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OMRMemoryReference.cpp
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OMRMemoryReference.cpp
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/*******************************************************************************
* Copyright (c) 2018, 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 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 "codegen/MemoryReference.hpp"
#include <stddef.h>
#include <stdint.h>
#include "codegen/ARM64Instruction.hpp"
#include "codegen/CodeGenerator.hpp"
#include "codegen/GenerateInstructions.hpp"
#include "codegen/Machine.hpp"
#include "codegen/Relocation.hpp"
#include "codegen/UnresolvedDataSnippet.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "il/StaticSymbol.hpp"
static void loadRelocatableConstant(TR::Node *node,
TR::SymbolReference *ref,
TR::Register *reg,
TR::MemoryReference *mr,
TR::CodeGenerator *cg)
{
TR::Compilation *comp = cg->comp();
TR::Symbol *symbol = ref->getSymbol();
bool isStatic = symbol->isStatic();
bool isStaticField = isStatic && (ref->getCPIndex() > 0) && !symbol->isClassObject();
bool isClass = isStatic && symbol->isClassObject();
bool isPicSite = isClass;
if (isPicSite && !cg->comp()->compileRelocatableCode()
&& cg->wantToPatchClassPointer((TR_OpaqueClassBlock*)symbol->getStaticSymbol()->getStaticAddress(), node))
{
TR_UNIMPLEMENTED();
return;
}
uintptr_t addr = symbol->isStatic() ? (uintptr_t)symbol->getStaticSymbol()->getStaticAddress() : (uintptr_t)symbol->getMethodSymbol()->getMethodAddress();
if (symbol->isStartPC())
{
generateTrg1ImmSymInstruction(cg, TR::InstOpCode::adr, node, reg, addr, symbol);
return;
}
if (ref->isUnresolved() || comp->compileRelocatableCode())
{
TR::Node *GCRnode = node;
if (!GCRnode)
GCRnode = cg->getCurrentEvaluationTreeTop()->getNode();
if (symbol->isCountForRecompile())
{
loadAddressConstant(cg, GCRnode, TR_CountForRecompile, reg, NULL, false, TR_GlobalValue);
}
else if (symbol->isRecompilationCounter())
{
loadAddressConstant(cg, GCRnode, 1, reg, NULL, false, TR_BodyInfoAddressLoad);
}
else if (symbol->isCompiledMethod())
{
loadAddressConstant(cg, GCRnode, 1, reg, NULL, false, TR_RamMethodSequence);
}
else if (isStaticField && !ref->isUnresolved())
{
loadAddressConstant(cg, GCRnode, 1, reg, NULL, false, TR_DataAddress);
}
else if (isClass && !ref->isUnresolved())
{
loadAddressConstant(cg, GCRnode, (intptr_t)ref, reg, NULL, false, TR_ClassAddress);
}
else
{
mr->setUnresolvedSnippet(new (cg->trHeapMemory()) TR::UnresolvedDataSnippet(cg, node, ref, node->getOpCode().isStore(), false));
cg->addSnippet(mr->getUnresolvedSnippet());
}
}
else
{
loadConstant64(cg, node, addr, reg);
}
}
OMR::ARM64::MemoryReference::MemoryReference(
TR::CodeGenerator *cg) :
_baseRegister(NULL),
_baseNode(NULL),
_indexRegister(NULL),
_indexNode(NULL),
_extraRegister(NULL),
_unresolvedSnippet(NULL),
_flag(0),
_scale(0)
{
_symbolReference = new (cg->trHeapMemory()) TR::SymbolReference(cg->comp()->getSymRefTab());
_offset = _symbolReference->getOffset();
}
OMR::ARM64::MemoryReference::MemoryReference(
TR::Register *br,
