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MHInterpreter.inc
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/*******************************************************************************
* Copyright (c) 2001, 2020 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#include "clang_comp.h"
#include "j9cfg.h"
#include "VM_MethodHandleKinds.h"
#include "MHInterpreter.hpp"
#include "VMAccess.hpp"
#if defined(MH_TRACE)
static const char * names[] = {
"J9_METHOD_HANDLE_KIND_BOUND",
"J9_METHOD_HANDLE_KIND_GET_FIELD",
"J9_METHOD_HANDLE_KIND_GET_STATIC_FIELD",
"J9_METHOD_HANDLE_KIND_PUT_FIELD",
"J9_METHOD_HANDLE_KIND_PUT_STATIC_FIELD",
"J9_METHOD_HANDLE_KIND_VIRTUAL",
"J9_METHOD_HANDLE_KIND_STATIC",
"J9_METHOD_HANDLE_KIND_SPECIAL",
"J9_METHOD_HANDLE_KIND_CONSTRUCTOR",
"J9_METHOD_HANDLE_KIND_INTERFACE",
"J9_METHOD_HANDLE_KIND_COLLECT",
"J9_METHOD_HANDLE_KIND_INVOKE_EXACT",
"J9_METHOD_HANDLE_KIND_INVOKE_GENERIC",
"J9_METHOD_HANDLE_KIND_ASTYPE",
"J9_METHOD_HANDLE_KIND_DYNAMIC_INVOKER",
"J9_METHOD_HANDLE_KIND_FILTER_RETURN",
"J9_METHOD_HANDLE_KIND_EXPLICITCAST",
"J9_METHOD_HANDLE_KIND_VARARGS_COLLECTOR",
"J9_METHOD_HANDLE_KIND_PASSTHROUGH",
"J9_METHOD_HANDLE_KIND_SPREAD",
"J9_METHOD_HANDLE_KIND_INSERT",
"J9_METHOD_HANDLE_KIND_PERMUTE",
"J9_METHOD_HANDLE_KIND_CONSTANT_OBJECT",
"J9_METHOD_HANDLE_KIND_CONSTANT_INT",
"J9_METHOD_HANDLE_KIND_CONSTANT_FLOAT",
"J9_METHOD_HANDLE_KIND_CONSTANT_LONG",
"J9_METHOD_HANDLE_KIND_CONSTANT_DOUBLE",
"J9_METHOD_HANDLE_KIND_FOLD_HANDLE",
"J9_METHOD_HANDLE_KIND_GUARD_WITH_TEST",
"J9_METHOD_HANDLE_KIND_FILTER_ARGUMENTS",
"J9_METHOD_HANDLE_KIND_VARHANDLE_INVOKE_EXACT",
"J9_METHOD_HANDLE_KIND_VARHANDLE_INVOKE_GENERIC",
/* #ifdef J9VM_OPT_PANAMA */
"J9_METHOD_HANDLE_KIND_NATIVE",
/* #else */
"",
/* #endif J9VM_OPT_PANAMA */
"J9_METHOD_HANDLE_KIND_FILTER_ARGUMENTS_WITH_COMBINER",
};
#endif /* MH_TRACE */
VM_BytecodeAction
VM_MHInterpreter::dispatchLoop(j9object_t methodHandle)
{
VM_BytecodeAction nextAction = EXECUTE_BYTECODE;
J9Method *method = NULL;
while(true) {
U_32 kind = getMethodHandleKind(methodHandle);
Assert_VM_mhStackHandleMatch(doesMHandStackMHMatch(methodHandle));
#if defined(MH_TRACE)
printf("#(%p)# dispatchLoop: MH=%p\tkind=%x\t%s\n", _currentThread, methodHandle, kind, names[kind]);
#endif
switch(kind) {
case J9_METHOD_HANDLE_KIND_CONSTANT_OBJECT:
dropAllArgumentsLeavingMH(methodHandle);
*((j9object_t *) _currentThread->sp) = J9VMJAVALANGINVOKECONSTANTOBJECTHANDLE_VALUE(_currentThread, methodHandle);
goto returnFromSend;
case J9_METHOD_HANDLE_KIND_CONSTANT_INT:
dropAllArgumentsLeavingMH(methodHandle);
*((I_32 *) _currentThread->sp) = J9VMJAVALANGINVOKECONSTANTINTHANDLE_VALUE(_currentThread, methodHandle);
goto returnFromSend;
case J9_METHOD_HANDLE_KIND_CONSTANT_FLOAT:
dropAllArgumentsLeavingMH(methodHandle);
*((U_32 *) _currentThread->sp) = J9VMJAVALANGINVOKECONSTANTFLOATHANDLE_VALUE(_currentThread, methodHandle);
goto returnFromSend;
case J9_METHOD_HANDLE_KIND_CONSTANT_LONG:
dropAllArgumentsLeavingMH(methodHandle);
_currentThread->sp -= 1;
*((I_64 *) _currentThread->sp) = J9VMJAVALANGINVOKECONSTANTLONGHANDLE_VALUE(_currentThread, methodHandle);
goto returnFromSend;
case J9_METHOD_HANDLE_KIND_CONSTANT_DOUBLE:
dropAllArgumentsLeavingMH(methodHandle);
_currentThread->sp -= 1;
*((U_64 *) _currentThread->sp) = J9VMJAVALANGINVOKECONSTANTDOUBLEHANDLE_VALUE(_currentThread, methodHandle);
goto returnFromSend;
case J9_METHOD_HANDLE_KIND_EXPLICITCAST: /* fall through */
case J9_METHOD_HANDLE_KIND_ASTYPE:
methodHandle = convertArgumentsForAsType(methodHandle);
if (VM_VMHelpers::exceptionPending(_currentThread)) {
goto throwCurrentException;
}
break;
case J9_METHOD_HANDLE_KIND_SPREAD:
methodHandle = spreadForAsSpreader(methodHandle);
if (VM_VMHelpers::exceptionPending(_currentThread)) {
goto throwCurrentException;
}
break;
case J9_METHOD_HANDLE_KIND_PERMUTE:
methodHandle = permuteForPermuteHandle(methodHandle);
if (VM_VMHelpers::exceptionPending(_currentThread)) {
goto throwCurrentException;
}
break;
case J9_METHOD_HANDLE_KIND_INSERT:
methodHandle = insertArgumentsForInsertHandle(methodHandle);
if (VM_VMHelpers::exceptionPending(_currentThread)) {
goto throwCurrentException;
}
break;
case J9_METHOD_HANDLE_KIND_PASSTHROUGH: {
j9object_t type = getMethodHandleMethodType(methodHandle);
U_32 slotCount = getMethodTypeArgSlots(type);
methodHandle = J9VMJAVALANGINVOKEPASSTHROUGHHANDLE_EQUIVALENT(_currentThread, methodHandle);
((j9object_t *)_currentThread->sp)[slotCount] = methodHandle;
break;
}
case J9_METHOD_HANDLE_KIND_VARARGS_COLLECTOR: {
j9object_t type = getMethodHandleMethodType(methodHandle);
U_32 slotCount = getMethodTypeArgSlots(type);
methodHandle = J9VMJAVALANGINVOKEVARARGSCOLLECTORHANDLE_NEXT(_currentThread, methodHandle);
((j9object_t *)_currentThread->sp)[slotCount] = methodHandle;
break;
}
case J9_METHOD_HANDLE_KIND_STATIC: {
methodHandle = initializeClassIfNeeded(methodHandle);
/* fall through */
}
case J9_METHOD_HANDLE_KIND_SPECIAL: {
