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jvmtiClass.c
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/*******************************************************************************
* Copyright (c) 1991, 2021 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 "jvmtiHelpers.h"
#include "jvmti_internal.h"
typedef struct J9JVMTIClassStats {
J9JavaVM * vm;
J9VMThread * currentThread;
jint classCount;
jclass * classRefs;
} J9JVMTIClassStats;
#define ENSURE_CLASS_PRIMITIVE_ARRAY_OR_PREPARED(clazz) \
do { \
if (J9ROMCLASS_IS_PRIMITIVE_OR_ARRAY((clazz)->romClass) == 0) { \
if ((getClassStatus(clazz) & JVMTI_CLASS_STATUS_PREPARED) == 0) { \
JVMTI_ERROR(JVMTI_ERROR_CLASS_NOT_PREPARED); \
} \
} \
} while(0)
/* Static J9UTF8's used to for MethodHandle.invokeExact/invoke methods */
#define DECLARE_CLASSNAME_LIST_DATA(instanceName, name) \
static const struct { \
U_16 length; \
U_8 data[sizeof(name) - 1]; \
} instanceName = { sizeof(name) - 1, name }
DECLARE_CLASSNAME_LIST_DATA(MH_invokeExact_utf, "invokeExact");
DECLARE_CLASSNAME_LIST_DATA(MH_invoke_utf, "invoke");
DECLARE_CLASSNAME_LIST_DATA(MH_methodHandle_utf, "java.lang.invoke.MethodHandle");
static jvmtiError redefineClassesCommon(jvmtiEnv* env, jint class_count, const jvmtiClassDefinition* class_definitions, J9VMThread * currentThread, UDATA options);
static void restoreBreakpointsInClasses (J9VMThread * currentThread, J9HashTable* classHashTable);
static void clearBreakpointsInClasses (J9VMThread * currentThread, J9HashTable* classHashTable);
static jint getClassStatus (J9Class * clazz);
static UDATA countInitiatedClass (J9Class * clazz, J9JVMTIClassStats * results);
static UDATA copyInitiatedClass (J9Class * clazz, J9JVMTIClassStats * results);
static UDATA jvmtiGetConstantPool_HashFn(void *entry, void *userData);
static UDATA jvmtiGetConstantPool_HashEqualFn(void *lhsEntry, void *rhsEntry, void *userData);
static jvmtiError jvmtiGetConstantPool_writeConstants(jvmtiGcp_translation *translation, unsigned char *constantPoolBuf);
static jvmtiError jvmtiGetConstantPool_addNAS(jvmtiGcp_translation *translation, J9ROMNameAndSignature *nas, U_32 *sunCpIndex, U_32 *refIndex);
static jvmtiError jvmtiGetConstantPool_addReference(jvmtiGcp_translation *translation, UDATA cpIndex, U_8 cpType, J9ROMFieldRef *ref, U_32 *sunCpIndex);
static jvmtiError jvmtiGetConstantPool_addUTF8(jvmtiGcp_translation *translation, J9UTF8 *utf8, U_32 *sunCpIndex, U_32 *refIndex);
static jvmtiError jvmtiGetConstantPool_addClassOrString(jvmtiGcp_translation *translation, UDATA cpIndex, U_8 cpType, J9UTF8 *utf8, U_32 *sunCpIndex, U_32 *refIndex);
static jvmtiError jvmtiGetConstantPool_addIntFloat(jvmtiGcp_translation *translation, UDATA cpIndex, U_8 cpType, U_32 data, U_32 *sunCpIndex);
static jvmtiError jvmtiGetConstantPool_addLongDouble(jvmtiGcp_translation *translation, UDATA cpIndex, U_8 cpType, U_32 slot1, U_32 slot2, U_32 *sunCpIndex);
static jvmtiError jvmtiGetConstantPool_addMethodHandle(jvmtiGcp_translation *translation, UDATA cpIndex, U_8 cpType, J9ROMMethodHandleRef *ref, U_32 *sunCpIndex);
static jvmtiError jvmtiGetConstantPool_addMethodType(jvmtiGcp_translation *translation, UDATA cpIndex, U_8 cpType, J9ROMMethodTypeRef *ref, U_32 *sunCpIndex);
static jvmtiError jvmtiGetConstantPool_addNAS_name_sig(jvmtiGcp_translation *translation, void * key, J9UTF8 *name, J9UTF8* sig, U_32 *sunCpIndex, U_32 *refIndex);