TR::Register *ir,
TR::CodeGenerator *cg) :
_baseRegister(br),
_baseNode(NULL),
_indexRegister(ir),
_indexNode(NULL),
_extraRegister(NULL),
_unresolvedSnippet(NULL),
_flag(0),
_scale(0)
{
_symbolReference = new (cg->trHeapMemory()) TR::SymbolReference(cg->comp()->getSymRefTab());
_offset = _symbolReference->getOffset();
}
OMR::ARM64::MemoryReference::MemoryReference(
TR::Register *br,
int32_t disp,
TR::CodeGenerator *cg) :
_baseRegister(br),
_baseNode(NULL),
_indexRegister(NULL),
_indexNode(NULL),
_extraRegister(NULL),
_unresolvedSnippet(NULL),
_flag(0),
_scale(0),
_offset(disp)
{
_symbolReference = new (cg->trHeapMemory()) TR::SymbolReference(cg->comp()->getSymRefTab());
}
OMR::ARM64::MemoryReference::MemoryReference(
TR::Node *rootLoadOrStore,
TR::CodeGenerator *cg) :
_baseRegister(NULL),
_baseNode(NULL),
_indexRegister(NULL),
_indexNode(NULL),
_extraRegister(NULL),
_unresolvedSnippet(NULL),
_flag(0),
_scale(0),
_offset(0),
_symbolReference(rootLoadOrStore->getSymbolReference())
{
TR::Compilation *comp = cg->comp();
TR::SymbolReference *ref = rootLoadOrStore->getSymbolReference();
TR::Symbol *symbol = ref->getSymbol();
bool isStore = rootLoadOrStore->getOpCode().isStore();
self()->setSymbol(symbol, cg);
if (rootLoadOrStore->getOpCode().isIndirect())
{
TR::Node *base = rootLoadOrStore->getFirstChild();
bool isLocalObject = ((base->getOpCodeValue() == TR::loadaddr) &&
base->getSymbol()->isLocalObject());
// Special case an indirect load or store off a local object. This
// can be treated as a direct load or store off the frame pointer
// We can't do this when the access is unresolved.
//
if (!ref->isUnresolved() && isLocalObject)
{
_baseRegister = cg->getStackPointerRegister();
_symbolReference = base->getSymbolReference();
_baseNode = base;
}
else
{
if (ref->isUnresolved())
{
// If it is an unresolved reference to a field of a local object
// then force the localobject address to be evaluated into a register
// otherwise the resolution may not work properly if the computation
// is folded away into a stack pointer + offset computation
if (isLocalObject)
cg->evaluate(base);
self()->setUnresolvedSnippet(new (cg->trHeapMemory()) TR::UnresolvedDataSnippet(cg, rootLoadOrStore, rootLoadOrStore->getSymbolReference(), isStore, false));
cg->addSnippet(self()->getUnresolvedSnippet());
}
// if an aconst feeds an aloadi, we need to load the constant
if (base->getOpCode().isLoadConst())
{
cg->evaluate(base);
}
if (symbol->isMethodMetaData())
{
_baseRegister = cg->getMethodMetaDataRegister();
}
self()->populateMemoryReference(rootLoadOrStore->getFirstChild(), cg);
}
}
else
{
if (symbol->isStatic())
{
if (ref->isUnresolved())
{
self()->setUnresolvedSnippet(new (cg->trHeapMemory()) TR::UnresolvedDataSnippet(cg, rootLoadOrStore, rootLoadOrStore->getSymbolReference(), isStore, false));
cg->addSnippet(self()->getUnresolvedSnippet());
}
else
{
_baseRegister = cg->allocateRegister();
self()->setBaseModifiable();
loadRelocatableConstant(rootLoadOrStore, ref, _baseRegister, self(), cg);
}
}
else
{
if (!symbol->isMethodMetaData())
{ // must be either auto or parm or error.
