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8207263: Store the Configuration for system modules into CDS archive

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Archive boot layer Configuration.

Reviewed-by: redestad, iklam, ccheung
This commit is contained in:
Jiangli Zhou 2018-08-10 00:35:57 -04:00
parent 5858a507f4
commit a5d14313f5
13 changed files with 353 additions and 45 deletions
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14
src/java.base/share/classes/java/lang/module/Configuration.java
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@ -41,8 +41,10 @@ import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import jdk.internal.misc.VM;
import jdk.internal.module.ModuleReferenceImpl;
import jdk.internal.module.ModuleTarget;
import jdk.internal.vm.annotation.Stable;
/**
* A configuration that is the result of <a href="package-summary.html#resolution">
@ -103,7 +105,17 @@ import jdk.internal.module.ModuleTarget;
public final class Configuration {
// @see Configuration#empty()
private static final Configuration EMPTY_CONFIGURATION = new Configuration();
// EMPTY_CONFIGURATION may be initialized from the CDS archive.
private static @Stable Configuration EMPTY_CONFIGURATION;
static {
// Initialize EMPTY_CONFIGURATION from the archive.
VM.initializeFromArchive(Configuration.class);
// Create a new empty Configuration if there is no archived version.
if (EMPTY_CONFIGURATION == null) {
EMPTY_CONFIGURATION = new Configuration();
}
}
// parent configurations, in search order
private final List<Configuration> parents;