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8339290: Optimize ClassFile Utf8EntryImpl#writeTo

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Reviewed-by: redestad, liach
This commit is contained in:
Shaojin Wen 2024-09-05 11:45:49 +00:00 • committed by Claes Redestad
parent 340e131d61
commit cb9f5c5791
7 changed files with 268 additions and 49 deletions
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42
src/java.base/share/classes/java/lang/StringCoding.java
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2000, 2022, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2000, 2024, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2024, Alibaba Group Holding Limited. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -34,6 +35,45 @@ class StringCoding {
private StringCoding() { }
/**
* Count the number of leading non-zero ascii chars in the range.
*/
public static int countNonZeroAscii(String s) {
byte[] value = s.value();
if (s.isLatin1()) {
return countNonZeroAsciiLatin1(value, 0, value.length);
} else {
return countNonZeroAsciiUTF16(value, 0, s.length());
}
}
/**
* Count the number of non-zero ascii chars in the range.
*/
public static int countNonZeroAsciiLatin1(byte[] ba, int off, int len) {
int limit = off + len;
for (int i = off; i < limit; i++) {
if (ba[i] <= 0) {
return i - off;
}
}
return len;
}
/**
* Count the number of leading non-zero ascii chars in the range.
*/
public static int countNonZeroAsciiUTF16(byte[] ba, int off, int strlen) {
int limit = off + strlen;
for (int i = off; i < limit; i++) {
char c = StringUTF16.charAt(ba, i);
if (c == 0 || c > 0x7F) {
return i - off;
}
}
return strlen;
}
public static boolean hasNegatives(byte[] ba, int off, int len) {
return countPositives(ba, off, len) != len;
}