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1 | ;;; -*-lisp-*- |
2 | ;;; | |
3 | ;;; Code generation protocol implementation | |
4 | ;;; | |
5 | ;;; (c) 2009 Straylight/Edgeware | |
6 | ;;; | |
7 | ||
8 | ;;;----- Licensing notice --------------------------------------------------- | |
9 | ;;; | |
10 | ;;; This file is part of the Sensble Object Design, an object system for C. | |
11 | ;;; | |
12 | ;;; SOD is free software; you can redistribute it and/or modify | |
13 | ;;; it under the terms of the GNU General Public License as published by | |
14 | ;;; the Free Software Foundation; either version 2 of the License, or | |
15 | ;;; (at your option) any later version. | |
16 | ;;; | |
17 | ;;; SOD is distributed in the hope that it will be useful, | |
18 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;;; GNU General Public License for more details. | |
21 | ;;; | |
22 | ;;; You should have received a copy of the GNU General Public License | |
23 | ;;; along with SOD; if not, write to the Free Software Foundation, | |
24 | ;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
25 | ||
26 | (cl:in-package #:sod) | |
27 | ||
28 | ;;;-------------------------------------------------------------------------- | |
29 | ;;; Temporary names. | |
30 | ||
31 | (export '(temporary-argument temporary-function)) | |
32 | (defclass temporary-argument (temporary-name) ()) | |
33 | (defclass temporary-function (temporary-name) ()) | |
34 | ||
35 | (export 'temporary-variable) | |
36 | (defclass temporary-variable (temporary-name) | |
37 | ((in-use-p :initarg :in-use-p :initform nil | |
38 | :type boolean :accessor var-in-use-p))) | |
39 | ||
40 | (defmethod commentify-argument-name ((name temporary-name)) | |
41 | nil) | |
42 | ||
43 | (export 'temporary-function) | |
44 | (defun temporary-function () | |
45 | "Return a temporary function name." | |
46 | (make-instance 'temporary-function | |
47 | :tag (prog1 *temporary-index* (incf *temporary-index*)))) | |
48 | ||
49 | (defmethod format-temporary-name ((var temporary-name) stream) | |
50 | (format stream "~A" (temp-tag var))) | |
51 | (defmethod format-temporary-name ((var temporary-argument) stream) | |
52 | (format stream "sod__a~A" (temp-tag var))) | |
53 | (defmethod format-temporary-name ((var temporary-variable) stream) | |
54 | (format stream "sod__v~A" (temp-tag var))) | |
55 | (defmethod format-temporary-name ((var temporary-function) stream) | |
56 | (format stream "sod__f~A" (temp-tag var))) | |
57 | ||
58 | (defmethod print-object ((var temporary-name) stream) | |
59 | (if *print-escape* | |
60 | (print-unreadable-object (var stream :type t) | |
61 | (prin1 (temp-tag var) stream)) | |
62 | (format-temporary-name var stream))) | |
63 | ||
64 | ;;;-------------------------------------------------------------------------- | |
65 | ;;; Instruction types. | |
66 | ||
67 | ;; Compound statements. | |
68 | ||
69 | (export '(if-inst make-if-inst | |
70 | while-inst make-while-inst | |
71 | do-inst make-do-inst | |
72 | inst-condition inst-consequent inst-alternative inst-body)) | |
73 | ||
74 | (definst if (stream) (condition consequent alternative) | |
75 | (format-compound-statement (stream consequent alternative) | |
76 | (format stream "if (~A)" condition)) | |
77 | (when alternative | |
78 | (format-compound-statement (stream alternative) | |
79 | (write-string "else" stream)))) | |
80 | ||
81 | (definst while (stream) (condition body) | |
82 | (format-compound-statement (stream body) | |
83 | (format stream "while (~A)" condition))) | |
84 | ||
85 | (definst do-while (stream) (body condition) | |
86 | (format-compound-statement (stream body :space) | |
87 | (write-string "do" stream)) | |
88 | (format stream "while (~A);" condition)) | |
89 | ||
90 | ;; Special varargs hacks. | |
91 | ||
92 | (export '(va-start-inst make-va-start-inst | |
93 | va-copy-inst make-va-copy-inst | |
94 | va-end-inst make-va-end-inst | |
95 | inst-ap inst-arg inst-to inst-from)) | |
96 | ||
97 | (definst va-start (stream) (ap arg) | |
98 | (format stream "va_start(~@<~A, ~_~A~:>);" ap arg)) | |
99 | ||
100 | (definst va-copy (stream) (to from) | |
