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typedef struct Value {
union {
Integer intv;
Floating floatv;
struct Value *points_to;
FnExpr fn;
};
} Value;
/* NOTE: expr must be typed before it can be evaluated */
static bool eval_expr(Expression *e, Value *v) {
/* TODO: cache eval'd expression values (probably only needed for declarations) */
switch (e->kind) {
case EXPR_LITERAL_FLOAT:
v->floatv = e->floatl;
return false;
case EXPR_LITERAL_INT:
if (e->intl > (UInteger)INTEGER_MAX) { /* TODO: FIXME */
err_print(e->where, "Overflow when evaluating integer.");
return false;
}
v->intv = (Integer)e->intl;
return true;
case EXPR_LITERAL_STR:
err_print(e->where, "not implemented yet"); /* TODO */
return false;
case EXPR_UNARY_OP: {
Expression *of_expr = e->unary.of;
switch (e->unary.op) {
case UNARY_MINUS: {
Value of;
if (!eval_expr(of_expr, &of)) return false;
assert(e->type.kind != TYPE_BUILTIN);
if (type_builtin_is_integer(e->type.builtin)) {
v->intv = -of.intv;
} else if (type_builtin_is_floating(e->type.builtin)) {
v->floatv = -of.floatv;
} else {
err_print(e->where, "negation of non-numerical types not supported in evaluator yet.");
return false;
}
return true;
}
case UNARY_ADDRESS:
v->points_to = malloc(sizeof *v->points_to); /* OPTIM */
return eval_expr(e->unary.of, v->points_to);
case UNARY_DEREF: {
Value ptr;
if (!eval_expr(of_expr, &ptr)) return false;
*v = *ptr.points_to;
return true;
} break;
}
} break;
case EXPR_BINARY_OP: {
Value lhs, rhs;
/* NOTE: this will need to change for short-circuiting */
if (!eval_expr(e->binary.lhs, &lhs)) return false;
if (!eval_expr(e->binary.rhs, &rhs)) return false;
bool is_int = type_builtin_is_integer(e->type.builtin);
bool is_float = type_builtin_is_floating(e->type.builtin);
switch (e->binary.op) {
case BINARY_PLUS:
if (is_int) {
v->intv = lhs.intv + rhs.intv;
} else if (is_float) {
v->floatv = lhs.floatv + rhs.floatv;
} else assert(0);
return true;
case BINARY_MINUS:
if (is_int) {
v->intv = lhs.intv - rhs.intv;
} else if (is_float) {
v->floatv = lhs.floatv - rhs.floatv;
} else assert(0);
return true;
case BINARY_MUL:
if (is_int) {
v->intv = lhs.intv * rhs.intv;
} else if (is_float) {
v->floatv = lhs.floatv * rhs.floatv;
} else assert(0);
return true;
case BINARY_DIV:
/* TODO(eventually): check div by 0 */
if (is_int) {
v->intv = lhs.intv / rhs.intv;
} else if (is_float) {
v->floatv = lhs.floatv / rhs.floatv;
} else assert(0);
return true;
case BINARY_SET:
return true;
case BINARY_COMMA:
err_print(e->where, "tuples not supported at compile time yet.");
return false;
case BINARY_AT_INDEX:
err_print(e->where, "Cannot get index of array at compile time yet.");
return false;
}
} break;
case EXPR_IDENT: {
Identifier id = e->ident;
IdentDecl *id_decl = ident_decl(id);
if (!id_decl) {
char *id_str = ident_to_str(id);
err_print(e->where, "Undeclared identifier: %s", id_str);
free(id_str);
return false;
}
Declaration *d = id_decl->decl;
if (location_after(d->where, e->where)) {
err_print(e->where, "Use of constant before its declaration.");
info_print(d->where, "Declaration will be here.");
return false;
}
if (!(d->flags & DECL_FLAG_CONST)) {
err_print(e->where, "Use of non-constant identifier in a constant expression.");
info_print(d->where, "Declaration was here.");
return false;
}
/* TODO: tuples */
if (!d->val) {
d->val = err_malloc(sizeof *d->val); /* OPTIM */
if (!eval_expr(&d->expr, d->val))
return false;
}
*v = *d->val;
return true;
} break;
case EXPR_FN:
v->fn = *e->fn;
return true;
case EXPR_CALL:
err_print(e->where, "Compile time function calling not supported yet."); /* TODO */
break;
case EXPR_BLOCK:
err_print(e->where, "Block eval not supported yet."); /* TODO */
break;
case EXPR_DIRECT:
switch (e->direct.which) {
case DIRECT_C:
err_print(e->where, "Can't run C code at compile time.");
return false;
case DIRECT_COUNT: assert(0); break;
}
break;
}
err_print(e->where, "Not implemented yet");
return false;
}
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