 948                                                       :aux-vals aux-vals
 949                                                       :post-binding-lexenv post-binding-lexenv
 950                                                       :source-name source-name
 951                                                       :debug-name debug-name
 952                                                       :system-lambda system-lambda)))))
 953         (setf (functional-inline-expansion res) form)
 954         (setf (functional-arg-documentation res) (cadr form))
 955         (setf (functional-documentation res) doc)
 956         (when (boundp '*lambda-conversions*)
 957           ;; KLUDGE: Not counting TL-XEPs is a lie, of course, but
 958           ;; keeps things less confusing to users of TIME, where this
 959           ;; count gets used.
 960           (unless (and (consp debug-name) (eq 'tl-xep (car debug-name)))
 961             (incf *lambda-conversions*)))
 962         res))))
 963
 964 (defun wrap-forms-in-debug-catch (forms)
 965   #!+unwind-to-frame-and-call-vop
 966   `((multiple-value-prog1
 967       (progn
 968         ,@forms)
 969       ;; Just ensure that there won't be any tail-calls, IR2 magic will
 970       ;; handle the rest.
 971       (values)))
 972   #!-unwind-to-frame-and-call-vop
 973   `( ;; Normally, we'll return from this block with the below RETURN-FROM.
 974     (block
 975         return-value-tag
 976       ;; If DEBUG-CATCH-TAG is thrown (with a thunk as the value) the
 977       ;; RETURN-FROM is elided and we funcall the thunk instead. That
 978       ;; thunk might either return a value (for a RETURN-FROM-FRAME)
 979       ;; or call this same function again (for a RESTART-FRAME).
 980       ;; -- JES, 2007-01-09
 981       (funcall
 982        (the function
 983          ;; Use a constant catch tag instead of consing a new one for every
 984          ;; entry to this block. The uniquencess of the catch tags is
 985          ;; ensured when the tag is throw by the debugger. It'll allocate a
 986          ;; new tag, and modify the reference this tag in the proper
 987          ;; catch-block structure to refer to that new tag. This
 988          ;; significantly decreases the runtime cost of high debug levels.
 989          ;;  -- JES, 2007-01-09
 990          (catch 'debug-catch-tag
 991            (return-from return-value-tag
 992              (progn
 993                ,@forms))))))))
 994
 995 ;;; helper for LAMBDA-like things, to massage them into a form
 996 ;;; suitable for IR1-CONVERT-LAMBDA.
 997 (defun ir1-convert-lambdalike (thing
 998                                &key
 999                                (source-name '.anonymous.)
1000                                debug-name)
1001   (when (and (not debug-name) (eq '.anonymous. source-name))
1002     (setf debug-name (name-lambdalike thing)))
1003   (ecase (car thing)
1004     ((lambda)
1005      (ir1-convert-lambda thing
1006                          :maybe-add-debug-catch t
1007                          :source-name source-name
1008                          :debug-name debug-name))
1009     ((instance-lambda)
1010      (deprecation-warning 'instance-lambda 'lambda)
1011      (ir1-convert-lambda `(lambda ,@(cdr thing))
1012                          :source-name source-name
1013                          :debug-name debug-name))
1014     ((named-lambda)
1015      (let ((name (cadr thing))
1016            (lambda-expression `(lambda ,@(cddr thing))))
1017        (if (and name (legal-fun-name-p name))
1018            (let ((defined-fun-res (get-defined-fun name))
1019                  (res (ir1-convert-lambda lambda-expression
1020                                           :maybe-add-debug-catch t
1021                                           :source-name name)))
1022              (assert-global-function-definition-type name res)
1023              (push res (defined-fun-functionals defined-fun-res))
1024              (unless (eq (defined-fun-inlinep defined-fun-res) :notinline)
1025                (substitute-leaf-if
1026                 (lambda (ref)
1027                   (policy ref (> recognize-self-calls 0)))
1028                 res defined-fun-res))
1029              res)
1030            (ir1-convert-lambda lambda-expression
1031                                :maybe-add-debug-catch t
1032                                :debug-name
1033                                (or name (name-lambdalike thing))))))
1034     ((lambda-with-lexenv)
1035      (ir1-convert-inline-lambda thing
1036                                 :source-name source-name
1037                                 :debug-name debug-name))))
1038 \f
1039 ;;;; defining global functions
1040
1041 ;;; Convert FUN as a lambda in the null environment, but use the
1042 ;;; current compilation policy. Note that FUN may be a
1043 ;;; LAMBDA-WITH-LEXENV, so we may have to augment the environment to
1044 ;;; reflect the state at the definition site.
