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
|
/*
** $Id: lfunc.c,v 1.1 2003/10/10 16:15:45 graydon Exp $
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#define lfunc_c
#include "lua.h"
#include "lfunc.h"
#include "lgc.h"
#include "lmem.h"
#include "lobject.h"
#include "lstate.h"
#define sizeCclosure(n) (cast(int, sizeof(CClosure)) + \
cast(int, sizeof(TObject)*((n)-1)))
#define sizeLclosure(n) (cast(int, sizeof(LClosure)) + \
cast(int, sizeof(TObject *)*((n)-1)))
Closure *luaF_newCclosure (lua_State *L, int nelems) {
Closure *c = cast(Closure *, luaM_malloc(L, sizeCclosure(nelems)));
luaC_link(L, valtogco(c), LUA_TFUNCTION);
c->c.isC = 1;
c->c.nupvalues = cast(lu_byte, nelems);
return c;
}
Closure *luaF_newLclosure (lua_State *L, int nelems, TObject *e) {
Closure *c = cast(Closure *, luaM_malloc(L, sizeLclosure(nelems)));
luaC_link(L, valtogco(c), LUA_TFUNCTION);
c->l.isC = 0;
c->l.g = *e;
c->l.nupvalues = cast(lu_byte, nelems);
return c;
}
UpVal *luaF_findupval (lua_State *L, StkId level) {
GCObject **pp = &L->openupval;
UpVal *p;
UpVal *v;
while ((p = ngcotouv(*pp)) != NULL && p->v >= level) {
if (p->v == level) return p;
pp = &p->next;
}
v = luaM_new(L, UpVal); /* not found: create a new one */
v->tt = LUA_TUPVAL;
v->marked = 1; /* open upvalues should not be collected */
v->v = level; /* current value lives in the stack */
v->next = *pp; /* chain it in the proper position */
*pp = valtogco(v);
return v;
}
void luaF_close (lua_State *L, StkId level) {
UpVal *p;
while ((p = ngcotouv(L->openupval)) != NULL && p->v >= level) {
setobj(&p->value, p->v); /* save current value (write barrier) */
p->v = &p->value; /* now current value lives here */
L->openupval = p->next; /* remove from `open' list */
luaC_link(L, valtogco(p), LUA_TUPVAL);
}
}
Proto *luaF_newproto (lua_State *L) {
Proto *f = luaM_new(L, Proto);
luaC_link(L, valtogco(f), LUA_TPROTO);
f->k = NULL;
f->sizek = 0;
f->p = NULL;
f->sizep = 0;
f->code = NULL;
f->sizecode = 0;
f->sizelineinfo = 0;
f->sizeupvalues = 0;
f->nups = 0;
f->upvalues = NULL;
f->numparams = 0;
f->is_vararg = 0;
f->maxstacksize = 0;
f->lineinfo = NULL;
f->sizelocvars = 0;
f->locvars = NULL;
f->lineDefined = 0;
f->source = NULL;
return f;
}
void luaF_freeproto (lua_State *L, Proto *f) {
luaM_freearray(L, f->code, f->sizecode, Instruction);
luaM_freearray(L, f->p, f->sizep, Proto *);
luaM_freearray(L, f->k, f->sizek, TObject);
luaM_freearray(L, f->lineinfo, f->sizelineinfo, int);
luaM_freearray(L, f->locvars, f->sizelocvars, struct LocVar);
luaM_freearray(L, f->upvalues, f->sizeupvalues, TString *);
luaM_freelem(L, f);
}
void luaF_freeclosure (lua_State *L, Closure *c) {
int size = (c->c.isC) ? sizeCclosure(c->c.nupvalues) :
sizeLclosure(c->l.nupvalues);
luaM_free(L, c, size);
}
/*
** 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->sizelocvars && f->locvars[i].startpc <= pc; i++) {
if (pc < f->locvars[i].endpc) { /* is variable active? */
local_number--;
if (local_number == 0)
return getstr(f->locvars[i].varname);
}
}
return NULL; /* not found */
}
|
