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OMRTreeEvaluator.cpp
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OMRTreeEvaluator.cpp
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/*******************************************************************************
* Copyright (c) 2000, 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 http://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 <stdint.h>
#include "arm/codegen/ARMInstruction.hpp"
#include "arm/codegen/ARMOperand2.hpp"
#include "codegen/AheadOfTimeCompile.hpp"
#ifdef J9_PROJECT_SPECIFIC
#include "codegen/ARMAOTRelocation.hpp"
#include "compile/SymbolReferenceTable.hpp"
#include "codegen/CallSnippet.hpp"
#endif
#include "codegen/CodeGenerator.hpp"
#include "codegen/CodeGeneratorUtils.hpp"
#include "codegen/GenerateInstructions.hpp"
#include "codegen/Linkage.hpp"
#include "codegen/Linkage_inlines.hpp"
#include "codegen/RealRegister.hpp"
#include "codegen/Register.hpp"
#include "codegen/RegisterPair.hpp"
#include "codegen/TreeEvaluator.hpp"
#include "compile/VirtualGuard.hpp"
#include "env/jittypes.h"
#include "env/CompilerEnv.hpp"
#include "il/Block.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "il/ParameterSymbol.hpp"
#include "il/TreeTop.hpp"
#include "il/TreeTop_inlines.hpp"
#include "infra/Annotations.hpp"
#include "infra/Bit.hpp"
// Used in buildJNIDispatch in ARMLinkage.cpp for calculating the magic number
uint32_t findARMLoadConstantLength(int32_t value)
{
intParts localVal(value);
uint32_t bitValue = value, notBits = ~bitValue;
uint32_t bitTrailing = trailingZeroes(bitValue) & ~1;
uint32_t notTrailing = trailingZeroes(notBits) & ~1;
uint32_t base = bitValue>>bitTrailing;
uint32_t notBase = notBits>>notTrailing;
uint32_t result = 1;
if(((base & 0xFFFFFF00) == 0) || ((notBase & 0xFFFFFF00) == 0)) // is Immed8r || reversed immed8r
{
//result = 1;
}
else if((base & 0xFFFF0000) == 0) // 16bit Value
{
result = 2;
}
else if((notBase & 0xFFFF0000) == 0) // reversed 16bits
{
result = 3;
}
else if((base & 0xFF000000) == 0) // 24bit Value
{
result = 2;
if(((base >> 8) & 0x000000FF) != 0)
result = 3;
}
else
{
result = 4;
}
return result;
}
// PLEASE READ:
// The code to determine the number of instructions to use is reflected in findARMLoadConstantLength
// Please change the code there as well when making a change here
TR::Instruction *armLoadConstant(TR::Node *node, int32_t value, TR::Register *trgReg, TR::CodeGenerator *cg, TR::Instruction *cursor)
{
intParts localVal(value);
uint32_t bitValue = value, notBits = ~bitValue;
uint32_t bitTrailing = trailingZeroes(bitValue) & ~1;
uint32_t notTrailing = trailingZeroes(notBits) & ~1;
uint32_t base = bitValue>>bitTrailing;
uint32_t notBase = notBits>>notTrailing;
TR::Compilation *comp = cg->comp();
if (comp->getOption(TR_TraceCG))
{
traceMsg(comp, "In armLoadConstant with\n");
traceMsg(comp, "\tvalue = %d\n", value);
traceMsg(comp, "\tnotBits = %d\n", notBits);
traceMsg(comp, "\tbitTrailing = %d\n", bitTrailing);
traceMsg(comp, "\tnotTrailing = %d\n", notTrailing);
traceMsg(comp, "\tbase = %d\n", base);
traceMsg(comp, "\tnotBase = %d\n", notBase);
}
TR::Instruction *insertingInstructions = cursor;
if (cursor == NULL)
cursor = cg->getAppendInstruction();
// The straddled cases are not caught yet ...
if ((base & 0xFFFFFF00) == 0) // is Immed8r
{
if (bitTrailing == 32)
{
bitTrailing = 0;
}
cursor = generateTrg1ImmInstruction(cg, ARMOp_mov, node, trgReg, base & 0x000000FF, bitTrailing, cursor);
}
else if ((notBase & 0xFFFFFF00) == 0) // reversed immed8r
{
if (notTrailing == 32)
{
notTrailing = 0;
}
cursor = generateTrg1ImmInstruction(cg, ARMOp_mvn, node, trgReg, notBase & 0x000000FF, notTrailing, cursor);
}
else if ((base & 0xFFFF0000) == 0) // 16bit Value
{
cursor = generateTrg1ImmInstruction(cg, ARMOp_mov, node, trgReg, (base>>8) & 0x000000FF, 8 + bitTrailing, cursor);
cursor = generateTrg1Src1ImmInstruction(cg, ARMOp_add, node, trgReg, trgReg, base & 0x000000FF, bitTrailing, cursor);
}
else if ((notBase & 0xFFFF0000) == 0) // reversed 16bits
{
cursor = generateTrg1ImmInstruction(cg, ARMOp_mov, node, trgReg, (notBase>>8) & 0x000000FF, 8 + notTrailing, cursor);
cursor = generateTrg1Src1ImmInstruction(cg, ARMOp_add, node, trgReg, trgReg, notBase & 0x000000FF, notTrailing, cursor);
cursor = generateTrg1Src1Instruction(cg, ARMOp_mvn, node, trgReg, trgReg, cursor);
}
else if ((base & 0xFF000000) == 0) // 24bit Value
{
