1 ;;;; the top level interfaces to the compiler, plus some other
2 ;;;; compiler-related stuff (e.g. CL:CALL-ARGUMENTS-LIMIT) which
3 ;;;; doesn't obviously belong anywhere else
5 ;;;; This software is part of the SBCL system. See the README file for
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.
16 ;;; FIXME: Doesn't this belong somewhere else, like early-c.lisp?
17 (declaim (special *constants* *free-vars* *component-being-compiled*
18 *code-vector* *next-location* *result-fixups*
19 *free-funs* *source-paths*
20 *seen-blocks* *seen-funs* *list-conflicts-table*
21 *continuation-number* *continuation-numbers*
22 *number-continuations* *tn-id* *tn-ids* *id-tns*
23 *label-ids* *label-id* *id-labels*
24 *undefined-warnings* *compiler-error-count*
25 *compiler-warning-count* *compiler-style-warning-count*
27 *compiler-error-bailout*
28 #!+sb-show *compiler-trace-output*
29 *last-source-context* *last-original-source*
30 *last-source-form* *last-format-string* *last-format-args*
31 *last-message-count* *last-error-context*
32 *lexenv* *fun-names-in-this-file*
33 *allow-instrumenting*))
35 ;;; Whether reference to a thing which cannot be defined causes a full
37 (defvar *flame-on-necessarily-undefined-thing* nil)
39 (defvar *check-consistency* nil)
41 ;;; Set to NIL to disable loop analysis for register allocation.
42 (defvar *loop-analyze* t)
44 ;;; Bind this to a stream to capture various internal debugging output.
45 (defvar *compiler-trace-output* nil)
47 ;;; The current block compilation state. These are initialized to the
48 ;;; :BLOCK-COMPILE and :ENTRY-POINTS arguments that COMPILE-FILE was
51 ;;; *BLOCK-COMPILE-ARG* holds the original value of the :BLOCK-COMPILE
52 ;;; argument, which overrides any internal declarations.
53 (defvar *block-compile*)
54 (defvar *block-compile-arg*)
55 (declaim (type (member nil t :specified) *block-compile* *block-compile-arg*))
56 (defvar *entry-points*)
57 (declaim (list *entry-points*))
59 ;;; When block compiling, used by PROCESS-FORM to accumulate top level
60 ;;; lambdas resulting from compiling subforms. (In reverse order.)
61 (defvar *toplevel-lambdas*)
62 (declaim (list *toplevel-lambdas*))
64 ;;; The current non-macroexpanded toplevel form as printed when
65 ;;; *compile-print* is true.
66 (defvar *top-level-form-noted* nil)
68 (defvar sb!xc:*compile-verbose* t
70 "The default for the :VERBOSE argument to COMPILE-FILE.")
71 (defvar sb!xc:*compile-print* t
73 "The default for the :PRINT argument to COMPILE-FILE.")
74 (defvar *compile-progress* nil
76 "When this is true, the compiler prints to *STANDARD-OUTPUT* progress
77 information about the phases of compilation of each function. (This
78 is useful mainly in large block compilations.)")
80 (defvar sb!xc:*compile-file-pathname* nil
82 "The defaulted pathname of the file currently being compiled, or NIL if not
84 (defvar sb!xc:*compile-file-truename* nil
86 "The TRUENAME of the file currently being compiled, or NIL if not
89 (declaim (type (or pathname null)
90 sb!xc:*compile-file-pathname*
91 sb!xc:*compile-file-truename*))
93 ;;; the SOURCE-INFO structure for the current compilation. This is
94 ;;; null globally to indicate that we aren't currently in any
95 ;;; identifiable compilation.
96 (defvar *source-info* nil)
98 ;;; This is true if we are within a WITH-COMPILATION-UNIT form (which
99 ;;; normally causes nested uses to be no-ops).
100 (defvar *in-compilation-unit* nil)
102 ;;; Count of the number of compilation units dynamically enclosed by
103 ;;; the current active WITH-COMPILATION-UNIT that were unwound out of.
104 (defvar *aborted-compilation-unit-count*)
106 ;;; Mumble conditional on *COMPILE-PROGRESS*.
107 (defun maybe-mumble (&rest foo)
108 (when *compile-progress*
109 (compiler-mumble "~&")
110 (pprint-logical-block (*standard-output* nil :per-line-prefix "; ")
111 (apply #'compiler-mumble foo))))
113 (deftype object () '(or fasl-output core-object null))
115 (defvar *compile-object* nil)
116 (declaim (type object *compile-object*))
117 (defvar *compile-toplevel-object* nil)
119 (defvar *emit-cfasl* nil)
121 (defvar *fopcompile-label-counter*)
123 ;; Used during compilation to map code paths to the matching
124 ;; instrumentation conses.
125 (defvar *code-coverage-records* nil)
126 ;; Used during compilation to keep track of with source paths have been
127 ;; instrumented in which blocks.
128 (defvar *code-coverage-blocks* nil)
129 ;; Stores the code coverage instrumentation results. Keys are namestrings,
130 ;; the value is a list of (CONS PATH STATE), where STATE is NIL for
131 ;; a path that has not been visited, and T for one that has.
132 (defvar *code-coverage-info* (make-hash-table :test 'equal))
135 ;;;; WITH-COMPILATION-UNIT and WITH-COMPILATION-VALUES
137 (defmacro sb!xc:with-compilation-unit (options &body body)
139 "Affects compilations that take place within its dynamic extent. It is
140 intended to be eg. wrapped around the compilation of all files in the same system.
142 Following options are defined:
144 :OVERRIDE Boolean-Form
145 One of the effects of this form is to delay undefined warnings until the
146 end of the form, instead of giving them at the end of each compilation.
147 If OVERRIDE is NIL (the default), then the outermost
148 WITH-COMPILATION-UNIT form grabs the undefined warnings. Specifying
149 OVERRIDE true causes that form to grab any enclosed warnings, even if it
150 is enclosed by another WITH-COMPILATION-UNIT.
152 :POLICY Optimize-Declaration-Form
153 Provides dynamic scoping for global compiler optimization qualities and
154 restrictions, limiting effects of subsequent OPTIMIZE proclamations and
155 calls to SB-EXT:RESTRICT-COMPILER-POLICY to the dynamic scope of BODY.
157 If OVERRIDE is false, specified POLICY is merged with current global
158 policy. If OVERRIDE is true, current global policy, including any
159 restrictions, is discarded in favor of the specified POLICY.
161 Supplying POLICY NIL is equivalent to the option not being supplied at
162 all, ie. dynamic scoping of policy does not take place.
164 This option is an SBCL-specific experimental extension: Interface
167 :SOURCE-NAMESTRING Namestring-Form
168 Attaches the value returned by the Namestring-Form to the internal
169 debug-source information as the namestring of the source file. Normally
170 the namestring of the input-file for COMPILE-FILE is used: this option
171 can be used to provide source-file information for functions compiled
172 using COMPILE, or to override the input-file of COMPILE-FILE.
174 If both an outer and an inner WITH-COMPILATION-UNIT provide a
175 SOURCE-NAMESTRING, the inner one takes precedence. Unaffected
178 This is an SBCL-specific extension.
180 :SOURCE-PLIST Plist-Form
181 Attaches the value returned by the Plist-Form to internal debug-source
182 information of functions compiled in within the dynamic extent of BODY.
184 Primarily for use by development environments, in order to eg. associate
185 function definitions with editor-buffers. Can be accessed using
186 SB-INTROSPECT:DEFINITION-SOURCE-PLIST.
188 If an outer WITH-COMPILATION-UNIT form also provide a SOURCE-PLIST, it
189 is appended to the end of the provided SOURCE-PLIST. Unaffected
192 This is an SBCL-specific extension.
196 ;; Prevent proclamations from the file leaking, and restrict
197 ;; SAFETY to 3 -- otherwise uses the current global policy.
198 (with-compilation-unit (:policy '(optimize))
199 (restrict-compiler-policy 'safety 3)
202 ;; Using default policy instead of the current global one,
203 ;; except for DEBUG 3.
204 (with-compilation-unit (:policy '(optimize debug)
208 ;; Same as if :POLICY had not been specified at all: SAFETY 3
209 ;; proclamation leaks out from WITH-COMPILATION-UNIT.
210 (with-compilation-unit (:policy nil)
211 (declaim (optimize safety))
214 `(%with-compilation-unit (lambda () ,@body) ,@options))
216 (defvar *source-plist* nil)
217 (defvar *source-namestring* nil)
219 (defun %with-compilation-unit (fn &key override policy source-plist source-namestring)
220 (declare (type function fn))
222 (let ((succeeded-p nil)
223 (*source-plist* (append source-plist *source-plist*))
224 (*source-namestring* (or source-namestring *source-namestring*)))
225 (if (and *in-compilation-unit* (not override))
226 ;; Inside another WITH-COMPILATION-UNIT, a WITH-COMPILATION-UNIT is
227 ;; ordinarily (unless OVERRIDE) basically a no-op.
229 (multiple-value-prog1 (funcall fn) (setf succeeded-p t))
231 (incf *aborted-compilation-unit-count*)))
232 (let ((*aborted-compilation-unit-count* 0)
233 (*compiler-error-count* 0)
234 (*compiler-warning-count* 0)
235 (*compiler-style-warning-count* 0)
236 (*compiler-note-count* 0)
237 (*undefined-warnings* nil)
238 (*in-compilation-unit* t))
240 (handler-bind ((parse-unknown-type
242 (note-undefined-reference
243 (parse-unknown-type-specifier c)
246 (multiple-value-prog1 (funcall fn) (setf succeeded-p t))
248 (incf *aborted-compilation-unit-count*))
249 (summarize-compilation-unit (not succeeded-p))))))))))
251 (let ((*policy* (process-optimize-decl policy (unless override *policy*)))
252 (*policy-restrictions* (unless override *policy-restrictions*)))
256 ;;; Is NAME something that no conforming program can rely on
258 (defun name-reserved-by-ansi-p (name kind)
261 (eq (symbol-package (fun-name-block-name name))
264 (let ((symbol (typecase name
266 ((cons symbol) (car name))
267 (t (return-from name-reserved-by-ansi-p nil)))))
268 (eq (symbol-package symbol) *cl-package*)))))
270 ;;; This is to be called at the end of a compilation unit. It signals
271 ;;; any residual warnings about unknown stuff, then prints the total
272 ;;; error counts. ABORT-P should be true when the compilation unit was
273 ;;; aborted by throwing out. ABORT-COUNT is the number of dynamically
274 ;;; enclosed nested compilation units that were aborted.
