1 ;;;; This file contains backend-specific data. The original intent, in
2 ;;;; CMU CL, was to allow compilation using different backends, as a
3 ;;;; way of mutating a running CMU CL into a hybrid system which could
4 ;;;; emit code for a different architecture. In SBCL, this is not
5 ;;;; needed, since we have a cross-compiler which runs as an ordinary
6 ;;;; Lisp program under SBCL or other Lisps. However, it still seems
7 ;;;; reasonable to have all backendish things here in a single file.
9 ;;;; FIXME: Perhaps someday the vmdef.lisp and/or meta-vmdef.lisp stuff can
10 ;;;; merged into this file, and/or the metaness can go away or at least be
11 ;;;; radically simplified.
13 ;;;; This software is part of the SBCL system. See the README file for
14 ;;;; more information.
16 ;;;; This software is derived from the CMU CL system, which was
17 ;;;; written at Carnegie Mellon University and released into the
18 ;;;; public domain. The software is in the public domain and is
19 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
20 ;;;; files for more information.
27 ;;;; miscellaneous backend properties
29 ;;; the conventional file extension for fasl files on this architecture,
31 (defvar *backend-fasl-file-type* nil)
32 (declaim (type (or simple-string null) *backend-fasl-file-type*))
34 ;;; implementation and version of fasl files used
35 (defvar *backend-fasl-file-implementation* nil)
36 (defvar *backend-fasl-file-version* nil)
37 (declaim (type (or keyword null) *backend-fasl-file-implementation*))
38 (declaim (type (or index null) *backend-fasl-file-version*))
40 ;;; the number of references that a TN must have to offset the overhead of
41 ;;; saving the TN across a call
42 (defvar *backend-register-save-penalty* 0)
43 (declaim (type index *backend-register-save-penalty*))
45 ;;; the byte order of the target machine. :BIG-ENDIAN has the MSB first (e.g.
46 ;;; IBM RT), :LITTLE-ENDIAN has the MSB last (e.g. DEC VAX).
48 ;;; KLUDGE: In a sort of pun, this is also used as the value of
49 ;;; BACKEND-BYTE-FASL-FILE-IMPLEMENTATION. -- WHN 20000302
50 (defvar *backend-byte-order* nil)
51 (declaim (type (member nil :little-endian :big-endian) *backend-byte-order*))
53 ;;; translation from SC numbers to SC info structures. SC numbers are always
54 ;;; used instead of names at run time, so changing this vector changes all the
56 (defvar *backend-sc-numbers* (make-array sc-number-limit :initial-element nil))
57 (declaim (type sc-vector *backend-sc-numbers*))
59 ;;; a list of all the SBs defined, so that we can easily iterate over them
60 (defvar *backend-sb-list* ())
61 (declaim (type list *backend-sb-list*))
63 ;;; translation from template names to template structures
64 (defvar *backend-template-names* (make-hash-table :test 'eq))
65 (declaim (type hash-table *backend-template-names*))
67 ;;; hashtables mapping from SC and SB names to the corresponding structures
70 ;;; The META versions are only used at meta-compile and load times,
71 ;;; so the defining macros can change these at meta-compile time
72 ;;; without breaking the compiler.
73 ;;; FIXME: Couldn't the META versions go away in SBCL now that we don't
74 ;;; have to worry about metacompiling and breaking the compiler?
75 (defvar *backend-sc-names* (make-hash-table :test 'eq))
76 (defvar *backend-sb-names* (make-hash-table :test 'eq))
77 (defvar *backend-meta-sc-names* (make-hash-table :test 'eq))
78 (defvar *backend-meta-sb-names* (make-hash-table :test 'eq))
79 (declaim (type hash-table
82 *backend-meta-sc-names*
83 *backend-meta-sb-names*))
86 ;;; like *SC-NUMBERS*, but updated at meta-compile time
88 ;;; FIXME: As per *BACKEND-META-SC-NAMES* and *BACKEND-META-SB-NAMES*,
89 ;;; couldn't we get rid of this in SBCL?
90 (defvar *backend-meta-sc-numbers*
91 (make-array sc-number-limit :initial-element nil))
92 (declaim (type sc-vector *backend-meta-sc-numbers*))
94 ;;; translations from primitive type names to the corresponding
95 ;;; primitive-type structure.
96 (defvar *backend-primitive-type-names*
97 (make-hash-table :test 'eq))
98 (declaim (type hash-table *backend-primitive-type-names*))
100 ;;; This establishes a convenient handle on primitive type unions, or
101 ;;; whatever. These names can only be used as the :ARG-TYPES or
102 ;;; :RESULT-TYPES for VOPs and can map to anything else that can be
103 ;;; used as :ARG-TYPES or :RESULT-TYPES (e.g. :OR, :CONSTANT).
104 (defvar *backend-primitive-type-aliases* (make-hash-table :test 'eq))
105 (declaim (type hash-table *backend-primitive-type-aliases*))
107 ;;; meta-compile time translation from names to primitive types
109 ;;; FIXME: As per *BACKEND-META-SC-NAMES* and *BACKEND-META-SB-NAMES*,
110 ;;; couldn't we get rid of this in SBCL?
