Unsupported event type for jvm method check_class_file_load_hook

[qsLI]

async profiler version

$ ./bin/asprof -v
Async-profiler 3.0 built on Jan 20 2024

trace check_class_file_load_hook

$ ./bin/asprof -e check_class_file_load_hook -d 60 8657
[ERROR] Unsupported event type

gdb says it has this func:

(gdb) i functions check_class_file_load_hook
All functions matching regular expression "check_class_file_load_hook":

File /openjdk/src/hotspot/share/classfile/klassFactory.cpp:
static ClassFileStream *check_class_file_load_hook(ClassFileStream*, Symbol*, ClassLoaderData*, Handle, JvmtiCachedClassFileData**, JavaThread*);

nm output

$ nm /openjdk/build/linux-x86_64-server-slowdebug/jdk/lib/server/libjvm.so | grep check_class_file_load_hook
0000000000d94166 t _ZL26check_class_file_load_hookP15ClassFileStreamP6SymbolP15ClassLoaderData6HandlePP24JvmtiCachedClassFileDataP10JavaThread

jvm source code:

static ClassFileStream* check_class_file_load_hook(ClassFileStream* stream,
                                                   Symbol* name,
                                                   ClassLoaderData* loader_data,
                                                   Handle protection_domain,
                                                   JvmtiCachedClassFileData** cached_class_file,
                                                   TRAPS) {

[apangin]

As you've found with nm, the full (unmangled) symbol name is

_ZL26check_class_file_load_hookP15ClassFileStreamP6SymbolP15ClassLoaderData6HandlePP24JvmtiCachedClassFileDataP10JavaThread

If you use this one with -e, it should work.

You don't need to specify the full name though: a prefix with a star should do the trick:

-e '_ZL26check_class_file_load_hook*'

Async-profiler does not mangle C++ function names automatically, except for simple cases like G1CollectedHeap::humongous_obj_allocate

[qsLI]

As you've found with nm, the full (unmangled) symbol name is

_ZL26check_class_file_load_hookP15ClassFileStreamP6SymbolP15ClassLoaderData6HandlePP24JvmtiCachedClassFileDataP10JavaThread

If you use this one with -e, it should work.

You don't need to specify the full name though: a prefix with a star should do the trick:

-e '_ZL26check_class_file_load_hook*'

Async-profiler does not mangle C++ function names automatically, except for simple cases like G1CollectedHeap::humongous_obj_allocate

It works! Appreciate.