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package hm
import "sync"
const (
poolSize = 4
extraCap = 2
)
var sSubPool = [poolSize]*sync.Pool{
&sync.Pool{
New: func() interface{} { return &sSubs{s: make([]Substitution, 1, 1+extraCap)} },
},
&sync.Pool{
New: func() interface{} { return &sSubs{s: make([]Substitution, 2, 2+extraCap)} },
},
&sync.Pool{
New: func() interface{} { return &sSubs{s: make([]Substitution, 3, 3+extraCap)} },
},
&sync.Pool{
New: func() interface{} { return &sSubs{s: make([]Substitution, 4, 4+extraCap)} },
},
}
var mSubPool = &sync.Pool{
New: func() interface{} { return make(mSubs) },
}
// ReturnSubs returns substitutions to the pool. USE WITH CAUTION.
func ReturnSubs(sub Subs) {
switch s := sub.(type) {
case mSubs:
for k := range s {
delete(s, k)
}
mSubPool.Put(sub)
case *sSubs:
size := cap(s.s) - 2
if size > 0 && size < poolSize+1 {
// reset to empty
for i := range s.s {
s.s[i] = Substitution{}
}
s.s = s.s[:size]
sSubPool[size-1].Put(sub)
}
}
}
// BorrowMSubs gets a map based substitution from a shared pool. USE WITH CAUTION
func BorrowMSubs() mSubs {
return mSubPool.Get().(mSubs)
}
// BorrowSSubs gets a slice based substituiton from a shared pool. USE WITH CAUTION
func BorrowSSubs(size int) *sSubs {
if size > 0 && size < 5 {
retVal := sSubPool[size-1].Get().(*sSubs)
return retVal
}
s := make([]Substitution, size)
return &sSubs{s: s}
}
var typesPool = [poolSize]*sync.Pool{
&sync.Pool{
New: func() interface{} { return make(Types, 1) },
},
&sync.Pool{
New: func() interface{} { return make(Types, 2) },
},
&sync.Pool{
New: func() interface{} { return make(Types, 3) },
},
&sync.Pool{
New: func() interface{} { return make(Types, 4) },
},
}
// BorrowTypes gets a slice of Types with size. USE WITH CAUTION.
func BorrowTypes(size int) Types {
if size > 0 && size < poolSize+1 {
return typesPool[size-1].Get().(Types)
}
return make(Types, size)
}
// ReturnTypes returns the slice of types into the pool. USE WITH CAUTION
func ReturnTypes(ts Types) {
if size := cap(ts); size > 0 && size < poolSize+1 {
ts = ts[:cap(ts)]
for i := range ts {
ts[i] = nil
}
typesPool[size-1].Put(ts)
}
}
var typeVarSetPool = [poolSize]*sync.Pool{
&sync.Pool{
New: func() interface{} { return make(TypeVarSet, 1) },
},
&sync.Pool{
New: func() interface{} { return make(TypeVarSet, 2) },
},
&sync.Pool{
New: func() interface{} { return make(TypeVarSet, 3) },
},
&sync.Pool{
New: func() interface{} { return make(TypeVarSet, 4) },
},
}
// BorrowTypeVarSet gets a TypeVarSet of size from pool. USE WITH CAUTION
func BorrowTypeVarSet(size int) TypeVarSet {
if size > 0 && size < poolSize+1 {
return typeVarSetPool[size-1].Get().(TypeVarSet)
}
return make(TypeVarSet, size)
}
// ReturnTypeVarSet returns the TypeVarSet to pool. USE WITH CAUTION
func ReturnTypeVarSet(ts TypeVarSet) {
var def TypeVariable
if size := cap(ts); size > 0 && size < poolSize+1 {
ts = ts[:cap(ts)]
for i := range ts {
ts[i] = def
}
typeVarSetPool[size-1].Put(ts)
}
}
var fnTypePool = &sync.Pool{
New: func() interface{} { return new(FunctionType) },
}
func borrowFnType() *FunctionType {
return fnTypePool.Get().(*FunctionType)
}
// ReturnFnType returns a *FunctionType to the pool. NewFnType automatically borrows from the pool. USE WITH CAUTION
func ReturnFnType(fnt *FunctionType) {
if a, ok := fnt.a.(*FunctionType); ok {
ReturnFnType(a)
}
if b, ok := fnt.b.(*FunctionType); ok {
ReturnFnType(b)
}
fnt.a = nil
fnt.b = nil
fnTypePool.Put(fnt)
}
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