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createramclass.cpp
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/*******************************************************************************
* Copyright IBM Corp. and others 1991
*
* 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] https://openjdk.org/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
*******************************************************************************/
#include <stdlib.h>
#include "j9.h"
#include "j9protos.h"
#include "j9consts.h"
#include "omrgcconsts.h"
#include "rommeth.h"
/* include stackwalk.h to get value of J9SW_NEEDS_JIT_2_INTERP_THUNKS */
#include "stackwalk.h"
#include "objhelp.h"
#include "../util/ut_module.h"
#undef UT_MODULE_LOADED
#undef UT_MODULE_UNLOADED
#include "ut_j9vm.h"
#include "j9bcvnls.h"
#include "j9vmnls.h"
#include "j2sever.h"
#include "vm_internal.h"
#include "VMHelpers.hpp"
#undef J9VM_TRACE_VTABLE_ACCESS
extern "C" {
#define VTABLE_SLOT_TAG_MASK 3
#define ROM_METHOD_ID_TAG 1
#define DEFAULT_CONFLICT_METHOD_ID_TAG 2
#define EQUIVALENT_SET_ID_TAG 3
#define INTERFACE_TAG 1
#define LOCAL_INTERFACE_ARRAY_SIZE 10
#define DEFAULT_NUMBER_OF_ENTRIES_IN_FLATTENED_CLASS_CACHE 8
enum J9ClassFragments {
RAM_CLASS_HEADER_FRAGMENT,
RAM_METHODS_FRAGMENT,
RAM_SUPERCLASSES_FRAGMENT,
RAM_INSTANCE_DESCRIPTION_FRAGMENT,
RAM_ITABLE_FRAGMENT,
RAM_STATICS_FRAGMENT,
RAM_CONSTANT_POOL_FRAGMENT,
RAM_CALL_SITES_FRAGMENT,
#if defined(J9VM_OPT_OPENJDK_METHODHANDLE)
RAM_INVOKE_CACHE_FRAGMENT,
#else /* defined(J9VM_OPT_OPENJDK_METHODHANDLE) */
RAM_METHOD_TYPES_FRAGMENT,
RAM_VARHANDLE_METHOD_TYPES_FRAGMENT,
#endif /* defined(J9VM_OPT_OPENJDK_METHODHANDLE) */
RAM_STATIC_SPLIT_TABLE_FRAGMENT,
RAM_SPECIAL_SPLIT_TABLE_FRAGMENT,
#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
RAM_CLASS_FLATTENED_CLASS_CACHE,
#endif /* J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES */
RAM_CLASS_FRAGMENT_COUNT
};
/*
* RAM_CLASS_FRAGMENT_LIMIT is the inclusive lower bound of "large" RAM class free blocks. Its value
* is the largest alignment constraint amongst RAM class fragments: J9_REQUIRED_CLASS_ALIGNMENT.
* RAM_CLASS_SMALL_FRAGMENT_LIMIT is the inclusive lower bound of "small" RAM class free blocks.
* Smaller blocks are placed on the "tiny" free block list. Its value is chosen experimentally to
* provide optimal performance on the shared classes class loading benchmark.
*/
#define RAM_CLASS_FRAGMENT_LIMIT J9_REQUIRED_CLASS_ALIGNMENT
#define RAM_CLASS_SMALL_FRAGMENT_LIMIT ((sizeof(UDATA) + 4) * sizeof(UDATA))
/* align method table start such that CP is correctly aligned */
#if defined(J9VM_INTERP_NATIVE_SUPPORT)
/* 3 bits of tag needed in J9Method->constantPool */
#if defined(J9VM_JIT_DYNAMIC_LOOP_TRANSFER)
/* 4 bits of tag needed in J9Method->constantPool */
#define REQUIRED_CONSTANT_POOL_ALIGNMENT 16
#endif
#endif
#if !defined(REQUIRED_CONSTANT_POOL_ALIGNMENT)
#define REQUIRED_CONSTANT_POOL_ALIGNMENT 8
#endif
/* Static J9ITable used as a non-NULL iTable cache value by classes that don't implement any interfaces. Defined in hshelp.c. */
extern const J9ITable invalidITable;
typedef struct J9RAMClassFreeListLargeBlock {
UDATA size;
struct J9RAMClassFreeListLargeBlock* nextFreeListBlock;
UDATA maxSizeInList;
} J9RAMClassFreeListLargeBlock;
typedef struct RAMClassAllocationRequest {
UDATA prefixSize;
UDATA alignment;
UDATA alignedSize;
UDATA *address;
UDATA index;
UDATA fragmentSize;
struct RAMClassAllocationRequest *next;
} RAMClassAllocationRequest;
typedef struct J9CreateRAMClassState {
J9Class *ramClass;
j9object_t classObject;
BOOLEAN retry;
J9Class *classBeingRedefined;
IDATA entryIndex;
I_32 locationType;
#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
UDATA valueTypeFlags;
#endif /* J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES */
} J9CreateRAMClassState;
typedef struct J9EquivalentEntry {
J9Method *method;
struct J9EquivalentEntry *next;
} J9EquivalentEntry;
typedef struct J9OverrideErrorData {
J9ClassLoader *loader1;
J9UTF8 *class1NameUTF;
J9ClassLoader *loader2;
J9UTF8 *class2NameUTF;
J9UTF8 *exceptionClassNameUTF;
J9UTF8 *methodNameUTF;
J9UTF8 *methodSigUTF;
} J9OverrideErrorData;
static J9Class* markInterfaces(J9ROMClass *romClass, J9Class *superclass, J9ClassLoader *classLoader, BOOLEAN *foundCloneable, UDATA *markedInterfaceCount, UDATA *inheritedInterfaceCount, IDATA *maxInterfaceDepth);
static void unmarkInterfaces(J9Class *interfaceHead);
static void createITable(J9VMThread* vmStruct, J9Class *ramClass, J9Class *interfaceClass, J9ITable ***previousLink, UDATA **currentSlot, UDATA depth);
static UDATA* initializeRAMClassITable(J9VMThread* vmStruct, J9Class *ramClass, J9Class *superclass, UDATA* currentSlot, J9Class *interfaceHead, IDATA maxInterfaceDepth);
static UDATA addInterfaceMethods(J9VMThread *vmStruct, J9ClassLoader *classLoader, J9Class *interfaceClass, UDATA vTableMethodCount, UDATA *vTableAddress, J9Class *superclass, J9ROMClass *romClass, UDATA *defaultConflictCount, J9Pool *equivalentSets, UDATA *equivSetCount, J9OverrideErrorData *errorData);