cursor = generateTrg1ImmInstruction(cg, ARMOp_mov, node, trgReg, (base>>16) & 0x000000FF, 16 + bitTrailing, cursor);
if (((base >> 8) & 0x000000FF) != 0)
cursor = generateTrg1Src1ImmInstruction(cg, ARMOp_add, node, trgReg, trgReg, (base>>8) & 0x000000FF, 8 + bitTrailing, cursor);
cursor = generateTrg1Src1ImmInstruction(cg, ARMOp_add, node, trgReg, trgReg, base & 0x000000FF, bitTrailing, cursor);
}
else
{
TR_ARMOperand2 *op2_3 = new (cg->trHeapMemory()) TR_ARMOperand2(localVal.getByte3(), 24);
TR_ARMOperand2 *op2_2 = new (cg->trHeapMemory()) TR_ARMOperand2(localVal.getByte2(), 16);
TR_ARMOperand2 *op2_1 = new (cg->trHeapMemory()) TR_ARMOperand2(localVal.getByte1(), 8);
TR_ARMOperand2 *op2_0 = new (cg->trHeapMemory()) TR_ARMOperand2(localVal.getByte0(), 0);
cursor = generateTrg1Src1Instruction(cg, ARMOp_mov, node, trgReg, op2_3, cursor);
cursor = generateTrg1Src2Instruction(cg, ARMOp_add, node, trgReg, trgReg, op2_2, cursor);
cursor = generateTrg1Src2Instruction(cg, ARMOp_add, node, trgReg, trgReg, op2_1, cursor);
cursor = generateTrg1Src2Instruction(cg, ARMOp_add, node, trgReg, trgReg, op2_0, cursor);
}
if (!insertingInstructions)
cg->setAppendInstruction(cursor);
return(cursor);
}
TR::Instruction *fixedSeqMemAccess(TR::CodeGenerator *cg, TR::Node *node, int32_t addr, TR::Instruction **nibbles, TR::Register *trgReg, TR::Instruction *cursor)
{
// Note: tempReg can be the same register as srcOrTrg. Caller needs to make sure it is right.
TR::Instruction *cursorCopy = cursor;
intParts localVal(addr);
TR::Compilation *comp = cg->comp();
if (cursor == NULL)
cursor = cg->getAppendInstruction();
TR_ARMOperand2 *op2_3 = new (cg->trHeapMemory()) TR_ARMOperand2(localVal.getByte3(), 24);
TR_ARMOperand2 *op2_2 = new (cg->trHeapMemory()) TR_ARMOperand2(localVal.getByte2(), 16);
TR_ARMOperand2 *op2_1 = new (cg->trHeapMemory()) TR_ARMOperand2(localVal.getByte1(), 8);
TR_ARMOperand2 *op2_0 = new (cg->trHeapMemory()) TR_ARMOperand2(localVal.getByte0(), 0);
nibbles[0] = cursor = generateTrg1Src1Instruction(cg, ARMOp_mov, node, trgReg, op2_3, cursor);
nibbles[1] = cursor = generateTrg1Src2Instruction(cg, ARMOp_add, node, trgReg, trgReg, op2_2, cursor);
nibbles[2] = cursor = generateTrg1Src2Instruction(cg, ARMOp_add, node, trgReg, trgReg, op2_1, cursor);
nibbles[3] = cursor = generateTrg1Src2Instruction(cg, ARMOp_add, node, trgReg, trgReg, op2_0, cursor);
TR::MemoryReference *memRef = new (cg->trHeapMemory()) TR::MemoryReference(trgReg, 0, sizeof(addr), cg);
nibbles[4] = cursor = generateTrg1MemInstruction(cg, ARMOp_ldr, node, trgReg, memRef, cursor);
if (cursorCopy == NULL)
cg->setAppendInstruction(cursor);
return cursor;
}
TR::Instruction *loadAddressConstantInSnippet(TR::CodeGenerator *cg, TR::Node * node, intptr_t address, TR::Register *trgReg, bool isUnloadablePicSite, TR::Instruction *cursor)
{
TR::Instruction *q[5];
TR::Instruction *c = fixedSeqMemAccess(cg, node, 0, q, trgReg, cursor);
cg->findOrCreateAddressConstant(&address, TR::Address, q[0], q[1], q[2], q[3], q[4], node, isUnloadablePicSite);
return c;
}
TR::Instruction *loadAddressConstantFixed(TR::CodeGenerator *cg, TR::Node * node, intptr_t value, TR::Register *trgReg, TR::Instruction *cursor, uint8_t *targetAddress, uint8_t *targetAddress2, int16_t typeAddress, bool doAOTRelocation)
{
TR::Compilation *comp = cg->comp();
bool isAOT = comp->compileRelocatableCode();
// load a 32-bit constant into a register with a fixed 4 instruction sequence
TR::Instruction *temp = cursor;
intParts localVal(value);
if (cursor == NULL)
cursor = cg->getAppendInstruction();
TR_ARMOperand2 *op2_3 = new (cg->trHeapMemory()) TR_ARMOperand2(localVal.getByte3(), 24);
TR_ARMOperand2 *op2_2 = new (cg->trHeapMemory()) TR_ARMOperand2(localVal.getByte2(), 16);
TR_ARMOperand2 *op2_1 = new (cg->trHeapMemory()) TR_ARMOperand2(localVal.getByte1(), 8);
TR_ARMOperand2 *op2_0 = new (cg->trHeapMemory()) TR_ARMOperand2(localVal.getByte0(), 0);
cursor = generateTrg1Src1Instruction(cg, ARMOp_mov, node, trgReg, op2_3, cursor);
if (value != 0x0)
{
#ifdef J9_PROJECT_SPECIFIC
TR_FixedSequenceKind seqKind = fixedSequence1;//does not matter
if (typeAddress == -1)
{
if (doAOTRelocation)
cg->addExternalRelocation(new (cg->trHeapMemory()) TR::BeforeBinaryEncodingExternalRelocation(
cursor,
(uint8_t *)value,
(uint8_t *)seqKind,
TR_FixedSequenceAddress2, cg),
__FILE__,
__LINE__,
node);
}
else
{
if (typeAddress == TR_DataAddress)
{
if (doAOTRelocation)
{
TR_RelocationRecordInformation *recordInfo = ( TR_RelocationRecordInformation *)comp->trMemory()->allocateMemory(sizeof( TR_RelocationRecordInformation), heapAlloc);
