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8291360: Create entry points to expose low-level class file information

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Reviewed-by: dholmes, rriggs
This commit is contained in:
Harold Seigel 2022-08-04 13:13:01 +00:00
parent ce61eb6ff9
commit a3040fcc2b
9 changed files with 812 additions and 1 deletions
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19
src/hotspot/share/prims/jvm.cpp
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@ -4044,3 +4044,22 @@ JVM_ENTRY(void, JVM_VirtualThreadUnmountEnd(JNIEnv* env, jobject vthread, jboole
fatal("Should only be called with JVMTI enabled");
#endif
JVM_END
/*
* Return the current class's class file version. The low order 16 bits of the
* returned jint contain the class's major version. The high order 16 bits
* contain the class's minor version.
*/
JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
oop mirror = JNIHandles::resolve_non_null(current);
if (java_lang_Class::is_primitive(mirror)) {
// return latest major version and minor version of 0.
return JVM_CLASSFILE_MAJOR_VERSION;
}
assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
Klass* c = java_lang_Class::as_Klass(mirror);
assert(c->is_instance_klass(), "must be");
InstanceKlass* ik = InstanceKlass::cast(c);
return (ik->minor_version() << 16) | ik->major_version();
JVM_END