1 /*-
2 * SPDX-License-Identifier: MIT-CMU
3 *
4 * Mach Operating System
5 * Copyright (c) 1991,1990 Carnegie Mellon University
6 * All Rights Reserved.
7 *
8 * Permission to use, copy, modify and distribute this software and its
9 * documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation.
13 *
14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 *
18 * Carnegie Mellon requests users of this software to return to
19 *
20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
21 * School of Computer Science
22 * Carnegie Mellon University
23 * Pittsburgh PA 15213-3890
24 *
25 * any improvements or extensions that they make and grant Carnegie the
26 * rights to redistribute these changes.
27 */
28
29 #ifndef _DDB_DB_LEX_H_
30 #define _DDB_DB_LEX_H_
31
32 /*
33 * Author: David B. Golub, Carnegie Mellon University
34 * Date: 7/90
35 */
36 /*
37 * Lexical analyzer.
38 */
39
40 /*
41 * Options and flags can configure db_read_token() => db_lex() behavior.
42 *
43 * When a radix other than DRT_DEFAULT_RADIX is used, it overrides
44 * auto-detection, as well as the user-specified db_radix, in db_lex() of
45 * 'tNUMBER' tokens.
46 */
47 enum {
48 /* Infer or use db_radix using the old logic. */
49 DRT_DEFAULT_RADIX = 0,
50 /* The following set an explicit base for tNUMBER lex. */
51 DRT_OCTAL,
52 DRT_DECIMAL,
53 DRT_HEXADECIMAL,
54 };
55 #define DRT_RADIX_MASK 0x3
56 /*
57 * Flag bit powers of two for db_read_token_flags.
58 * The low 2 bits are reserved for radix selection.
59 *
60 * WSPACE: Yield explicit tWSPACE tokens when one or more whitespace characters
61 * is consumed.
62 * HEX: Allow tNUMBER tokens to start with 'A'-'F' without explicit "0x"
63 * prefix.
64 */
65 enum {
66 _DRT_WSPACE = 2,
67 _DRT_HEX,
68 };
69 #ifndef BIT
70 #define BIT(n) (1ull << (n))
71 #endif
72 enum {
73 DRT_WSPACE = BIT(_DRT_WSPACE),
74 DRT_HEX = BIT(_DRT_HEX),
75 };
76 #define DRT_VALID_FLAGS_MASK ((int)DRT_RADIX_MASK | \
77 DRT_WSPACE | \
78 DRT_HEX)
79
80 void db_flush_lex(void);
81 char *db_get_line(void);
82 void db_inject_line(const char *command);
83 int db_read_line(void);
84 int db_read_token_flags(int);
85 void db_unread_token(int t);
86
87 static inline int
db_read_token(void)88 db_read_token(void)
89 {
90 return (db_read_token_flags(0));
91 }
92
93 extern db_expr_t db_tok_number;
94 #define TOK_STRING_SIZE 120
95 extern char db_tok_string[TOK_STRING_SIZE];
96
97 #define tEOF (-1)
98 #define tEOL 1
99 #define tNUMBER 2
100 #define tIDENT 3
101 #define tPLUS 4
102 #define tMINUS 5
103 #define tDOT 6
104 #define tSTAR 7
105 #define tSLASH 8
106 #define tEQ 9
107 #define tLPAREN 10
108 #define tRPAREN 11
109 #define tPCT 12
110 #define tHASH 13
111 #define tCOMMA 14
112 #define tDITTO 15
113 #define tDOLLAR 16
114 #define tEXCL 17
115 #define tSHIFT_L 18
116 #define tSHIFT_R 19
117 #define tDOTDOT 20
118 #define tSEMI 21
119 #define tLOG_EQ 22
120 #define tLOG_NOT_EQ 23
121 #define tLESS 24
122 #define tLESS_EQ 25
123 #define tGREATER 26
124 #define tGREATER_EQ 27
125 #define tBIT_AND 28
126 #define tBIT_OR 29
127 #define tLOG_AND 30
128 #define tLOG_OR 31
129 #define tSTRING 32
130 #define tQUESTION 33
131 #define tBIT_NOT 34
132 #define tWSPACE 35
133 #define tCOLON 36
134 #define tCOLONCOLON 37
135
136 #endif /* !_DDB_DB_LEX_H_ */
137