recordInfo->data1 = (uintptr_t)node->getSymbolReference();
recordInfo->data2 = (uintptr_t)node->getInlinedSiteIndex();
recordInfo->data3 = (uintptr_t)seqKind;
cg->addExternalRelocation(new (cg->trHeapMemory()) TR::BeforeBinaryEncodingExternalRelocation(
cursor,
(uint8_t *)recordInfo,
(TR_ExternalRelocationTargetKind)typeAddress, cg),
__FILE__,
__LINE__,
node);
}
}
else if ((typeAddress == TR_ClassAddress) || (typeAddress == TR_MethodObject))
{
if (doAOTRelocation)
{
TR_RelocationRecordInformation *recordInfo = ( TR_RelocationRecordInformation *)comp->trMemory()->allocateMemory(sizeof( TR_RelocationRecordInformation), heapAlloc);
recordInfo->data1 = (uintptr_t)targetAddress;
recordInfo->data2 = (uintptr_t)targetAddress2;
recordInfo->data3 = (uintptr_t)seqKind;
cg->addExternalRelocation(new (cg->trHeapMemory()) TR::BeforeBinaryEncodingExternalRelocation(
cursor,
(uint8_t *)recordInfo,
(TR_ExternalRelocationTargetKind)typeAddress, cg),
__FILE__,
__LINE__,
node);
}
}
else if (typeAddress == TR_ConstantPool)
{
if (doAOTRelocation)
{
cg->addExternalRelocation(new (cg->trHeapMemory()) TR::BeforeBinaryEncodingExternalRelocation(
cursor,
targetAddress,
targetAddress2,
(TR_ExternalRelocationTargetKind)typeAddress, cg),
__FILE__,
__LINE__,
node);
}
}
else
{
if (doAOTRelocation)
cg->addExternalRelocation(new (cg->trHeapMemory()) TR::BeforeBinaryEncodingExternalRelocation(
cursor,
(uint8_t *)value,
(uint8_t *)seqKind,
(TR_ExternalRelocationTargetKind)typeAddress, cg),
__FILE__,
__LINE__,
node);
}
}
#endif
}
cursor = generateTrg1Src2Instruction(cg, ARMOp_add, node, trgReg, trgReg, op2_2, cursor);
cursor = generateTrg1Src2Instruction(cg, ARMOp_add, node, trgReg, trgReg, op2_1, cursor);
cursor = generateTrg1Src2Instruction(cg, ARMOp_add, node, trgReg, trgReg, op2_0, cursor);
if (temp == NULL)
cg->setAppendInstruction(cursor);
return(cursor);
}
TR::Instruction *loadAddressConstant(TR::CodeGenerator *cg, TR::Node * node, intptr_t value, TR::Register *trgReg, TR::Instruction *cursor, bool isPicSite, int16_t typeAddress, uint8_t *targetAddress, uint8_t *targetAddress2)
{
if (cg->comp()->compileRelocatableCode())
return loadAddressConstantFixed(cg, node, value, trgReg, cursor, targetAddress, targetAddress2, typeAddress);
return armLoadConstant(node, value, trgReg, cg, cursor);
}
// also handles iiload
TR::Register *OMR::ARM::TreeEvaluator::iloadEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Register *tempReg;
bool needSync = (node->getSymbolReference()->getSymbol()->isSyncVolatile() && cg->comp()->target().isSMP());
tempReg = cg->allocateRegister();
if (node->getSymbolReference()->getSymbol()->isInternalPointer())
{
tempReg->setPinningArrayPointer(node->getSymbolReference()->getSymbol()->castToInternalPointerAutoSymbol()->getPinningArrayPointer());
tempReg->setContainsInternalPointer();
}
node->setRegister(tempReg);
TR::MemoryReference *tempMR = new (cg->trHeapMemory()) TR::MemoryReference(node, 4, cg);
generateTrg1MemInstruction(cg, ARMOp_ldr, node, tempReg, tempMR);
if (needSync && cg->comp()->target().cpu.id() != TR_DefaultARMProcessor)
{
generateInstruction(cg, (cg->comp()->target().cpu.id() == TR_ARMv6) ? ARMOp_dmb_v6 : ARMOp_dmb, node);
}
tempMR->decNodeReferenceCounts();
return tempReg;
}
static bool nodeIsNeeded(TR::Node *checkNode, TR::Node *node)
{
bool result = (checkNode->getOpCode().isCall() ||
(checkNode != node && (checkNode->getOpCodeValue() == TR::aloadi || checkNode->getOpCodeValue() == TR::aload)));
TR::Node *child = NULL;
for (uint16_t i = 0; i < checkNode->getNumChildren() && !result; i++)
{
child = checkNode->getChild(i);
if (child->getOpCode().isCall())
result = true;
// If the class ptr load is feeding anything other than a nullchk it's probably needed
else if (child == node && !checkNode->getOpCode().isNullCheck())
result = true;
else if (child != node && (child->getOpCodeValue() == TR::aloadi || child->getOpCodeValue() == TR::aload))
result = true;
else
result = nodeIsNeeded(child, node);
if (result || child == node)
break;
}
return result;
}
// handles aload and iaload
TR::Register *OMR::ARM::TreeEvaluator::aloadEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Compilation *comp = cg->comp();
// NEW to check for it feeding to a single vgdnop
static bool disableLoadForVGDNOP = (feGetEnv("TR_DisableLoadForVGDNOP") != NULL);
bool checkFeedingVGDNOP = !disableLoadForVGDNOP &&
node->getOpCodeValue() == TR::aloadi &&