j9object_t type = getMethodHandleMethodType(methodHandle);
U_32 slotCount = getMethodTypeArgSlots(type);
shiftStackedArguments(slotCount);
if (J9_METHOD_HANDLE_KIND_SPECIAL == kind) {
if (NULL == ((j9object_t*)_currentThread->sp)[slotCount]) {
nextAction = THROW_NPE;
goto done;
}
}
_currentThread->sp += 1;
method = (J9Method *)getVMSlot(methodHandle);
goto runMethod;
}
case J9_METHOD_HANDLE_KIND_VIRTUAL: {
j9object_t type = getMethodHandleMethodType(methodHandle);
U_32 slotCount = getMethodTypeArgSlots(type);
shiftStackedArguments(slotCount);
j9object_t receiver = ((j9object_t*)_currentThread->sp)[slotCount];
if (NULL != receiver) {
_currentThread->sp += 1;
J9Class *clazz = J9OBJECT_CLAZZ(_currentThread, receiver);
method = *(J9Method **)((UDATA)clazz + getVMSlot(methodHandle));
goto runMethod;
}
nextAction = THROW_NPE;
goto done;
}
case J9_METHOD_HANDLE_KIND_INTERFACE: {
j9object_t type = getMethodHandleMethodType(methodHandle);
U_32 slotCount = getMethodTypeArgSlots(type);
shiftStackedArguments(slotCount);
j9object_t receiver = ((j9object_t*)_currentThread->sp)[slotCount];
if (NULL != receiver) {
_currentThread->sp += 1;
J9Class *receiverClazz = J9OBJECT_CLAZZ(_currentThread, receiver);
J9Class *interfaceClazz = J9VM_J9CLASS_FROM_HEAPCLASS(_currentThread, J9VMJAVALANGINVOKEPRIMITIVEHANDLE_REFERENCECLASS(_currentThread, methodHandle));
method = convertITableIndexToVirtualMethod(receiverClazz, interfaceClazz, getVMSlot(methodHandle));
if (NULL != method) {
goto runMethod;
}
prepareForExceptionThrow(_currentThread);
setCurrentExceptionUTF(_currentThread, J9VMCONSTANTPOOL_JAVALANGINCOMPATIBLECLASSCHANGEERROR, NULL);
goto throwCurrentException;
}
nextAction = THROW_NPE;
goto done;
}
#ifdef J9VM_OPT_PANAMA
case J9_METHOD_HANDLE_KIND_NATIVE: {
runNativeMethodHandle(methodHandle);
goto done;
}
#endif /* J9VM_OPT_PANAMA */
case J9_METHOD_HANDLE_KIND_BOUND: {
j9object_t type = getMethodHandleMethodType(methodHandle);
U_32 slotCount = getMethodTypeArgSlots(type);
j9object_t receiver = J9VMJAVALANGINVOKERECEIVERBOUNDHANDLE_RECEIVER(_currentThread, methodHandle);
U_32 modifiers = getPrimitiveHandleModifiers(methodHandle);
method = (J9Method*)getVMSlot(methodHandle);
if (J9AccStatic != (modifiers & J9AccStatic)) {
if (NULL == receiver) {
nextAction = THROW_NPE;
goto done;
}
}
((j9object_t*)_currentThread->sp)[slotCount] = receiver;
goto runMethod;
}
case J9_METHOD_HANDLE_KIND_DYNAMIC_INVOKER: {
j9object_t type = getMethodHandleMethodType(methodHandle);
U_32 slotCount = getMethodTypeArgSlots(type);
j9object_t callsite = J9VMJAVALANGINVOKEDYNAMICINVOKERHANDLE_SITE(_currentThread, methodHandle);
if (isVolatileCallsite(callsite)) {
methodHandle = J9VMJAVALANGINVOKEVOLATILECALLSITE_TARGET(_currentThread, callsite);
VM_AtomicSupport::readBarrier();
} else {
methodHandle = J9VMJAVALANGINVOKEMUTABLECALLSITE_TARGET(_currentThread, callsite);
/* MutableCallSite.target is currently volatile - therefore readbarrier required */
VM_AtomicSupport::readBarrier();
}
((j9object_t*)_currentThread->sp)[slotCount] = methodHandle;
break;
}
case J9_METHOD_HANDLE_KIND_INVOKE_EXACT: {
j9object_t type = getMethodHandleMethodType(methodHandle);
U_32 slotCount = getMethodTypeArgSlots(type);
shiftStackedArguments(slotCount);
j9object_t receiver = ((j9object_t*)_currentThread->sp)[slotCount];
_currentThread->sp += 1;
if (NULL != receiver) {
j9object_t nextType = J9VMJAVALANGINVOKEINVOKEEXACTHANDLE_NEXTTYPE(_currentThread, methodHandle);
j9object_t receiverType = getMethodHandleMethodType(receiver);
if (receiverType == nextType) {
methodHandle = receiver;
break;
}
nextAction = THROW_WRONG_METHOD_TYPE;
} else {
/* receiver == null */
nextAction = THROW_NPE;
}
goto done;
}
case J9_METHOD_HANDLE_KIND_INVOKE_GENERIC: {
methodHandle = doInvokeGeneric(methodHandle);
if (VM_VMHelpers::exceptionPending(_currentThread)) {
goto throwCurrentException;
} else if (NULL == methodHandle) {
nextAction = THROW_NPE;
goto done;
}
break;
}
case J9_METHOD_HANDLE_KIND_FILTER_RETURN: {
j9object_t type = getMethodHandleMethodType(methodHandle);
U_32 slotCount = getMethodTypeArgSlots(type);
j9object_t returnFilter = J9VMJAVALANGINVOKEFILTERRETURNHANDLE_FILTER(_currentThread, methodHandle);
insertPlaceHolderFrame(slotCount, returnFilter, J9VMJAVALANGINVOKEMETHODHANDLE_RETURNFILTERPLACEHOLDER_METHOD(_vm));
methodHandle = J9VMJAVALANGINVOKECONVERTHANDLE_NEXT(_currentThread, methodHandle);
((j9object_t *)_currentThread->sp)[slotCount] = methodHandle;
break;
}
case J9_METHOD_HANDLE_KIND_FOLD_HANDLE: {
methodHandle = foldForFoldArguments(methodHandle);
if (VM_VMHelpers::exceptionPending(_currentThread)) {
goto throwCurrentException;
}
break;
}
case J9_METHOD_HANDLE_KIND_FILTER_ARGUMENTS_WITH_COMBINER: {
methodHandle = filterArgumentsWithCombiner(methodHandle);
if (VM_VMHelpers::exceptionPending(_currentThread)) {
goto throwCurrentException;
}
break;
}
case J9_METHOD_HANDLE_KIND_GUARD_WITH_TEST: {
/* Get GWT_Handle.type and GWT_Handle.type.argSlots (GWT - GuardWithTest) */
