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J9EstimateCodeSize.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 <algorithm>
#include "codegen/CodeGenerator.hpp"
#include "compile/InlineBlock.hpp"
#include "compile/Method.hpp"
#include "compile/ResolvedMethod.hpp"
#if defined(J9VM_OPT_JITSERVER)
#include "env/j9methodServer.hpp"
#endif /* defined(J9VM_OPT_JITSERVER) */
#include "env/VMJ9.h"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "il/ParameterSymbol.hpp"
#include "il/TreeTop.hpp"
#include "il/TreeTop_inlines.hpp"
#include "optimizer/PreExistence.hpp"
#include "optimizer/J9CallGraph.hpp"
#include "optimizer/J9EstimateCodeSize.hpp"
#include "optimizer/InterpreterEmulator.hpp"
#include "ras/LogTracer.hpp"
#include "runtime/J9Profiler.hpp"
// Empirically determined value
const float TR_J9EstimateCodeSize::STRING_COMPRESSION_ADJUSTMENT_FACTOR = 0.75f;
// There was no analysis done to determine this factor. It was chosen by intuition.
const float TR_J9EstimateCodeSize::METHOD_INVOKE_ADJUSTMENT_FACTOR = 0.20f;
/*
DEFINEs are ugly in general, but putting
if (tracer)
heuristicTrace(...)
everywhere in this class seems to be a much worse idea.
Unfortunately, C++98 doesn't have a good way to forward varargs
except for using a DEFINE
*/
#define heuristicTraceIfTracerIsNotNull(r, ...) \
if (r) { \
if ((r)->heuristicLevel()) { (r)->alwaysTraceM(__VA_ARGS__); } \
}
class NeedsPeekingHeuristic
{
public:
static const int default_distance = 25;
static const int NUM_LOADS = 4;
NeedsPeekingHeuristic(TR_CallTarget* calltarget, TR_J9ByteCodeIterator& bci, TR::ResolvedMethodSymbol* methodSymbol, TR::Compilation* comp, int d = default_distance) :
_hasArgumentsInfo(false),
_size(0),
_bci(bci),
_distance(d),
_numOfArgs(0),
_needsPeeking(false),
_tracer(0)
{
TR_PrexArgInfo* argInfo = calltarget->_ecsPrexArgInfo;
//no argInfo available for this caller
if (!argInfo)
return;
int i = 0;
int32_t numParms = methodSymbol->getParameterList().getSize();
_numOfArgs = numParms;
ListIterator<TR::ParameterSymbol> parmIt(&methodSymbol->getParameterList());
for (TR::ParameterSymbol *p = parmIt.getFirst(); p; p = parmIt.getNext(), i++)
{
int32_t len;
const char *sig = p->getTypeSignature(len);
if (i >= argInfo->getNumArgs() || //not enough slots in argInfo
*sig != 'L' || //primitive arg
!argInfo->get(i) || //no arg at the i-th slot
!argInfo->get(i)->getClass() //no classInfo at the i-th slot
)
{
continue;
}
TR_OpaqueClassBlock *clazz = comp->fej9()->getClassFromSignature(sig, len, methodSymbol->getResolvedMethod());
if (!clazz)
{
continue;
}
TR_OpaqueClassBlock* argClass = argInfo->get(i)->getClass();
//findCallSiteTarget and validateAndPropagateArgsFromCalleeSymbol
//should take care of incompatible receivers
//this assertion only checks if the receiver is of the right type
//there's no harm in propagating other incompatible arguments
//as soon as one of those becomes a receiver this very same assertion
//should fire
TR_ASSERT(comp->fej9()->isInstanceOf(argClass, clazz, true, true, true) == TR_yes || i != 0 || !calltarget->_myCallSite->_isIndirectCall, "Incompatible receiver should have been handled by findCallSiteTarget");
// even the arg type propagated from the caller might be not more specific
// than the type got from callee signature, we should still try to
// do peeking. if we don't do peeking here, we will lose the chance to propagate
// the type info to the callsites of this calltarget.