node->getSymbolReference() &&
node->getReferenceCount() == 2 &&
!node->getSymbolReference()->isUnresolved() &&
node->getSymbolReference()->getSymbol()->getKind() == TR::Symbol::IsShadow;
if (OMR_UNLIKELY(checkFeedingVGDNOP))
{
TR::Node *topNode = cg->getCurrentEvaluationTreeTop()->getNode();
TR::SymbolReference *symRef = node->getSymbolReference();
int32_t index = symRef->getReferenceNumber();
int32_t numHelperSymbols = cg->symRefTab()->getNumHelperSymbols();
if (!nodeIsNeeded(topNode, node) &&
(comp->getSymRefTab()->isNonHelper(index, TR::SymbolReferenceTable::vftSymbol)) &&
topNode->getOpCodeValue() != TR::treetop && // side effects free
(!topNode->getOpCode().isNullCheck() || !topNode->getOpCode().isResolveCheck()))
{
// Search the current block for the feeding cmp to see
TR::TreeTop *tt = cg->getCurrentEvaluationTreeTop()->getNextTreeTop();
TR::Node *checkNode = NULL;
while (tt && (tt->getNode()->getOpCodeValue() != TR::BBEnd))
{
checkNode = tt->getNode();
if (cg->getSupportsVirtualGuardNOPing() &&
(checkNode->isNopableInlineGuard() || checkNode->isHCRGuard()) &&
(checkNode->getOpCodeValue() == TR::ificmpne || checkNode->getOpCodeValue() == TR::iflcmpne ||
checkNode->getOpCodeValue() == TR::ifacmpne) &&
checkNode->getFirstChild() == node)
{
// Try get the virtual guard
TR_VirtualGuard *virtualGuard = comp->findVirtualGuardInfo(checkNode);
if (!((comp->performVirtualGuardNOPing() || node->isHCRGuard()) &&
comp->isVirtualGuardNOPingRequired(virtualGuard)) &&
virtualGuard->canBeRemoved())
{
break;
}
else
{
if (!topNode->getOpCode().isNullCheck() && !topNode->getOpCode().isResolveCheck())
node->decReferenceCount();
cg->recursivelyDecReferenceCount(node->getFirstChild());
TR::Register *tempReg = cg->allocateRegister(); // Empty register
node->setRegister(tempReg);
return tempReg;
}
}
tt = tt->getNextTreeTop();
}
}
}
TR::Register *tempReg;
bool needSync = (node->getSymbolReference()->getSymbol()->isSyncVolatile() && cg->comp()->target().isSMP());
if (!node->getSymbolReference()->getSymbol()->isInternalPointer())
{
if (node->getSymbolReference()->getSymbol()->isNotCollected())
tempReg = cg->allocateRegister();
else
tempReg = cg->allocateCollectedReferenceRegister();
}
else
{
tempReg = cg->allocateRegister();
tempReg->setPinningArrayPointer(node->getSymbolReference()->getSymbol()->castToInternalPointerAutoSymbol()->getPinningArrayPointer());
tempReg->setContainsInternalPointer();
}
node->setRegister(tempReg);
TR::MemoryReference *tempMR = new (cg->trHeapMemory()) TR::MemoryReference(node, 4, cg);
generateTrg1MemInstruction(cg, ARMOp_ldr, node, tempReg, tempMR);
#ifdef J9_PROJECT_SPECIFIC
if (node->getSymbolReference() == cg->comp()->getSymRefTab()->findVftSymbolRef())
{
generateVFTMaskInstruction(cg, node, tempReg);
}
#endif
if (needSync && cg->comp()->target().cpu.id() != TR_DefaultARMProcessor)
{
generateInstruction(cg, (cg->comp()->target().cpu.id() == TR_ARMv6) ? ARMOp_dmb_v6 : ARMOp_dmb, node);
}
tempMR->decNodeReferenceCounts();
return tempReg;
}
// also handles ilload
TR::Register *OMR::ARM::TreeEvaluator::lloadEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Register *lowReg = cg->allocateRegister();
TR::Register *highReg = cg->allocateRegister();
TR::RegisterPair *trgReg = cg->allocateRegisterPair(lowReg, highReg);
TR::Compilation *comp = cg->comp();
bool bigEndian = cg->comp()->target().cpu.isBigEndian();
bool needSync = (node->getSymbolReference()->getSymbol()->isSyncVolatile() && cg->comp()->target().isSMP());
if (needSync && cg->comp()->target().cpu.id() != TR_DefaultARMProcessor)
{
TR::MemoryReference *tempMR = new (cg->trHeapMemory()) TR::MemoryReference(node, 8, cg);
TR::SymbolReference *vrlRef = comp->getSymRefTab()->findOrCreateVolatileReadLongSymbolRef(comp->getMethodSymbol());
generateTrg1MemInstruction(cg, ARMOp_add, node, bigEndian ? highReg: lowReg, tempMR);
TR::RegisterDependencyConditions *deps = new (cg->trHeapMemory()) TR::RegisterDependencyConditions(2, 2, cg->trMemory());
TR::addDependency(deps, lowReg, bigEndian ? TR::RealRegister::gr1 : TR::RealRegister::gr0, TR_GPR, cg);
TR::addDependency(deps, highReg, bigEndian ? TR::RealRegister::gr0 : TR::RealRegister::gr1, TR_GPR, cg);
generateImmSymInstruction(cg, ARMOp_bl,
node, (uintptr_t)vrlRef->getMethodAddress(),
deps,
vrlRef);
tempMR->decNodeReferenceCounts();
//deps->stopUsingDepRegs(cg, lowReg, highReg);
cg->machine()->setLinkRegisterKilled(true);
}
else
{
