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FastJNI_com_ibm_oti_vm_VM.cpp
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/*******************************************************************************
* Copyright (c) 2001, 2020 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#include "fastJNI.h"
#include "j9protos.h"
#include "j9consts.h"
#include "VMHelpers.hpp"
#include "AtomicSupport.hpp"
extern "C" {
/* java.lang.VMAccess: protected static native Class findClassOrNull(String className, ClassLoader classLoader); */
j9object_t JNICALL
Fast_java_lang_VMAccess_findClassOrNull(J9VMThread *currentThread, j9object_t className, j9object_t classloaderObject)
{
j9object_t classObject = NULL;
if (NULL == className) {
setCurrentException(currentThread, J9VMCONSTANTPOOL_JAVALANGNULLPOINTEREXCEPTION, NULL);
} else {
J9JavaVM *vm = currentThread->javaVM;
J9Class *j9Class = NULL;
J9ClassLoader *loader = NULL;
/* This native is only called for the boot loader, so vmRef is guaranteed to be initialized. */
if (NULL != classloaderObject) {
loader = J9VMJAVALANGCLASSLOADER_VMREF(currentThread, classloaderObject);
} else {
loader = vm->systemClassLoader;
}
j9Class = internalFindClassString(currentThread, NULL, className, loader,
J9_FINDCLASS_FLAG_USE_LOADER_CP_ENTRIES,
CLASSNAME_VALID_NON_ARRARY);
if (VM_VMHelpers::exceptionPending(currentThread)) {
J9Class *exceptionClass = J9VMJAVALANGCLASSNOTFOUNDEXCEPTION(vm);
/* If the current exception is ClassNotFoundException, discard it. */
if (exceptionClass == J9OBJECT_CLAZZ(currentThread, currentThread->currentException)) {
VM_VMHelpers::clearException(currentThread);
}
} else {
classObject = J9VM_J9CLASS_TO_HEAPCLASS(j9Class);
}
}
return classObject;
}
/* com.ibm.oti.vm.VM: public static final native int getClassPathEntryType(java.lang.ClassLoader classLoader, int cpIndex); */
jint JNICALL
Fast_com_ibm_oti_vm_VM_getClassPathEntryType(J9VMThread *currentThread, j9object_t classLoaderObject, jint cpIndex)
{
jint type = CPE_TYPE_UNUSABLE;
/* This native is only called for the boot loader, so vmRef is guaranteed to be initialized */
J9ClassLoader *classLoader = J9VMJAVALANGCLASSLOADER_VMREF(currentThread, classLoaderObject);
/* Bounds check the parameter */
if ((cpIndex >= 0) && (cpIndex < (jint)classLoader->classPathEntryCount)) {
J9JavaVM *vm = currentThread->javaVM;
/* Check the flags of the translation data struct */
J9TranslationBufferSet *translationData = vm->dynamicLoadBuffers;
if (NULL != translationData) {
/* Initialize the class path entry */
J9ClassPathEntry *cpEntry = classLoader->classPathEntries + cpIndex;
type = (jint)initializeClassPathEntry(vm, cpEntry);
}
}
return type;
}
/* com.ibm.oti.vm.VM: protected static native int getCPIndexImpl(Class targetClass); */
jint JNICALL
Fast_com_ibm_oti_vm_VM_getCPIndexImpl(J9VMThread *currentThread, j9object_t targetClass)
{
J9Class *j9clazz = J9VM_J9CLASS_FROM_HEAPCLASS(currentThread, targetClass);
J9JavaVM *vm = currentThread->javaVM;
omrthread_monitor_enter(vm->classLoaderModuleAndLocationMutex);
J9ClassLocation *classLocation = findClassLocationForClass(currentThread, j9clazz);
omrthread_monitor_exit(vm->classLoaderModuleAndLocationMutex);
/* (classLocation->locationType < 0) points to generated classes which don't have location.
* But, their class location has been hacked to properly retrieve package information.
* Such location types must return J9_CP_INDEX_NONE for classpath index.