static const bool keepBogusPeekingCondition = feGetEnv("TR_DisableBogusPeekingCondition") ? false: true;
if ( !keepBogusPeekingCondition || clazz != argClass ) //if two classes aren't equal it follows that argClass is more specific
//argsClass can either be equal to or a subclass of clazz
//see validateAndPropagateArgsFromCalleeSymbol
{
_hasArgumentsInfo = true;
_argInfo = argInfo;
}
/*
if (comp->fej9()->isInstanceOf (argClass, clazz, true, true, true) == TR_yes)
{
if (clazz != argClass)
_hasArgumentsInfo = true;
}
else
{
_hasArgumentsInfo = false;
return; // _hasArgumentsInfo will be equal to false and no propagation is going to happen
// because the incoming type information is not compatible
}
*/
}
};
void setTracer(TR_InlinerTracer *trc)
{
_tracer = trc;
heuristicTraceIfTracerIsNotNull(_tracer, "NeedsPeekingHeuristic is initialized with the following values: _hasArgumentsInfo = %d, NUM_LOADS = %d, _distance =%d, _needsPeeking = %d", _hasArgumentsInfo, NUM_LOADS, _distance, _needsPeeking);
}
void checkIfThereIsAParmLoadWithinDistance()
{
for (int i = 0; i < _size; i++)
{
if (_bci.bcIndex() - _loadIndices[i] <= _distance)
{
_needsPeeking = true;
heuristicTraceIfTracerIsNotNull(_tracer, "there is a parm load at %d which is within %d of a call at %d", _loadIndices[i], _distance, _bci.bcIndex());
}
}
};
void processByteCode()
{
if (!_hasArgumentsInfo)
return;
TR_J9ByteCode bc = _bci.current();
int slotIndex = -1;
switch (bc)
{
case J9BCaload0:
slotIndex = 0;
break;
case J9BCaload1:
slotIndex = 1;
break;
case J9BCaload2:
slotIndex = 2;
break;
case J9BCaload3:
slotIndex = 3;
break;
case J9BCaload:
slotIndex = _bci.nextByte();
TR_ASSERT(slotIndex >= 0 , "a slot shouldn't be negative");
break;
case J9BCaloadw:
slotIndex = _bci.next2Bytes();
TR_ASSERT(slotIndex >= 0 , "a slot shouldn't be negative");
break;
case J9BCinvokevirtual:
case J9BCinvokespecial:
case J9BCinvokestatic:
case J9BCinvokeinterface:
case J9BCinvokedynamic:
case J9BCinvokehandle:
case J9BCinvokehandlegeneric:
checkIfThereIsAParmLoadWithinDistance ();
default :
break;
}
if (slotIndex >=0)
{
processParameterLoad(slotIndex);
}
};
void processParameterLoad (int slotIndex)
{
//This heuristic simply checks if we indeed hit a parameter load (as opposed to an auto)
//and if we have an argInfo for this slot we would want to propagate
//Note, _hasArgumentsInfo is checked in processByteCode
//we should not even reach this code unless we have some PrexInfo
if (slotIndex < _numOfArgs && _argInfo->get(slotIndex))
{
heuristicTraceIfTracerIsNotNull(_tracer,"came across of a load of slot %d at %d", slotIndex, _bci.bcIndex());
_loadIndices[_size] = _bci.bcIndex();
_size = (_size + 1) % NUM_LOADS;
}
}
bool doPeeking () { return _needsPeeking; };
protected:
int32_t _loadIndices [NUM_LOADS];
int _size;
int _numOfArgs;
int _distance;
TR_J9ByteCodeIterator& _bci;
bool _hasArgumentsInfo;
TR_PrexArgInfo * _argInfo;
bool _needsPeeking;
TR_InlinerTracer * _tracer;
};
#undef heuristicTraceIfTracerIsNotNull
void
TR_J9EstimateCodeSize::setupNode(TR::Node *node, uint32_t bcIndex,
TR_ResolvedMethod *feMethod, TR::Compilation *comp)
{
node->getByteCodeInfo().setDoNotProfile(0);
node->setByteCodeIndex(bcIndex);
node->setInlinedSiteIndex(-10);
node->setMethod(feMethod->getPersistentIdentifier());
}
TR::Block *
TR_J9EstimateCodeSize::getBlock(TR::Compilation *comp, TR::Block * * blocks,
TR_ResolvedMethod *feMethod, int32_t i, TR::CFG & cfg)
{
if (!blocks[i])
{
TR::TreeTop *startTree = TR::TreeTop::create(comp, TR::Node::create(
NULL, TR::BBStart, 0));
TR::TreeTop *endTree = TR::TreeTop::create(comp, TR::Node::create(
NULL, TR::BBEnd, 0));
startTree->join(endTree);
blocks[i] = TR::Block::createBlock(startTree, endTree, cfg);
blocks[i]->setBlockBCIndex(i);
blocks[i]->setNumber(cfg.getNextNodeNumber());
setupNode(startTree->getNode(), i, feMethod, comp);
setupNode(endTree->getNode(), i, feMethod, comp);
cfg.addNode(blocks[i]);
}
return blocks[i];
}
