1 ;;; introspection library
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
12 ;;; For the avoidance of doubt, the exported interface is the supported
13 ;;; interface. Anything else is internal, though you're welcome to argue a
14 ;;; case for exporting it.
16 ;;; If you steal the code from this file to cut and paste into your
17 ;;; own project, there will be much wailing and gnashing of teeth.
18 ;;; Your teeth. If need be, we'll kick them for you. This is a
19 ;;; contrib, we're allowed to look in internals. You're an
20 ;;; application programmer, and are not.
23 ;;; 1) structs don't have within-file location info. problem for the
24 ;;; structure itself, accessors and the predicate
25 ;;; 3) error handling. Signal random errors, or handle and resignal 'our'
26 ;;; error, or return NIL?
29 (defpackage :sb-introspect
31 (:export "ALLOCATION-INFORMATION"
33 "FUNCTION-LAMBDA-LIST"
36 "VALID-FUNCTION-NAME-P"
37 "FIND-DEFINITION-SOURCE"
38 "FIND-DEFINITION-SOURCES-BY-NAME"
40 "DEFINITION-SOURCE-PATHNAME"
41 "DEFINITION-SOURCE-FORM-PATH"
42 "DEFINITION-SOURCE-CHARACTER-OFFSET"
43 "DEFINITION-SOURCE-FILE-WRITE-DATE"
44 "DEFINITION-SOURCE-PLIST"
45 "DEFINITION-NOT-FOUND" "DEFINITION-NAME"
46 "FIND-FUNCTION-CALLEES"
47 "FIND-FUNCTION-CALLERS"
54 "WHO-SPECIALIZES-DIRECTLY"
55 "WHO-SPECIALIZES-GENERALLY"))
57 (in-package :sb-introspect)
59 ;;;; Internal interface for SBCL debug info
61 ;;; Here are some tutorial-style type definitions to help understand
62 ;;; the internal SBCL debugging data structures we're using. The
63 ;;; commentary is based on CMUCL's debug internals manual.
65 (deftype debug-info ()
66 "Structure containing all the debug information related to a function.
67 Function objects reference debug-infos which in turn reference
68 debug-sources and so on."
69 'sb-c::compiled-debug-info)
71 (deftype debug-source ()
72 "Debug sources describe where to find source code.
73 For example, the debug source for a function compiled from a file will
74 include the pathname of the file and the position of the definition."
77 (deftype debug-function ()
78 "Debug function represent static compile-time information about a function."
79 'sb-c::compiled-debug-fun)
81 (declaim (ftype (function (function) debug-info) function-debug-info))
82 (defun function-debug-info (function)
83 (let* ((function-object (sb-kernel::%fun-fun function))
84 (function-header (sb-kernel:fun-code-header function-object)))
85 (sb-kernel:%code-debug-info function-header)))
87 (declaim (ftype (function (function) debug-source) function-debug-source))
88 (defun function-debug-source (function)
89 (debug-info-source (function-debug-info function)))
91 (declaim (ftype (function (debug-info) debug-source) debug-info-source))
92 (defun debug-info-source (debug-info)
93 (sb-c::debug-info-source debug-info))
95 (declaim (ftype (function (debug-info) debug-function) debug-info-debug-function))
96 (defun debug-info-debug-function (debug-info)
97 (elt (sb-c::compiled-debug-info-fun-map debug-info) 0))
99 (defun valid-function-name-p (name)
100 "True if NAME denotes a valid function name, ie. one that can be passed to
102 (and (sb-int:valid-function-name-p name) t))
104 ;;;; Finding definitions
106 (defstruct definition-source
107 ;; Pathname of the source file that the definition was compiled from.
108 ;; This is null if the definition was not compiled from a file.
109 (pathname nil :type (or null pathname))
110 ;; Source-path of the definition within the file.
111 ;; This may be incomplete depending on the debug level at which the
112 ;; source was compiled.
113 (form-path '() :type list)
114 ;; Character offset of the top-level-form containing the definition.
115 ;; This corresponds to the first element of form-path.
116 (character-offset nil :type (or null integer))
117 ;; File-write-date of the source file when compiled.
118 ;; Null if not compiled from a file.