static UDATA* computeVTable(J9VMThread *vmStruct, J9ClassLoader *classLoader, J9Class *superclass, J9ROMClass *taggedClass, UDATA packageID, J9ROMMethod ** methodRemapArray, J9Class *interfaceHead, UDATA *defaultConflictCount, UDATA interfaceCount, UDATA inheritedInterfaceCount, J9OverrideErrorData *errorData);
static void copyVTable(J9VMThread *vmStruct, J9Class *ramClass, J9Class *superclass, UDATA *vTable, UDATA defaultConflictCount);
static UDATA processVTableMethod(J9VMThread *vmThread, J9ClassLoader *classLoader, UDATA *vTableAddress, J9Class *superclass, J9ROMClass *romClass, J9ROMMethod *romMethod, UDATA localPackageID, UDATA vTableMethodCount, void *storeValue, J9OverrideErrorData *errorData);
static VMINLINE UDATA growNewVTableSlot(UDATA *vTableAddress, UDATA vTableMethodCount, void *storeValue);
static UDATA getVTableIndexForNameAndSigStartingAt(UDATA *vTable, J9UTF8 *name, J9UTF8 *signature, UDATA vTableIndex);
#if JAVA_SPEC_VERSION < 24
static UDATA checkPackageAccess(J9VMThread *vmThread, J9Class *foundClass, UDATA classPreloadFlags);
#endif /* JAVA_SPEC_VERSION < 24 */
static void setCurrentExceptionForBadClass(J9VMThread *vmThread, J9UTF8 *badClassName, UDATA exceptionIndex, U_32 nlsModuleName, U_32 nlsMessageID);
static BOOLEAN verifyClassLoadingStack(J9VMThread *vmThread, J9ClassLoader *classLoader, J9ROMClass *romClass);
static void popFromClassLoadingStack(J9VMThread *vmThread);
static VMINLINE BOOLEAN loadSuperClassAndInterfaces(J9VMThread *vmThread, J9ClassLoader *classLoader, J9ROMClass *romClass, UDATA options, J9Class *elementClass, BOOLEAN hotswapping, UDATA classPreloadFlags, J9Class **superclassOut, J9Module *module);
static VMINLINE BOOLEAN checkSuperClassAndInterfaces(J9VMThread *vmThread, J9ClassLoader *classLoader, J9ROMClass *romClass, UDATA options, UDATA packageID, BOOLEAN hotswapping, J9Class *superclass, J9Module *module, J9ROMClass **badClassOut, bool *incompatibleOut);
static J9Class* internalCreateRAMClassDropAndReturn(J9VMThread *vmThread, J9ROMClass *romClass, J9CreateRAMClassState *state);
static J9Class* internalCreateRAMClassDoneNoMutex(J9VMThread *vmThread, J9ROMClass *romClass, UDATA options, J9CreateRAMClassState *state);
static J9Class* internalCreateRAMClassDone(J9VMThread *vmThread, J9ClassLoader *classLoader, J9ClassLoader *hostClassLoader, J9ROMClass *romClass, UDATA options, J9Class *elementClass,
J9UTF8 *className, J9CreateRAMClassState *state, J9Class *superclass, J9MemorySegment *segment);
#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
static BOOLEAN loadFlattenableFieldValueClasses(J9VMThread *vmThread, J9ClassLoader *classLoader, J9ROMClass *romClass, UDATA classPreloadFlags, J9Module *module, UDATA *valueTypeFlags, J9FlattenedClassCache *flattenedClassCache, J9Class *superClazz);
static BOOLEAN checkFlattenableFieldValueClasses(J9VMThread *currentThread, J9ClassLoader *classLoader, J9ROMClass *romClass, UDATA packageID, J9Module *module, J9ROMClass **badClassOut);
static J9Class* internalCreateRAMClassFromROMClassImpl(J9VMThread *vmThread, J9ClassLoader *classLoader, J9ROMClass *romClass, UDATA options, J9Class *elementClass,
J9ROMMethod **methodRemapArray, IDATA entryIndex, I_32 locationType, J9Class *classBeingRedefined, J9Class *superclass, J9CreateRAMClassState *state,
J9ClassLoader* hostClassLoader, J9Class *hostClass, J9Module *module, J9FlattenedClassCache *flattenedClassCache, UDATA *valueTypeFlags);
#else /* J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES */
static J9Class* internalCreateRAMClassFromROMClassImpl(J9VMThread *vmThread, J9ClassLoader *classLoader, J9ROMClass *romClass, UDATA options, J9Class *elementClass,
J9ROMMethod **methodRemapArray, IDATA entryIndex, I_32 locationType, J9Class *classBeingRedefined, J9Class *superclass, J9CreateRAMClassState *state,
J9ClassLoader* hostClassLoader, J9Class *hostClass, J9Module *module);
#endif /* J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES */
static J9MemorySegment* internalAllocateRAMClass(J9JavaVM *javaVM, J9ClassLoader *classLoader, RAMClassAllocationRequest *allocationRequests, UDATA allocationRequestCount);
static I_32 interfaceDepthCompare(const void *a, const void *b);
#if defined(J9VM_INTERP_CUSTOM_SPIN_OPTIONS)
static void checkForCustomSpinOptions(void *element, void *userData);
#endif /* J9VM_INTERP_CUSTOM_SPIN_OPTIONS */
#if JAVA_SPEC_VERSION >= 11
static void trcModulesSettingPackage(J9VMThread *vmThread, J9Class *ramClass, J9ClassLoader *classLoader, J9UTF8 *className);
#endif /* JAVA_SPEC_VERSION >= 11 */
static void initializeClassLinks(J9Class *ramClass, J9Class *superclass, J9MemorySegment *segment, UDATA options);
/*
* A class which extends (perhaps indirectly) the 'magic'
* accessor class is exempt from the normal access rules.