275 (defun summarize-compilation-unit (abort-p)
278 (handler-bind ((style-warning #'compiler-style-warning-handler)
279 (warning #'compiler-warning-handler))
281 (let ((undefs (sort *undefined-warnings* #'string<
283 (let ((x (undefined-warning-name x)))
286 (prin1-to-string x)))))))
287 (dolist (kind '(:variable :function :type))
288 (let ((names (mapcar #'undefined-warning-name
289 (remove kind undefs :test #'neq
290 :key #'undefined-warning-kind))))
291 (when names (push (cons kind names) summary))))
292 (dolist (undef undefs)
293 (let ((name (undefined-warning-name undef))
294 (kind (undefined-warning-kind undef))
295 (warnings (undefined-warning-warnings undef))
296 (undefined-warning-count (undefined-warning-count undef)))
297 (dolist (*compiler-error-context* warnings)
298 (if #-sb-xc-host (and (member kind '(:function :type))
299 (name-reserved-by-ansi-p name kind)
300 *flame-on-necessarily-undefined-thing*)
307 "~@<There is no function named ~S. References to ~S ~
308 in some contexts (like starts of blocks) have ~
309 special meaning, but here it would have to be a ~
310 function, and that shouldn't be right.~:@>" name
314 "~@<The function ~S is undefined, and its name is ~
315 reserved by ANSI CL so that even if it were ~
316 defined later, the code doing so would not be ~
317 portable.~:@>" name))))
319 (if (and (consp name) (eq 'quote (car name)))
321 "~@<Undefined type ~S. The name starts with ~S: ~
322 probably use of a quoted type name in a context ~
323 where the name is not evaluated.~:@>"
326 "~@<Undefined type ~S. Note that name ~S is ~
327 reserved by ANSI CL, so code defining a type with ~
328 that name would not be portable.~:@>" name
330 (if (eq kind :variable)
331 (compiler-warn "undefined ~(~A~): ~S" kind name)
332 (compiler-style-warn "undefined ~(~A~): ~S" kind name))))
333 (let ((warn-count (length warnings)))
334 (when (and warnings (> undefined-warning-count warn-count))
335 (let ((more (- undefined-warning-count warn-count)))
336 (if (eq kind :variable)
338 "~W more use~:P of undefined ~(~A~) ~S"
341 "~W more use~:P of undefined ~(~A~) ~S"
342 more kind name))))))))))
344 (unless (and (not abort-p)
345 (zerop *aborted-compilation-unit-count*)
346 (zerop *compiler-error-count*)
347 (zerop *compiler-warning-count*)
348 (zerop *compiler-style-warning-count*)
349 (zerop *compiler-note-count*))
350 (pprint-logical-block (*error-output* nil :per-line-prefix "; ")
351 (format *error-output* "~&compilation unit ~:[finished~;aborted~]"
353 (dolist (cell summary)
354 (destructuring-bind (kind &rest names) cell
355 (format *error-output*
356 "~& Undefined ~(~A~)~p:~
357 ~% ~{~<~% ~1:;~S~>~^ ~}"
358 kind (length names) names)))
359 (format *error-output* "~[~:;~:*~& caught ~W fatal ERROR condition~:P~]~
360 ~[~:;~:*~& caught ~W ERROR condition~:P~]~
361 ~[~:;~:*~& caught ~W WARNING condition~:P~]~
362 ~[~:;~:*~& caught ~W STYLE-WARNING condition~:P~]~
363 ~[~:;~:*~& printed ~W note~:P~]"
364 *aborted-compilation-unit-count*
365 *compiler-error-count*
366 *compiler-warning-count*
367 *compiler-style-warning-count*
368 *compiler-note-count*))
369 (terpri *error-output*)
370 (force-output *error-output*))))
372 ;;; Evaluate BODY, then return (VALUES BODY-VALUE WARNINGS-P
373 ;;; FAILURE-P), where BODY-VALUE is the first value of the body, and
374 ;;; WARNINGS-P and FAILURE-P are as in CL:COMPILE or CL:COMPILE-FILE.
375 ;;; This also wraps up WITH-IR1-NAMESPACE functionality.
376 (defmacro with-compilation-values (&body body)
378 (let ((*warnings-p* nil)
380 (values (progn ,@body)
384 ;;;; component compilation
386 (defparameter *max-optimize-iterations* 3 ; ARB
388 "The upper limit on the number of times that we will consecutively do IR1
389 optimization that doesn't introduce any new code. A finite limit is
390 necessary, since type inference may take arbitrarily long to converge.")
392 (defevent ir1-optimize-until-done "IR1-OPTIMIZE-UNTIL-DONE called")
393 (defevent ir1-optimize-maxed-out "hit *MAX-OPTIMIZE-ITERATIONS* limit")
395 ;;; Repeatedly optimize COMPONENT until no further optimizations can
396 ;;; be found or we hit our iteration limit. When we hit the limit, we
397 ;;; clear the component and block REOPTIMIZE flags to discourage the
398 ;;; next optimization attempt from pounding on the same code.
399 (defun ir1-optimize-until-done (component)
400 (declare (type component component))
402 (event ir1-optimize-until-done)
404 (cleared-reanalyze nil)
407 (when (component-reanalyze component)
409 (setq cleared-reanalyze t)
410 (setf (component-reanalyze component) nil))
411 (setf (component-reoptimize component) nil)
412 (ir1-optimize component fastp)
413 (cond ((component-reoptimize component)
415 (when (and (>= count *max-optimize-iterations*)
416 (not (component-reanalyze component))
417 (eq (component-reoptimize component) :maybe))
419 (cond ((retry-delayed-ir1-transforms :optimize)
423 (event ir1-optimize-maxed-out)
424 (setf (component-reoptimize component) nil)
425 (do-blocks (block component)
426 (setf (block-reoptimize block) nil))
428 ((retry-delayed-ir1-transforms :optimize)
434 (setq fastp (>= count *max-optimize-iterations*))
435 (maybe-mumble (if fastp "-" ".")))
436 (when cleared-reanalyze
437 (setf (component-reanalyze component) t)))
440 (defparameter *constraint-propagate* t)
442 ;;; KLUDGE: This was bumped from 5 to 10 in a DTC patch ported by MNA
443 ;;; from CMU CL into sbcl-0.6.11.44, the same one which allowed IR1
444 ;;; transforms to be delayed. Either DTC or MNA or both didn't explain
445 ;;; why, and I don't know what the rationale was. -- WHN 2001-04-28
447 ;;; FIXME: It would be good to document why it's important to have a
448 ;;; large value here, and what the drawbacks of an excessively large
449 ;;; value are; and it might also be good to make it depend on
450 ;;; optimization policy.
451 (defparameter *reoptimize-after-type-check-max* 10)
453 (defevent reoptimize-maxed-out
454 "*REOPTIMIZE-AFTER-TYPE-CHECK-MAX* exceeded.")
456 ;;; Iterate doing FIND-DFO until no new dead code is discovered.
457 (defun dfo-as-needed (component)
458 (declare (type component component))
459 (when (component-reanalyze component)
463 (unless (component-reanalyze component)
469 ;;; Do all the IR1 phases for a non-top-level component.
470 (defun ir1-phases (component)
471 (declare (type component component))
472 (aver-live-component component)
473 (let ((*constraint-universe* (make-array 64 ; arbitrary, but don't
475 :fill-pointer 0 :adjustable t))
477 (*delayed-ir1-transforms* nil))
478 (declare (special *constraint-universe* *delayed-ir1-transforms*))
480 (ir1-optimize-until-done component)
481 (when (or (component-new-functionals component)
482 (component-reanalyze-functionals component))
483 (maybe-mumble "locall ")
484 (locall-analyze-component component))
485 (dfo-as-needed component)
486 (when *constraint-propagate*
487 (maybe-mumble "constraint ")
488 (constraint-propagate component))
489 (when (retry-delayed-ir1-transforms :constraint)
490 (maybe-mumble "Rtran "))
491 (flet ((want-reoptimization-p ()
492 (or (component-reoptimize component)
493 (component-reanalyze component)
494 (component-new-functionals component)
495 (component-reanalyze-functionals component))))
496 (unless (and (want-reoptimization-p)
497 ;; We delay the generation of type checks until
498 ;; the type constraints have had time to
499 ;; propagate, else the compiler can confuse itself.
500 (< loop-count (- *reoptimize-after-type-check-max* 4)))
501 (maybe-mumble "type ")
502 (generate-type-checks component)
503 (unless (want-reoptimization-p)
505 (when (>= loop-count *reoptimize-after-type-check-max*)
506 (maybe-mumble "[reoptimize limit]")
507 (event reoptimize-maxed-out)
511 (ir1-finalize component)
514 (defun %compile-component (component)
515 (let ((*code-segment* nil)
518 (*constant-segment* nil)
520 (*constant-table* nil)
522 (*constant-vector* nil))
523 (maybe-mumble "GTN ")
524 (gtn-analyze component)
525 (maybe-mumble "LTN ")
526 (ltn-analyze component)
527 (dfo-as-needed component)
528 (maybe-mumble "control ")
529 (control-analyze component #'make-ir2-block)
531 (when (or (ir2-component-values-receivers (component-info component))
532 (component-dx-lvars component))
533 (maybe-mumble "stack ")
534 (stack-analyze component)
535 ;; Assign BLOCK-NUMBER for any cleanup blocks introduced by
536 ;; stack analysis. There shouldn't be any unreachable code after
537 ;; control, so this won't delete anything.