119 (file-write-date nil :type (or null integer))
120 ;; plist from WITH-COMPILATION-UNIT
122 ;; Any extra metadata that the caller might be interested in. For
123 ;; example the specializers of the method whose definition-source this
125 (description nil :type list))
127 (defun find-definition-sources-by-name (name type)
128 "Returns a list of DEFINITION-SOURCEs for the objects of type TYPE
129 defined with name NAME. NAME may be a symbol or a extended function
130 name. Type can currently be one of the following:
155 If an unsupported TYPE is requested, the function will return NIL.
163 (find-class name nil)))
164 (real-fdefinition (name)
165 ;; for getting the real function object, even if the
166 ;; function is being profiled
167 (let ((profile-info (gethash name sb-profile::*profiled-fun-name->info*)))
169 (sb-profile::profile-info-encapsulated-fun profile-info)
170 (fdefinition name)))))
174 (when (and (symbolp name)
175 (eq (sb-int:info :variable :kind name) :special))
176 (translate-source-location (sb-int:info :source-location type name))))
178 (when (and (symbolp name)
179 (eq (sb-int:info :variable :kind name) :constant))
180 (translate-source-location (sb-int:info :source-location type name))))
182 (when (and (symbolp name)
183 (eq (sb-int:info :variable :kind name) :macro))
184 (translate-source-location (sb-int:info :source-location type name))))
186 (when (and (symbolp name)
187 (macro-function name))
188 (find-definition-source (macro-function name))))
190 (when (compiler-macro-function name)
191 (find-definition-source (compiler-macro-function name))))
192 ((:function :generic-function)
193 (when (and (fboundp name)
194 (or (not (symbolp name))
195 (not (macro-function name))))
196 (let ((fun (real-fdefinition name)))
197 (when (eq (not (typep fun 'generic-function))
198 (not (eq type :generic-function)))
199 (find-definition-source fun)))))
201 ;; Source locations for types are saved separately when the expander
202 ;; is a closure without a good source-location.
203 (let ((loc (sb-int:info :type :source-location name)))
205 (translate-source-location loc)
206 (let ((expander-fun (sb-int:info :type :expander name)))
208 (find-definition-source expander-fun))))))
211 (let ((fun (real-fdefinition name)))
212 (when (typep fun 'generic-function)
213 (loop for method in (sb-mop::generic-function-methods
215 for source = (find-definition-source method)
216 when source collect source)))))
218 (when (and (consp name)
219 (eq (car name) 'setf))
220 (setf name (cadr name)))
221 (let ((expander (or (sb-int:info :setf :inverse name)
222 (sb-int:info :setf :expander name))))
224 (sb-introspect:find-definition-source (if (symbolp expander)
225 (symbol-function expander)
228 (let ((class (get-class name)))
230 (when (typep class 'sb-pcl::structure-class)
231 (find-definition-source class))
232 (when (sb-int:info :typed-structure :info name)
233 (translate-source-location
234 (sb-int:info :source-location :typed-structure name))))))
236 (let ((class (get-class name)))
238 (not (typep class 'sb-pcl::structure-class)))
239 (when (eq (not (typep class 'sb-pcl::condition-class))
240 (not (eq type :condition)))
241 (find-definition-source class)))))
242 ((:method-combination)
243 (let ((combination-fun
244 (find-method #'sb-mop:find-method-combination
246 (list (find-class 'generic-function)
250 (when combination-fun
251 (find-definition-source combination-fun))))
254 (let ((package (find-package name)))
256 (find-definition-source package)))))
257 ;; TRANSFORM and OPTIMIZER handling from swank-sbcl
260 (let ((fun-info (sb-int:info :function :info name)))
262 (loop for xform in (sb-c::fun-info-transforms fun-info)
263 for source = (find-definition-source
264 (sb-c::transform-function xform))
265 for typespec = (sb-kernel:type-specifier
266 (sb-c::transform-type xform))
267 for note = (sb-c::transform-note xform)
268 do (setf (definition-source-description source)
270 (list (second typespec) note)
275 (let ((fun-info (sb-int:info :function :info name)))
277 (let ((otypes '((sb-c::fun-info-derive-type . sb-c:derive-type)
278 (sb-c::fun-info-ltn-annotate . sb-c:ltn-annotate)
279 (sb-c::fun-info-ltn-annotate . sb-c:ltn-annotate)
280 (sb-c::fun-info-optimizer . sb-c:optimizer))))