*/
#if JAVA_SPEC_VERSION == 8
#define MAGIC_ACCESSOR_IMPL "sun/reflect/MagicAccessorImpl"
#else /* JAVA_SPEC_VERSION == 8 */
#define MAGIC_ACCESSOR_IMPL "jdk/internal/reflect/MagicAccessorImpl"
#endif /* JAVA_SPEC_VERSION == 8 */
static VMINLINE J9Class *
getArrayClass(J9Class *elementClass, UDATA options)
{
#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
if (J9_ARE_ALL_BITS_SET(options, J9_FINDCLASS_FLAG_CLASS_OPTION_NULL_RESTRICTED_ARRAY)) {
return elementClass->nullRestrictedArrayClass;
} else
#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
{
return elementClass->arrayClass;
}
}
/**
* Mark all of the interfaces supported by this class, including all interfaces
* inherited by superinterfaces. Unmark all interfaces which are inherited from
* the superclass.
*
* Returns the head of a linked list of interfaces (through the tagged instanceDescription field).
*/
static J9Class *
markInterfaces(J9ROMClass *romClass, J9Class *superclass, J9ClassLoader *classLoader, BOOLEAN *foundCloneable, UDATA *markedInterfaceCount, UDATA *inheritedInterfaceCount, IDATA *maxInterfaceDepth)
{
J9Class *interfaceHead = NULL;
J9Class *lastInterface = NULL;
UDATA interfaceCount = romClass->interfaceCount;
UDATA foundInterfaces = 0;
UDATA localInheritedInterfaceCount = 0;
IDATA localMaxInterfaceDepth = *maxInterfaceDepth;
/* Mark all interfaces which are inherited from the superclass. */
if (superclass != NULL) {
J9ITable *iTable = (J9ITable *)superclass->iTable;
while (iTable != NULL) {
/* No need to check if the new class is an interface, since all
* interfaces have Object as their superclass, which will not
* incorrectly implement any interfaces.
*/
localMaxInterfaceDepth = OMR_MAX(localMaxInterfaceDepth, (IDATA)iTable->depth);
localInheritedInterfaceCount += 1;
iTable->interfaceClass->instanceDescription = (UDATA *)-1;
iTable = iTable->next;
}
}
/* Mark all of the interfaces supported by this class, including all interfaces inherited by superinterfaces. */
if (interfaceCount != 0) {
UDATA i;
J9SRP *interfaceNames = J9ROMCLASS_INTERFACES(romClass);
for (i = 0; i<interfaceCount; i++) {
J9ITable *iTable;
J9UTF8 *interfaceName = NNSRP_GET(interfaceNames[i], J9UTF8*);
/* peek the table, do not load */
J9Class *interfaceClass = hashClassTableAt(classLoader, J9UTF8_DATA(interfaceName), J9UTF8_LENGTH(interfaceName));
/* the interface classes are not NULL, as this was checked by the caller */
if ((foundCloneable != NULL) && (J9AccClassCloneable == (J9CLASS_FLAGS(interfaceClass) & J9AccClassCloneable))) {
*foundCloneable = TRUE;
}
iTable = (J9ITable *)interfaceClass->iTable;
while (iTable != NULL) {
/* the marked field is shared with the instanceDescription
* field. Always keep the low bit tagged so that, if anyone
* does look at it, they don't try to indirect it. Interfaces
* which are inherited are marked, so skip them.
*/
if (iTable->interfaceClass->instanceDescription == (UDATA *)1) {
foundInterfaces++;
/* Mark the current interface so it cannot be linked to itself. */
iTable->interfaceClass->instanceDescription = (UDATA *)-1;
if (lastInterface == NULL) {
interfaceHead = lastInterface = iTable->interfaceClass;
} else {
lastInterface->instanceDescription = (UDATA *)((UDATA)iTable->interfaceClass | INTERFACE_TAG);
lastInterface = iTable->interfaceClass;
}
}
localMaxInterfaceDepth = OMR_MAX(localMaxInterfaceDepth, (IDATA)iTable->depth);
iTable = iTable->next;
}
}
}
if (lastInterface != NULL) {
/* Unmark the last interface. */
lastInterface->instanceDescription = (UDATA *)1;
}
/* Unmark all interfaces which are inherited from the superclass. */
if (superclass != NULL) {
J9ITable *iTable = (J9ITable *)superclass->iTable;
while (iTable != NULL) {
/* No need to check if the new class is an interface, since all
* interfaces have Object as their superclass, which will not
* incorrectly implement any interfaces.
*/
iTable->interfaceClass->instanceDescription = (UDATA *)1;
iTable = iTable->next;
}
}
*markedInterfaceCount = foundInterfaces;
*inheritedInterfaceCount = localInheritedInterfaceCount;
*maxInterfaceDepth = localMaxInterfaceDepth;
return interfaceHead;
}
static void
unmarkInterfaces(J9Class *interfaceHead)
{
while (interfaceHead != NULL) {
J9Class *nextInterface = (J9Class *)((UDATA)interfaceHead->instanceDescription & ~INTERFACE_TAG);
interfaceHead->instanceDescription = (UDATA *)1;
interfaceHead = nextInterface;
}
}
static void
addITableMethods(J9VMThread* vmStruct, J9Class *ramClass, J9Class *interfaceClass, UDATA **currentSlot)
{
J9ROMClass *interfaceRomClass = interfaceClass->romClass;
UDATA count = interfaceRomClass->romMethodCount;
if (count != 0) {
J9VTableHeader *vTableHeader = J9VTABLE_HEADER_FROM_RAM_CLASS(ramClass);
UDATA vTableSize = vTableHeader->size;
J9Method **vTable = J9VTABLE_FROM_HEADER(vTableHeader);
J9Method *interfaceRamMethod = interfaceClass->ramMethods;
U_32 *ordering = J9INTERFACECLASS_METHODORDERING(interfaceClass);
UDATA index = 0;