TR::MemoryReference *lowMR = new (cg->trHeapMemory()) TR::MemoryReference(node, 4, cg);
TR::MemoryReference *highMR = new (cg->trHeapMemory()) TR::MemoryReference(*lowMR, 4, 4, cg);
generateTrg1MemInstruction(cg, ARMOp_ldr, node, bigEndian ? highReg : lowReg, lowMR);
generateTrg1MemInstruction(cg, ARMOp_ldr, node, bigEndian ? lowReg : highReg, highMR);
lowMR->decNodeReferenceCounts();
}
node->setRegister(trgReg);
return trgReg;
}
// aloadEvaluator handled by iloadEvaluator
// also handles ibload
TR::Register *OMR::ARM::TreeEvaluator::bloadEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return commonLoadEvaluator(node, ARMOp_ldrsb, 1, cg);
}
// also handles isload
TR::Register *OMR::ARM::TreeEvaluator::sloadEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return commonLoadEvaluator(node, ARMOp_ldrsh, 2, cg);
}
// also handles icload
TR::Register *OMR::ARM::TreeEvaluator::cloadEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return commonLoadEvaluator(node, ARMOp_ldrh, 2, cg);
}
TR::Register *OMR::ARM::TreeEvaluator::commonLoadEvaluator(TR::Node *node, TR_ARMOpCodes memToRegOp, int32_t memSize, TR::CodeGenerator *cg)
{
TR::Register *tempReg = node->setRegister(cg->allocateRegister());
TR::MemoryReference *tempMR = new (cg->trHeapMemory()) TR::MemoryReference(node, memSize, cg);
bool needSync = (node->getSymbolReference()->getSymbol()->isSyncVolatile() && cg->comp()->target().isSMP());
generateTrg1MemInstruction(cg, memToRegOp, node, tempReg, tempMR);
if (needSync && cg->comp()->target().cpu.id() != TR_DefaultARMProcessor)
{
generateInstruction(cg, (cg->comp()->target().cpu.id() == TR_ARMv6) ? ARMOp_dmb_v6 : ARMOp_dmb, node);
}
tempMR->decNodeReferenceCounts();
return tempReg;
}
#if J9_PROJECT_SPECIFIC
TR::Register *OMR::ARM::TreeEvaluator::awrtbarEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::MemoryReference *tempMR = new (cg->trHeapMemory()) TR::MemoryReference(node, 4, cg);
TR::Register *destinationRegister = cg->evaluate(node->getSecondChild());
TR::Node *firstChild = node->getFirstChild();
TR::Register *sourceRegister;
bool killSource = false;
bool needSync = (node->getSymbolReference()->getSymbol()->isSyncVolatile() && cg->comp()->target().isSMP());
if (firstChild->getReferenceCount() > 1 && firstChild->getRegister() != NULL)
{
if (!firstChild->getRegister()->containsInternalPointer())
sourceRegister = cg->allocateCollectedReferenceRegister();
else
{
sourceRegister = cg->allocateRegister();
sourceRegister->setPinningArrayPointer(firstChild->getRegister()->getPinningArrayPointer());
sourceRegister->setContainsInternalPointer();
}
generateTrg1Src1Instruction(cg, ARMOp_mov, node, sourceRegister, firstChild->getRegister());
killSource = true;
}
else
sourceRegister = cg->evaluate(firstChild);
if (needSync && cg->comp()->target().cpu.id() != TR_DefaultARMProcessor)
{
generateInstruction(cg, (cg->comp()->target().cpu.id() == TR_ARMv6) ? ARMOp_dmb_v6 : ARMOp_dmb, node);
}
generateMemSrc1Instruction(cg, ARMOp_str, node, tempMR, sourceRegister);
VMwrtbarEvaluator(node, sourceRegister, destinationRegister, NULL, true, cg);
cg->machine()->setLinkRegisterKilled(true);
if (killSource)
cg->stopUsingRegister(sourceRegister);
cg->decReferenceCount(node->getFirstChild());
cg->decReferenceCount(node->getSecondChild());
tempMR->decNodeReferenceCounts();
return NULL;
}
TR::Register *OMR::ARM::TreeEvaluator::awrtbariEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::MemoryReference *tempMR = new (cg->trHeapMemory()) TR::MemoryReference(node, 4, cg);
TR::Register *destinationRegister = cg->evaluate(node->getChild(2));
TR::Node *secondChild = node->getSecondChild();
TR::Register *sourceRegister;
bool killSource = false;
bool needSync = (node->getSymbolReference()->getSymbol()->isSyncVolatile() && cg->comp()->target().isSMP());
/* comp->useCompressedPointers() is false for 32bit environment, leaving the compressed pointer support unimplemented. */
if (secondChild->getReferenceCount() > 1 && secondChild->getRegister() != NULL)
{
if (!secondChild->getRegister()->containsInternalPointer())
sourceRegister = cg->allocateCollectedReferenceRegister();
else
{
sourceRegister = cg->allocateRegister();
sourceRegister->setPinningArrayPointer(secondChild->getRegister()->getPinningArrayPointer());
sourceRegister->setContainsInternalPointer();
}
generateTrg1Src1Instruction(cg, ARMOp_mov, node, sourceRegister, secondChild->getRegister());
killSource = true;
}
else
sourceRegister = cg->evaluate(secondChild);