static TR::ILOpCodes convertBytecodeToIL (TR_J9ByteCode bc)
{
switch (bc)
{
case J9BCifeq: return TR::ificmpeq;
case J9BCifne: return TR::ificmpne;
case J9BCiflt: return TR::ificmplt;
case J9BCifge: return TR::ificmpge;
case J9BCifgt: return TR::ificmpgt;
case J9BCifle: return TR::ificmple;
case J9BCifnull: return TR::ifacmpeq;
case J9BCifnonnull: return TR::ifacmpne;
case J9BCificmpeq: return TR::ificmpeq;
case J9BCificmpne: return TR::ificmpne;
case J9BCificmplt: return TR::ificmplt;
case J9BCificmpge: return TR::ificmpge;
case J9BCificmpgt: return TR::ificmpgt;
case J9BCificmple: return TR::ificmple;
case J9BCifacmpeq: return TR::ifacmpeq;
case J9BCifacmpne: return TR::ifacmpne;
case J9BCtableswitch: return TR::table;
case J9BClookupswitch: return TR::lookup;
case J9BCgoto:
case J9BCgotow: return TR::Goto;
case J9BCReturnC: /* fall-through */
case J9BCReturnS: /* fall-through */
case J9BCReturnB: /* fall-through */
case J9BCReturnZ: /* fall-through */
case J9BCgenericReturn: return TR::Return;
case J9BCathrow: return TR::athrow;
default:
TR_ASSERT(0,"Unsupported conversion for now.");
return TR::BadILOp;
}
return TR::BadILOp;
}
void
TR_J9EstimateCodeSize::setupLastTreeTop(TR::Block *currentBlock, TR_J9ByteCode bc,
uint32_t bcIndex, TR::Block *destinationBlock, TR_ResolvedMethod *feMethod,
TR::Compilation *comp)
{
TR::Node *node = TR::Node::createOnStack(NULL, convertBytecodeToIL(bc), 0);
TR::TreeTop *tree = TR::TreeTop::create(comp, node);
setupNode(node, bcIndex, feMethod, comp);
if (node->getOpCode().isBranch())
node->setBranchDestination(destinationBlock->getEntry());
currentBlock->append(tree);
}
//Partial Inlining
bool
TR_J9EstimateCodeSize::isInExceptionRange(TR_ResolvedMethod * feMethod,
int32_t bcIndex)
{
int32_t numExceptionRanges = feMethod->numberOfExceptionHandlers();
if (numExceptionRanges == 0)
return false;
int32_t start, end, catchtype;
for (int32_t i = 0; i < numExceptionRanges; i++)
{
feMethod->exceptionData(i, &start, &end, &catchtype);
if (bcIndex > start && bcIndex < end)
return true;
}
return false;
}
static bool cameFromArchetypeSpecimen(TR_ResolvedMethod *method)
{
if (!method)
return false; // end of recursion
else if (method->convertToMethod()->isArchetypeSpecimen())
return true; // Archetypes often call methods that are never called until the archetype is compiled
else
return cameFromArchetypeSpecimen(method->owningMethod());
}
bool
TR_J9EstimateCodeSize::adjustEstimateForStringCompression(TR_ResolvedMethod* method, int32_t& value, float factor)
{
const uint16_t classNameLength = method->classNameLength();
if ((classNameLength == 16 && !strncmp(method->classNameChars(), "java/lang/String", classNameLength)) ||
(classNameLength == 22 && !strncmp(method->classNameChars(), "java/lang/StringBuffer", classNameLength)) ||
(classNameLength == 23 && !strncmp(method->classNameChars(), "java/lang/StringBuilder", classNameLength)))
{
// A statistical analysis of the number of places certain methods got inlined yielded results which suggest that the
// following recognized methods incurr several percent worth of increase in compile-time at no benefit to throughput.
// As such we can save additional compile-time by not making adjustments to these methods.
if (method->getRecognizedMethod() != TR::java_lang_String_regionMatches &&
method->getRecognizedMethod() != TR::java_lang_String_regionMatches_bool &&
method->getRecognizedMethod() != TR::java_lang_String_equals)
{
value *= factor;
return true;
}
}
return false;
}
/** \details
* The `Method.invoke` API contains a call to `Reflect.getCallerClass()` API which when executed will trigger a
* stack walking operation. Performance wise this is quite expensive. The `Reflect.getCallerClass()` API returns
* the class of the method which called `Method.invoke`, so if we can promote inlining of `Method.invoke` we can
* eliminate the `Reflect.getCallerClass()` call with a simple load, thus avoiding the expensive stack walk.