while (count-- > 0) {
if (NULL != ordering) {
interfaceRamMethod = interfaceClass->ramMethods + ordering[index++];
}
J9ROMMethod *interfaceRomMethod = J9_ROM_METHOD_FROM_RAM_METHOD(interfaceRamMethod);
if (J9ROMMETHOD_IN_ITABLE(interfaceRomMethod)) {
J9UTF8 *interfaceMethodName = J9ROMMETHOD_NAME(interfaceRomMethod);
J9UTF8 *interfaceMethodSig = J9ROMMETHOD_SIGNATURE(interfaceRomMethod);
UDATA vTableOffset = 0;
UDATA searchIndex = 0;
/* Search the vTable for a public method of the correct name. */
while (searchIndex < vTableSize) {
J9Method *vTableRamMethod = vTable[searchIndex];
J9ROMMethod *vTableRomMethod = J9_ROM_METHOD_FROM_RAM_METHOD(vTableRamMethod);
if (J9ROMMETHOD_IN_ITABLE(vTableRomMethod)) {
J9UTF8 *vTableMethodName = J9ROMMETHOD_NAME(vTableRomMethod);
J9UTF8 *vTableMethodSig = J9ROMMETHOD_SIGNATURE(vTableRomMethod);
if ((J9UTF8_LENGTH(interfaceMethodName) == J9UTF8_LENGTH(vTableMethodName))
&& (J9UTF8_LENGTH(interfaceMethodSig) == J9UTF8_LENGTH(vTableMethodSig))
&& (memcmp(J9UTF8_DATA(interfaceMethodName), J9UTF8_DATA(vTableMethodName), J9UTF8_LENGTH(vTableMethodName)) == 0)
&& (memcmp(J9UTF8_DATA(interfaceMethodSig), J9UTF8_DATA(vTableMethodSig), J9UTF8_LENGTH(vTableMethodSig)) == 0)
) {
/* fill in interface index --> vTableOffset mapping */
vTableOffset = J9VTABLE_OFFSET_FROM_INDEX(searchIndex);
**currentSlot = vTableOffset;
(*currentSlot)++;
break;
}
}
searchIndex++;
}
#if defined(J9VM_TRACE_ITABLE)
{
PORT_ACCESS_FROM_VMC(vmStruct);
j9tty_printf(PORTLIB, "\n map %.*s%.*s to vTableOffset=%d (%d)", J9UTF8_LENGTH(interfaceMethodName),
J9UTF8_DATA(interfaceMethodName), J9UTF8_LENGTH(interfaceMethodSig), J9UTF8_DATA(interfaceMethodSig), vTableOffset, searchIndex);
}
#endif
}
interfaceRamMethod++;
}
}
}
static void
createITable(J9VMThread* vmStruct, J9Class *ramClass, J9Class *interfaceClass, J9ITable ***previousLink, UDATA **currentSlot, UDATA depth)
{
/* Fill in the iTable header and link it into the list. */
J9ITable *iTable = (J9ITable *)(*currentSlot);
**previousLink = iTable;
*previousLink = &iTable->next;
iTable->interfaceClass = interfaceClass;
iTable->depth = depth;
*currentSlot = (UDATA *)((UDATA)(*currentSlot) + sizeof(J9ITable));
/* If the newly-built class is not an interface class, fill in the iTable. */
if (J9AccInterface != (ramClass->romClass->modifiers & J9AccInterface)) {
/* iTables contain all methods from the local interface, and any interfaces it extends */
J9ITable *allInterfaces = (J9ITable*)interfaceClass->iTable;
do {
addITableMethods(vmStruct, ramClass, allInterfaces->interfaceClass, currentSlot);
allInterfaces = allInterfaces->next;
} while (NULL != allInterfaces);
}
}
static UDATA *
initializeRAMClassITable (J9VMThread* vmStruct, J9Class *ramClass, J9Class *superclass, UDATA* currentSlot, J9Class *interfaceHead, IDATA maxInterfaceDepth)
{
J9Class *booleanArrayClass;
J9ROMClass *romClass = ramClass->romClass;
#if defined(J9VM_TRACE_ITABLE)
{
PORT_ACCESS_FROM_VMC(vmStruct);
J9UTF8 *className = J9ROMCLASS_CLASSNAME(romClass);
j9tty_printf(PORTLIB, "\n<initializeRAMClassITable: %.*s %d>", J9UTF8_LENGTH(className), J9UTF8_DATA(className), (romClass->modifiers & J9AccInterface));
}
#endif
/* All array classes share the same iTable. If this is an array class and [Z (the first allocated
* array class) has been filled in, copy the iTable from [Z.
*/
booleanArrayClass = vmStruct->javaVM->booleanArrayClass;
if (J9ROMCLASS_IS_ARRAY(romClass) && (booleanArrayClass != NULL)) {
ramClass->iTable = booleanArrayClass->iTable;
if ((J9CLASS_FLAGS(booleanArrayClass) & J9AccClassCloneable) == J9AccClassCloneable) {
ramClass->classDepthAndFlags |= J9AccClassCloneable;
}
unmarkInterfaces(interfaceHead);
} else {
J9ITable *superclassInterfaces = NULL;
J9ITable **previousLink;
if (superclass != NULL) {
superclassInterfaces = (J9ITable *)superclass->iTable;
}
/* Create the iTables. Interface classes must add themselves to their iTables. */
previousLink = (J9ITable **)&ramClass->iTable;
if ((romClass->modifiers & J9AccInterface) == J9AccInterface) {
createITable(vmStruct, ramClass, ramClass, &previousLink, ¤tSlot, (UDATA)(maxInterfaceDepth + 1));
}
while (interfaceHead != NULL) {
J9Class *nextInterface;
createITable(vmStruct, ramClass, interfaceHead, &previousLink, ¤tSlot, ((J9ITable*)interfaceHead->iTable)->depth);
nextInterface = (J9Class *)((UDATA)interfaceHead->instanceDescription & ~INTERFACE_TAG);
/* This is the last walk, so unmark the interfaces */
interfaceHead->instanceDescription = (UDATA *)1;
interfaceHead = nextInterface;
}
*previousLink = superclassInterfaces;
}
return currentSlot;
}
/* Helper function to compare two name and sigs.
* It compares the lengths of both name and sig first before doing any memcmp.
*
* @param[in] name1 The first name
* @param[in] sig1 The first signature
* @param[in] name2 The second name
* @param[in] sig2 The second signature
* @return true iff the names and signatures are the same.
