1 ;;; introspection library
3 ;;; This is here as a discussion point, not yet a supported interface. If
4 ;;; you would like to use the functions here, or you would like other
5 ;;; functions to be here, join the debate on navel@metacircles.com.
6 ;;; List info at http://lists.metacircles.com/cgi-bin/mailman/listinfo/navel
8 ;;; For the avoidance of doubt, the exported interface is the proposed
9 ;;; supported interface. Anything else is internal, though you're
10 ;;; welcome to argue a case for exporting it.
12 ;;; If you steal the code from this file to cut and paste into your
13 ;;; own project, there will be much wailing and gnashing of teeth.
14 ;;; Your teeth. If need be, we'll kick them for you. This is a
15 ;;; contrib, we're allowed to look in internals. You're an
16 ;;; application programmer, and are not.
19 ;;; 1) structs don't have within-file location info. problem for the
20 ;;; structure itself, accessors and the predicate
21 ;;; 2) what should find-definition-source on a symbol return? there may be
22 ;;; several definitions (class, function, etc)
23 ;;; 3) error handling. Signal random errors, or handle and resignal 'our'
24 ;;; error, or return NIL?
26 ;;; 5) would be nice to have some interface to the compiler that lets us
27 ;;; fake the filename and position, for use with C-M-x
29 (defpackage :sb-introspect
31 (:export "FUNCTION-ARGLIST" "VALID-FUNCTION-NAME-P"
32 "FIND-DEFINITION-SOURCE"
33 "DEFINITION-SOURCE" "DEFINITION-SOURCE-PATHNAME"
34 "DEFINITION-NOT-FOUND" "DEFINITION-NAME"
35 "DEFINITION-SOURCE-FORM-PATH"
36 "DEFINITION-SOURCE-CHARACTER-OFFSET"
37 "DEFINITION-SOURCE-FILE-WRITE-DATE"
38 "FIND-FUNCTION-CALLEES"
39 "FIND-FUNCTION-CALLERS"
41 (in-package :sb-introspect)
43 ;;;; Internal interface for SBCL debug info
45 ;;; Here are some tutorial-style type definitions to help understand
46 ;;; the internal SBCL debugging data structures we're using. The
47 ;;; commentary is based on CMUCL's debug internals manual.
49 (deftype debug-info ()
50 "Structure containing all the debug information related to a function.
51 Function objects reference debug-infos which in turn reference
52 debug-sources and so on."
53 'sb-c::compiled-debug-info)
55 (deftype debug-source ()
56 "Debug sources describe where to find source code.
57 For example, the debug source for a function compiled from a file will
58 include the pathname of the file and the position of the definition."
61 (deftype debug-function ()
62 "Debug function represent static compile-time information about a function."
63 'sb-c::compiled-debug-fun)
65 (declaim (ftype (function (function) debug-info) function-debug-info))
66 (defun function-debug-info (function)
67 (let* ((function-object (sb-kernel::%closure-fun function))
68 (function-header (sb-kernel:fun-code-header function-object)))
69 (sb-kernel:%code-debug-info function-header)))
71 (declaim (ftype (function (function) debug-source) function-debug-source))
72 (defun function-debug-source (function)
73 (debug-info-source (function-debug-info function)))
75 (declaim (ftype (function (debug-info) debug-source) debug-info-source))
76 (defun debug-info-source (debug-info)
77 (destructuring-bind (debug-source &rest other-debug-sources)
78 (sb-c::compiled-debug-info-source debug-info)
79 ;; COMPILED-DEBUG-INFO-SOURCES can return a list but we expect
80 ;; this to always contain exactly one element in SBCL. The list
81 ;; interface is inherited from CMUCL. -luke (12/Mar/2005)
82 (assert (null other-debug-sources))
85 (declaim (ftype (function (debug-info) debug-function) debug-info-debug-function))
86 (defun debug-info-debug-function (debug-info)
87 (elt (sb-c::compiled-debug-info-fun-map debug-info) 0))
89 (defun valid-function-name-p (name)
90 "True if NAME denotes a function name that can be passed to MACRO-FUNCTION or FDEFINITION "
91 (and (sb-int:valid-function-name-p name) t))
93 ;;;; Finding definitions
95 (defstruct definition-source
96 ;; Pathname of the source file that the definition was compiled from.
97 ;; This is null if the definition was not compiled from a file.
98 (pathname nil :type (or null pathname))
99 ;; Source-path of the definition within the file.
100 ;; This may be incomplete depending on the debug level at which the
101 ;; source was compiled.
102 (form-path '() :type list)
103 ;; Character offset of the top-level-form containing the definition.
104 ;; This corresponds to the first element of form-path.
105 (character-offset nil :type (or null integer))
106 ;; File-write-date of the source file when compiled.
107 ;; Null if not compiled from a file.
