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"
53 "WHO-SPECIALIZES-DIRECTLY"
54 "WHO-SPECIALIZES-GENERALLY"))
56 (in-package :sb-introspect)
58 ;;;; Internal interface for SBCL debug info
60 ;;; Here are some tutorial-style type definitions to help understand
61 ;;; the internal SBCL debugging data structures we're using. The
62 ;;; commentary is based on CMUCL's debug internals manual.
64 (deftype debug-info ()
65 "Structure containing all the debug information related to a function.
66 Function objects reference debug-infos which in turn reference
67 debug-sources and so on."
68 'sb-c::compiled-debug-info)
70 (deftype debug-source ()
71 "Debug sources describe where to find source code.
72 For example, the debug source for a function compiled from a file will
73 include the pathname of the file and the position of the definition."
76 (deftype debug-function ()
77 "Debug function represent static compile-time information about a function."
78 'sb-c::compiled-debug-fun)
80 (declaim (ftype (function (function) debug-info) function-debug-info))
81 (defun function-debug-info (function)
82 (let* ((function-object (sb-kernel::%fun-fun function))
83 (function-header (sb-kernel:fun-code-header function-object)))
84 (sb-kernel:%code-debug-info function-header)))
86 (declaim (ftype (function (function) debug-source) function-debug-source))
87 (defun function-debug-source (function)
88 (debug-info-source (function-debug-info function)))
90 (declaim (ftype (function (debug-info) debug-source) debug-info-source))
91 (defun debug-info-source (debug-info)
92 (sb-c::debug-info-source debug-info))
94 (declaim (ftype (function (debug-info) debug-function) debug-info-debug-function))
95 (defun debug-info-debug-function (debug-info)
96 (elt (sb-c::compiled-debug-info-fun-map debug-info) 0))
98 (defun valid-function-name-p (name)
99 "True if NAME denotes a valid function name, ie. one that can be passed to
101 (and (sb-int:valid-function-name-p name) t))
103 ;;;; Finding definitions
105 (defstruct definition-source
106 ;; Pathname of the source file that the definition was compiled from.
107 ;; This is null if the definition was not compiled from a file.
108 (pathname nil :type (or null pathname))
109 ;; Source-path of the definition within the file.
110 ;; This may be incomplete depending on the debug level at which the
111 ;; source was compiled.
112 (form-path '() :type list)
113 ;; Character offset of the top-level-form containing the definition.
114 ;; This corresponds to the first element of form-path.
115 (character-offset nil :type (or null integer))
116 ;; File-write-date of the source file when compiled.
117 ;; Null if not compiled from a file.
118 (file-write-date nil :type (or null integer))
119 ;; plist from WITH-COMPILATION-UNIT
121 ;; Any extra metadata that the caller might be interested in. For
122 ;; example the specializers of the method whose definition-source this
124 (description nil :type list))
126 (defun find-definition-sources-by-name (name type)
127 "Returns a list of DEFINITION-SOURCEs for the objects of type TYPE
128 defined with name NAME. NAME may be a symbol or a extended function
129 name. Type can currently be one of the following:
154 If an unsupported TYPE is requested, the function will return NIL.
162 (find-class name nil)))
163 (real-fdefinition (name)
164 ;; for getting the real function object, even if the
165 ;; function is being profiled
166 (let ((profile-info (gethash name sb-profile::*profiled-fun-name->info*)))
168 (sb-profile::profile-info-encapsulated-fun profile-info)
169 (fdefinition name)))))
173 (when (and (symbolp name)
174 (eq (sb-int:info :variable :kind name) :special))
175 (translate-source-location (sb-int:info :source-location type name))))
177 (when (and (symbolp name)
178 (eq (sb-int:info :variable :kind name) :constant))
179 (translate-source-location (sb-int:info :source-location type name))))
181 (when (and (symbolp name)
182 (eq (sb-int:info :variable :kind name) :macro))
183 (translate-source-location (sb-int:info :source-location type name))))
185 (when (and (symbolp name)
186 (macro-function name))
187 (find-definition-source (macro-function name))))
189 (when (compiler-macro-function name)
190 (find-definition-source (compiler-macro-function name))))
191 ((:function :generic-function)
192 (when (and (fboundp name)
193 (or (not (symbolp name))
194 (not (macro-function name))))
195 (let ((fun (real-fdefinition name)))
196 (when (eq (not (typep fun 'generic-function))
197 (not (eq type :generic-function)))
198 (find-definition-source fun)))))
200 ;; Source locations for types are saved separately when the expander
201 ;; is a closure without a good source-location.