_baseRegister = cg->getStackPointerRegister();
}
else
{
_baseRegister = cg->getMethodMetaDataRegister();
}
}
}
self()->addToOffset(rootLoadOrStore, ref->getOffset(), cg);
}
OMR::ARM64::MemoryReference::MemoryReference(
TR::Node *node,
TR::SymbolReference *symRef,
TR::CodeGenerator *cg) :
_baseRegister(NULL),
_baseNode(NULL),
_indexRegister(NULL),
_indexNode(NULL),
_extraRegister(NULL),
_unresolvedSnippet(NULL),
_flag(0),
_scale(0),
_offset(0),
_symbolReference(symRef)
{
TR::Symbol *symbol = symRef->getSymbol();
if (symbol->isStatic())
{
if (symRef->isUnresolved())
{
self()->setUnresolvedSnippet(new (cg->trHeapMemory()) TR::UnresolvedDataSnippet(cg, node, symRef, false, false));
cg->addSnippet(self()->getUnresolvedSnippet());
}
else
{
_baseRegister = cg->allocateRegister();
self()->setBaseModifiable();
loadRelocatableConstant(node, symRef, _baseRegister, self(), cg);
}
}
if (symbol->isRegisterMappedSymbol())
{
if (!symbol->isMethodMetaData())
{ // must be either auto or parm or error.
_baseRegister = cg->getStackPointerRegister();
}
else
{
_baseRegister = cg->getMethodMetaDataRegister();
}
}
self()->setSymbol(symbol, cg);
self()->addToOffset(0, symRef->getOffset(), cg);
}
void OMR::ARM64::MemoryReference::setSymbol(TR::Symbol *symbol, TR::CodeGenerator *cg)
{
TR_ASSERT(_symbolReference->getSymbol()==NULL || _symbolReference->getSymbol()==symbol, "should not write to existing symbolReference");
_symbolReference->setSymbol(symbol);
if (_baseRegister != NULL && _indexRegister != NULL &&
(self()->hasDelayedOffset() || self()->getOffset(true) != 0))
{
self()->consolidateRegisters(NULL, NULL, false, cg);
}
}
void OMR::ARM64::MemoryReference::addToOffset(TR::Node *node, intptr_t amount, TR::CodeGenerator *cg)
{
if (self()->getUnresolvedSnippet() != NULL)
{
self()->setOffset(self()->getOffset() + amount);
return;
}
if (amount == 0)
{
return;
}
if (_baseRegister != NULL && _indexRegister != NULL)
{
self()->consolidateRegisters(NULL, NULL, false, cg);
}
intptr_t displacement = self()->getOffset() + amount;
if (!constantIsImm9(displacement))
{
TR::Register *newBase;
self()->setOffset(0);
if (_baseRegister && self()->isBaseModifiable())
newBase = _baseRegister;
else
{
newBase = cg->allocateRegister();
if (_baseRegister && _baseRegister->containsInternalPointer())
{
newBase->setContainsInternalPointer();
newBase->setPinningArrayPointer(_baseRegister->getPinningArrayPointer());
}
}
if (!node)
node = cg->getAppendInstruction()->getNode();
if (_baseRegister != NULL)
{
if (constantIsUnsignedImm12(displacement))
{
generateTrg1Src1ImmInstruction(cg, TR::InstOpCode::addimmx, node, newBase, _baseRegister, displacement);
}
else if (node->getOpCode().isLoadConst() && node->getRegister() && (node->getLongInt() == displacement))
{
generateTrg1Src2Instruction(cg, TR::InstOpCode::addx, node, newBase, _baseRegister, node->getRegister());
}
else
{
TR::Register *tempReg = cg->allocateRegister();
loadConstant64(cg, node, displacement, tempReg);
generateTrg1Src2Instruction(cg, TR::InstOpCode::addx, node, newBase, _baseRegister, tempReg);
cg->stopUsingRegister(tempReg);
}
}
else
{
loadConstant64(cg, node, displacement, newBase);
}
// the following "if" is just to avoid stopUsingRegister being called
// for newBase by decNodeReferenceCounts(cg);
if (_baseRegister == newBase && _baseNode == NULL) _baseRegister = NULL;