if (needSync && cg->comp()->target().cpu.id() != TR_DefaultARMProcessor)
{
generateInstruction(cg, (cg->comp()->target().cpu.id() == TR_ARMv6) ? ARMOp_dmb_v6 : ARMOp_dmb, node);
}
generateMemSrc1Instruction(cg, ARMOp_str, node, tempMR, sourceRegister);
VMwrtbarEvaluator(node, sourceRegister, destinationRegister, NULL, true, cg);
cg->machine()->setLinkRegisterKilled(true);
if (killSource)
cg->stopUsingRegister(sourceRegister);
cg->decReferenceCount(node->getSecondChild());
cg->decReferenceCount(node->getChild(2));
tempMR->decNodeReferenceCounts();
return NULL;
}
#endif
// also handles ilstore
TR::Register *OMR::ARM::TreeEvaluator::lstoreEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Node *valueChild;
TR::Compilation *comp = cg->comp();
if (node->getOpCode().isIndirect())
{
valueChild = node->getSecondChild();
}
else
{
valueChild = node->getFirstChild();
}
bool bigEndian = cg->comp()->target().cpu.isBigEndian();
bool needSync = (node->getSymbolReference()->getSymbol()->isSyncVolatile() && cg->comp()->target().isSMP());
TR::Register *valueReg = cg->evaluate(valueChild);
if (needSync && cg->comp()->target().cpu.id() != TR_DefaultARMProcessor)
{
TR::Register *addrReg = cg->allocateRegister();
TR::MemoryReference *tempMR = new (cg->trHeapMemory()) TR::MemoryReference(node, 8, cg);
TR::SymbolReference *vwlRef = comp->getSymRefTab()->findOrCreateVolatileWriteLongSymbolRef(comp->getMethodSymbol());
generateTrg1MemInstruction(cg, ARMOp_add, node, addrReg, tempMR);
TR::RegisterDependencyConditions *deps = new (cg->trHeapMemory()) TR::RegisterDependencyConditions(3, 3, cg->trMemory());
TR::addDependency(deps, addrReg, TR::RealRegister::gr0, TR_GPR, cg);
TR::addDependency(deps, valueReg->getLowOrder(), TR::RealRegister::gr1, TR_GPR, cg);
TR::addDependency(deps, valueReg->getHighOrder(), TR::RealRegister::gr2, TR_GPR, cg);
generateImmSymInstruction(cg, ARMOp_bl,
node, (uintptr_t)vwlRef->getMethodAddress(),
deps,
vwlRef);
tempMR->decNodeReferenceCounts();
//deps->stopUsingDepRegs(cg, valueReg->getLowOrder(), valueReg->getHighOrder());
cg->machine()->setLinkRegisterKilled(true);
}
else
{
TR::MemoryReference *lowMR = new (cg->trHeapMemory()) TR::MemoryReference(node, 4, cg);
TR::MemoryReference *highMR = new (cg->trHeapMemory()) TR::MemoryReference(*lowMR, 4, 4, cg);
if (bigEndian)
{
generateMemSrc1Instruction(cg, ARMOp_str, node, lowMR, valueReg->getHighOrder());
generateMemSrc1Instruction(cg, ARMOp_str, node, highMR, valueReg->getLowOrder());
}
else
{
generateMemSrc1Instruction(cg, ARMOp_str, node, lowMR, valueReg->getLowOrder());
generateMemSrc1Instruction(cg, ARMOp_str, node, highMR, valueReg->getHighOrder());
}
lowMR->decNodeReferenceCounts();
}
valueChild->decReferenceCount();
return NULL;
}
// also handles ibstore
TR::Register *OMR::ARM::TreeEvaluator::bstoreEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return commonStoreEvaluator(node, ARMOp_strb, 1, cg);
}
// also handles isstore, icstore,isstore,icstore
TR::Register *OMR::ARM::TreeEvaluator::sstoreEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return commonStoreEvaluator(node, ARMOp_strh, 2, cg);
}
// also handles astore, iastore, iistore
TR::Register *OMR::ARM::TreeEvaluator::istoreEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return commonStoreEvaluator(node, ARMOp_str, 4, cg);
}
TR::Register *OMR::ARM::TreeEvaluator::commonStoreEvaluator(TR::Node *node, TR_ARMOpCodes memToRegOp, int32_t memSize, TR::CodeGenerator *cg)
{
TR::MemoryReference *tempMR = new (cg->trHeapMemory()) TR::MemoryReference(node, memSize, cg);
bool needSync = (node->getSymbolReference()->getSymbol()->isSyncVolatile() && cg->comp()->target().isSMP());
TR::Node *valueChild;
if (node->getOpCode().isIndirect())
{
valueChild = node->getSecondChild();
}
else
{
valueChild = node->getFirstChild();
}
if (needSync && cg->comp()->target().cpu.id() != TR_DefaultARMProcessor)
{
generateInstruction(cg, (cg->comp()->target().cpu.id() == TR_ARMv6) ? ARMOp_dmb_v6 : ARMOp_dmb_st, node);
}
generateMemSrc1Instruction(cg, memToRegOp, node, tempMR, cg->evaluate(valueChild));
if (needSync && cg->comp()->target().cpu.id() != TR_DefaultARMProcessor)
{
generateInstruction(cg, (cg->comp()->target().cpu.id() == TR_ARMv6) ? ARMOp_dmb_v6 : ARMOp_dmb, node);
}
valueChild->decReferenceCount();
tempMR->decNodeReferenceCounts();
return NULL;
}
#ifdef J9_PROJECT_SPECIFIC
TR::Register *OMR::ARM::TreeEvaluator::monentEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return VMmonentEvaluator(node, cg);
}