static jvmtiError jvmtiGetConstantPool_addInvokeDynamic(jvmtiGcp_translation *translation, UDATA key, J9ROMNameAndSignature *nameAndSig, U_32 bsmIndex, U_32 *sunCpIndex);
/**
* \brief Get the count of loaded classes
*
* @param[in] vm
* @return Count of loaded classes
*
* Assumes caller acquired classTableMutex
*/
static jint
jvmtiGetLoadedClassesCount(J9JavaVM * vm)
{
J9InternalVMFunctions const * const vmfuncs = vm->internalVMFunctions;
J9ClassWalkState classWalkState;
jint classCount = 0;
J9Class *clazz = NULL;
/* Count classes (ignore primitive types and old versions of redefined classes) */
clazz = vmfuncs->allLiveClassesStartDo(&classWalkState, vm, NULL);
while (clazz) {
if (J9ROMCLASS_IS_PRIMITIVE_TYPE(clazz->romClass) == 0) {
if ((J9CLASS_FLAGS(clazz) & J9AccClassHotSwappedOut) == 0) {
classCount++;
}
}
clazz = vmfuncs->allLiveClassesNextDo(&classWalkState);
}
vmfuncs->allLiveClassesEndDo(&classWalkState);
return classCount;
}
jvmtiError JNICALL
jvmtiGetLoadedClasses(jvmtiEnv* env,
jint* class_count_ptr,
jclass** classes_ptr)
{
J9JVMTIData * jvmtiData = J9JVMTI_DATA_FROM_ENV(env);
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
J9VMThread * currentThread;
jclass * classRefs = NULL;
jvmtiError rc;
PORT_ACCESS_FROM_JAVAVM(vm);
jclass *rv_classes = NULL;
jint rv_class_count = 0;
J9InternalVMFunctions const * const vmfuncs = vm->internalVMFunctions;
Trc_JVMTI_jvmtiGetLoadedClasses_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
J9ClassWalkState classWalkState;
jint lastClassCount;
J9Class *clazz;
vmfuncs->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_LIVE(env);
ENSURE_NON_NULL(class_count_ptr);
ENSURE_NON_NULL(classes_ptr);
omrthread_monitor_enter(vm->classTableMutex);
lastClassCount = (jint) jvmtiData->lastClassCount;
if (lastClassCount == 0) {
lastClassCount = jvmtiGetLoadedClassesCount(vm);
}
classRefs = j9mem_allocate_memory(lastClassCount * sizeof(jclass), J9MEM_CATEGORY_JVMTI_ALLOCATE);
if (classRefs == NULL) {
rc = JVMTI_ERROR_OUT_OF_MEMORY;
} else {
jint i = 0;
/* Copy class references (ignore primitive types and old versions of redefined classes) */
clazz = vmfuncs->allLiveClassesStartDo(&classWalkState, vm, NULL);
while (clazz) {
/* Check if we need more memory */
if (i == lastClassCount) {
jclass * tempClassRefs;
lastClassCount = lastClassCount + 128;
tempClassRefs = j9mem_reallocate_memory(classRefs, lastClassCount * sizeof(jclass), J9MEM_CATEGORY_JVMTI);
if (NULL == tempClassRefs) {
/* realloc failed - need to free the original allocation */
j9mem_free_memory(classRefs);
classRefs = NULL;
vmfuncs->allLiveClassesEndDo(&classWalkState);
omrthread_monitor_exit(vm->classTableMutex);
rc = JVMTI_ERROR_OUT_OF_MEMORY;
goto done;
}
classRefs = tempClassRefs;
}
if (J9ROMCLASS_IS_PRIMITIVE_TYPE(clazz->romClass) == 0) {
if ((J9CLASS_FLAGS(clazz) & J9AccClassHotSwappedOut) == 0) {
classRefs[i++] = (jclass)vmfuncs->j9jni_createLocalRef((JNIEnv *) currentThread, J9VM_J9CLASS_TO_HEAPCLASS(clazz));
}
}
clazz = vmfuncs->allLiveClassesNextDo(&classWalkState);
}
vmfuncs->allLiveClassesEndDo(&classWalkState);
jvmtiData->lastClassCount = (UDATA) i;
rv_class_count = i;
rv_classes = classRefs;
}
omrthread_monitor_exit(vm->classTableMutex);
done:
vmfuncs->internalExitVMToJNI(currentThread);
}
if (NULL != class_count_ptr) {
*class_count_ptr = rv_class_count;
}
if (NULL != classes_ptr) {
*classes_ptr = rv_classes;
}
TRACE_JVMTI_RETURN(jvmtiGetLoadedClasses);
}
jvmtiError JNICALL
jvmtiGetClassLoaderClasses(jvmtiEnv* env,
