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InterpreterEmulator.cpp
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/*******************************************************************************
* Copyright (c) 2000, 2021 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#include "optimizer/InterpreterEmulator.hpp"
#include "optimizer/J9EstimateCodeSize.hpp"
#include "env/VMAccessCriticalSection.hpp"
#include "env/JSR292Methods.h"
#include "optimizer/PreExistence.hpp"
#include "optimizer/J9CallGraph.hpp"
#include "ilgen/IlGenRequest.hpp"
#include "jilconsts.h"
#include "il/ParameterSymbol.hpp"
#include "optimizer/PreExistence.hpp"
#include "optimizer/TransformUtil.hpp"
#include "il/Node_inlines.hpp"
#if defined(J9VM_OPT_JITSERVER)
#include "control/CompilationRuntime.hpp"
#include "env/j9methodServer.hpp"
#endif /* defined(J9VM_OPT_JITSERVER) */
const char* Operand::KnowledgeStrings[] = {"NONE", "OBJECT", "MUTABLE_CALLSITE_TARGET", "PREEXISTENT", "FIXED_CLASS", "KNOWN_OBJECT", "ICONST" };
char*
ObjectOperand::getSignature(TR::Compilation *comp, TR_Memory *trMemory)
{
if (!_signature && _clazz)
_signature = TR::Compiler->cls.classSignature(comp, _clazz, trMemory);
return _signature;
}
KnownObjOperand::KnownObjOperand(TR::KnownObjectTable::Index koi, TR_OpaqueClassBlock* clazz)
: knownObjIndex(koi), FixedClassOperand(clazz)
{
TR_ASSERT_FATAL(knownObjIndex != TR::KnownObjectTable::UNKNOWN, "Unexpected unknown object");
}
TR_OpaqueClassBlock*
KnownObjOperand::getClass()
{
if (_clazz)
return _clazz;
TR::Compilation* comp = TR::comp();
auto knot = comp->getOrCreateKnownObjectTable();
if (!knot || knot->isNull(knownObjIndex))
return NULL;
_clazz = comp->fej9()->getObjectClassFromKnownObjectIndex(comp, knownObjIndex);
return _clazz;
}
ObjectOperand*
KnownObjOperand::asObjectOperand()
{
if (getClass())
return this;
return NULL;
}
// FixedClassOperand need the class, if we can't get the class, return NULL
FixedClassOperand*
KnownObjOperand::asFixedClassOperand()
{
if (getClass())
return this;
return NULL;
}
Operand*
Operand::merge(Operand* other)
{
if (getKnowledgeLevel() > other->getKnowledgeLevel())
return other->merge1(this);
else
return merge1(other);
}
Operand*
Operand::merge1(Operand* other)
{
if (this == other)
return this;
else
return NULL;
}
Operand*
IconstOperand::merge1(Operand* other)
{
TR_ASSERT(other->getKnowledgeLevel() >= this->getKnowledgeLevel(), "Should be calling other->merge1(this)");
IconstOperand* otherIconst = other->asIconst();
if (otherIconst && this->intValue == otherIconst->intValue)
return this;
else
return NULL;
}
// TODO: check instanceOf relationship and create new Operand if neccessary
Operand*
ObjectOperand::merge1(Operand* other)
{
TR_ASSERT(other->getKnowledgeLevel() >= this->getKnowledgeLevel(), "Should be calling other->merge1(this)");
ObjectOperand* otherObject = other->asObjectOperand();
if (otherObject && this->_clazz == otherObject->_clazz)
return this;
else
return NULL;
}
// Both are preexistent objects
Operand*
PreexistentObjectOperand::merge1(Operand* other)
{
TR_ASSERT(other->getKnowledgeLevel() >= this->getKnowledgeLevel(), "Should be calling other->merge1(this)");
PreexistentObjectOperand* otherPreexistentObjectOperand = other->asPreexistentObjectOperand();
if (otherPreexistentObjectOperand && this->_clazz == otherPreexistentObjectOperand->_clazz)
return this;
else
return NULL;
}
Operand*
FixedClassOperand::merge1(Operand* other)
{
TR_ASSERT(other->getKnowledgeLevel() >= this->getKnowledgeLevel(), "Should be calling other->merge1(this)");
FixedClassOperand* otherFixedClass = other->asFixedClassOperand();
if (otherFixedClass && this->_clazz == otherFixedClass->_clazz)
return this;
else
return NULL;
}
Operand*
KnownObjOperand::merge1(Operand* other)
{
TR_ASSERT(other->getKnowledgeLevel() >= this->getKnowledgeLevel(), "Should be calling other->merge1(this)");
KnownObjOperand* otherKnownObj = other->asKnownObject();
