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#include <stdlib.h>
#include "bytecode.h"
#include "error.h"
#include "stack.h"
void rlstk_push(struct rl_stack *s, rl_opcode_t val) {
if(s->top == STACKSIZE)
rl_fatal(EX_SOFTWARE, "Stack overflow");
s->data[s->top++] = val;
}
rl_opcode_t rlstk_pop(struct rl_stack *s) {
if(!s->top)
rl_fatal(EX_SOFTWARE, "Stack underflow");
return s->data[--s->top];
}
rl_opcode_t rlstk_peek(struct rl_stack *s, int offset) {
if(offset >= s->top)
rl_fatal(EX_SOFTWARE, "Stack peek undefined");
return s->data[s->top - offset - 1];
}
void rlstk_poke(struct rl_stack *s, int offset, rl_opcode_t val) {
if(offset >= s->top)
rl_fatal(EX_SOFTWARE, "Stack peek undefined");
s->data[s->top - offset - 1] = val;
}
struct rl_stack *rlstk_new() {
struct rl_stack *s;
s = malloc(sizeof(*s));
memset(s, 0, sizeof(*s));
return s;
}
void rlstk_free(struct rl_stack *s) {
free(s);
}
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