TR::Register *OMR::ARM::TreeEvaluator::monexitEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return VMmonexitEvaluator(node, cg);
}
#endif
TR::Register *OMR::ARM::TreeEvaluator::integerHighestOneBit(TR::Node *node, TR::CodeGenerator *cg) { TR_UNIMPLEMENTED(); return NULL; }
TR::Register *OMR::ARM::TreeEvaluator::integerLowestOneBit(TR::Node *node, TR::CodeGenerator *cg) { TR_UNIMPLEMENTED(); return NULL; }
TR::Register *OMR::ARM::TreeEvaluator::integerNumberOfLeadingZeros(TR::Node *node, TR::CodeGenerator *cg) { TR_UNIMPLEMENTED(); return NULL; }
TR::Register *OMR::ARM::TreeEvaluator::integerNumberOfTrailingZeros(TR::Node *node, TR::CodeGenerator *cg) { TR_UNIMPLEMENTED(); return NULL; }
TR::Register *OMR::ARM::TreeEvaluator::integerBitCount(TR::Node *node, TR::CodeGenerator *cg) { TR_UNIMPLEMENTED(); return NULL; }
TR::Register *OMR::ARM::TreeEvaluator::longHighestOneBit(TR::Node *node, TR::CodeGenerator *cg) { TR_UNIMPLEMENTED(); return NULL; }
TR::Register *OMR::ARM::TreeEvaluator::longLowestOneBit(TR::Node *node, TR::CodeGenerator *cg) { TR_UNIMPLEMENTED(); return NULL; }
TR::Register *OMR::ARM::TreeEvaluator::longNumberOfLeadingZeros(TR::Node *node, TR::CodeGenerator *cg) { TR_UNIMPLEMENTED(); return NULL; }
TR::Register *OMR::ARM::TreeEvaluator::longNumberOfTrailingZeros(TR::Node *node, TR::CodeGenerator *cg) { TR_UNIMPLEMENTED(); return NULL; }
TR::Register *OMR::ARM::TreeEvaluator::longBitCount(TR::Node *node, TR::CodeGenerator *cg) { TR_UNIMPLEMENTED(); return NULL; }
TR::Register *OMR::ARM::TreeEvaluator::arraytranslateAndTestEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR_UNIMPLEMENTED();
return NULL;
}
TR::Register *OMR::ARM::TreeEvaluator::arraytranslateEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR_UNIMPLEMENTED();
return NULL;
}
TR::Register *OMR::ARM::TreeEvaluator::arraysetEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR_UNIMPLEMENTED();
return NULL;
}
TR::Register *OMR::ARM::TreeEvaluator::arraycmpEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR_UNIMPLEMENTED();
return NULL;
}
bool OMR::ARM::TreeEvaluator::stopUsingCopyReg(
TR::Node* node,
TR::Register*& reg,
TR::CodeGenerator* cg)
{
if (node != NULL)
{
reg = cg->evaluate(node);
if (!cg->canClobberNodesRegister(node))
{
TR::Register *copyReg;
if (reg->containsInternalPointer() ||
!reg->containsCollectedReference())
{
copyReg = cg->allocateRegister();
if (reg->containsInternalPointer())
{
copyReg->setPinningArrayPointer(reg->getPinningArrayPointer());
copyReg->setContainsInternalPointer();
}
}
else
copyReg = cg->allocateCollectedReferenceRegister();
generateTrg1Src1Instruction(cg, ARMOp_mov, node, copyReg, reg);
reg = copyReg;
return true;
}
}
return false;
}
static void constLengthArrayCopyEvaluator(TR::Node *node, int32_t byteLen, TR::Register *src, TR::Register *dst, TR::CodeGenerator *cg)
{
int32_t groups = byteLen >> 4;
int32_t residual=byteLen & 0x0000000F;
int32_t ri_x = 0, ri;
TR::Register *regs[4] = {NULL, NULL, NULL, NULL};
TR::RegisterDependencyConditions *deps = new (cg->trHeapMemory()) TR::RegisterDependencyConditions(7,7, cg->trMemory());
TR::addDependency(deps, src, TR::RealRegister::NoReg, TR_GPR, cg);
deps->getPreConditions()->getRegisterDependency(0)->setExcludeGPR0();
deps->getPostConditions()->getRegisterDependency(0)->setExcludeGPR0();
TR::addDependency(deps, dst, TR::RealRegister::NoReg, TR_GPR, cg);
deps->getPreConditions()->getRegisterDependency(1)->setExcludeGPR0();
deps->getPostConditions()->getRegisterDependency(1)->setExcludeGPR0();
if (byteLen == 0)
{
return;
}
regs[0] = cg->allocateRegister(TR_GPR); //as byteLen > 0 here, will need at least one register
TR::addDependency(deps, regs[0], TR::RealRegister::NoReg, TR_GPR, cg);
if (groups != 0)
{
regs[1] = cg->allocateRegister(TR_GPR);
regs[2] = cg->allocateRegister(TR_GPR);
regs[3] = cg->allocateRegister(TR_GPR);
TR::addDependency(deps, regs[1], TR::RealRegister::NoReg, TR_GPR, cg);
TR::addDependency(deps, regs[2], TR::RealRegister::NoReg, TR_GPR, cg);
TR::addDependency(deps, regs[3], TR::RealRegister::NoReg, TR_GPR, cg);
TR::Register *countReg = cg->allocateRegister();
if (groups <= UPPER_IMMED12)
generateTrg1ImmInstruction(cg, ARMOp_mov, node, countReg, groups, 0);
else
armLoadConstant(node, groups,countReg,cg);
TR::LabelSymbol *loopStart = TR::LabelSymbol::create(cg->trHeapMemory(),cg);
generateLabelInstruction(cg, ARMOp_label, node, loopStart);
for( ri = 0; ri < 4; ri++)
{
