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ROMClassBuilder.cpp
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ROMClassBuilder.cpp
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/*******************************************************************************
* Copyright IBM Corp. and others 2001
*
* 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
*******************************************************************************/
/*
* ROMClassBuilder.cpp
*/
#include "ut_j9bcu.h"
#include "bcutil_api.h"
#include "stackmap_api.h"
#include "SCQueryFunctions.h"
#include "ROMClassBuilder.hpp"
#include "AllocationStrategy.hpp"
#include "BufferManager.hpp"
#include "ClassFileOracle.hpp"
#include "ClassFileParser.hpp"
#include "ClassFileWriter.hpp"
#include "ConstantPoolMap.hpp"
#include "ComparingCursor.hpp"
#include "Cursor.hpp"
#include "J9PortAllocationStrategy.hpp"
#include "ROMClassCreationContext.hpp"
#include "ROMClassStringInternManager.hpp"
#include "ROMClassSegmentAllocationStrategy.hpp"
#include "ROMClassVerbosePhase.hpp"
#include "ROMClassWriter.hpp"
#include "SCStoreTransaction.hpp"
#include "SCStringTransaction.hpp"
#include "SRPKeyProducer.hpp"
#include "SuppliedBufferAllocationStrategy.hpp"
#include "WritingCursor.hpp"
#include "j9protos.h"
#include "ut_j9bcu.h"
static const UDATA INITIAL_CLASS_FILE_BUFFER_SIZE = 4096;
static const UDATA INITIAL_BUFFER_MANAGER_SIZE = 32768 * 10;
ROMClassBuilder::ROMClassBuilder(J9JavaVM *javaVM, J9PortLibrary *portLibrary, UDATA maxStringInternTableSize, U_8 * verifyExcludeAttribute, VerifyClassFunction verifyClassFunction) :
_javaVM(javaVM),
_portLibrary(portLibrary),
_verifyExcludeAttribute(verifyExcludeAttribute),
_verifyClassFunction(verifyClassFunction),
_classFileParserBufferSize(INITIAL_CLASS_FILE_BUFFER_SIZE),
_bufferManagerSize(INITIAL_BUFFER_MANAGER_SIZE),
_classFileBuffer(NULL),
_bufferManagerBuffer(NULL),
_anonClassNameBuffer(NULL),
_anonClassNameBufferSize(0),
_stringInternTable(javaVM, portLibrary, maxStringInternTableSize)
{
}
ROMClassBuilder::~ROMClassBuilder()
{
PORT_ACCESS_FROM_PORT(_portLibrary);
if (_javaVM != NULL && _javaVM->dynamicLoadBuffers != NULL) {
if (_javaVM->dynamicLoadBuffers->classFileError == _classFileBuffer) {
/* Set dynamicLoadBuffers->classFileError to NULL to prevent a
* crash in j9bcutil_freeAllTranslationBuffers() on JVM shutdown
*/
_javaVM->dynamicLoadBuffers->classFileError = NULL;
}
}
j9mem_free_memory(_classFileBuffer);
j9mem_free_memory(_bufferManagerBuffer);
j9mem_free_memory(_anonClassNameBuffer);
}
ROMClassBuilder *
ROMClassBuilder::getROMClassBuilder(J9PortLibrary *portLibrary, J9JavaVM *vm)
{
PORT_ACCESS_FROM_PORT(portLibrary);
ROMClassBuilder *romClassBuilder = (ROMClassBuilder *)vm->dynamicLoadBuffers->romClassBuilder;
if ( NULL == romClassBuilder ) {
romClassBuilder = (ROMClassBuilder *)j9mem_allocate_memory(sizeof(ROMClassBuilder), J9MEM_CATEGORY_CLASSES);
if ( NULL != romClassBuilder ) {
J9BytecodeVerificationData * verifyBuffers = vm->bytecodeVerificationData;
new(romClassBuilder) ROMClassBuilder(vm, portLibrary,
vm->maxInvariantLocalTableNodeCount,
(NULL == verifyBuffers ? NULL : verifyBuffers->excludeAttribute),
(NULL == verifyBuffers ? NULL : j9bcv_verifyClassStructure));
if (romClassBuilder->isOK()) {
ROMClassBuilder **romClassBuilderPtr = (ROMClassBuilder **)&(vm->dynamicLoadBuffers->romClassBuilder);
*romClassBuilderPtr = romClassBuilder;
} else {
romClassBuilder->~ROMClassBuilder();
j9mem_free_memory(romClassBuilder);
romClassBuilder = NULL;
}
}
}
return romClassBuilder;
}
extern "C" void
shutdownROMClassBuilder(J9JavaVM *vm)
{
PORT_ACCESS_FROM_JAVAVM(vm);
ROMClassBuilder *romClassBuilder = (ROMClassBuilder *)vm->dynamicLoadBuffers->romClassBuilder;
if ( NULL != romClassBuilder ) {
vm->dynamicLoadBuffers->romClassBuilder = NULL;
romClassBuilder->~ROMClassBuilder();
j9mem_free_memory(romClassBuilder);
}
}
#if defined(J9DYN_TEST)
extern "C" IDATA
j9bcutil_compareRomClass(
U_8 * classFileBytes,
U_32 classFileSize,
J9PortLibrary * portLib,
struct J9BytecodeVerificationData * verifyBuffers,
UDATA bctFlags,
UDATA bcuFlags,
J9ROMClass *romClass)
{
ROMClassBuilder romClassBuilder(NULL, portLib, 0, NULL == verifyBuffers ? NULL : verifyBuffers->excludeAttribute, NULL == verifyBuffers ? NULL : j9bcv_verifyClassStructure);
ROMClassCreationContext context(portLib, classFileBytes, classFileSize, bctFlags, bcuFlags, romClass);
return (IDATA)romClassBuilder.buildROMClass(&context);
}
#endif
extern "C" IDATA
j9bcutil_buildRomClassIntoBuffer(
U_8 * classFileBytes,
UDATA classFileSize,
J9PortLibrary * portLib,
J9BytecodeVerificationData * verifyBuffers,
UDATA bctFlags,
UDATA bcuFlags,
UDATA findClassFlags,
U_8 * romSegment,
UDATA romSegmentSize,
U_8 * lineNumberBuffer,
UDATA lineNumberBufferSize,
U_8 * varInfoBuffer,
UDATA varInfoBufferSize,
U_8 ** classFileBufferPtr
)
{
