Avoid the static initialization of class in getCPMethodHandleAt

[ChengJin01]

The change is to avoid initializing the specified class
in getCPMethodHandleAt so as to postpone the static
initialization to the invocation of the method of this class.

Fixes: #10356

Signed-off-by: Cheng Jin jincheng@ca.ibm.com

[ChengJin01]

Reviewer: @DanHeidinga
FYI: @gacholio

[ChengJin01]

Currently have some issue with personal builds (Joe is working on that). Will wait till the problem out there gets resolved.

[DanHeidinga]

Minor nitpick but overall this looks like the right change to me

[DanHeidinga]

lgtm

[DanHeidinga]

@ChengJin01 can you confirm this matches the RI's behaviour in JDK8 & 11 as well?

[DanHeidinga]

Jenkins test sanity zlinux jdk8

[DanHeidinga]

Jenkins test sanity xlinux jdk11

[DanHeidinga]

Jenkins test sanity win jdk15

[ChengJin01]

@DanHeidinga , I just checked Java 8 & 11/Hotspot with the testcases (Test, Test2 and Test3) verified in #10356, which ended up with the same results as our build with my fix.

[1] The latest nightly build for Java 8/Hotspot downloaded from AdoptOpenJDK at https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u-2020-08-17-17-05/OpenJDK8U-jdk_x64_linux_hotspot_2020-08-17-17-05.tar.gz

$ ../jdk8u272-b02_hotspot/bin/java -version
openjdk version "1.8.0_272"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_272-202008161719-b02)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.272-b02, mixed mode)

$ ../jdk8u272-b02_hotspot/bin/java  Test2
prepared to invoke intHandle
calling BaseExample.<clinit> <-------
intValue = 1

$ ../jdk8u272-b02_hotspot/bin/java  Test3
prepared to invoke addHandle
calling BaseExample3.<clinit>  <-------
sum = 3

 $../jdk8u272-b02_hotspot/bin/java  Test
Class2.<clinit> called
obtaining method reference to Class1.dummyMethod
incrementing Class2.a
running Class1.dummyMethod via method reference
Class1.<clinit>: Class2.a is 1.0
Class1.dummyMethod: Class2.a is 1.0

[2] The latest nightly build for Java 11/Hotspot downloaded from AdoptOpenJDK at https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk11u-2020-08-12-08-12/OpenJDK11U-jdk_x64_linux_hotspot_2020-08-12-08-12.tar.gz

$ jdk_11.0.8_9_hotspot/bin/java -version
openjdk version "11.0.9" 2020-10-20
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.9+9-202008112346)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.9+9-202008112346, mixed mode)

$ ../jdk_11.0.8_9_hotspot/bin/java  Test2
prepared to invoke intHandle
calling BaseExample.<clinit>  <-------
intValue = 1

$ ../jdk_11.0.8_9_hotspot/bin/java  Test3
prepared to invoke addHandle
calling BaseExample3.<clinit>  <-------
sum = 3

$ ../jdk_11.0.8_9_hotspot/bin/java  Test
Class2.<clinit> called
obtaining method reference to Class1.dummyMethod
incrementing Class2.a
running Class1.dummyMethod via method reference
Class1.<clinit>: Class2.a is 1.0
Class1.dummyMethod: Class2.a is 1.0