blob: e10ee7a99fbc539f1fa43e9aa970454da1954ff1 (
plain) (
blame)
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
|
#include <u.h>
#include <libc.h>
#include <bio.h>
#include "apl9.h"
Symtab *globalsymtab;
DfnFrame *currentdfn;
Symtab *newsymtab(void);
void freesymtab(Symtab *);
Symbol *
getsym(Rune *name, int fresh)
{
DfnFrame *dfn = currentdfn;
Symtab *tab;
int done = 0;
do{
if(dfn != nil)
tab = dfn->symtab;
else
tab = globalsymtab;
for(int i = 0; i < tab->nsyms; i++)
if(runestrcmp(tab->syms[i]->name, name) == 0)
return tab->syms[i];
if(dfn)
dfn = dfn->prev;
else
done = 1;
}while(!done && !fresh);
tab->nsyms++;
tab->syms = realloc(tab->syms, sizeof(Symbol *) * tab->nsyms);
tab->syms[tab->nsyms-1] = emalloc(sizeof(Symbol));
tab->syms[tab->nsyms-1]->name = runestrdup(name);
tab->syms[tab->nsyms-1]->undefined = 1;
tab->syms[tab->nsyms-1]->getfn = nil;
tab->syms[tab->nsyms-1]->setfn = nil;
return tab->syms[tab->nsyms-1];
}
Symtab *
newsymtab(void)
{
Symtab *tab = emalloc(sizeof(Symtab));
tab->nsyms = 0;
tab->syms = nil;
tab->io = globalIO();
tab->div = globalDIV();
return tab;
}
void
freesymtab(Symtab *tab)
{
int i;
for(i = 0; i < tab->nsyms; i++){
Symbol *s = tab->syms[i];
if(s->undefined == 0 && s->value.tag == ArrayTag)
freearray(s->value.array);
}
free(tab->syms);
free(tab);
}
void
initsymtab(void)
{
globalsymtab = newsymtab();
}
DfnFrame *
getcurrentdfn(void)
{
return currentdfn;
}
DfnFrame *
pushdfnframe(Rune *code)
{
DfnFrame *new = malloc(sizeof(DfnFrame));
new->code = code;
new->symtab = newsymtab();
new->prev = currentdfn;
currentdfn = new;
return new;
}
void
popdfnframe(void)
{
if(currentdfn != nil){
DfnFrame *prev = currentdfn->prev;
freesymtab(currentdfn->symtab);
free(currentdfn);
currentdfn = prev;
}
}
vlong
globalIO(void)
{
if(currentdfn)
return currentdfn->symtab->io;
else if(globalsymtab)
return globalsymtab->io;
else
return 1;
}
void
globalIOset(vlong io)
{
if(currentdfn)
currentdfn->symtab->io = io;
else
globalsymtab->io = io;
}
int
globalDIV(void)
{
if(currentdfn)
return currentdfn->symtab->div;
else if(globalsymtab)
return globalsymtab->div;
else
return 0;
}
void
globalDIVset(int div)
{
if(currentdfn)
currentdfn->symtab->div = div;
else
globalsymtab->div = div;
}
|