if (otherKnownObj && this->knownObjIndex == otherKnownObj->knownObjIndex)
return this;
else
return NULL;
}
Operand*
MutableCallsiteTargetOperand::merge1(Operand* other)
{
TR_ASSERT(other->getKnowledgeLevel() >= this->getKnowledgeLevel(), "Should be calling other->merge1(this)");
MutableCallsiteTargetOperand* otherMutableCallsiteTarget = other->asMutableCallsiteTargetOperand();
if (otherMutableCallsiteTarget &&
this->mutableCallsiteIndex== otherMutableCallsiteTarget->mutableCallsiteIndex &&
this->methodHandleIndex == otherMutableCallsiteTarget->methodHandleIndex)
return this;
else
return NULL;
}
void
Operand::printToString(TR::StringBuf *buf)
{
buf->appendf("(unknown)");
}
void
IconstOperand::printToString(TR::StringBuf *buf)
{
buf->appendf("(iconst=%d)", intValue);
}
void
ObjectOperand::printToString(TR::StringBuf *buf)
{
buf->appendf("(%s=clazz%p)", KnowledgeStrings[getKnowledgeLevel()], getClass());
}
void
KnownObjOperand::printToString(TR::StringBuf *buf)
{
buf->appendf("(obj%d)", getKnownObjectIndex());
}
void
MutableCallsiteTargetOperand::printToString(TR::StringBuf *buf)
{
buf->appendf("(mh=%d, mcs=%d)", getMethodHandleIndex(), getMutableCallsiteIndex());
}
void
InterpreterEmulator::printOperandArray(OperandArray* operands)
{
int32_t size = operands->size();
for (int32_t i = 0; i < size; i++)
{
_operandBuf->clear();
(*operands)[i]->printToString(_operandBuf);
traceMsg(comp(), "[%d]=%s, ", i, _operandBuf->text());
}
if (size > 0)
traceMsg(comp(), "\n");
}
// Merge second OperandArray into the first one
// The merge does a union
//
void InterpreterEmulator::mergeOperandArray(OperandArray *first, OperandArray *second)
{
bool enableTrace = tracer()->debugLevel();
if (enableTrace)
{
traceMsg(comp(), "Operands before merging:\n");
printOperandArray(first);
}
bool changed = false;
for (int i = 0; i < _numSlots; i++)
{
Operand* firstObj = (*first)[i];
Operand* secondObj = (*second)[i];
firstObj = firstObj->merge(secondObj);
if (firstObj == NULL)
firstObj = _unknownOperand;
if (firstObj != (*first)[i])
changed = true;
}
if (enableTrace)
{
if (changed)
{
traceMsg(comp(), "Operands after merging:\n");
printOperandArray(first);
}
else
traceMsg(comp(), "Operands is not changed after merging\n");
}
}
void
InterpreterEmulator::maintainStackForIf(TR_J9ByteCode bc)
{
TR_ASSERT_FATAL(_iteratorWithState, "has to be called when the iterator has state!");
TR_ASSERT_FATAL(bc == J9BCificmpeq || bc == J9BCificmpne, "InterpreterEmulator::maintainStackForIf can only be called with J9BCificmpeq and J9BCificmpne\n");
int32_t branchBC = _bcIndex + next2BytesSigned();
int32_t fallThruBC = _bcIndex + 3;
IconstOperand * second = pop()->asIconst();
IconstOperand * first = pop()->asIconst();
bool canBranch = true;
bool canFallThru = true;
// Comment out the branch folding as all the paths have to be interpreted in order
// to propagate object info in operand stack or local slots. Since branch folding
// currently only affects thunk archetypes, with similar branch folding in ilgen,
// calls in dead path won't be inlined, disabling the following code doesn't affect
// performance
// TODO: add code to record dead path and ignore it in object info propagation, enable
// the following code if branch folding is possible in LambdaForm methods
//
if (false && second && first)
{
switch (bc)
{
case J9BCificmpeq:
canBranch = second->intValue == first->intValue;
debugTrace(tracer(), "maintainStackForIf ifcmpeq %d == %d\n", second->intValue, first->intValue);
break;
case J9BCificmpne:
canBranch = second->intValue != first->intValue;
debugTrace(tracer(), "maintainStackForIf ifcmpne %d != %d\n", second->intValue, first->intValue);
break;
default:
break;
}
canFallThru = !canBranch;
}
// The branch target can be successor of the fall through, so gen fall through block first such
// that the predecessor is interpreted before the successor in order to propagate the operand
// stack and local slots state.