*/
if ((NULL == classLocation) || (classLocation->locationType < 0)) {
return (jint)J9_CP_INDEX_NONE;
} else {
return (jint)classLocation->entryIndex;
}
}
/* com.ibm.oti.vm.VM: public static final native void initializeClassLoader(ClassLoader classLoader, int loaderType, boolean parallelCapable); */
void JNICALL
Fast_com_ibm_oti_vm_VM_initializeClassLoader(J9VMThread *currentThread, j9object_t classLoaderObject, jint loaderType, jboolean parallelCapable)
{
if (NULL != J9VMJAVALANGCLASSLOADER_VMREF(currentThread, classLoaderObject)) {
internalError:
setCurrentException(currentThread, J9VMCONSTANTPOOL_JAVALANGINTERNALERROR, NULL);
} else {
J9JavaVM *vm = currentThread->javaVM;
if (J9_CLASSLOADER_TYPE_BOOT == loaderType) {
/* if called with bootLoader, assign the system one to this instance */
J9ClassLoader *classLoaderStruct = vm->systemClassLoader;
j9object_t loaderObject = J9CLASSLOADER_CLASSLOADEROBJECT(currentThread, classLoaderStruct);
if (NULL != loaderObject) {
goto internalError;
}
J9CLASSLOADER_SET_CLASSLOADEROBJECT(currentThread, classLoaderStruct, classLoaderObject);
if (parallelCapable) {
classLoaderStruct->flags |= J9CLASSLOADER_PARALLEL_CAPABLE;
}
VM_AtomicSupport::writeBarrier();
J9VMJAVALANGCLASSLOADER_SET_VMREF(currentThread, classLoaderObject, classLoaderStruct);
TRIGGER_J9HOOK_VM_CLASS_LOADER_INITIALIZED(vm->hookInterface, currentThread, classLoaderStruct);
J9ClassWalkState classWalkState;
J9Class* clazz = allClassesStartDo(&classWalkState, vm, classLoaderStruct);
while (NULL != clazz) {
J9VMJAVALANGCLASS_SET_CLASSLOADER(currentThread, clazz->classObject, classLoaderObject);
clazz = allClassesNextDo(&classWalkState);
}
allClassesEndDo(&classWalkState);
} else {
J9ClassLoader *classLoaderStruct = internalAllocateClassLoader(vm, classLoaderObject);
if (J9_CLASSLOADER_TYPE_PLATFORM == loaderType) {
/* extensionClassLoader holds the platform class loader in Java 11+ */
vm->extensionClassLoader = classLoaderStruct;
}
}
}
}
/* com.ibm.oti.vm.VM: static private final native boolean isBootstrapClassLoader(ClassLoader loader); */
jboolean JNICALL
Fast_com_ibm_oti_vm_VM_isBootstrapClassLoader(J9VMThread *currentThread, j9object_t classLoaderObject)
{
jboolean isBoot = JNI_FALSE;
if (NULL == classLoaderObject) {
isBoot = JNI_TRUE;
} else {
J9ClassLoader *loader = J9VMJAVALANGCLASSLOADER_VMREF(currentThread, classLoaderObject);
if (loader == currentThread->javaVM->systemClassLoader) {
isBoot = JNI_TRUE;
}
}
return isBoot;
}
J9_FAST_JNI_METHOD_TABLE(com_ibm_oti_vm_VM)
J9_FAST_JNI_METHOD("findClassOrNull", "(Ljava/lang/String;Ljava/lang/ClassLoader;)Ljava/lang/Class;", Fast_java_lang_VMAccess_findClassOrNull,
J9_FAST_JNI_RETAIN_VM_ACCESS | J9_FAST_JNI_DO_NOT_WRAP_OBJECTS | J9_FAST_JNI_DO_NOT_PASS_RECEIVER)
J9_FAST_JNI_METHOD("getClassPathEntryType", "(Ljava/lang/ClassLoader;I)I", Fast_com_ibm_oti_vm_VM_getClassPathEntryType,
J9_FAST_JNI_RETAIN_VM_ACCESS | J9_FAST_JNI_NOT_GC_POINT | J9_FAST_JNI_NO_NATIVE_METHOD_FRAME | J9_FAST_JNI_NO_EXCEPTION_THROW |
J9_FAST_JNI_NO_SPECIAL_TEAR_DOWN | J9_FAST_JNI_DO_NOT_WRAP_OBJECTS | J9_FAST_JNI_DO_NOT_PASS_RECEIVER)
J9_FAST_JNI_METHOD("getCPIndexImpl", "(Ljava/lang/Class;)I", Fast_com_ibm_oti_vm_VM_getCPIndexImpl,
J9_FAST_JNI_RETAIN_VM_ACCESS | J9_FAST_JNI_NOT_GC_POINT | J9_FAST_JNI_NO_NATIVE_METHOD_FRAME | J9_FAST_JNI_NO_EXCEPTION_THROW |
J9_FAST_JNI_NO_SPECIAL_TEAR_DOWN | J9_FAST_JNI_DO_NOT_WRAP_OBJECTS | J9_FAST_JNI_DO_NOT_PASS_RECEIVER)
J9_FAST_JNI_METHOD("initializeClassLoader", "(Ljava/lang/ClassLoader;IZ)V", Fast_com_ibm_oti_vm_VM_initializeClassLoader,
J9_FAST_JNI_RETAIN_VM_ACCESS | J9_FAST_JNI_DO_NOT_WRAP_OBJECTS | J9_FAST_JNI_DO_NOT_PASS_RECEIVER)
J9_FAST_JNI_METHOD("isBootstrapClassLoader", "(Ljava/lang/ClassLoader;)Z", Fast_com_ibm_oti_vm_VM_isBootstrapClassLoader,
J9_FAST_JNI_RETAIN_VM_ACCESS | J9_FAST_JNI_NOT_GC_POINT | J9_FAST_JNI_NO_NATIVE_METHOD_FRAME | J9_FAST_JNI_NO_EXCEPTION_THROW |
J9_FAST_JNI_NO_SPECIAL_TEAR_DOWN | J9_FAST_JNI_DO_NOT_WRAP_OBJECTS | J9_FAST_JNI_DO_NOT_PASS_RECEIVER)
J9_FAST_JNI_METHOD_TABLE_END
}