self()->decNodeReferenceCounts(cg);
_baseRegister = newBase;
_baseNode = NULL;
self()->setBaseModifiable();
}
else
self()->setOffset(displacement);
}
void OMR::ARM64::MemoryReference::decNodeReferenceCounts(TR::CodeGenerator *cg)
{
if (_baseRegister != NULL)
{
if (_baseNode != NULL)
cg->decReferenceCount(_baseNode);
else
cg->stopUsingRegister(_baseRegister);
}
if (_indexRegister != NULL)
{
if (_indexNode != NULL)
cg->decReferenceCount(_indexNode);
else
cg->stopUsingRegister(_indexRegister);
}
if (_extraRegister != NULL)
{
cg->stopUsingRegister(_extraRegister);
}
}
void OMR::ARM64::MemoryReference::populateMemoryReference(TR::Node *subTree, TR::CodeGenerator *cg)
{
if (cg->comp()->useCompressedPointers())
{
if (subTree->getOpCodeValue() == TR::l2a && subTree->getReferenceCount() == 1 && subTree->getRegister() == NULL)
{
cg->decReferenceCount(subTree);
subTree = subTree->getFirstChild();
}
}
if (subTree->getReferenceCount() > 1 || subTree->getRegister() != NULL)
{
if (_baseRegister != NULL)
{
self()->consolidateRegisters(cg->evaluate(subTree), subTree, false, cg);
}
else
{
_baseRegister = cg->evaluate(subTree);
_baseNode = subTree;
}
}
else
{
if (subTree->getOpCodeValue() == TR::aiadd ||
subTree->getOpCodeValue() == TR::iadd)
{
TR::Node *addressChild = subTree->getFirstChild();
TR::Node *integerChild = subTree->getSecondChild();
if (integerChild->getOpCode().isLoadConst())
{
self()->populateMemoryReference(addressChild, cg);
intptr_t amount = (integerChild->getOpCodeValue() == TR::iconst) ?
integerChild->getInt() : integerChild->getLongInt();
self()->addToOffset(integerChild, amount, cg);
cg->decReferenceCount(integerChild);
}
else if (integerChild->getEvaluationPriority(cg) > addressChild->getEvaluationPriority(cg))
{
self()->populateMemoryReference(integerChild, cg);
self()->populateMemoryReference(addressChild, cg);
}
else
{
self()->populateMemoryReference(addressChild, cg);
self()->populateMemoryReference(integerChild, cg);
}
}
else if (subTree->getOpCodeValue() == TR::ishl &&
subTree->getFirstChild()->getOpCode().isLoadConst() &&
subTree->getSecondChild()->getOpCode().isLoadConst())
{
self()->addToOffset(subTree, subTree->getFirstChild()->getInt() <<
subTree->getSecondChild()->getInt(), cg);
cg->decReferenceCount(subTree->getFirstChild());
cg->decReferenceCount(subTree->getSecondChild());
}
else if ((subTree->getOpCodeValue() == TR::loadaddr) && !cg->comp()->compileRelocatableCode())
{
TR::SymbolReference *ref = subTree->getSymbolReference();
TR::Symbol *symbol = ref->getSymbol();
_symbolReference = ref;
if (symbol->isStatic())
{
if (ref->isUnresolved())
{
self()->setUnresolvedSnippet(new (cg->trHeapMemory()) TR::UnresolvedDataSnippet(cg, subTree, ref, subTree->getOpCode().isStore(), false));
cg->addSnippet(self()->getUnresolvedSnippet());
}
else
{
_baseRegister = cg->allocateRegister();
_baseNode = NULL;
self()->setBaseModifiable();
loadRelocatableConstant(subTree, ref, _baseRegister, self(), cg);
}
}
if (symbol->isRegisterMappedSymbol())
{
if (_baseRegister != NULL)
{
TR::Register *tempReg;
if (!symbol->isMethodMetaData())
{ // must be either auto or parm or error.
tempReg = cg->getStackPointerRegister();
}
else
{
tempReg = cg->getMethodMetaDataRegister();
}
self()->consolidateRegisters(tempReg, NULL, false, cg);
}
else
{
if (!symbol->isMethodMetaData())
{ // must be either auto or parm or error.