// This doesn't work when the fall through contain control flow, but there is no functional issue
// as the object info won't be propagated if there exists unvisited predecessor. This will be
// fixed when we traverse the bytecodes in reverse post order at CFG level.
//
if (canFallThru)
{
debugTrace(tracer(), "maintainStackForIf canFallThrough to bcIndex=%d\n", fallThruBC);
genTarget(fallThruBC);
}
if (canBranch)
{
debugTrace(tracer(), "maintainStackForIf canBranch to bcIndex=%d\n", branchBC);
genTarget(branchBC);
}
}
void
InterpreterEmulator::maintainStackForGetField()
{
TR_ASSERT_FATAL(_iteratorWithState, "has to be called when the iterator has state!");
TR::DataType type = TR::NoType;
uint32_t fieldOffset;
int32_t cpIndex = next2Bytes();
Operand *newOperand = _unknownOperand;
TR::Symbol *fieldSymbol = TR::Symbol::createPossiblyRecognizedShadowFromCP(
comp(), trStackMemory(), _calltarget->_calleeMethod, cpIndex, &type, &fieldOffset, false);
TR::KnownObjectTable *knot = comp()->getKnownObjectTable();
if (knot &&
top()->asKnownObject() &&
!knot->isNull(top()->getKnownObjectIndex())
&& type == TR::Address)
{
if (fieldSymbol == NULL)
{
debugTrace(tracer(), "field is unresolved");
}
else if (!comp()->fej9()->canDereferenceAtCompileTimeWithFieldSymbol(fieldSymbol, cpIndex, _calltarget->_calleeMethod))
{
debugTrace(tracer(), "field is not foldable");
}
else
{
TR::KnownObjectTable::Index baseObjectIndex = top()->getKnownObjectIndex();
TR::KnownObjectTable::Index resultIndex = TR::KnownObjectTable::UNKNOWN;
uintptr_t baseObjectAddress = 0;
uintptr_t fieldAddress = 0;
bool avoidFolding = true;
#if defined(J9VM_OPT_JITSERVER)
if (comp()->isOutOfProcessCompilation())
{
TR_ResolvedJ9JITServerMethod *serverMethod = static_cast<TR_ResolvedJ9JITServerMethod*>(_calltarget->_calleeMethod);
TR_ResolvedMethod *clientMethod = serverMethod->getRemoteMirror();
auto stream = TR::CompilationInfo::getStream();
stream->write(JITServer::MessageType::KnownObjectTable_dereferenceKnownObjectField,
baseObjectIndex, clientMethod, cpIndex);
auto recv = stream->read<TR::KnownObjectTable::Index, uintptr_t*, uintptr_t, uintptr_t, bool>();
resultIndex = std::get<0>(recv);
uintptr_t *objectPointerReference = std::get<1>(recv);
fieldAddress = std::get<2>(recv);
baseObjectAddress = std::get<3>(recv);
avoidFolding = std::get<4>(recv);
if (resultIndex != TR::KnownObjectTable::UNKNOWN)
knot->updateKnownObjectTableAtServer(resultIndex, objectPointerReference);
}
else
#endif /* defined(J9VM_OPT_JITSERVER) */
{
TR::VMAccessCriticalSection dereferenceKnownObjectField(comp()->fej9());
baseObjectAddress = knot->getPointer(baseObjectIndex);
TR_OpaqueClassBlock *baseObjectClass = comp()->fej9()->getObjectClass(baseObjectAddress);
TR_OpaqueClassBlock *fieldDeclaringClass = _calltarget->_calleeMethod->getDeclaringClassFromFieldOrStatic(comp(), cpIndex);
avoidFolding = TR::TransformUtil::avoidFoldingInstanceField(
baseObjectAddress, fieldSymbol, fieldOffset, cpIndex, _calltarget->_calleeMethod, comp());
if (fieldDeclaringClass && comp()->fej9()->isInstanceOf(baseObjectClass, fieldDeclaringClass, true) == TR_yes)
{
fieldAddress = comp()->fej9()->getReferenceFieldAtAddress(baseObjectAddress + fieldOffset);
resultIndex = knot->getOrCreateIndex(fieldAddress);
}
}
bool fail = resultIndex == TR::KnownObjectTable::UNKNOWN;
if (fail || avoidFolding)
{
int32_t len = 0;
debugTrace(
tracer(),
"%s field in obj%d: %s",
fail ? "failed to determine value of" : "avoid folding sometimes-foldable",
baseObjectIndex,
_calltarget->_calleeMethod->fieldName(cpIndex, len, this->trMemory()));
}
else
{
// It's OK to print fieldAddress and baseObjectAddress here even
// without VM access. There's no meaningful difference between:
// - printing the object's address, then allowing it to move; and
// - observing the objects's address, then allowing it to move,
// then finally printing the observed address.
