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51248e6e DK |
1 | ;;; Guile Emac Lisp |
2 | ||
3 | ;; Copyright (C) 2001 Free Software Foundation, Inc. | |
4 | ||
5 | ;; This program is free software; you can redistribute it and/or modify | |
6 | ;; it under the terms of the GNU General Public License as published by | |
7 | ;; the Free Software Foundation; either version 2, or (at your option) | |
8 | ;; any later version. | |
9 | ;; | |
10 | ;; This program is distributed in the hope that it will be useful, | |
11 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | ;; GNU General Public License for more details. | |
14 | ;; | |
15 | ;; You should have received a copy of the GNU General Public License | |
16 | ;; along with this program; see the file COPYING. If not, write to | |
17 | ;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | ;; Boston, MA 02111-1307, USA. | |
19 | ||
20 | ;;; Code: | |
21 | ||
22 | (define-module (language elisp compile-tree-il) | |
23 | #:use-module (language tree-il) | |
24 | #:use-module (system base pmatch) | |
25 | #:export (compile-tree-il)) | |
26 | ||
27 | ||
28 | ; Find the source properties of some parsed expression if there are any | |
29 | ; associated with it. | |
30 | ||
31 | (define (location x) | |
32 | (and (pair? x) | |
33 | (let ((props (source-properties x))) | |
34 | (and (not (null? props)) | |
35 | props)))) | |
36 | ||
37 | ||
fdfb36de | 38 | ; Value to use for Elisp's nil and t. |
4530432e | 39 | |
a4316739 | 40 | (define (nil-value loc) (make-const loc #f)) |
fdfb36de | 41 | (define (t-value loc) (make-const loc #t)) |
4530432e DK |
42 | |
43 | ||
344927c3 DK |
44 | ; Modules that contain the value and function slot bindings. |
45 | ||
46 | (define runtime '(language elisp runtime)) | |
47 | (define value-slot '(language elisp runtime value-slot)) | |
48 | (define function-slot '(language elisp runtime function-slot)) | |
49 | ||
50 | ||
51 | ; Error reporting routine for syntax/compilation problems. | |
52 | ||
53 | (define (report-error loc . args) | |
54 | (apply error args)) | |
55 | ||
56 | ||
57 | ; Generate code to ensure a fluid is there for further use of a given symbol. | |
58 | ||
59 | (define (ensure-fluid! loc sym module) | |
60 | ; FIXME: Do this! | |
61 | (make-void loc)) | |
62 | ||
63 | ||
64 | ; Generate code to reference a fluid saved variable. | |
65 | ||
66 | (define (reference-variable loc sym module) | |
67 | (make-sequence loc | |
68 | (list (ensure-fluid! loc sym module) | |
69 | (make-application loc (make-primitive-ref loc 'fluid-ref) | |
70 | (list (make-module-ref loc module sym #f)))))) | |
71 | ||
72 | ||
73 | ; Reference a variable and error if the value is void. | |
74 | ||
75 | (define (reference-with-check loc sym module) | |
76 | (let ((var (gensym))) | |
77 | (make-let loc '(value) `(,var) `(,(reference-variable loc sym module)) | |
78 | (make-conditional loc | |
79 | (make-application loc (make-primitive-ref loc 'eq?) | |
80 | (list (make-module-ref loc runtime 'void #t) | |
81 | (make-lexical-ref loc 'value var))) | |
82 | (make-application loc (make-primitive-ref loc 'error) | |
83 | (list (make-const loc "variable is void:") | |
84 | (make-const loc sym))) | |
85 | (make-lexical-ref loc 'value var))))) | |
86 | ||
87 | ||
88 | ; Generate code to set a fluid saved variable. | |
89 | ||
90 | (define (set-variable! loc sym module value) | |
91 | (make-sequence loc | |
92 | (list (ensure-fluid! loc sym module) | |
93 | (make-application loc (make-primitive-ref loc 'fluid-set!) | |
94 | (list (make-module-ref loc module sym #f) | |
95 | value))))) | |
96 | ||
97 | ||
51248e6e DK |
98 | ; Compile a symbol expression. This is a variable reference or maybe some |
99 | ; special value like nil. | |
100 | ||
101 | (define (compile-symbol loc sym) | |
102 | (case sym | |
103 | ||
fdfb36de | 104 | ((nil) (nil-value loc)) |
51248e6e | 105 | |
fdfb36de | 106 | ((t) (t-value loc)) |
51248e6e | 107 | |
51248e6e | 108 | (else |
344927c3 | 109 | (reference-with-check loc sym value-slot)))) |
51248e6e DK |
110 | |
111 | ||
112 | ; Compile a pair-expression (that is, any structure-like construct). | |