281 (loop for (reader . name) in otypes
282 for fn = (funcall reader fun-info)
284 (let ((source (find-definition-source fn)))
285 (setf (definition-source-description source)
290 (let ((fun-info (sb-int:info :function :info name)))
292 (loop for vop in (sb-c::fun-info-templates fun-info)
293 for source = (find-definition-source
294 (sb-c::vop-info-generator-function vop))
295 do (setf (definition-source-description source)
296 (list (sb-c::template-name vop)
297 (sb-c::template-note vop)))
301 (let ((transform-fun (sb-int:info :function :source-transform name)))
303 (sb-introspect:find-definition-source transform-fun)))))
307 (defun find-definition-source (object)
309 ((or sb-pcl::condition-class sb-pcl::structure-class)
310 (let ((classoid (sb-impl::find-classoid (class-name object))))
312 (let ((layout (sb-impl::classoid-layout classoid)))
314 (translate-source-location
315 (sb-kernel::layout-source-location layout)))))))
318 (find-definition-sources-by-name
319 (sb-pcl::method-combination-type-name object) :method-combination)))
321 (translate-source-location (sb-impl::package-source-location object)))
323 (translate-source-location (sb-pcl::definition-source object)))
324 ;; Use the PCL definition location information instead of the function
325 ;; debug-info for methods and generic functions. Sometimes the
326 ;; debug-info would point into PCL internals instead of the proper
329 (let ((source (translate-source-location
330 (sb-pcl::definition-source object))))
332 (setf (definition-source-description source)
333 (list (sb-mop:generic-function-lambda-list object))))
336 (let ((source (translate-source-location
337 (sb-pcl::definition-source object))))
339 (setf (definition-source-description source)
340 (append (method-qualifiers object)
341 (if (sb-mop:method-generic-function object)
342 (sb-pcl::unparse-specializers
343 (sb-mop:method-generic-function object)
344 (sb-mop:method-specializers object))
345 (sb-mop:method-specializers object)))))
348 (sb-eval:interpreted-function
349 (let ((source (translate-source-location
350 (sb-eval:interpreted-function-source-location object))))
353 (cond ((struct-accessor-p object)
354 (find-definition-source
355 (struct-accessor-structure-class object)))
356 ((struct-predicate-p object)
357 (find-definition-source
358 (struct-predicate-structure-class object)))
360 (find-function-definition-source object))))
361 ((or condition standard-object structure-object)
362 (find-definition-source (class-of object)))
364 (error "Don't know how to retrieve source location for a ~S"
367 (defun find-function-definition-source (function)
368 (let* ((debug-info (function-debug-info function))
369 (debug-source (debug-info-source debug-info))
370 (debug-fun (debug-info-debug-function debug-info))
371 (tlf (if debug-fun (sb-c::compiled-debug-fun-tlf-number debug-fun))))
372 (make-definition-source
374 ;; KLUDGE: at the moment, we don't record the correct toplevel
375 ;; form number for forms processed by EVAL (including EVAL-WHEN
376 ;; :COMPILE-TOPLEVEL). Until that's fixed, don't return a
377 ;; DEFINITION-SOURCE with a pathname. (When that's fixed, take
378 ;; out the (not (debug-source-form ...)) test.
379 (when (stringp (sb-c::debug-source-namestring debug-source))
380 (parse-namestring (sb-c::debug-source-namestring debug-source)))
383 (elt (sb-c::debug-source-start-positions debug-source) tlf))
384 ;; Unfortunately there is no proper source path available in the
385 ;; debug-source. FIXME: We could use sb-di:code-locations to get
386 ;; a full source path. -luke (12/Mar/2005)
387 :form-path (if tlf (list tlf))
388 :file-write-date (sb-c::debug-source-created debug-source)
389 :plist (sb-c::debug-source-plist debug-source))))
391 (defun translate-source-location (location)
393 (make-definition-source
394 :pathname (let ((n (sb-c:definition-source-location-namestring location)))
396 (parse-namestring n)))
398 (let ((number (sb-c:definition-source-location-toplevel-form-number
402 :plist (sb-c:definition-source-location-plist location))
403 (make-definition-source)))
405 ;;; This is kludgey. We expect these functions (the underlying functions,
406 ;;; not the closures) to be in static space and so not move ever.