newOperand = new (trStackMemory()) KnownObjOperand(resultIndex);
int32_t len = 0;
debugTrace(tracer(), "dereference obj%d (%p)from field %s(offset = %d) of base obj%d(%p)\n",
newOperand->getKnownObjectIndex(), (void *)fieldAddress, _calltarget->_calleeMethod->fieldName(cpIndex, len, this->trMemory()),
fieldOffset, baseObjectIndex, baseObjectAddress);
}
}
}
pop();
push(newOperand);
}
void
InterpreterEmulator::saveStack(int32_t targetIndex)
{
if (!_iteratorWithState)
return;
// Propagate stack state to successor
if (!_stack->isEmpty())
{
if (!_stacks[targetIndex])
_stacks[targetIndex] = new (trStackMemory()) ByteCodeStack(*_stack);
else
{
TR_ASSERT_FATAL(_stacks[targetIndex]->size() == _stack->size(), "operand stack from two paths must have the same size, predecessor bci %d target bci %d\n", _bcIndex, targetIndex);
mergeOperandArray(_stacks[targetIndex], _stack);
}
}
// Propagate local object info to successor
if (_numSlots)
{
if (!_localObjectInfos[targetIndex])
_localObjectInfos[targetIndex] = new (trStackMemory()) OperandArray(*_currentLocalObjectInfo);
else
mergeOperandArray(_localObjectInfos[targetIndex], _currentLocalObjectInfo);
}
}
void
InterpreterEmulator::initializeIteratorWithState()
{
_iteratorWithState = true;
_unknownOperand = new (trStackMemory()) Operand();
uint32_t size = this->maxByteCodeIndex() + 5;
_flags = (flags8_t *) this->trMemory()->allocateStackMemory(size * sizeof(flags8_t));
_stacks = (ByteCodeStack * *) this->trMemory()->allocateStackMemory(size * sizeof(ByteCodeStack *));
memset(_flags, 0, size * sizeof(flags8_t));
memset(_stacks, 0, size * sizeof(ByteCodeStack *));
_stack = new (trStackMemory()) TR_Stack<Operand *>(this->trMemory(), 20, false, stackAlloc);
_localObjectInfos = (OperandArray**) this->trMemory()->allocateStackMemory(size * sizeof(OperandArray *));
memset(_localObjectInfos, 0, size * sizeof(OperandArray *));
int32_t numParmSlots = method()->numberOfParameterSlots();
_numSlots = numParmSlots + method()->numberOfTemps();
genBBStart(0);
setupBBStartContext(0);
this->setIndex(0);
}
void
InterpreterEmulator::setupMethodEntryLocalObjectState()
{
TR_PrexArgInfo *argInfo = _calltarget->_ecsPrexArgInfo;
if (argInfo)
{
TR_ASSERT_FATAL(argInfo->getNumArgs() == method()->numberOfParameters(), "Prex arg number should match parm number");
if(tracer()->heuristicLevel())
{
heuristicTrace(tracer(), "Save argInfo to slot state array");
argInfo->dumpTrace();
}
method()->makeParameterList(_methodSymbol);
ListIterator<TR::ParameterSymbol> parms(&_methodSymbol->getParameterList());
// save prex arg into local var arrays
for (TR::ParameterSymbol *p = parms.getFirst(); p != NULL; p = parms.getNext())
{
int32_t ordinal = p->getOrdinal();
int32_t slotIndex = p->getSlot();
TR_PrexArgument *prexArgument = argInfo->get(ordinal);
if (!prexArgument)
{
(*_currentLocalObjectInfo)[slotIndex] = _unknownOperand;
}
else
{
auto operand = createOperandFromPrexArg(prexArgument);
if (operand)
{
(*_currentLocalObjectInfo)[slotIndex] = operand;
}
else
(*_currentLocalObjectInfo)[slotIndex] = _unknownOperand;
}
if (tracer()->heuristicLevel())
{
_operandBuf->clear();
(*_currentLocalObjectInfo)[slotIndex]->printToString(_operandBuf);
heuristicTrace(
tracer(),
"Creating operand %s for parm %d slot %d from PrexArgument %p",
_operandBuf->text(),
ordinal,
slotIndex,
prexArgument);
}
}
}
}
bool
InterpreterEmulator::hasUnvisitedPred(TR::Block* block)
{
TR_PredecessorIterator pi(block);
for (TR::CFGEdge *edge = pi.getFirst(); edge != NULL; edge = pi.getNext())
{
TR::Block *fromBlock = toBlock(edge->getFrom());
auto fromBCIndex = fromBlock->getEntry()->getNode()->getByteCodeIndex();
if (!isGenerated(fromBCIndex))
{
return true;
}
}
return false;
}
void
InterpreterEmulator::setupBBStartStackState(int32_t index)
{
if (index == 0)
return;
auto block = blocks(index);
auto stack = _stacks[index];
if (stack && hasUnvisitedPred(block))