111 (defvar *backend-meta-primitive-type-names* (make-hash-table :test 'eq))
112 (declaim (type hash-table *meta-primitive-type-names*))
114 ;;; The primitive type T is somewhat magical, in that it is the only
115 ;;; primitive type that overlaps with other primitive types. An object
116 ;;; of primitive-type T is in the canonical descriptor (boxed or pointer)
119 ;;; The T primitive-type is kept in this variable so that people who
120 ;;; have to special-case it can get at it conveniently. This variable
121 ;;; has to be set by the machine-specific VM definition, since the
122 ;;; DEF-PRIMITIVE-TYPE for T must specify the SCs that boxed objects
123 ;;; can be allocated in.
124 (defvar *backend-t-primitive-type*)
125 (declaim (type primitive-type *backend-t-primitive-type*))
127 ;;; a hashtable translating from VOP names to the corresponding VOP-Parse
128 ;;; structures. This information is only used at meta-compile time.
129 (defvar *backend-parsed-vops* (make-hash-table :test 'eq))
130 (declaim (type hash-table *backend-parsed-vops*))
132 ;;; the backend-specific aspects of the info environment
133 (defvar *backend-info-environment* nil)
134 (declaim (type list *backend-info-environment*))
136 ;;; support for the assembler
137 (defvar *backend-instruction-formats* (make-hash-table :test 'eq))
138 (defvar *backend-instruction-flavors* (make-hash-table :test 'equal))
139 (defvar *backend-special-arg-types* (make-hash-table :test 'eq))
140 (declaim (type hash-table
141 *backend-instruction-formats*
142 *backend-instruction-flavors*
143 *backend-special-arg-types*))
145 ;;; mappings between CTYPE structures and the corresponding predicate.
146 ;;; The type->predicate mapping is implemented as an alist because
147 ;;; there is no such thing as a TYPE= hash table.
148 (defvar *backend-predicate-types* (make-hash-table :test 'eq))
149 (defvar *backend-type-predicates* nil)
150 (declaim (type hash-table *backend-predicate-types*))
151 (declaim (type list *backend-type-predicates*))
153 ;;; a vector of the internal errors defined for this backend, or NIL if
154 ;;; they haven't been installed yet
155 (defvar *backend-internal-errors* nil)
156 (declaim (type (or simple-vector null) *backend-internal-errors*))
158 ;;; the maximum number of bytes per page on this system (used by GENESIS)
159 (defvar *backend-page-size* 0)
160 (declaim (type index *backend-page-size*))
162 ;;;; VM support routines
164 ;;; FIXME: Do we need this kind of indirection for the VM support
165 ;;; routines any more?
167 ;;; forward declaration
168 (defvar *backend-support-routines*)
170 (macrolet ((def-vm-support-routines (&rest routines)
172 (eval-when (:compile-toplevel :load-toplevel :execute)
173 (defparameter *vm-support-routines* ',routines))
174 (defstruct vm-support-routines
175 ,@(mapcar #'(lambda (routine)
176 `(,routine nil :type (or function null)))
180 `(defun ,name (&rest args)
181 (apply (or (,(symbolicate "VM-SUPPORT-ROUTINES-"
183 *backend-support-routines*)
184 (error "machine-specific support ~S ~
190 (def-vm-support-routines
193 immediate-constant-sc
196 ;; from primtype.lisp
204 standard-argument-location
205 make-return-pc-passing-location
206 make-old-fp-passing-location
207 make-old-fp-save-location
208 make-return-pc-save-location
209 make-argument-count-location
211 make-stack-pointer-tn
212 make-number-stack-pointer-tn
213 make-unknown-values-locations
214 select-component-format
218 make-dynamic-state-tns
219 make-nlx-entry-argument-start-location
222 generate-call-sequence
223 generate-return-sequence
225 ;; for use with scheduler
229 (defprinter (vm-support-routines))
231 (defmacro def-vm-support-routine (name ll &body body)
232 (unless (member (intern (string name) (find-package "SB!C"))
233 *vm-support-routines*)
234 (warn "unknown VM support routine: ~A" name))
235 (let ((local-name (symbolicate "IMPL-OF-VM-SUPPORT-ROUTINE-" name)))
237 (defun ,local-name ,ll ,@body)
238 (setf (,(intern (concatenate 'simple-string
239 "VM-SUPPORT-ROUTINES-"
241 (find-package "SB!C"))
242 *backend-support-routines*)
245 ;;; the VM support routines
246 (defvar *backend-support-routines* (make-vm-support-routines))
247 (declaim (type vm-support-routines *backend-support-routines*))
251 (defun backend-byte-fasl-file-implementation ()
252 *backend-byte-order*)
254 (defun backend-byte-fasl-file-type ()
255 (ecase *backend-byte-order*
256 (:big-endian "bytef")
257 (:little-endian "lbytef")))