538 (dfo-as-needed component))
542 (maybe-mumble "IR2tran ")
544 (entry-analyze component)
545 (ir2-convert component)
547 (when (policy *lexenv* (>= speed compilation-speed))
548 (maybe-mumble "copy ")
549 (copy-propagate component))
551 (ir2-optimize component)
553 (select-representations component)
555 (when *check-consistency*
556 (maybe-mumble "check2 ")
557 (check-ir2-consistency component))
559 (delete-unreferenced-tns component)
561 (maybe-mumble "life ")
562 (lifetime-analyze component)
564 (when *compile-progress*
565 (compiler-mumble "") ; Sync before doing more output.
566 (pre-pack-tn-stats component *standard-output*))
568 (when *check-consistency*
569 (maybe-mumble "check-life ")
570 (check-life-consistency component))
572 (maybe-mumble "pack ")
575 (when *check-consistency*
576 (maybe-mumble "check-pack ")
577 (check-pack-consistency component))
579 (when *compiler-trace-output*
580 (describe-component component *compiler-trace-output*)
581 (describe-ir2-component component *compiler-trace-output*))
583 (maybe-mumble "code ")
584 (multiple-value-bind (code-length trace-table fixup-notes)
585 (generate-code component)
588 (when *compiler-trace-output*
589 (format *compiler-trace-output*
590 "~|~%disassembly of code for ~S~2%" component)
591 (sb!disassem:disassemble-assem-segment *code-segment*
592 *compiler-trace-output*))
594 (etypecase *compile-object*
596 (maybe-mumble "fasl")
597 (fasl-dump-component component
604 (maybe-mumble "core")
605 (make-core-component component
613 ;; We're done, so don't bother keeping anything around.
614 (setf (component-info component) :dead)
618 ;;; Delete components with no external entry points before we try to
619 ;;; generate code. Unreachable closures can cause IR2 conversion to
620 ;;; puke on itself, since it is the reference to the closure which
621 ;;; normally causes the components to be combined.
622 (defun delete-if-no-entries (component)
623 (dolist (fun (component-lambdas component) (delete-component component))
624 (when (functional-has-external-references-p fun)
626 (case (functional-kind fun)
629 (unless (every (lambda (ref)
630 (eq (node-component ref) component))
634 (defun compile-component (component)
636 ;; miscellaneous sanity checks
638 ;; FIXME: These are basically pretty wimpy compared to the checks done
639 ;; by the old CHECK-IR1-CONSISTENCY code. It would be really nice to
640 ;; make those internal consistency checks work again and use them.
641 (aver-live-component component)
642 (do-blocks (block component)
643 (aver (eql (block-component block) component)))
644 (dolist (lambda (component-lambdas component))
645 ;; sanity check to prevent weirdness from propagating insidiously as
646 ;; far from its root cause as it did in bug 138: Make sure that
647 ;; thing-to-COMPONENT links are consistent.
648 (aver (eql (lambda-component lambda) component))
649 (aver (eql (node-component (lambda-bind lambda)) component)))
651 (let* ((*component-being-compiled* component))
653 ;; Record xref information before optimization. This way the
654 ;; stored xref data reflects the real source as closely as
656 (record-component-xrefs component)
658 (ir1-phases component)
661 (dfo-as-needed component)
662 (find-dominators component)
663 (loop-analyze component))
666 (when (and *loop-analyze* *compiler-trace-output*)
667 (labels ((print-blocks (block)
668 (format *compiler-trace-output* " ~A~%" block)
669 (when (block-loop-next block)
670 (print-blocks (block-loop-next block))))
672 (format *compiler-trace-output* "loop=~A~%" loop)
673 (print-blocks (loop-blocks loop))
674 (dolist (l (loop-inferiors loop))
676 (print-loop (component-outer-loop component))))
679 ;; FIXME: What is MAYBE-MUMBLE for? Do we need it any more?
680 (maybe-mumble "env ")
681 (physenv-analyze component)
682 (dfo-as-needed component)
684 (delete-if-no-entries component)
686 (unless (eq (block-next (component-head component))
687 (component-tail component))
688 (%compile-component component)))
690 (clear-constant-info)
694 ;;;; clearing global data structures
696 ;;;; FIXME: Is it possible to get rid of this stuff, getting rid of
697 ;;;; global data structures entirely when possible and consing up the
698 ;;;; others from scratch instead of clearing and reusing them?
700 ;;; Clear the INFO in constants in the *FREE-VARS*, etc. In
701 ;;; addition to allowing stuff to be reclaimed, this is required for
702 ;;; correct assignment of constant offsets, since we need to assign a
703 ;;; new offset for each component. We don't clear the FUNCTIONAL-INFO
704 ;;; slots, since they are used to keep track of functions across
705 ;;; component boundaries.
706 (defun clear-constant-info ()
707 (maphash (lambda (k v)
709 (setf (leaf-info v) nil)
710 (setf (constant-boxed-tn v) nil))
712 (maphash (lambda (k v)
715 (setf (leaf-info v) nil)
716 (setf (constant-boxed-tn v) nil)))
720 ;;; Blow away the REFS for all global variables, and let COMPONENT
722 (defun clear-ir1-info (component)
723 (declare (type component component))
725 (maphash (lambda (k v)
729 (delete-if #'here-p (leaf-refs v)))
730 (when (basic-var-p v)
731 (setf (basic-var-sets v)
732 (delete-if #'here-p (basic-var-sets v))))))
735 (eq (node-component x) component)))
741 ;;; Clear global variables used by the compiler.
743 ;;; FIXME: It seems kinda nasty and unmaintainable to have to do this,
744 ;;; and it adds overhead even when people aren't using the compiler.
745 ;;; Perhaps we could make these global vars unbound except when
746 ;;; actually in use, so that this function could go away.
747 (defun clear-stuff (&optional (debug-too t))
749 ;; Clear global tables.
750 (when (boundp '*free-funs*)
751 (clrhash *free-funs*)
752 (clrhash *free-vars*)
753 (clrhash *constants*))
755 ;; Clear debug counters and tables.
756 (clrhash *seen-blocks*)
757 (clrhash *seen-funs*)
758 (clrhash *list-conflicts-table*)
761 (clrhash *continuation-numbers*)
762 (clrhash *number-continuations*)
763 (setq *continuation-number* 0)
767 (clrhash *label-ids*)
768 (clrhash *id-labels*)
771 ;; (Note: The CMU CL code used to set CL::*GENSYM-COUNTER* to zero here.
772 ;; Superficially, this seemed harmful -- the user could reasonably be
773 ;; surprised if *GENSYM-COUNTER* turned back to zero when something was
774 ;; compiled. A closer inspection showed that this actually turned out to be
775 ;; harmless in practice, because CLEAR-STUFF was only called from within
776 ;; forms which bound CL::*GENSYM-COUNTER* to zero. However, this means that
777 ;; even though zeroing CL::*GENSYM-COUNTER* here turned out to be harmless in
778 ;; practice, it was also useless in practice. So we don't do it any more.)
784 ;;; Print out some useful info about COMPONENT to STREAM.
785 (defun describe-component (component *standard-output*)
786 (declare (type component component))
787 (format t "~|~%;;;; component: ~S~2%" (component-name component))
788 (print-all-blocks component)
791 (defun describe-ir2-component (component *standard-output*)
792 (format t "~%~|~%;;;; IR2 component: ~S~2%" (component-name component))
793 (format t "entries:~%")
794 (dolist (entry (ir2-component-entries (component-info component)))
795 (format t "~4TL~D: ~S~:[~; [closure]~]~%"
796 (label-id (entry-info-offset entry))
797 (entry-info-name entry)
798 (entry-info-closure-tn entry)))
800 (pre-pack-tn-stats component *standard-output*)
802 (print-ir2-blocks component)
808 ;;;; When reading from a file, we have to keep track of some source
809 ;;;; information. We also exploit our ability to back up for printing
810 ;;;; the error context and for recovering from errors.
812 ;;;; The interface we provide to this stuff is the stream-oid
813 ;;;; SOURCE-INFO structure. The bookkeeping is done as a side effect
814 ;;;; of getting the next source form.
816 ;;; A FILE-INFO structure holds all the source information for a
818 (def!struct (file-info
820 #-no-ansi-print-object
821 (:print-object (lambda (s stream)
822 (print-unreadable-object (s stream :type t)
823 (princ (file-info-name s) stream)))))
824 ;; If a file, the truename of the corresponding source file. If from
825 ;; a Lisp form, :LISP. If from a stream, :STREAM.
826 (name (missing-arg) :type (or pathname (eql :lisp)))
827 ;; the external format that we'll call OPEN with, if NAME is a file.
828 (external-format nil)
829 ;; the defaulted, but not necessarily absolute file name (i.e. prior
830 ;; to TRUENAME call.) Null if not a file. This is used to set
831 ;; *COMPILE-FILE-PATHNAME*, and if absolute, is dumped in the
833 (untruename nil :type (or pathname null))
834 ;; the file's write date (if relevant)
835 (write-date nil :type (or unsigned-byte null))
836 ;; the source path root number of the first form in this file (i.e.
837 ;; the total number of forms converted previously in this
839 (source-root 0 :type unsigned-byte)
840 ;; parallel vectors containing the forms read out of the file and
841 ;; the file positions that reading of each form started at (i.e. the
842 ;; end of the previous form)
843 (forms (make-array 10 :fill-pointer 0 :adjustable t) :type (vector t))
844 (positions (make-array 10 :fill-pointer 0 :adjustable t) :type (vector t)))
846 ;;; The SOURCE-INFO structure provides a handle on all the source
847 ;;; information for an entire compilation.
