<dropped jdk-dev> On 25/01/2019 6:52 pm, yumin qi wrote:
Hi,I have a question of anonymous class. We know the anonymous class with a host_klass, and the flag is set when the InstanceKlass is created after the class parsed. In case of a regular java class file, the flag will be set correctly but for the case it is not set: SystemDictionary::parse_stream or resolve_from_stream, which is called from JVM_DefineClassWithSource or jni_defineClass. The stack trace like: #1 0x00007f1127291ce7 in SystemDictionary::resolve_from_stream(class_name=0x7f0ee40243f0, class_loader=..., protection_domain=...,d__=0x7f0f04001000) at /home/ws/openjdk/8/jdk8u/hotspot/src/share/vm/classfile/systemDictionaryShared.cpp:656 #1 0x00007f1127291ce7 in SystemDictionary::resolve_from_stream (class_name=0x7f0ee40243f0, class_loader=..., protection_doma in=..., st=0x7f0f0a5f3850, verify=true, __the_thread__=0x7f0f04001000) at /home/ws/openjdk/8/jdk8u/hotspot/src/share/vm/classfile/systemDictionary.cpp:1234 #2 0x00007f1126f3cadb in jvm_define_class_common (env=0x7f0f04001220, name=0x7f0f0a5f3e60 "com/google/common/collect/Iterato rs$3", loader=0x7f0f0a5f3f20, buf=0x7f0ee401e210 "\312\376\272\276", len=943, pd=0x7f0f0a5f3f48, source=0x7f0f0a5f3a60 "jar:file:/home/<...>/lib/guava-19.0.jar!/", verify=1 '\001', __the_thread__=0x7f0f04001000) at /home/yumin.qi/ws/openjdk/8/jdk8u/hotspot/src/share/vm/prims/jvm.cpp:1082 #3 0x00007f1126f3d019 in JVM_DefineClassWithSource (env=0x7f0f04001220, name=0x7f0f0a5f3e60 "com/google/common/collect/Itera tors$3", loader=0x7f0f0a5f3f20, buf=0x7f0ee401e210 "\312\376\272\276", len=943, pd=0x7f0f0a5f3f48, source=0x7f0f0a5f3a60 "jar:file:/home/<...>/lib/guava-19.0.jar!/") at /home/ws/openjdk/8/jdk8u/hotspot/src/share/vm/prim/jvm.cpp:1102 #4 0x00007f112581214f in Java_java_lang_ClassLoader_defineClass1 () from /home/ws/openjdk/8/jdk8u/build/linux-x86_64-normal-server-slowdebug/images/j2sdk-image/jre/lib/amd64/libjava.so #5 0x00007f11118f5402 in ?? () #6 0x00007f0f0a5f3f48 in ?? () #7 0x00007f0f0a5f3f70 in ?? () #8 0x0000000755dbbc28 in ?? () The class name is com.google.common.collect.Iterators$3, and it is an anonymous class.
I'm confused. Are you talking about Java level anonymous classes or VM anonymous classes as created by Unsafe.defineAnonymousClass? Only VM anonymous classes have a "host class". Java level "anonymous classes" are just regular classes.
David -----
This is an example using Guava. I also can reproduce with jdk13. The field after parsing: _nonstatic_oop_map_size = 1, _is_marked_dependent = false, _has_unloaded_dependent = false, _misc_flags = 38, ////// <------------ not set for anonymous _minor_version = 0, _major_version = 50, _init_thread = 0x0, _vtable_len = 8, _itable_len = 8, This path is from a custom loader defining a anonymous class, does not set anonymous correctly for the flag. Is this a bug? If in java land, supply a host as parameter, it can be set correctly in VM part. Should I file a bug for it? Thanks Yumin