_baseRegister = cg->getStackPointerRegister();
}
else
{
_baseRegister = cg->getMethodMetaDataRegister();
}
_baseNode = NULL;
}
}
self()->addToOffset(subTree, subTree->getSymbolReference()->getOffset(), cg);
cg->decReferenceCount(subTree); // need to decrement ref count because
// nodes weren't set on memoryreference
}
else if (subTree->getOpCodeValue() == TR::aconst ||
subTree->getOpCodeValue() == TR::iconst ||
subTree->getOpCodeValue() == TR::lconst)
{
intptr_t amount = (subTree->getOpCodeValue() == TR::iconst) ?
subTree->getInt() : subTree->getLongInt();
self()->addToOffset(subTree, amount, cg);
}
else
{
if (_baseRegister != NULL)
{
self()->consolidateRegisters(cg->evaluate(subTree), subTree, true, cg);
}
else
{
_baseRegister = cg->evaluate(subTree);
_baseNode = subTree;
self()->setBaseModifiable();
}
}
}
}
void OMR::ARM64::MemoryReference::consolidateRegisters(TR::Register *srcReg, TR::Node *srcTree, bool srcModifiable, TR::CodeGenerator *cg)
{
TR::Register *tempTargetRegister;
if (self()->getUnresolvedSnippet() != NULL)
{
TR_UNIMPLEMENTED();
}
else
{
if (_indexRegister != NULL)
{
if (self()->isBaseModifiable())
tempTargetRegister = _baseRegister;
else if (_baseRegister->containsCollectedReference() || _baseRegister->containsInternalPointer() ||
_indexRegister->containsCollectedReference() || _indexRegister->containsInternalPointer())
{
if (srcTree!=NULL && srcTree->isInternalPointer() &&
srcTree->getPinningArrayPointer())
{
tempTargetRegister = cg->allocateRegister();
tempTargetRegister->setContainsInternalPointer();
tempTargetRegister->setPinningArrayPointer(srcTree->getPinningArrayPointer());
}
else
{
tempTargetRegister = cg->allocateCollectedReferenceRegister();
}
}
else
tempTargetRegister = cg->allocateRegister();
generateTrg1Src2Instruction(cg, TR::InstOpCode::addx, srcTree, tempTargetRegister, _baseRegister, _indexRegister);
if (_baseRegister != tempTargetRegister)
{
self()->decNodeReferenceCounts(cg);
_baseNode = NULL;
}
else
{
if (_indexNode != NULL)
cg->decReferenceCount(_indexNode);
else
cg->stopUsingRegister(_indexRegister);
}
_baseRegister = tempTargetRegister;
self()->setBaseModifiable();
}
else if (srcReg != NULL && (self()->getOffset(true) != 0 || self()->hasDelayedOffset()))
{
if (self()->isBaseModifiable())
tempTargetRegister = _baseRegister;
else if (srcModifiable)
tempTargetRegister = srcReg;
else if (srcReg->containsCollectedReference() || srcReg->containsInternalPointer() ||
_baseRegister->containsCollectedReference() || _baseRegister->containsInternalPointer())
{
if (srcTree!=NULL && srcTree->isInternalPointer() &&
srcTree->getPinningArrayPointer())
{
tempTargetRegister = cg->allocateRegister();
tempTargetRegister->setContainsInternalPointer();
tempTargetRegister->setPinningArrayPointer(srcTree->getPinningArrayPointer());
}
else
{
tempTargetRegister = cg->allocateCollectedReferenceRegister();
}
}
else
tempTargetRegister = cg->allocateRegister();
generateTrg1Src2Instruction(cg, TR::InstOpCode::addx, srcTree, tempTargetRegister, _baseRegister, srcReg);
if (_baseRegister != tempTargetRegister)