848 (def!struct (source-info
849 #-no-ansi-print-object
850 (:print-object (lambda (s stream)
851 (print-unreadable-object (s stream :type t))))
853 ;; the UT that compilation started at
854 (start-time (get-universal-time) :type unsigned-byte)
855 ;; the IRT that compilation started at
856 (start-real-time (get-internal-real-time) :type unsigned-byte)
857 ;; the FILE-INFO structure for this compilation
858 (file-info nil :type (or file-info null))
859 ;; the stream that we are using to read the FILE-INFO, or NIL if
860 ;; no stream has been opened yet
861 (stream nil :type (or stream null))
862 ;; if the current compilation is recursive (e.g., due to EVAL-WHEN
863 ;; processing at compile-time), the invoking compilation's
865 (parent nil :type (or source-info null)))
867 ;;; Given a pathname, return a SOURCE-INFO structure.
868 (defun make-file-source-info (file external-format)
870 :file-info (make-file-info :name (truename file)
871 :untruename (merge-pathnames file)
872 :external-format external-format
873 :write-date (file-write-date file))))
875 ;;; Return a SOURCE-INFO to describe the incremental compilation of FORM.
876 (defun make-lisp-source-info (form &key parent)
878 :file-info (make-file-info :name :lisp
883 ;;; Walk up the SOURCE-INFO list until we either reach a SOURCE-INFO
884 ;;; with no parent (e.g., from a REPL evaluation) or until we reach a
885 ;;; SOURCE-INFO whose FILE-INFO denotes a file.
886 (defun get-toplevelish-file-info (&optional (source-info *source-info*))
888 (do* ((sinfo source-info (source-info-parent sinfo))
889 (finfo (source-info-file-info sinfo)
890 (source-info-file-info sinfo)))
891 ((or (not (source-info-p (source-info-parent sinfo)))
892 (pathnamep (file-info-name finfo)))
895 ;;; Return a form read from STREAM; or for EOF use the trick,
896 ;;; popularized by Kent Pitman, of returning STREAM itself. If an
897 ;;; error happens, then convert it to standard abort-the-compilation
898 ;;; error condition (possibly recording some extra location
900 (defun read-for-compile-file (stream position)
902 (read-preserving-whitespace stream nil stream)
903 (reader-error (condition)
904 (error 'input-error-in-compile-file
906 ;; We don't need to supply :POSITION here because
907 ;; READER-ERRORs already know their position in the file.
909 ;; ANSI, in its wisdom, says that READ should return END-OF-FILE
910 ;; (and that this is not a READER-ERROR) when it encounters end of
911 ;; file in the middle of something it's trying to read.
912 (end-of-file (condition)
913 (error 'input-error-in-compile-file
915 ;; We need to supply :POSITION here because the END-OF-FILE
916 ;; condition doesn't carry the position that the user
917 ;; probably cares about, where the failed READ began.
918 :position position))))
920 ;;; If STREAM is present, return it, otherwise open a stream to the
921 ;;; current file. There must be a current file.
923 ;;; FIXME: This is probably an unnecessarily roundabout way to do
924 ;;; things now that we process a single file in COMPILE-FILE (unlike
925 ;;; the old CMU CL code, which accepted multiple files). Also, the old
927 ;;; When we open a new file, we also reset *PACKAGE* and policy.
928 ;;; This gives the effect of rebinding around each file.
929 ;;; which doesn't seem to be true now. Check to make sure that if
930 ;;; such rebinding is necessary, it's still done somewhere.
931 (defun get-source-stream (info)
932 (declare (type source-info info))
933 (or (source-info-stream info)
934 (let* ((file-info (source-info-file-info info))
935 (name (file-info-name file-info))
936 (external-format (file-info-external-format file-info)))
937 (setf sb!xc:*compile-file-truename* name
938 sb!xc:*compile-file-pathname* (file-info-untruename file-info)
939 (source-info-stream info)
940 (open name :direction :input
941 :external-format external-format)))))
943 ;;; Close the stream in INFO if it is open.
944 (defun close-source-info (info)
945 (declare (type source-info info))
946 (let ((stream (source-info-stream info)))
947 (when stream (close stream)))
948 (setf (source-info-stream info) nil)
951 ;;; Loop over FORMS retrieved from INFO. Used by COMPILE-FILE and
952 ;;; LOAD when loading from a FILE-STREAM associated with a source
954 (defmacro do-forms-from-info (((form &rest keys) info)
956 (aver (symbolp form))
957 (once-only ((info info))
958 `(let ((*source-info* ,info))
959 (loop (destructuring-bind (,form &key ,@keys &allow-other-keys)
960 (let* ((file-info (source-info-file-info ,info))
961 (stream (get-source-stream ,info))
962 (pos (file-position stream))
963 (form (read-for-compile-file stream pos)))
964 (if (eq form stream) ; i.e., if EOF
966 (let* ((forms (file-info-forms file-info))
967 (current-idx (+ (fill-pointer forms)
968 (file-info-source-root
970 (vector-push-extend form forms)
971 (vector-push-extend pos (file-info-positions
973 (list form :current-index current-idx))))
976 ;;; Read and compile the source file.
977 (defun sub-sub-compile-file (info)
978 (do-forms-from-info ((form current-index) info)
979 (find-source-paths form current-index)
980 (process-toplevel-form
981 form `(original-source-start 0 ,current-index) nil)))
983 ;;; Return the INDEX'th source form read from INFO and the position
984 ;;; where it was read.
985 (defun find-source-root (index info)
986 (declare (type index index) (type source-info info))
987 (let ((file-info (source-info-file-info info)))
988 (values (aref (file-info-forms file-info) index)
989 (aref (file-info-positions file-info) index))))
991 ;;;; processing of top level forms
993 ;;; This is called by top level form processing when we are ready to
994 ;;; actually compile something. If *BLOCK-COMPILE* is T, then we still
995 ;;; convert the form, but delay compilation, pushing the result on
996 ;;; *TOPLEVEL-LAMBDAS* instead.
997 (defun convert-and-maybe-compile (form path)
998 (declare (list path))
999 (let ((*top-level-form-noted* (note-top-level-form form t)))
1000 ;; Don't bother to compile simple objects that just sit there.
1001 (when (and form (or (symbolp form) (consp form)))
1002 (if (fopcompilable-p form)
1003 (let ((*fopcompile-label-counter* 0))
1004 (fopcompile form path nil))
1005 (let ((*lexenv* (make-lexenv
1007 :handled-conditions *handled-conditions*
1008 :disabled-package-locks *disabled-package-locks*))
1009 (tll (ir1-toplevel form path nil)))
1010 (if (eq *block-compile* t)
1011 (push tll *toplevel-lambdas*)
1012 (compile-toplevel (list tll) nil))
1015 ;;; Macroexpand FORM in the current environment with an error handler.
1016 ;;; We only expand one level, so that we retain all the intervening
1017 ;;; forms in the source path.
1018 (defun preprocessor-macroexpand-1 (form)
1019 (handler-case (%macroexpand-1 form *lexenv*)
1021 (compiler-error "(during macroexpansion of ~A)~%~A"
1022 (let ((*print-level* 2)
1024 (format nil "~S" form))
1027 ;;; Process a PROGN-like portion of a top level form. FORMS is a list of
1028 ;;; the forms, and PATH is the source path of the FORM they came out of.
1029 ;;; COMPILE-TIME-TOO is as in ANSI "3.2.3.1 Processing of Top Level Forms".
1030 (defun process-toplevel-progn (forms path compile-time-too)
1031 (declare (list forms) (list path))
1032 (dolist (form forms)
1033 (process-toplevel-form form path compile-time-too)))
1035 ;;; Process a top level use of LOCALLY, or anything else (e.g.
1036 ;;; MACROLET) at top level which has declarations and ordinary forms.
1037 ;;; We parse declarations and then recursively process the body.
1038 (defun process-toplevel-locally (body path compile-time-too &key vars funs)
1039 (declare (list path))
1040 (multiple-value-bind (forms decls)
1041 (parse-body body :doc-string-allowed nil :toplevel t)
1042 (let* ((*lexenv* (process-decls decls vars funs))
1043 ;; FIXME: VALUES declaration
1045 ;; Binding *POLICY* is pretty much of a hack, since it
1046 ;; causes LOCALLY to "capture" enclosed proclamations. It
1047 ;; is necessary because CONVERT-AND-MAYBE-COMPILE uses the
1048 ;; value of *POLICY* as the policy. The need for this hack
1049 ;; is due to the quirk that there is no way to represent in
1050 ;; a POLICY that an optimize quality came from the default.
1052 ;; FIXME: Ideally, something should be done so that DECLAIM
1053 ;; inside LOCALLY works OK. Failing that, at least we could
1054 ;; issue a warning instead of silently screwing up.
1055 (*policy* (lexenv-policy *lexenv*))
1056 ;; This is probably also a hack
1057 (*handled-conditions* (lexenv-handled-conditions *lexenv*))
1059 (*disabled-package-locks* (lexenv-disabled-package-locks *lexenv*)))
1060 (process-toplevel-progn forms path compile-time-too))))
1062 ;;; Parse an EVAL-WHEN situations list, returning three flags,
1063 ;;; (VALUES COMPILE-TOPLEVEL LOAD-TOPLEVEL EXECUTE), indicating
1064 ;;; the types of situations present in the list.