{
heuristicTrace(tracer(), "block_%d at bc index %d has unvisited predecessor, setting stack operand info to unknown", block->getNumber(), index);
for (int32_t i = 0; i < stack->size(); ++i)
(*stack)[i] = _unknownOperand;
}
}
void
InterpreterEmulator::setupBBStartLocalObjectState(int32_t index)
{
if (_numSlots == 0)
return;
if (!_localObjectInfos[index])
{
_localObjectInfos[index] = new (trStackMemory()) OperandArray(trMemory(), _numSlots, false, stackAlloc);
for (int32_t i = 0; i < _numSlots; i++)
(*_localObjectInfos[index])[i] = _unknownOperand;
}
else if (hasUnvisitedPred(blocks(index)))
{
heuristicTrace(tracer(), "block_%d at bc index %d has unvisited predecessor, setting local object info to unknown", blocks(index)->getNumber(), index);
for (int32_t i = 0; i < _numSlots; i++)
(*_localObjectInfos[index])[i] = _unknownOperand;
}
_currentLocalObjectInfo = _localObjectInfos[index];
if (index == 0)
setupMethodEntryLocalObjectState();
}
int32_t
InterpreterEmulator::setupBBStartContext(int32_t index)
{
if (_iteratorWithState)
{
setupBBStartStackState(index);
setupBBStartLocalObjectState(index);
}
Base::setupBBStartContext(index);
return index;
}
bool
InterpreterEmulator::maintainStack(TR_J9ByteCode bc)
{
TR_ASSERT_FATAL(_iteratorWithState, "has to be called when the iterator has state!");
int slotIndex = -1;
switch (bc)
{
case J9BCgetfield: maintainStackForGetField(); break;
case J9BCaload0: slotIndex = 0; maintainStackForAload(slotIndex); break;
case J9BCaload1: slotIndex = 1; maintainStackForAload(slotIndex); break;
case J9BCaload2: slotIndex = 2; maintainStackForAload(slotIndex); break;
case J9BCaload3: slotIndex = 3; maintainStackForAload(slotIndex); break;
case J9BCaload: slotIndex = nextByte(); maintainStackForAload(slotIndex); break;
case J9BCaloadw: slotIndex = next2Bytes(); maintainStackForAload(slotIndex); break;
case J9BCinvokespecial:
case J9BCinvokespecialsplit:
case J9BCinvokevirtual:
case J9BCinvokestatic:
case J9BCinvokestaticsplit:
case J9BCinvokedynamic:
case J9BCinvokehandle:
maintainStackForCall();
break;
case J9BCiconstm1: push (new (trStackMemory()) IconstOperand(-1)); break;
case J9BCiconst0: push (new (trStackMemory()) IconstOperand(0)); break;
case J9BCiconst1: push (new (trStackMemory()) IconstOperand(1)); break;
case J9BCiconst2: push (new (trStackMemory()) IconstOperand(2)); break;
case J9BCiconst3: push (new (trStackMemory()) IconstOperand(3)); break;
case J9BCiconst4: push (new (trStackMemory()) IconstOperand(4)); break;
case J9BCiconst5: push (new (trStackMemory()) IconstOperand(5)); break;
case J9BCifne:
push (new (trStackMemory()) IconstOperand(0));
maintainStackForIf(J9BCificmpne);
break;
case J9BCifeq:
push (new (trStackMemory()) IconstOperand(0));
maintainStackForIf(J9BCificmpeq);
break;
case J9BCgoto:
genTarget(bcIndex() + next2BytesSigned());
break;
case J9BCpop:
case J9BCputfield:
case J9BCputstatic:
pop();
break;
case J9BCladd:
case J9BCiadd:
case J9BCisub:
case J9BCiand:
popn(2);
pushUnknownOperand();
break;
case J9BCistore: case J9BClstore: case J9BCfstore: case J9BCdstore:
case J9BCistorew: case J9BClstorew: case J9BCfstorew: case J9BCdstorew:
case J9BCistore0: case J9BCistore1: case J9BCistore2: case J9BCistore3:
case J9BClstore0: case J9BClstore1: case J9BClstore2: case J9BClstore3:
case J9BCfstore0: case J9BCfstore1: case J9BCfstore2: case J9BCfstore3:
case J9BCdstore0: case J9BCdstore1: case J9BCdstore2: case J9BCdstore3:
pop();
break;
// Maintain stack for object store
case J9BCastorew: maintainStackForAstore(next2Bytes()); break;
case J9BCastore: maintainStackForAstore(nextByte()); break;
case J9BCastore0: maintainStackForAstore(0); break;
case J9BCastore1: maintainStackForAstore(1); break;
case J9BCastore2: maintainStackForAstore(2); break;
case J9BCastore3: maintainStackForAstore(3); break;
case J9BCiload0: case J9BCiload1: case J9BCiload2: case J9BCiload3:
case J9BCdload0: case J9BCdload1: case J9BCdload2: case J9BCdload3:
case J9BClload0: case J9BClload1: case J9BClload2: case J9BClload3:
case J9BCfload0: case J9BCfload1: case J9BCfload2: case J9BCfload3:
case J9BCiloadw: case J9BClloadw: case J9BCfloadw: case J9BCdloadw:
case J9BCiload: case J9BClload: case J9BCfload: case J9BCdload:
pushUnknownOperand();
break;
case J9BCgetstatic:
maintainStackForGetStatic();
break;
case J9BCgenericReturn:
case J9BCReturnC:
case J9BCReturnS:
case J9BCReturnB:
case J9BCReturnZ:
maintainStackForReturn();
break;
case J9BCi2l:
break;
case J9BCcheckcast:
break;
case J9BCdup:
push(top());
break;
case J9BCldc:
maintainStackForldc(nextByte()); break;
default:
static const bool assertfatal = feGetEnv("TR_AssertFatalForUnexpectedBytecodeInMethodHandleThunk") ? true: false;
if (!assertfatal)
debugTrace(tracer(), "unexpected bytecode in thunk archetype %s (%p) at bcIndex %d %s (%d)\n", _calltarget->_calleeMethod->signature(comp()->trMemory()), _calltarget, bcIndex(), comp()->fej9()->getByteCodeName(nextByte(0)), bc);
else
TR_ASSERT_FATAL(0, "unexpected bytecode in thunk archetype %s (%p) at bcIndex %d %s (%d)\n", _calltarget->_calleeMethod->signature(comp()->trMemory()), _calltarget, bcIndex(), comp()->fej9()->getByteCodeName(nextByte(0)), bc);
TR::DebugCounter::incStaticDebugCounter(comp(),
TR::DebugCounter::debugCounterName(comp(),
"InterpreterEmulator.unexpectedBytecode/(root=%s)/(%s)/bc=%d/%s",
comp()->signature(),
_calltarget->_calleeMethod->signature(comp()->trMemory()),
_bcIndex,
comp()->fej9()->getByteCodeName(nextByte(0)))
);
return false;
}
return true;
}
void
InterpreterEmulator::maintainStackForReturn()
{
if (method()->returnType() != TR::NoType)
pop();
}
void
InterpreterEmulator::maintainStackForGetStatic()
{
TR_ASSERT_FATAL(_iteratorWithState, "has to be called when the iterator has state!");
if (comp()->compileRelocatableCode())
{
pushUnknownOperand();
return;
}
int32_t cpIndex = next2Bytes();
debugTrace(tracer(), "getstatic cpIndex %d", cpIndex);
void * dataAddress;
bool isVolatile, isPrivate, isUnresolvedInCP, isFinal;
TR::DataType type = TR::NoType;
auto owningMethod = _calltarget->_calleeMethod;
bool resolved = owningMethod->staticAttributes(
comp(),
cpIndex,
&dataAddress,
&type,
&isVolatile,
&isFinal,
&isPrivate,
false,
&isUnresolvedInCP);
TR::KnownObjectTable::Index knownObjectIndex = TR::KnownObjectTable::UNKNOWN;
if (resolved && isFinal && type == TR::Address)
{
knownObjectIndex = TR::TransformUtil::knownObjectFromFinalStatic(
comp(), owningMethod, cpIndex, dataAddress);
}
if (knownObjectIndex != TR::KnownObjectTable::UNKNOWN)
push(new (trStackMemory()) KnownObjOperand(knownObjectIndex));
else
pushUnknownOperand();
}
void
InterpreterEmulator::maintainStackForAload(int slotIndex)
{
TR_ASSERT_FATAL(_iteratorWithState, "has to be called when the iterator has state!");
push((*_currentLocalObjectInfo)[slotIndex]);
}
void
InterpreterEmulator::maintainStackForAstore(int slotIndex)
{
TR_ASSERT_FATAL(_iteratorWithState, "has to be called when the iterator has state!");
(*_currentLocalObjectInfo)[slotIndex] = pop();
}
void
InterpreterEmulator::maintainStackForldc(int32_t cpIndex)
{
TR::DataType type = method()->getLDCType(cpIndex);
switch (type)
{
case TR::Address:
// TODO: should add a function to check if cp entry is unresolved for all constant
// not just for string. Currently only do it for string because it may be patched
// to a different object in OpenJDK MethodHandle implementation
//
if (method()->isStringConstant(cpIndex) && !method()->isUnresolvedString(cpIndex))
{
uintptr_t * location = (uintptr_t *)method()->stringConstant(cpIndex);
TR::KnownObjectTable *knot = comp()->getKnownObjectTable();
if (knot)
{
TR::KnownObjectTable::Index koi = knot->getOrCreateIndexAt(location);
push(new (trStackMemory()) KnownObjOperand(koi));
debugTrace(tracer(), "aload known obj%d from ldc %d", koi, cpIndex);
