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OMRBlock.hpp
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OMRBlock.hpp
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/*******************************************************************************
* Copyright (c) 2000, 2019 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
*******************************************************************************/
#ifndef OMR_BLOCK_INCL
#define OMR_BLOCK_INCL
/*
* The following #define and typedef must appear before any #includes in this file
*/
#ifndef OMR_BLOCK_CONNECTOR
#define OMR_BLOCK_CONNECTOR
namespace OMR { class Block; }
namespace OMR { typedef OMR::Block BlockConnector; }
#endif
#define MIN_PROFILED_FREQUENCY (.75f)
#include "infra/CfgNode.hpp"
#include <limits.h>
#include <stddef.h>
#include <stdint.h>
#include "compile/Compilation.hpp"
#include "env/TRMemory.hpp"
#include "env/jittypes.h"
#include "il/Node.hpp"
#include "infra/Annotations.hpp"
#include "infra/Assert.hpp"
#include "infra/Cfg.hpp"
#include "infra/Flags.hpp"
#include "infra/Link.hpp"
#include "infra/List.hpp"
#include "optimizer/Optimizer.hpp"
class TR_BitVector;
class TR_BlockStructure;
class TR_Debug;
class TR_GlobalRegister;
class TR_GlobalRegisterAllocator;
class TR_Memory;
class TR_RegionStructure;
class TR_RegisterCandidate;
class TR_RegisterCandidates;
class TR_ResolvedMethod;
namespace TR { class Block; }
namespace TR { class CFGEdge; }
namespace TR { class CFGNode; }
namespace TR { class DebugCounterAggregation; }
namespace TR { class Instruction; }
namespace TR { class Symbol; }
namespace TR { class TreeTop; }
template <class T> class TR_Array;
// Pseudo-safe downcast from a CFG node to a TR::Block
//
static inline TR::Block *toBlock(TR::CFGNode *node)
{
#if DEBUG
if (node != NULL)
{
TR_ASSERT(node->asBlock() != NULL, "Bad downcast from TR::CFGNode to TR::Block");
}
#endif
return (TR::Block *)node;
}
namespace OMR
{
/**
* Order of Blocks:
* There are two types of orders for blocks, CFG and textual order.
* CFG (Control flow graph) orders the block in a control flow manner.
* Textual order is just a linear order of blocks. It does not represent the control flow.
* --> At any given point during compilation, the code compiled is represented by a linked list of treetops, which are broken up into blocks.
* --> And this is the textual order
*
* To traverse blocks in CFG order, use getSuccessors(), getPredecessors()
* To traverse blocks in textual order, use getNextBlock(), getPrevBlock()
*
*/
class OMR_EXTENSIBLE Block : public TR::CFGNode
{
public:
/// Downcast to concrete type
TR::Block * self();
Block(TR_Memory * m);
Block(TR::CFG &cfg);
/// Create a block with the given entry and exit.
Block(TR::TreeTop *entry, TR::TreeTop *exit, TR_Memory * m);
Block(TR::TreeTop *entry, TR::TreeTop *exit, TR::CFG &cfg);
/// Copy Constructor.
///
/// Uses the same memory as `other`
Block(TR::Block &other, TR::TreeTop *entry, TR::TreeTop *exit);
~Block()
{
TR_ASSERT(0,"blocks should not be freed until the destructor is updated to also free the catch block extension");
// Currently blocks are allocated on the heap and we never free them.
// In the future, if we start freeing blocks, we should update
// ensureCatchBlockExtensionExists to allocate the catch block extension
// somewhere other than the heap, and then free _catchBlockExtension here
// if it is not null.
}
virtual const char * getName(TR_Debug *);
static TR::Block * createBlock(TR::TreeTop *entry, TR::TreeTop *exit, TR::CFG &cfg);
static TR::Block * createEmptyBlock(TR::Node *, TR::Compilation *, int32_t frequency = -1, TR::Block *block = NULL);
static TR::Block * createEmptyBlock(TR::Compilation *comp, int32_t frequency = -1, TR::Block *block = NULL);
TR::Block *breakFallThrough(TR::Compilation *comp, TR::Block *faller, TR::Block *fallee);
static void insertBlockAsFallThrough(TR::Compilation *comp, TR::Block *block, TR::Block *newFallThroughBlock);
static void redirectFlowToNewDestination(TR::Compilation *comp, TR::CFGEdge *origEdge, TR::Block *newTo, bool useGotoForFallThrough);
virtual TR::Block *asBlock();
// return the first treetop in the block, skipping past any fences
TR::TreeTop * getFirstRealTreeTop();
// return the treetop before the exit, skipping past any fences
TR::TreeTop * getLastRealTreeTop();
// returns the treetop before any [un]conditional goto, return, etc.
