#40 reduce memory allocations for position.Position by using sync.Pool

php7/parser.go

@@ -60,7 +60,8 @@ func (l *Parser) Parse() int {
 	l.comments = parser.Comments{}
 	l.positions = parser.Positions{}
 	l.positionBuilder = &parser.PositionBuilder{
-		Positions: &l.positions,
+		Positions:    &l.positions,
+		PositionPool: &l.PositionPool,
 	}
 
 	// parse
@@ -111,6 +112,7 @@ func (p *Parser) returnTokenToPool(yyDollar []yySymType, yyVAL *yySymType) {
 	for i := 1; i < len(yyDollar); i++ {
 		if yyDollar[i].token != nil {
 			p.TokenPool.Put(yyDollar[i].token)
+			p.PositionPool.Put(yyDollar[i].token.Position)
 		}
 		yyDollar[i].token = nil
 	}