2 ; Copyright (C) 2000, 2009 Red Hat, Inc.
3 ; This file is part of CGEN.
4 ; See file COPYING.CGEN for details.
6 ; FIXME: Later allow target to add new modes.
12 ; One of RANDOM, INT, UINT, FLOAT.
21 ; NON-MODE-C-TYPE is the C type to use in situations where
22 ; modes aren't available. A somewhat dubious feature, but at
23 ; the moment the opcodes tables use it. It is either the C
24 ; type as a string (e.g. "int") or #f for non-portable modes
25 ; (??? could use other typedefs for #f, e.g. int64 for DI).
26 ; Use of GCC can't be assumed though.
29 ; PRINTF-TYPE is the %<letter> arg to printf-like functions,
30 ; however we define our own extensions for non-portable modes.
31 ; Values not understood by printf aren't intended to be used
36 ; %D - DI mode (8 bytes)
37 ; %T - TI mode (16 bytes)
38 ; %O - OI mode (32 bytes)
43 ; SEM-MODE is the mode to use for semantic operations.
44 ; Unsigned modes are not part of the semantic language proper,
45 ; but they can be used in hardware descriptions. This maps
46 ; unusable -> usable modes. It is #f if the mode is usable by
47 ; itself. This prevents circular data structures and makes it
48 ; easy to define since the object doesn't exist before it's
50 ; ??? May wish to later remove SEM-MODE (e.g. mips signed add
51 ; is different than mips unsigned add). However for now it keeps
52 ; things simpler, and prevents being wildly dissimilar from
53 ; GCC-RTL. And the mips case needn't be handled with different
57 ; PTR-TO, if non-#f, is the mode being pointed to.
60 ; HOST? is non-#f if the mode is a portable int for hosts,
61 ; or other host-related value.
62 ; This is used for things like register numbers and small
63 ; odd-sized immediates and registers.
64 ; ??? Not my favorite word choice here, but it's close.
72 (define mode:class (elm-make-getter <mode> 'class))
73 (define mode:bits (elm-make-getter <mode> 'bits))
74 (define mode:bytes (elm-make-getter <mode> 'bytes))
75 (define mode:non-mode-c-type (elm-make-getter <mode> 'non-mode-c-type))
76 (define mode:printf-type (elm-make-getter <mode> 'printf-type))
77 (define mode:sem-mode (elm-make-getter <mode> 'sem-mode))
78 ; ptr-to is currently private so there is no accessor.
79 (define mode:host? (elm-make-getter <mode> 'host?))
81 ; Return string C type to use for values of mode M.
83 (define (mode:c-type m)
84 (let ((ptr-to (elm-xget m 'ptr-to)))
86 (string-append (mode:c-type ptr-to) " *")
90 ; CM is short for "concat mode". It is a list of modes of the elements
92 ; ??? Experiment. Not currently used.
95 (class-make '<concat-mode> '(<mode>)
97 ; List of element modes
105 (define cmode-elm-modes (elm-make-getter <concat-mode> 'elm-modes))
109 (define mode-list nil)
111 ; Return list of mode objects.
112 ; Hides the fact that its stored as an alist from caller.
114 (define (mode-list-values) (map cdr mode-list))
116 ; Return list of real mode objects (no aliases).
118 (define (mode-list-non-alias-values)
120 (find (lambda (m) (eq? (car m) (obj:name (cdr m))))
124 ; Return a boolean indicating if X is a <mode> object.
126 (define (mode? x) (class-instance? <mode> x))
128 ; Return enum cgen_mode_types value for M.
130 (define (mode:enum m)
131 (gen-c-symbol (string-append "MODE_" (string-upcase (obj:str-name m))))
134 ; Return a boolean indicating if MODE1 is equal to MODE2
135 ; Either may be the name of a mode or a <mode> object.
136 ; Aliases are handled by refering to their real name.
