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4947890: Minimize JNI upcalls in system-properties initialization

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Reviewed-by: erikj, mchung, bchristi, ihse, coleenp, stuefe
This commit is contained in:
Roger Riggs 2018-11-28 15:53:49 -05:00
parent 94f0c828e3
commit c1034b1cad
13 changed files with 628 additions and 294 deletions
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19
src/java.base/share/classes/java/lang/System.java
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@ -72,6 +72,7 @@ import jdk.internal.misc.VM;
import jdk.internal.logger.LoggerFinderLoader;
import jdk.internal.logger.LazyLoggers;
import jdk.internal.logger.LocalizedLoggerWrapper;
import jdk.internal.util.SystemProps;
import jdk.internal.vm.annotation.Stable;
import sun.reflect.annotation.AnnotationType;
import sun.nio.ch.Interruptible;
@ -605,7 +606,6 @@ public final class System {
*/
private static Properties props;
private static native Properties initProperties(Properties props);
/**
* Determines the current system properties.
@ -799,9 +799,9 @@ public final class System {
if (sm != null) {
sm.checkPropertiesAccess();
}
if (props == null) {
props = new Properties();
initProperties(props);
props = SystemProps.initProperties();
VersionProps.init(props);
}
System.props = props;
@ -1966,15 +1966,11 @@ public final class System {
// VM might invoke JNU_NewStringPlatform() to set those encoding
// sensitive properties (user.home, user.name, boot.class.path, etc.)
// during "props" initialization, in which it may need access, via
// System.getProperty(), to the related system encoding property that
// have been initialized (put into "props") at early stage of the
// initialization. So make sure the "props" is available at the
// very beginning of the initialization and all system properties to
// be put into it directly.
props = new Properties(84);
initProperties(props); // initialized by the VM
// during "props" initialization.
// The charset is initialized in System.c and does not depend on the Properties.
props = SystemProps.initProperties();
VersionProps.init(props);
StaticProperty.javaHome(); // Load StaticProperty to cache the property values
// There are certain system configurations that may be controlled by
// VM options such as the maximum amount of direct memory and
@ -1993,7 +1989,6 @@ public final class System {
VM.saveAndRemoveProperties(props);
lineSeparator = props.getProperty("line.separator");
StaticProperty.javaHome(); // Load StaticProperty to cache the property values
FileInputStream fdIn = new FileInputStream(FileDescriptor.in);
FileOutputStream fdOut = new FileOutputStream(FileDescriptor.out);