1 ;;;; structures used for recording debugger information
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.
16 ;;;; We represent the place where some value is stored with a SC-OFFSET,
17 ;;;; which is the SC number and offset encoded as an integer.
19 (defconstant sc-offset-scn-byte (byte 5 0))
20 (defconstant sc-offset-offset-byte (byte 22 5))
21 (def!type sc-offset () '(unsigned-byte 27))
23 (defmacro make-sc-offset (scn offset)
24 `(dpb ,scn sc-offset-scn-byte
25 (dpb ,offset sc-offset-offset-byte 0)))
27 (defmacro sc-offset-scn (sco) `(ldb sc-offset-scn-byte ,sco))
28 (defmacro sc-offset-offset (sco) `(ldb sc-offset-offset-byte ,sco))
30 ;;;; flags for compiled debug variables
32 ;;; FIXME: old CMU CL representation follows:
33 ;;; Compiled debug variables are in a packed binary representation in the
34 ;;; DEBUG-FUNCTION-VARIABLES:
35 ;;; single byte of boolean flags:
39 ;;; has distinct save location
40 ;;; has ID (name not unique in this fun)
41 ;;; minimal debug-info argument (name generated as ARG-0, ...)
42 ;;; deleted: placeholder for unused minimal argument
43 ;;; [name length in bytes (as var-length integer), if not minimal]
44 ;;; [...name bytes..., if not minimal]
45 ;;; [if packaged, var-length integer that is package name length]
46 ;;; ...package name bytes...]
47 ;;; [If has ID, ID as var-length integer]
48 ;;; SC-Offset of primary location (as var-length integer)
49 ;;; [If has save SC, SC-Offset of save location (as var-length integer)]
51 ;;; FIXME: The first two are no longer used in SBCL.
52 ;;;(defconstant compiled-debug-var-uninterned #b00000001)
53 ;;;(defconstant compiled-debug-var-packaged #b00000010)
54 (defconstant compiled-debug-var-environment-live #b00000100)
55 (defconstant compiled-debug-var-save-loc-p #b00001000)
56 (defconstant compiled-debug-var-id-p #b00010000)
57 (defconstant compiled-debug-var-minimal-p #b00100000)
58 (defconstant compiled-debug-var-deleted-p #b01000000)
60 ;;;; compiled debug blocks
62 ;;;; Compiled debug blocks are in a packed binary representation in the
63 ;;;; DEBUG-FUNCTION-BLOCKS:
64 ;;;; number of successors + bit flags (single byte)
66 ;;;; ...ordinal number of each successor in the function's blocks vector...
67 ;;;; number of locations in this block
68 ;;;; kind of first location (single byte)
69 ;;;; delta from previous PC (or from 0 if first location in function.)
70 ;;;; [offset of first top-level form, if no function TLF-NUMBER]
71 ;;;; form number of first source form
72 ;;;; first live mask (length in bytes determined by number of VARIABLES)
73 ;;;; ...more <kind, delta, top-level form offset, form-number, live-set>
76 (defconstant compiled-debug-block-nsucc-byte (byte 2 0))
77 (defconstant compiled-debug-block-elsewhere-p #b00000100)
79 (defconstant compiled-code-location-kind-byte (byte 3 0))
80 (defconstant compiled-code-location-kinds
81 '#(:unknown-return :known-return :internal-error :non-local-exit
82 :block-start :call-site :single-value-return :non-local-entry))
84 ;;;; DEBUG-FUNCTION objects
86 (def!struct (debug-function (:constructor nil)))
88 (def!struct (compiled-debug-function (:include debug-function)
89 #-sb-xc-host (:pure t))
90 ;; The name of this function. If from a DEFUN, etc., then this is the
91 ;; function name, otherwise it is a descriptive string.
92 (name (required-argument) :type (or simple-string cons symbol))
93 ;; The kind of function (same as FUNCTIONAL-KIND):
94 (kind nil :type (member nil :optional :external :top-level :cleanup))
95 ;; a description of variable locations for this function, in alphabetical
96 ;; order by name; or NIL if no information is available
98 ;; The variable entries are alphabetically ordered. This ordering is used in
99 ;; lifetime info to refer to variables: the first entry is 0, the second
100 ;; entry is 1, etc. Variable numbers are *not* the byte index at which the
101 ;; representation of the location starts.
104 ;; * a FLAGS value, which is a FIXNUM with various
105 ;; COMPILED-DEBUG-FUNCTION-FOO bits set
106 ;; * the symbol which names this variable, unless debug info is minimal
107 ;; * the variable ID, when it has one
108 ;; * SC-offset of primary location, if it has one
109 ;; * SC-offset of save location, if it has one
110 (variables nil :type (or simple-vector null))
111 ;; A vector of the packed binary representation of the COMPILED-DEBUG-BLOCKs
112 ;; in this function, in the order that the blocks were emitted. The first
113 ;; block is the start of the function. This slot may be NIL to save space.
