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|
package vm
import (
"jinx/pkg/lang/vm/value"
)
type CallStack []*LocalStack
func NewCallStack() CallStack {
return []*LocalStack{{}}
}
func (cs *CallStack) Push() error {
if len(*cs) > 1000 {
return ErrCallStackOverflow
}
*cs = append(*cs, &LocalStack{})
return nil
}
func (cs *CallStack) Pop() error {
if len(*cs) <= 1 {
return ErrCantPopRootFrame
}
*cs = (*cs)[:len(*cs)-1]
return nil
}
func (cs *CallStack) Top() *LocalStack {
return (*cs)[len(*cs)-1]
}
func (cs *CallStack) Prev() (*LocalStack, error) {
if len(*cs) <= 1 {
return nil, ErrNoPreviousCallFrame
}
return (*cs)[len(*cs)-2], nil
}
type LocalStack []value.Value
func (ls *LocalStack) Push(v value.Value) error {
if len(*ls) > 1000 {
return ErrLocalStackOverflow
}
*ls = append(*ls, v)
return nil
}
func (ls *LocalStack) Pop() (value.Value, error) {
if len(*ls) == 0 {
return value.Value{}, ErrCallFrameEmpty
}
v := (*ls)[len(*ls)-1]
*ls = (*ls)[:len(*ls)-1]
return v, nil
}
func (ls *LocalStack) At(at int) (value.Value, error) {
if at >= len(*ls) {
return value.Value{}, ErrLocalIndexOutOfBounds{
Index: at,
Len: len(*ls),
}
}
return (*ls)[at], nil
}
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