*/
static bool VMINLINE
areNamesAndSignaturesEqual(J9UTF8 *name1, J9UTF8 *sig1, J9UTF8 *name2, J9UTF8 *sig2)
{
/* utf8 pointers may be equal due to utf sharing */
return ((name1 == name2) && (sig1 == sig2))
|| /* Do length checks first as they are less expensive than memcmp */
(((J9UTF8_LENGTH(name1) == J9UTF8_LENGTH(name2))
&& (J9UTF8_LENGTH(sig1) == J9UTF8_LENGTH(sig2))
&& (0 == memcmp(J9UTF8_DATA(name1), J9UTF8_DATA(name2), J9UTF8_LENGTH(name2)))
&& (0 == memcmp(J9UTF8_DATA(sig1), J9UTF8_DATA(sig2), J9UTF8_LENGTH(sig2)))));
}
typedef enum {
SLOT_IS_ROM_METHOD,
SLOT_IS_RAM_METHOD,
SLOT_IS_INTERFACE_RAM_METHOD,
SLOT_IS_CONFLICT_METHOD,
SLOT_IS_CONFLICT_TAG,
SLOT_IS_EQUIVSET_TAG,
SLOT_IS_INVALID = 0x80000000 /* force wide enums */
}INTERFACE_STATE;
static UDATA
addInterfaceMethods(J9VMThread *vmStruct, J9ClassLoader *classLoader, J9Class *interfaceClass, UDATA vTableMethodCount, UDATA *vTableAddress, J9Class *superclass, J9ROMClass *romClass, UDATA *defaultConflictCount, J9Pool *equivalentSets, UDATA *equivSetCount, J9OverrideErrorData *errorData)
{
J9Method **vTableMethods = J9VTABLE_FROM_HEADER(vTableAddress);
J9ROMClass *interfaceROMClass = interfaceClass->romClass;
UDATA count = interfaceROMClass->romMethodCount;
bool verifierEnabled = J9_ARE_ANY_BITS_SET(vmStruct->javaVM->runtimeFlags, J9_RUNTIME_VERIFY);
if (0 != count) {
const void * conflictRunAddress = J9_BCLOOP_ENCODE_SEND_TARGET(J9_BCLOOP_SEND_TARGET_DEFAULT_CONFLICT);
J9Method *interfaceMethod = interfaceClass->ramMethods;
UDATA interfaceDepth = ((J9ITable *)interfaceClass->iTable)->depth;
UDATA j = 0;
for (j=0; j < count; j++) {
J9ROMMethod *romMethod = J9_ROM_METHOD_FROM_RAM_METHOD(interfaceMethod);
/* Ignore the <clinit> from the interface class. */
if (J9ROMMETHOD_IN_ITABLE(romMethod)) {
J9UTF8 *interfaceMethodNameUTF = J9ROMMETHOD_NAME(romMethod);
J9UTF8 *interfaceMethodSigUTF = J9ROMMETHOD_SIGNATURE(romMethod);
UDATA tempIndex = vTableMethodCount;
INTERFACE_STATE state = SLOT_IS_INVALID;
/* If the vTable already has a public declaration of the method that isn't
* either an abstract interface method or default method conflict, do not
* process the interface method at all. */
while (tempIndex > 0) {
/* Decrement the index, convert from one based to zero based index */
tempIndex -= 1;
J9ROMClass *methodROMClass = NULL;
J9Class *methodClass = NULL;
J9ROMMethod *vTableMethod = (J9ROMMethod *)vTableMethods[tempIndex];
if (ROM_METHOD_ID_TAG == ((UDATA)vTableMethod & VTABLE_SLOT_TAG_MASK)) {
methodClass = NULL;
methodROMClass = romClass;
vTableMethod = (J9ROMMethod *)((UDATA)vTableMethod & ~ROM_METHOD_ID_TAG);
state = SLOT_IS_ROM_METHOD;
} else if (DEFAULT_CONFLICT_METHOD_ID_TAG == ((UDATA)vTableMethod & VTABLE_SLOT_TAG_MASK)) {
J9Method *conflictMethod = (J9Method *)((UDATA)vTableMethod & ~DEFAULT_CONFLICT_METHOD_ID_TAG);
methodClass = J9_CLASS_FROM_METHOD(conflictMethod);
methodROMClass = methodClass->romClass;
vTableMethod = J9_ROM_METHOD_FROM_RAM_METHOD(conflictMethod);
state = SLOT_IS_CONFLICT_TAG;
} else if (EQUIVALENT_SET_ID_TAG == ((UDATA)vTableMethod & VTABLE_SLOT_TAG_MASK)) {
state = SLOT_IS_EQUIVSET_TAG;
J9EquivalentEntry *entry = (J9EquivalentEntry*)((UDATA)vTableMethod & ~EQUIVALENT_SET_ID_TAG);
methodClass = J9_CLASS_FROM_METHOD((J9Method *)entry->method);
methodROMClass = methodClass->romClass;
vTableMethod = J9_ROM_METHOD_FROM_RAM_METHOD(entry->method);
} else {
methodClass = J9_CLASS_FROM_METHOD((J9Method *)vTableMethod);
methodROMClass = methodClass->romClass;
vTableMethod = J9_ROM_METHOD_FROM_RAM_METHOD(vTableMethod);
state = SLOT_IS_RAM_METHOD;
if (conflictRunAddress == ((J9Method *)vTableMethod)->methodRunAddress) {
state = SLOT_IS_CONFLICT_METHOD;
} else if (J9ROMCLASS_IS_INTERFACE(methodROMClass)) {
state = SLOT_IS_INTERFACE_RAM_METHOD;
}
}
J9UTF8 *vTableMethodNameUTF = J9ROMMETHOD_NAME(vTableMethod);
J9UTF8 *vTableMethodSigUTF = J9ROMMETHOD_SIGNATURE(vTableMethod);
if (areNamesAndSignaturesEqual(interfaceMethodNameUTF, interfaceMethodSigUTF, vTableMethodNameUTF, vTableMethodSigUTF)) {
switch(state) {
case SLOT_IS_RAM_METHOD:
/* Existing, non-interface method found - only need to do the public check */
break;
case SLOT_IS_ROM_METHOD:
/* Found method defined in this class - only need to do the public check */
break;
case SLOT_IS_CONFLICT_METHOD:
/* conflict detected when building the superclass vtable. Replace with current interface method
* and allow the conflict to be re-detected if it hasn't been resolved by subsequent interfaces
*/
vTableMethods[tempIndex] = interfaceMethod;
goto continueInterfaceScan;
case SLOT_IS_INTERFACE_RAM_METHOD:
/* Here we need to determine if this is a potential conflict or equivalent set */
if (((J9ITable *)methodClass->iTable)->depth < interfaceDepth) {
/* If the interface method is less deep then the candidate method, the interface method
* was filled in by the super class's vtable build. Replace with the current method
* and continue.
