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

Reviewed-by: phh, mbalao, bae

Summary: Correction of failed backport of JDK-8211394 via JDK-8212696.
Reviewed-by: dholmes, coffeys

Reviewed-by: dbuck

Summary: Backport from JDK12
Reviewed-by: dholmes

Summary: Backport from JDK9
Reviewed-by: dholmes, coffeys

Reviewed-by: acorn, hseigel, ahgross, rhalade

Reviewed-by: dholmes

Summary: Add resolved_references and init_lock as hidden static field in class so root is found.
Reviewed-by: dholmes, coleenp

Reviewed-by: coleenp, eosterlund, mchung, ahgross, rhalade

Reviewed-by: coleenp, eosterlund, mchung, ahgross, rhalade

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

Reviewed-by: acorn, ahgross, rhalade
Contributed-by: harold.seigel@oracle.com

Summary: C1 intrinsics for System.nanoTime(), System.currentTimeMillis() and JVM.counterTime() should be pinned.
Reviewed-by: kvn, vlivanov, iveresov

Summary: C1 intrinsics for System.nanoTime(), System.currentTimeMillis() and JVM.counterTime() should be pinned.
Reviewed-by: kvn, vlivanov, iveresov

Summary: Make appending found dead BasicHashtableEntrys to the free list atomic.
Reviewed-by: ehelin, shade

Reviewed-by: dholmes, ehelin

Reviewed-by: dholmes, ehelin

8171194: Exception "Duplicate field name&signature in class file" should report the name and signature of the field
Summary: Added code to emit name and signature of duplicate field in java.lang.ClassFormatError exception message
Reviewed-by: dholmes, coleenp

Summary: Re-application of the change in JDK-8152271.
Reviewed-by: coleenp, sspitsyn

Summary: Re-application of the change in JDK-8152271.
Reviewed-by: coleenp, sspitsyn

Summary: Use Patching_lock to synchronize access between set_code() and clear_code().
Reviewed-by: kvn, dlong

Summary: Fix method searches to handle static, private instance and overpass
Reviewed-by: acorn

Reviewed-by: hseigel

Reviewed-by: hseigel

Summary: Behavior of strncmp may be unexpected if char buffers[s] is[are] not null terminated and buffer size is smaller than the length n. Added check to avoid this scenario.
Reviewed-by: dholmes, iklam

Summary: Behavior of strncmp may be unexpected if char buffers[s] is[are] not null terminated and buffer size is smaller than the length n. Added check to avoid this scenario.
Reviewed-by: dholmes, iklam

Reviewed-by: rprotacio

Reviewed-by: acorn, mschoene, ctornqvi
Contributed-by: harold.seigel@oracle.com

8042660: vm/mlvm/anonloader/stress/byteMutation failed with: assert(index >=0 && index < _length) failed: symbol index overflow
Summary: Detect zero length signatures and throw ClassFormatError before bad dereference occurs
Reviewed-by: hseigel

Reviewed-by: acorn, mschoene
Contributed-by: harold.seigel@oracle.com

Reviewed-by: acorn, mschoene
Contributed-by: harold.seigel@oracle.com

Reviewed-by: rprotacio

Summary: MetadataOnStackMark must be done before calling free_deallocate_list().
Reviewed-by: coleenp, sspitsyn

Reviewed-by: acorn, jdn
Contributed-by: harold.seigel@oracle.com

Reviewed-by: acorn, jdn
Contributed-by: harold.seigel@oracle.com

Summary: Guarantee is to ensure classloader is a valid oop will help catch the errors at an early stage rather than crashing the JVM later on in the GC
Reviewed-by: coleenp