Summary: Add a use of the node cx to avoid it being destroyed.
Backport from JDK-8217359: https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8217359
This patch of OpenJDK is available here: https://hg.openjdk.java.net/jdk/jdk12/rev/44f41693631f

Test Plan: test/compiler/c2/Test8217359.java

Reviewed-by: luchsh, kuaiwei

Issue: https://github.com/alibaba/dragonwell8/issues/11

Summary: add compatibility for UnlockCommercialFeatures

Test Plan: test/jfr/test_unlockCommercialFeatures_compatibility.sh

Reviewed-by: yfxhust, luchsh

Issue: https://github.com/alibaba/dragonwell8_hotspot/issues/6

Summary:
fix typo error in test case

Test Plan: test/jwarmup/TestClassInitChain.java

Reviewed-by: luchsh

Issue: https://github.com/alibaba/dragonwell8/issues/16

Summary: whitebox library is missing in TestThrowInitializaitonException.java

Test Plan: hotspot/test/jwarmup/TestThrowInitializaitonException.java

Reviewers: 三红, 传胜

Reviewed By: 三红, 传胜

Subscribers: 麦庶

Differential Revision: https://aone.alibaba-inc.com/code/D855652

Summary:
  Port jwarmup to dragonwell 8u hotspot

ref T19299187

Test Plan:
test/hotspot/jtreg/jwarmup/Issue11272598.java
test/hotspot/jtreg/jwarmup/TestDisableNCE.java
test/hotspot/jtreg/jwarmup/TestNotDeoptJITMethod.sh
test/hotspot/jtreg/jwarmup/issue9780156.sh
test/hotspot/jtreg/jwarmup/TestEagerCompilation.java
test/hotspot/jtreg/jwarmup/TestNotifyDeopt.sh
test/hotspot/jtreg/jwarmup/TestCheckIfCompilationIsComplete.sh
test/hotspot/jtreg/jwarmup/TestFlagAssertion.java
test/hotspot/jtreg/jwarmup/TestReadLogfile.java
test/hotspot/jtreg/jwarmup/TestClassInitChain.java
test/hotspot/jtreg/jwarmup/TestLogFlush.java
test/hotspot/jtreg/jwarmup/TestRecordNullMethodCounter.java
test/hotspot/jtreg/jwarmup/TestThrowInitializaitonException.java
test/hotspot/jtreg/jwarmup/TestDisableMethodData.sh
test/hotspot/jtreg/jwarmup/TestMethodRecorder.java
test/hotspot/jtreg/jwarmup/TestTieredCompilationInRecording.sh

Reviewers: 传胜, 三红, yumin.qi

Reviewed By: 传胜, 三红

Subscribers: 麦庶

Differential Revision: https://aone.alibaba-inc.com/code/D852146

Summary:
- add a warning of large array allocation
- port D3674 to dragonwell

Test Plan: test/runtime/memory/TestArrayAllocationWarning.java

Reviewers: 传胜

Differential Revision: https://aone.alibaba-inc.com/code/D851704

Summary:
- The original GC printing did not change in the gc log after a full gc, this patch will fix this printing problem
- port D65612 to dragonwell

Test Plan: hotspot/test/gc/metaspace/TestMetaspaceGCLogSize.java

Reviewers: 传胜

Differential Revision: https://aone.alibaba-inc.com/code/D851703

Summary:
- port D64010 to dragonwell
- print the detail time when doing root processing in generational heap collection

Test Plan:
hotspot/test/gc/TestPrintGCRootsTraceTime.java
hotspot/test/gc/

Reviewers: 传胜

Differential Revision: https://aone.alibaba-inc.com/code/D851700

Summary:
- Port D65580 to dragonwell
- Print the young generation histogram once after parnew gc with the manageable flag: PrintYoungGenHistoAfterParNewGC

Test Plan: hotspot/test/gc/parNew/testPrintYoungGenHisto.sh

Reviewers: 传胜

Differential Revision: https://aone.alibaba-inc.com/code/D849729

Summary:
- Port D336179 mini-heapdump support to Dragonwell
- Enable HotSpot to skip dumping content of primitive type arrays

Test Plan: hotspot/test/serviceability, jdk/test/ras

Reviewers: 井桐

Reviewed By: 井桐

Differential Revision: https://aone.alibaba-inc.com/code/D849312

Summary:
- Port fix D2553 to Dragonwell
- Change default GC policy to UseConcMarkSweepGC

Test Plan: hotspot/test/gc/TestDefaultGC.sh

Reviewers: 井桐

Reviewed By: 井桐

Subscribers:

Differential Revision: https://aone.alibaba-inc.com/code/D849276

Reviewers: 效山, 芳玺, 传胜, 三红, yumin.qi

Reviewed By: 三红, 芳玺, 效山, 卓仁

Differential Revision: https://aone.alibaba-inc.com/code/D815657

Summary: Prevent downgraded compilation tasks from recompiling.
Reviewed-by: sgehwolf, thartmann, andrew

Summary: Includes compile_id addition from JDK-8054492
Reviewed-by: andrew

Summary: Avoided collecting unaligned stores in Initialize node by making can_capture_store return false for same
Reviewed-by: dlong, kvn, vlivanov

Summary: Add hotspot/test/runtime/jni directory with two tests for 8176100
Reviewed-by: kbarrett, coleenp, tschatzl

8180904: Hotspot tests running with -agentvm failing due to classpath
Summary: Add -cp System.getProperty("java.class.path") to ProcessBuilder arguments.
Reviewed-by: sla, gtriantafill

Reviewed-by: neliasso, kvn

Reviewed-by: kvn

8172850: Anti-dependency on membar causes crash in register allocator due to invalid instruction scheduling
Summary: Regression test and additional asserts. The problem is fixed by 8087341.
Reviewed-by: kvn

Reviewed-by: kvn

Summary: Replace shell script with Java-only code
Reviewed-by: kvn, iignatyev

Reviewed-by: acorn, hseigel, ahgross, rhalade

Summary: Created tests for the feature
Reviewed-by: mseledtsov

Reviewed-by: tschatzl

Reviewed-by: coleenp, sla

Reviewed-by: kvn
Contributed-by: vaibhav.x.choudhary@oracle.com

Reviewed-by: coleenp, sla

Reviewed-by: dholmes, erikj

Reviewed-by: dholmes, erikj

8156137: SIGSEGV in ReceiverTypeData::clean_weak_klass_links
8057570: RedefineClasses() tests fail assert(((Metadata*)obj)->is_valid()) failed: obj is valid
Reviewed-by: coleenp

8156137: SIGSEGV in ReceiverTypeData::clean_weak_klass_links
8057570: RedefineClasses() tests fail assert(((Metadata*)obj)->is_valid()) failed: obj is valid
Reviewed-by: coleenp

Reviewed-by: dholmes

Summary: Adding VM.dynlibs as a dcmd to dump all loaded dynamic libraries.
Reviewed-by: fparain, mgronlun

Summary: Implement Diagnostic Commands for heap and finalizerinfo
Reviewed-by: mchung

Summary: modified jtreg tags and package import to work with JDK 8
Reviewed-by: vlivanov, dholmes

8087291: InitialBootClassLoaderMetaspaceSize and CompressedClassSpaceSize should be checked consistent from MaxMetaspaceSize
Reviewed-by: dholmes, sspitsyn, poonam

Reviewed-by: jrose, coleenp, ahgross, acorn, vlivanov

Reviewed-by: kvn

Summary: Bailout if OSR entry is unreachable.
Reviewed-by: thartmann
Contributed-by: NAndreas Woess <andreas.woess@oracle.com>