/* [... GWT_Handle args] */
j9object_t guardType = getMethodHandleMethodType(methodHandle);
U_32 guardArgSlots = getMethodTypeArgSlots(guardType);
/* [... GWT_Handle args descriptionBytes MethodTypeFrame] */
UDATA *spPriorToFrameBuild = _currentThread->sp;
(void)buildMethodTypeFrame(_currentThread, guardType);
/* [... GWT_Handle args descriptionBytes MethodTypeFrame GWT_Handle args] */
_currentThread->sp -= (guardArgSlots + 1);
memcpy(_currentThread->sp, spPriorToFrameBuild, sizeof(UDATA) * (guardArgSlots+1));
/* [... GWT_Handle args descriptionBytes MethodTypeFrame GWT_Handle PlaceHolderFrame GWT_Handle args] */
insertPlaceHolderFrame(guardArgSlots, methodHandle, J9VMJAVALANGINVOKEMETHODHANDLE_GUARDWITHTESTPLACEHOLDER_METHOD(_vm));
/* Get GWT_Handle.guard (testHandle), testHandle.type and testHandle.type.argSlots */
methodHandle = J9VMJAVALANGINVOKEGUARDWITHTESTHANDLE_GUARD(_currentThread, methodHandle);
j9object_t testType = getMethodHandleMethodType(methodHandle);
U_32 testArgSlots = getMethodTypeArgSlots(testType);
/* Replace GWT_Handle with testHandle and adjust sp according to testHandle.type.argSlots */
/* [... GWT_Handle args descriptionBytes MethodTypeFrame GWT_Handle PlaceHolderFrame testHandle args] */
((j9object_t *)_currentThread->sp)[guardArgSlots] = methodHandle;
_currentThread->sp += (guardArgSlots - testArgSlots);
break;
}
case J9_METHOD_HANDLE_KIND_FILTER_ARGUMENTS: {
/* Get FAH.type and FAH.type.argSlots [FAH (parent) - FilterArgumentsHandle] */
/* [... FAH args] */
j9object_t parentHandle = methodHandle;
j9object_t parentType = getMethodHandleMethodType(methodHandle);
j9object_t filters = J9VMJAVALANGINVOKEFILTERARGUMENTSHANDLE_FILTERS(_currentThread, methodHandle);
U_32 filtersLength = J9INDEXABLEOBJECT_SIZE(_currentThread, filters);
U_32 startPosition = (U_32) J9VMJAVALANGINVOKEFILTERARGUMENTSHANDLE_STARTPOS(_currentThread, methodHandle);
methodHandle = J9VMJAVALANGINVOKEFILTERARGUMENTSHANDLE_NEXT(_currentThread, methodHandle);
j9object_t nextType = getMethodHandleMethodType(methodHandle);
U_32 nextArgSlots = getMethodTypeArgSlots(nextType);
/* Check if there are filters to be applied */
Assert_VM_true(filtersLength > 0);
/* [... FAH args MTFrame] (MTFrame - descriptionBytes + MethodTypeFrame) */
(void)buildMethodTypeFrame(_currentThread, parentType);
/* [... FAH args MTFrame FAH.next UpdatedArgs] */
UDATA *nextPtr = _currentThread->sp - 1; /* Store pointer to FAH.next */
_currentThread->sp -= (nextArgSlots + 1);
((j9object_t *)_currentThread->sp)[nextArgSlots] = methodHandle;
memset(_currentThread->sp, 0, nextArgSlots * sizeof(UDATA *));
/* [... FAH args MTFrame FAH.next UpdatedArgs MTFrame] */
J9SFMethodTypeFrame *frameNext = buildMethodTypeFrame(_currentThread, nextType);
/* [... FAH args MTFrame FAH.next UpdatedArgs MTFrame FAH index parentOffset nextOffset PlaceHolderFrame FAH] */
_currentThread->sp -= 1;
insertFourArgumentPlaceHolderFrame(0, parentHandle, 0, 0, 0, J9VMJAVALANGINVOKEMETHODHANDLE_FILTERARGUMENTSPLACEHOLDER_METHOD(_vm));
/* Accessing FAH.type.arguments[] and its attributes for future operations */
j9object_t parentTypeArguments = J9VMJAVALANGINVOKEMETHODTYPE_ARGUMENTS(_currentThread, parentType);
UDATA *parentPtr = UNTAGGED_A0(frameNext); /* Store pointer to parent */
/* Copy identical args between parent and next */
J9Class *currentClass = NULL;
U_32 offset = 0;
for (U_32 i = 0; i < startPosition; i++) {
currentClass = J9VM_J9CLASS_FROM_HEAPCLASS(_currentThread, J9JAVAARRAYOFOBJECT_LOAD(_currentThread, parentTypeArguments, i));
*--nextPtr = *--parentPtr;
offset += 1;
if ((_vm->doubleReflectClass == currentClass) || (_vm->longReflectClass == currentClass)) {
*--nextPtr = *--parentPtr;
offset += 1;
}
}
UDATA *offsetPtr = _currentThread->arg0EA - 2; /* Pointer to parentOffset */
*(U_32 *)(offsetPtr - 1) = offset; /* Update nextOffset */
/* [... FAH args MTFrame FAH.next UpdatedArgs MTFrame FAH index parentOffset nextOffset PlaceHolderFrame FAH.filters[0] arg] */
J9Class *startClass = J9VM_J9CLASS_FROM_HEAPCLASS(_currentThread, J9JAVAARRAYOFOBJECT_LOAD(_currentThread, parentTypeArguments, startPosition));
methodHandle = J9JAVAARRAYOFOBJECT_LOAD(_currentThread, filters, 0);
*(j9object_t *)_currentThread->sp = methodHandle;
*--(_currentThread->sp) = *--parentPtr;
offset += 1;
if ((_vm->doubleReflectClass == startClass) || (_vm->longReflectClass == startClass)) {
*--(_currentThread->sp) = *--parentPtr;
offset += 1;
}
*(U_32 *) offsetPtr = offset; /* Update parentOffset */
break;
}
case J9_METHOD_HANDLE_KIND_CONSTRUCTOR: {
methodHandle = initializeClassIfNeeded(methodHandle);
j9object_t type = getMethodHandleMethodType(methodHandle);
U_32 slotCount = getMethodTypeArgSlots(type);
J9Class *allocateClass = J9VM_J9CLASS_FROM_HEAPCLASS(
_currentThread,
J9VMJAVALANGINVOKEPRIMITIVEHANDLE_REFERENCECLASS(_currentThread, methodHandle));
method = (J9Method*)getVMSlot(methodHandle);
j9object_t newObject = _objectAllocate->inlineAllocateObject(_currentThread, allocateClass);