jobject initiating_loader,
jint* class_count_ptr,
jclass** classes_ptr)
{
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
J9VMThread * currentThread = NULL;
jvmtiError rc = JVMTI_ERROR_NONE;
jint rv_class_count = 0;
jclass *rv_classes = NULL;
Trc_JVMTI_jvmtiGetClassLoaderClasses_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
J9InternalVMFunctions const * const vmFuncs = vm->internalVMFunctions;
J9ClassLoader *loader = NULL;
J9Class *clazz = NULL;
PORT_ACCESS_FROM_JAVAVM(vm);
J9JVMTIClassStats stats = {0};
J9HashTableState hashWalkState = {0};
J9Class **primitiveArray = NULL;
vmFuncs->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_LIVE(env);
ENSURE_NON_NULL(class_count_ptr);
ENSURE_NON_NULL(classes_ptr);
/* NULL means to use the boot loader */
if (initiating_loader == NULL) {
loader = vm->systemClassLoader;
} else {
loader = J9VMJAVALANGCLASSLOADER_VMREF(currentThread, J9_JNI_UNWRAP_REFERENCE(initiating_loader));
if (NULL == loader) {
goto done;
}
}
omrthread_monitor_enter(vm->classTableMutex);
stats.vm = vm;
stats.currentThread = currentThread;
/* Search for classes who have this class loader as the initiating loader (wind up count) */
clazz = vmFuncs->hashClassTableStartDo(loader, &hashWalkState, J9_HASH_TABLE_STATE_FLAG_SKIP_HIDDEN);
while (clazz != NULL) {
countInitiatedClass(clazz, &stats);
clazz = vmFuncs->hashClassTableNextDo(&hashWalkState);
}
/* The base type primitive array classes must also be added */
primitiveArray = &vm->booleanArrayClass;
do {
countInitiatedClass(*primitiveArray, &stats);
primitiveArray += 1;
} while (primitiveArray <= &vm->longArrayClass);
stats.classRefs = j9mem_allocate_memory(stats.classCount * sizeof(jclass), J9MEM_CATEGORY_JVMTI_ALLOCATE);
if (stats.classRefs == NULL) {
rc = JVMTI_ERROR_OUT_OF_MEMORY;
} else {
/* Save count before it gets modified below... */
rv_class_count = (jint) stats.classCount;
rv_classes = stats.classRefs;
/* Record classes who have this class loader as the initiating loader (wind down count) */
clazz = vmFuncs->hashClassTableStartDo(loader, &hashWalkState, J9_HASH_TABLE_STATE_FLAG_SKIP_HIDDEN);
while (clazz != NULL) {
copyInitiatedClass(clazz, &stats);
clazz = vmFuncs->hashClassTableNextDo(&hashWalkState);
}
/* The base type primitive array classes must also be added */
primitiveArray = &vm->booleanArrayClass;
do {
copyInitiatedClass(*primitiveArray, &stats);
primitiveArray += 1;
} while (primitiveArray <= &vm->longArrayClass);
}
omrthread_monitor_exit(vm->classTableMutex);
done:
vmFuncs->internalExitVMToJNI(currentThread);
}
if (NULL != class_count_ptr) {
*class_count_ptr = rv_class_count;
}
if (NULL != classes_ptr) {
*classes_ptr = rv_classes;
}
TRACE_JVMTI_RETURN(jvmtiGetClassLoaderClasses);
}
jvmtiError JNICALL
jvmtiGetClassSignature(jvmtiEnv* env,
jclass klass,
char** signature_ptr,
char** generic_ptr)
{
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
jvmtiError rc;
J9VMThread * currentThread;
char * signature = NULL;
char * generic = NULL;
PORT_ACCESS_FROM_JAVAVM(vm);
char *rv_signature = NULL;
char *rv_generic = NULL;
Trc_JVMTI_jvmtiGetClassSignature_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
J9Class * clazz;
vm->internalVMFunctions->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_START_OR_LIVE(env);
ENSURE_JCLASS_NON_NULL(klass);
clazz = J9VM_J9CLASS_FROM_JCLASS(currentThread, klass);
/* Get signature if requested */
if (signature_ptr != NULL) {