407 ;;; FIXME It's also possibly wrong: not all structures use these vanilla
408 ;;; accessors, e.g. when the :type option is used
409 (defvar *struct-slotplace-reader*
410 (sb-vm::%simple-fun-self #'definition-source-pathname))
411 (defvar *struct-slotplace-writer*
412 (sb-vm::%simple-fun-self #'(setf definition-source-pathname)))
413 (defvar *struct-predicate*
414 (sb-vm::%simple-fun-self #'definition-source-p))
416 (defun struct-accessor-p (function)
417 (let ((self (sb-vm::%simple-fun-self function)))
418 ;; FIXME there are other kinds of struct accessor. Fill out this list
419 (member self (list *struct-slotplace-reader*
420 *struct-slotplace-writer*))))
422 (defun struct-predicate-p (function)
423 (let ((self (sb-vm::%simple-fun-self function)))
424 ;; FIXME there may be other structure predicate functions
425 (member self (list *struct-predicate*))))
427 (sb-int:define-deprecated-function :late "1.0.24.5" function-arglist function-lambda-list
429 (function-lambda-list function))
431 (defun function-lambda-list (function)
432 "Describe the lambda list for the extended function designator FUNCTION.
433 Works for special-operators, macros, simple functions, interpreted functions,
434 and generic functions. Signals an error if FUNCTION is not a valid extended
435 function designator."
436 (cond ((valid-function-name-p function)
437 (function-lambda-list (or (and (symbolp function)
438 (macro-function function))
439 (fdefinition function))))
440 ((typep function 'generic-function)
441 (sb-pcl::generic-function-pretty-arglist function))
443 ((typep function 'sb-eval:interpreted-function)
444 (sb-eval:interpreted-function-lambda-list function))
446 (sb-kernel:%simple-fun-arglist (sb-kernel:%fun-fun function)))))
448 (defun deftype-lambda-list (typespec-operator)
449 "Returns the lambda list of TYPESPEC-OPERATOR as first return
450 value, and a flag whether the arglist could be found as second
452 (check-type typespec-operator symbol)
453 (case (sb-int:info :type :kind typespec-operator)
455 (sb-int:info :type :lambda-list typespec-operator))
457 (let ((translator-fun (sb-int:info :type :translator typespec-operator)))
459 (values (sb-kernel:%fun-lambda-list translator-fun) t)
460 ;; Some builtin types (e.g. STRING) do not have a
461 ;; translator, but they were actually defined via DEFTYPE
462 ;; in src/code/deftypes-for-target.lisp.
463 (sb-int:info :type :lambda-list typespec-operator))))
464 (t (values nil nil))))
466 (defun function-type (function-designator)
467 "Returns the ftype of FUNCTION-DESIGNATOR, or NIL."
468 (flet ((ftype-of (function-designator)
469 (sb-kernel:type-specifier
470 (sb-int:info :function :type function-designator))))
471 (etypecase function-designator
473 (when (and (fboundp function-designator)
474 (not (macro-function function-designator))
475 (not (special-operator-p function-designator)))
476 (ftype-of function-designator)))
478 (when (and (sb-int:legal-fun-name-p function-designator)
479 (fboundp function-designator))
480 (ftype-of function-designator)))
482 (function-type (sb-pcl:generic-function-name function-designator)))
484 ;; Give declared type in globaldb priority over derived type
485 ;; because it contains more accurate information e.g. for
487 (let ((type (function-type (sb-kernel:%fun-name
488 (sb-impl::%fun-fun function-designator)))))
491 (sb-impl::%fun-type function-designator)))))))
493 (defun struct-accessor-structure-class (function)
494 (let ((self (sb-vm::%simple-fun-self function)))
496 ((member self (list *struct-slotplace-reader* *struct-slotplace-writer*))
498 (sb-kernel::classoid-name
499 (sb-kernel::layout-classoid
500 (sb-kernel:%closure-index-ref function 1)))))
503 (defun struct-predicate-structure-class (function)
504 (let ((self (sb-vm::%simple-fun-self function)))
506 ((member self (list *struct-predicate*))
508 (sb-kernel::classoid-name
509 (sb-kernel::layout-classoid
510 (sb-kernel:%closure-index-ref function 0)))))
513 ;;;; find callers/callees, liberated from Helmut Eller's code in SLIME
515 ;;; This interface is trmendously experimental.