TR::MemoryReference *mr = new (cg->trHeapMemory()) TR::MemoryReference(src, 4*ri, cg);
// mr->setImmediatePreIndexed(); //store the base + offset back to the base reg
generateTrg1MemInstruction(cg, ARMOp_ldr, node, regs[ri], mr);
}
for( ri = 0; ri < 4; ri++)
{
TR::MemoryReference *mr = new (cg->trHeapMemory()) TR::MemoryReference(dst, 4*ri, cg);
// mr->setImmediatePreIndexed();
generateMemSrc1Instruction(cg, ARMOp_str, node, mr, regs[ri]);
}
generateTrg1Src1ImmInstruction(cg, ARMOp_add, node, src, src, 16, 0);
generateTrg1Src1ImmInstruction(cg, ARMOp_add, node, dst, dst, 16, 0);
generateTrg1Src1ImmInstruction(cg, ARMOp_sub_r, node, countReg, countReg, 1, 0);
generateConditionalBranchInstruction(cg, node, ARMConditionCodeNE, loopStart);
}
for ( ri = 0; ri < residual>>2; ri++)
{
//TR::Register *oneReg = regs[ri];
generateTrg1MemInstruction(cg, ARMOp_ldr, node, regs[0], new (cg->trHeapMemory()) TR::MemoryReference(src, 4*ri, cg));
generateMemSrc1Instruction(cg, ARMOp_str, node, new (cg->trHeapMemory()) TR::MemoryReference(dst, 4*ri, cg), regs[0]);
}
if(residual & 2)
{
generateTrg1MemInstruction(cg, ARMOp_ldrh, node, regs[0], new (cg->trHeapMemory()) TR::MemoryReference(src, 4*ri, cg));
generateMemSrc1Instruction(cg, ARMOp_strh, node, new (cg->trHeapMemory()) TR::MemoryReference(dst, 4*ri, cg), regs[0]);
ri++;
ri_x = 2;
}
if(residual & 1)
{
generateTrg1MemInstruction(cg, ARMOp_ldrb, node, regs[0], new (cg->trHeapMemory()) TR::MemoryReference(src, (4*ri)+ri_x, cg));
generateMemSrc1Instruction(cg, ARMOp_strb, node, new (cg->trHeapMemory()) TR::MemoryReference(dst, (4*ri)+ri_x, cg), regs[0]);
}
return;
}
TR::Register *OMR::ARM::TreeEvaluator::arraycopyEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Node *srcObjNode, *dstObjNode, *srcAddrNode, *dstAddrNode, *lengthNode;
TR::Register *srcObjReg=NULL, *dstObjReg=NULL, *srcAddrReg, *dstAddrReg, *lengthReg;
bool stopUsingCopyReg1, stopUsingCopyReg2, stopUsingCopyReg3, stopUsingCopyReg4, stopUsingCopyReg5 = false;
TR::SymbolReference *arrayCopyHelper;
FILE *outFile;
bool isSimpleCopy = (node->getNumChildren() == 3);
if (isSimpleCopy)
{
srcObjNode = NULL;
dstObjNode = NULL;
srcAddrNode = node->getChild(0);
dstAddrNode = node->getChild(1);
lengthNode = node->getChild(2);
}
else
{
srcObjNode = node->getChild(0);
dstObjNode = node->getChild(1);
srcAddrNode = node->getChild(2);
dstAddrNode = node->getChild(3);
lengthNode = node->getChild(4);
}
stopUsingCopyReg1 = stopUsingCopyReg(srcObjNode, srcObjReg, cg);
stopUsingCopyReg2 = stopUsingCopyReg(dstObjNode, dstObjReg, cg);
stopUsingCopyReg3 = stopUsingCopyReg(srcAddrNode, srcAddrReg, cg);
stopUsingCopyReg4 = stopUsingCopyReg(dstAddrNode, dstAddrReg, cg);
lengthReg = cg->evaluate(lengthNode);
if (!cg->canClobberNodesRegister(lengthNode))
{
TR::Register *lenCopyReg = cg->allocateRegister();
generateTrg1Src1Instruction(cg, ARMOp_mov, node, lenCopyReg, lengthReg);
lengthReg = lenCopyReg;
stopUsingCopyReg5 = true;
}
TR::RegisterDependencyConditions *deps = new (cg->trHeapMemory()) TR::RegisterDependencyConditions(3,3, cg->trMemory());
// Build up the dependency conditions
// r0 is length in bytes, r1 is srcAddr, r2 is dstAddr
TR::addDependency(deps, lengthReg, TR::RealRegister::gr0, TR_GPR, cg);
TR::addDependency(deps, srcAddrReg, TR::RealRegister::gr1, TR_GPR, cg);
TR::addDependency(deps, dstAddrReg, TR::RealRegister::gr2, TR_GPR, cg);
arrayCopyHelper = cg->symRefTab()->findOrCreateRuntimeHelper(TR_ARMarrayCopy, false, false, false);
generateImmSymInstruction(cg, ARMOp_bl,
node, (uintptr_t)arrayCopyHelper->getMethodAddress(),
deps,
arrayCopyHelper);
#ifdef J9_PROJECT_SPECIFIC
if (!isSimpleCopy)
{
TR::TreeEvaluator::genWrtbarForArrayCopy(node, srcObjReg, dstObjReg, cg);
}
#endif
if (srcObjNode != NULL)
cg->decReferenceCount(srcObjNode);
if (dstObjNode != NULL)
cg->decReferenceCount(dstObjNode);
cg->decReferenceCount(srcAddrNode);
cg->decReferenceCount(dstAddrNode);
cg->decReferenceCount(lengthNode);
if (stopUsingCopyReg1)
cg->stopUsingRegister(srcObjReg);
if (stopUsingCopyReg2)
cg->stopUsingRegister(dstObjReg);
if (stopUsingCopyReg3)
cg->stopUsingRegister(srcAddrReg);
if (stopUsingCopyReg4)
cg->stopUsingRegister(dstAddrReg);
cg->machine()->setLinkRegisterKilled(true);
cg->setHasCall();
return NULL;
}
TR::Register *OMR::ARM::TreeEvaluator::asynccheckEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
// The child contains an inline test. If it succeeds, the helper is called.
// The address of the helper is contained as an int in this node.
//