if (J9ROMCLASS_IS_PRIMITIVE_TYPE(clazz->romClass)) {
signature = j9mem_allocate_memory(2, J9MEM_CATEGORY_JVMTI_ALLOCATE);
if (signature == NULL) {
rc = JVMTI_ERROR_OUT_OF_MEMORY;
goto done;
}
signature[0] = (clazz->arrayClass == NULL) ? 'V' : J9UTF8_DATA(J9ROMCLASS_CLASSNAME(clazz->arrayClass->romClass))[1];
signature[1] = '\0';
} else if (J9ROMCLASS_IS_ARRAY(clazz->romClass)) {
J9ArrayClass * arrayClass = (J9ArrayClass *) clazz;
J9Class * leafType = arrayClass->leafComponentType;
UDATA arity = arrayClass->arity;
UDATA allocSize = arity;
J9UTF8 * utf;
UDATA utfLength;
if (J9ROMCLASS_IS_PRIMITIVE_TYPE(leafType->romClass)) {
allocSize += 1; /* +1 or primitive sig char */
} else {
utf = J9ROMCLASS_CLASSNAME(leafType->romClass);
utfLength = J9UTF8_LENGTH(utf);
allocSize += (utfLength + 2); /* +2 for L and ; */
}
signature = j9mem_allocate_memory(allocSize + 1, J9MEM_CATEGORY_JVMTI_ALLOCATE);
if (signature == NULL) {
rc = JVMTI_ERROR_OUT_OF_MEMORY;
goto done;
}
memset(signature, '[', arity);
if (J9ROMCLASS_IS_PRIMITIVE_TYPE(leafType->romClass)) {
signature[arrayClass->arity] = J9UTF8_DATA(J9ROMCLASS_CLASSNAME(leafType->arrayClass->romClass))[1];
} else {
J9UTF8 * utf = J9ROMCLASS_CLASSNAME(leafType->romClass);
UDATA utfLength = J9UTF8_LENGTH(utf);
signature[arity] = 'L';
memcpy(signature + arity + 1, J9UTF8_DATA(utf), utfLength);
signature[allocSize - 1] = ';';
}
signature[allocSize] = '\0';
} else {
J9UTF8 * utf = J9ROMCLASS_CLASSNAME(clazz->romClass);
UDATA utfLength = J9UTF8_LENGTH(utf);
signature = j9mem_allocate_memory(utfLength + 3, J9MEM_CATEGORY_JVMTI_ALLOCATE);
if (signature == NULL) {
rc = JVMTI_ERROR_OUT_OF_MEMORY;
goto done;
}
signature[0] = 'L';
memcpy(signature + 1, J9UTF8_DATA(utf), utfLength);
signature[utfLength + 1] = ';';
signature[utfLength + 2] = '\0';
}
}
/* Get generic signature if requested */
if (generic_ptr != NULL) {
J9UTF8 * genericSignature = getGenericSignatureForROMClass(vm, clazz->classLoader, clazz->romClass);
if (genericSignature != NULL) {
rc = cStringFromUTF(env, genericSignature, &generic);
releaseOptInfoBuffer(vm, clazz->romClass);
if (rc != JVMTI_ERROR_NONE) {
goto done;
}
}
}
rv_signature = signature;
rv_generic = generic;
done:
vm->internalVMFunctions->internalExitVMToJNI(currentThread);
}
if (rc != JVMTI_ERROR_NONE) {
j9mem_free_memory(signature);
j9mem_free_memory(generic);
}
if (NULL != signature_ptr) {
*signature_ptr = rv_signature;
}
if (NULL != generic_ptr) {
*generic_ptr = rv_generic;
}
TRACE_JVMTI_RETURN(jvmtiGetClassSignature);
}
jvmtiError JNICALL
jvmtiGetClassStatus(jvmtiEnv* env,
jclass klass,
jint* status_ptr)
{
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
jvmtiError rc;
J9VMThread * currentThread;
jint rv_status = JVMTI_CLASS_STATUS_ERROR;
Trc_JVMTI_jvmtiGetClassStatus_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
J9Class* clazz;
vm->internalVMFunctions->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_START_OR_LIVE(env);
ENSURE_JCLASS_NON_NULL(klass);
ENSURE_NON_NULL(status_ptr);
clazz = J9VM_J9CLASS_FROM_JCLASS(currentThread, klass);
rv_status = getClassStatus(clazz);
done:
vm->internalVMFunctions->internalExitVMToJNI(currentThread);
}
if (NULL != status_ptr) {
*status_ptr = rv_status;
}
TRACE_JVMTI_RETURN(jvmtiGetClassStatus);
}
jvmtiError JNICALL
jvmtiGetSourceFileName(jvmtiEnv* env,
jclass klass,
char** source_name_ptr)
{
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
jvmtiError rc;
J9VMThread * currentThread;
