8271598: CDS classlist file should support uber JARs

[calvinccheung]

Currently, for archive classes for custom loaders, CDS supports the following source locations in the classlist:
/some/dir
/some/file.jar

However, some apps packaged in an uber jar load classes using custom loaders from locations such as the following:
jar:file:/some/file.jar!/another/file2.jar!/
jar:file:/some/file.jar!/another/dir!/

This RFE adds support for the above locations in the classlist and load classes from the above locations during
CDS static dump. The implementation of class loading is in the UberJarUtils and related classes. The
UberJarUtils.loadClass() is the static method called by the VM during CDS static dump for loading classes.
Since the UberJarUtils class also handles existing source locations (simple directory and jar), the existing implementation
in the VM could be simplified.

Testing:

• tiers 1 - 4 (including the new test)

---

Progress

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Issue

• JDK-8271598: CDS classlist file should support uber JARs

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[calvinccheung]

/label add hotpot-runtime

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[openjdk]

@calvinccheung The label hotpot-runtime is not a valid label. These labels are valid:

• serviceability
• hotspot
• hotspot-compiler
• ide-support
• kulla
• i18n
• shenandoah
• jdk
• javadoc
• security
• hotspot-runtime
• jmx
• build
• nio
• client
• core-libs
• compiler
• net
• hotspot-gc
• hotspot-jfr

[openjdk]

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• core-libs
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[calvinccheung]

/label remove hotspot
/label add hotspot-runtime

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@calvinccheung
The hotspot label was successfully removed.

[openjdk]

@calvinccheung
The hotspot-runtime label was successfully added.

[calvinccheung]

/label remove core-libs

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@calvinccheung
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[mlbridge]

Webrevs

• 00: Full (83812354)

[AlanBateman]

/label add core-libs

[openjdk]

@AlanBateman
The core-libs label was successfully added.

[AlanBateman]

I've added the core-libs label to this issue as this will require wider discussion, detailed review of the classes that are being added to jdk.internal.misc, and a discussion as to whether this is the right place.

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