101 | (format stream "va_copy(~@<~A, ~_~A~:>);" to from)) | |
102 | ||
103 | (definst va-end (stream) (ap) | |
104 | (format stream "va_end(~A);" ap)) | |
105 | ||
106 | ;; Expressions. | |
107 | ||
108 | (export '(call-inst make-call-inst inst-func inst-args)) | |
109 | ||
110 | (definst call (stream) (func args) | |
111 | (format stream "~A(~@<~{~A~^, ~_~}~:>)" func args)) | |
112 | ||
113 | ;;;-------------------------------------------------------------------------- | |
114 | ;;; Code generator objects. | |
115 | ||
116 | (defclass basic-codegen () | |
117 | ((vars :initarg :vars :initform nil :type list :accessor codegen-vars) | |
118 | (insts :initarg :insts :initform nil :type list :accessor codegen-insts) | |
119 | (temp-index :initarg :temp-index :initform 0 | |
120 | :type fixnum :accessor codegen-temp-index)) | |
121 | (:documentation | |
122 | "Base class for code generator state. | |
123 | ||
124 | This contains the bare essentials for supporting the EMIT-INST and | |
125 | ENSURE-VAR protocols; see the documentation for those generic functions | |
126 | for more details. | |
127 | ||
128 | This class isn't abstract. A full CODEGEN object uses instances of this | |
129 | to keep track of pending functions which haven't been completed yet. | |
130 | ||
131 | Just in case that wasn't clear enough: this is nothing to do with the | |
132 | BASIC language.")) | |
133 | ||
134 | (defmethod emit-inst ((codegen basic-codegen) inst) | |
135 | (push inst (codegen-insts codegen))) | |
136 | ||
137 | (defmethod emit-insts ((codegen basic-codegen) insts) | |
138 | (asetf (codegen-insts codegen) (revappend insts it))) | |
139 | ||
140 | (defmethod ensure-var ((codegen basic-codegen) name type &optional init) | |
141 | (let* ((vars (codegen-vars codegen)) | |
142 | (var (find name vars :key #'inst-name :test #'equal))) | |
143 | (cond ((not var) | |
144 | (setf (codegen-vars codegen) | |
145 | (cons (make-var-inst name type init) vars))) | |
146 | ((not (c-type-equal-p type (inst-type var))) | |
147 | (error "(Internal) Redefining type for variable ~A." name))) | |
148 | name)) | |
149 | ||
150 | (export 'codegen) | |
151 | (defclass codegen (basic-codegen) | |
152 | ((functions :initform nil :type list :accessor codegen-functions) | |
153 | (stack :initform nil :type list :accessor codegen-stack)) | |
154 | (:documentation | |
155 | "A full-fat code generator which can generate and track functions. | |
156 | ||
157 | This is the real deal. Subclasses may which to attach additional state | |
158 | for convenience's sake, but this class is self-contained. It supports the | |
159 | CODEGEN-PUSH, CODEGEN-POP and CODEGEN-POP-FUNCTION protocols.")) | |
160 | ||
161 | (defmethod codegen-push ((codegen codegen)) | |
162 | (with-slots (vars insts temp-index stack) codegen | |
163 | (push (make-instance 'basic-codegen | |
164 | :vars vars | |
165 | :insts insts | |
166 | :temp-index temp-index) | |
167 | stack) | |
168 | (setf vars nil insts nil temp-index 0))) | |
169 | ||
170 | (defmethod codegen-pop ((codegen codegen)) | |
171 | (with-slots (vars insts temp-index stack) codegen | |
172 | (multiple-value-prog1 | |
173 | (values (nreverse vars) (nreverse insts)) | |
174 | (let ((sub (pop stack))) | |
175 | (setf vars (codegen-vars sub) | |
176 | insts (codegen-insts sub) | |
177 | temp-index (codegen-temp-index sub)))))) | |
178 | ||
179 | (defmethod codegen-add-function ((codegen codegen) function) | |
180 | (with-slots (functions) codegen | |
181 | (setf functions (nconc functions (list function))))) | |
182 | ||
183 | (defmethod temporary-var ((codegen basic-codegen) type) | |
184 | (with-slots (vars temp-index) codegen | |
185 | (or (some (lambda (var) | |
186 | (let ((name (inst-name var))) | |
187 | (if (and (not (var-in-use-p name)) | |
188 | (c-type-equal-p type (inst-type var))) | |
189 | name | |
190 | nil))) | |
191 | vars) | |
192 | (let* ((name (make-instance 'temporary-variable | |
193 | :in-use-p t | |
194 | :tag (prog1 temp-index | |
195 | (incf temp-index))))) | |
196 | (push (make-var-inst name type nil) vars) | |
197 | name)))) | |
198 | ||
199 | ;;;----- That's all, folks -------------------------------------------------- |