hotspot/src/share/vm/prims/jni.cpp
JNI_ENTRY(jobject, jni_GetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID))
{- -------------------------------------------
(1) (デバッグ用の処理)
(See: JNIWrapper)
---------------------------------------- -}
JNIWrapper("GetStaticObjectField");
{- -------------------------------------------
(1) (DTrace のフック点)
---------------------------------------- -}
DTRACE_PROBE3(hotspot_jni, GetStaticObjectField__entry, env, clazz, fieldID);
{- -------------------------------------------
(1) (変数宣言など)
---------------------------------------- -}
#ifndef JNICHECK_KERNEL
DEBUG_ONLY(klassOop param_k = jniCheck::validate_class(thread, clazz);)
#endif // JNICHECK_KERNEL
JNIid* id = jfieldIDWorkaround::from_static_jfieldID(fieldID);
assert(id->is_static_field_id(), "invalid static field id");
{- -------------------------------------------
(1) (JVMTI のフック点)
---------------------------------------- -}
// Keep JVMTI addition small and only check enabled flag here.
// jni_GetField_probe() assumes that is okay to create handles.
if (JvmtiExport::should_post_field_access()) {
JvmtiExport::jni_GetField_probe(thread, NULL, NULL, id->holder(), fieldID, true);
}
{- -------------------------------------------
(1) oopDesc::obj_field() でフィールドの値を取得し, その結果を JNI Handle 化しておく.
---------------------------------------- -}
jobject ret = JNIHandles::make_local(id->holder()->java_mirror()->obj_field(id->offset()));
{- -------------------------------------------
(1) (DTrace のフック点)
---------------------------------------- -}
DTRACE_PROBE1(hotspot_jni, GetStaticObjectField__return, ret);
{- -------------------------------------------
(1) 結果をリターン
---------------------------------------- -}
return ret;
JNI_END
This document is available under the GNU GENERAL PUBLIC LICENSE Version 2.