optional.h
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optional.h
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	#ifndef SV_OPTIONAL_H
	#define SV_OPTIONAL_H

	#include "silver/engine.h"
	#include "property.h"

	static inline ant_value_t sv_op_get_field_opt(sv_vm_t vm, ant_t js, sv_func_t func, uint8_t ip) {
	uint32_t idx = sv_get_u32(ip + 1);
	sv_atom_t *a = &func->atoms[idx];
	ant_value_t obj = vm->stack[--vm->sp];
	uint8_t t = vtype(obj);
	if (t == T_NULL \|\| t == T_UNDEF) {
	vm->stack[vm->sp++] = js_mkundef();
	return js_mkundef();
	} else {
	ant_value_t res = sv_prop_get_at(js, obj, a->str, a->len, func, ip);
	if (is_err(res)) return res;
	vm->stack[vm->sp++] = res;
	return js_mkundef();
	}
	}

	static inline ant_value_t sv_op_get_elem_opt(sv_vm_t vm, ant_t js, sv_func_t func, uint8_t ip) {
	ant_value_t key = vm->stack[--vm->sp];
	ant_value_t obj = vm->stack[--vm->sp];
	uint8_t t = vtype(obj);
	if (t == T_NULL \|\| t == T_UNDEF) {
	vm->stack[vm->sp++] = js_mkundef();
	return js_mkundef();
	}
	vm->stack[vm->sp++] = obj;
	vm->stack[vm->sp++] = key;
	return sv_op_get_elem(vm, js, func, ip);
	}

	#endif