{
self()->decNodeReferenceCounts(cg);
_baseNode = NULL;
}
if (srcReg == tempTargetRegister)
{
self()->decNodeReferenceCounts(cg);
_baseNode = srcTree;
}
else
{
if (srcTree != NULL)
cg->decReferenceCount(srcTree);
else
cg->stopUsingRegister(srcReg);
}
_baseRegister = tempTargetRegister;
self()->setBaseModifiable();
srcReg = NULL;
srcTree = NULL;
srcModifiable=false;
}
_indexRegister = srcReg;
_indexNode = srcTree;
if (srcModifiable)
self()->setIndexModifiable();
else
self()->clearIndexModifiable();
}
}
void OMR::ARM64::MemoryReference::bookKeepingRegisterUses(TR::Instruction *instr, TR::CodeGenerator *cg)
{
if (_baseRegister != NULL)
{
instr->useRegister(_baseRegister);
}
if (_indexRegister != NULL)
{
instr->useRegister(_indexRegister);
}
if (_extraRegister != NULL)
{
instr->useRegister(_extraRegister);
}
}
void OMR::ARM64::MemoryReference::assignRegisters(TR::Instruction *currentInstruction, TR::CodeGenerator *cg)
{
TR::Machine *machine = cg->machine();
TR::RealRegister *assignedBaseRegister;
TR::RealRegister *assignedIndexRegister;
if (_baseRegister != NULL)
{
assignedBaseRegister = _baseRegister->getAssignedRealRegister();
if (_indexRegister != NULL)
{
_indexRegister->block();
}
if (assignedBaseRegister == NULL)
{
if (_baseRegister->getTotalUseCount() == _baseRegister->getFutureUseCount())
{
if ((assignedBaseRegister = machine->findBestFreeRegister(currentInstruction, TR_GPR, true, _baseRegister)) == NULL)
{
assignedBaseRegister = machine->freeBestRegister(currentInstruction, _baseRegister);
}
}
else
{
assignedBaseRegister = machine->reverseSpillState(currentInstruction, _baseRegister);
}
_baseRegister->setAssignedRegister(assignedBaseRegister);
assignedBaseRegister->setAssignedRegister(_baseRegister);
assignedBaseRegister->setState(TR::RealRegister::Assigned);
}
if (_indexRegister != NULL)
{
_indexRegister->unblock();
}
}
if (_indexRegister != NULL)
{
if (_baseRegister != NULL)
{
_baseRegister->block();
}
assignedIndexRegister = _indexRegister->getAssignedRealRegister();
if (assignedIndexRegister == NULL)
{
if (_indexRegister->getTotalUseCount() == _indexRegister->getFutureUseCount())
{
if ((assignedIndexRegister = machine->findBestFreeRegister(currentInstruction, TR_GPR, false, _indexRegister)) == NULL)
{
assignedIndexRegister = machine->freeBestRegister(currentInstruction, _indexRegister);
}
}
else
{
assignedIndexRegister = machine->reverseSpillState(currentInstruction, _indexRegister);
}
_indexRegister->setAssignedRegister(assignedIndexRegister);
assignedIndexRegister->setAssignedRegister(_indexRegister);
assignedIndexRegister->setState(TR::RealRegister::Assigned);
}
if (_baseRegister != NULL)
{
_baseRegister->unblock();
}
}
if (_baseRegister != NULL)
{
machine->decFutureUseCountAndUnlatch(currentInstruction, _baseRegister);
_baseRegister = assignedBaseRegister;
}
if (_indexRegister != NULL)
{
machine->decFutureUseCountAndUnlatch(currentInstruction, _indexRegister);
_indexRegister = assignedIndexRegister;
}
if (self()->getUnresolvedSnippet() != NULL)
{
currentInstruction->ARM64NeedsGCMap(cg, 0xFFFFFFFF);