char *rv_source_name = NULL;
Trc_JVMTI_jvmtiGetSourceFileName_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
J9UTF8 *sourceFileName;
J9Class* clazz;
vm->internalVMFunctions->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_START_OR_LIVE(env);
ENSURE_CAPABILITY(env, can_get_source_file_name);
ENSURE_JCLASS_NON_NULL(klass);
ENSURE_NON_NULL(source_name_ptr);
/* Assume that having the capability means that the debug info server is active */
clazz = J9VM_J9CLASS_FROM_JCLASS(currentThread, klass);
rc = JVMTI_ERROR_ABSENT_INFORMATION;
sourceFileName = getSourceFileNameForROMClass(vm, clazz->classLoader, clazz->romClass);
if (sourceFileName != NULL) {
rc = cStringFromUTF(env, sourceFileName, &rv_source_name);
releaseOptInfoBuffer(vm, clazz->romClass);
}
done:
vm->internalVMFunctions->internalExitVMToJNI(currentThread);
}
if (NULL != source_name_ptr) {
*source_name_ptr = rv_source_name;
}
TRACE_JVMTI_RETURN(jvmtiGetSourceFileName);
}
jvmtiError JNICALL
jvmtiGetClassModifiers(jvmtiEnv* env,
jclass klass,
jint* modifiers_ptr)
{
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
jvmtiError rc;
J9VMThread * currentThread;
jint rv_modifiers = 0;
Trc_JVMTI_jvmtiGetClassModifiers_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
J9Class * clazz;
J9ROMClass * romClass;
U_32 modifiers;
vm->internalVMFunctions->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_START_OR_LIVE(env);
ENSURE_JCLASS_NON_NULL(klass);
ENSURE_NON_NULL(modifiers_ptr);
/* Primitive classes have the correct modifiers, so no special processing needs to be done */
clazz = J9VM_J9CLASS_FROM_JCLASS(currentThread, klass);
romClass = clazz->romClass;
/* Array classes have the modifiers of their leaf component type */
if (J9ROMCLASS_IS_ARRAY(romClass)) {
clazz = ((J9ArrayClass *) clazz)->leafComponentType;
}
/* Inner classes use the memberAccessFlags instead of the modifiers */
modifiers = J9_ARE_NO_BITS_SET(clazz->romClass->extraModifiers, J9AccClassInnerClass)
? clazz->romClass->modifiers
: clazz->romClass->memberAccessFlags;
/* Array classes must always be final and not interface */
if (J9ROMCLASS_IS_ARRAY(romClass)) {
modifiers = (modifiers | J9AccFinal) & ~J9AccInterface;
}
/* Only the low 16 bit of the modifiers are specified - the rest are J9 internal */
rv_modifiers = (jint) (modifiers & 0xFFFF);
done:
vm->internalVMFunctions->internalExitVMToJNI(currentThread);
}
if (NULL != modifiers_ptr) {
*modifiers_ptr = rv_modifiers;
}
TRACE_JVMTI_RETURN(jvmtiGetClassModifiers);
}
jvmtiError JNICALL
jvmtiGetClassMethods(jvmtiEnv* env,
jclass klass,
jint* method_count_ptr,
jmethodID** methods_ptr)
{
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
jvmtiError rc;
J9VMThread * currentThread;
PORT_ACCESS_FROM_JAVAVM(vm);
jint rv_method_count = 0;
jmethodID *rv_methods = NULL;
Trc_JVMTI_jvmtiGetClassMethods_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
J9Class * clazz;
UDATA methodCount;
jmethodID * methodIDs;
vm->internalVMFunctions->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_START_OR_LIVE(env);
ENSURE_JCLASS_NON_NULL(klass);
ENSURE_NON_NULL(method_count_ptr);
ENSURE_NON_NULL(methods_ptr);
clazz = J9VM_J9CLASS_FROM_JCLASS(currentThread, klass);
ENSURE_CLASS_PRIMITIVE_ARRAY_OR_PREPARED(clazz);
methodCount = clazz->romClass->romMethodCount;
methodIDs = j9mem_allocate_memory(methodCount * sizeof(jmethodID), J9MEM_CATEGORY_JVMTI_ALLOCATE);
if (methodIDs == NULL) {
rc = JVMTI_ERROR_OUT_OF_MEMORY;