517 ;;; For the moment I'm taking the view that FDEFN is an internal
518 ;;; object (one out of one CMUCL developer surveyed didn't know what
519 ;;; they were for), so these routines deal in FUNCTIONs
521 ;;; Find callers and callees by looking at the constant pool of
522 ;;; compiled code objects. We assume every fdefn object in the
523 ;;; constant pool corresponds to a call to that function. A better
524 ;;; strategy would be to use the disassembler to find actual
527 (defun find-function-callees (function)
528 "Return functions called by FUNCTION."
531 (sb-kernel:fun-code-header function)
533 (when (sb-kernel:fdefn-p obj)
534 (push (sb-kernel:fdefn-fun obj)
539 (defun find-function-callers (function &optional (spaces '(:read-only :static
541 "Return functions which call FUNCTION, by searching SPACES for code objects"
542 (let ((referrers '()))
543 (map-caller-code-components
547 (let ((entry (sb-kernel:%code-entry-points code)))
549 (push (princ-to-string code) referrers))
551 (loop for e = entry then (sb-kernel::%simple-fun-next e)
553 do (pushnew e referrers)))))))
556 (declaim (inline map-code-constants))
557 (defun map-code-constants (code fn)
558 "Call FN for each constant in CODE's constant pool."
559 (check-type code sb-kernel:code-component)
560 (loop for i from sb-vm:code-constants-offset below
561 (sb-kernel:get-header-data code)
562 do (funcall fn (sb-kernel:code-header-ref code i))))
564 (declaim (inline map-allocated-code-components))
565 (defun map-allocated-code-components (spaces fn)
566 "Call FN for each allocated code component in one of SPACES. FN
567 receives the object and its size as arguments. SPACES should be a
568 list of the symbols :dynamic, :static, or :read-only."
569 (dolist (space spaces)
570 (sb-vm::map-allocated-objects
571 (lambda (obj header size)
572 (when (= sb-vm:code-header-widetag header)
573 (funcall fn obj size)))
577 (declaim (inline map-caller-code-components))
578 (defun map-caller-code-components (function spaces fn)
579 "Call FN for each code component with a fdefn for FUNCTION in its
581 (let ((function (coerce function 'function)))
582 (map-allocated-code-components
585 (declare (ignore size))
589 (when (and (sb-kernel:fdefn-p constant)
590 (eq (sb-kernel:fdefn-fun constant)
592 (funcall fn obj))))))))
596 (defun get-simple-fun (functoid)
599 (get-simple-fun (sb-vm::fdefn-fun functoid)))
600 ((or null sb-impl::funcallable-instance)
603 (sb-kernel::%fun-fun functoid))))
605 (defun collect-xref (kind-index wanted-name)
607 (dolist (env sb-c::*info-environment* ret)
608 ;; Loop through the infodb ...
609 (sb-c::do-info (env :class class :type type :name info-name
611 ;; ... looking for function or macro definitions
612 (when (and (eql class :function)
613 (or (eql type :macro-function)
614 (eql type :definition)))
615 ;; Get a simple-fun for the definition, and an xref array
616 ;; from the table if available.
617 (let* ((simple-fun (get-simple-fun value))
618 (xrefs (when simple-fun
619 (sb-kernel:%simple-fun-xrefs simple-fun)))
621 (aref xrefs kind-index))))
622 ;; Loop through the name/path xref entries in the table
623 (loop for i from 0 below (length array) by 2
624 for xref-name = (aref array i)
625 for xref-path = (aref array (1+ i))
626 do (when (eql xref-name wanted-name)
627 (let ((source-location
628 (find-function-definition-source simple-fun)))
629 ;; Use the more accurate source path from
631 (setf (definition-source-form-path source-location)
633 (push (cons info-name source-location)
636 (defun who-calls (function-name)
637 "Use the xref facility to search for source locations where the
638 global function named FUNCTION-NAME is called. Returns a list of
639 function name, definition-source pairs."
640 (collect-xref #.(position :calls sb-c::*xref-kinds*) function-name))
642 (defun who-binds (symbol)
643 "Use the xref facility to search for source locations where the
644 special variable SYMBOL is rebound. Returns a list of function name,
645 definition-source pairs."
646 (collect-xref #.(position :binds sb-c::*xref-kinds*) symbol))
648 (defun who-references (symbol)
649 "Use the xref facility to search for source locations where the
650 special variable or constant SYMBOL is read. Returns a list of function
651 name, definition-source pairs."
652 (collect-xref #.(position :references sb-c::*xref-kinds*) symbol))
654 (defun who-sets (symbol)
655 "Use the xref facility to search for source locations where the
656 special variable SYMBOL is written to. Returns a list of function name,
657 definition-source pairs."