}
}
/* register offset */
static bool isRegisterOffsetInstruction(uint32_t enc)
{
return ((enc & 0x3b200c00) == 0x38200800);
}
/* post-index/pre-index/unscaled immediate offset */
static bool isImm9OffsetInstruction(uint32_t enc)
{
return ((enc & 0x3b200000) == 0x38000000);
}
/* unsigned immediate offset */
static bool isImm12OffsetInstruction(uint32_t enc)
{
return ((enc & 0x3b200000) == 0x39000000);
}
/* stp/ldp GPR */
static bool isImm7OffsetGPRInstruction(uint32_t enc)
{
return ((enc & 0x3e000000) == 0x28000000);
}
/* load/store exclusive */
static bool isExclusiveMemAccessInstruction(TR::InstOpCode::Mnemonic op)
{
return (op == TR::InstOpCode::ldxrx || op == TR::InstOpCode::ldxrw ||
op == TR::InstOpCode::ldaxrx || op == TR::InstOpCode::ldaxrw ||
op == TR::InstOpCode::stxrx || op == TR::InstOpCode::stxrw ||
op == TR::InstOpCode::stlxrx || op == TR::InstOpCode::stlxrw);
}
uint8_t *OMR::ARM64::MemoryReference::generateBinaryEncoding(TR::Instruction *currentInstruction, uint8_t *cursor, TR::CodeGenerator *cg)
{
uint32_t *wcursor = (uint32_t *)cursor;
TR::RealRegister *base = self()->getBaseRegister() ? toRealRegister(self()->getBaseRegister()) : NULL;
TR::RealRegister *index = self()->getIndexRegister() ? toRealRegister(self()->getIndexRegister()) : NULL;
if (self()->getUnresolvedSnippet())
{
TR_UNIMPLEMENTED();
}
else
{
int32_t displacement = self()->getOffset(true);
TR::InstOpCode op = currentInstruction->getOpCode();
if (op.getMnemonic() != TR::InstOpCode::addimmx)
{
// load/store instruction
uint32_t enc = (uint32_t)op.getOpCodeBinaryEncoding();
if (index)
{
TR_ASSERT(displacement == 0, "Non-zero offset with index register.");
if (isRegisterOffsetInstruction(enc))
{
base->setRegisterFieldRN(wcursor);
index->setRegisterFieldRM(wcursor);
if (self()->getScale() == 0)
{
// default: LSL #0
*wcursor |= 0x6 << 12;
}
else
{
// Eclipse OMR Issue #4227 tracks this
TR_UNIMPLEMENTED();
}
cursor += ARM64_INSTRUCTION_LENGTH;
}
else
{
TR_ASSERT_FATAL(false, "Unsupported instruction type.");
}
}
else
{
/* no index register */
base->setRegisterFieldRN(wcursor);
if (isImm9OffsetInstruction(enc))
{
if (constantIsImm9(displacement))
{
*wcursor |= (displacement & 0x1ff) << 12; /* imm9 */
cursor += ARM64_INSTRUCTION_LENGTH;
}
else
{
TR_ASSERT_FATAL(false, "Offset is too large for specified instruction.");
}
}
else if (isImm12OffsetInstruction(enc))
{
uint32_t size = (enc >> 30) & 3; /* b=0, h=1, w=2, x=3, q=0 */
uint32_t opc = (enc >> 22) & 3; /* 8bit, 16bit, 32bit, 64bit: 0 or 1; 128bit: 2 or 3 */
uint32_t bitsToShift;
if (opc == 2 || opc == 3)
{
bitsToShift = 4;
}
else if (opc == 0 || opc == 1)
{
bitsToShift = size;
}
else
{
TR_ASSERT_FATAL(false, "Instruction format is unknown.");
}
uint32_t shifted = displacement >> bitsToShift;
if (size > 0)
{
TR_ASSERT((displacement & ((1 << size) - 1)) == 0, "Non-aligned offset in 2/4/8-byte memory access.");
}
if (constantIsUnsignedImm12(shifted))
{
*wcursor |= (shifted & 0xfff) << 10; /* imm12 */
cursor += ARM64_INSTRUCTION_LENGTH;
}
else
{
