/*
** check whether list has any jump that do not produce a value
** (or produce an inverted value)
*/
static int need_value (FuncState *fs, int list, int cond) {
for (; list != NO_JUMP; list = luaK_getjump(fs, list)) {
Instruction i = *getjumpcontrol(fs, list);
if (GET_OPCODE(i) != OP_TEST || GETARG_C(i) != cond) return 1;
}
return 0; /* not found */
}
void luaK_concat (FuncState *fs, int *l1, int l2) {
if (l2 == NO_JUMP) return;
else if (*l1 == NO_JUMP)
*l1 = l2;
else {
int list = *l1;
int next;
while ((next = luaK_getjump(fs, list)) != NO_JUMP) /* find last element */
list = next;
luaK_fixjump(fs, list, l2);
}
}
void luaK_concat (FuncState *fs, int *l1, int l2) {
if (*l1 == NO_JUMP)
*l1 = l2;
else {
int list = *l1;
for (;;) { /* traverse `l1' */
int next = luaK_getjump(fs, list);
if (next == NO_JUMP) { /* end of list? */
luaK_fixjump(fs, list, l2);
return;
}
list = next;
}
}
}
static void luaK_patchlistaux (FuncState *fs, int list, int target,
OpCode special, int special_target) {
Instruction *code = fs->f->code;
while (list != NO_JUMP) {
int next = luaK_getjump(fs, list);
Instruction *i = &code[list];
OpCode op = GET_OPCODE(*i);
if (op == special) /* this `op' already has a value */
luaK_fixjump(fs, list, special_target);
else {
luaK_fixjump(fs, list, target); /* do the patch */
if (op == OP_JMPONT) /* remove eventual values */
SET_OPCODE(*i, OP_JMPT);
else if (op == OP_JMPONF)
SET_OPCODE(*i, OP_JMPF);
}
list = next;
}
}
static void luaK_patchlistaux (FuncState *fs, int list,
int ttarget, int treg, int ftarget, int freg, int dtarget) {
while (list != NO_JUMP) {
int next = luaK_getjump(fs, list);
Instruction *i = getjumpcontrol(fs, list);
if (GET_OPCODE(*i) != OP_TEST) {
lua_assert(dtarget != NO_JUMP);
luaK_fixjump(fs, list, dtarget); /* jump to default target */
}
else {
if (GETARG_C(*i)) {
lua_assert(ttarget != NO_JUMP);
patchtestreg(i, treg);
luaK_fixjump(fs, list, ttarget);
}
else {
lua_assert(ftarget != NO_JUMP);
patchtestreg(i, freg);
luaK_fixjump(fs, list, ftarget);
}
}
list = next;
}
}
static int need_value (FuncState *fs, int list, OpCode hasvalue) {
/* check whether list has a jump without a value */
for (; list != NO_JUMP; list = luaK_getjump(fs, list))
if (GET_OPCODE(fs->f->code[list]) != hasvalue) return 1;
return 0; /* not found */
}