if (NULL == newObject) {
UDATA *spPriorToFrameBuild = _currentThread->sp;
J9SFMethodTypeFrame * frame = buildMethodTypeFrame(_currentThread, type);
newObject = _vm->memoryManagerFunctions->J9AllocateObject(
_currentThread,
allocateClass,
J9_GC_ALLOCATE_OBJECT_NON_INSTRUMENTABLE);
if (NULL == newObject) {
goto throwHeapOOM;
}
restoreMethodTypeFrame(frame, spPriorToFrameBuild);
}
insertPlaceHolderFrame(slotCount, newObject, J9VMJAVALANGINVOKEMETHODHANDLE_CONSTRUCTORPLACEHOLDER_METHOD(_vm));
goto runMethod;
}
case J9_METHOD_HANDLE_KIND_GET_FIELD: {
UDATA const objectHeaderSize = J9VMTHREAD_OBJECT_HEADER_SIZE(_currentThread);
j9object_t type = getMethodHandleMethodType(methodHandle);
UDATA fieldOffset = getVMSlot(methodHandle);
J9Class *fieldClass = getMethodTypeReturnClass(type);
U_32 modifiers = getPrimitiveHandleModifiers(methodHandle);
j9object_t object = *(j9object_t *)_currentThread->sp;
_currentThread->sp += 1;
if (NULL == object) {
nextAction = THROW_NPE;
goto done;
}
bool isVolatile = (J9AccVolatile == (modifiers & J9AccVolatile));
fieldOffset += objectHeaderSize;
if (J9ROMCLASS_IS_PRIMITIVE_TYPE(fieldClass->romClass)) {
if (8 == ((J9ROMReflectClass *)(fieldClass->romClass))->elementSize) {
_currentThread->sp -= 1;
*(U_64*)_currentThread->sp =
_objectAccessBarrier->inlineMixedObjectReadU64(_currentThread, object, fieldOffset, isVolatile);
} else {
*(U_32*)_currentThread->sp =
_objectAccessBarrier->inlineMixedObjectReadU32(_currentThread, object, fieldOffset, isVolatile);
}
} else {
*(j9object_t*)_currentThread->sp =
_objectAccessBarrier->inlineMixedObjectReadObject(_currentThread, object, fieldOffset, isVolatile);
}
goto returnFromSend;
}
case J9_METHOD_HANDLE_KIND_PUT_FIELD: {
UDATA const objectHeaderSize = J9VMTHREAD_OBJECT_HEADER_SIZE(_currentThread);
j9object_t type = getMethodHandleMethodType(methodHandle);
UDATA fieldOffset = getVMSlot(methodHandle);
/* Loading index 1 because MethodType has form: (instanceClass, fieldClass)V */
j9object_t fieldClassObject =
_objectAccessBarrier->inlineIndexableObjectReadObject(_currentThread, getMethodTypeArguments(type), 1);
J9Class *fieldClass = J9VM_J9CLASS_FROM_HEAPCLASS(_currentThread, fieldClassObject);
U_32 modifiers = getPrimitiveHandleModifiers(methodHandle);
fieldOffset += objectHeaderSize;
bool isVolatile = (J9AccVolatile == (modifiers & J9AccVolatile));
if (J9ROMCLASS_IS_PRIMITIVE_TYPE(fieldClass->romClass)) {
if (8 == ((J9ROMReflectClass *)(fieldClass->romClass))->elementSize) {
j9object_t objectref = *(j9object_t*)(_currentThread->sp + 2);
if (NULL == objectref) {
nextAction = THROW_NPE;
goto done;
}
_objectAccessBarrier->inlineMixedObjectStoreU64(_currentThread, objectref, fieldOffset, *(U_64*)_currentThread->sp, isVolatile);
_currentThread->sp += 3;
} else {
j9object_t objectref = *(j9object_t*)(_currentThread->sp + 1);
if (NULL == objectref) {
nextAction = THROW_NPE;
goto done;
}
_objectAccessBarrier->inlineMixedObjectStoreU32(_currentThread, objectref, fieldOffset, *(U_32*)_currentThread->sp, isVolatile);
_currentThread->sp += 2;
}
} else {
j9object_t objectref = *(j9object_t*)(_currentThread->sp + 1);
if (NULL == objectref) {
nextAction = THROW_NPE;
goto done;
}
_objectAccessBarrier->inlineMixedObjectStoreObject(_currentThread, objectref, fieldOffset, *(j9object_t*)_currentThread->sp, isVolatile);
_currentThread->sp += 2;
}
_currentThread->sp += 1; /* remove MethodHandle */
goto returnFromSend;
}
case J9_METHOD_HANDLE_KIND_GET_STATIC_FIELD: {
methodHandle = initializeClassIfNeeded(methodHandle);
J9Class* defc = getPrimitiveHandleDefc(methodHandle);
UDATA srcAddress = getVMSlot(methodHandle);
srcAddress &= ~J9_SUN_FIELD_OFFSET_MASK;
srcAddress += (UDATA)defc->ramStatics;
U_32 modifiers = getPrimitiveHandleModifiers(methodHandle);
j9object_t type = getMethodHandleMethodType(methodHandle);
J9Class *fieldClass = getMethodTypeReturnClass(type);
bool isVolatile = (J9StaticFieldRefVolatile == (modifiers & J9StaticFieldRefVolatile));
{
if (J9ROMCLASS_IS_PRIMITIVE_TYPE(fieldClass->romClass)) {
if (8 == ((J9ROMReflectClass *)(fieldClass->romClass))->elementSize) {
_currentThread->sp -=1;
*(U_64*)_currentThread->sp =
_objectAccessBarrier->inlineStaticReadU64(_currentThread, defc, (U_64 *)srcAddress, isVolatile);
} else {
*(U_32*)_currentThread->sp =
_objectAccessBarrier->inlineStaticReadU32(_currentThread, defc, (U_32*)srcAddress, isVolatile);
}
} else {
*(j9object_t*)_currentThread->sp =
_objectAccessBarrier->inlineStaticReadObject(_currentThread, defc, (j9object_t*)srcAddress, isVolatile);
}
}
goto returnFromSend;
}
case J9_METHOD_HANDLE_KIND_PUT_STATIC_FIELD: {
methodHandle = initializeClassIfNeeded(methodHandle);
j9object_t type = getMethodHandleMethodType(methodHandle);
J9Class* defc = getPrimitiveHandleDefc(methodHandle);
UDATA srcAddress = getVMSlot(methodHandle);
srcAddress &= ~J9_SUN_FIELD_OFFSET_MASK;
srcAddress += (UDATA)defc->ramStatics;
j9object_t fieldClassObject =