} else {
J9Method * methods = clazz->ramMethods;
UDATA i;
for (i = 0; i < methodCount; ++i) {
J9Method * method;
J9JNIMethodID * methodID;
method = &(methods[i]);
methodID = vm->internalVMFunctions->getJNIMethodID(currentThread, method);
if (methodID == NULL) {
rc = JVMTI_ERROR_OUT_OF_MEMORY;
j9mem_free_memory(methodIDs);
goto done;
}
methodIDs[i] = (jmethodID) methodID;
}
rv_method_count = (jint) methodCount;
rv_methods = methodIDs;
}
done:
vm->internalVMFunctions->internalExitVMToJNI(currentThread);
}
if (NULL != method_count_ptr) {
*method_count_ptr = rv_method_count;
}
if (NULL != methods_ptr) {
*methods_ptr = rv_methods;
}
TRACE_JVMTI_RETURN(jvmtiGetClassMethods);
}
jvmtiError JNICALL
jvmtiGetClassFields(jvmtiEnv* env,
jclass klass,
jint* field_count_ptr,
jfieldID** fields_ptr)
{
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
jvmtiError rc;
J9VMThread * currentThread;
PORT_ACCESS_FROM_JAVAVM(vm);
jint rv_field_count = 0;
jfieldID *rv_fields = NULL;
Trc_JVMTI_jvmtiGetClassFields_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
const J9InternalVMFunctions *vmFuncs = vm->internalVMFunctions;
J9Class * clazz;
J9ROMClass * romClass;
UDATA fieldCount;
jfieldID * fieldIDs;
vmFuncs->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_START_OR_LIVE(env);
ENSURE_JCLASS_NON_NULL(klass);
ENSURE_NON_NULL(field_count_ptr);
ENSURE_NON_NULL(fields_ptr);
clazz = J9VM_J9CLASS_FROM_JCLASS(currentThread, klass);
ENSURE_CLASS_PRIMITIVE_ARRAY_OR_PREPARED(clazz);
romClass = clazz->romClass;
fieldCount = romClass->romFieldCount;
fieldIDs = j9mem_allocate_memory(fieldCount * sizeof(jfieldID), J9MEM_CATEGORY_JVMTI_ALLOCATE);
if (fieldIDs == NULL) {
rc = JVMTI_ERROR_OUT_OF_MEMORY;
} else {
J9ROMFieldOffsetWalkState state;
J9ROMFieldOffsetWalkResult * result;
UDATA i;
i = 0;
#if defined(J9VM_OPT_VALHALLA_VALUE_TYPES)
result = vmFuncs->fieldOffsetsStartDo(vm, romClass, GET_SUPERCLASS(clazz), &state,
J9VM_FIELD_OFFSET_WALK_INCLUDE_STATIC | J9VM_FIELD_OFFSET_WALK_INCLUDE_INSTANCE, clazz->flattenedClassCache);
#else /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
result = vmFuncs->fieldOffsetsStartDo(vm, romClass, GET_SUPERCLASS(clazz), &state,
J9VM_FIELD_OFFSET_WALK_INCLUDE_STATIC | J9VM_FIELD_OFFSET_WALK_INCLUDE_INSTANCE );
#endif /* defined(J9VM_OPT_VALHALLA_VALUE_TYPES) */
while (NULL != result->field) {
UDATA inconsistentData = 0;
J9JNIFieldID * fieldID = vmFuncs->getJNIFieldID(currentThread, clazz, result->field, result->offset, &inconsistentData);
/* vmaccess isn't given up so the J9ROMFieldShape and clazz->romClass must be consistent here */
Assert_JVMTI_true(0 == inconsistentData);
if (fieldID == NULL) {
rc = JVMTI_ERROR_OUT_OF_MEMORY;
j9mem_free_memory(fieldIDs);
goto done;
}
fieldIDs[i++] = (jfieldID) fieldID;
result = vmFuncs->fieldOffsetsNextDo(&state);
}
rv_field_count = (jint) fieldCount;
rv_fields = fieldIDs;
}
done:
vmFuncs->internalExitVMToJNI(currentThread);
}
*field_count_ptr = rv_field_count;
*fields_ptr = rv_fields;
TRACE_JVMTI_RETURN(jvmtiGetClassFields);
}
jvmtiError JNICALL
jvmtiGetImplementedInterfaces(jvmtiEnv* env,
jclass klass,
jint* interface_count_ptr,
jclass** interfaces_ptr)
{
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
jvmtiError rc;
J9VMThread * currentThread;
PORT_ACCESS_FROM_JAVAVM(vm);
jint rv_interface_count = 0;
jclass *rv_interfaces = NULL;
Trc_JVMTI_jvmtiGetImplementedInterfaces_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