return;
}
}
break;
default:
break;
}
pushUnknownOperand();
}
void
InterpreterEmulator::maintainStackForCall(Operand *result, int32_t numArgs, TR::DataType returnType)
{
TR_ASSERT_FATAL(_iteratorWithState, "has to be called when the iterator has state!");
for (int i = 1; i <= numArgs; i++)
pop();
if (result)
push(result);
else if (returnType != TR::NoType)
pushUnknownOperand();
}
void
InterpreterEmulator::maintainStackForCall()
{
TR_ASSERT_FATAL(_iteratorWithState, "has to be called when the iterator has state!");
int32_t numOfArgs = 0;
TR::DataType returnType = TR::NoType;
Operand* result = NULL;
if (_currentCallMethod)
result = getReturnValue(_currentCallMethod);
// If the caller is thunk archetype, the load of parm `argPlaceholder` can
// be expanded to loads of multiple arguments, so we can't pop the number
// of arguments of a refined call
//
if (_currentCallSite && !_callerIsThunkArchetype)
{
if (_currentCallSite->_isInterface)
{
numOfArgs = _currentCallSite->_interfaceMethod->numberOfExplicitParameters() + 1;
returnType = _currentCallSite->_interfaceMethod->returnType();
}
else if (_currentCallSite->_initialCalleeMethod)
{
numOfArgs = _currentCallSite->_initialCalleeMethod->numberOfParameters();
returnType = _currentCallSite->_initialCalleeMethod->returnType();
}
}
else
{
int32_t cpIndex = next2Bytes();
bool isStatic = false;
switch (current())
{
case J9BCinvokespecialsplit:
cpIndex |= J9_SPECIAL_SPLIT_TABLE_INDEX_FLAG;
break;
case J9BCinvokestaticsplit:
cpIndex |= J9_STATIC_SPLIT_TABLE_INDEX_FLAG;
case J9BCinvokestatic:
isStatic = true;
break;
case J9BCinvokedynamic:
case J9BCinvokehandle:
TR_ASSERT_FATAL(false, "Can't maintain stack for unresolved invokehandle");
break;
default:
break;
}
TR::Method * calleeMethod = comp()->fej9()->createMethod(trMemory(), _calltarget->_calleeMethod->containingClass(), cpIndex);
numOfArgs = calleeMethod->numberOfExplicitParameters() + (isStatic ? 0 : 1);
returnType = calleeMethod->returnType();
}
maintainStackForCall(result, numOfArgs, returnType);
}
void
InterpreterEmulator::dumpStack()
{
if (!tracer()->debugLevel())
return;
debugTrace(tracer(), "operandStack after bytecode %d : %s ", _bcIndex, comp()->fej9()->getByteCodeName(nextByte(0)));
for (int i = 0; i < _stack->size(); i++ )
{
Operand *x = (*_stack)[i];
_operandBuf->clear();
x->printToString(_operandBuf);
debugTrace(tracer(), "[%d]=%s", i, _operandBuf->text());
}
}
Operand *
InterpreterEmulator::getReturnValue(TR_ResolvedMethod *callee)
{
if (!callee)
return NULL;
Operand *result = NULL;
TR::RecognizedMethod recognizedMethod = callee->getRecognizedMethod();
TR::KnownObjectTable *knot = comp()->getKnownObjectTable();
TR::IlGeneratorMethodDetails & details = comp()->ilGenRequest().details();
if (_callerIsThunkArchetype && details.isMethodHandleThunk())
{
J9::MethodHandleThunkDetails & thunkDetails = static_cast<J9::MethodHandleThunkDetails &>(details);
if (!thunkDetails.isCustom())
recognizedMethod = TR::unknownMethod;
}
switch (recognizedMethod)
{
case TR::java_lang_invoke_ILGenMacros_isCustomThunk:
result = new (trStackMemory()) IconstOperand(1);
break;
case TR::java_lang_invoke_ILGenMacros_isShareableThunk:
result = new (trStackMemory()) IconstOperand(0);
break;
#if defined(J9VM_OPT_OPENJDK_METHODHANDLE)
case TR::java_lang_invoke_DelegatingMethodHandle_getTarget:
{
TR::KnownObjectTable::Index dmhIndex = top()->getKnownObjectIndex();
bool trace = tracer()->debugLevel();
TR::KnownObjectTable::Index targetIndex =
comp()->fej9()->delegatingMethodHandleTarget(comp(), dmhIndex, trace);
if (targetIndex == TR::KnownObjectTable::UNKNOWN)
return NULL;
result = new (trStackMemory()) KnownObjOperand(targetIndex);
break;
}
#endif
case TR::java_lang_invoke_MutableCallSite_getTarget:
case TR::java_lang_invoke_Invokers_getCallSiteTarget:
{
// The CallSite object is always topmost on the stack.