*/
vTableMethods[tempIndex] = interfaceMethod;
goto continueInterfaceScan;
} else {
/* Locally added interface method - look for either a merge, conflict or equivSet */
if (isSameOrSuperInterfaceOf(interfaceClass, methodClass)) {
/* Valid defender merge - do nothing as the current vtable method is
* the most *specific* one.
*/
} else {
/* if either is abstract, convert to equivSet, else conflict */
const UDATA combinedModifiers = J9_ROM_METHOD_FROM_RAM_METHOD(interfaceMethod)->modifiers | vTableMethod->modifiers;
if (J9_ARE_ANY_BITS_SET(combinedModifiers, J9AccAbstract)) {
/* Convert to equivSet by adding the existing vtable method to the equivSet */
J9EquivalentEntry *entry = (J9EquivalentEntry*) pool_newElement(equivalentSets);
if (NULL == entry) {
/* OOM will be thrown */
goto fail;
}
entry->method = vTableMethods[tempIndex];
entry->next = NULL;
vTableMethods[tempIndex] = (J9Method *)((UDATA)entry | EQUIVALENT_SET_ID_TAG);
/* This will either be the single default method or the first abstract method */
/* ... and then adding the new method */
*equivSetCount += 1;
goto add_existing;
} else {
/* Conflict detected */
vTableMethods[tempIndex] = (J9Method *)((UDATA)vTableMethods[tempIndex] | DEFAULT_CONFLICT_METHOD_ID_TAG);
*defaultConflictCount += 1;
}
}
}
break;
case SLOT_IS_EQUIVSET_TAG: {
add_existing:
J9EquivalentEntry * existing_entry = (J9EquivalentEntry*)((UDATA)vTableMethods[tempIndex] & ~EQUIVALENT_SET_ID_TAG);
J9EquivalentEntry * previous_entry = existing_entry;
while (NULL != existing_entry) {
if (isSameOrSuperInterfaceOf(interfaceClass, J9_CLASS_FROM_METHOD(existing_entry->method))) {
/* Do nothing - this is already shadowed by an existing method */
goto continueInterfaceScan;
}
previous_entry = existing_entry;
existing_entry = existing_entry->next;
}
existing_entry = previous_entry;
J9EquivalentEntry * new_entry = (J9EquivalentEntry*) pool_newElement(equivalentSets);
if (NULL == new_entry) {
/* OOM will be thrown */
goto fail;
}
new_entry->method = interfaceMethod;
new_entry->next = existing_entry->next;
existing_entry->next = new_entry;
goto continueInterfaceScan;
}
case SLOT_IS_CONFLICT_TAG:
/* Already marked as a conflict found in *this* class */
goto continueInterfaceScan;
case SLOT_IS_INVALID:
default:
Assert_VM_unreachable();
break;
}
if (J9AccPublic == (vTableMethod->modifiers & J9AccPublic)) {
if (verifierEnabled) {
J9ClassLoader *interfaceLoader = interfaceClass->classLoader;
J9ClassLoader *vTableMethodLoader = classLoader;
if (NULL != methodClass) {
vTableMethodLoader = methodClass->classLoader;
}
if (interfaceLoader != vTableMethodLoader) {
if (0 != j9bcv_checkClassLoadingConstraintsForSignature(vmStruct, vTableMethodLoader, interfaceLoader, vTableMethodSigUTF, interfaceMethodSigUTF, FALSE)) {
J9UTF8 *vTableMethodClassNameUTF = J9ROMCLASS_CLASSNAME(romClass);
if (NULL != methodClass) {
vTableMethodClassNameUTF = J9ROMCLASS_CLASSNAME(methodClass->romClass);
}
J9UTF8 *interfaceClassNameUTF = J9ROMCLASS_CLASSNAME(interfaceClass->romClass);
/* LinkageError will be thrown */
errorData->loader1 = vTableMethodLoader;
errorData->class1NameUTF = vTableMethodClassNameUTF;
errorData->loader2 = interfaceLoader;
errorData->class2NameUTF = interfaceClassNameUTF;
errorData->exceptionClassNameUTF = interfaceClassNameUTF;
errorData->methodNameUTF = vTableMethodNameUTF;
errorData->methodSigUTF = vTableMethodSigUTF;
goto fail;
}
}
}
goto continueInterfaceScan;
}
}
}
/* Add the interface method as the Local class does not implement a public method of the given name. */
vTableMethodCount = growNewVTableSlot((UDATA *)vTableMethods, vTableMethodCount, interfaceMethod);
#if defined(J9VM_TRACE_VTABLE_ACCESS)
{
PORT_ACCESS_FROM_VMC(vmStruct);
J9UTF8 *classNameUTF = J9ROMCLASS_CLASSNAME(romClass);
j9tty_printf(PORTLIB, "\n<vtbl_init: adding @ index=%d %.*s.%.*s%.*s (0x%x)>",
vTableMethodCount,
J9UTF8_LENGTH(classNameUTF), J9UTF8_DATA(classNameUTF),
J9UTF8_LENGTH(interfaceMethodNameUTF), J9UTF8_DATA(interfaceMethodNameUTF),
J9UTF8_LENGTH(interfaceMethodSigUTF), J9UTF8_DATA(interfaceMethodSigUTF),
romMethod);
}
#endif
}
continueInterfaceScan:
interfaceMethod++;
}
}
done:
return vTableMethodCount;
fail:
vTableMethodCount = (UDATA)-1;
goto done;
}
/*
* Compare two classes based on the itable->depth field.
* Results in shallowest -> deepest ordering.