138 (define (mode:eq? mode1 mode2)
139 (let ((mode1-name (mode-real-name mode1))
140 (mode2-name (mode-real-name mode2)))
141 (eq? mode1-name mode2-name))
144 ; Return a boolean indicating if CLASS is one of INT/UINT.
146 (define (mode-class-integral? class) (memq class '(INT UINT)))
147 (define (mode-class-signed? class) (eq? class 'INT))
148 (define (mode-class-unsigned? class) (eq? class 'UINT))
150 ; Return a boolean indicating if CLASS is floating point.
152 (define (mode-class-float? class) (memq class '(FLOAT)))
154 ; Return a boolean indicating if CLASS is numeric.
156 (define (mode-class-numeric? class) (memq class '(INT UINT FLOAT)))
158 ; Return a boolean indicating if MODE has an integral mode class.
159 ; Similarily for signed/unsigned.
161 (define (mode-integral? mode) (mode-class-integral? (mode:class mode)))
162 (define (mode-signed? mode) (mode-class-signed? (mode:class mode)))
163 (define (mode-unsigned? mode) (mode-class-unsigned? (mode:class mode)))
165 ; Return a boolean indicating if MODE has a floating point mode class.
167 (define (mode-float? mode) (mode-class-float? (mode:class mode)))
169 ; Return a boolean indicating if MODE has a numeric mode class.
171 (define (mode-numeric? mode) (mode-class-numeric? (mode:class mode)))
173 ; Return a boolean indicating if MODE1 is compatible with MODE2.
174 ; MODE[12] are either names or <mode> objects.
175 ; HOW is a symbol indicating how the test is performed:
176 ; strict: modes must have same name
177 ; samesize: modes must be both float or both integer (int or uint) and have
179 ; sameclass: modes must be both float or both integer (int or uint)
180 ; numeric: modes must be both numeric
182 (define (mode-compatible? how mode1 mode2)
183 (let ((m1 (mode:lookup mode1))
184 (m2 (mode:lookup mode2)))
187 (eq? (obj:name m1) (obj:name m2)))
189 (cond ((mode-integral? m1)
190 (and (mode-integral? m2)
191 (= (mode:bits m1) (mode:bits m2))))
193 (and (mode-float? m2)
194 (= (mode:bits m1) (mode:bits m2))))
197 (cond ((mode-integral? m1) (mode-integral? m2))
198 ((mode-float? m1) (mode-float? m2))
201 (and (mode-numeric? m1) (mode-numeric? m2)))
202 (else (error "bad `how' arg to mode-compatible?" how))))
205 ; Add MODE named NAME to the list of recognized modes.
206 ; If NAME is already present, replace it with MODE.
207 ; MODE is a mode object.
208 ; NAME exists to allow aliases of modes [e.g. WI, UWI, AI, IAI].
210 ; No attempt to preserve any particular order of entries is done here.
211 ; That is up to the caller.
213 (define (mode:add! name mode)
214 (let ((entry (assq name mode-list)))
216 (set-cdr! entry mode)
217 (set! mode-list (acons name mode mode-list)))
222 ; This is the main routine for building a mode object.
223 ; All arguments are in raw (non-evaluated) form.
225 (define (/mode-parse context name comment attrs class bits bytes
226 non-mode-c-type printf-type sem-mode ptr-to host?)
227 (logit 2 "Processing mode " name " ...\n")
229 ;; Pick out name first to augment the error context.
230 (let* ((name (parse-name context name))
231 (context (context-append-name context name)))
235 (parse-comment context comment)
236 (atlist-parse context attrs "mode")
237 class bits bytes non-mode-c-type printf-type
238 sem-mode ptr-to host?))
241 ; ??? At present there is no define-mode that takes an associative list
244 ; Define a mode object, all arguments specified.
246 (define (define-full-mode name comment attrs class bits bytes
247 non-mode-c-type printf-type sem-mode ptr-to host?)
