archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-08-28 15:24:43 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

6642881: Improve performance of Class.getClassLoader()

Browse source 
Add classLoader to java/lang/Class instance for fast access

Reviewed-by: alanb, lfoltan, rriggs, vlivanov, twisti, jfranck
This commit is contained in:
Coleen Phillimore 2014-06-19 14:49:33 -04:00
parent 243d697d71
commit d8ce93cea5
7 changed files with 46 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

10
hotspot/src/share/vm/prims/unsafe.cpp
View file

@ -891,6 +891,14 @@ UNSAFE_ENTRY(jclass, Unsafe_DefineClass(JNIEnv *env, jobject unsafe, jstring nam
}
UNSAFE_END
static jobject get_class_loader(JNIEnv* env, jclass cls) {
if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
return NULL;
}
Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
oop loader = k->class_loader();
return JNIHandles::make_local(env, loader);
}
UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring name, jbyteArray data, int offset, int length))
UnsafeWrapper("Unsafe_DefineClass");
@ -899,7 +907,7 @@ UNSAFE_ENTRY(jclass, Unsafe_DefineClass0(JNIEnv *env, jobject unsafe, jstring na
int depthFromDefineClass0 = 1;
jclass caller = JVM_GetCallerClass(env, depthFromDefineClass0);
jobject loader = (caller == NULL) ? NULL : JVM_GetClassLoader(env, caller);
jobject loader = (caller == NULL) ? NULL : get_class_loader(env, caller);
jobject pd = (caller == NULL) ? NULL : JVM_GetProtectionDomain(env, caller);
return Unsafe_DefineClass_impl(env, name, data, offset, length, loader, pd);