SuppliedBufferAllocationStrategy suppliedBufferAllocationStrategy(romSegment, romSegmentSize, lineNumberBuffer, lineNumberBufferSize, varInfoBuffer, varInfoBufferSize);
ROMClassBuilder romClassBuilder(NULL, portLib, 0, NULL == verifyBuffers ? NULL : verifyBuffers->excludeAttribute, NULL == verifyBuffers ? NULL : j9bcv_verifyClassStructure);
ROMClassCreationContext context(portLib, classFileBytes, classFileSize, bctFlags, bcuFlags, findClassFlags, &suppliedBufferAllocationStrategy);
IDATA result = IDATA(romClassBuilder.buildROMClass(&context));
if (NULL != classFileBufferPtr) {
*classFileBufferPtr = romClassBuilder.releaseClassFileBuffer();
}
return result;
}
extern "C" IDATA
j9bcutil_buildRomClass(J9LoadROMClassData *loadData, U_8 * intermediateData, UDATA intermediateDataLength, J9JavaVM *javaVM, UDATA bctFlags, UDATA classFileBytesReplaced, UDATA isIntermediateROMClass, J9TranslationLocalBuffer *localBuffer)
{
PORT_ACCESS_FROM_JAVAVM(javaVM);
UDATA bcuFlags = javaVM->dynamicLoadBuffers->flags;
UDATA findClassFlags = loadData->options;
ROMClassSegmentAllocationStrategy romClassSegmentAllocationStrategy(javaVM, loadData->classLoader);
ROMClassBuilder *romClassBuilder = ROMClassBuilder::getROMClassBuilder(PORTLIB, javaVM);
if (NULL == romClassBuilder) {
return BCT_ERR_OUT_OF_MEMORY;
}
ROMClassCreationContext context(
PORTLIB, javaVM, loadData->classData, loadData->classDataLength, bctFlags, bcuFlags, findClassFlags, &romClassSegmentAllocationStrategy,
loadData->className, loadData->classNameLength, loadData->hostPackageName, loadData->hostPackageLength, intermediateData, (U_32) intermediateDataLength, loadData->romClass, loadData->classBeingRedefined,
loadData->classLoader, (0 != classFileBytesReplaced), (TRUE == isIntermediateROMClass), localBuffer);
BuildResult result = romClassBuilder->buildROMClass(&context);
loadData->romClass = context.romClass();
context.reportStatistics(localBuffer);
return IDATA(result);
}
extern "C" IDATA
j9bcutil_transformROMClass(J9JavaVM *javaVM, J9PortLibrary *portLibrary, J9ROMClass *romClass, U_8 **classData, U_32 *size)
{
ClassFileWriter classFileWriter(javaVM, portLibrary, romClass);
if (classFileWriter.isOK()) {
*size = (U_32) classFileWriter.classFileSize();
*classData = classFileWriter.classFileData();
}
return IDATA(classFileWriter.getResult());
}
BuildResult
ROMClassBuilder::buildROMClass(ROMClassCreationContext *context)
{
BuildResult result = OK;
ROMClassVerbosePhase v0(context, ROMClassCreation, &result);
context->recordLoadStart();
context->recordParseClassFileStart();
ClassFileParser classFileParser(_portLibrary, _verifyClassFunction);
result = classFileParser.parseClassFile(context, &_classFileParserBufferSize, &_classFileBuffer);
context->recordParseClassFileEnd();
if ( OK == result ) {
ROMClassVerbosePhase v1(context, ROMClassTranslation, &result);
context->recordTranslationStart();
result = OutOfMemory;
while( OutOfMemory == result ) {
BufferManager bufferManager = BufferManager(_portLibrary, _bufferManagerSize, &_bufferManagerBuffer);
if (!bufferManager.isOK()) {
/*
* not enough native memory to complete this ROMClass load
*/
break;
}
result = prepareAndLaydown( &bufferManager, &classFileParser, context );
if (OutOfMemory == result) {
context->recordOutOfMemory(_bufferManagerSize);
/* Restore the original method bytecodes, as we may have transformed them. */
classFileParser.restoreOriginalMethodBytecodes();
/* set up new bufferSize for top of loop */
_bufferManagerSize = _bufferManagerSize * 2;
}
}
}
if ( OK == result ) {
context->recordTranslationEnd();
}
context->recordLoadEnd(result);
return result;
}
#if defined(J9VM_OPT_VALHALLA_VALUE_TYPES)
BuildResult
ROMClassBuilder::injectInterfaces(ClassFileOracle *classFileOracle)
{
U_32 numOfInterfaces = 0;
_interfaceInjectionInfo.numOfInterfaces = numOfInterfaces;
return OK;
}
#endif /* J9VM_OPT_VALHALLA_VALUE_TYPES */
BuildResult
ROMClassBuilder::handleAnonClassName(J9CfrClassFile *classfile, bool *isLambda, ROMClassCreationContext *context)
{
J9CfrConstantPoolInfo* constantPool = classfile->constantPool;
U_32 cpThisClassUTF8Slot = constantPool[classfile->thisClass].slot1;
U_32 originalStringLength = constantPool[cpThisClassUTF8Slot].slot1;
const char* originalStringBytes = (const char*)constantPool[cpThisClassUTF8Slot].bytes;
U_16 newUtfCPEntry = classfile->constantPoolCount - 1; /* last cpEntry is reserved for anonClassName utf */
U_32 i = 0;
BOOLEAN stringOrNASReferenceToClassName = FALSE;
BOOLEAN newCPEntry = TRUE;
BuildResult result = OK;
char buf[ROM_ADDRESS_LENGTH + 1] = {0};
U_8 *hostPackageName = context->hostPackageName();
UDATA hostPackageLength = context->hostPackageLength();
PORT_ACCESS_FROM_PORT(_portLibrary);
#if defined(J9VM_OPT_OPENJDK_METHODHANDLE)
/* InjectedInvoker is a hidden class without the strong attribute set. It
* is created by MethodHandleImpl.makeInjectedInvoker on the OpenJDK side.