1045 (defun ir1-convert-inline-lambda (fun
1046                                   &key
1047                                   (source-name '.anonymous.)
1048                                   debug-name
1049                                   system-lambda)
1050   (when (and (not debug-name) (eq '.anonymous. source-name))
1051     (setf debug-name (name-lambdalike fun)))
1052   (destructuring-bind (decls macros symbol-macros &rest body)
1053       (if (eq (car fun) 'lambda-with-lexenv)
1054           (cdr fun)
1055           `(() () () . ,(cdr fun)))
1056     (let* ((*lexenv* (make-lexenv
1057                       :default (process-decls decls nil nil
1058                                               :lexenv (make-null-lexenv))
1059                       :vars (copy-list symbol-macros)
1060                       :funs (mapcar (lambda (x)
1061                                       `(,(car x) .
1062                                          (macro . ,(coerce (cdr x) 'function))))
1063                                     macros)
1064                       ;; Inherit MUFFLE-CONDITIONS from the call-site lexenv
1065                       ;; rather than the definition-site lexenv, since it seems
1066                       ;; like a much more common case.
1067                       :handled-conditions (lexenv-handled-conditions *lexenv*)
1068                       :policy (lexenv-policy *lexenv*)))
1069            (clambda (ir1-convert-lambda `(lambda ,@body)
1070                                         :source-name source-name
1071                                         :debug-name debug-name
1072                                         :system-lambda system-lambda)))
1073       (setf (functional-inline-expanded clambda) t)
1074       clambda)))
1075
1076 ;;; Get a DEFINED-FUN object for a function we are about to define. If
1077 ;;; the function has been forward referenced, then substitute for the
1078 ;;; previous references.
1079 (defun get-defined-fun (name)
1080   (proclaim-as-fun-name name)
1081   (let ((found (find-free-fun name "shouldn't happen! (defined-fun)")))
1082     (note-name-defined name :function)
1083     (cond ((not (defined-fun-p found))
1084            (aver (not (info :function :inlinep name)))
1085            (let* ((where-from (leaf-where-from found))
1086                   (res (make-defined-fun
1087                         :%source-name name
1088                         :where-from (if (eq where-from :declared)
1089                                         :declared :defined)
1090                         :type (leaf-type found))))
1091              (substitute-leaf res found)
1092              (setf (gethash name *free-funs*) res)))
1093           ;; If *FREE-FUNS* has a previously converted definition
1094           ;; for this name, then blow it away and try again.
1095           ((defined-fun-functionals found)
1096            (remhash name *free-funs*)
1097            (get-defined-fun name))
1098           (t found))))
1099
1100 ;;; Check a new global function definition for consistency with
1101 ;;; previous declaration or definition, and assert argument/result
1102 ;;; types if appropriate. This assertion is suppressed by the
1103 ;;; EXPLICIT-CHECK attribute, which is specified on functions that
1104 ;;; check their argument types as a consequence of type dispatching.
1105 ;;; This avoids redundant checks such as NUMBERP on the args to +, etc.
