#include "am.h"

#include <assert.h>
#include <string.h>

void am_init(am_t *am)
{
	memset(am, 0, sizeof(am_t));
	am->sp = am->stack + AM_STACK_SIZE - 1;
}

void am_push(am_t *am)
{
	assert(am->sp >= am->stack);
	*am->sp-- = am->expr;
}

void am_pop(am_t *am)
{
	assert(am->sp < am->stack + AM_STACK_SIZE - 1);
	am->expr = *++am->sp;
}