On Wed, 13 Oct 2021 18:53:22 GMT, Mandy Chung <mch...@openjdk.org> wrote:
>> This reimplements core reflection with method handles. >> >> For `Constructor::newInstance` and `Method::invoke`, the new implementation >> uses `MethodHandle`. For `Field` accessor, the new implementation uses >> `VarHandle`. For the first few invocations of one of these reflective >> methods on a specific reflective object we invoke the corresponding method >> handle directly. After that we spin a dynamic bytecode stub defined in a >> hidden class which loads the target `MethodHandle` or `VarHandle` from its >> class data as a dynamically computed constant. Loading the method handle >> from a constant allows JIT to inline the method-handle invocation in order >> to achieve good performance. >> >> The VM's native reflection methods are needed during early startup, before >> the method-handle mechanism is initialized. That happens soon after >> System::initPhase1 and before System::initPhase2, after which we switch to >> using method handles exclusively. >> >> The core reflection and method handle implementation are updated to handle >> chained caller-sensitive method calls [1] properly. A caller-sensitive >> method can define with a caller-sensitive adapter method that will take an >> additional caller class parameter and the adapter method will be annotated >> with `@CallerSensitiveAdapter` for better auditing. See the detailed >> description from [2]. >> >> Ran tier1-tier8 tests. >> >> [1] https://bugs.openjdk.java.net/browse/JDK-8013527 >> [2] >> https://bugs.openjdk.java.net/browse/JDK-8271820?focusedCommentId=14439430&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14439430 > > Mandy Chung has updated the pull request incrementally with one additional > commit since the last revision: > > Minor cleanup. Improve javadoc in CallerSensitiveAdapter The JDI problem list and EATest.java changes are approved. test/hotspot/jtreg/ProblemList.txt line 43: > 41: vmTestbase/nsk/jvmti/AttachOnDemand/attach002a/TestDescription.java > 8265795 generic-all > 42: vmTestbase/nsk/jvmti/AttachOnDemand/attach022/TestDescription.java > 8265795 generic-all > 43: > vmTestbase/nsk/jdi/ObjectReference/referringObjects/referringObjects002/referringObjects002.java > 8265796 generic-all Approved. test/jdk/com/sun/jdi/EATests.java line 2203: > 2201: // the method depth in debuggee is 11 as it includes all hidden > frames > 2202: // the expected method depth is 6 excluding 5 hidden frames > 2203: testMethodDepth = 11-5; Approved. ------------- Marked as reviewed by cjplummer (Reviewer). PR: https://git.openjdk.java.net/jdk/pull/5027
