-
Notifications
You must be signed in to change notification settings - Fork 0
/
id.c
217 lines (169 loc) · 4.12 KB
/
id.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
/* Manage the assembler symbol table */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "as6502.h"
#include "id.h"
#include "jos.h"
#include "obj65.h"
#include "utils.h"
extern FILE *listfile;
extern int pass;
#define ITEMS_PER_SEGMENT (50)
#define ID ((struct item *)id)
struct extreq {
word at_lc;
struct extreq *next;
};
struct item {
char id[IDLEN];
long value;
int flags;
boolean assigned;
struct extreq *root;
};
struct segment {
int nrofitems;
struct item item[ITEMS_PER_SEGMENT];
struct segment *next;
};
PRIVATE struct segment *root = NULL;
PRIVATE struct segment *newseg() {
struct segment *work = GETCORE(struct segment);
if (work == NULL)
fatal("Can't enlarge symbol table");
work->nrofitems = 0;
work->next = NULL;
return work;
}
PRIVATE void findid(const char *id, struct segment **seg, struct item **item) {
struct segment *work = root;
struct segment *last = NULL;
int i;
while (work != NULL) {
last = work;
for (i = 0; i < work->nrofitems; i++)
if (strcmp(id, work->item[i].id) == 0) {
*seg = work;
*item = &work->item[i];
return;
}
work = work->next;
}
*seg = last;
*item = NULL;
}
PRIVATE struct item *addid(const char *id, struct segment *seg) {
struct item *it;
if (seg == NULL)
seg = root = newseg();
if (seg->nrofitems >= ITEMS_PER_SEGMENT) {
seg->next = newseg();
seg = seg->next;
}
it = &seg->item[seg->nrofitems];
strcpy(it->id, id);
it->value = (long)0xFFFF;
it->flags = 0;
it->assigned = FALSE;
it->root = NULL;
seg->nrofitems++;
return it;
}
PUBLIC void setflags(void *id, int flags) {
ID->flags |= flags;
if (ID->flags & PUBLICSYM && ID->flags & EXTERNALSYM) {
error("Attempted assignment of conflicting attributes to symbol %s",
ID->id);
ID->flags = 0;
}
}
PUBLIC void setvalue(void *id, long value) {
if (ID->flags & EXTERNALSYM)
error("Cannot assign a value to external symbol %s", ID->id);
else {
ID->value = value;
ID->assigned = TRUE;
}
}
PRIVATE void defined_id(struct item *id) {
if (pass == 1)
return;
if (!id->assigned && !(id->flags & EXTERNALSYM)) {
error("Unknown symbol %s", id->id);
id->assigned = TRUE;
}
}
PUBLIC long getvalue(void *id) {
defined_id(id);
return ID->value;
}
PUBLIC int getflags(void *id) {
defined_id(id);
return ID->flags;
}
PUBLIC void dumptable() {
struct segment *work = root;
int i;
if (!listfile)
return;
fputs("\nDump of symbol table:\n", listfile);
work = root;
while (work != NULL) {
for (i = 0; i < work->nrofitems; i++)
fprintf(listfile, "%-32s = %08lX\n", work->item[i].id,
work->item[i].value);
work = work->next;
}
}
PUBLIC void *getid(const char *id) {
struct segment *seg;
struct item *item;
findid(id, &seg, &item);
if (item == NULL)
item = addid(id, seg);
return item;
}
PUBLIC void external_req(void *id, word at_lc) {
struct extreq *work;
if (pass == 1)
return;
work = GETCORE(struct extreq);
work->at_lc = at_lc;
work->next = ID->root;
ID->root = work;
}
PUBLIC void writeid(int objfile) {
struct segment *work = root;
struct item *ip;
int i;
struct extreq *req;
struct obj65rec orec;
work = root;
while (work != NULL) {
for (i = 0; i < work->nrofitems; i++) {
ip = &work->item[i];
if (ip->flags & STARTSYM) {
orec.type = STARTREC;
orec.rec.at_lc = ip->value;
write(objfile, &orec, sizeof(orec.rec.at_lc) + sizeof(orec.type));
} else if (ip->flags & PUBLICSYM) {
orec.type = PUBLICREC;
strcpy(orec.rec.sym.id, ip->id);
orec.rec.sym.at_lc = ip->value;
write(objfile, &orec, sizeof(orec.rec.sym) + sizeof(orec.type));
} else if (ip->flags & EXTERNALSYM) {
orec.type = EXTREQREC;
strcpy(orec.rec.sym.id, ip->id);
req = ip->root;
while (req) {
orec.rec.sym.at_lc = req->at_lc;
write(objfile, &orec, sizeof(orec.rec.sym) + sizeof(orec.type));
req = req->next;
}
}
}
work = work->next;
}
}