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8201179: Regression due loading java.nio.charset.StandardCharsets during bootstrap

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Reviewed-by: sherman, martin
This commit is contained in:
Claes Redestad 2018-04-10 16:16:34 +02:00
parent 370977cf4f
commit c40af49970
7 changed files with 33 additions and 16 deletions
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20
src/java.base/share/classes/sun/nio/cs/StandardCharsets.java.template
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@ -83,9 +83,9 @@ public class StandardCharsets extends CharsetProvider {
Map<String,Charset> map = cache;
if (map == null) {
map = new Cache();
map.put("utf-8", java.nio.charset.StandardCharsets.UTF_8);
map.put("iso-8859-1", java.nio.charset.StandardCharsets.ISO_8859_1);
map.put("us-ascii", java.nio.charset.StandardCharsets.US_ASCII);
map.put("utf-8", UTF_8.INSTANCE);
map.put("iso-8859-1", ISO_8859_1.INSTANCE);
map.put("us-ascii", US_ASCII.INSTANCE);
map.put("utf-16", java.nio.charset.StandardCharsets.UTF_16);
map.put("utf-16be", java.nio.charset.StandardCharsets.UTF_16BE);
map.put("utf-16le", java.nio.charset.StandardCharsets.UTF_16LE);
@ -122,15 +122,19 @@ public class StandardCharsets extends CharsetProvider {
private Charset lookup(String charsetName) {
init();
// By checking these built-ins we can avoid initializing Aliases and
// Classes eagerly during bootstrap
// By checking these built-ins we can avoid initializing Aliases,
// Classes and Cache eagerly during bootstrap.
//
// Initialization of java.nio.charset.StandardCharsets should be
// avoided here to minimize time spent in System.initPhase1, as it
// may delay initialization of performance critical VM subsystems.
String csn;
if (charsetName.equals("UTF-8")) {
return java.nio.charset.StandardCharsets.UTF_8;
return UTF_8.INSTANCE;
} else if (charsetName.equals("US-ASCII")) {
return java.nio.charset.StandardCharsets.US_ASCII;
return US_ASCII.INSTANCE;
} else if (charsetName.equals("ISO-8859-1")) {
return java.nio.charset.StandardCharsets.ISO_8859_1;
return ISO_8859_1.INSTANCE;
} else {
csn = canonicalize(toLower(charsetName));
}