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package value
import "jinx/pkg/lang/vm/mem"
type Env struct {
references []reference
}
func NewEnv() Env {
return Env{
references: make([]reference, 0),
}
}
func (e *Env) Allocate(m mem.Mem) (mem.Ptr, error) {
ptr, err := m.Allocate(mem.CellKindEnv)
if err != nil {
return mem.NullPtr, err
}
if err = m.Set(ptr, EnvCell(*e)); err != nil {
return mem.NullPtr, err
}
return ptr, nil
}
func (e *Env) Add(stackIndex int, outlet mem.Ptr) {
e.references = append(e.references, reference{
stackIndex: stackIndex,
outlet: outlet,
})
}
func (e *Env) Prepend(stackIndex int, outlet mem.Ptr) {
e.references = append([]reference{
{
stackIndex: stackIndex,
outlet: outlet,
},
}, e.references...)
}
func (e *Env) Clone(m mem.Mem) (Env, error) {
cloned := NewEnv()
for i := 0; i < e.Len(); i++ {
differentOutlet := e.GetOutlet(i)
if err := m.Retain(differentOutlet); err != nil {
return Env{}, err
}
cloned.Add(e.GetStackIndex(i), differentOutlet)
}
return cloned, nil
}
// TODO: Add bounds checking
func (e *Env) GetOutlet(envIndex int) mem.Ptr {
return e.references[envIndex].outlet
}
func (e *Env) GetStackIndex(envIndex int) int {
return e.references[envIndex].stackIndex
}
func (e *Env) Len() int {
return len(e.references)
}
type reference struct {
stackIndex int
outlet mem.Ptr
}
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