J9JAVAARRAYOFOBJECT_LOAD(_currentThread, getMethodTypeArguments(type), 0);
J9Class *fieldClass = J9VM_J9CLASS_FROM_HEAPCLASS(_currentThread, fieldClassObject);
U_32 modifiers = getPrimitiveHandleModifiers(methodHandle);
bool isVolatile = (J9StaticFieldRefVolatile == (modifiers & J9StaticFieldRefVolatile));
{
if (J9ROMCLASS_IS_PRIMITIVE_TYPE(fieldClass->romClass)) {
if (8 == ((J9ROMReflectClass *)(fieldClass->romClass))->elementSize) {
_objectAccessBarrier->inlineStaticStoreU64(_currentThread, defc, (U_64*)srcAddress, *(U_64*)_currentThread->sp, isVolatile);
_currentThread->sp += 3;
} else {
_objectAccessBarrier->inlineStaticStoreU32(_currentThread, defc, (U_32*)srcAddress, *(U_32*)_currentThread->sp, isVolatile);
_currentThread->sp += 2;
}
} else {
_objectAccessBarrier->inlineStaticStoreObject(_currentThread, defc, (j9object_t*)srcAddress, *(j9object_t*)_currentThread->sp, isVolatile);
_currentThread->sp += 2;
}
}
goto returnFromSend;
}
case J9_METHOD_HANDLE_KIND_COLLECT: {
BOOLEAN foundHeapOOM = FALSE;
methodHandle = collectForAsCollector(methodHandle, &foundHeapOOM);
if (foundHeapOOM) {
goto throwHeapOOM;
}
break;
}
case J9_METHOD_HANDLE_KIND_VARHANDLE_INVOKE_EXACT:
/* fallthrough */
case J9_METHOD_HANDLE_KIND_VARHANDLE_INVOKE_GENERIC: {
j9object_t type = getMethodHandleMethodType(methodHandle);
U_32 slotCount = getMethodTypeArgSlots(type);
j9object_t varHandle = ((j9object_t*)_currentThread->sp)[slotCount - 1];
if (NULL == varHandle) {
nextAction = THROW_NPE;
goto done;
}
I_32 operation = J9VMJAVALANGINVOKEVARHANDLEINVOKEHANDLE_OPERATION(_currentThread, methodHandle);
/* Get MethodHandle for this operation from the VarHandle's handleTable */
j9object_t handleTable = J9VMJAVALANGINVOKEVARHANDLE_HANDLETABLE(_currentThread, varHandle);
j9object_t methodHandleFromTable = J9JAVAARRAYOFOBJECT_LOAD(_currentThread, handleTable, operation);
if (NULL == methodHandleFromTable) {
/* Building a method type (MT) frame makes the stack walkable since looking up the class below may
* cause a GC or another exception. Also, the MT frame will make it easier to debug and service the
* error as the VarHandle will be on the stack and findable with DDR. The MT frame does not need to
* be restored since throwing the exception will handle it appropriately.
*/
buildMethodTypeFrame(_currentThread, type);
prepareExceptionUsingClassName(_currentThread, "java/lang/UnsupportedOperationException");
goto throwCurrentException;
}
j9object_t handleTypeFromTable = J9VMJAVALANGINVOKEMETHODHANDLE_TYPE(_currentThread, methodHandleFromTable);
j9object_t accessModeType = J9VMJAVALANGINVOKEVARHANDLEINVOKEHANDLE_ACCESSMODETYPE(_currentThread, methodHandle);
if (accessModeType == handleTypeFromTable) {
methodHandle = methodHandleFromTable;
} else if (J9_METHOD_HANDLE_KIND_VARHANDLE_INVOKE_GENERIC == kind) {
UDATA * spPriorToFrameBuild = _currentThread->sp;
/* We need to do a callin to get an asType handle */
J9SFMethodTypeFrame* currentTypeFrame = buildMethodTypeFrame(_currentThread, type);
/* Convert absolute values to A0 relative offsets */
IDATA spOffset = spPriorToFrameBuild - _currentThread->arg0EA;
IDATA frameOffset = (UDATA*)currentTypeFrame - _currentThread->arg0EA;
sendForGenericInvoke(_currentThread, methodHandleFromTable, accessModeType, FALSE /* dropFirstArg */);
methodHandle = (j9object_t)_currentThread->returnValue;
if (VM_VMHelpers::exceptionPending(_currentThread)) {
goto throwCurrentException;
}
/* Convert A0 relative offsets to absolute values */
spPriorToFrameBuild = _currentThread->arg0EA + spOffset;
currentTypeFrame = (J9SFMethodTypeFrame*)(_currentThread->arg0EA + frameOffset);
/* Pop the frame */
_currentThread->literals = currentTypeFrame->savedCP;
_currentThread->pc = currentTypeFrame->savedPC;
_currentThread->arg0EA = UNTAGGED_A0(currentTypeFrame);
_currentThread->sp = spPriorToFrameBuild;
} else {
nextAction = THROW_WRONG_METHOD_TYPE;
goto done;
}
/* Get VarHandle again in case GC moved it */
varHandle = ((j9object_t*)_currentThread->sp)[slotCount - 1];
/* Remove old handle from stack */
shiftStackedArguments(slotCount);
/* Put VarHandle as last argument */
*(j9object_t*)_currentThread->sp = varHandle;
/* Interpret access mode handle */
((j9object_t*)_currentThread->sp)[slotCount] = methodHandle;
break;
}
default:
Assert_VM_unreachable();
break;
}
void * compiledEntryPoint = VM_VMHelpers::methodHandleCompiledEntryPoint(_vm, _currentThread, methodHandle);
if (NULL != compiledEntryPoint) {
_currentThread->tempSlot = (UDATA)methodHandle;
_currentThread->floatTemp1 = compiledEntryPoint;
nextAction = GOTO_RUN_METHODHANDLE_COMPILED;
#if defined(MH_TRACE)
printf("#(%p)# dispatchLoop run MH %p compiled. Entrypoint = %p\n", _currentThread, methodHandle, compiledEntryPoint);
#endif
goto done;
}
}
runMethod: {
#if defined(MH_TRACE)
printf("#(%p)# dispatchLoop run method=%p\n", _currentThread, method);
#endif
_currentThread->tempSlot = (UDATA)method;
nextAction = GOTO_RUN_METHOD_FROM_METHOD_HANDLE;
goto done;