if (op.getMnemonic() == TR::InstOpCode::ldrimmw && displacement < 0 && constantIsImm9(displacement))
{
*wcursor &= 0xFEFFFFFF; /* rewrite the instruction ldrimmw -> ldurw */
*wcursor |= (displacement & 0x1ff) << 12; /* imm9 */
cursor += ARM64_INSTRUCTION_LENGTH;
}
else
{
TR_ASSERT_FATAL(false, "Offset is too large for specified instruction.");
}
}
}
else if (isImm7OffsetGPRInstruction(enc))
{
uint32_t opc = ((enc >> 30) & 3); /* 32bit: 00, 64bit: 10 */
uint32_t size = ((opc >> 1) + 2);
uint32_t shifted = displacement >> size;
TR_ASSERT((displacement & ((1 << size) - 1)) == 0, "displacement must be 4/8-byte alligned");
if (constantIsImm7(shifted))
{
*wcursor |= (shifted & 0x7f) << 15; /* imm7 */
cursor += ARM64_INSTRUCTION_LENGTH;
}
else
{
TR_ASSERT_FATAL(false, "Offset is too large for specified instruction.");
}
}
else if (isExclusiveMemAccessInstruction(op.getMnemonic()))
{
TR_ASSERT(displacement == 0, "Offset must be zero for specified instruction.");
cursor += ARM64_INSTRUCTION_LENGTH;
}
else
{
/* Register pair, literal instructions to be supported */
TR_UNIMPLEMENTED();
}
}
}
else
{
// loadaddrEvaluator() uses addimmx in generateTrg1MemInstruction
TR_ASSERT(index == NULL, "MemoryReference with unexpected indexed form");
if (constantIsUnsignedImm12(displacement))
{
*wcursor |= (displacement & 0xfff) << 10; /* imm12 */
base->setRegisterFieldRN(wcursor);
cursor += ARM64_INSTRUCTION_LENGTH;
}
else
{
TR_ASSERT(currentInstruction->getKind() == OMR::Instruction::IsTrg1Mem, "unexpected instruction kind");
TR::RealRegister *treg = toRealRegister(((TR::ARM64Trg1MemInstruction *)currentInstruction)->getTargetRegister());
uint32_t lower = displacement & 0xffff;
uint32_t upper = (displacement >> 16) & 0xffff;
bool needSpill = (treg->getRegisterNumber() == base->getRegisterNumber());
TR::RealRegister *immreg;
TR::RealRegister *stackPtr;
if (needSpill)
{
immreg = cg->machine()->getRealRegister(
(base->getRegisterNumber() == TR::RealRegister::x12) ? TR::RealRegister::x11 : TR::RealRegister::x12
);
stackPtr = cg->getStackPointerRegister();
// stur immreg, [sp, -8]
*wcursor = TR::InstOpCode::getOpCodeBinaryEncoding(TR::InstOpCode::sturx) | (0x1F8 << 12);
immreg->setRegisterFieldRT(wcursor);
stackPtr->setRegisterFieldRN(wcursor);
wcursor++;
cursor += ARM64_INSTRUCTION_LENGTH;
}
else
{
immreg = treg;
}
// movzw immreg, low16bit
// movkw immreg, high16bit, LSL #16
// addx treg, basereg, immreg, SXTW
*wcursor = TR::InstOpCode::getOpCodeBinaryEncoding(TR::InstOpCode::movzw) | (lower << 5);
immreg->setRegisterFieldRD(wcursor);
wcursor++;
*wcursor = TR::InstOpCode::getOpCodeBinaryEncoding(TR::InstOpCode::movkw) | ((upper | TR::MOV_LSL16) << 5);
immreg->setRegisterFieldRD(wcursor);
wcursor++;
*wcursor = TR::InstOpCode::getOpCodeBinaryEncoding(TR::InstOpCode::addextx) | (TR::EXT_SXTW << 13);
base->setRegisterFieldRN(wcursor);
immreg->setRegisterFieldRM(wcursor);
treg->setRegisterFieldRD(wcursor);
wcursor++;
cursor += ARM64_INSTRUCTION_LENGTH * 3;
if (needSpill)
{
// ldur immreg, [sp, -8]
*wcursor = TR::InstOpCode::getOpCodeBinaryEncoding(TR::InstOpCode::ldurx) | (0x1F8 << 12);