1106 (defun assert-new-definition (var fun)
1107   (let ((type (leaf-type var))
1108         (for-real (eq (leaf-where-from var) :declared))
1109         (info (info :function :info (leaf-source-name var))))
1110     (assert-definition-type
1111      fun type
1112      ;; KLUDGE: Common Lisp is such a dynamic language that in general
1113      ;; all we can do here in general is issue a STYLE-WARNING. It
1114      ;; would be nice to issue a full WARNING in the special case of
1115      ;; of type mismatches within a compilation unit (as in section
1116      ;; 3.2.2.3 of the spec) but at least as of sbcl-0.6.11, we don't
1117      ;; keep track of whether the mismatched data came from the same
1118      ;; compilation unit, so we can't do that. -- WHN 2001-02-11
1119      :lossage-fun #'compiler-style-warn
1120      :unwinnage-fun (cond (info #'compiler-style-warn)
1121                           (for-real #'compiler-notify)
1122                           (t nil))
1123      :really-assert
1124      (and for-real
1125           (not (and info
1126                     (ir1-attributep (fun-info-attributes info)
1127                                     explicit-check))))
1128      :where (if for-real
1129                 "previous declaration"
1130                 "previous definition"))))
1131
1132 ;;; Used for global inline expansion. Earlier something like this was
1133 ;;; used by %DEFUN too. FIXME: And now it's probably worth rethinking
1134 ;;; whether this function is a good idea at all.
1135 (defun ir1-convert-inline-expansion (name expansion var inlinep info)
1136   ;; Unless a :INLINE function, we temporarily clobber the inline
1137   ;; expansion. This prevents recursive inline expansion of
1138   ;; opportunistic pseudo-inlines.
1139   (unless (eq inlinep :inline)
1140     (setf (defined-fun-inline-expansion var) nil))
1141   (let ((fun (ir1-convert-inline-lambda expansion
1142                                         :source-name name
1143                                         ;; prevent instrumentation of
1144                                         ;; known function expansions
1145                                         :system-lambda (and info t))))
1146     (setf (functional-inlinep fun) inlinep)
1147     (assert-new-definition var fun)
1148     (setf (defined-fun-inline-expansion var) expansion)
1149     ;; substitute for any old references
1150     (unless (or (not *block-compile*)
1151                 (and info
1152                      (or (fun-info-transforms info)
1153                          (fun-info-templates info)
1154                          (fun-info-ir2-convert info))))
1155       (substitute-leaf fun var))
1156     fun))
1157
1158 ;;; the even-at-compile-time part of DEFUN
1159 ;;;
1160 ;;; The INLINE-EXPANSION is a LAMBDA-WITH-LEXENV, or NIL if there is
1161 ;;; no inline expansion.
1162 (defun %compiler-defun (name lambda-with-lexenv compile-toplevel)
1163   (let ((defined-fun nil)) ; will be set below if we're in the compiler
1164     (when compile-toplevel
1165       ;; better be in the compiler
1166       (aver (boundp '*lexenv*))
1167       (remhash name *free-funs*)
1168       (setf defined-fun (get-defined-fun name))
1169       (aver (fasl-output-p *compile-object*))
1170       (if (member name *fun-names-in-this-file* :test #'equal)
1171           (warn 'duplicate-definition :name name)
1172           (push name *fun-names-in-this-file*)))
1173
1174     (become-defined-fun-name name)
1175
1176     (cond (lambda-with-lexenv
1177            (setf (info :function :inline-expansion-designator name)
1178                  lambda-with-lexenv)
1179            (when defined-fun
1180              (setf (defined-fun-inline-expansion defined-fun)
1181                    lambda-with-lexenv)))
1182           (t
1183            (clear-info :function :inline-expansion-designator name)))
1184
1185     ;; old CMU CL comment:
1186     ;;   If there is a type from a previous definition, blast it,
1187     ;;   since it is obsolete.
1188     (when (and defined-fun
1189                (eq (leaf-where-from defined-fun) :defined))
1190       (setf (leaf-type defined-fun)
1191             ;; FIXME: If this is a block compilation thing, shouldn't
1192             ;; we be setting the type to the full derived type for the
1193             ;; definition, instead of this most general function type?
1194             (specifier-type 'function))))
1195
1196   (values))
1197
1198 \f
1199 ;;; Entry point utilities
1200
1201 ;;; Return a function for the Nth entry point.
1202 (defun optional-dispatch-entry-point-fun (dispatcher n)
1203   (declare (type optional-dispatch dispatcher)
1204            (type unsigned-byte n))
1205   (let* ((env (getf (optional-dispatch-plist dispatcher) :ir1-environment))
1206          (*lexenv* (first env))
1207          (*current-path* (second env)))
1208     (force (nth n (optional-dispatch-entry-points dispatcher)))))