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/*
** $Id: ldebug.c,v 1.19 2000/05/12 19:49:18 roberto Exp roberto $
** Debug Interface
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#define LUA_REENTRANT
#include "lapi.h"
#include "lauxlib.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lobject.h"
#include "lstate.h"
#include "ltable.h"
#include "ltm.h"
#include "lua.h"
#include "luadebug.h"
static const lua_Type normtype[] = { /* ORDER LUA_T */
TAG_USERDATA, TAG_NUMBER, TAG_STRING, TAG_TABLE,
TAG_LCLOSURE, TAG_CCLOSURE, TAG_NIL,
TAG_LCLOSURE, TAG_CCLOSURE /* TAG_LMARK, TAG_CMARK */
};
static void setnormalized (TObject *d, const TObject *s) {
d->value = s->value;
d->ttype = normtype[ttype(s)];
}
static int hasdebuginfo (lua_State *L, StkId f) {
return (f+1 < L->top && (f+1)->ttype == TAG_LINE);
}
lua_Hook lua_setcallhook (lua_State *L, lua_Hook func) {
lua_Hook oldhook = L->callhook;
L->callhook = func;
return oldhook;
}
lua_Hook lua_setlinehook (lua_State *L, lua_Hook func) {
lua_Hook oldhook = L->linehook;
L->linehook = func;
return oldhook;
}
int lua_setdebug (lua_State *L, int debug) {
int old = L->debug;
L->debug = debug;
return old;
}
static StkId 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 NULL;
}
int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
StkId f = aux_stackedfunction(L, level, L->top);
if (f == NULL) return 0; /* there is no such level */
else {
ar->_func = f;
return 1;
}
}
static int lua_nups (StkId f) {
switch (ttype(f)) {
case TAG_LCLOSURE: case TAG_CCLOSURE:
case TAG_LMARK: case TAG_CMARK:
return f->value.cl->nelems;
default:
return 0;
}
}
static int lua_currentline (lua_State *L, StkId f) {
return hasdebuginfo(L, f) ? (f+1)->value.i : -1;
}
static Proto *getluaproto (StkId f) {
return (ttype(f) == TAG_LMARK) ? clvalue(f)->f.l : NULL;
}
int lua_getlocal (lua_State *L, const lua_Debug *ar, lua_Localvar *v) {
StkId f = ar->_func;
Proto *fp = getluaproto(f);
if (!fp) return 0; /* `f' is not a Lua function? */
v->name = luaF_getlocalname(fp, v->index, lua_currentline(L, f));
if (!v->name) return 0;
/* if `name', there must be a TAG_LINE */
/* therefore, f+2 points to function base */
LUA_ASSERT(L, ttype(f+1) == TAG_LINE, "");
v->value = luaA_putluaObject(L, (f+2)+(v->index-1));
return 1;
}
int lua_setlocal (lua_State *L, const lua_Debug *ar, lua_Localvar *v) {
StkId f = ar->_func;
Proto *fp = getluaproto(f);
if (!fp) return 0; /* `f' is not a Lua function? */
v->name = luaF_getlocalname(fp, v->index, lua_currentline(L, f));
if (!v->name || v->name[0] == '*') return 0; /* `*' starts private locals */
LUA_ASSERT(L, ttype(f+1) == TAG_LINE, "");
*((f+2)+(v->index-1)) = *v->value;
return 1;
}
static void lua_funcinfo (lua_Debug *ar, StkId func) {
switch (ttype(func)) {
case TAG_LCLOSURE: case TAG_LMARK:
ar->source = clvalue(func)->f.l->source->str;
ar->linedefined = clvalue(func)->f.l->lineDefined;
ar->what = "Lua";
break;
case TAG_CCLOSURE: case TAG_CMARK:
ar->source = "(C)";
ar->linedefined = -1;
ar->what = "C";
break;
default:
LUA_INTERNALERROR(L, "invalid `func' value");
}
if (ar->linedefined == 0)
ar->what = "main";
}
static int checkfunc (lua_State *L, TObject *o) {
return luaO_equalObj(o, L->top);
}
static void lua_getobjname (lua_State *L, StkId f, lua_Debug *ar) {
Hash *g = L->gt;
int i;
/* try to find a name for given function */
setnormalized(L->top, f); /* to be used by `checkfunc' */
for (i=0; i<=g->size; i++) {
if (ttype(key(node(g,i))) == TAG_STRING && checkfunc(L, val(node(g,i)))) {
ar->name = tsvalue(key(node(g,i)))->str;
ar->namewhat = "global";
return;
}
}
/* not found: try tag methods */
if ((ar->name = luaT_travtagmethods(L, checkfunc)) != NULL)
ar->namewhat = "tag-method";
else ar->namewhat = ""; /* not found at all */
}
int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
StkId func;
if (*what != '>')
func = ar->_func;
else {
what++; /* skip the '>' */
func = ar->func;
}
for (; *what; what++) {
switch (*what) {
case 'S':
lua_funcinfo(ar, func);
break;
case 'l':
ar->currentline = lua_currentline(L, func);
break;
case 'u':
ar->nups = lua_nups(func);
break;
case 'n':
lua_getobjname(L, func, ar);
break;
case 'f':
setnormalized(L->top, func);
incr_top;
ar->func = lua_pop(L);
break;
default: return 0; /* invalid option */
}
}
return 1;
}
static void call_index_error (lua_State *L, TObject *o, const char *v) {
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, "call");
}
void luaG_indexerror (lua_State *L, TObject *t) {
call_index_error(L, t, "index");
}
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