*/
bool
TR_J9EstimateCodeSize::adjustEstimateForMethodInvoke(TR_ResolvedMethod* method, int32_t& value, float factor)
{
if (method->getRecognizedMethod() == TR::java_lang_reflect_Method_invoke)
{
static const char *factorOverrideChars = feGetEnv("TR_MethodInvokeInlinerFactor");
static const int32_t factorOverride = (factorOverrideChars != NULL) ? atoi(factorOverrideChars) : 0;
if (factorOverride != 0)
{
factor = 1.0f / static_cast<float>(factorOverride);
}
value *= factor;
return true;
}
return false;
}
bool
TR_J9EstimateCodeSize::estimateCodeSize(TR_CallTarget *calltarget, TR_CallStack *prevCallStack, bool recurseDown)
{
if (realEstimateCodeSize(calltarget, prevCallStack, recurseDown, comp()->trMemory()->currentStackRegion()))
{
if (_isLeaf && _realSize > 1)
{
heuristicTrace(tracer(),"Subtracting 1 from sizes because _isLeaf is true");
--_realSize;
--_optimisticSize;
}
return true;
}
return false;
}
TR::CFG&
TR_J9EstimateCodeSize::processBytecodeAndGenerateCFG(TR_CallTarget *calltarget, TR::Region &cfgRegion, TR_J9ByteCodeIterator& bci, NeedsPeekingHeuristic &nph, TR::Block** blocks, flags8_t * flags)
{
char nameBuffer[1024];
const char *callerName = NULL;
if (tracer()->heuristicLevel())
callerName = comp()->fej9()->sampleSignature(
calltarget->_calleeMethod->getPersistentIdentifier(), nameBuffer,
1024, comp()->trMemory());
int size = calltarget->_myCallSite->_isIndirectCall ? 5 : 0;
int32_t maxIndex = bci.maxByteCodeIndex() + 5;
int32_t *bcSizes = (int32_t *) comp()->trMemory()->allocateStackMemory(
maxIndex * sizeof(int32_t));
memset(bcSizes, 0, maxIndex * sizeof(int32_t));
bool blockStart = true;
bool thisOnStack = false;
bool hasThisCalls = false;
bool foundNewAllocation = false;
bool unresolvedSymbolsAreCold = comp()->notYetRunMeansCold();
TR_ByteCodeInfo newBCInfo;
newBCInfo.setDoNotProfile(0);
if (_mayHaveVirtualCallProfileInfo)
newBCInfo.setCallerIndex(comp()->getCurrentInlinedSiteIndex());
// PHASE 1: Bytecode Iteration
bool callExists = false;
size = calltarget->_myCallSite->_isIndirectCall ? 5 : 0;
TR_J9ByteCode bc = bci.first(), nextBC;
#if defined(J9VM_OPT_JITSERVER)
if (comp()->isOutOfProcessCompilation())
{
// JITServer optimization:
// request this resolved method to create all of its callee resolved methods
// in a single query.
//
// If the method is unresolved, return NULL for 2 requests without asking the client,
// since they are called almost immediately after this request and are unlikely to
// become resolved.
//
// NOTE: first request occurs in the for loop over bytecodes, immediately after this request,
// second request occurs in InterpreterEmulator::findAndCreateCallsitesFromBytecodes
auto calleeMethod = static_cast<TR_ResolvedJ9JITServerMethod *>(calltarget->_calleeMethod);
calleeMethod->cacheResolvedMethodsCallees(2);
}
#endif /* defined(J9VM_OPT_JITSERVER) */
for (; bc != J9BCunknown; bc = bci.next())
{
nph.processByteCode();
TR_ResolvedMethod * resolvedMethod;
int32_t cpIndex;
bool isVolatile, isPrivate, isUnresolvedInCP, resolved;
TR::DataType type = TR::NoType;
void * staticAddress;
uint32_t fieldOffset;
newBCInfo.setByteCodeIndex(bci.bcIndex());
int32_t i = bci.bcIndex();
if (blockStart) //&& calltarget->_calleeSymbol)
{
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::bbStart);
blockStart = false;
foundNewAllocation = false;
}
if (bc == J9BCgenericReturn ||
bc == J9BCReturnC ||
bc == J9BCReturnS ||
bc == J9BCReturnB ||
bc == J9BCReturnZ)
{
if (!calltarget->_calleeMethod->isSynchronized())
size += 1;
else
size += bci.estimatedCodeSize();
}
else
size += bci.estimatedCodeSize();
switch (bc)
{
case J9BCificmpeq:
case J9BCificmpne:
case J9BCificmplt:
case J9BCificmpge:
case J9BCificmpgt:
case J9BCificmple:
case J9BCifacmpeq:
case J9BCifacmpne:
case J9BCifnull:
case J9BCifnonnull:
case J9BCifeq:
case J9BCifne:
case J9BCiflt:
case J9BCifge:
case J9BCifgt:
case J9BCifle:
case J9BCgoto:
case J9BCgotow:
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isBranch);
flags[i + bci.relativeBranch()].set(InterpreterEmulator::BytecodePropertyFlag::bbStart);