}
returnFromSend: {
nextAction = returnFromSend();
goto done;
}
throwCurrentException: {
#if defined(MH_TRACE)
printf("#(%p)# dispatchLoop throw current exception %p\n", _currentThread, _currentThread->currentException);
#endif
nextAction = GOTO_THROW_CURRENT_EXCEPTION;
goto done;
}
throwHeapOOM: {
#if defined(MH_TRACE)
printf("#(%p)# dispatchLoop throw heap OOM\n", _currentThread);
#endif
nextAction = THROW_HEAP_OOM;
goto done;
}
done:
#if defined(MH_TRACE)
printf("#(%p)# dispatchLoop done - nextAction=%d\n", _currentThread, (I_32)nextAction);
#endif
return nextAction;
}
VM_BytecodeAction
VM_MHInterpreter::impdep1()
{
VM_BytecodeAction rc = EXECUTE_BYTECODE;
/* NOTE: bp calculation assumes that there is only ever a single argument on the stack */
UDATA *bp = _currentThread->arg0EA - (sizeof(J9SFStackFrame)/sizeof(UDATA*));
J9SFStackFrame *frame = (J9SFStackFrame*)(bp);
if (J9VMJAVALANGINVOKEMETHODHANDLE_CONSTRUCTORPLACEHOLDER_METHOD(_vm) == _currentThread->literals) {
/* restore frame for constructor: leave objectRef on stack & increment PC */
_currentThread->sp = _currentThread->arg0EA;
_currentThread->literals = frame->savedCP;
_currentThread->pc = frame->savedPC + 3;
_currentThread->arg0EA = UNTAGGED_A0(frame);
} else if (J9VMJAVALANGINVOKEMETHODHANDLE_RETURNFILTERPLACEHOLDER_METHOD(_vm) == _currentThread->literals) {
rc = GOTO_RUN_METHODHANDLE;
/* Get the filterHandle.type.arguments[0] to determine the kind of value on the stack */
j9object_t filterHandle = *(j9object_t*)_currentThread->arg0EA;
j9object_t filterType = J9VMJAVALANGINVOKEMETHODHANDLE_TYPE(_currentThread, filterHandle);
j9object_t argTypes = J9VMJAVALANGINVOKEMETHODTYPE_ARGUMENTS(_currentThread, filterType);
UDATA returnSlots = J9INDEXABLEOBJECT_SIZE(_currentThread, argTypes);
/* Determine how many slots to pop off the stack */
UDATA returnValue0 = 0;
UDATA returnValue1 = 0;
if (0 != returnSlots) {
j9object_t returnClass = _objectAccessBarrier->inlineIndexableObjectReadObject(_currentThread, argTypes, 0);
J9Class *argTypeClass = J9VM_J9CLASS_FROM_HEAPCLASS(_currentThread, returnClass);
returnSlots = 1;
returnValue0 = _currentThread->sp[0];
if ((_vm->doubleReflectClass == argTypeClass) || (_vm->longReflectClass == argTypeClass)) {
returnSlots = 2;
returnValue1 = _currentThread->sp[1];
}
}
_currentThread->sp = _currentThread->arg0EA - returnSlots;
_currentThread->literals = frame->savedCP;
_currentThread->pc = frame->savedPC;
_currentThread->arg0EA = UNTAGGED_A0(frame);
if (0 != returnSlots) {
_currentThread->sp[0] = returnValue0;
if (2 == returnSlots) {
_currentThread->sp[1] = returnValue1;
}
}
_currentThread->tempSlot = (UDATA) filterHandle;
} else if (J9VMJAVALANGINVOKEMETHODHANDLE_FILTERARGUMENTSWITHCOMBINERPLACEHOLDER_METHOD(_vm) == _currentThread->literals) {
rc = GOTO_RUN_METHODHANDLE;
_currentThread->tempSlot = (UDATA) replaceReturnValueForFilterArgumentsWithCombiner();
} else if (J9VMJAVALANGINVOKEMETHODHANDLE_FOLDHANDLEPLACEHOLDER_METHOD(_vm) == _currentThread->literals) {
rc = GOTO_RUN_METHODHANDLE;
_currentThread->tempSlot = (UDATA) insertReturnValueForFoldArguments();
} else if (J9VMJAVALANGINVOKEMETHODHANDLE_GUARDWITHTESTPLACEHOLDER_METHOD(_vm) == _currentThread->literals) {
rc = GOTO_RUN_METHODHANDLE;
/* [... GWT_Handle args descriptionBytes MethodTypeFrame args GWT_Handle PlaceHolderFrame testHandleReturnValue] */
j9object_t guardHandle = *(j9object_t*)_currentThread->arg0EA;
j9object_t guardType = J9VMJAVALANGINVOKEMETHODHANDLE_TYPE(_currentThread, guardHandle);
U_32 guardArgSlots = (U_32)J9VMJAVALANGINVOKEMETHODTYPE_ARGSLOTS(_currentThread, guardType);
/* Locally store the boolean return value from the testHandle */
I_32 testReturnValue = *(I_32*)_currentThread->sp;
/* Set local variables to restore state of the _currentThread during updateVMStruct */
UDATA *mhPtr = UNTAGGED_A0(frame);
bp = (UDATA *)(((J9SFStackFrame*)(bp+1)) + 1);
J9SFMethodTypeFrame *mtFrame = (J9SFMethodTypeFrame*)(bp);
_currentThread->literals = mtFrame->savedCP;
_currentThread->pc = mtFrame->savedPC;
_currentThread->arg0EA = UNTAGGED_A0(mtFrame);
_currentThread->sp = mhPtr - guardArgSlots;
/* Overwrite initial GWT_Handle with either GWT_Handle.trueTarget or GWT_Handle.falseTarget based upon testHandleReturnValue */
j9object_t nextHandle = NULL;
if (0 == testReturnValue) {
nextHandle = J9VMJAVALANGINVOKEGUARDWITHTESTHANDLE_FALSETARGET(_currentThread, guardHandle);
} else {
nextHandle = J9VMJAVALANGINVOKEGUARDWITHTESTHANDLE_TRUETARGET(_currentThread, guardHandle);
}
*(j9object_t*)(mhPtr) = nextHandle;
_currentThread->tempSlot = (UDATA) nextHandle;
} else if (J9VMJAVALANGINVOKEMETHODHANDLE_FILTERARGUMENTSPLACEHOLDER_METHOD(_vm) == _currentThread->literals) {
rc = GOTO_RUN_METHODHANDLE;
/* [... FAH[1] args MTFrame FAH.next UpdatedArgs MTFrame FAH[2] index parentOffset nextOffset PlaceHolderFrame filterReturnValue] */
j9object_t parentHandle = *(j9object_t *)_currentThread->arg0EA;