248 (let ((m (/mode-parse (make-current-context "define-full-mode")
251 non-mode-c-type printf-type sem-mode ptr-to host?)))
252 ; Add it to the list of insn modes.
257 ; Lookup the mode named X.
258 ; Return the found object or #f.
259 ; If X is already a mode object, return that.
261 (define (mode:lookup x)
264 (let ((result (assq x mode-list)))
270 ; Return a boolean indicating if X is a valid mode name.
272 (define (mode-name? x)
274 ; FIXME: Time to make `mode-list' a hash table.
275 (->bool (assq x mode-list)))
278 ; Return the name of the real mode of M.
279 ; This is a no-op unless M is an alias in which case we return the
280 ; real mode of the alias.
282 (define (mode-real-name m)
283 (obj:name (mode:lookup m))
286 ; Return the real mode of M.
287 ; This is a no-op unless M is an alias in which case we return the
288 ; real mode of the alias.
290 (define (mode-real-mode m)
291 (mode:lookup (mode-real-name m))
294 ; Return the version of MODE to use in semantic expressions.
295 ; This (essentially) converts aliases to their real value and then uses
296 ; mode:sem-mode. The implementation is the opposite but the effect is the
298 ; ??? Less efficient than it should be. One improvement would be to
299 ; disallow unsigned modes from being aliased and set sem-mode for aliased
302 (define (mode-sem-mode m)
303 (let* ((m1 (mode:lookup m))
304 (sm (mode:sem-mode m1)))
307 (mode-real-mode m1)))
310 ; Return #t if mode M1-NAME is bigger than mode M2-NAME.
312 (define (mode-bigger? m1-name m2-name)
313 (> (mode:bits (mode:lookup m1-name))
314 (mode:bits (mode:lookup m2-name)))
317 ; Return a mode in mode class CLASS wide enough to hold BITS.
318 ; This ignores "host" modes (e.g. INT,UINT).
320 (define (mode-find bits class)
321 (let ((modes (find (lambda (mode)
322 (and (eq? (mode:class (cdr mode)) class)
323 (not (mode:host? (cdr mode)))))
326 (error "invalid mode class" class))
327 (let loop ((modes modes))
328 (cond ((null? modes) (error "no modes for bits" bits))
329 ((<= bits (mode:bits (cdar modes))) (cdar modes))
330 (else (loop (cdr modes))))))
333 ; Parse MODE-NAME and return the mode object.
334 ; CONTEXT is a <context> object for error messages.
335 ; An error is signalled if MODE isn't valid.
337 (define (parse-mode-name context mode-name)
338 (let ((m (mode:lookup mode-name)))
340 (parse-error context "not a valid mode" mode-name))
344 ; Make a new INT/UINT mode.
345 ; These have a variable number of bits (1-64).
347 (define (mode-make-int bits)
348 (if (or (<= bits 0) (> bits 64))
349 (error "unsupported number of bits" bits))
350 (let ((result (object-copy-top INT)))
351 (elm-xset! result 'bits bits)
352 (elm-xset! result 'bytes (bits->bytes bits))
356 (define (mode-make-uint bits)
357 (if (or (<= bits 0) (> bits 64))
358 (error "unsupported number of bits" bits))
359 (let ((result (object-copy-top UINT)))
360 (elm-xset! result 'bits bits)
361 (elm-xset! result 'bytes (bits->bytes bits))
365 ; WI/UWI/AI/IAI modes
366 ; These are aliases for other modes, e.g. SI,DI.
367 ; Final values are defered until all cpu family definitions have been
368 ; read in so that we know the word size, etc.
370 ; NOTE: We currently assume WI/AI/IAI all have the same size: cpu:word-bitsize.
371 ; If we ever add an architecture that needs different modes for WI/AI/IAI,
372 ; we can add the support then.
374 ; This is defined by the target in define-cpu:word-bitsize.