blockStart = true;
break;
case J9BCReturnC:
case J9BCReturnS:
case J9BCReturnB:
case J9BCReturnZ:
case J9BCgenericReturn:
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isBranch);
blockStart = true;
break;
case J9BCnew:
case J9BCnewarray:
case J9BCanewarray:
case J9BCmultianewarray:
if (calltarget->_calleeSymbol)
foundNewAllocation = true;
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
case J9BCathrow:
_foundThrow = true;
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isBranch);
blockStart = true;
if (!_aggressivelyInlineThrows)
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isCold);
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
case J9BCtableswitch:
{
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isBranch);
int32_t index = bci.defaultTargetIndex();
flags[i + bci.nextSwitchValue(index)].set(InterpreterEmulator::BytecodePropertyFlag::bbStart);
int32_t low = bci.nextSwitchValue(index);
int32_t high = bci.nextSwitchValue(index) - low + 1;
for (int32_t j = 0; j < high; ++j)
flags[i + bci.nextSwitchValue(index)].set(InterpreterEmulator::BytecodePropertyFlag::bbStart);
blockStart = true;
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
}
case J9BClookupswitch:
{
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isBranch);
int32_t index = bci.defaultTargetIndex();
flags[i + bci.nextSwitchValue(index)].set(InterpreterEmulator::BytecodePropertyFlag::bbStart);
int32_t tableSize = bci.nextSwitchValue(index);
for (int32_t j = 0; j < tableSize; ++j)
{
index += 4; // match value
flags[i + bci.nextSwitchValue(index)].set(InterpreterEmulator::BytecodePropertyFlag::bbStart);
}
blockStart = true;
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
}
case J9BCinvokevirtual:
{
if (thisOnStack)
hasThisCalls = true;
cpIndex = bci.next2Bytes();
auto calleeMethod = (TR_ResolvedJ9Method*)calltarget->_calleeMethod;
resolvedMethod = calleeMethod->getResolvedPossiblyPrivateVirtualMethod(comp(), cpIndex, true, &isUnresolvedInCP);
///if (!resolvedMethod || isUnresolvedInCP || resolvedMethod->isCold(comp(), true))
if ((isUnresolvedInCP && !resolvedMethod) || (resolvedMethod
&& resolvedMethod->isCold(comp(), true)))
{
if(tracer()->heuristicLevel())
{
if(resolvedMethod)
{
heuristicTrace(tracer(), "Depth %d: Call at bc index %d is Cold. Not searching for targets. Signature %s",_recursionDepth,i,tracer()->traceSignature(resolvedMethod));
}
else
{
TR::Method *meth = comp()->fej9()->createMethod(comp()->trMemory(), calltarget->_calleeMethod->containingClass(), cpIndex);
heuristicTrace(tracer(), "Depth %d: Call at bc index %d is Cold. Not searching for targets. Signature %s",_recursionDepth,i,tracer()->traceSignature(meth));
}
}
if (unresolvedSymbolsAreCold)
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isCold);
_isLeaf = false;
}
}
callExists = true;
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
case J9BCinvokespecial:
case J9BCinvokespecialsplit:
{
if (thisOnStack)
hasThisCalls = true;
cpIndex = bci.next2Bytes();
resolvedMethod = calltarget->_calleeMethod->getResolvedSpecialMethod(comp(), (bc == J9BCinvokespecialsplit)?cpIndex |= J9_SPECIAL_SPLIT_TABLE_INDEX_FLAG:cpIndex, &isUnresolvedInCP);
bool isIndirectCall = false;
bool isInterface = false;
TR::Method *interfaceMethod = 0;
TR::TreeTop *callNodeTreeTop = 0;
TR::Node *parent = 0;
TR::Node *callNode = 0;
TR::ResolvedMethodSymbol *resolvedSymbol = 0;
if (!resolvedMethod || isUnresolvedInCP || resolvedMethod->isCold(comp(), false))
{
if(tracer()->heuristicLevel())
{
if(resolvedMethod)
{
heuristicTrace(tracer(), "Depth %d: Call at bc index %d is Cold. Not searching for targets. Signature %s",_recursionDepth,i,tracer()->traceSignature(resolvedMethod));
}
else
{
if (bc == J9BCinvokespecialsplit)
cpIndex |= J9_SPECIAL_SPLIT_TABLE_INDEX_FLAG;
TR::Method *meth = comp()->fej9()->createMethod(comp()->trMemory(), calltarget->_calleeMethod->containingClass(), cpIndex);
heuristicTrace(tracer(), "Depth %d: Call at bc index %d is Cold. Not searching for targets. Signature %s",_recursionDepth,i,tracer()->traceSignature(meth));