202 (let ((loc (sb-int:info :type :source-location name)))
204 (translate-source-location loc)
205 (let ((expander-fun (sb-int:info :type :expander name)))
207 (find-definition-source expander-fun))))))
210 (let ((fun (real-fdefinition name)))
211 (when (typep fun 'generic-function)
212 (loop for method in (sb-mop::generic-function-methods
214 for source = (find-definition-source method)
215 when source collect source)))))
217 (when (and (consp name)
218 (eq (car name) 'setf))
219 (setf name (cadr name)))
220 (let ((expander (or (sb-int:info :setf :inverse name)
221 (sb-int:info :setf :expander name))))
223 (sb-introspect:find-definition-source (if (symbolp expander)
224 (symbol-function expander)
227 (let ((class (get-class name)))
229 (when (typep class 'sb-pcl::structure-class)
230 (find-definition-source class))
231 (when (sb-int:info :typed-structure :info name)
232 (translate-source-location
233 (sb-int:info :source-location :typed-structure name))))))
235 (let ((class (get-class name)))
237 (not (typep class 'sb-pcl::structure-class)))
238 (when (eq (not (typep class 'sb-pcl::condition-class))
239 (not (eq type :condition)))
240 (find-definition-source class)))))
241 ((:method-combination)
242 (let ((combination-fun
243 (find-method #'sb-mop:find-method-combination
245 (list (find-class 'generic-function)
249 (when combination-fun
250 (find-definition-source combination-fun))))
253 (let ((package (find-package name)))
255 (find-definition-source package)))))
256 ;; TRANSFORM and OPTIMIZER handling from swank-sbcl
259 (let ((fun-info (sb-int:info :function :info name)))
261 (loop for xform in (sb-c::fun-info-transforms fun-info)
262 for source = (find-definition-source
263 (sb-c::transform-function xform))
264 for typespec = (sb-kernel:type-specifier
265 (sb-c::transform-type xform))
266 for note = (sb-c::transform-note xform)
267 do (setf (definition-source-description source)
269 (list (second typespec) note)
274 (let ((fun-info (sb-int:info :function :info name)))
276 (let ((otypes '((sb-c::fun-info-derive-type . sb-c:derive-type)
277 (sb-c::fun-info-ltn-annotate . sb-c:ltn-annotate)
278 (sb-c::fun-info-ltn-annotate . sb-c:ltn-annotate)
279 (sb-c::fun-info-optimizer . sb-c:optimizer))))
280 (loop for (reader . name) in otypes
281 for fn = (funcall reader fun-info)
283 (let ((source (find-definition-source fn)))
284 (setf (definition-source-description source)
289 (let ((fun-info (sb-int:info :function :info name)))
291 (loop for vop in (sb-c::fun-info-templates fun-info)
292 for source = (find-definition-source
293 (sb-c::vop-info-generator-function vop))
294 do (setf (definition-source-description source)
295 (list (sb-c::template-name vop)
296 (sb-c::template-note vop)))
300 (let ((transform-fun (sb-int:info :function :source-transform name)))
302 (sb-introspect:find-definition-source transform-fun)))))
306 (defun find-definition-source (object)
308 ((or sb-pcl::condition-class sb-pcl::structure-class)
309 (let ((classoid (sb-impl::find-classoid (class-name object))))
311 (let ((layout (sb-impl::classoid-layout classoid)))
313 (translate-source-location
314 (sb-kernel::layout-source-location layout)))))))
317 (find-definition-sources-by-name
318 (sb-pcl::method-combination-type-name object) :method-combination)))
320 (translate-source-location (sb-impl::package-source-location object)))
322 (translate-source-location (sb-pcl::definition-source object)))
323 ;; Use the PCL definition location information instead of the function
324 ;; debug-info for methods and generic functions. Sometimes the
325 ;; debug-info would point into PCL internals instead of the proper
328 (let ((source (translate-source-location
329 (sb-pcl::definition-source object))))
331 (setf (definition-source-description source)
332 (list (sb-mop:generic-function-lambda-list object))))
335 (let ((source (translate-source-location
336 (sb-pcl::definition-source object))))
338 (setf (definition-source-description source)
339 (append (method-qualifiers object)
340 (if (sb-mop:method-generic-function object)
341 (sb-pcl::unparse-specializers
342 (sb-mop:method-generic-function object)
343 (sb-mop:method-specializers object))
344 (sb-mop:method-specializers object)))))
347 (sb-eval:interpreted-function
348 (let ((source (translate-source-location
349 (sb-eval:interpreted-function-source-location object))))
352 (cond ((struct-accessor-p object)
353 (find-definition-source
354 (struct-accessor-structure-class object)))
355 ((struct-predicate-p object)
356 (find-definition-source
357 (struct-predicate-structure-class object)))
359 (find-function-definition-source object))))
360 ((or condition standard-object structure-object)
361 (find-definition-source (class-of object)))
363 (error "Don't know how to retrieve source location for a ~S"
366 (defun find-function-definition-source (function)
367 (let* ((debug-info (function-debug-info function))
368 (debug-source (debug-info-source debug-info))
369 (debug-fun (debug-info-debug-function debug-info))
370 (tlf (if debug-fun (sb-c::compiled-debug-fun-tlf-number debug-fun))))
371 (make-definition-source
373 ;; KLUDGE: at the moment, we don't record the correct toplevel
374 ;; form number for forms processed by EVAL (including EVAL-WHEN
375 ;; :COMPILE-TOPLEVEL). Until that's fixed, don't return a
376 ;; DEFINITION-SOURCE with a pathname. (When that's fixed, take
377 ;; out the (not (debug-source-form ...)) test.
378 (if (and (sb-c::debug-source-namestring debug-source)
379 (not (sb-c::debug-source-form 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*))))