378 ; An "address int". This is recorded in addition to a "word int" because it
379 ; is believed that some target will need it. It also stays consistent with
380 ; what BFD does. It also allows one to write rtl without having to care
381 ; what the real mode actually is.
382 ; ??? These are currently set from define-cpu:word-bitsize but that's just
383 ; laziness. If an architecture comes along that has different values,
384 ; add the support then.
388 ; Kind of word size handling wanted.
389 ; BIGGEST: pick the largest word size
390 ; IDENTICAL: all word sizes must be identical
391 (define /mode-word-sizes-kind #f)
393 ; Called when a cpu-family is read in to set the word sizes.
395 (define (mode-set-word-modes! bitsize)
396 (let ((current-word-bitsize (mode:bits WI))
397 (word-mode (mode-find bitsize 'INT))
398 (uword-mode (mode-find bitsize 'UINT))
401 ; Ensure we found a precise match.
402 (if (!= bitsize (mode:bits word-mode))
403 (error "unable to find precise mode to match cpu word-bitsize" bitsize))
405 ; Enforce word size kind.
406 (if (!= current-word-bitsize 0)
407 ; word size already set
408 (case /mode-word-sizes-kind
410 (if (!= current-word-bitsize (mode:bits word-mode))
411 (error "app requires all selected cpu families to have same word size"))
414 (if (>= current-word-bitsize (mode:bits word-mode))
421 (set! UWI uword-mode)
423 (set! IAI uword-mode)
424 (assq-set! mode-list 'WI word-mode)
425 (assq-set! mode-list 'UWI uword-mode)
426 (assq-set! mode-list 'AI uword-mode)
427 (assq-set! mode-list 'IAI uword-mode)
432 ; Called by apps to indicate cpu:word-bitsize always has one value.
433 ; It is an error to call this if the selected cpu families have
434 ; different word sizes.
435 ; Must be called before loading .cpu files.
437 (define (mode-set-identical-word-bitsizes!)
438 (set! /mode-word-sizes-kind 'IDENTICAL)
441 ; Called by apps to indicate using the biggest cpu:word-bitsize of all
442 ; selected cpu families.
443 ; Must be called before loading .cpu files.
445 (define (mode-set-biggest-word-bitsizes!)
446 (set! /mode-word-sizes-kind 'BIGGEST)
449 ; Ensure word sizes have been defined.
450 ; This must be called after all cpu families have been defined
451 ; and before any ifields, hardware, operand or insns have been read.
453 (define (mode-ensure-word-sizes-defined)
454 (if (eq? (mode-real-name WI) 'VOID)
455 (error "word sizes must be defined"))
460 ; Some modes are refered to by the Scheme code.
461 ; These have global bindings, but we try not to make this the general rule.
462 ; [Actually I don't think this is all that bad, but it seems reasonable to
463 ; not create global bindings that we don't have to.]
468 ; Variable sized portable ints.
473 (set! /mode-word-sizes-kind 'IDENTICAL)
475 (reader-add-command! 'define-full-mode
477 Define a mode, all arguments specified.
479 nil '(name commment attrs class bits bytes
480 non-c-mode-type printf-type sem-mode ptr-to host?)
486 ; Called before a . cpu file is read in to install any builtins.
488 (define (mode-builtin!)
489 ; FN-SUPPORT: In sem-ops.h file, include prototypes as well as macros.
490 ; Elsewhere, functions are defined to perform the operation.
491 (define-attr '(for mode) '(type boolean) '(name FN-SUPPORT))
495 (let ((dfm define-full-mode))
496 ; This list must be defined in order of increasing size among each type.
498 (dfm 'VOID "void" '() 'RANDOM 0 0 "void" "" #f #f #f) ; VOIDmode
500 ; Special marker to indicate "use the default mode".
501 ; ??? Not yet used everywhere it should be.