}
}
if (unresolvedSymbolsAreCold)
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isCold);
_isLeaf = false;
}
}
callExists = true;
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
case J9BCinvokestatic:
case J9BCinvokestaticsplit:
{
cpIndex = bci.next2Bytes();
resolvedMethod = calltarget->_calleeMethod->getResolvedStaticMethod(comp(), (bc == J9BCinvokestaticsplit)?cpIndex |= J9_STATIC_SPLIT_TABLE_INDEX_FLAG:cpIndex, &isUnresolvedInCP);
bool isIndirectCall = false;
bool isInterface = false;
TR::Method *interfaceMethod = 0;
TR::TreeTop *callNodeTreeTop = 0;
TR::Node *parent = 0;
TR::Node *callNode = 0;
TR::ResolvedMethodSymbol *resolvedSymbol = 0;
if (!resolvedMethod || isUnresolvedInCP || resolvedMethod->isCold(comp(), false))
{
if (unresolvedSymbolsAreCold)
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isCold);
if(tracer()->heuristicLevel())
{
if(resolvedMethod)
heuristicTrace(tracer(), "Depth %d: Call at bc index %d is Cold. Not searching for targets. Signature %s",_recursionDepth,i,tracer()->traceSignature(resolvedMethod));
else
{
if (bc == J9BCinvokestaticsplit)
cpIndex |= J9_STATIC_SPLIT_TABLE_INDEX_FLAG;
TR::Method *meth = comp()->fej9()->createMethod(comp()->trMemory(), calltarget->_calleeMethod->containingClass(), cpIndex);
heuristicTrace(tracer(), "Depth %d: Call at bc index %d is Cold. Not searching for targets. Signature %s",_recursionDepth,i,tracer()->traceSignature(meth));
}
}
}
}
callExists = true;
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
case J9BCinvokeinterface:
cpIndex = bci.next2Bytes();
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
case J9BCgetfield:
resolved = calltarget->_calleeMethod->fieldAttributes(comp(), bci.next2Bytes(), &fieldOffset, &type, &isVolatile, 0, &isPrivate, false, &isUnresolvedInCP, false);
if (!resolved || isUnresolvedInCP)
{
if (unresolvedSymbolsAreCold)
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isCold);
if (!resolved)
_isLeaf = false;
}
if (isInExceptionRange(calltarget->_calleeMethod, i))
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
case J9BCputfield:
resolved = calltarget->_calleeMethod->fieldAttributes(comp(), bci.next2Bytes(), &fieldOffset, &type, &isVolatile, 0, &isPrivate, true, &isUnresolvedInCP, false);
if (!resolved || isUnresolvedInCP)
{
if (unresolvedSymbolsAreCold)
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isCold);
if (!resolved)
_isLeaf = false;
}
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
case J9BCgetstatic:
resolved = calltarget->_calleeMethod->staticAttributes(comp(), bci.next2Bytes(), &staticAddress, &type, &isVolatile, 0, &isPrivate, false, &isUnresolvedInCP, false);
if (!resolved || isUnresolvedInCP)
{
if (unresolvedSymbolsAreCold)
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isCold);
if (!resolved)
_isLeaf = false;
}
if (isInExceptionRange(calltarget->_calleeMethod, i))
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
case J9BCputstatic:
resolved = calltarget->_calleeMethod->staticAttributes(comp(), bci.next2Bytes(), &staticAddress, &type, &isVolatile, 0, &isPrivate, true, &isUnresolvedInCP, false);
if (!resolved || isUnresolvedInCP)
{
if (unresolvedSymbolsAreCold)
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isCold);
if (!resolved)
_isLeaf = false;
}
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
case J9BCaload0:
if (calltarget->_myCallSite->_isIndirectCall)
thisOnStack = true;
break;
case J9BCiastore:
case J9BClastore:
case J9BCfastore:
case J9BCdastore:
case J9BCaastore:
case J9BCbastore:
case J9BCcastore:
case J9BCsastore: //array stores can change the global state - hence unsanitizeable
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
case J9BCiaload:
case J9BClaload:
case J9BCfaload:
case J9BCdaload:
case J9BCaaload:
case J9BCbaload:
case J9BCcaload:
case J9BCsaload:
case J9BCarraylength: //array accesses are ok as long as we don't catch exception
case J9BCidiv:
case J9BCldiv:
case J9BCfdiv:
case J9BCddiv:
case J9BCirem:
case J9BClrem:
case J9BCfrem:
case J9BCdrem:
case J9BCcheckcast:
case J9BCinstanceof:
case J9BCasyncCheck:
if (isInExceptionRange(calltarget->_calleeMethod, i))
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
case J9BCinvokedynamic:
case J9BCinvokehandle:
case J9BCinvokehandlegeneric:
// TODO:JSR292: Use getResolvedHandleMethod
case J9BCmonitorenter:
case J9BCmonitorexit:
case J9BCunknown:
flags[i].set(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable);
break;
default:
break;
}
if (flags[i].testAny(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable))
debugTrace(tracer(),"BC at index %d is unsanitizeable.", i);
else if (flags[i].testAny(InterpreterEmulator::BytecodePropertyFlag::isCold))
debugTrace(tracer(),"BC at index %d is cold.", i);
else
debugTrace(tracer(),"BC iteration at index %d.", i); //only print this index if we are debugging
bcSizes[i] = size;
}
auto sizeBeforeAdjustment = size;
if (adjustEstimateForStringCompression(calltarget->_calleeMethod, size, STRING_COMPRESSION_ADJUSTMENT_FACTOR))
{
heuristicTrace(tracer(), "*** Depth %d: Adjusting size for %s because of string compression from %d to %d", _recursionDepth, callerName, sizeBeforeAdjustment, size);
}
if (adjustEstimateForMethodInvoke(calltarget->_calleeMethod, size, METHOD_INVOKE_ADJUSTMENT_FACTOR))
{
heuristicTrace(tracer(), "*** Depth %d: Adjusting size for %s because of java/lang/reflect/Method.invoke from %d to %d", _recursionDepth, callerName, sizeBeforeAdjustment, size);
}
calltarget->_fullSize = size;
if (calltarget->_calleeSymbol)
{
TR::DebugCounter::incStaticDebugCounter(comp(), TR::DebugCounter::debugCounterName(comp(), "inliner/%s/estimatedBytecodeSize/%d", calltarget->_calleeSymbol->signature(comp()->trMemory()), calltarget->_fullSize));
}
/********* PHASE 2: Generate CFG **********/
heuristicTrace(tracer(),"--- Done Iterating over Bytecodes in call to %s. size = %d _recursionDepth = %d _optimisticSize = %d _realSize = %d _sizeThreshold = %d",callerName, size, _recursionDepth, _optimisticSize, _realSize, _sizeThreshold);
if (hasThisCalls && calltarget->_calleeSymbol)
calltarget->_calleeSymbol->setHasThisCalls(true);
TR_Array<TR_J9ByteCodeIterator::TryCatchInfo> tryCatchInfo(
comp()->trMemory(),
calltarget->_calleeMethod->numberOfExceptionHandlers(), true,
stackAlloc);
int32_t i;
for (i = calltarget->_calleeMethod->numberOfExceptionHandlers() - 1; i
>= 0; --i)
{
int32_t start, end, type;
int32_t handler = calltarget->_calleeMethod->exceptionData(i, &start,
&end, &type);
flags[start].set(InterpreterEmulator::BytecodePropertyFlag::bbStart);
flags[end + 1].set(InterpreterEmulator::BytecodePropertyFlag::bbStart);
flags[handler].set(InterpreterEmulator::BytecodePropertyFlag::bbStart);
tryCatchInfo[i].initialize((uint16_t) start, (uint16_t) end,
(uint16_t) handler, (uint32_t) type);
}
calltarget->_cfg = new (cfgRegion) TR::CFG(comp(), calltarget->_calleeSymbol, cfgRegion);
TR::CFG &cfg = *(calltarget->_cfg);
cfg.setStartAndEnd(TR::Block::createBlock(
TR::TreeTop::create(comp(), TR::Node::create(NULL,
TR::BBStart, 0)), TR::TreeTop::create(comp(),
TR::Node::create(NULL, TR::BBEnd, 0)),
cfg), TR::Block::createBlock(
TR::TreeTop::create(comp(), TR::Node::create(NULL,
TR::BBStart, 0)), TR::TreeTop::create(comp(),
TR::Node::create(NULL, TR::BBEnd, 0)),
cfg));
cfg.getStart()->asBlock()->getEntry()->join(
cfg.getStart()->asBlock()->getExit());
cfg.getEnd()->asBlock()->getEntry()->join(
cfg.getEnd()->asBlock()->getExit());
cfg.getStart()->setNumber(cfg.getNextNodeNumber());
cfg.allocateNodeNumber();
cfg.getEnd()->setNumber(cfg.getNextNodeNumber());
cfg.allocateNodeNumber();
cfg.getEnd()->asBlock()->setIsEndBlock();
TR::Block * currentBlock = cfg.getStart()->asBlock();
currentBlock->setBlockBCIndex(0);
int32_t endNodeIndex = bci.maxByteCodeIndex() - 1;
if (endNodeIndex < 0)
{
debugTrace(tracer(), "MaxByteCodeIndex <= 0, setting BC index for end node to 0.");
endNodeIndex = 0;
}
setupNode(cfg.getStart()->asBlock()->getEntry()->getNode(), 0,
calltarget->_calleeMethod, comp());
