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#include "boolexpr.h"
struct boolexpr *boolexpr_eql(struct symlist *sl, struct symbol *sym1,
struct symbol *sym2);
struct boolexpr *boolexpr_kconfig(struct symlist *sl, struct expr *expr,
bool modulesym) {
struct stck {
struct expr *expr;
struct boolexpr *bl;
};
struct expr **back;
int back_size = 2, back_pos = -1;
back = malloc((unsigned) back_size * sizeof(struct expr *));
struct stck *stack;
unsigned stack_size = 2;
int stack_pos = -1;
stack = malloc((unsigned) stack_size * sizeof(struct stck));
struct boolexpr *rtn = NULL;
while (expr != NULL) {
if ((back_pos >= 0 && back[back_pos] != expr) || back_pos < 0) {
if (++back_pos >= back_size) {
back_size *= 2;
back =
realloc(back,
(unsigned) back_size * sizeof(struct expr *));
}
back[back_pos] = expr;
}
switch (expr->type) {
case E_SYMBOL:
rtn = boolexpr_sym(sl, expr->left.sym, modulesym);
goto go_up;
case E_NOT:
if (rtn == NULL)
expr = expr->left.expr;
else {
rtn = boolexpr_not(rtn);
goto go_up;
}
break;
case E_OR:
case E_AND:
if (stack_pos < 0 || stack[stack_pos].expr != expr) {
if (rtn == NULL)
expr = expr->left.expr;
else {
if (++stack_pos >= stack_size) {
stack_size *= 2;
stack =
realloc(stack,
stack_size * sizeof(struct stck));
}
stack[stack_pos].expr = expr;
stack[stack_pos].bl = rtn;
expr = expr->right.expr;
rtn = NULL;
}
} else {
if (expr->type == E_OR)
rtn = boolexpr_or(stack[stack_pos].bl, rtn);
else
rtn = boolexpr_and(stack[stack_pos].bl, rtn);
stack_pos--;
goto go_up;
}
break;
case E_EQUAL:
rtn = boolexpr_eql(sl, expr->left.sym, expr->right.sym);
goto go_up;
case E_UNEQUAL:
rtn =
boolexpr_not(boolexpr_eql
(sl, expr->left.sym, expr->right.sym));
goto go_up;
default:
fprintf(stderr, "ERROR: Unknown expression type.\n");
}
continue;
go_up:
if (--back_pos >= 0)
expr = back[back_pos];
else
expr = NULL;
}
free(back);
free(stack);
return rtn;
}
struct boolexpr *boolexpr_true() {
struct boolexpr *rtn;
rtn = malloc(sizeof(struct boolexpr));
rtn->type = BT_TRUE;
rtn->overusage = 0;
rtn->id = 0;
return rtn;
}
struct boolexpr *boolexpr_false() {
struct boolexpr *rtn;
rtn = malloc(sizeof(struct boolexpr));
rtn->type = BT_FALSE;
rtn->overusage = 0;
rtn->id = 0;
return rtn;
}
struct boolexpr *boolexpr_sym(struct symlist *sl, struct symbol *sym,
bool modulesym) {
struct boolexpr *rtn;
rtn = malloc(sizeof(struct boolexpr));
rtn->overusage = 0;
if (!strcmp(sym->name, "m")) {
if (modulesym)
rtn->type = BT_TRUE;
else
rtn->type = BT_FALSE;
} else if (!strcmp(sym->name, "n")) {
rtn->type = BT_FALSE;
} else if (!strcmp(sym->name, "y")) {
rtn->type = BT_TRUE;
} else {
rtn->id = symlist_id(sl, sym->name);
if (rtn->id != 0)
rtn->type = BT_SYM;
else
rtn->type = BT_FALSE;
}
return rtn;
}
struct boolexpr *boolexpr_eql(struct symlist *sl,
struct symbol *sym1, struct symbol *sym2) {
if (!strcmp(sym2->name, "m")) {
struct boolexpr *rtn = malloc(sizeof(struct boolexpr));
rtn->overusage = 0;
rtn->id = 0;
rtn->type = BT_FALSE;
return rtn;
}
if (!strcmp(sym2->name, "n"))
return boolexpr_not(boolexpr_sym(sl, sym1, false));
if (!strcmp(sym2->name, "y"))
return boolexpr_sym(sl, sym1, false);
// sym1 <-> sym2
// (!sym1 || sym2) && (sym1 || !sym2)
return
boolexpr_and(boolexpr_or
(boolexpr_not(boolexpr_sym(sl, sym1, false)),
boolexpr_sym(sl, sym2, false)),
boolexpr_or(boolexpr_sym(sl, sym1, false),
boolexpr_not(boolexpr_sym
(sl, sym2, false))));
}
struct boolexpr *boolexpr_or(struct boolexpr *e1, struct boolexpr *e2) {
switch (e1->type) {
case BT_TRUE:
boolexpr_free(e2);
return e1;
case BT_FALSE:
boolexpr_free(e1);
return e2;
default:
switch (e2->type) {
case BT_TRUE:
boolexpr_free(e1);
return e2;
case BT_FALSE:
boolexpr_free(e2);
return e1;
default:
break;
}
break;
}
struct boolexpr *rtn;
rtn = malloc(sizeof(struct boolexpr));
rtn->type = BT_OR;
rtn->overusage = 0;
rtn->id = 0;
rtn->left = e1;
rtn->right = e2;
return rtn;
}
struct boolexpr *boolexpr_and(struct boolexpr *e1, struct boolexpr *e2) {
switch (e1->type) {
case BT_FALSE:
boolexpr_free(e2);
return e1;
case BT_TRUE:
boolexpr_free(e1);
return e2;
default:
switch (e2->type) {
case BT_FALSE:
boolexpr_free(e1);
return e2;
case BT_TRUE:
boolexpr_free(e2);
return e1;
default:
break;
}
break;
}
struct boolexpr *rtn;
rtn = malloc(sizeof(struct boolexpr));
rtn->type = BT_AND;
rtn->overusage = 0;
rtn->id = 0;
rtn->left = e1;
rtn->right = e2;
return rtn;
}
struct boolexpr *boolexpr_not(struct boolexpr *e) {
struct boolexpr *rtn;
rtn = malloc(sizeof(struct boolexpr));
rtn->overusage = 0;
rtn->id = 0;
switch (e->type) {
case BT_FALSE:
rtn->type = BT_TRUE;
boolexpr_free(e);
break;
case BT_TRUE:
rtn->type = BT_FALSE;
boolexpr_free(e);
break;
default:
rtn->type = BT_NOT;
rtn->left = e;
break;
}
return rtn;
}
void boolexpr_free(struct boolexpr *e) {
struct boolexpr **stack;
size_t stack_size = 2, stack_pos = 0;
stack = malloc(stack_size * sizeof(struct boolexpr *));
struct boolexpr *m;
while (e != NULL) {
m = e;
switch (e->type) {
case BT_OR:
case BT_AND:
if (++stack_pos >= stack_size) {
stack_size *= 2;
stack =
realloc(stack, stack_size * sizeof(struct boolexpr *));
}
stack[stack_pos - 1] = e->right;
case BT_NOT:
e = e->left;
break;
default:
if (stack_pos > 0)
e = stack[--stack_pos];
else
e = NULL;
}
if (m->overusage > 0)
m->overusage--;
else
free(m);
}
free(stack);
}
struct boolexpr *boolexpr_copy(struct boolexpr *e) {
struct boolexpr **stack;
size_t stack_size = 2, stack_pos = 0;
stack = malloc(stack_size * sizeof(struct boolexpr *));
while (e != NULL) {
e->overusage++;
switch (e->type) {
case BT_OR:
case BT_AND:
if (++stack_pos >= stack_size) {
stack_size *= 2;
stack =
realloc(stack, stack_size * sizeof(struct boolexpr *));
}
stack[stack_pos - 1] = e->right;
case BT_NOT:
e = e->left;
break;
default:
if (stack_pos > 0)
e = stack[--stack_pos];
else
e = NULL;
}
}
free(stack);
return e;
}
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