113 | ||
114 | (define (compile-pair loc expr) | |
115 | (pmatch expr | |
116 | ||
117 | ((progn . ,forms) | |
118 | (make-sequence loc (map compile-expr forms))) | |
119 | ||
120 | ((if ,condition ,ifclause) | |
121 | (make-conditional loc (compile-expr condition) | |
122 | (compile-expr ifclause) | |
4530432e | 123 | (nil-value loc))) |
51248e6e DK |
124 | ((if ,condition ,ifclause ,elseclause) |
125 | (make-conditional loc (compile-expr condition) | |
126 | (compile-expr ifclause) | |
127 | (compile-expr elseclause))) | |
128 | ((if ,condition ,ifclause . ,elses) | |
129 | (make-conditional loc (compile-expr condition) | |
130 | (compile-expr ifclause) | |
131 | (make-sequence loc (map compile-expr elses)))) | |
132 | ||
a4316739 DK |
133 | ; For (cond ...) forms, a special case is a (condition) clause without |
134 | ; body. In this case, the value of condition itself should be returned, | |
135 | ; and thus is saved in a local variable for testing and returning, if it | |
136 | ; is found true. | |
51248e6e DK |
137 | ((cond . ,clauses) (guard (and-map (lambda (el) |
138 | (and (list? el) (not (null? el)))) | |
139 | clauses)) | |
140 | (let iterate ((tail clauses)) | |
141 | (if (null? tail) | |
4530432e | 142 | (nil-value loc) |
51248e6e | 143 | (let ((cur (car tail))) |
a4316739 DK |
144 | (if (null? (cdr cur)) |
145 | (let ((var (gensym))) | |
146 | (make-let loc | |
147 | '(condition) `(,var) `(,(compile-expr (car cur))) | |
148 | (make-conditional loc | |
149 | (make-lexical-ref loc 'condition var) | |
150 | (make-lexical-ref loc 'condition var) | |
151 | (iterate (cdr tail))))) | |
152 | (make-conditional loc | |
153 | (compile-expr (car cur)) | |
154 | (make-sequence loc (map compile-expr (cdr cur))) | |
155 | (iterate (cdr tail)))))))) | |
51248e6e | 156 | |
fdfb36de | 157 | ((and) (t-value loc)) |
51248e6e DK |
158 | ((and . ,expressions) |
159 | (let iterate ((tail expressions)) | |
160 | (if (null? (cdr tail)) | |
161 | (compile-expr (car tail)) | |
162 | (make-conditional loc | |
163 | (compile-expr (car tail)) | |
164 | (iterate (cdr tail)) | |
4530432e | 165 | (nil-value loc))))) |
51248e6e | 166 | |
fdfb36de DK |
167 | ((or . ,expressions) |
168 | (let iterate ((tail expressions)) | |
169 | (if (null? tail) | |
170 | (nil-value loc) | |
171 | (let ((var (gensym))) | |
172 | (make-let loc | |
173 | '(condition) `(,var) `(,(compile-expr (car tail))) | |
174 | (make-conditional loc | |
175 | (make-lexical-ref loc 'condition var) | |
176 | (make-lexical-ref loc 'condition var) | |
177 | (iterate (cdr tail)))))))) | |
178 | ||
344927c3 DK |
179 | ; Build a set form for possibly multiple values. The code is not formulated |
180 | ; tail recursive because it is clearer this way and large lists of symbol | |
181 | ; expression pairs are very unlikely. | |
182 | ((setq . ,args) | |
183 | (make-sequence loc | |
184 | (let iterate ((tail args)) | |
185 | (if (null? tail) | |
186 | (list (make-void loc)) | |
187 | (let ((sym (car tail)) | |
188 | (tailtail (cdr tail))) | |
189 | (if (not (symbol? sym)) | |
190 | (report-error loc "expected symbol in setq") | |
191 | (if (null? tailtail) | |
192 | (report-error loc "missing value for symbol in setq" sym) | |
193 | (let* ((val (compile-expr (car tailtail))) | |
194 | (op (set-variable! loc sym value-slot val))) | |
195 | (cons op (iterate (cdr tailtail))))))))))) | |
196 | ||
51248e6e DK |
197 | (('quote ,val) |
198 | (make-const loc val)) | |
199 | ||
200 | (else | |
344927c3 | 201 | (report-error loc "unrecognized elisp" expr)))) |
51248e6e DK |
202 | |
203 | ||
204 | ; Compile a single expression to TreeIL. | |
205 | ||
206 | (define (compile-expr expr) | |
207 | (let ((loc (location expr))) | |
208 | (cond | |
209 | ((symbol? expr) | |
210 | (compile-symbol loc expr)) | |
211 | ((pair? expr) | |
212 | (compile-pair loc expr)) | |
213 | (else (make-const loc expr))))) | |
214 | ||
215 | ||
216 | ; Entry point for compilation to TreeIL. | |
217 | ||
218 | (define (compile-tree-il expr env opts) | |
219 | (values | |
220 | (compile-expr expr) | |
221 | env | |
222 | env)) |