* So, OpenJ9 does not have control over the implementation of InjectedInvoker.
* ROM class name for InjectedInvoker is set using the hidden class name, which
* contains the correct host class name. The below filter is used to reduce
* the number of memcmps when identifying if a hidden class is named
* InjectedInvoker. Class name for InjectedInvoker:
* - in class file bytecodes: "InjectedInvoker"; and
* - during hidden class creation: "<HOST_CLASS>$$InjectedInvoker".
*/
if (context->isClassHidden()
&& !context->isHiddenClassOptStrongSet()
/* In JDK17, InjectedInvoker does not have the nestmate attribute. In JDK18,
* InjectedInvoker has the nestmate attribute due to change in implementation.
* This filter checks for the nestmate attribute based upon the Java version
* in order to identify a InjectedInvoker class.
*/
#if JAVA_SPEC_VERSION <= 17
&& !context->isHiddenClassOptNestmateSet()
#else /* JAVA_SPEC_VERSION <= 17 */
&& context->isHiddenClassOptNestmateSet()
#endif /* JAVA_SPEC_VERSION <= 17 */
) {
#define J9_INJECTED_INVOKER_CLASSNAME "$$InjectedInvoker"
U_8 *nameData = context->className();
if (NULL != nameData) {
UDATA nameLength = context->classNameLength();
IDATA startIndex = nameLength - LITERAL_STRLEN(J9_INJECTED_INVOKER_CLASSNAME);
if (startIndex >= 0) {
/* start points to a location in class name for checking if it contains
* "$$InjectedInvoker".
*/
U_8 *start = nameData + startIndex;
if (0 == memcmp(
start, J9_INJECTED_INVOKER_CLASSNAME,
LITERAL_STRLEN(J9_INJECTED_INVOKER_CLASSNAME))
) {
originalStringBytes = (char *)nameData;
originalStringLength = (U_32)nameLength;
}
}
}
#undef J9_INJECTED_INVOKER_CLASSNAME
}
#endif /* defined(J9VM_OPT_OPENJDK_METHODHANDLE) */
/* check if adding host package name to anonymous class is needed */
UDATA newHostPackageLength = 0;
if (memcmp(originalStringBytes, hostPackageName, hostPackageLength) != 0) {
newHostPackageLength = hostPackageLength + 1;
}
UDATA newAnonClassNameLength = originalStringLength + 1 + ROM_ADDRESS_LENGTH + 1 + newHostPackageLength;
/* check if the class is a lambda class */
if (NULL != getLastDollarSignOfLambdaClassName(originalStringBytes, originalStringLength)) {
*isLambda = true;
}
/* Find if there are any Constant_String or CFR_CONSTANT_NameAndType references to the className.
* If there are none we don't need to make a new cpEntry, we can overwrite the existing
* one since the only reference to it is the classRef
* Note: The check only applies to the existing cpEntries of the constant pool rather than
* the last cpEntry (not yet initialized) for the anonClassName.
*/
for (i = 0; i < newUtfCPEntry; i++) {
if ((CFR_CONSTANT_String == constantPool[i].tag)
|| (CFR_CONSTANT_NameAndType == constantPool[i].tag)
) {
if (cpThisClassUTF8Slot == constantPool[i].slot1) {
stringOrNASReferenceToClassName = TRUE;
}
}
}
if (!stringOrNASReferenceToClassName) {
/* do not need the new cpEntry so fix up classfile->constantPoolCount */
newCPEntry = FALSE;
newUtfCPEntry = cpThisClassUTF8Slot;
classfile->constantPoolCount -= 1;
}
J9CfrConstantPoolInfo *anonClassName = &classfile->constantPool[newUtfCPEntry];
/*
* alloc an array for the new name with the following format:
* [className]/[ROMClassAddress]\0
*/
if ((0 == _anonClassNameBufferSize) || (newAnonClassNameLength > _anonClassNameBufferSize)) {
j9mem_free_memory(_anonClassNameBuffer);
_anonClassNameBuffer = (U_8 *)j9mem_allocate_memory(newAnonClassNameLength, J9MEM_CATEGORY_CLASSES);
if (NULL == _anonClassNameBuffer) {
result = OutOfMemory;
goto done;
}
_anonClassNameBufferSize = newAnonClassNameLength;
}
constantPool[newUtfCPEntry].bytes = _anonClassNameBuffer;
if (newCPEntry) {
constantPool[classfile->lastUTF8CPIndex].nextCPIndex = newUtfCPEntry;
}
/* calculate the size of the new string and create new cpEntry*/
anonClassName->slot1 = (U_32)newAnonClassNameLength - 1;
if (newCPEntry) {
anonClassName->slot2 = 0;
anonClassName->tag = CFR_CONSTANT_Utf8;
#if defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES)
/**
* The following line should be put inside if (classfile->majorVersion > 61) according to the SPEC. However, the current
* OpenJDK Valhalla implementation is not updated on this yet. There are cases that the new VT form is used in old classes
* from OpenJDK Valhalla JCL.
