This PR changes proxy code gen to avoid generating
`Class.forName("java.lang.Object")`, instead emitting an ldc for the class
literal, `ldc(CD_Object)`, java code equivalent `Object.class`.
More types could profitably use `ldc(ClassDesc/-Entry)`, taking cues from
`InvokerBytecodeGenerator.isStaticallyInvocable`, but just addressing the
`Object` methods gets rid of most `Class.forName` emits. It's not terribly
important for throughput performance since these are called in the generated
`clinit`, so getting a quick win with few additional checks is a good starting
point.
Added a few unrelated minor refactors/improvements, guided by diagnostic runs
of the now fixed microbenchmark.
-------------
Commit messages:
- Merge branch 'master' into proxy_codeClass_ProxyPerf
- Minor improvements
- Refactor
- Tune warmup and measurement time for ProxyGeneratorBench
- rename and improve Proxy micros
- Fix ProxyPerf microbenchmark and micro-optimize codeClassForName
Changes: https://git.openjdk.org/jdk/pull/21090/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21090&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8340456
Stats: 327 lines in 4 files changed: 146 ins; 166 del; 15 mod
Patch: https://git.openjdk.org/jdk/pull/21090.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/21090/head:pull/21090
PR: https://git.openjdk.org/jdk/pull/21090
