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616915dd | 1 | /* |
11db3170 | 2 | ** Splint - annotation-assisted static program checker |
77d37419 | 3 | ** Copyright (C) 1994-2002 University of Virginia, |
616915dd | 4 | ** Massachusetts Institute of Technology |
5 | ** | |
6 | ** This program is free software; you can redistribute it and/or modify it | |
7 | ** under the terms of the GNU General Public License as published by the | |
8 | ** Free Software Foundation; either version 2 of the License, or (at your | |
9 | ** option) any later version. | |
10 | ** | |
11 | ** This program is distributed in the hope that it will be useful, but | |
12 | ** WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | ** General Public License for more details. | |
15 | ** | |
16 | ** The GNU General Public License is available from http://www.gnu.org/ or | |
17 | ** the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
18 | ** MA 02111-1307, USA. | |
19 | ** | |
155af98d | 20 | ** For information on splint: info@splint.org |
21 | ** To report a bug: splint-bug@splint.org | |
11db3170 | 22 | ** For more information: http://www.splint.org |
616915dd | 23 | */ |
24 | ||
25 | /* | |
26 | ** shift.c | |
27 | ** | |
28 | ** Larch shift sequence manager | |
29 | ** | |
30 | ** Tokens are sent by the parser to this module. Here they are saved | |
31 | ** for awhile in a stack, and delivered on demand during reduce actions. | |
32 | ** The coordination between what the parser sends here and what reduce | |
33 | ** consumes here must be maintained by the programmer. | |
34 | ** | |
35 | */ | |
36 | ||
1b8ae690 | 37 | # include "splintMacros.nf" |
616915dd | 38 | # include "llbasic.h" |
39 | # include "shift.h" | |
40 | ||
3be9a165 | 41 | /*@constant static int SHIFTMAX=200;@*/ |
616915dd | 42 | # define SHIFTMAX 200 |
43 | ||
44 | static o_ltoken Shifts[SHIFTMAX]; | |
45 | static int shiftIndex; | |
46 | ||
47 | static bool Parsing_LSLinit = TRUE; | |
48 | ||
49 | static bool | |
50 | LSLGenIsEmptyShiftStack (void) | |
51 | { | |
52 | return (shiftIndex == 0); | |
53 | } | |
54 | ||
55 | void LSLGenShift (ltoken tok) | |
56 | { | |
57 | if (shiftIndex < SHIFTMAX) | |
58 | { | |
59 | Shifts[shiftIndex] = ltoken_copy (tok); | |
60 | shiftIndex++; | |
61 | } | |
62 | else | |
63 | { | |
64 | llbuglit ("LSLGenShift: needs MoreMem ()"); | |
65 | } | |
66 | } | |
67 | ||
68 | extern void | |
69 | LSLGenShiftOnly (/*@only@*/ ltoken tok) | |
70 | { | |
71 | if (shiftIndex < SHIFTMAX) | |
72 | { | |
73 | Shifts[shiftIndex] = tok; | |
74 | shiftIndex++; | |
75 | } | |
76 | else | |
77 | { | |
78 | llbugexitlit ("LSLGenShift: needs MoreMem ()"); | |
79 | } | |
80 | } | |
81 | ||
82 | extern ltoken | |
83 | LSLGenTopPopShiftStack (void) | |
84 | { | |
3120b462 | 85 | ltoken res; |
86 | ||
616915dd | 87 | if (LSLGenIsEmptyShiftStack ()) |
88 | { | |
89 | lclfatalbug ("LSLGenTopPopShiftStack: Empty stack"); | |
90 | } | |
91 | ||
3120b462 | 92 | res = Shifts[--shiftIndex]; |
93 | Shifts[shiftIndex] = ltoken_undefined; | |
94 | /*@-retalias@*/ /*@-dependenttrans@*/ | |
95 | return res; | |
96 | /*@=retalias@*/ /*@=dependenttrans@*/ | |
616915dd | 97 | } |
98 | ||
99 | void | |
100 | LSLGenInit (bool LSLParse) | |
101 | { | |
102 | Parsing_LSLinit = LSLParse; | |
103 | } | |
104 |