1065 (defun parse-eval-when-situations (situations)
1066 (when (or (not (listp situations))
1067 (set-difference situations
1074 (compiler-error "bad EVAL-WHEN situation list: ~S" situations))
1075 (let ((deprecated-names (intersection situations '(compile load eval))))
1076 (when deprecated-names
1077 (style-warn "using deprecated EVAL-WHEN situation names~{ ~S~}"
1079 (values (intersection '(:compile-toplevel compile)
1081 (intersection '(:load-toplevel load) situations)
1082 (intersection '(:execute eval) situations)))
1085 ;;; utilities for extracting COMPONENTs of FUNCTIONALs
1086 (defun functional-components (f)
1087 (declare (type functional f))
1089 (clambda (list (lambda-component f)))
1090 (optional-dispatch (let ((result nil))
1091 (flet ((maybe-frob (maybe-clambda)
1092 (when (and maybe-clambda
1093 (promise-ready-p maybe-clambda))
1094 (pushnew (lambda-component
1095 (force maybe-clambda))
1097 (map nil #'maybe-frob (optional-dispatch-entry-points f))
1098 (maybe-frob (optional-dispatch-more-entry f))
1099 (maybe-frob (optional-dispatch-main-entry f)))
1102 (defun make-functional-from-toplevel-lambda (lambda-expression
1106 ;; I'd thought NIL should
1107 ;; work, but it doesn't.
1108 ;; -- WHN 2001-09-20
1110 (let* ((*current-path* path)
1111 (component (make-empty-component))
1112 (*current-component* component)
1113 (debug-name-tail (or name (name-lambdalike lambda-expression)))
1114 (source-name (or name '.anonymous.)))
1115 (setf (component-name component) (debug-name 'initial-component debug-name-tail)
1116 (component-kind component) :initial)
1117 (let* ((fun (let ((*allow-instrumenting* t))
1118 (funcall #'ir1-convert-lambdalike
1120 :source-name source-name)))
1121 ;; Convert the XEP using the policy of the real function. Otherwise
1122 ;; the wrong policy will be used for deciding whether to type-check
1123 ;; the parameters of the real function (via CONVERT-CALL /
1124 ;; PROPAGATE-TO-ARGS). -- JES, 2007-02-27
1125 (*lexenv* (make-lexenv :policy (lexenv-policy (functional-lexenv fun))))
1126 (xep (ir1-convert-lambda (make-xep-lambda-expression fun)
1127 :source-name source-name
1128 :debug-name (debug-name 'tl-xep debug-name-tail)
1131 (assert-global-function-definition-type name fun))
1132 (setf (functional-kind xep) :external
1133 (functional-entry-fun xep) fun
1134 (functional-entry-fun fun) xep
1135 (component-reanalyze component) t
1136 (functional-has-external-references-p xep) t)
1137 (reoptimize-component component :maybe)
1138 (locall-analyze-xep-entry-point fun)
1139 ;; Any leftover REFs to FUN outside local calls get replaced with the
1141 (substitute-leaf-if (lambda (ref)
1142 (let* ((lvar (ref-lvar ref))
1143 (dest (when lvar (lvar-dest lvar)))
1144 (kind (when (basic-combination-p dest)
1145 (basic-combination-kind dest))))
1151 ;;; Compile LAMBDA-EXPRESSION into *COMPILE-OBJECT*, returning a
1152 ;;; description of the result.
1153 ;;; * If *COMPILE-OBJECT* is a CORE-OBJECT, then write the function
1154 ;;; into core and return the compiled FUNCTION value.
1155 ;;; * If *COMPILE-OBJECT* is a fasl file, then write the function
1156 ;;; into the fasl file and return a dump handle.
1158 ;;; If NAME is provided, then we try to use it as the name of the
1159 ;;; function for debugging/diagnostic information.
1160 (defun %compile (lambda-expression
1165 ;; This magical idiom seems to be the appropriate
1166 ;; path for compiling standalone LAMBDAs, judging
1167 ;; from the CMU CL code and experiment, so it's a
1168 ;; nice default for things where we don't have a
1169 ;; real source path (as in e.g. inside CL:COMPILE).
1170 '(original-source-start 0 0)))
1172 (legal-fun-name-or-type-error name))
1173 (let* ((*lexenv* (make-lexenv
1175 :handled-conditions *handled-conditions*
1176 :disabled-package-locks *disabled-package-locks*))
1177 (*compiler-sset-counter* 0)
1178 (fun (make-functional-from-toplevel-lambda lambda-expression
1182 ;; FIXME: The compile-it code from here on is sort of a
1183 ;; twisted version of the code in COMPILE-TOPLEVEL. It'd be
1184 ;; better to find a way to share the code there; or
1185 ;; alternatively, to use this code to replace the code there.
1186 ;; (The second alternative might be pretty easy if we used
1187 ;; the :LOCALL-ONLY option to IR1-FOR-LAMBDA. Then maybe the
1188 ;; whole FUNCTIONAL-KIND=:TOPLEVEL case could go away..)
1190 (locall-analyze-clambdas-until-done (list fun))
1192 (let ((components-from-dfo (find-initial-dfo (list fun))))
1193 (dolist (component-from-dfo components-from-dfo)
1194 (compile-component component-from-dfo)
1195 (replace-toplevel-xeps component-from-dfo))
1197 (let ((entry-table (etypecase *compile-object*
1198 (fasl-output (fasl-output-entry-table
1200 (core-object (core-object-entry-table
1201 *compile-object*)))))
1202 (multiple-value-bind (result found-p)
1203 (gethash (leaf-info fun) entry-table)
1207 ;; KLUDGE: This code duplicates some other code in this
1208 ;; file. In the great reorganzation, the flow of program
1209 ;; logic changed from the original CMUCL model, and that
1210 ;; path (as of sbcl-0.7.5 in SUB-COMPILE-FILE) was no
1211 ;; longer followed for CORE-OBJECTS, leading to BUG
1212 ;; 156. This place is transparently not the right one for
1213 ;; this code, but I don't have a clear enough overview of
1214 ;; the compiler to know how to rearrange it all so that
1215 ;; this operation fits in nicely, and it was blocking
1216 ;; reimplementation of (DECLAIM (INLINE FOO)) (MACROLET
1217 ;; ((..)) (DEFUN FOO ...))
1219 ;; FIXME: This KLUDGE doesn't solve all the problem in an
1220 ;; ideal way, as (1) definitions typed in at the REPL
1221 ;; without an INLINE declaration will give a NULL
1222 ;; FUNCTION-LAMBDA-EXPRESSION (allowable, but not ideal)
1223 ;; and (2) INLINE declarations will yield a
1224 ;; FUNCTION-LAMBDA-EXPRESSION headed by
1225 ;; SB-C:LAMBDA-WITH-LEXENV, even for null LEXENV. -- CSR,
1228 ;; (2) is probably fairly easy to fix -- it is, after all,
1229 ;; a matter of list manipulation (or possibly of teaching
1230 ;; CL:FUNCTION about SB-C:LAMBDA-WITH-LEXENV). (1) is
1231 ;; significantly harder, as the association between
1232 ;; function object and source is a tricky one.
1234 ;; FUNCTION-LAMBDA-EXPRESSION "works" (i.e. returns a
1235 ;; non-NULL list) when the function in question has been
1236 ;; compiled by (COMPILE <x> '(LAMBDA ...)); it does not
1237 ;; work when it has been compiled as part of the top-level
1238 ;; EVAL strategy of compiling everything inside (LAMBDA ()
1239 ;; ...). -- CSR, 2002-11-02
1240 (when (core-object-p *compile-object*)
1241 (fix-core-source-info *source-info* *compile-object* result))
1243 (mapc #'clear-ir1-info components-from-dfo)
1246 (defun process-toplevel-cold-fset (name lambda-expression path)
1247 (unless (producing-fasl-file)
1248 (error "can't COLD-FSET except in a fasl file"))
1249 (legal-fun-name-or-type-error name)
1250 (fasl-dump-cold-fset name
1251 (%compile lambda-expression
1258 (defun note-top-level-form (form &optional finalp)
1259 (when *compile-print*
1260 (cond ((not *top-level-form-noted*)
1261 (let ((*print-length* 2)
1263 (*print-pretty* nil))
1264 (with-compiler-io-syntax
1266 #-sb-xc-host "~&; ~:[compiling~;converting~] ~S"
1267 #+sb-xc-host "~&; ~:[x-compiling~;x-converting~] ~S"
1268 *block-compile* form)))
1271 (eq :top-level-forms *compile-print*)
1272 (neq form *top-level-form-noted*))
1273 (let ((*print-length* 1)
1275 (*print-pretty* nil))
1276 (with-compiler-io-syntax
1277 (compiler-mumble "~&; ... top level ~S" form)))
1280 *top-level-form-noted*))))
1282 ;;; Handle the evaluation the a :COMPILE-TOPLEVEL body during
1283 ;;; compilation. Normally just evaluate in the appropriate
1284 ;;; environment, but also compile if outputting a CFASL.
1285 (defun eval-compile-toplevel (body path)
1286 (eval-tlf `(progn ,@body) (source-path-tlf-number path) *lexenv*)
1287 (when *compile-toplevel-object*
1288 (let ((*compile-object* *compile-toplevel-object*))
1289 (convert-and-maybe-compile `(progn ,@body) path))))
1291 ;;; Process a top level FORM with the specified source PATH.
1292 ;;; * If this is a magic top level form, then do stuff.
1293 ;;; * If this is a macro, then expand it.
1294 ;;; * Otherwise, just compile it.
1296 ;;; COMPILE-TIME-TOO is as defined in ANSI
1297 ;;; "3.2.3.1 Processing of Top Level Forms".
1298 (defun process-toplevel-form (form path compile-time-too)
1299 (declare (list path))
1301 (catch 'process-toplevel-form-error-abort
1302 (let* ((path (or (get-source-path form) (cons form path)))
1303 (*current-path* path)
1304 (*compiler-error-bailout*
1305 (lambda (&optional condition)
1306 (convert-and-maybe-compile
1307 (make-compiler-error-form condition form)
1309 (throw 'process-toplevel-form-error-abort nil))))
1311 (flet ((default-processor (form)
1312 (let ((*top-level-form-noted* (note-top-level-form form)))
1313 ;; When we're cross-compiling, consider: what should we
1314 ;; do when we hit e.g.
1315 ;; (EVAL-WHEN (:COMPILE-TOPLEVEL)
1316 ;; (DEFUN FOO (X) (+ 7 X)))?
1317 ;; DEFUN has a macro definition in the cross-compiler,
1318 ;; and a different macro definition in the target
1319 ;; compiler. The only sensible thing is to use the
1320 ;; target compiler's macro definition, since the
1321 ;; cross-compiler's macro is in general into target
1322 ;; functions which can't meaningfully be executed at
1323 ;; cross-compilation time. So make sure we do the EVAL
1324 ;; here, before we macroexpand.
1326 ;; Then things get even dicier with something like
1327 ;; (DEFCONSTANT-EQX SB!XC:LAMBDA-LIST-KEYWORDS ..)
1328 ;; where we have to make sure that we don't uncross
1329 ;; the SB!XC: prefix before we do EVAL, because otherwise
1330 ;; we'd be trying to redefine the cross-compilation host's
1333 ;; (Isn't it fun to cross-compile Common Lisp?:-)
1336 (when compile-time-too
1337 (eval form)) ; letting xc host EVAL do its own macroexpansion
1338 (let* (;; (We uncross the operator name because things
1339 ;; like SB!XC:DEFCONSTANT and SB!XC:DEFTYPE
1340 ;; should be equivalent to their CL: counterparts
1341 ;; when being compiled as target code. We leave
1342 ;; the rest of the form uncrossed because macros
1343 ;; might yet expand into EVAL-WHEN stuff, and
1344 ;; things inside EVAL-WHEN can't be uncrossed
1345 ;; until after we've EVALed them in the
1346 ;; cross-compilation host.)
1347 (slightly-uncrossed (cons (uncross (first form))
1349 (expanded (preprocessor-macroexpand-1
1350 slightly-uncrossed)))
1351 (if (eq expanded slightly-uncrossed)
1352 ;; (Now that we're no longer processing toplevel
1353 ;; forms, and hence no longer need to worry about
1354 ;; EVAL-WHEN, we can uncross everything.)
1355 (convert-and-maybe-compile expanded path)
1356 ;; (We have to demote COMPILE-TIME-TOO to NIL
1357 ;; here, no matter what it was before, since
1358 ;; otherwise we'd tend to EVAL subforms more than
1359 ;; once, because of WHEN COMPILE-TIME-TOO form
1361 (process-toplevel-form expanded path nil))))
1362 ;; When we're not cross-compiling, we only need to
1363 ;; macroexpand once, so we can follow the 1-thru-6
1364 ;; sequence of steps in ANSI's "3.2.3.1 Processing of
1365 ;; Top Level Forms".
1367 (let ((expanded (preprocessor-macroexpand-1 form)))
1368 (cond ((eq expanded form)
1369 (when compile-time-too
1370 (eval-compile-toplevel (list form) path))
1371 (convert-and-maybe-compile form path))
1373 (process-toplevel-form expanded
1375 compile-time-too)))))))
1378 ;; (There are no xc EVAL-WHEN issues in the ATOM case until
1379 ;; (1) SBCL gets smart enough to handle global
1380 ;; DEFINE-SYMBOL-MACRO or SYMBOL-MACROLET and (2) SBCL
1381 ;; implementors start using symbol macros in a way which
1382 ;; interacts with SB-XC/CL distinction.)
1383 (convert-and-maybe-compile form path)
1385 (default-processor form)
1386 (flet ((need-at-least-one-arg (form)
1388 (compiler-error "~S form is too short: ~S"
1392 ;; In the cross-compiler, top level COLD-FSET arranges
1393 ;; for static linking at cold init time.
1396 (aver (not compile-time-too))
1397 (destructuring-bind (cold-fset fun-name lambda-expression) form
1398 (declare (ignore cold-fset))
1399 (process-toplevel-cold-fset fun-name
1402 ((eval-when macrolet symbol-macrolet);things w/ 1 arg before body
1403 (need-at-least-one-arg form)
1404 (destructuring-bind (special-operator magic &rest body) form
1405 (ecase special-operator
1407 ;; CT, LT, and E here are as in Figure 3-7 of ANSI
1408 ;; "3.2.3.1 Processing of Top Level Forms".
1409 (multiple-value-bind (ct lt e)
1410 (parse-eval-when-situations magic)
1411 (let ((new-compile-time-too (or ct
1412 (and compile-time-too
1414 (cond (lt (process-toplevel-progn
1415 body path new-compile-time-too))
1416 (new-compile-time-too
1417 (eval-compile-toplevel body path))))))
1419 (funcall-in-macrolet-lexenv
1421 (lambda (&key funs prepend)
1422 (declare (ignore funs))
1423 (aver (null prepend))
1424 (process-toplevel-locally body
1429 (funcall-in-symbol-macrolet-lexenv
1431 (lambda (&key vars prepend)
1432 (aver (null prepend))
1433 (process-toplevel-locally body
1439 (process-toplevel-locally (rest form) path compile-time-too))
1441 (process-toplevel-progn (rest form) path compile-time-too))
1442 (t (default-processor form))))))))
1446 ;;;; load time value support
1448 ;;;; (See EMIT-MAKE-LOAD-FORM.)
1450 ;;; Return T if we are currently producing a fasl file and hence
1451 ;;; constants need to be dumped carefully.
1452 (defun producing-fasl-file ()
1453 (fasl-output-p *compile-object*))
1455 ;;; Compile FORM and arrange for it to be called at load-time. Return
1456 ;;; the dumper handle and our best guess at the type of the object.
1457 (defun compile-load-time-value (form)
1458 (let ((lambda (compile-load-time-stuff form t)))
1460 (fasl-dump-load-time-value-lambda lambda *compile-object*)
1461 (let ((type (leaf-type lambda)))
1462 (if (fun-type-p type)
1463 (single-value-type (fun-type-returns type))
1466 ;;; Compile the FORMS and arrange for them to be called (for effect,
1467 ;;; not value) at load time.
1468 (defun compile-make-load-form-init-forms (forms)
1469 (let ((lambda (compile-load-time-stuff `(progn ,@forms) nil)))
1470 (fasl-dump-toplevel-lambda-call lambda *compile-object*)))
1472 ;;; Do the actual work of COMPILE-LOAD-TIME-VALUE or
1473 ;;; COMPILE-MAKE-LOAD-FORM-INIT-FORMS.
1474 (defun compile-load-time-stuff (form for-value)
1476 (let* ((*lexenv* (make-null-lexenv))
1477 (lambda (ir1-toplevel form *current-path* for-value nil)))
1478 (compile-toplevel (list lambda) t)
1481 ;;; This is called by COMPILE-TOPLEVEL when it was passed T for
1482 ;;; LOAD-TIME-VALUE-P (which happens in COMPILE-LOAD-TIME-STUFF). We
1483 ;;; don't try to combine this component with anything else and frob
1484 ;;; the name. If not in a :TOPLEVEL component, then don't bother
1485 ;;; compiling, because it was merged with a run-time component.
1486 (defun compile-load-time-value-lambda (lambdas)
1487 (aver (null (cdr lambdas)))
1488 (let* ((lambda (car lambdas))
1489 (component (lambda-component lambda)))
1490 (when (eql (component-kind component) :toplevel)
1491 (setf (component-name component) (leaf-debug-name lambda))
1492 (compile-component component)
1493 (clear-ir1-info component))))
1497 (defun object-call-toplevel-lambda (tll)
1498 (declare (type functional tll))
1499 (let ((object *compile-object*))
1501 (fasl-output (fasl-dump-toplevel-lambda-call tll object))
1502 (core-object (core-call-toplevel-lambda tll object))
1505 ;;; Smash LAMBDAS into a single component, compile it, and arrange for
1506 ;;; the resulting function to be called.
1507 (defun sub-compile-toplevel-lambdas (lambdas)
1508 (declare (list lambdas))
1510 (multiple-value-bind (component tll) (merge-toplevel-lambdas lambdas)
1511 (compile-component component)
1512 (clear-ir1-info component)
1513 (object-call-toplevel-lambda tll)))
1516 ;;; Compile top level code and call the top level lambdas. We pick off
1517 ;;; top level lambdas in non-top-level components here, calling
1518 ;;; SUB-c-t-l-l on each subsequence of normal top level lambdas.
1519 (defun compile-toplevel-lambdas (lambdas)
1520 (declare (list lambdas))
1521 (let ((len (length lambdas)))
1522 (flet ((loser (start)
1523 (or (position-if (lambda (x)
1524 (not (eq (component-kind
1525 (node-component (lambda-bind x)))
1528 ;; this used to read ":start start", but
1529 ;; start can be greater than len, which
1530 ;; is an error according to ANSI - CSR,
1532 :start (min start len))
1534 (do* ((start 0 (1+ loser))
1535 (loser (loser start) (loser start)))
1537 (sub-compile-toplevel-lambdas (subseq lambdas start loser))
1538 (unless (= loser len)
1539 (object-call-toplevel-lambda (elt lambdas loser))))))
1542 ;;; Compile LAMBDAS (a list of CLAMBDAs for top level forms) into the
1545 ;;; LOAD-TIME-VALUE-P seems to control whether it's MAKE-LOAD-FORM and
1546 ;;; COMPILE-LOAD-TIME-VALUE stuff. -- WHN 20000201
1547 (defun compile-toplevel (lambdas load-time-value-p)
1548 (declare (list lambdas))
1550 (maybe-mumble "locall ")
1551 (locall-analyze-clambdas-until-done lambdas)
1553 (maybe-mumble "IDFO ")
1554 (multiple-value-bind (components top-components hairy-top)
1555 (find-initial-dfo lambdas)
1556 (let ((all-components (append components top-components)))
1557 (when *check-consistency*
1558 (maybe-mumble "[check]~%")
1559 (check-ir1-consistency all-components))
1561 (dolist (component (append hairy-top top-components))
1562 (pre-physenv-analyze-toplevel component))
1564 (dolist (component components)
1565 (compile-component component)
1566 (replace-toplevel-xeps component))
1568 (when *check-consistency*
1569 (maybe-mumble "[check]~%")
1570 (check-ir1-consistency all-components))
1572 (if load-time-value-p
1573 (compile-load-time-value-lambda lambdas)
1574 (compile-toplevel-lambdas lambdas))
1576 (mapc #'clear-ir1-info components)
1580 ;;; Actually compile any stuff that has been queued up for block
1582 (defun finish-block-compilation ()
1583 (when *block-compile*
1584 (when *compile-print*
1585 (compiler-mumble "~&; block compiling converted top level forms..."))
