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package j1
type stack struct {
data [0x20]uint16 // stack
sp int8 // 5 bit stack pointer
}
func (s *stack) move(dir int8) {
s.sp = (s.sp + dir) & 0x1f
}
func (s *stack) push(v uint16) {
s.sp = (s.sp + 1) & 0x1f
s.data[s.sp] = v
}
func (s *stack) pop() uint16 {
sp := s.sp
s.sp = (s.sp - 1) & 0x1f
return s.data[sp]
}
func (s *stack) peek() uint16 {
return s.data[s.sp]
}
func (s *stack) replace(v uint16) {
s.data[s.sp] = v
}
func (s *stack) depth() uint16 {
return uint16(s.sp)
}
func (s *stack) dump() []uint16 {
return s.data[:s.sp+1]
}
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