setupNode(cfg.getStart()->asBlock()->getExit()->getNode(), 0,
calltarget->_calleeMethod, comp());
setupNode(cfg.getEnd()->asBlock()->getEntry()->getNode(),
endNodeIndex, calltarget->_calleeMethod, comp());
setupNode(cfg.getEnd()->asBlock()->getExit()->getNode(),
endNodeIndex, calltarget->_calleeMethod, comp());
debugTrace(tracer(),"PECS: startblock %p %d endblock %p %d",cfg.getStart()->asBlock(), cfg.getStart()->getNumber(), cfg.getEnd()->asBlock(), cfg.getEnd()->getNumber());
bool addFallThruEdge = true;
debugTrace(tracer(),"PECS: iterating over bc indexes in CFG creation. maxIndex =%d", maxIndex);
int32_t blockStartSize = 0;
int32_t startIndex = 0;
for (TR_J9ByteCode bc = bci.first(); bc != J9BCunknown; bc = bci.next())
{
int32_t i = bci.bcIndex();
if (flags[i].testAny(InterpreterEmulator::BytecodePropertyFlag::bbStart))
{
debugTrace(tracer(),"Calling getBlock. blocks[%d] = %p", i, blocks[i]);
TR::Block * newBlock = getBlock(comp(), blocks,
calltarget->_calleeMethod, i, cfg);
if (i != startIndex)
{
currentBlock->setBlockSize(bcSizes[i] - blockStartSize);
if (cfg.getMethodSymbol())
cfg.getMethodSymbol()->addProfilingOffsetInfo(currentBlock->getEntry()->getNode()->getByteCodeIndex(), currentBlock->getEntry()->getNode()->getByteCodeIndex() + currentBlock->getBlockSize());
}
if (addFallThruEdge)
{
debugTrace(tracer(),"adding a fallthrough edge between block %p %d and %p %d", currentBlock, currentBlock->getNumber(), newBlock, newBlock->getNumber());
debugTrace(tracer(),"joining nodes between blocks %p %d and %p %d", currentBlock, currentBlock->getNumber(), newBlock, newBlock->getNumber());
currentBlock->getExit()->join(newBlock->getEntry());
cfg.addEdge(currentBlock, newBlock);
}
else
{
addFallThruEdge = true;
}
currentBlock = newBlock;
startIndex = i;
blockStartSize = bcSizes[i];
}
if (flags[i].testAny(InterpreterEmulator::BytecodePropertyFlag::isCold))
{
partialTrace(tracer(), "Setting block %p[%d] blocks[%d]=%p as cold because bytecode %d was identified as cold",currentBlock, currentBlock->getNumber(), i, blocks[i], i);
currentBlock->setIsCold();
currentBlock->setFrequency(0);
}
if (flags[i].testAny(InterpreterEmulator::BytecodePropertyFlag::isUnsanitizeable))
{
partialTrace(tracer(), "Setting unsanitizeable flag on block %p[%d] blocks[%d]=%p",currentBlock, currentBlock->getNumber(), i, blocks[i]);
currentBlock->setIsUnsanitizeable();
}
if (flags[i].testAny(InterpreterEmulator::BytecodePropertyFlag::isBranch))
{
if (startIndex != i)
{
currentBlock->setBlockSize(bcSizes[i] - blockStartSize);
if (cfg.getMethodSymbol())
cfg.getMethodSymbol()->addProfilingOffsetInfo(currentBlock->getEntry()->getNode()->getByteCodeIndex(), currentBlock->getEntry()->getNode()->getByteCodeIndex() + currentBlock->getBlockSize());
}
else
{
currentBlock->setBlockSize(1); // if there startIndex is the same as the current index then the block consists only of a branch
if (cfg.getMethodSymbol())
cfg.getMethodSymbol()->addProfilingOffsetInfo(currentBlock->getEntry()->getNode()->getByteCodeIndex(), currentBlock->getEntry()->getNode()->getByteCodeIndex() + currentBlock->getBlockSize());
}
switch (bc)
{
case J9BCificmpeq:
case J9BCificmpne:
case J9BCificmplt:
case J9BCificmpge:
case J9BCificmpgt:
case J9BCificmple:
case J9BCifacmpeq:
case J9BCifacmpne:
case J9BCifeq:
case J9BCifne:
case J9BCiflt:
case J9BCifge:
case J9BCifgt:
case J9BCifle:
case J9BCifnull:
case J9BCifnonnull:
{
debugTrace(tracer(),"if branch.i = %d adding edge between blocks %p %d and %p %d",
i, currentBlock, currentBlock->getNumber(), getBlock(comp(), blocks, calltarget->_calleeMethod, i+ bci.relativeBranch(), cfg),
getBlock(comp(), blocks, calltarget->_calleeMethod, i + bci.relativeBranch(), cfg)->getNumber());
setupLastTreeTop(currentBlock, bc, i, getBlock(comp(), blocks, calltarget->_calleeMethod, i + bci.relativeBranch(), cfg), calltarget->_calleeMethod, comp());
cfg.addEdge(currentBlock, getBlock(comp(), blocks,
calltarget->_calleeMethod, i + bci.relativeBranch(),
cfg));
addFallThruEdge = true;
break;
}
case J9BCgoto: