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.
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