115 ;; FIXME: The "packed binary representation" description in the comment
116 ;; above is the same as the description of the old representation of
117 ;; VARIABLES which doesn't work properly in SBCL (because it doesn't
118 ;; transform correctly under package renaming). Check whether this slot's
119 ;; data might have the same problem that that slot's data did.
120 (blocks nil :type (or (simple-array (unsigned-byte 8) (*)) null))
121 ;; If all code locations in this function are in the same top-level form,
122 ;; then this is the number of that form, otherwise NIL. If NIL, then each
123 ;; code location represented in the BLOCKS specifies the TLF number.
124 (tlf-number nil :type (or index null))
125 ;; A vector describing the variables that the argument values are stored in
126 ;; within this function. The locations are represented by the ordinal number
127 ;; of the entry in the VARIABLES slot value. The locations are in the order
128 ;; that the arguments are actually passed in, but special marker symbols can
129 ;; be interspersed to indicate the original call syntax:
132 ;; There was an argument to the function in this position, but it was
133 ;; deleted due to lack of references. The value cannot be recovered.
136 ;; The following location is the supplied-p value for the preceding
137 ;; keyword or optional.
140 ;; Indicates that following unqualified args are optionals, not required.
143 ;; The following location holds the list of rest args.
146 ;; The following two locations are the more arg context and count.
148 ;; <any other symbol>
149 ;; The following location is the value of the keyword argument with the
152 ;; This may be NIL to save space. If no symbols are present, then this will
153 ;; be represented with an I-vector with sufficiently large element type. If
154 ;; this is :MINIMAL, then this means that the VARIABLES are all required
155 ;; arguments, and are in the order they appear in the VARIABLES vector. In
156 ;; other words, :MINIMAL stands in for a vector where every element holds its
158 (arguments nil :type (or (simple-array * (*)) (member :minimal nil)))
159 ;; There are three alternatives for this slot:
162 ;; A vector of SC-OFFSETS describing the return locations. The
163 ;; vector element type is chosen to hold the largest element.
166 ;; The function returns using the standard unknown-values convention.
169 ;; The function returns using the fixed-values convention, but
170 ;; in order to save space, we elected not to store a vector.
171 (returns :fixed :type (or (simple-array * (*)) (member :standard :fixed)))
172 ;; SC-Offsets describing where the return PC and return FP are kept.
173 (return-pc (required-argument) :type sc-offset)
174 (old-fp (required-argument) :type sc-offset)
175 ;; SC-Offset for the number stack FP in this function, or NIL if no NFP
177 (nfp nil :type (or sc-offset null))
178 ;; The earliest PC in this function at which the environment is properly
179 ;; initialized (arguments moved from passing locations, etc.)
180 (start-pc (required-argument) :type index)
181 ;; The start of elsewhere code for this function (if any.)
182 (elsewhere-pc (required-argument) :type index))
184 ;;;; minimal debug function
186 ;;; The minimal debug info format compactly represents debug-info for some
187 ;;; cases where the other debug info (variables, blocks) is small enough so
188 ;;; that the per-function overhead becomes relatively large. The minimal
189 ;;; debug-info format can represent any function at level 0, and any fixed-arg
190 ;;; function at level 1.
192 ;;; In the minimal format, the debug functions and function map are packed into
193 ;;; a single byte-vector which is placed in the
194 ;;; COMPILED-DEBUG-INFO-FUNCTION-MAP. Because of this, all functions in a
195 ;;; component must be representable in minimal format for any function to
196 ;;; actually be dumped in minimal format. The vector is a sequence of records
198 ;;; name representation + kind + return convention (single byte)
199 ;;; bit flags (single byte)
200 ;;; setf, nfp, variables
201 ;;; [package name length (as var-length int), if name is packaged]
202 ;;; [...package name bytes, if name is packaged]
203 ;;; [name length (as var-length int), if there is a name]
204 ;;; [...name bytes, if there is a name]
205 ;;; [variables length (as var-length int), if variables flag]
206 ;;; [...bytes holding variable descriptions]
207 ;;; If variables are dumped (level 1), then the variables are all
208 ;;; arguments (in order) with the minimal-arg bit set.
209 ;;; [If returns is specified, then the number of return values]
210 ;;; [...sequence of var-length ints holding sc-offsets of the return
211 ;;; value locations, if fixed return values are specified.]