J9Class * clazz;
J9ROMClass * romClass;
jint interfaceCount = 0;
jclass * interfaces = NULL;
vm->internalVMFunctions->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_START_OR_LIVE(env);
ENSURE_JCLASS_NON_NULL(klass);
ENSURE_NON_NULL(interface_count_ptr);
ENSURE_NON_NULL(interfaces_ptr);
clazz = J9VM_J9CLASS_FROM_JCLASS(currentThread, klass);
ENSURE_CLASS_PRIMITIVE_ARRAY_OR_PREPARED(clazz);
romClass = clazz->romClass;
/* Array and primitive classes must return an empty list */
if (!J9ROMCLASS_IS_PRIMITIVE_OR_ARRAY(romClass)) {
/* Must walk the interface names in the ROM class to be sure to get the whole list */
interfaceCount = (jint) romClass->interfaceCount;
interfaces = j9mem_allocate_memory(interfaceCount * sizeof(jclass), J9MEM_CATEGORY_JVMTI_ALLOCATE);
if (interfaces == NULL) {
rc = JVMTI_ERROR_OUT_OF_MEMORY;
} else {
J9SRP * interfaceNames = J9ROMCLASS_INTERFACES(romClass);
jint i;
for (i = 0; i < interfaceCount; i++) {
J9Class * interfaceClass;
J9UTF8 * interfaceName = SRP_PTR_GET(&interfaceNames[i], J9UTF8 *);
/* The interfaces for this class are guaranteed to already be loaded */
interfaceClass = vm->internalVMFunctions->internalFindClassUTF8(currentThread, J9UTF8_DATA(interfaceName), J9UTF8_LENGTH(interfaceName),
clazz->classLoader, J9_FINDCLASS_FLAG_EXISTING_ONLY);
interfaces[i] = (jclass) vm->internalVMFunctions->j9jni_createLocalRef((JNIEnv *) currentThread, J9VM_J9CLASS_TO_HEAPCLASS(interfaceClass));
}
}
}
rv_interface_count = interfaceCount;
rv_interfaces = interfaces;
done:
vm->internalVMFunctions->internalExitVMToJNI(currentThread);
}
if (NULL != interface_count_ptr) {
*interface_count_ptr = rv_interface_count;
}
if (NULL != interfaces_ptr) {
*interfaces_ptr = rv_interfaces;
}
TRACE_JVMTI_RETURN(jvmtiGetImplementedInterfaces);
}
jvmtiError JNICALL
jvmtiIsInterface(jvmtiEnv* env,
jclass klass,
jboolean* is_interface_ptr)
{
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
jvmtiError rc;
J9VMThread * currentThread;
jboolean rv_is_interface = JNI_FALSE;
Trc_JVMTI_jvmtiIsInterface_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
J9Class * clazz;
vm->internalVMFunctions->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_START_OR_LIVE(env);
ENSURE_JCLASS_NON_NULL(klass);
ENSURE_NON_NULL(is_interface_ptr);
clazz = J9VM_J9CLASS_FROM_JCLASS(currentThread, klass);
rv_is_interface = (clazz->romClass->modifiers & J9AccInterface) ? JNI_TRUE : JNI_FALSE;
done:
vm->internalVMFunctions->internalExitVMToJNI(currentThread);
}
if (NULL != is_interface_ptr) {
*is_interface_ptr = rv_is_interface;
}
TRACE_JVMTI_RETURN(jvmtiIsInterface);
}
jvmtiError JNICALL
jvmtiIsArrayClass(jvmtiEnv* env,
jclass klass,
jboolean* is_array_class_ptr)
{
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
jvmtiError rc;
J9VMThread * currentThread;
jboolean rv_is_array_class = JNI_FALSE;
Trc_JVMTI_jvmtiIsArrayClass_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
J9Class * clazz;
vm->internalVMFunctions->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_START_OR_LIVE(env);
ENSURE_JCLASS_NON_NULL(klass);
ENSURE_NON_NULL(is_array_class_ptr);
clazz = J9VM_J9CLASS_FROM_JCLASS(currentThread, klass);
rv_is_array_class = (J9ROMCLASS_IS_ARRAY(clazz->romClass)) ? JNI_TRUE : JNI_FALSE;
done:
vm->internalVMFunctions->internalExitVMToJNI(currentThread);
}
if (NULL != is_array_class_ptr) {
*is_array_class_ptr = rv_is_array_class;
}
TRACE_JVMTI_RETURN(jvmtiIsArrayClass);
}
jvmtiError JNICALL