*/
anonClassName->flags1 |= CFR_CLASS_FILE_VERSION_SUPPORT_FLATTENABLE_VALUE_TYPE;
#else /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
anonClassName->flags1 = 0;
#endif /* defined(J9VM_OPT_VALHALLA_FLATTENABLE_VALUE_TYPES) */
anonClassName->nextCPIndex = 0;
anonClassName->romAddress = 0;
}
constantPool[classfile->thisClass].slot1 = newUtfCPEntry;
/* copy the name into the new location and add the special character, fill the rest with zeroes */
if (newHostPackageLength > 0 ) {
memcpy(constantPool[newUtfCPEntry].bytes, hostPackageName, newHostPackageLength - 1);
*(U_8*)((UDATA) constantPool[newUtfCPEntry].bytes + newHostPackageLength - 1) = ANON_CLASSNAME_CHARACTER_SEPARATOR;
}
memcpy (constantPool[newUtfCPEntry].bytes + newHostPackageLength, originalStringBytes, originalStringLength);
*(U_8*)((UDATA) constantPool[newUtfCPEntry].bytes + newHostPackageLength + originalStringLength) = ANON_CLASSNAME_CHARACTER_SEPARATOR;
/*
* 0x<romAddress> will be appended to anon/hidden class name.
* Initialize the 0x<romAddress> part to 0x00000000 or 0x0000000000000000 (depending on the platforms).
*/
j9str_printf(PORTLIB, buf, ROM_ADDRESS_LENGTH + 1, ROM_ADDRESS_FORMAT, 0);
memcpy(constantPool[newUtfCPEntry].bytes + newHostPackageLength + originalStringLength + 1, buf, ROM_ADDRESS_LENGTH + 1);
/* search constantpool for all other identical classRefs. We have not actually
* tested this scenario as javac will not output more than one classRef or utfRef of the
* same kind.
*/
for (i = 0; i < classfile->constantPoolCount; i++) {
if (CFR_CONSTANT_Class == constantPool[i].tag) {
U_32 classNameSlot = constantPool[i].slot1;
if (classNameSlot != newUtfCPEntry) {
U_32 classNameLength = constantPool[classNameSlot].slot1;
if (J9UTF8_DATA_EQUALS(originalStringBytes, originalStringLength,
constantPool[classNameSlot].bytes, classNameLength))
{
/* if it is the same class, point to original class name slot */
constantPool[i].slot1 = newUtfCPEntry;
}
}
}
}
done:
return result;
}
U_8 *
ROMClassBuilder::releaseClassFileBuffer()
{
U_8 *result = _classFileBuffer;
_classFileBuffer = NULL;
return result;
}
void
ROMClassBuilder::getSizeInfo(ROMClassCreationContext *context, ROMClassWriter *romClassWriter, SRPOffsetTable *srpOffsetTable, bool *countDebugDataOutOfLine, SizeInformation *sizeInformation)
{
/* create a new scope to allow the ROMClassVerbosePhase to properly record the amount of time spent in
* preparation */
ROMClassVerbosePhase v(context, PrepareROMClass);
Cursor mainAreaCursor(RC_TAG, srpOffsetTable, context);
Cursor lineNumberCursor(LINE_NUMBER_TAG, srpOffsetTable, context);
Cursor variableInfoCursor(VARIABLE_INFO_TAG, srpOffsetTable, context);
Cursor utf8Cursor(UTF8_TAG, srpOffsetTable, context);
Cursor classDataCursor(INTERMEDIATE_TAG, srpOffsetTable, context);
/*
* The need to have separate lineNumber and variableInfo Cursors from mainAreaCursor only exists
* if it is possible to place debug information out of line. That is currently only done when
* shared classes is enabled and it is possible to share the class OR when the allocation strategy
* permits it.
*/
if (context->canPossiblyStoreDebugInfoOutOfLine()) {
/* It's possible that debug information can be stored out of line.
* Calculate sizes and offsets with out of line debug information.*/
*countDebugDataOutOfLine = true;
romClassWriter
->writeROMClass(&mainAreaCursor,
&lineNumberCursor,
&variableInfoCursor,
&utf8Cursor,
(context->isIntermediateDataAClassfile()) ? &classDataCursor : NULL,
0, 0, 0, 0,
ROMClassWriter::MARK_AND_COUNT_ONLY);
} else {
context->forceDebugDataInLine();
romClassWriter
->writeROMClass(&mainAreaCursor,
&mainAreaCursor,
&mainAreaCursor,
&utf8Cursor,
(context->isIntermediateDataAClassfile()) ? &classDataCursor : NULL,
0, 0, 0, 0,
ROMClassWriter::MARK_AND_COUNT_ONLY);
}
/* NOTE: the size of the VarHandle MethodType lookup table is already included in
* rcWithOutUTF8sSize; see ROMClassWriter::writeVarHandleMethodTypeLookupTable().
* VarHandleMethodTypeLookupTable is disabled for OpenJDK MethodHandles because
* it is not used.
*/
sizeInformation->rcWithOutUTF8sSize = mainAreaCursor.getCount();
sizeInformation->lineNumberSize = lineNumberCursor.getCount();
sizeInformation->variableInfoSize = variableInfoCursor.getCount();
sizeInformation->utf8sSize = utf8Cursor.getCount();
/* In case of intermediateData being stored as ROMClass, rawClassDataSize will be 0. */
sizeInformation->rawClassDataSize = classDataCursor.getCount();
}
BuildResult
ROMClassBuilder::prepareAndLaydown( BufferManager *bufferManager, ClassFileParser *classFileParser, ROMClassCreationContext *context )
{
bool countDebugDataOutOfLine = false;
BuildResult result = OK;
ROMClassVerbosePhase v0(context, ROMClassPrepareAndLayDown, &result);
PORT_ACCESS_FROM_PORT(_portLibrary);
/*
* If retransforming is enabled, intermediate class data is laid down after the first corresponding ROMClass.
* When a ROMClass is retransformed, the intermediateClassData of the new ROMClass points to the data laid down
* after the old ROMClass. Hence we only lay down intermediate class data if retransforming is enabled, but we
* are not currently retransforming.
*
* With -Xshareclasses:enableBCI sub-option, intermediateClassData is laid down for every ROMClass which is not
* modified by the BCI agent.