212 ;;; return-pc location sc-offset (as var-length int)
213 ;;; old-fp location sc-offset (as var-length int)
214 ;;; [nfp location sc-offset (as var-length int), if nfp flag]
215 ;;; code-start-pc (as a var-length int)
216 ;;; This field implicitly encodes start of this function's code in the
217 ;;; function map, as a delta from the previous function's code start.
218 ;;; If the first function in the component, then this is the delta from
219 ;;; 0 (i.e. the absolute offset.)
220 ;;; start-pc (as a var-length int)
221 ;;; This encodes the environment start PC as an offset from the
224 ;;; This encodes the elsewhere code start for this function, as a delta
225 ;;; from the previous function's elsewhere code start. (i.e. the
226 ;;; encoding is the same as for code-start-pc.)
229 ### For functions with XEPs, name could be represented more simply and
230 compactly as some sort of info about with how to find the function-entry that
231 this is a function for. Actually, you really hardly need any info. You can
232 just chain through the functions in the component until you find the right one.
233 Well, I guess you need to at least know which function is an XEP for the real
234 function (which would be useful info anyway).
237 ;;; Following are definitions of bit-fields in the first byte of the minimal
239 (defconstant minimal-debug-function-name-symbol 0)
240 (defconstant minimal-debug-function-name-packaged 1)
241 (defconstant minimal-debug-function-name-uninterned 2)
242 (defconstant minimal-debug-function-name-component 3)
243 (defconstant minimal-debug-function-name-style-byte (byte 2 0))
244 (defconstant minimal-debug-function-kind-byte (byte 3 2))
245 (defconstant minimal-debug-function-kinds
246 '#(nil :optional :external :top-level :cleanup))
247 (defconstant minimal-debug-function-returns-standard 0)
248 (defconstant minimal-debug-function-returns-specified 1)
249 (defconstant minimal-debug-function-returns-fixed 2)
250 (defconstant minimal-debug-function-returns-byte (byte 2 5))
252 ;;; The following are bit-flags in the second byte of the minimal debug
255 ;;; If true, wrap (SETF ...) around the name.
256 (defconstant minimal-debug-function-setf-bit (ash 1 0))
258 ;;; If true, there is a NFP.
259 (defconstant minimal-debug-function-nfp-bit (ash 1 1))
261 ;;; If true, variables (hence arguments) have been dumped.
262 (defconstant minimal-debug-function-variables-bit (ash 1 2))
266 (def!struct (debug-source #-sb-xc-host (:pure t))
267 ;; This slot indicates where the definition came from:
268 ;; :File - from a file (Compile-File)
269 ;; :Lisp - from Lisp (Compile)
270 (from (required-argument) :type (member :file :lisp))
271 ;; If :File, the file name, if :Lisp or :Stream, then a vector of the
272 ;; top-level forms. When from COMPILE, form 0 is #'(LAMBDA ...).
274 ;; File comment for this file, if any.
275 (comment nil :type (or simple-string null))
276 ;; The universal time that the source was written, or NIL if unavailable.
277 (created nil :type (or unsigned-byte null))
278 ;; The universal time that the source was compiled.
279 (compiled (required-argument) :type unsigned-byte)
280 ;; The source path root number of the first form read from this source (i.e.
281 ;; the total number of forms converted previously in this compilation.)
282 (source-root 0 :type index)
283 ;; The file-positions of each truly top-level form read from this file (if
284 ;; applicable). The vector element type will be chosen to hold the largest
285 ;; element. May be null to save space.
286 (start-positions nil :type (or (simple-array * (*)) null))
287 ;; If from :LISP, this is the function whose source is form 0.
290 ;;;; DEBUG-INFO structures
292 (def!struct debug-info
293 ;; Some string describing something about the code in this component.
294 (name (required-argument) :type simple-string)
295 ;; A list of DEBUG-SOURCE structures describing where the code for this
296 ;; component came from, in the order that they were read.
298 ;; *** NOTE: the offset of this slot is wired into the fasl dumper so that it
299 ;; *** can backpatch the source info when compilation is complete.
300 (source nil :type list))
302 (def!struct (compiled-debug-info
303 (:include debug-info)
304 #-sb-xc-host (:pure t))
305 ;; a simple-vector of alternating DEBUG-FUNCTION objects and fixnum PCs,
306 ;; used to map PCs to functions, so that we can figure out what function we
307 ;; were running in. Each function is valid between the PC before it
308 ;; (inclusive) and the PC after it (exclusive). The PCs are in sorted order,
309 ;; to allow binary search. We omit the first and last PC, since their values
310 ;; are 0 and the length of the code vector.
312 ;; KLUDGE: PC's can't always be represented by FIXNUMs, unless we're always
313 ;; careful to put our code in low memory. Is that how it works? Would this
314 ;; break if we used a more general memory map? -- WHN 20000120
315 (function-map (required-argument) :type simple-vector :read-only t))