502 (dfm 'DFLT "default mode" '() 'RANDOM 0 0 "" "" #f #f #f)
504 ; Not UINT on purpose.
505 (dfm 'BI "one bit (0,1 not 0,-1)" '() 'INT 1 1 "int" "'x'" #f #f #f)
507 (dfm 'QI "8 bit byte" '() 'INT 8 1 "int" "'x'" #f #f #f)
508 (dfm 'HI "16 bit int" '() 'INT 16 2 "int" "'x'" #f #f #f)
509 (dfm 'SI "32 bit int" '() 'INT 32 4 "int" "'x'" #f #f #f)
510 (dfm 'DI "64 bit int" '(FN-SUPPORT) 'INT 64 8 "" "'D'" #f #f #f)
512 ; No unsigned versions on purpose for now.
513 (dfm 'TI "128 bit int" '(FN-SUPPORT) 'INT 128 16 "" "'T'" #f #f #f)
514 (dfm 'OI "256 bit int" '(FN-SUPPORT) 'INT 256 32 "" "'O'" #f #f #f)
516 (dfm 'UQI "8 bit unsigned byte" '() 'UINT
517 8 1 "unsigned int" "'x'" (mode:lookup 'QI) #f #f)
518 (dfm 'UHI "16 bit unsigned int" '() 'UINT
519 16 2 "unsigned int" "'x'" (mode:lookup 'HI) #f #f)
520 (dfm 'USI "32 bit unsigned int" '() 'UINT
521 32 4 "unsigned int" "'x'" (mode:lookup 'SI) #f #f)
522 (dfm 'UDI "64 bit unsigned int" '(FN-SUPPORT) 'UINT
523 64 8 "" "'D'" (mode:lookup 'DI) #f #f)
525 ; Floating point values.
526 (dfm 'SF "32 bit float" '(FN-SUPPORT) 'FLOAT
527 32 4 "" "'f'" #f #f #f)
528 (dfm 'DF "64 bit float" '(FN-SUPPORT) 'FLOAT
529 64 8 "" "'f'" #f #f #f)
530 (dfm 'XF "80/96 bit float" '(FN-SUPPORT) 'FLOAT
531 96 12 "" "'F'" #f #f #f)
532 (dfm 'TF "128 bit float" '(FN-SUPPORT) 'FLOAT
533 128 16 "" "'F'" #f #f #f)
535 ; These are useful modes that represent host values.
536 ; For INT/UINT the sizes indicate maximum portable values.
537 ; These are also used for random width hardware elements (e.g. immediates
539 ; FIXME: Can't be used to represent both host and target values.
540 ; Either remove the distinction or add new modes with the distinction.
541 (dfm 'INT "portable int" '() 'INT 32 4 "int" "'x'"
542 (mode:lookup 'SI) #f #t)
543 (dfm 'UINT "portable unsigned int" '() 'UINT 32 4 "unsigned int" "'x'"
544 (mode:lookup 'SI) #f #t)
547 (dfm 'PTR "host pointer" '() 'RANDOM 0 0 "PTR" "'x'"
548 #f (mode:lookup 'VOID) #t)
551 (set! VOID (mode:lookup 'VOID))
552 (set! DFLT (mode:lookup 'DFLT))
554 (set! INT (mode:lookup 'INT))
555 (set! UINT (mode:lookup 'UINT))
557 ; While setting the real values of WI/UWI/AI/IAI is defered to
558 ; mode-set-word-modes!, create entries in the list.
559 (set! WI (mode:add! 'WI (mode:lookup 'VOID)))
560 (set! UWI (mode:add! 'UWI (mode:lookup 'VOID)))
561 (set! AI (mode:add! 'AI (mode:lookup 'VOID)))
562 (set! IAI (mode:add! 'IAI (mode:lookup 'VOID)))
564 ; Keep the fields sorted for mode-find.
565 (set! mode-list (reverse mode-list))
570 (define (mode-finish!)