*/
Trc_BCU_Assert_False(context->isRetransforming() && !context->isRetransformAllowed());
bool isLambda = false;
if (context->isClassAnon() || context->isClassHidden()) {
BuildResult res = handleAnonClassName(classFileParser->getParsedClassFile(), &isLambda, context);
if (OK != res) {
return res;
}
}
ConstantPoolMap constantPoolMap(bufferManager, context);
ClassFileOracle classFileOracle(bufferManager, classFileParser->getParsedClassFile(), &constantPoolMap, _verifyExcludeAttribute, _classFileBuffer, context);
if ( !classFileOracle.isOK() ) {
return classFileOracle.getBuildResult();
}
#if defined(J9VM_OPT_VALHALLA_VALUE_TYPES)
result = injectInterfaces(&classFileOracle);
if (OK != result) {
return result;
}
SRPKeyProducer srpKeyProducer(&classFileOracle, &_interfaceInjectionInfo);
#else /* J9VM_OPT_VALHALLA_VALUE_TYPES */
SRPKeyProducer srpKeyProducer(&classFileOracle);
#endif /* J9VM_OPT_VALHALLA_VALUE_TYPES */
/*
* The ROMClassWriter must be constructed before the SRPOffsetTable because it generates additional SRP keys.
* There must be no SRP keys generated after the SRPOffsetTable is initialized.
*/
#if defined(J9VM_OPT_VALHALLA_VALUE_TYPES)
ROMClassWriter romClassWriter(bufferManager, &classFileOracle, &srpKeyProducer, &constantPoolMap, context, &_interfaceInjectionInfo);
#else /* J9VM_OPT_VALHALLA_VALUE_TYPES */
ROMClassWriter romClassWriter(bufferManager, &classFileOracle, &srpKeyProducer, &constantPoolMap, context);
#endif /* J9VM_OPT_VALHALLA_VALUE_TYPES */
if ( !romClassWriter.isOK() ) {
return romClassWriter.getBuildResult();
}
SRPOffsetTable srpOffsetTable(&srpKeyProducer, bufferManager, MAX_TAG, context);
if ( !srpOffsetTable.isOK() ) {
return srpOffsetTable.getBuildResult();
}
/* Pass the SRPOffsetTable to the ROMClassWriter to complete its initialization. */
romClassWriter.setSRPOffsetTable(&srpOffsetTable);
U_32 modifiers = classFileOracle.getAccessFlags();
U_32 extraModifiers = computeExtraModifiers(&classFileOracle, context);
U_32 optionalFlags = computeOptionalFlags(&classFileOracle, context);
/*
* calculate the amount of space required to write out this ROMClass without UTF8s
* and calculate the maximum amount of space required for UTF8s
* also prepare the SRP offset information
*/
SizeInformation sizeInformation;
getSizeInfo(context, &romClassWriter, &srpOffsetTable, &countDebugDataOutOfLine, &sizeInformation);
U_32 romSize = 0;
U_32 sizeToCompareForLambda = 0;
if (isLambda) {
/*
* romSize calculated from getSizeInfo() does not involve StringInternManager. It is only accurate for string intern disabled classes.
* Lambda classes in java 15 and up are strong hidden classes (defined with Option.STONG), which has the same lifecycle as its
* defining class loader. It is string intern enabled. So pass classFileSize instead of romSize to sizeToCompareForLambda.
*/
sizeToCompareForLambda = classFileOracle.getClassFileSize();
}
if ( context->shouldCompareROMClassForEquality() ) {
ROMClassVerbosePhase v(context, CompareHashtableROMClass);
/*
* Check if the supplied ROMClass is identical to the one being created. If it is, simply return OK.
*
* This is done either when there is an orphan ROM class (without a RAM class) that has been created
* previously, or for ROMClass comparison on behalf of dyntest.
*/
J9ROMClass *romClass = context->romClass();
bool romClassIsShared = (j9shr_Query_IsAddressInCache(_javaVM, romClass, romClass->romSize) ? true : false);
if (compareROMClassForEquality((U_8*)romClass, romClassIsShared, &romClassWriter,
&srpOffsetTable, &srpKeyProducer, &classFileOracle, modifiers, extraModifiers, optionalFlags, context, sizeToCompareForLambda, isLambda)
) {
return OK;
} else {
/* ROM classes not equal so remove from creation context */
context->recordROMClass(NULL);
/* need to recalculate size info and srp offsets, as comparing may have added bogus debug info */
srpOffsetTable.clear();
getSizeInfo(context, &romClassWriter, &srpOffsetTable, &countDebugDataOutOfLine, &sizeInformation);
}
#if defined(J9DYN_TEST)
if (NULL == context->allocationStrategy()) {
/*
* No allocationStrategy is a dyntest request to compare to the existing ROMClass supplied in romClassPtr.
*/
return GenericError;
}
#endif
}
UDATA maxRequiredSize = sizeInformation.rcWithOutUTF8sSize +
sizeInformation.lineNumberSize +
sizeInformation.variableInfoSize +
sizeInformation.utf8sSize +
sizeInformation.rawClassDataSize;
#if defined(J9VM_OPT_SHARED_CLASSES)
if (context->isROMClassShareable()) {
UDATA loadType = J9SHR_LOADTYPE_NORMAL;
if (context->isRedefining()) {
loadType = J9SHR_LOADTYPE_REDEFINED;
} else if (context->isRetransforming()) {
loadType = J9SHR_LOADTYPE_RETRANSFORMED;
} else if (context->isClassUnsafe()
|| context->isClassHidden()
|| (LOAD_LOCATION_UNKNOWN == context->loadLocation())
) {
/* For redefining/transforming, we still want loadType to be J9SHR_LOADTYPE_REDEFINED/J9SHR_LOADTYPE_RETRANSFORMED,
* so put these checks after the redefining/transforming checks.
*/
loadType = J9SHR_LOADTYPE_NOT_FROM_PATH;
}
SCStoreTransaction sharedStoreClassTransaction =
SCStoreTransaction(context->currentVMThread(),
context->classLoader(),
context->cpIndex(),
loadType,
classFileOracle.getUTF8Length(classFileOracle.getClassNameIndex()), classFileOracle.getUTF8Data(classFileOracle.getClassNameIndex()),
context->classFileBytesReplaced(),
context->isCreatingIntermediateROMClass());
if ( sharedStoreClassTransaction.isOK() ) {
/*
* Shared Classes is enabled, there may be an existing ROMClass
* that can be used in place of the one being created.
