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/*
** fallback.c
** TecCGraf - PUC-Rio
*/
char *rcs_fallback="$Id: fallback.c,v 1.16 1995/10/17 11:52:38 roberto Exp roberto $";
#include <stdio.h>
#include <string.h>
#include "mem.h"
#include "fallback.h"
#include "opcode.h"
#include "lua.h"
static void errorFB (void);
static void indexFB (void);
static void gettableFB (void);
static void arithFB (void);
static void concatFB (void);
static void orderFB (void);
static void GDFB (void);
static void funcFB (void);
/*
** Warning: This list must be in the same order as the #define's
*/
struct FB luaI_fallBacks[] = {
{"error", {LUA_T_CFUNCTION, {errorFB}}, 1, 0},
{"index", {LUA_T_CFUNCTION, {indexFB}}, 2, 1},
{"gettable", {LUA_T_CFUNCTION, {gettableFB}}, 2, 1},
{"arith", {LUA_T_CFUNCTION, {arithFB}}, 3, 1},
{"order", {LUA_T_CFUNCTION, {orderFB}}, 3, 1},
{"concat", {LUA_T_CFUNCTION, {concatFB}}, 2, 1},
{"settable", {LUA_T_CFUNCTION, {gettableFB}}, 3, 0},
{"gc", {LUA_T_CFUNCTION, {GDFB}}, 1, 0},
{"function", {LUA_T_CFUNCTION, {funcFB}}, -1, -1}
/* no fixed number of params or results */
};
#define N_FB (sizeof(luaI_fallBacks)/sizeof(struct FB))
void luaI_setfallback (void)
{
int i;
char *name = lua_getstring(lua_getparam(1));
lua_Object func = lua_getparam(2);
if (name == NULL || !(lua_isfunction(func) || lua_iscfunction(func)))
lua_error("incorrect argument to function `setfallback'");
for (i=0; i<N_FB; i++)
{
if (strcmp(luaI_fallBacks[i].kind, name) == 0)
{
luaI_pushobject(&luaI_fallBacks[i].function);
luaI_fallBacks[i].function = *luaI_Address(func);
return;
}
}
/* name not found */
lua_error("incorrect argument to function `setfallback'");
}
static void errorFB (void)
{
lua_Object o = lua_getparam(1);
if (lua_isstring(o))
fprintf (stderr, "lua: %s\n", lua_getstring(o));
else
fprintf(stderr, "lua: unknown error\n");
}
static void indexFB (void)
{
lua_pushnil();
}
static void gettableFB (void)
{
lua_error("indexed expression not a table");
}
static void arithFB (void)
{
lua_error("unexpected type at conversion to number");
}
static void concatFB (void)
{
lua_error("unexpected type at conversion to string");
}
static void orderFB (void)
{
lua_error("unexpected type at comparison");
}
static void GDFB (void) { }
static void funcFB (void)
{
lua_error("call expression not a function");
}
/*
** Lock routines
*/
static Object *lockArray = NULL;
static Word lockSize = 0;
int luaI_lock (Object *object)
{
Word i;
Word oldSize;
if (tag(object) == LUA_T_NIL)
return -1;
for (i=0; i<lockSize; i++)
if (tag(&lockArray[i]) == LUA_T_NIL)
{
lockArray[i] = *object;
return i;
}
/* no more empty spaces */
oldSize = lockSize;
if (lockArray == NULL)
{
lockSize = 10;
lockArray = newvector(lockSize, Object);
}
else
{
lockSize = 3*oldSize/2 + 5;
lockArray = growvector(lockArray, lockSize, Object);
}
for (i=oldSize; i<lockSize; i++)
tag(&lockArray[i]) = LUA_T_NIL;
lockArray[oldSize] = *object;
return oldSize;
}
void lua_unlock (int ref)
{
tag(&lockArray[ref]) = LUA_T_NIL;
}
Object *luaI_getlocked (int ref)
{
return &lockArray[ref];
}
void luaI_travlock (int (*fn)(Object *))
{
Word i;
for (i=0; i<lockSize; i++)
fn(&lockArray[i]);
}
char *luaI_travfallbacks (int (*fn)(Object *))
{
Word i;
for (i=0; i<N_FB; i++)
if (fn(&luaI_fallBacks[i].function))
return luaI_fallBacks[i].kind;
return NULL;
}
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