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parser.leg: mk_element: preallocate slices of elements

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Michael Teichgräber 2010-12-13 17:49:24 +01:00
parent a77ab2f820
commit 61becb6c37
1 changed files with 13 additions and 1 deletions
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14
parser.leg
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@ -24,6 +24,7 @@ import (
"fmt" "fmt"
"strings" "strings"
"log" "log"
"sync"
) )
// Semantic value of a parsing action. // Semantic value of a parsing action.
@ -790,8 +791,19 @@ func concat_string_list(list *element) string {
/* mk_element - generic constructor for element /* mk_element - generic constructor for element
*/ */
var elbuf []element
var elock sync.Mutex
func mk_element(key int) *element { func mk_element(key int) *element {
return &element{key: key} elock.Lock()
if len(elbuf) == 0 {
elbuf = make([]element, 1024)
}
e := &elbuf[0]
elbuf = elbuf[1:]
elock.Unlock()
e.key = key
return e
} }
/* mk_str - constructor for STR element /* mk_str - constructor for STR element