*
* Attempt to find it.
*
* Note: When comparing classes it is expected that the context contains the
* rom class being compared to. 'prevROMClass' is used to backup the romClass
* currently in the context, so the compare loop can set the romClass in the
* context accordingly.
*/
J9ROMClass * prevROMClass = context->romClass();
for (
J9ROMClass *existingROMClass = sharedStoreClassTransaction.nextSharedClassForCompare();
NULL != existingROMClass;
existingROMClass = sharedStoreClassTransaction.nextSharedClassForCompare()
) {
ROMClassVerbosePhase v(context, CompareSharedROMClass);
if (!context->isIntermediateDataAClassfile()
&& ((U_8 *)existingROMClass == context->intermediateClassData())
) {
/* 'existingROMClass' is same as the ROMClass corresponding to intermediate class data.
* Based on the assumption that an agent is actually modifying the class file
* instead of just returning a copy of the classbytes it receives,
* this comparison can be avoided.
*/
continue;
}
context->recordROMClass(existingROMClass);
if (compareROMClassForEquality((U_8*)existingROMClass, /* romClassIsShared = */ true, &romClassWriter,
&srpOffsetTable, &srpKeyProducer, &classFileOracle, modifiers, extraModifiers, optionalFlags, context, sizeToCompareForLambda, isLambda)
) {
/*
* Found an existing ROMClass in the shared cache that is equivalent
* to the ROMClass that was about to be created.
* Make the found ROMClass available to our caller and leave the routine.
*/
/* no need to checkDebugInfoCompression when class comes from sharedClassCache since the romClass
* was validated when in was placed in the sharedClassCache */
return OK;
}
}
context->recordROMClass(prevROMClass);
/*
* A shared ROMClass equivalent to the one being created was NOT found.
*
* Attempt to obtain space in the shared cache to laydown (i.e., share)
* the ROMClass being created.
*/
ROMClassVerbosePhase v(context, CreateSharedClass);
J9RomClassRequirements sizeRequirements;
sizeRequirements.romClassMinimalSize =
U_32(sizeInformation.rcWithOutUTF8sSize
+ sizeInformation.utf8sSize + sizeInformation.rawClassDataSize);
sizeRequirements.romClassMinimalSize = ROUND_UP_TO_POWEROF2(sizeRequirements.romClassMinimalSize, sizeof(U_64));
sizeRequirements.romClassSizeFullSize =
U_32(sizeRequirements.romClassMinimalSize
+ sizeInformation.lineNumberSize
+ sizeInformation.variableInfoSize);
sizeRequirements.romClassSizeFullSize = ROUND_UP_TO_POWEROF2(sizeRequirements.romClassSizeFullSize, sizeof(U_64));
sizeRequirements.lineNumberTableSize = U_32(sizeInformation.lineNumberSize);
sizeRequirements.localVariableTableSize = U_32(sizeInformation.variableInfoSize);
/*
* Check sharedStoreClassTransaction.isCacheFull() here because for performance concerns on a full cache, we don't have write mutex if the cache is full/soft full.
* Without this check, j9shr_classStoreTransaction_createSharedClass() does not guarantee returning on checking J9SHR_RUNTIMEFLAG_AVAILABLE_SPACE_FULL in runtimeFlags,
* as another thread that has write mutex may unset this flag, leading to unexpected write operation to the cache without the write mutex.
*/
if (!sharedStoreClassTransaction.isCacheFull()) {
if ( sharedStoreClassTransaction.allocateSharedClass(&sizeRequirements) ){
U_8 *romClassBuffer = (U_8*)sharedStoreClassTransaction.getRomClass();
/*
* Make note that the laydown is occurring in SharedClasses
*/
romSize = finishPrepareAndLaydown(
(U_8*)sharedStoreClassTransaction.getRomClass(),
(U_8*)sharedStoreClassTransaction.getLineNumberTable(),
(U_8*)sharedStoreClassTransaction.getLocalVariableTable(),
&sizeInformation, modifiers, extraModifiers, optionalFlags,
true, sharedStoreClassTransaction.hasSharedStringTableLock(),
&classFileOracle, &srpOffsetTable, &srpKeyProducer, &romClassWriter,
context, &constantPoolMap
);
fixReturnBytecodes(_portLibrary, (J9ROMClass *)romClassBuffer);
/*
* inform the shared class transaction what the final ROMSize is
*/
sharedStoreClassTransaction.updateSharedClassSize(romSize);
context->recordROMClass((J9ROMClass *)romClassBuffer);
if ((NULL != _javaVM) && (_javaVM->extendedRuntimeFlags & J9_EXTENDED_RUNTIME_CHECK_DEBUG_INFO_COMPRESSION)) {
checkDebugInfoCompression((J9ROMClass *)romClassBuffer, classFileOracle, &srpKeyProducer, &constantPoolMap, &srpOffsetTable);
}
return OK;
}
/* If sharedStoreClassTransaction.allocateSharedClass() returned false due to the shared cache softmx, unstored bytes is increased inside
* SH_CompositeCacheImpl::allocate(). No need to call sharedStoreClassTransaction.updateUnstoredBytes() here.
*/
} else {
sharedStoreClassTransaction.updateUnstoredBytes(sizeRequirements.romClassSizeFullSize);
}
}
/*
* There is insufficient space available in the shared cache
* to accommodate the ROMClass that is being built.
*
* Terminate the attempted Store Class Transaction.
*
* Simply exit the scope. This will invoke the destructor for
* sharedStoreClassTransaction and terminate the transaction.
*/
}
if (context->isIntermediateDataAClassfile()) {
/* For some reason we are not storing ROMClass in the cache.
* In case we earlier decided to store Intermediate Class File bytes along with ROMClass,
* need to check if we still need them. If not, modify sizeRequirements accordingly.
