r16/emu/cpu/stack.c

#include "./stack.h"
#include <stdlib.h>
#include <stdio.h>

r16_int StackPop()
{
    #ifdef DO_STACK_CHECKS
    if (GetRegister(SP).u == 0)
    {
        fprintf(stderr, "STACK UNDERFLOW\n");
        exit(-1);
    }
    #endif

    SetRegister(SP, (r16_int){ GetRegister(SP).u - 1 });
    return GetValue((r16_int){ GetRegister(SP).u + STACK_LOCATION });
}

void StackPush(r16_int value)
{
    #ifdef DO_STACK_CHECKS
    if (GetRegister(SP).u >= STACK_SIZE)
    {
        fprintf(stderr, "STACK OVERFLOW\n");
        exit(-1);
    }
    #endif

    SetValue((r16_int){ GetRegister(SP).u + STACK_LOCATION }, value);
    SetRegister(SP, (r16_int){ GetRegister(SP).u + 1 });
}