1586 (when *toplevel-lambdas*
1587 (compile-toplevel (nreverse *toplevel-lambdas*) nil)
1588 (setq *toplevel-lambdas* ()))
1589 (setq *block-compile* nil)
1590 (setq *entry-points* nil)))
1592 (defun handle-condition-p (condition)
1594 (etypecase *compiler-error-context*
1596 (node-lexenv *compiler-error-context*))
1597 (compiler-error-context
1598 (let ((lexenv (compiler-error-context-lexenv
1599 *compiler-error-context*)))
1603 (let ((muffles (lexenv-handled-conditions lexenv)))
1604 (if (null muffles) ; common case
1606 (dolist (muffle muffles nil)
1607 (destructuring-bind (typespec . restart-name) muffle
1608 (when (and (typep condition typespec)
1609 (find-restart restart-name condition))
1612 (defun handle-condition-handler (condition)
1614 (etypecase *compiler-error-context*
1616 (node-lexenv *compiler-error-context*))
1617 (compiler-error-context
1618 (let ((lexenv (compiler-error-context-lexenv
1619 *compiler-error-context*)))
1623 (let ((muffles (lexenv-handled-conditions lexenv)))
1625 (dolist (muffle muffles (bug "fell through"))
1626 (destructuring-bind (typespec . restart-name) muffle
1627 (when (typep condition typespec)
1628 (awhen (find-restart restart-name condition)
1629 (invoke-restart it))))))))
1631 ;;; Read all forms from INFO and compile them, with output to OBJECT.
1632 ;;; Return (VALUES ABORT-P WARNINGS-P FAILURE-P).
1633 (defun sub-compile-file (info)
1634 (declare (type source-info info))
1635 (let ((*package* (sane-package))
1636 (*readtable* *readtable*)
1637 (sb!xc:*compile-file-pathname* nil) ; really bound in
1638 (sb!xc:*compile-file-truename* nil) ; SUB-SUB-COMPILE-FILE
1640 (*code-coverage-records* (make-hash-table :test 'equal))
1641 (*code-coverage-blocks* (make-hash-table :test 'equal))
1642 (*handled-conditions* *handled-conditions*)
1643 (*disabled-package-locks* *disabled-package-locks*)
1644 (*lexenv* (make-null-lexenv))
1645 (*block-compile* *block-compile-arg*)
1646 (*toplevel-lambdas* ())
1647 (*fun-names-in-this-file* ())
1648 (*allow-instrumenting* nil)
1649 (*compiler-error-bailout*
1651 (compiler-mumble "~2&; fatal error, aborting compilation~%")
1652 (return-from sub-compile-file (values t t t))))
1653 (*current-path* nil)
1654 (*last-source-context* nil)
1655 (*last-original-source* nil)
1656 (*last-source-form* nil)
1657 (*last-format-string* nil)
1658 (*last-format-args* nil)
1659 (*last-message-count* 0)
1660 ;; FIXME: Do we need this rebinding here? It's a literal
1661 ;; translation of the old CMU CL rebinding to
1662 ;; (OR *BACKEND-INFO-ENVIRONMENT* *INFO-ENVIRONMENT*),
1663 ;; and it's not obvious whether the rebinding to itself is
1664 ;; needed that SBCL doesn't need *BACKEND-INFO-ENVIRONMENT*.
1665 (*info-environment* *info-environment*)
1666 (*compiler-sset-counter* 0)
1667 (sb!xc:*gensym-counter* 0))
1669 (handler-bind (((satisfies handle-condition-p) #'handle-condition-handler))
1670 (with-compilation-values
1671 (sb!xc:with-compilation-unit ()
1674 (sub-sub-compile-file info)
1676 (unless (zerop (hash-table-count *code-coverage-records*))
1677 ;; Dump the code coverage records into the fasl.
1678 (fopcompile `(record-code-coverage
1679 ',(namestring *compile-file-pathname*)
1681 (maphash (lambda (k v)
1682 (declare (ignore k))
1684 *code-coverage-records*)
1689 (finish-block-compilation)
1690 (let ((object *compile-object*))
1692 (fasl-output (fasl-dump-source-info info object))
1693 (core-object (fix-core-source-info info object))
1696 ;; Some errors are sufficiently bewildering that we just fail
1697 ;; immediately, without trying to recover and compile more of
1699 (fatal-compiler-error (condition)
1701 (fresh-line *error-output*)
1702 (pprint-logical-block (*error-output* nil :per-line-prefix "; ")
1703 (format *error-output*
1704 "~@<~@:_compilation aborted because of fatal error: ~2I~_~A~@:_~:>"
1705 (encapsulated-condition condition)))
1706 (finish-output *error-output*)
1709 ;;; Return a pathname for the named file. The file must exist.
1710 (defun verify-source-file (pathname-designator)
1711 (let* ((pathname (pathname pathname-designator))
1712 (default-host (make-pathname :host (pathname-host pathname))))
1713 (flet ((try-with-type (path type error-p)
1714 (let ((new (merge-pathnames
1715 path (make-pathname :type type
1716 :defaults default-host))))
1717 (if (probe-file new)
1719 (and error-p (truename new))))))
1720 (cond ((typep pathname 'logical-pathname)
1721 (try-with-type pathname "LISP" t))
1722 ((probe-file pathname) pathname)
1723 ((try-with-type pathname "lisp" nil))
1724 ((try-with-type pathname "lisp" t))))))
1726 (defun elapsed-time-to-string (internal-time-delta)
1727 (multiple-value-bind (tsec remainder)
1728 (truncate internal-time-delta internal-time-units-per-second)
1729 (let ((ms (truncate remainder (/ internal-time-units-per-second 1000))))
1730 (multiple-value-bind (tmin sec) (truncate tsec 60)
1731 (multiple-value-bind (thr min) (truncate tmin 60)
1732 (format nil "~D:~2,'0D:~2,'0D.~3,'0D" thr min sec ms))))))
1734 ;;; Print some junk at the beginning and end of compilation.
1735 (defun print-compile-start-note (source-info)
1736 (declare (type source-info source-info))
1737 (let ((file-info (source-info-file-info source-info)))
1738 (compiler-mumble "~&; compiling file ~S (written ~A):~%"
1739 (namestring (file-info-name file-info))
1740 (sb!int:format-universal-time nil
1741 (file-info-write-date
1745 :print-timezone nil)))
1748 (defun print-compile-end-note (source-info won)
1749 (declare (type source-info source-info))
1750 (compiler-mumble "~&; compilation ~:[aborted after~;finished in~] ~A~&"
1752 (elapsed-time-to-string
1753 (- (get-internal-real-time)
1754 (source-info-start-real-time source-info))))
1757 ;;; Open some files and call SUB-COMPILE-FILE. If something unwinds
1758 ;;; out of the compile, then abort the writing of the output file, so
1759 ;;; that we don't overwrite it with known garbage.
1760 (defun sb!xc:compile-file
1765 (output-file (cfp-output-file-default input-file))
1766 ;; FIXME: ANSI doesn't seem to say anything about
1767 ;; *COMPILE-VERBOSE* and *COMPILE-PRINT* being rebound by this
1769 ((:verbose sb!xc:*compile-verbose*) sb!xc:*compile-verbose*)
1770 ((:print sb!xc:*compile-print*) sb!xc:*compile-print*)
1771 (external-format :default)
1775 ((:block-compile *block-compile-arg*) nil)
1776 (emit-cfasl *emit-cfasl*))
1778 "Compile INPUT-FILE, producing a corresponding fasl file and
1779 returning its filename.
1782 If true, a message per non-macroexpanded top level form is printed
1783 to *STANDARD-OUTPUT*. Top level forms that whose subforms are
1784 processed as top level forms (eg. EVAL-WHEN, MACROLET, PROGN) receive
1785 no such message, but their subforms do.
1787 As an extension to ANSI, if :PRINT is :top-level-forms, a message
1788 per top level form after macroexpansion is printed to *STANDARD-OUTPUT*.
1789 For example, compiling an IN-PACKAGE form will result in a message about
1790 a top level SETQ in addition to the message about the IN-PACKAGE form'
1793 Both forms of reporting obey the SB-EXT:*COMPILER-PRINT-VARIABLE-ALIST*.
1796 Though COMPILE-FILE accepts an additional :BLOCK-COMPILE
1797 argument, it is not currently supported. (non-standard)
1800 If given, internal data structures are dumped to the specified
1801 file, or if a value of T is given, to a file of *.trace type
1802 derived from the input file name. (non-standard)
1805 (Experimental). If true, outputs the toplevel compile-time effects
1806 of this file into a separate .cfasl file."
1807 ;;; Block compilation is currently broken.
1809 "Also, as a workaround for vaguely-non-ANSI behavior, the
1810 :BLOCK-COMPILE argument is quasi-supported, to determine whether
1811 multiple functions are compiled together as a unit, resolving function
1812 references at compile time. NIL means that global function names are
1813 never resolved at compilation time. Currently NIL is the default
1814 behavior, because although section 3.2.2.3, \"Semantic Constraints\",
1815 of the ANSI spec allows this behavior under all circumstances, the
1816 compiler's runtime scales badly when it tries to do this for large
1817 files. If/when this performance problem is fixed, the block
1818 compilation default behavior will probably be made dependent on the
1819 SPEED and COMPILATION-SPEED optimization values, and the
1820 :BLOCK-COMPILE argument will probably become deprecated."