j9object_t parentType = J9VMJAVALANGINVOKEMETHODHANDLE_TYPE(_currentThread, parentHandle);
j9object_t parentTypeArguments = J9VMJAVALANGINVOKEMETHODTYPE_ARGUMENTS(_currentThread, parentType);
j9object_t filters = J9VMJAVALANGINVOKEFILTERARGUMENTSHANDLE_FILTERS(_currentThread, parentHandle);
U_32 filtersLength = J9INDEXABLEOBJECT_SIZE(_currentThread, filters);
U_32 startPosition = (U_32) J9VMJAVALANGINVOKEFILTERARGUMENTSHANDLE_STARTPOS(_currentThread, parentHandle);
j9object_t nextHandle = J9VMJAVALANGINVOKEFILTERARGUMENTSHANDLE_NEXT(_currentThread, parentHandle);
j9object_t nextType = J9VMJAVALANGINVOKEMETHODHANDLE_TYPE(_currentThread, nextHandle);
U_32 nextArgSlots = (U_32)J9VMJAVALANGINVOKEMETHODTYPE_ARGSLOTS(_currentThread, nextType);
j9object_t nextTypeArguments = J9VMJAVALANGINVOKEMETHODTYPE_ARGUMENTS(_currentThread, nextType);
U_32 *index = (U_32 *)(_currentThread->arg0EA - 1);
U_32 *parentOffset = (U_32 *)(_currentThread->arg0EA - 2);
U_32 *nextOffset = (U_32 *)(_currentThread->arg0EA - 3);
frame = ((J9SFStackFrame*)(_currentThread->arg0EA - 3)) - 1; /* Recalculate frame location while taking into account 4 placeHolderMethod arguments */
J9SFMethodTypeFrame *mtNextFrame = (J9SFMethodTypeFrame*)(_currentThread->arg0EA + 1);
UDATA *parentPtr = UNTAGGED_A0(mtNextFrame); /* Pointer to FAH[1] */
UDATA *nextPtr = UNTAGGED_A0(frame); /* Pointer to FAH.next */
/* Update FAH.next arguments using filterReturnValue */
J9Class *returnClass = J9VM_J9CLASS_FROM_HEAPCLASS(_currentThread, J9JAVAARRAYOFOBJECT_LOAD(_currentThread, nextTypeArguments, (startPosition + *index)));
U_32 returnArgSlots = 0;
if (_vm->voidReflectClass != returnClass) {
returnArgSlots += 1;
if ((_vm->doubleReflectClass == returnClass) || (_vm->longReflectClass == returnClass)) {
returnArgSlots += 1;
}
}
parentPtr -= *parentOffset;
*nextOffset += returnArgSlots;
nextPtr -= *nextOffset;
memmove(nextPtr, _currentThread->sp, returnArgSlots * sizeof(UDATA *));
_currentThread->sp += returnArgSlots;
/* Get the next non-null filterMH while treating intermediate null filterMHs as identity functions */
j9object_t currentFilterHandle = NULL;
J9Class *currentParentClass = NULL;
U_32 offset = 0;
U_32 i = (*index + 1);
for (; i < filtersLength; i++) {
currentFilterHandle = J9JAVAARRAYOFOBJECT_LOAD(_currentThread, filters, i);
currentParentClass = J9VM_J9CLASS_FROM_HEAPCLASS(_currentThread, J9JAVAARRAYOFOBJECT_LOAD(_currentThread, parentTypeArguments, (startPosition + i)));
if (NULL == currentFilterHandle) {
if (_vm->voidReflectClass != currentParentClass) {
*--nextPtr = *--parentPtr;
offset += 1;
if ((_vm->doubleReflectClass == currentParentClass) || (_vm->longReflectClass == currentParentClass)) {
*--nextPtr = *--parentPtr;
offset += 1;
}
}
} else {
break;
}
}
*parentOffset += offset;
*nextOffset += offset;
*index = i;
if (filtersLength == *index) { /* All filterMHs have been processed */
/* Copy trailing parent args into next args */
for (U_32 i = (*nextOffset + 1); i <= nextArgSlots; i++) {
*--nextPtr = *--parentPtr;
}
UDATA *srcPtr = UNTAGGED_A0(frame); /* Pointer to FAH.next */
UDATA *destPtr = UNTAGGED_A0(mtNextFrame); /* Pointer to FAH[1] */
/* Restore initial thread state */
J9SFMethodTypeFrame *mtParentFrame = (J9SFMethodTypeFrame *)(srcPtr + 1);
_currentThread->literals = mtParentFrame->savedCP;
_currentThread->pc = mtParentFrame->savedPC;
_currentThread->arg0EA = UNTAGGED_A0(mtParentFrame);
_currentThread->sp = destPtr - nextArgSlots;
/* [... FAH.next UpdatedArgs] */
memmove(destPtr - nextArgSlots, srcPtr - nextArgSlots, (nextArgSlots + 1) * sizeof(UDATA *));
_currentThread->tempSlot = (UDATA) nextHandle;
} else { /* Prepare next non-null filterMH for processing */
_currentThread->sp -= 1;
*(j9object_t *)(_currentThread->sp) = currentFilterHandle;
_currentThread->tempSlot = (UDATA) currentFilterHandle;
U_32 nextFilterArgumentSlots = 0;
if (_vm->voidReflectClass != currentParentClass) {
nextFilterArgumentSlots += 1;
if ((_vm->doubleReflectClass == currentParentClass) || (_vm->longReflectClass == currentParentClass)) {
nextFilterArgumentSlots += 1;
}
}
*parentOffset += nextFilterArgumentSlots;
parentPtr -= nextFilterArgumentSlots;
_currentThread->sp -= nextFilterArgumentSlots;
memmove(_currentThread->sp, parentPtr, nextFilterArgumentSlots * sizeof(UDATA *));
_currentThread->pc -= 3; /* Point to impdep1 */
}
} else {
Assert_VM_unreachable();
}
return rc;
}
j9object_t
VM_MHInterpreter::convertArgumentsForAsType(j9object_t methodHandle)
{
j9object_t result = NULL;
j9object_t currentType = J9VMJAVALANGINVOKEMETHODHANDLE_TYPE(_currentThread, methodHandle);
U_32 currentArgSlots = (U_32)J9VMJAVALANGINVOKEMETHODTYPE_ARGSLOTS(_currentThread, currentType);
j9object_t nextHandle = J9VMJAVALANGINVOKECONVERTHANDLE_NEXT(_currentThread, methodHandle);
j9object_t nextType = J9VMJAVALANGINVOKEMETHODHANDLE_TYPE(_currentThread, nextHandle);
U_32 nextArgSlots = (U_32)J9VMJAVALANGINVOKEMETHODTYPE_ARGSLOTS(_currentThread, nextType);