TR::KnownObjectTable::Index callSiteIndex = top()->getKnownObjectIndex();
if (callSiteIndex == TR::KnownObjectTable::UNKNOWN)
return NULL;
TR::KnownObjectTable::Index resultIndex = TR::KnownObjectTable::UNKNOWN;
const char * const mcsClassName = "java/lang/invoke/MutableCallSite";
const int mcsClassNameLen = (int)strlen(mcsClassName);
TR_OpaqueClassBlock *mutableCallsiteClass =
fe()->getSystemClassFromClassName(mcsClassName, mcsClassNameLen, true);
debugTrace(tracer(), "potential MCS target: call site obj%d(*%p) mutableCallsiteClass %p\n", callSiteIndex, knot->getPointerLocation(callSiteIndex), mutableCallsiteClass);
if (mutableCallsiteClass)
{
if (recognizedMethod != TR::java_lang_invoke_MutableCallSite_getTarget)
{
TR_OpaqueClassBlock *callSiteType =
fe()->getObjectClassFromKnownObjectIndex(comp(), callSiteIndex);
if (callSiteType == NULL)
{
debugTrace(tracer(), "failed to determine concrete CallSite type");
return NULL;
}
else if (fe()->isInstanceOf(callSiteType, mutableCallsiteClass, true) != TR_yes)
{
debugTrace(tracer(), "not a MutableCallSite");
return NULL;
}
}
#if defined(J9VM_OPT_JITSERVER)
if (comp()->isOutOfProcessCompilation())
{
auto stream = TR::CompilationInfo::getStream();
stream->write(JITServer::MessageType::KnownObjectTable_dereferenceKnownObjectField2, mutableCallsiteClass, callSiteIndex);
auto recv = stream->read<TR::KnownObjectTable::Index, uintptr_t*>();
resultIndex = std::get<0>(recv);
uintptr_t *objectPointerReference = std::get<1>(recv);
if (resultIndex != TR::KnownObjectTable::UNKNOWN)
{
knot->updateKnownObjectTableAtServer(resultIndex, objectPointerReference);
}
result = new (trStackMemory()) MutableCallsiteTargetOperand(resultIndex, callSiteIndex);
}
else
#endif /* defined(J9VM_OPT_JITSERVER) */
{
TR::VMAccessCriticalSection dereferenceKnownObjectField(comp()->fej9());
int32_t targetFieldOffset = comp()->fej9()->getInstanceFieldOffset(mutableCallsiteClass, "target", "Ljava/lang/invoke/MethodHandle;");
uintptr_t receiverAddress = knot->getPointer(callSiteIndex);
TR_OpaqueClassBlock *receiverClass = comp()->fej9()->getObjectClass(receiverAddress);
TR_ASSERT_FATAL(comp()->fej9()->isInstanceOf(receiverClass, mutableCallsiteClass, true) == TR_yes, "receiver of mutableCallsite_getTarget must be instance of MutableCallSite (*%p)", knot->getPointerLocation(callSiteIndex));
uintptr_t fieldAddress = comp()->fej9()->getReferenceFieldAt(receiverAddress, targetFieldOffset);
resultIndex = knot->getOrCreateIndex(fieldAddress);
result = new (trStackMemory()) MutableCallsiteTargetOperand(resultIndex, callSiteIndex);
}
}
}
break;
case TR::java_lang_invoke_DirectMethodHandle_internalMemberName:
case TR::java_lang_invoke_DirectMethodHandle_internalMemberNameEnsureInit:
{
Operand* mh = top();