108 (file-write-date nil :type (or null integer)))
110 (defun find-definition-source (object)
113 (find-definition-source (or (sb-pcl::method-fast-function object)
114 (sb-pcl:method-function object))))
116 (cond ((struct-accessor-p object)
117 (find-definition-source (struct-accessor-structure-class object)))
118 ((struct-predicate-p object)
119 (find-definition-source (struct-predicate-structure-class object)))
120 (t (find-function-definition-source object))))
123 (sb-kernel::structure-classoid-constructor
124 (sb-kernel:classoid-cell-classoid
125 (sb-int:info :type :classoid (class-name object))))))
126 (find-definition-source constructor)))
128 (if (valid-function-name-p object)
129 (find-definition-source (or (macro-function object)
130 (fdefinition object)))))))
132 (defun find-function-definition-source (function)
133 (let* ((debug-info (function-debug-info function))
134 (debug-source (debug-info-source debug-info))
135 (debug-fun (debug-info-debug-function debug-info))
136 (tlf (if debug-fun (sb-c::compiled-debug-fun-tlf-number debug-fun))))
137 (make-definition-source
139 (if (eql (sb-c::debug-source-from debug-source) :file)
140 (parse-namestring (sb-c::debug-source-name debug-source)))
143 (elt (sb-c::debug-source-start-positions debug-source) tlf))
144 ;; Unfortunately there is no proper source path available in the
145 ;; debug-source. FIXME: We could use sb-di:code-locations to get
146 ;; a full source path. -luke (12/Mar/2005)
147 :form-path (if tlf (list tlf))
148 :file-write-date (sb-c::debug-source-created debug-source))))
150 ;;; This is kludgey. We expect these functions (the underlying functions,
151 ;;; not the closures) to be in static space and so not move ever.
152 ;;; FIXME It's also possibly wrong: not all structures use these vanilla
153 ;;; accessors, e.g. when the :type option is used
154 (defvar *struct-slotplace-reader*
155 (sb-vm::%simple-fun-self #'definition-source-pathname))
156 (defvar *struct-slotplace-writer*
157 (sb-vm::%simple-fun-self #'(setf definition-source-pathname)))
158 (defvar *struct-predicate*
159 (sb-vm::%simple-fun-self #'definition-source-p))
161 (defun struct-accessor-p (function)
162 (let ((self (sb-vm::%simple-fun-self function)))
163 ;; FIXME there are other kinds of struct accessor. Fill out this list
164 (member self (list *struct-slotplace-reader*
165 *struct-slotplace-writer*))))
167 (defun struct-predicate-p (function)
168 (let ((self (sb-vm::%simple-fun-self function)))
169 ;; FIXME there may be other structure predicate functions
170 (member self (list *struct-predicate*))))
172 ;;; FIXME: maybe this should be renamed as FUNCTION-LAMBDA-LIST?
173 (defun function-arglist (function)
174 "Describe the lambda list for the function designator FUNCTION.
175 Works for special-operators, macros, simple functions and generic
176 functions. Signals error if not found"
177 (cond ((valid-function-name-p function)
179 (or (macro-function function) (fdefinition function))))
180 ((typep function 'generic-function)
181 (sb-pcl::generic-function-pretty-arglist function))
182 (t (sb-impl::%simple-fun-arglist
183 (sb-impl::%closure-fun function)))))
185 (defun struct-accessor-structure-class (function)
186 (let ((self (sb-vm::%simple-fun-self function)))
188 ((member self (list *struct-slotplace-reader* *struct-slotplace-writer*))
190 (sb-kernel::classoid-name
191 (sb-kernel::layout-classoid
192 (sb-kernel:%closure-index-ref function 1)))))
195 (defun struct-predicate-structure-class (function)
196 (let ((self (sb-vm::%simple-fun-self function)))
198 ((member self (list *struct-predicate*))
200 (sb-kernel::classoid-name
201 (sb-kernel::layout-classoid
202 (sb-kernel:%closure-index-ref function 0)))))
205 ;;;; find callers/callees, liberated from Helmut Eller's code in SLIME
207 ;;; This interface is trmendously experimental.
209 ;;; For the moment I'm taking the view that FDEFN is an internal
210 ;;; object (one out of one CMUCL developer surveyed didn't know what
211 ;;; they were for), so these routines deal in FUNCTIONs
213 ;;; Find callers and callees by looking at the constant pool of
214 ;;; compiled code objects. We assume every fdefn object in the
215 ;;; constant pool corresponds to a call to that function. A better
216 ;;; strategy would be to use the disassembler to find actual
219 (defun find-function-callees (function)
220 "Return functions called by FUNCTION."
223 (sb-kernel:fun-code-header function)
225 (when (sb-kernel:fdefn-p obj)
226 (push (sb-kernel:fdefn-fun obj)
231 (defun find-function-callers (function &optional (spaces '(:read-only :static
233 "Return functions which call FUNCTION, by searching SPACES for code objects"
234 (let ((referrers '()))
235 (map-caller-code-components
239 (let ((entry (sb-kernel:%code-entry-points code)))
241 (push (princ-to-string code) referrers))
243 (loop for e = entry then (sb-kernel::%simple-fun-next e)
245 do (pushnew e referrers)))))))
248 (declaim (inline map-code-constants))
249 (defun map-code-constants (code fn)
250 "Call FN for each constant in CODE's constant pool."
251 (check-type code sb-kernel:code-component)
252 (loop for i from sb-vm:code-constants-offset below
253 (sb-kernel:get-header-data code)
254 do (funcall fn (sb-kernel:code-header-ref code i))))
256 (declaim (inline map-allocated-code-components))
257 (defun map-allocated-code-components (spaces fn)
258 "Call FN for each allocated code component in one of SPACES. FN
259 receives the object and its size as arguments. SPACES should be a
260 list of the symbols :dynamic, :static, or :read-only."
261 (dolist (space spaces)
262 (sb-vm::map-allocated-objects
263 (lambda (obj header size)
264 (when (= sb-vm:code-header-widetag header)
265 (funcall fn obj size)))
268 (declaim (inline map-caller-code-components))
269 (defun map-caller-code-components (function spaces fn)
270 "Call FN for each code component with a fdefn for FUNCTION in its
272 (let ((function (coerce function 'function)))
273 (map-allocated-code-components
276 (declare (ignore size))
280 (when (and (sb-kernel:fdefn-p constant)
281 (eq (sb-kernel:fdefn-fun constant)
283 (funcall fn obj))))))))
285 (provide 'sb-introspect)