1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #ifndef	_PARSEPROTO_H
28 #define	_PARSEPROTO_H
29 
30 #ifdef	__cplusplus
31 extern "C" {
32 #endif
33 
34 /*
35  * DECL - parse C type declarations.
36  *
37  * 1) Does not understand struct, union or enum definitions.
38  * 2) Does not understand auto, static, extern or typedef storage class
39  *    specifiers.
40  * 3) Does not support initialization.
41  * 4) Does not support type definition.
42  * 5) Only understands array dimension specified as constant decimal
43  *    integer or identifier.
44  *
45  * Supported Operations
46  *
47  *    decl_Parse        convert string to a decl_t.
48  *    decl_Destroy      Free space associated with a (previously returned)
49  *                      decl_t. The function follows the argument list.
50  *    decl_SetName      set identifier.
51  *    decl_GetName      return identifier.
52  *    decl_ToString     convert a (previously returned) decl_t into a
53  *                      printable representation.
54  *    decl_GetArgLength return length of argument list.
55  *    decl_GetNext      return the next decl_t associated with the given
56  *                      decl_t.
57  *    decl_GetDeclSpec	return the declaration specifier.
58  *    decl_GetDSName    return identifier associated with a
59  *			declaration specifier.
60  *    decl_GetType      return the type_t associated with a decl_t.
61  *    decl_IsVarargs    return true if the given decl_t is a varargs function.
62  *    decl_IsFunction   return true if the given decl_t is a function.
63  *
64  *    type_GetNext      return the next type_t associated with a given type_t.
65  *    type_IsArray      return true if the given type_t is an array.
66  *    type_GetArraySize return size of array.
67  *
68  *    type_IsPtrTo      return true if the given type_t is a pointer to ... .
69  *    type_GetPtrToTypeQual    return type qualifiers for a pointer to ... .
70  *
71  *    type_IsFunction   return true if the given type_t is a function.
72  *    type_GetArgLength return length of argument list.
73  *    type_IsVarargs    return true if function signature includes ... .
74  *    type_GetArg       return the decl_t associated with a given type_t.
75  *    type_IsPtrFun     return true if the given type_t is a pointer* to a
76  *                      function.
77  */
78 
79 /* Include Files */
80 
81 #include <stdio.h>
82 #include <ctype.h>
83 #include <string.h>
84 
85 /* Macros and Constants */
86 
87 #define	loop	for (;;)
88 
89 #define	STT_isvoid(s)	((s) & (TS_VOID))
90 #define	STT_isfloat(s)	((s) & (TS_FLOAT | TS_DOUBLE))
91 #define	STT_ischar(s)	((s) & (TS_CHAR))
92 #define	STT_isint(s)	((s) & \
93 			(TS_SHORT | TS_INT | TS_LONG | TS_LONGLONG | TS_CHAR))
94 #define	STT_isarith(s)	(STT_isfloat(s) || STT_isint(s))
95 #define	STT_isbasic(s)	(STT_isarith(s) || STT_isvoid(s))
96 #define	STT_isderived(s) ((s) & (TS_STRUCT | TS_UNION | TS_ENUM | TS_TYPEDEF))
97 #define	STT_has_explicit_sign(s)	((s) & (TS_SIGNED | TS_UNSIGNED))
98 
99 /* Data Declarations */
100 
101 /*
102  * The overall type encoding is thus:
103  *
104  *    decl_t encodes a declaration which consists of:
105  *        identifier
106  *            declaration specifier (storage class specifier, type specifier,
107  *              type qualifier)
108  *            type modifiers (array, function, pointer to)
109  *              ancillary (varargs?, argument list)
110  *
111  *    The argument list is an ordered, NULL terminated, linked list.
112  *
113  *    An empty argument list (== NULL) indicates an unknown argument
114  *       list, i.e. "()".
115  *
116  *    declaration specifiers are encoded as bits in an enum (stt_t).
117  *
118  *    type modifiers are encoded as a linked list of variant records,
119  *        i.e. "array of ..."
120  *		"function returning ..." and "pointer to ...".
121  *
122  *    An empty list of type modifiers (== NULL) indicates a "plain" type.
123  *
124  *
125  * OK, here goes some ASCII art...
126  *
127  *
128  * base object
129  *     |
130  *     |
131  *     V
132  *
133  * ----------      ----------      ----------       ----------
134  * |        |      |        |      |        |       |        |
135  * | decl_t |  --> | type_t |  --> | type_t |  ...  | type_t |  --> NULL
136  * |        |      |        |      |(DD_FUN)|       |        |
137  * ----------      ----------      ----------       ----------
138  *     |                               |
139  *     |                               |
140  *     V                               V
141  *                           A     ----------      ----------
142  *    NULL                   r     |        |      |        |
143  *                           g     | decl_t |  --> | type_t |  ... --> NULL
144  *                           u     |        |      |        |
145  *                           m     ----------      ----------
146  *                           e         |
147  *                           n         |
148  *                           t         V
149  *                                 ----------
150  *                           L     |        |
151  *                           i     | decl_t |  ... --> NULL
152  *                           s     |        |
153  *                           t     ----------
154  *
155  *                                    ...