*
* We don't need to store Intermediate Class File if we fail to store ROMClass in the cache
* when running with -Xshareclasses:enableBCI and class file bytes are not modified and re-transformation is not enabled.
*/
if (context->shouldStripIntermediateClassData()) {
maxRequiredSize -= sizeInformation.rawClassDataSize;
sizeInformation.rawClassDataSize = 0;
}
/* In case ROMClass is not stored in cache, and we are re-transforming,
* try to re-use intermediateClassData from existing ROMClass.
*/
if (false == context->isReusingIntermediateClassData()) {
romClassWriter.reuseIntermediateClassData();
/* Modify size requirements if we are able to reuse intermediate class data now */
if (true == context->isReusingIntermediateClassData()) {
maxRequiredSize -= sizeInformation.rawClassDataSize;
sizeInformation.rawClassDataSize = 0;
}
}
}
#endif /* J9VM_OPT_SHARED_CLASSES */
/*
* Shared Classes is disabled, unavailable, or failed; use the regular allocation strategy.
*/
/*
* request the maximum amount of space to laydown this ROMClass
*/
U_8 *romClassBuffer = NULL;
U_8 *lineNumberBuffer = NULL;
U_8 *variableInfoBuffer = NULL;
AllocationStrategy::AllocatedBuffers allocatedBuffers;
if ( context->allocationStrategy()->allocateWithOutOfLineData( &allocatedBuffers,
sizeInformation.rcWithOutUTF8sSize + sizeInformation.utf8sSize + sizeInformation.rawClassDataSize,
sizeInformation.lineNumberSize, sizeInformation.variableInfoSize)
) {
romClassBuffer = allocatedBuffers.romClassBuffer;
lineNumberBuffer = allocatedBuffers.lineNumberBuffer;
variableInfoBuffer = allocatedBuffers.variableInfoBuffer;
} else {
/* Pad maxRequiredSize to the size to sizeof(U_64) in order to prevent memory corruption.
* This mirrors ROM class padding in finishPrepareAndLaydown when the final ROM class size
* is calculated.
*/
maxRequiredSize = ROUND_UP_TO_POWEROF2(maxRequiredSize, sizeof(U_64));
romClassBuffer = context->allocationStrategy()->allocate(maxRequiredSize);
}
if ( romClassBuffer == NULL ) {
return OutOfROM;
}
/*
* Use an if statement here and call finishPrepareAndLaydown() in both cases to allow the scope of SCStringTransaction() to survive the life of the call to
* finishPrepareAndLaydown(). Otherwise, the scope of SCStringTransaction() would end early and it would not be safe to us interned strings.
*/
if (J9_ARE_ANY_BITS_SET(context->findClassFlags(), J9_FINDCLASS_FLAG_ANON | J9_FINDCLASS_FLAG_HIDDEN)) {
U_16 classNameIndex = classFileOracle.getClassNameIndex();
U_8* classNameBytes = classFileOracle.getUTF8Data(classNameIndex);
U_16 classNameFullLength = classFileOracle.getUTF8Length(classNameIndex);
U_16 classNameRealLenghth = classNameFullLength - ROM_ADDRESS_LENGTH;
char* nameString = NULL;
char message[ROM_ADDRESS_LENGTH + 1];
if (J9_ARE_ALL_BITS_SET(context->findClassFlags(), J9_FINDCLASS_FLAG_REDEFINING)
|| J9_ARE_ALL_BITS_SET(context->findClassFlags(), J9_FINDCLASS_FLAG_RETRANSFORMING)
) {
/* When redefining we need to use the original class name */
nameString = ((char*) context->className() + classNameRealLenghth);
} else {
/* fix up the ROM className with segment Address
* write the name into a buffer first because j9str_printf automatically adds a NULL terminator
* at the end, and J9UTF8 are not NULL terminated
*/
j9str_printf(PORTLIB, message, ROM_ADDRESS_LENGTH + 1, ROM_ADDRESS_FORMAT, (UDATA)romClassBuffer);
nameString = (char*) message;
}
memcpy((char*) (classNameBytes + classNameRealLenghth), nameString, ROM_ADDRESS_LENGTH);
}
#if defined(J9VM_OPT_SHARED_CLASSES)
if (NULL != context->javaVM()) {
SCStringTransaction scStringTransaction = SCStringTransaction(context->currentVMThread());
romSize = finishPrepareAndLaydown(romClassBuffer, lineNumberBuffer, variableInfoBuffer, &sizeInformation, modifiers, extraModifiers, optionalFlags,
false, scStringTransaction.isOK(), &classFileOracle, &srpOffsetTable, &srpKeyProducer, &romClassWriter, context, &constantPoolMap);
} else
#endif
{
romSize = finishPrepareAndLaydown(romClassBuffer, lineNumberBuffer, variableInfoBuffer, &sizeInformation, modifiers, extraModifiers, optionalFlags,
false, false, &classFileOracle, &srpOffsetTable, &srpKeyProducer, &romClassWriter, context, &constantPoolMap);
}
/* This assert will detect memory corruption when a new segment
* for the ROM class was allocated using maxRequiredSize.