jvmtiGetClassLoader(jvmtiEnv* env,
jclass klass,
jobject* classloader_ptr)
{
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
jvmtiError rc;
J9VMThread * currentThread;
jobject rv_classloader = NULL;
Trc_JVMTI_jvmtiGetClassLoader_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
J9Class * clazz;
J9ClassLoader * classLoader;
vm->internalVMFunctions->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_START_OR_LIVE(env);
ENSURE_JCLASS_NON_NULL(klass);
ENSURE_NON_NULL(classloader_ptr);
clazz = J9VM_J9CLASS_FROM_JCLASS(currentThread, klass);
classLoader = clazz->classLoader;
if (classLoader == vm->systemClassLoader) {
rv_classloader = NULL;
} else {
rv_classloader = vm->internalVMFunctions->j9jni_createLocalRef((JNIEnv *)currentThread, J9CLASSLOADER_CLASSLOADEROBJECT(currentThread, classLoader));
}
done:
vm->internalVMFunctions->internalExitVMToJNI(currentThread);
}
if (NULL != classloader_ptr) {
*classloader_ptr = rv_classloader;
}
TRACE_JVMTI_RETURN(jvmtiGetClassLoader);
}
jvmtiError JNICALL
jvmtiGetSourceDebugExtension(jvmtiEnv* env,
jclass klass,
char** source_debug_extension_ptr)
{
jvmtiError rc;
#if defined(J9VM_OPT_DEBUG_JSR45_SUPPORT)
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
J9VMThread * currentThread;
char *rv_source_debug_extension = NULL;
Trc_JVMTI_jvmtiGetSourceDebugExtension_Entry(env);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
J9SourceDebugExtension * sourceDebugExtension;
J9Class* clazz;
vm->internalVMFunctions->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_START_OR_LIVE(env);
ENSURE_CAPABILITY(env, can_get_source_debug_extension);
ENSURE_JCLASS_NON_NULL(klass);
ENSURE_NON_NULL(source_debug_extension_ptr);
/* Assume that having the capability means that the debug info server is active */
rc = JVMTI_ERROR_ABSENT_INFORMATION;
clazz = J9VM_J9CLASS_FROM_JCLASS(currentThread, klass);
sourceDebugExtension = getSourceDebugExtensionForROMClass(vm, clazz->classLoader, clazz->romClass);
if (sourceDebugExtension != NULL) {
U_32 length = sourceDebugExtension->size;
if (length != 0) {
rc = cStringFromUTFChars(env, (U_8 *) (sourceDebugExtension + 1), length, &rv_source_debug_extension);
}
releaseOptInfoBuffer(vm, clazz->romClass);
}
done:
vm->internalVMFunctions->internalExitVMToJNI(currentThread);
}
#else
Trc_JVMTI_jvmtiGetSourceDebugExtension_Entry(env);
rc = JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
#endif
if (NULL != source_debug_extension_ptr) {
*source_debug_extension_ptr = rv_source_debug_extension;
}
TRACE_JVMTI_RETURN(jvmtiGetSourceDebugExtension);
}
jvmtiError JNICALL
jvmtiRedefineClasses(jvmtiEnv* env,
jint class_count,
const jvmtiClassDefinition* class_definitions)
{
J9JavaVM * vm = JAVAVM_FROM_ENV(env);
jvmtiError rc;
J9VMThread * currentThread;
J9JVMTIData * jvmtiData = J9JVMTI_DATA_FROM_VM(vm);
Trc_JVMTI_jvmtiRedefineClasses_Entry(env);
omrthread_monitor_enter(jvmtiData->redefineMutex);
rc = getCurrentVMThread(vm, ¤tThread);
if (rc == JVMTI_ERROR_NONE) {
vm->internalVMFunctions->internalEnterVMFromJNI(currentThread);
ENSURE_PHASE_LIVE(env);
ENSURE_CAPABILITY(env, can_redefine_classes);
ENSURE_NON_NEGATIVE(class_count);
ENSURE_NON_NULL(class_definitions);
rc = redefineClassesCommon(env, class_count, class_definitions, currentThread, J9_FINDCLASS_FLAG_REDEFINING);
done:
vm->internalVMFunctions->internalExitVMToJNI(currentThread);
}
omrthread_monitor_exit(jvmtiData->redefineMutex);
TRACE_JVMTI_RETURN(jvmtiRedefineClasses);
}