658 (collect-xref #.(position :sets sb-c::*xref-kinds*) symbol))
660 (defun who-macroexpands (macro-name)
661 "Use the xref facility to search for source locations where the
662 macro MACRO-NAME is expanded. Returns a list of function name,
663 definition-source pairs."
664 (collect-xref #.(position :macroexpands sb-c::*xref-kinds*) macro-name))
666 (defun who-specializes-directly (class-designator)
667 "Search for source locations of methods directly specializing on
668 CLASS-DESIGNATOR. Returns an alist of method name, definition-source
671 A method matches the criterion either if it specializes on the same
672 class as CLASS-DESIGNATOR designates (this includes CLASS-EQ
673 specializers), or if it eql-specializes on an instance of the
678 (let ((class (canonicalize-class-designator class-designator)))
680 (return-from who-specializes-directly nil))
681 (let ((result (collect-specializing-methods
683 ;; Does SPECL specialize on CLASS directly?
685 (sb-pcl::class-eq-specializer
686 (eq (sb-pcl::specializer-object specl) class))
687 (sb-pcl::eql-specializer
688 (let ((obj (sb-mop:eql-specializer-object specl)))
689 (eq (class-of obj) class)))
690 ((not sb-pcl::standard-specializer)
693 (eq specl class)))))))
694 (map-into result #'(lambda (m)
695 (cons `(method ,(method-generic-function-name m))
696 (find-definition-source m)))
699 (defun who-specializes-generally (class-designator)
700 "Search for source locations of methods specializing on
701 CLASS-DESIGNATOR, or a subclass of it. Returns an alist of method
702 name, definition-source pairs.
704 A method matches the criterion either if it specializes on the
705 designated class itself or a subclass of it (this includes CLASS-EQ
706 specializers), or if it eql-specializes on an instance of the
707 designated class or a subclass of it.
711 (let ((class (canonicalize-class-designator class-designator)))
713 (return-from who-specializes-generally nil))
714 (let ((result (collect-specializing-methods
716 ;; Does SPECL specialize on CLASS or a subclass
719 (sb-pcl::class-eq-specializer
720 (subtypep (sb-pcl::specializer-object specl) class))
721 (sb-pcl::eql-specializer
722 (typep (sb-mop:eql-specializer-object specl) class))
723 ((not sb-pcl::standard-specializer)
726 (subtypep specl class)))))))
727 (map-into result #'(lambda (m)
728 (cons `(method ,(method-generic-function-name m))
729 (find-definition-source m)))
732 (defun canonicalize-class-designator (class-designator)
733 (typecase class-designator
734 (symbol (find-class class-designator nil))
735 (class class-designator)
738 (defun method-generic-function-name (method)
739 (sb-mop:generic-function-name (sb-mop:method-generic-function method)))
741 (defun collect-specializing-methods (predicate)
743 (sb-pcl::map-specializers
745 (when (funcall predicate specl)
746 (let ((methods (sb-mop:specializer-direct-methods specl)))
747 (setf result (append methods result))))))
748 (delete-duplicates result)))
751 ;;;; ALLOCATION INTROSPECTION
753 (defun allocation-information (object)
755 "Returns information about the allocation of OBJECT. Primary return value
756 indicates the general type of allocation: :IMMEDIATE, :HEAP, :STACK,
759 Possible secondary return value provides additional information about the
762 For :HEAP objects the secondary value is a plist:
765 Inficates the heap segment the object is allocated in.
768 Is the current generation of the object: 0 for nursery, 6 for pseudo-static
769 generation loaded from core. (GENCGC and :SPACE :DYNAMIC only.)
772 Indicates a \"large\" object subject to non-copying
773 promotion. (GENCGC and :SPACE :DYNAMIC only.)
776 Indicates that the object is allocated in a boxed region. Unboxed
777 allocation is used for eg. specialized arrays after they have survived one
778 collection. (GENCGC and :SPACE :DYNAMIC only.)
781 Indicates that the page(s) on which the object resides are kept live due
782 to conservative references. Note that object may reside on a pinned page
783 even if :PINNED in NIL if the GC has not had the need to mark the the page
784 as pinned. (GENCGC and :SPACE :DYNAMIC only.)
