| blob | 9a37fb2dda7dad817e7ef058304c666b2f5896bf |
1 ;;;; parts of the loader which make sense in the cross-compilation
2 ;;;; host (and which are useful in the host, because they're used by
3 ;;;; GENESIS)
4 ;;;;
5 ;;;; based on the CMU CL load.lisp code, written by Skef Wholey and
6 ;;;; Rob Maclachlan
8 ;;;; This software is part of the SBCL system. See the README file for
9 ;;;; more information.
10 ;;;;
11 ;;;; This software is derived from the CMU CL system, which was
12 ;;;; written at Carnegie Mellon University and released into the
13 ;;;; public domain. The software is in the public domain and is
14 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
15 ;;;; files for more information.
18 \f
19 ;;;; miscellaneous load utilities
21 ;;; Output the current number of semicolons after a fresh-line.
22 ;;; FIXME: non-mnemonic name
33 ;;; If VERBOSE, output (to *STANDARD-OUTPUT*) a message about how
34 ;;; we're loading from STREAM-WE-ARE-LOADING-FROM.
43 \f
44 ;;;; utilities for reading from fasl files
48 ;;; This expands into code to read an N-byte unsigned integer using
49 ;;; FAST-READ-BYTE.
58 ;;; like FAST-READ-U-INTEGER, but the size may be determined at run time
65 (,n-res
71 ;;; Read a signed integer.
77 ,n-last
84 ;;; Read an N-byte unsigned integer from the *FASL-INPUT-STREAM*
94 ;;; FIXME: This deserves a more descriptive name, and should probably
95 ;;; be implemented as an ordinary function, not a macro.
96 ;;;
97 ;;; (for the names: There seem to be only two cases, so it could be
98 ;;; named READ-U-INTEGER-8 and READ-U-INTEGER-32 or something.)
99 \f
100 ;;;; the fop table
102 ;;; The table is implemented as a simple-vector indexed by the table
103 ;;; offset. We may need to have several, since LOAD can be called
104 ;;; recursively.
106 ;;; a list of free fop tables for the fasloader
107 ;;;
108 ;;; FIXME: Is it really a win to have this permanently bound?
109 ;;; Couldn't we just bind it on entry to LOAD-AS-FASL?
112 ;;; the current fop table
116 ;;; the length of the current fop table
120 ;;; the index in the fop-table of the next entry to be used
140 \f
141 ;;;; the fop stack
143 ;;; (This is in a SIMPLE-VECTOR, but it grows down, since it is
144 ;;; somewhat cheaper to test for overflow that way.)
148 ;;; the index of the most recently pushed item on the fop stack
151 ;;; the current index into the fop stack when we last recursively
152 ;;; entered LOAD
166 ;;; Cache information about the fop stack in local variables. Define a
167 ;;; local macro to pop from the stack. Push the result of evaluation
168 ;;; if specified.
201 \f
202 ;;;; LOAD-AS-FASL
203 ;;;;
204 ;;;; Note: LOAD-AS-FASL is used not only by LOAD, but also (with
205 ;;;; suitable modification of the fop table) in GENESIS. Therefore,
206 ;;;; it's needed not only in the target Lisp, but also in the
207 ;;;; cross-compilation host.
209 ;;; a helper function for LOAD-FASL-GROUP
210 ;;;
211 ;;; Return true if we successfully read a FASL header from the stream,
212 ;;; or NIL if EOF was hit before anything was read. Signal an error if
213 ;;; we encounter garbage.
219 ;; Read the string part of the fasl header, or die.
227 t)
234 ;; Read and validate implementation and version, or die.
239 ;; FIXME: The logic above to read a keyword from the fasl file
240 ;; could probably be shared with the read-a-keyword fop.
247 but this version of SBCL uses ~
248 format version ~W.~:@>"
249 stream
250 variant
251 version
252 needed-version))
253 t)))
258 stream
259 implementation
262 ;; Setting this variable gives you a trace of fops as they are loaded and
263 ;; executed.
264 #!+sb-show
267 ;;; a helper function for LOAD-AS-FASL
268 ;;;
269 ;;; Return true if we successfully load a group from the stream, or
270 ;;; NIL if EOF was encountered while trying to read from the stream.
271 ;;; Dispatch to the right function for each fop. Special-case
272 ;;; FOP-BYTE-PUSH since it is real common.
280 ;; Do some debugging output.
281 #!+sb-show
286 ;; The FOP operations are stack based, so it's sorta
287 ;; logical to display the operand before the operator.
288 ;; ("reverse Polish notation")
293 ;; Display the operator.
295 "~&~S (#X~X at ~D) (~S)~%"
297 byte
301 ;; Actually execute the fop.
303 ;; FIXME: This is the special case for FOP-BYTE-PUSH.
304 ;; Benchmark to see whether it's really worth special
305 ;; casing it. If it is, at least express the test in
306 ;; terms of a symbolic name for the FOP-BYTE-PUSH code,
307 ;; not a bare '3' (!). Failing that, remove the special
308 ;; case (and the comment at the head of this function
309 ;; which mentions it).
322 ;; KLUDGE: ANSI says it's good to do something with the :PRINT
323 ;; argument to LOAD when we're fasloading a file, but currently we
324 ;; don't. (CMU CL did, but implemented it in a non-ANSI way, and I
325 ;; just disabled that instead of rewriting it.) -- WHN 20000131
335 ;; FIXME: This should probably become
336 ;; (LOOP WHILE (LOAD-FASL-GROUP-STREAM))
337 ;; but as a LOOP newbie I don't want to do that until I can
338 ;; test it.
343 ;; NIL out the stack and table, so that we don't hold onto garbage.
344 ;;
345 ;; FIXME: Couldn't we just get rid of the free fop table pool so
346 ;; that some of this NILing out would go away?
349 t)
351 ;;; This is used in in target-load and also genesis, using
352 ;;; *COLD-FOREIGN-SYMBOL-TABLE*. All the speculative prefix-adding
353 ;;; code for foreign symbol lookup should be here.
362 table
363 nil))
364 prefixes)))
366 \f
367 ;;;; stuff for debugging/tuning by collecting statistics on FOPs (?)
369 #|
377 t)
403 |#