* Return
* 0 if the depths are the same
* - if a->depth < b->depth
* + if a->depth > b->depth
*/
static I_32
interfaceDepthCompare(const void *a, const void *b)
{
J9ITable *iA = (J9ITable *)(*(J9Class **)a)->iTable;
J9ITable *iB = (J9ITable *)(*(J9Class **)b)->iTable;
return (I_32)(iA->depth - iB->depth);
}
/*
* Process the "equivalent sets" stored in the vtable slots. The sets
* will contain either:
* A) All abstract interface methods
* B) A single default method and 1+ abstract interface methods
* C) Multiple default methods and 1+ abstract interface methods
* The equivalent set will be replaced by:
* A) One of the abstract interface methods so that AME will be thrown when invoked
* B) The single default method
* C) Converted to a 'default conflict method'
* @param[in] vmStruct The J9VMThread
* @param[in,out] defaultConflictCount The count of conflict methods. Possibly updated
* @param[in] vTableMethodCount The number of methods in vtable
* @param[in] vTableAddress The vtable itself
*/
static void
processEquivalentSets(J9VMThread *vmStruct, UDATA *defaultConflictCount, UDATA vTableMethodCount, UDATA *vTableAddress)
{
UDATA *vTableMethods = (UDATA *)J9VTABLE_FROM_HEADER(vTableAddress);
for (UDATA i = 0; i < vTableMethodCount; i++) {
UDATA slotValue = vTableMethods[i];
if (EQUIVALENT_SET_ID_TAG == (slotValue & VTABLE_SLOT_TAG_MASK)) {
/* Process set and determine if there is a method that satisfies or if this is a conflict */
J9EquivalentEntry *entry = (J9EquivalentEntry*)(slotValue & ~EQUIVALENT_SET_ID_TAG);
J9Method *candidate = entry->method;
bool foundNonAbstract = false;
while (NULL != entry) {
if (J9_ARE_NO_BITS_SET(J9_ROM_METHOD_FROM_RAM_METHOD(entry->method)->modifiers, J9AccAbstract)) {
if (foundNonAbstract) {
/* Two non-abstract methods -> conflict */
vTableMethods[i] = ((UDATA)entry->method | DEFAULT_CONFLICT_METHOD_ID_TAG);
*defaultConflictCount += 1;
goto continueProcessingVTable;
}
foundNonAbstract = true;
candidate = entry->method;
}
entry = entry->next;
}
/* This will either be the single default method or the first abstract method */
vTableMethods[i] = (UDATA)candidate;
}
continueProcessingVTable: ;
}
}
/**
* Computes the virtual function dispatch table from the specified
* superclass and ROM information. Only virtual methods (not constructors) appear
* in the vtable -- the vtable inherits the number of slots from the superclass and
* adds a single slot for every method defined at this level.
*
* Return the malloc'ed vTable, or the ramClass vTable in the case of hotswap vTable rebuild.
*
* The caller must hold the class table mutex or exclusive access.
*/
static UDATA *
computeVTable(J9VMThread *vmStruct, J9ClassLoader *classLoader, J9Class *superclass, J9ROMClass *taggedClass, UDATA packageID, J9ROMMethod ** methodRemapArray, J9Class *interfaceHead, UDATA *defaultConflictCount, UDATA interfaceCount, UDATA inheritedInterfaceCount, J9OverrideErrorData *errorData)
{
J9JavaVM *vm = vmStruct->javaVM;
J9ROMClass *romClass = taggedClass;
UDATA maxSlots;
UDATA *vTableAddress = NULL;
bool vTableAllocated = false;
PORT_ACCESS_FROM_VMC(vmStruct);
#if defined(J9VM_INTERP_HOT_CODE_REPLACEMENT)
if (((UDATA)taggedClass & ROM_METHOD_ID_TAG) == ROM_METHOD_ID_TAG) {
taggedClass = (J9ROMClass *)((UDATA)taggedClass - 1);
romClass = ((J9Class *)taggedClass)->romClass;
}
#endif
#if defined(J9VM_TRACE_VTABLE_ACCESS)
{
J9UTF8 *className = J9ROMCLASS_CLASSNAME(romClass);
j9tty_printf(PORTLIB, "\n<computeVTable: %.*s>", J9UTF8_LENGTH(className), J9UTF8_DATA(className));
}
#endif
vmStruct->tempSlot = 0;
/* Compute the absolute maximum size of the vTable and allocate it. */
if ((romClass->modifiers & J9AccInterface) == J9AccInterface) {
maxSlots = 1;
} else {
/* All methods in the current class might need new slots in the vTable. */
maxSlots = romClass->romMethodCount;
/* Add in all real method slots from the superclass. */
if (superclass != NULL) {
J9VTableHeader *superVTable = J9VTABLE_HEADER_FROM_RAM_CLASS(superclass);
maxSlots += superVTable->size;
}
/* header slots */
maxSlots += (sizeof(J9VTableHeader) / sizeof(UDATA));
/* For non-array classes, compute the total possible size of implementing all interface methods. */
if (J9ROMCLASS_IS_ARRAY(romClass) == 0) {
J9Class *interfaceWalk = interfaceHead;
while (interfaceWalk != NULL) {
maxSlots += J9INTERFACECLASS_ITABLEMETHODCOUNT(interfaceWalk);
interfaceWalk = (J9Class *)((UDATA)interfaceWalk->instanceDescription & ~INTERFACE_TAG);
}
}
}
/* convert slots to bytes */
maxSlots *= sizeof(UDATA);
#if defined(J9VM_INTERP_HOT_CODE_REPLACEMENT)
if (taggedClass != romClass) {
vTableAddress = (UDATA *)J9VTABLE_HEADER_FROM_RAM_CLASS(taggedClass);
}
#endif
if (NULL == vTableAddress) {
if (maxSlots > vm->vTableScratchSize) {
vTableAddress = (UDATA *)j9mem_allocate_memory(maxSlots, J9MEM_CATEGORY_CLASSES);
vTableAllocated = true;
} else {
vTableAddress = vm->vTableScratch;
}
}
if (NULL != vTableAddress) {
UDATA vTableMethodCount = 0;
J9VTableHeader *vTableHeader = (J9VTableHeader *)vTableAddress;
/* Write size of 0 */
if (J9AccInterface == (romClass->modifiers & J9AccInterface)) {
vTableHeader->size = 0;