*/
Trc_BCU_Assert_True_Level1(romSize <= maxRequiredSize);
/*
* inform the allocator what the final ROMSize is
*/
if (J9_ARE_ALL_BITS_SET(context->findClassFlags(), J9_FINDCLASS_FLAG_ANON)) {
/* for anonClasses lie about the size report that it is full so no one else can use the segment */
romSize = (U_32) ((ROMClassSegmentAllocationStrategy*) context->allocationStrategy())->getSegmentSize();
}
context->allocationStrategy()->updateFinalROMSize(romSize);
context->recordROMClass((J9ROMClass *)romClassBuffer);
if ((NULL != _javaVM) && (_javaVM->extendedRuntimeFlags & J9_EXTENDED_RUNTIME_CHECK_DEBUG_INFO_COMPRESSION)) {
checkDebugInfoCompression((J9ROMClass *)romClassBuffer, classFileOracle, &srpKeyProducer, &constantPoolMap, &srpOffsetTable);
}
return OK;
}
/*
* Test the compression of the ROMclass'debug information when running the command
* Tests the line number compression and the local variable table compression
* -Xcheck:vm:debuginfo
*/
void
ROMClassBuilder::checkDebugInfoCompression(J9ROMClass *romClass, ClassFileOracle classFileOracle, SRPKeyProducer *srpKeyProducer, ConstantPoolMap *constantPoolMap, SRPOffsetTable *srpOffsetTable)
{
PORT_ACCESS_FROM_PORT(_portLibrary);
J9ROMMethod *currentMethod;
currentMethod = (J9ROMMethod*)(J9ROMCLASS_ROMMETHODS(romClass));
for (ClassFileOracle::MethodIterator methodIterator = classFileOracle.getMethodIterator();
methodIterator.isNotDone();
methodIterator.next()) {
/* 1) Test the line number compression */
UDATA lineNumbersInfoSize = methodIterator.getLineNumbersCount() * sizeof (J9CfrLineNumberTableEntry);
if (0 != lineNumbersInfoSize) {
J9CfrLineNumberTableEntry *lineNumbersInfo = (J9CfrLineNumberTableEntry*)j9mem_allocate_memory(lineNumbersInfoSize, J9MEM_CATEGORY_CLASSES);
if (NULL != lineNumbersInfo) {
classFileOracle.sortLineNumberTable(methodIterator.getIndex(), lineNumbersInfo);
J9LineNumber lineNumber;
lineNumber.lineNumber = 0;
lineNumber.location = 0;
J9MethodDebugInfo *methodInfo = getMethodDebugInfoFromROMMethod(currentMethod);
if (NULL != methodInfo) {
U_8 *currentLineNumber = getLineNumberTable(methodInfo);
U_32 lineNumbersCount = getLineNumberCount(methodInfo);
UDATA index;
Trc_BCU_Assert_CorrectLineNumbersCount(lineNumbersCount, methodIterator.getLineNumbersCount());
if (0 != lineNumbersCount) {
for (index = 0; index < lineNumbersCount; index++) {
/* From the original class */
U_32 pcOriginal = lineNumbersInfo[index].startPC;
U_32 lineNumberOriginal = lineNumbersInfo[index].lineNumber;
/* From the compressed class */
getNextLineNumberFromTable(¤tLineNumber, &lineNumber);
if ((lineNumber.lineNumber != lineNumberOriginal) || (lineNumber.location != pcOriginal)) {
J9UTF8* name = J9ROMCLASS_CLASSNAME(romClass);
PORT_ACCESS_FROM_PORT(_portLibrary);
j9tty_printf(PORTLIB, "Error while uncompressing the debug information for the class %.*s\n", (UDATA)J9UTF8_LENGTH(name), J9UTF8_DATA(name));
j9tty_printf(PORTLIB, "lineNumber.lineNumber(%d) / lineNumberOriginal(%d)\n", lineNumber.lineNumber,lineNumberOriginal);
j9tty_printf(PORTLIB, "lineNumber.location(%d) / pcOriginal(%d)\n", lineNumber.location, pcOriginal);
Trc_BCU_Assert_ShouldNeverHappen_CompressionMissmatch();
}
}
}
}
j9mem_free_memory(lineNumbersInfo);
} else {
Trc_BCU_Assert_Compression_OutOfMemory();
}
}
/* 2) Test local variable table compression */
U_32 localVariablesCount = methodIterator.getLocalVariablesCount();
if (0 != localVariablesCount) {
J9MethodDebugInfo *methodDebugInfo = getMethodDebugInfoFromROMMethod(currentMethod);
if (NULL != methodDebugInfo) {
J9VariableInfoWalkState state;
J9VariableInfoValues *values = NULL;
Trc_BCU_Assert_Equals_Level1(methodDebugInfo->varInfoCount, localVariablesCount);
values = variableInfoStartDo(methodDebugInfo, &state);
if (NULL != values) {
for (ClassFileOracle::LocalVariablesIterator localVariablesIterator = methodIterator.getLocalVariablesIterator();
localVariablesIterator.isNotDone();
localVariablesIterator.next()) {
if (NULL == values) {
/* The number of compressed variableTableInfo is less than the original number */
Trc_BCU_Assert_ShouldNeverHappen_CompressionMissmatch();
}
Trc_BCU_Assert_Equals_Level1(values->startVisibility, localVariablesIterator.getStartPC());
Trc_BCU_Assert_Equals_Level1(values->visibilityLength, localVariablesIterator.getLength());
Trc_BCU_Assert_Equals_Level1(values->slotNumber, localVariablesIterator.getIndex());
Trc_BCU_Assert_Equals_Level1(
(J9UTF8*)(values->name),
(J9UTF8*)(srpOffsetTable->computeWSRP(srpKeyProducer->mapCfrConstantPoolIndexToKey(localVariablesIterator.getNameIndex()), 0))
);
Trc_BCU_Assert_Equals_Level1(
(J9UTF8*)(values->signature),
(J9UTF8*)(srpOffsetTable->computeWSRP(srpKeyProducer->mapCfrConstantPoolIndexToKey(localVariablesIterator.getDescriptorIndex()), 0))
);
if (localVariablesIterator.hasGenericSignature()) {
Trc_BCU_Assert_Equals_Level1(
(J9UTF8*)(values->genericSignature),
(J9UTF8*)(srpOffsetTable->computeWSRP(srpKeyProducer->mapCfrConstantPoolIndexToKey(localVariablesIterator.getGenericSignatureIndex()), 0))
);
} else {
Trc_BCU_Assert_Equals_Level1((J9UTF8*)(values->genericSignature), NULL);
}
values = variableInfoNextDo(&state);
}
}
}
}
/* 3) next method */
currentMethod = nextROMMethod(currentMethod);
}
}
U_32
ROMClassBuilder::finishPrepareAndLaydown(
U_8 *romClassBuffer,
U_8 *lineNumberBuffer,