156  *
157  *                                     |
158  *	                               |
159  *	                               V
160  *
161  *	                              NULL
162  */
163 
164 /*
165  * The encoding of a declaration specifier is done primarily with an
166  * stt_t type.
167  * This type must support bit-wise operations.
168  */
169 
170 typedef enum {
171 	SCS_MASK	= 0x000000ff,	/* storage class specifiers */
172 	SCS_NONE	= 0x00000000,
173 	SCS_REGISTER	= 0x00000001,
174 	SCS_TYPEDEF	= 0x00000002,
175 	SCS_EXTERN	= 0x00000004,
176 	SCS_AUTO	= 0x00000008,
177 	SCS_STATIC	= 0x00000010,
178 
179 	TS_MASK		= 0x00ffff00,	/* type specifiers */
180 	TS_NO_TS	= 0x00000000,
181 	TS_CHAR		= 0x00000100,
182 	TS_SHORT	= 0x00000200,
183 	TS_INT		= 0x00000400,
184 	TS_LONG		= 0x00000800,
185 	TS_SIGNED	= 0x00001000,
186 	TS_UNSIGNED	= 0x00002000,
187 	TS_ENUM		= 0x00004000,
188 	TS_FLOAT	= 0x00010000,
189 	TS_DOUBLE	= 0x00020000,
190 	TS_STRUCT	= 0x00040000,
191 	TS_UNION	= 0x00080000,
192 	TS_TYPEDEF	= 0x00100000,
193 	TS_VOID		= 0x00200000,
194 	TS_LONGLONG	= 0x00400000,	/* non-ANSI type: long long */
195 
196 	TQ_MASK		= 0x0f000000,	/* type qualifiers */
197 	TQ_NONE		= 0x00000000,
198 	TQ_CONST	= 0x01000000,
199 	TQ_VOLATILE	= 0x02000000,
200 	TQ_RESTRICT	= 0x04000000,
201 	TQ_RESTRICT_KYWD = 0x08000000
202 } stt_t;
203 
204 typedef enum {			/* declarator options */
205 	DD_NONE	= 0,
206 	DD_ARY	= 1,		/* array of [size] ... */
207 	DD_FUN	= 2,		/* function [taking and] returning ... */
208 	DD_PTR	= 3		/* [tq] pointer to ... */
209 } decl_type_t;
210 
211 typedef enum {
212 	DTS_DECL = 0,
213 	DTS_CAST = 1,
214 	DTS_RET  = 3
215 } decl_dts_t;
216 
217 typedef struct {
218 	stt_t	 ds_stt;	/* scs|ts|tq */
219 	char	*ds_id;		/* id for struct|union|enum|typedef */
220 } decl_spec_t;
221 
222 typedef struct _declarator	decl_t;
223 
224 typedef struct _type {
225 	struct _type	*t_next;	/* next type_t or NULL */
226 	decl_type_t	 t_dt;		/* oneof DD_* */
227 	/* DD_FUN */
228 	int		 t_nargs;	/* number of arguments */
229 	int		 t_ellipsis;	/* a varargs? */
230 	decl_t		*t_args;	/* list of arguments */
231 	/* DD_PTR */
232 	stt_t		 t_stt;		/* type qualifier, TQ_* */
233 	/* DD_ARY */
234 	char		*t_sizestr;	/* size as a string */
235 } type_t;
236 
237 struct _declarator {
238 	char		*d_name;	/* name of declarator */
239 	decl_spec_t	*d_ds;		/* ts|scs|tq */
240 	type_t		*d_type;	/* list of attributes or NULL */
241 	int		 d_ellipsis;	/* a varargs? */
242 	decl_t		*d_next;	/* next link in chain (arglist) */
243 };
244 
245 /* External Declarations */
246 
247 extern	char		*declspec_ToString(char *, decl_spec_t *);
248 
249 extern	void		decl_Destroy(decl_t *);
250 extern	int		decl_GetArgLength(decl_t *);
251 extern	decl_t		*decl_SetName(decl_t *, char *);
252 extern	char		*decl_GetName(decl_t *);
253 extern	type_t		*decl_GetType(decl_t *);
254 extern	int		decl_IsVarargs(decl_t *dp);
255 extern	char		*decl_ToString(char *, decl_dts_t, decl_t *,
256 			    const char *);
257 extern	const char	*decl_Parse(char *, decl_t **);
258 extern	void		decl_GetTraceInfo(decl_t *, char *, char *, decl_t **);
259 extern	char 		*decl_ToFormal(decl_t *);
260 extern	int		type_IsArray(type_t *);
261 extern	int		type_IsPtrTo(type_t *);
262 extern	int		type_IsFunction(type_t *);
263 extern	int		type_IsVarargs(type_t *);
264 extern	int		type_IsPtrFun(type_t *);
265 extern	decl_t		*decl_AddArgNames(decl_t *);
266 
267 #ifdef	__cplusplus
268 }
269 #endif
270 
271 #endif	/* _PARSEPROTO_H */
272