787 Indicates that the page on which the object starts is write-protected,
788 which indicates for :BOXED objects that it hasn't been written to since
789 the last GC of its generation. (GENCGC and :SPACE :DYNAMIC only.)
792 The index of the page the object resides on. (GENGC and :SPACE :DYNAMIC
795 For :STACK objects secondary value is the thread on whose stack the object is
798 Expected use-cases include introspection to gain insight into allocation and
799 GC behaviour and restricting memoization to heap-allocated arguments.
801 Experimental: interface subject to change."
802 ;; FIXME: Would be nice to provide the size of the object as well, though
803 ;; maybe that should be a separate function, and something like MAP-PARTS
804 ;; for mapping over parts of arbitrary objects so users can get "deep sizes"
805 ;; as well if they want to.
807 ;; FIXME: For the memoization use-case possibly we should also provide a
808 ;; simpler HEAP-ALLOCATED-P, since that doesn't require disabling the GC
809 ;; scanning threads for negative answers? Similarly, STACK-ALLOCATED-P for
810 ;; checking if an object has been stack-allocated by a given thread for
811 ;; testing purposes might not come amiss.
812 (if (typep object '(or fixnum character))
813 (values :immediate nil)
815 (sb-sys:without-gcing
816 ;; Disable GC so the object cannot move to another page while
817 ;; we have the address.
818 (let* ((addr (sb-kernel:get-lisp-obj-address object))
820 (cond ((< sb-vm:read-only-space-start addr
821 (* sb-vm:*read-only-space-free-pointer*
824 ((< sb-vm:static-space-start addr
825 (* sb-vm:*static-space-free-pointer*
828 ((< (sb-kernel:current-dynamic-space-start) addr
829 (sb-sys:sap-int (sb-kernel:dynamic-space-free-pointer)))
833 (if (eq :dynamic space)
834 (let ((index (sb-vm::find-page-index addr)))
835 (symbol-macrolet ((page (sb-alien:deref sb-vm::page-table index)))
836 (let ((flags (sb-alien:slot page 'sb-vm::flags)))
838 :generation (sb-alien:slot page 'sb-vm::gen)
839 :write-protected (logbitp 0 flags)
840 :boxed (logbitp 2 flags)
841 :pinned (logbitp 5 flags)
842 :large (logbitp 6 flags)
846 (list :space space))))))
848 (values :heap plist))
850 (let ((sap (sb-sys:int-sap (sb-kernel:get-lisp-obj-address object))))
851 ;; FIXME: Check other stacks as well.
853 (dolist (thread (sb-thread:list-all-threads))
854 (let ((c-start (sb-di::descriptor-sap
855 (sb-thread::%symbol-value-in-thread
856 'sb-vm:*control-stack-start*
858 (c-end (sb-di::descriptor-sap
859 (sb-thread::%symbol-value-in-thread
860 'sb-vm:*control-stack-end*
862 (when (and c-start c-end)
863 (when (and (sb-sys:sap<= c-start sap)
864 (sb-sys:sap< sap c-end))
865 (return-from allocation-information
866 (values :stack thread))))))
868 (when (sb-vm:control-stack-pointer-valid-p sap nil)
869 (return-from allocation-information
870 (values :stack sb-thread::*current-thread*))))
873 (defun map-root (function object &key simple (ext t))
874 "Call FUNCTION with all non-immediate objects pointed to by OBJECT.
877 If SIMPLE is true (default is NIL), elides those pointers that are not
878 notionally part of certain built-in objects, but backpointers to a
879 conceptual parent: eg. elides the pointer from a SYMBOL to the
880 corresponding PACKAGE.
882 If EXT is true (default is T), includes some pointers that are not
883 actually contained in the object, but found in certain well-known
884 indirect containers: FDEFINITIONs, EQL specializers, classes, and
885 thread-local symbol values in other threads fall into this category.
887 NOTE: calling MAP-ROOT with a THREAD does not currently map over
888 conservative roots from the thread registers and interrupt contexts.
