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
|
/*
** $Id: ldebug.c,v 1.3 1999/12/29 16:31:15 roberto Exp roberto $
** Debug Interface
** See Copyright Notice in lua.h
*/
#define LUA_REENTRANT
#include "lapi.h"
#include "lauxlib.h"
#include "ldebug.h"
#include "lfunc.h"
#include "lobject.h"
#include "lstate.h"
#include "ltable.h"
#include "ltm.h"
#include "lua.h"
#include "luadebug.h"
static int hasdebuginfo (lua_State *L, lua_Function f) {
return (f+1 < L->top && (f+1)->ttype == LUA_T_LINE);
}
lua_LHFunction lua_setlinehook (lua_State *L, lua_LHFunction func) {
lua_LHFunction old = L->linehook;
L->linehook = func;
return old;
}
lua_CHFunction lua_setcallhook (lua_State *L, lua_CHFunction func) {
lua_CHFunction old = L->callhook;
L->callhook = func;
return old;
}
int lua_setdebug (lua_State *L, int debug) {
int old = L->debug;
L->debug = debug;
return old;
}
static lua_Function aux_stackedfunction (lua_State *L, int level, StkId top) {
int i;
for (i = (top-1)-L->stack; i>=0; i--) {
if (is_T_MARK(L->stack[i].ttype)) {
if (level == 0)
return L->stack+i;
level--;
}
}
return LUA_NOOBJECT;
}
lua_Function lua_stackedfunction (lua_State *L, int level) {
return aux_stackedfunction(L, level, L->top);
}
static const char *luaG_getname (lua_State *L, const char **name, StkId top) {
lua_Function f = aux_stackedfunction(L, 0, top);
if (f == LUA_NOOBJECT || !hasdebuginfo(L, f) || ttype(f+2) == LUA_T_NIL)
return ""; /* no name available */
else {
int i = (f+2)->value.i;
if (ttype(f) == LUA_T_LCLMARK)
f = protovalue(f);
LUA_ASSERT(L, ttype(f) == LUA_T_LMARK, "must be a Lua function");
LUA_ASSERT(L, ttype(&tfvalue(f)->consts[i]) == LUA_T_STRING, "");
*name = tsvalue(&tfvalue(f)->consts[i])->str;
return luaO_typename(f+2);
}
}
int lua_nups (lua_State *L, lua_Function f) {
UNUSED(L);
switch (luaA_normalizedtype(f)) {
case LUA_T_LCLOSURE: case LUA_T_CCLOSURE:
return f->value.cl->nelems;
default:
return 0;
}
}
int lua_currentline (lua_State *L, lua_Function f) {
return hasdebuginfo(L, f) ? (f+1)->value.i : -1;
}
lua_Object lua_getlocal (lua_State *L, lua_Function f, int local_number,
const char **name) {
/* check whether `f' is a Lua function */
if (lua_tag(L, f) != LUA_T_LPROTO)
return LUA_NOOBJECT;
else {
TProtoFunc *fp = luaA_protovalue(f)->value.tf;
*name = luaF_getlocalname(fp, local_number, lua_currentline(L, f));
if (*name) {
/* if "*name", there must be a LUA_T_LINE and a NAME */
/* therefore, f+3 points to function base */
LUA_ASSERT(L, ttype(f+1) == LUA_T_LINE, "");
return luaA_putluaObject(L, (f+3)+(local_number-1));
}
else
return LUA_NOOBJECT;
}
}
int lua_setlocal (lua_State *L, lua_Function f, int local_number) {
/* check whether `f' is a Lua function */
if (lua_tag(L, f) != LUA_T_LPROTO)
return 0;
else {
TProtoFunc *fp = luaA_protovalue(f)->value.tf;
const char *name = luaF_getlocalname(fp, local_number,
lua_currentline(L, f));
luaA_checkCparams(L, 1);
--L->top;
if (name) {
LUA_ASSERT(L, ttype(f+1) == LUA_T_LINE, "");
*((f+3)+(local_number-1)) = *L->top;
return 1;
}
else
return 0;
}
}
void lua_funcinfo (lua_State *L, lua_Object func,
const char **source, int *linedefined) {
if (!lua_isfunction(L, func))
lua_error(L, "API error - `funcinfo' called with a non-function value");
else {
const TObject *f = luaA_protovalue(func);
if (luaA_normalizedtype(f) == LUA_T_LPROTO) {
*source = tfvalue(f)->source->str;
*linedefined = tfvalue(f)->lineDefined;
}
else {
*source = "(C)";
*linedefined = -1;
}
}
}
static int checkfunc (lua_State *L, TObject *o) {
return luaO_equalObj(o, L->top);
}
const char *lua_getobjname (lua_State *L, lua_Object o, const char **name) {
GlobalVar *g;
if (is_T_MARK(ttype(o))) { /* `o' is an active function? */
/* look for caller debug information */
const char *kind = luaG_getname(L, name, o);
if (*kind) return kind;
/* else go through */
}
/* try to find a name for given function */
luaA_setnormalized(L->top, o); /* to be used by `checkfunc' */
for (g=L->rootglobal; g; g=g->next) {
if (checkfunc(L, &g->value)) {
*name = g->name->str;
return "global";
}
}
/* not found: try tag methods */
if ((*name = luaT_travtagmethods(L, checkfunc)) != NULL)
return "tag-method";
else return ""; /* not found at all */
}
static void call_index_error (lua_State *L, TObject *o, const char *tp,
const char *v) {
const char *name;
const char *kind = luaG_getname(L, &name, L->top);
if (*kind) { /* is there a name? */
luaL_verror(L, "%.10s `%.30s' is not a %.10s", kind, name, tp);
}
else {
luaL_verror(L, "attempt to %.10s a %.10s value", v, lua_type(L, o));
}
}
void luaG_callerror (lua_State *L, TObject *func) {
call_index_error(L, func, "function", "call");
}
void luaG_indexerror (lua_State *L, TObject *t) {
call_index_error(L, t, "table", "index");
}
|
