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/*
** $Id: ldebug.c,v 1.2 1999/12/23 18:19:57 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;
}
lua_Function lua_stackedfunction (lua_State *L, int level) {
int i;
for (i = (L->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;
}
const char *luaG_getname (lua_State *L, const char **name) {
lua_Function f = lua_stackedfunction(L, 0);
if (f == LUA_NOOBJECT || !hasdebuginfo(L, f) || ttype(f+2) == LUA_T_NIL)
return NULL; /* 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;
switch (ttype(f+2)) {
case LUA_T_NGLOBAL: return "global";
case LUA_T_NLOCAL: return "local";
case LUA_T_NDOT: return "field";
default:
LUA_INTERNALERROR(L, "invalid tag for NAME");
return NULL; /* unreacheable; to avoid warnings */
}
}
}
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) {
/* try to find a name for given function */
GlobalVar *g;
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);
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");
}
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