890 Experimental: interface subject to change."
891 (let ((fun (coerce function 'function))
892 (seen (sb-int:alloc-xset)))
894 (when (and (member (sb-kernel:lowtag-of part)
895 `(,sb-vm:instance-pointer-lowtag
896 ,sb-vm:list-pointer-lowtag
897 ,sb-vm:fun-pointer-lowtag
898 ,sb-vm:other-pointer-lowtag))
899 (not (sb-int:xset-member-p part seen)))
900 (sb-int:add-to-xset part seen)
901 (funcall fun part))))
903 (let ((table sb-pcl::*eql-specializer-table*))
904 (call (sb-ext:with-locked-hash-table (table)
905 (gethash object table)))))
907 ((or bignum float sb-sys:system-area-pointer fixnum))
909 (call (sb-ext:weak-pointer-value object)))
913 (when (and ext (ignore-errors (fboundp object)))
914 (call (fdefinition object))))
916 (call (numerator object))
917 (call (denominator object)))
919 (call (realpart object))
920 (call (realpart object)))
922 (let* ((len (sb-kernel:%instance-length object))
923 (nuntagged (if (typep object 'structure-object)
924 (sb-kernel:layout-n-untagged-slots
925 (sb-kernel:%instance-layout object))
927 (dotimes (i (- len nuntagged))
928 (call (sb-kernel:%instance-ref object i))))
930 (when (typep object 'sb-thread:thread)
931 (cond ((eq object sb-thread:*current-thread*)
932 (dolist (value (sb-thread::%thread-local-references))
934 (sb-vm::map-stack-references #'call))
936 ;; KLUDGE: INTERRUPT-THREAD is Not Nice (tm), but
937 ;; the alternative would be stopping the world...
939 (let ((sem (sb-thread:make-semaphore))
943 (sb-thread:interrupt-thread
946 (setf refs (sb-thread::%thread-local-references))
947 (sb-vm::map-stack-references (lambda (x) (push x refs)))
948 (sb-thread:signal-semaphore sem)))
949 (sb-thread:wait-on-semaphore sem))
950 (sb-thread:interrupt-thread-error ()))
951 (mapc #'call refs))))))
953 (if (simple-vector-p object)
954 (dotimes (i (length object))
955 (call (aref object i)))
956 (when (sb-kernel:array-header-p object)
957 (call (sb-kernel::%array-data-vector object))
958 (call (sb-kernel::%array-displaced-p object))
960 (call (sb-kernel::%array-displaced-from object))))))
961 (sb-kernel:code-component
962 (call (sb-kernel:%code-entry-points object))
963 (call (sb-kernel:%code-debug-info object))
964 (loop for i from sb-vm:code-constants-offset
965 below (sb-kernel:get-header-data object)
966 do (call (sb-kernel:code-header-ref object i))))
968 (call (sb-kernel:fdefn-name object))
969 (call (sb-kernel:fdefn-fun object)))
970 (sb-kernel:simple-fun
972 (call (sb-kernel:%simple-fun-next object)))
973 (call (sb-kernel:fun-code-header object))
974 (call (sb-kernel:%simple-fun-name object))
975 (call (sb-kernel:%simple-fun-arglist object))
976 (call (sb-kernel:%simple-fun-type object))
977 (call (sb-kernel:%simple-fun-info object)))
979 (call (sb-kernel:%closure-fun object))
980 (sb-kernel:do-closure-values (x object)
982 (sb-kernel:funcallable-instance
983 (call (sb-kernel:%funcallable-instance-function object))
984 (loop for i from 1 below (- (1+ (sb-kernel:get-closure-length object))
985 sb-vm::funcallable-instance-info-offset)
986 do (call (sb-kernel:%funcallable-instance-info object i))))
989 (dolist (thread (sb-thread:list-all-threads))
990 (call (sb-thread:symbol-value-in-thread object thread nil))))
992 ;; We don't have GLOBAL-BOUNDP, and there's no ERRORP arg.
993 (call (sb-ext:symbol-global-value object))
994 (unbound-variable ()))
995 (when (and ext (ignore-errors (fboundp object)))
996 (call (fdefinition object))
997 (call (macro-function object))
998 (let ((class (find-class object nil)))
999 (when class (call class))))
1000 (call (symbol-plist object))
1001 (call (symbol-name object))
1003 (call (symbol-package object))))
1004 (sb-kernel::random-class
1005 (case (sb-kernel:widetag-of object)
1006 (#.sb-vm::value-cell-header-widetag
1007 (call (sb-kernel::value-cell-ref object)))
1008 #+(and sb-lutex sb-thread)
1009 (#.sb-vm::lutex-widetag)
1011 (warn "~&MAP-ROOT: Unknown widetag ~S: ~S~%"
1012 (sb-kernel:widetag-of object) object)))))))