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
|
/*
** $Id: lfunc.c,v 1.3 2001/11/26 23:00:23 darkgod Exp $
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#include "lua.h"
#include "lfunc.h"
#include "lmem.h"
#include "lstate.h"
#define sizeclosure(n) ((int)sizeof(Closure) + (int)sizeof(TObject)*((n)-1))
Closure *luaF_newclosure (lua_State *L, int nelems) {
int size = sizeclosure(nelems);
Closure *c = (Closure *)luaM_malloc(L, size);
c->next = L->rootcl;
L->rootcl = c;
c->mark = c;
c->nupvalues = nelems;
L->nblocks += size;
return c;
}
Proto *luaF_newproto (lua_State *L) {
Proto *f = luaM_new(L, Proto);
f->knum = NULL;
f->nknum = 0;
f->kstr = NULL;
f->nkstr = 0;
f->kproto = NULL;
f->nkproto = 0;
f->code = NULL;
f->ncode = 0;
f->numparams = 0;
f->is_vararg = 0;
f->maxstacksize = 0;
f->marked = 0;
f->lineinfo = NULL;
f->nlineinfo = 0;
f->nlocvars = 0;
f->locvars = NULL;
f->lineDefined = 0;
f->source = NULL;
f->next = L->rootproto; /* chain in list of protos */
L->rootproto = f;
return f;
}
static size_t protosize (Proto *f) {
return sizeof(Proto)
+ f->nknum*sizeof(Number)
+ f->nkstr*sizeof(TString *)
+ f->nkproto*sizeof(Proto *)
+ f->ncode*sizeof(Instruction)
+ f->nlocvars*sizeof(struct LocVar)
+ f->nlineinfo*sizeof(int);
}
void luaF_protook (lua_State *L, Proto *f, int pc) {
f->ncode = pc; /* signal that proto was properly created */
L->nblocks += protosize(f);
}
void luaF_freeproto (lua_State *L, Proto *f) {
if (f->ncode > 0) /* function was properly created? */
L->nblocks -= protosize(f);
luaM_free(L, f->code);
luaM_free(L, f->locvars);
luaM_free(L, f->kstr);
luaM_free(L, f->knum);
luaM_free(L, f->kproto);
luaM_free(L, f->lineinfo);
luaM_free(L, f);
}
void luaF_freeclosure (lua_State *L, Closure *c) {
L->nblocks -= sizeclosure(c->nupvalues);
luaM_free(L, c);
}
/*
** Look for n-th local variable at line `line' in function `func'.
** Returns NULL if not found.
*/
const char *luaF_getlocalname (const Proto *f, int local_number, int pc) {
int i;
for (i = 0; i<f->nlocvars && f->locvars[i].startpc <= pc; i++) {
if (pc < f->locvars[i].endpc) { /* is variable active? */
local_number--;
if (local_number == 0)
return f->locvars[i].varname->str;
}
}
return NULL; /* not found */
}
|