1822 (let* ((fasl-output nil)
1824 (output-file-name nil)
1825 (coutput-file-name nil)
1828 (failure-p t) ; T in case error keeps this from being set later
1829 (input-pathname (verify-source-file input-file))
1830 (source-info (make-file-source-info input-pathname external-format))
1831 (*compiler-trace-output* nil)) ; might be modified below
1836 (setq output-file-name
1837 (sb!xc:compile-file-pathname input-file
1838 :output-file output-file))
1840 (open-fasl-output output-file-name
1841 (namestring input-pathname))))
1843 (setq coutput-file-name
1844 (make-pathname :type "cfasl"
1845 :defaults output-file-name))
1847 (open-fasl-output coutput-file-name
1848 (namestring input-pathname))))
1850 (let* ((default-trace-file-pathname
1851 (make-pathname :type "trace" :defaults input-pathname))
1852 (trace-file-pathname
1853 (if (eql trace-file t)
1854 default-trace-file-pathname
1855 (merge-pathnames trace-file
1856 default-trace-file-pathname))))
1857 (setf *compiler-trace-output*
1858 (open trace-file-pathname
1859 :if-exists :supersede
1860 :direction :output))))
1862 (when sb!xc:*compile-verbose*
1863 (print-compile-start-note source-info))
1865 (let ((*compile-object* fasl-output)
1866 (*compile-toplevel-object* cfasl-output))
1867 (setf (values abort-p warnings-p failure-p)
1868 (sub-compile-file source-info))))
1870 (close-source-info source-info)
1873 (close-fasl-output fasl-output abort-p)
1874 (setq output-file-name
1875 (pathname (fasl-output-stream fasl-output)))
1876 (when (and (not abort-p) sb!xc:*compile-verbose*)
1877 (compiler-mumble "~2&; ~A written~%" (namestring output-file-name))))
1880 (close-fasl-output cfasl-output abort-p)
1881 (when (and (not abort-p) sb!xc:*compile-verbose*)
1882 (compiler-mumble "; ~A written~%" (namestring coutput-file-name))))
1884 (when sb!xc:*compile-verbose*
1885 (print-compile-end-note source-info (not abort-p)))
1887 (when *compiler-trace-output*
1888 (close *compiler-trace-output*)))
1890 ;; CLHS says that the first value is NIL if the "file could not
1891 ;; be created". We interpret this to mean "a valid fasl could not
1892 ;; be created" -- which can happen if the compilation is aborted
1893 ;; before the whole file has been processed, due to eg. a reader
1895 (values (when (and (not abort-p) output-file)
1896 ;; Hack around filesystem race condition...
1897 (or (probe-file output-file-name) output-file-name))
1901 ;;; a helper function for COMPILE-FILE-PATHNAME: the default for
1902 ;;; the OUTPUT-FILE argument
1904 ;;; ANSI: The defaults for the OUTPUT-FILE are taken from the pathname
1905 ;;; that results from merging the INPUT-FILE with the value of
1906 ;;; *DEFAULT-PATHNAME-DEFAULTS*, except that the type component should
1907 ;;; default to the appropriate implementation-defined default type for
1909 (defun cfp-output-file-default (input-file)
1910 (let* ((defaults (merge-pathnames input-file *default-pathname-defaults*))
1911 (retyped (make-pathname :type *fasl-file-type* :defaults defaults)))
1914 ;;; KLUDGE: Part of the ANSI spec for this seems contradictory:
1915 ;;; If INPUT-FILE is a logical pathname and OUTPUT-FILE is unsupplied,
1916 ;;; the result is a logical pathname. If INPUT-FILE is a logical
1917 ;;; pathname, it is translated into a physical pathname as if by
1918 ;;; calling TRANSLATE-LOGICAL-PATHNAME.
1919 ;;; So I haven't really tried to make this precisely ANSI-compatible
1920 ;;; at the level of e.g. whether it returns logical pathname or a
1921 ;;; physical pathname. Patches to make it more correct are welcome.
1922 ;;; -- WHN 2000-12-09
1923 (defun sb!xc:compile-file-pathname (input-file
1925 (output-file nil output-file-p)
1928 "Return a pathname describing what file COMPILE-FILE would write to given
1931 (merge-pathnames output-file (cfp-output-file-default input-file))
1932 (cfp-output-file-default input-file)))
1934 ;;;; MAKE-LOAD-FORM stuff
1936 ;;; The entry point for MAKE-LOAD-FORM support. When IR1 conversion
1937 ;;; finds a constant structure, it invokes this to arrange for proper
1938 ;;; dumping. If it turns out that the constant has already been
1939 ;;; dumped, then we don't need to do anything.
1941 ;;; If the constant hasn't been dumped, then we check to see whether
1942 ;;; we are in the process of creating it. We detect this by
1943 ;;; maintaining the special *CONSTANTS-BEING-CREATED* as a list of all
1944 ;;; the constants we are in the process of creating. Actually, each
1945 ;;; entry is a list of the constant and any init forms that need to be
1946 ;;; processed on behalf of that constant.
1948 ;;; It's not necessarily an error for this to happen. If we are
1949 ;;; processing the init form for some object that showed up *after*
1950 ;;; the original reference to this constant, then we just need to
1951 ;;; defer the processing of that init form. To detect this, we
1952 ;;; maintain *CONSTANTS-CREATED-SINCE-LAST-INIT* as a list of the
1953 ;;; constants created since the last time we started processing an
1954 ;;; init form. If the constant passed to emit-make-load-form shows up
1955 ;;; in this list, then there is a circular chain through creation
1956 ;;; forms, which is an error.
1958 ;;; If there is some intervening init form, then we blow out of
1959 ;;; processing it by throwing to the tag PENDING-INIT. The value we
1960 ;;; throw is the entry from *CONSTANTS-BEING-CREATED*. This is so the
1961 ;;; offending init form can be tacked onto the init forms for the
1962 ;;; circular object.
1964 ;;; If the constant doesn't show up in *CONSTANTS-BEING-CREATED*, then
1965 ;;; we have to create it. We call MAKE-LOAD-FORM and check to see
1966 ;;; whether the creation form is the magic value
1967 ;;; :SB-JUST-DUMP-IT-NORMALLY. If it is, then we don't do anything. The
1968 ;;; dumper will eventually get its hands on the object and use the
1969 ;;; normal structure dumping noise on it.
1971 ;;; Otherwise, we bind *CONSTANTS-BEING-CREATED* and
1972 ;;; *CONSTANTS-CREATED-SINCE- LAST-INIT* and compile the creation form
1973 ;;; much the way LOAD-TIME-VALUE does. When this finishes, we tell the
1974 ;;; dumper to use that result instead whenever it sees this constant.
1976 ;;; Now we try to compile the init form. We bind
1977 ;;; *CONSTANTS-CREATED-SINCE-LAST-INIT* to NIL and compile the init
1978 ;;; form (and any init forms that were added because of circularity
1979 ;;; detection). If this works, great. If not, we add the init forms to
1980 ;;; the init forms for the object that caused the problems and let it
1982 (defvar *constants-being-created* nil)
1983 (defvar *constants-created-since-last-init* nil)
1984 ;;; FIXME: Shouldn't these^ variables be unbound outside LET forms?
1985 (defun emit-make-load-form (constant &optional (name nil namep))
1986 (aver (fasl-output-p *compile-object*))
1987 (unless (or (fasl-constant-already-dumped-p constant *compile-object*)
1988 ;; KLUDGE: This special hack is because I was too lazy
1989 ;; to rework DEF!STRUCT so that the MAKE-LOAD-FORM
1990 ;; function of LAYOUT returns nontrivial forms when
1991 ;; building the cross-compiler but :IGNORE-IT when
1992 ;; cross-compiling or running under the target Lisp. --
1994 #+sb-xc-host (typep constant 'layout))
1995 (let ((circular-ref (assoc constant *constants-being-created* :test #'eq)))
1997 (when (find constant *constants-created-since-last-init* :test #'eq)
1999 (throw 'pending-init circular-ref)))
2000 (multiple-value-bind (creation-form init-form)
2002 ;; If the constant is a reference to a named constant, we can
2003 ;; just use SYMBOL-VALUE during LOAD.
2004 (values `(symbol-value ',name) nil)
2006 (sb!xc:make-load-form constant (make-null-lexenv))
2008 (compiler-error condition))))
2010 (:sb-just-dump-it-normally
2011 (fasl-validate-structure constant *compile-object*)
2016 (let* ((name (write-to-string constant :level 1 :length 2))
2018 (list constant name init-form)
2020 (let ((*constants-being-created*
2021 (cons info *constants-being-created*))
2022 (*constants-created-since-last-init*
2023 (cons constant *constants-created-since-last-init*)))
2026 (fasl-note-handle-for-constant
2028 (compile-load-time-value
2032 (compiler-error "circular references in creation form for ~S"
2035 (let* ((*constants-created-since-last-init* nil)
2037 (catch 'pending-init
2038 (loop for (name form) on (cdr info) by #'cddr
2039 collect name into names
2040 collect form into forms
2041 finally (compile-make-load-form-init-forms forms))
2044 (setf (cdr circular-ref)
2045 (append (cdr circular-ref) (cdr info))))))))))))
2048 ;;;; Host compile time definitions
2050 (defun compile-in-lexenv (name lambda lexenv)
2051 (declare (ignore lexenv))
2052 (compile name lambda))
2055 (defun eval-tlf (form index &optional lexenv)
2056 (declare (ignore index lexenv))
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