goto done;
}
if (superclass == NULL) {
/* no inherited slots, write default slot in header */
vTableHeader->initialVirtualMethod = (J9Method *)vm->initialMethods.initialVirtualMethod;
vTableHeader->invokePrivateMethod = (J9Method *)vm->initialMethods.invokePrivateMethod;
} else {
J9VTableHeader *superVTable = J9VTABLE_HEADER_FROM_RAM_CLASS(superclass);
vTableMethodCount = superVTable->size;
/* + 1 to account for size slot */
memcpy(vTableAddress, superVTable, ((vTableMethodCount * sizeof(UDATA)) + sizeof(J9VTableHeader)));
}
if (J9ROMCLASS_IS_ARRAY(romClass) == 0) {
J9ROMMethod *romMethod = NULL;
UDATA romMethodIndex = 0;
UDATA count = romClass->romMethodCount;
/* Walk over ROM Methods. If the methodRemapArray is supplied, use the array as a source of
* J9ROMMethods instead of romClass->romMethods. The methodRemapArray is specified by
* HCR to ensure that the replacement class vtable has the same method order as the original class
*/
if (methodRemapArray == NULL) {
romMethod = J9ROMCLASS_ROMMETHODS(romClass);
} else {
romMethod = methodRemapArray[romMethodIndex];
}
if (count != 0) {
UDATA i;
for (i=count; i>0; i--) {
J9UTF8* methodName = J9ROMMETHOD_NAME(romMethod);
/* Check for '<' to exclude <init> from being processed */
if (J9_ARE_ANY_BITS_SET(romMethod->modifiers, J9AccMethodVTable | J9AccPrivate)
&& J9_ARE_NO_BITS_SET(romMethod->modifiers, J9AccStatic)
&& ('<' != J9UTF8_DATA(methodName)[0])
) {
vTableMethodCount = processVTableMethod(vmStruct, classLoader, vTableAddress, superclass, romClass, romMethod,
packageID, vTableMethodCount, (J9ROMMethod *)((UDATA)romMethod + ROM_METHOD_ID_TAG), errorData);
if ((UDATA)-1 == vTableMethodCount) {
goto fail;
}
}
if (i > 1) {
if (methodRemapArray == NULL) {
romMethod = nextROMMethod(romMethod);
} else {
romMethodIndex++;
romMethod = methodRemapArray[romMethodIndex];
}
}
}
}
/* TODO: optimize this so only done if the class's interfaces have defenders? */
if (interfaceCount > 0) {
UDATA totalInterfaces = interfaceCount + inheritedInterfaceCount;
J9Class *interfaceWalk = interfaceHead;
J9Class *localBuffer[LOCAL_INTERFACE_ARRAY_SIZE];
J9Class **interfaces = NULL;
J9Class **iterator = NULL;
UDATA i = 0;
if (totalInterfaces <= LOCAL_INTERFACE_ARRAY_SIZE) {
memset(localBuffer, 0, sizeof(localBuffer));
interfaces = localBuffer;
} else {
/* No memset required as interfaces will be completely initialized */
interfaces = (J9Class **)j9mem_allocate_memory(totalInterfaces * sizeof(J9Class *), J9MEM_CATEGORY_CLASSES);
if (NULL == interfaces) {
goto fail;
}
}
iterator = interfaces;
/* Add the local interfaces to interfaces[] */
while (NULL != interfaceWalk) {
*iterator = interfaceWalk;
iterator += 1;
interfaceWalk = (J9Class *)((UDATA)interfaceWalk->instanceDescription & ~INTERFACE_TAG);
}
/* Add the superclass's interfaces to interfaces[] */
if (NULL != superclass) {
J9ITable *iTableIter = (J9ITable *)superclass->iTable;
while (NULL != iTableIter) {
*iterator = iTableIter->interfaceClass;
iTableIter = iTableIter->next;
iterator += 1;
}
}
J9_SORT(interfaces, totalInterfaces, sizeof(J9Class *), &interfaceDepthCompare);
#if defined(VERBOSE_INTERFACE_METHODS)
{
J9UTF8 *className = J9ROMCLASS_CLASSNAME(romClass);
j9tty_printf(PORTLIB, "\nAdding interfaceMethods for class <%.*s> using interface[%i]=%p. #Local=%i\t#Inherited=", J9UTF8_LENGTH(className), J9UTF8_DATA(className), totalInterfaces, interfaces, interfaceCount, inheritedInterfaceCount);
}
#endif /* VERBOSE_INTERFACE_METHODS */
J9Pool *equivalentSet = pool_new(sizeof(J9EquivalentEntry), 0, 0, 0, J9_GET_CALLSITE(), J9MEM_CATEGORY_CLASSES, POOL_FOR_PORT(vm->portLibrary));
if (NULL == equivalentSet) {
/* OOM will be thrown */
goto fail;
}
UDATA equivSetCount = 0;
for (i = totalInterfaces; i > 0; i--) {
#if defined(VERBOSE_INTERFACE_METHODS)
{
J9UTF8 *className = J9ROMCLASS_CLASSNAME(interfaces[i - 1]->romClass);
j9tty_printf(PORTLIB, "\n\t<%.*s>", J9UTF8_LENGTH(className), J9UTF8_DATA(className));
}
#endif /* VERBOSE_INTERFACE_METHODS */
vTableMethodCount = addInterfaceMethods(vmStruct, classLoader, interfaces[i - 1], vTableMethodCount, vTableAddress, superclass, romClass, defaultConflictCount, equivalentSet, &equivSetCount, errorData);
if ((UDATA)-1 == vTableMethodCount) {
if (NULL != equivalentSet) {
pool_kill(equivalentSet);
}
if (interfaces != localBuffer) {
j9mem_free_memory(interfaces);
}
goto fail;
}
}
if (equivSetCount > 0) {
processEquivalentSets(vmStruct, defaultConflictCount, vTableMethodCount, vTableAddress);
}
if (NULL != equivalentSet) {
pool_kill(equivalentSet);
}
if (interfaces != localBuffer) {
j9mem_free_memory(interfaces);
}
}
/* record number of slots used */
*vTableAddress = vTableMethodCount;
}
}
done:
return vTableAddress;
fail:
if (vTableAllocated) {
j9mem_free_memory(vTableAddress);
}
vTableAddress = NULL;
goto done;
}
/**
* Copy the vTable, converting local ROM method to their RAM equivalents.
*/
static void
copyVTable(J9VMThread *vmStruct, J9Class *ramClass, J9Class *superclass, UDATA *vTable, UDATA defaultConflictCount)
{
UDATA superCount = 0;
UDATA count;
J9VTableHeader *vTableAddress;
J9Method **sourceVTable;
J9Method **newVTable;