UDATA explicitCast = (J9VMJAVALANGINVOKEMETHODHANDLE_KIND(_currentThread, methodHandle) == J9_METHOD_HANDLE_KIND_EXPLICITCAST);
UDATA requiresBoxing = (UDATA)J9VMJAVALANGINVOKECONVERTHANDLE_REQUIRESBOXING(_currentThread, methodHandle);
UDATA * currentArgs = NULL;
UDATA * nextArgs = NULL;
UDATA * finalSP = NULL;
J9SFMethodTypeFrame * currentTypeFrame = NULL;
J9SFMethodTypeFrame * nextTypeFrame = NULL;
UDATA rc = 0;
ClassCastExceptionData exceptionData;
memset(&exceptionData, 0, sizeof(ClassCastExceptionData));
currentArgs = _currentThread->sp + currentArgSlots;
finalSP = currentArgs - nextArgSlots;
if (0 != requiresBoxing) {
/* Lay down a frame to describe the current args */
currentTypeFrame = buildMethodTypeFrame(_currentThread, currentType);
/* Reserve space for all of the new arguments, zero them, and drop another method type frame to describe them */
*--(_currentThread->sp) = (UDATA) nextHandle;
nextArgs = _currentThread->sp;
_currentThread->sp -= nextArgSlots;
memset(_currentThread->sp, 0, nextArgSlots * sizeof(UDATA *));
nextTypeFrame = buildMethodTypeFrame(_currentThread, nextType);
/* Convert the arguments */
rc = convertArguments(currentArgs, ¤tTypeFrame->methodType, nextArgs, &nextTypeFrame->methodType, explicitCast, &exceptionData);
if (NO_EXCEPTION != rc) {
/* In the case of a return value being non-zero, throw the exception */
goto fail;
}
/* Remove the method type frames */
_currentThread->literals = currentTypeFrame->savedCP;
_currentThread->pc = currentTypeFrame->savedPC;
_currentThread->arg0EA = UNTAGGED_A0(currentTypeFrame);
} else {
/* If we don't require boxing, do the operations on the java stack
* but don't move the sp until the operations are complete or an exception is thrown
*/
UDATA *tempSP = _currentThread->sp;
/* Reserve space for all of the new arguments, and zero them */
*--(tempSP) = (UDATA) nextHandle;
nextArgs = tempSP;
tempSP -= nextArgSlots;
memset(tempSP, 0, nextArgSlots * sizeof(UDATA *));
/* Convert the arguments */
rc = convertArguments(currentArgs, ¤tType, nextArgs, &nextType, explicitCast, &exceptionData);
if (NO_EXCEPTION != rc) {
/* In the case of a return value being non-zero, throw the exception.
* First we need to make the stack walkable by building a valid frame.
*/
buildMethodTypeFrame(_currentThread, currentType);
goto fail;
}
}
/* Move the new arguments (including the next MethodHandle) into their final position */
_currentThread->sp = finalSP;
memmove(finalSP, nextArgs - nextArgSlots, (nextArgSlots + 1) * sizeof(UDATA *));
/* Return the next handle from its new location on the stack */
result = (j9object_t) finalSP[nextArgSlots];
done:
return result;
fail:
/* In the case of a return value being non-zero, throw the exception */
if (NULL_POINTER_EXCEPTION == rc) {
setCurrentException(_currentThread, J9VMCONSTANTPOOL_JAVALANGNULLPOINTEREXCEPTION, NULL);
} else if (CLASS_CAST_EXCEPTION == rc) {
setClassCastException(_currentThread, exceptionData.currentClass, exceptionData.nextClass);
} else {
setCurrentException(_currentThread, J9VMCONSTANTPOOL_JAVALANGINTERNALERROR, NULL);
}
goto done;
}
j9object_t
VM_MHInterpreter::doInvokeGeneric(j9object_t methodHandle)
{
j9object_t castType = J9VMJAVALANGINVOKEINVOKEGENERICHANDLE_CASTTYPE(_currentThread, methodHandle);
j9object_t currentType = J9VMJAVALANGINVOKEMETHODHANDLE_TYPE(_currentThread, methodHandle);
U_32 currentArgSlots = (U_32)J9VMJAVALANGINVOKEMETHODTYPE_ARGSLOTS(_currentThread, currentType);
const U_32 slotsOffsetToTargetHandle = currentArgSlots - 1;
j9object_t targetHandle = *(j9object_t*)(_currentThread->sp + slotsOffsetToTargetHandle);
/* If receiver handle is null, return directly and a NPE will be thrown by the caller */
if (targetHandle == NULL) {
return targetHandle;
}
j9object_t targetType = J9VMJAVALANGINVOKEMETHODHANDLE_TYPE(_currentThread, targetHandle);
/* There are three cases here:
* - The target handle's type correctly matches the stack, we can directly invoke that handle
* - A previous asType result correctly matches the stack, we can overwrite the target and invoke that
* - We need to do a callin to create the correct as type, we can overwrite the target and invoke that
*/
if (targetType != castType) {
J9SFMethodTypeFrame *currentTypeFrame = NULL;
UDATA * spPriorToFrameBuild = _currentThread->sp;
j9object_t cachedHandle = J9VMJAVALANGINVOKEMETHODHANDLE_PREVIOUSASTYPE(_currentThread, targetHandle);
IDATA spOffset = 0;
IDATA frameOffset = 0;
if (cachedHandle != NULL) {
j9object_t cachedHandleType = J9VMJAVALANGINVOKEMETHODHANDLE_TYPE(_currentThread, cachedHandle);
if (cachedHandleType == castType) {
*(j9object_t*)(_currentThread->sp + slotsOffsetToTargetHandle) = cachedHandle;
targetHandle = cachedHandle;
goto done;
}
}
/* We need to do a callin to get an asType handle */
currentTypeFrame = buildMethodTypeFrame(_currentThread, currentType);
/* Convert absolute values to A0 relative offsets */
spOffset = spPriorToFrameBuild - _currentThread->arg0EA;
frameOffset = (UDATA*)currentTypeFrame - _currentThread->arg0EA;