TR::TreeTop * getLastNonControlFlowTreeTop();
int32_t getNumberOfRealTreeTops();
/// getNextBlock and getPrevBlock return the next/previous block in the "textual" orders of blocks
TR::Block * getNextBlock();
TR::Block * getPrevBlock();
TR::Block * getNextExtendedBlock();
// append a node under a treetop and before the bbend
TR::TreeTop *append(TR::TreeTop * tt);
// preppend a node under a treetop immediately after the bbStart
TR::TreeTop * prepend(TR::TreeTop * tt);
TR::Block * split(TR::TreeTop * startOfNewBlock, TR::CFG * cfg, bool fixupCommoning = false, bool copyExceptionSuccessors = true, TR::ResolvedMethodSymbol *methodSymbol = NULL);
TR::Block * splitPostGRA(TR::TreeTop *startOfNewBlock, TR::CFG *cfg, bool copyExceptionSuccessors = true, TR::ResolvedMethodSymbol *methodSymbol = NULL);
TR::Block * splitWithGivenMethodSymbol(TR::ResolvedMethodSymbol *methodSymbol, TR::TreeTop * startOfNewBlock, TR::CFG * cfg, bool fixupCommoning = false, bool copyExceptionSuccessors = true);
TR::Block *createConditionalSideExitBeforeTree(TR::TreeTop *tree,
TR::TreeTop *compareTree,
TR::TreeTop *exitTree,
TR::TreeTop *returnTree,
TR::CFG *cfg,
bool markCold = true);
TR::Block * createConditionalBlocksBeforeTree(TR::TreeTop* tree,
TR::TreeTop* compareTree,
TR::TreeTop* ifTree,
TR::TreeTop* elseTree,
TR::CFG* cfg,
bool changeBlockExtensions = true,
bool markCold = true);
TR::Block * splitEdge(TR::Block *, TR::Block *, TR::Compilation *, TR::TreeTop **lastTreeTop = NULL, bool findOptimalInsertionPoint = true);
virtual void removeFromCFG(TR::Compilation *);
// remove the branch treetop from the block as well as the associated branch edge.
// removeBranch assumes the last nonfence node is a branch.
//
void removeBranch(TR::Compilation *);
void takeGlRegDeps(TR::Compilation *comp, TR::Node *glRegDeps);
TR::Block * findVirtualGuardBlock( TR::CFG *cfg);
TR_RegionStructure *getParentStructureIfExists( TR::CFG *);
TR_RegionStructure *getCommonParentStructureIfExists(TR::Block *, TR::CFG *);
void inheritBlockInfo(TR::Block * org, bool inheritFreq = true);
bool isTargetOfJumpWhoseTargetCanBeChanged(TR::Compilation * comp);
static int32_t getMaxColdFrequency(TR::Block *b1, TR::Block *b2);
static int32_t getMinColdFrequency(TR::Block *b1, TR::Block *b2);
static int32_t getScaledSpecializedFrequency(int32_t fastFrequency);
TR::Block * startOfExtendedBlock();
// change the target of the branch in the block, add an edge to the new block,
// remove the edge from the previous destination block and update any GlRegDep Nodes
//
void changeBranchDestination(TR::TreeTop * newDestination, TR::CFG *cfg, bool callerFixesRegdeps = false);
TR::Node * findFirstReference(TR::Symbol * sym, vcount_t visitCount);
void collectReferencedAutoSymRefsIn(TR::Compilation *comp, TR_BitVector *, vcount_t);
void collectReferencedAutoSymRefsIn(TR::Compilation *comp, TR::Node *, TR_BitVector *, vcount_t);
// Map for which standard exceptions can be caught by this (catch) block
//
enum
{
CanCatchNullCheck = 0x00000001,
CanCatchResolveCheck = 0x00000002,
CanCatchDivCheck = 0x00000004,
CanCatchBoundCheck = 0x00000008,
CanCatchArrayStoreCheck = 0x00000010,
CanCatchCheckCast = 0x00000020,
CanCatchNew = 0x00000040,
CanCatchArrayNew = 0x00000080,
CanCatchMonitorExit = 0x00000100,
CanCatchUserThrows = 0x00000200,
CanCatchOSR = 0x00000400,
CanCatchOverflowCheck = 0x00000800,
CanCatchEverything = 0x000007FF, // Mask for all of the above
};
bool canCatchExceptions(uint32_t flags); // uses the above enum
bool canFallThroughToNextBlock();
bool doesNotNeedLabelAtStart();
TR::CFGEdge * getFallThroughEdgeInEBB();
void setByteCodeIndex(int32_t index, TR::Compilation *comp);
bool endsInGoto();
bool isGotoBlock(TR::Compilation * comp, bool allowPrecedingSnapshots=false);
bool endsInBranch();
bool isEmptyBlock();
TR::TreeTop *getExceptingTree();
bool hasExceptionPredecessors();
bool hasExceptionSuccessors();
/**
* Field functions
*/
TR::TreeTop *getEntry() { return _pEntry; }
TR::TreeTop *setEntry(TR::TreeTop *p)
{
if (TR::comp()->getOptimizer() && !TR::comp()->isPeekingMethod())
{
TR::comp()->getOptimizer()->setCachedExtendedBBInfoValid(false);
}
return (_pEntry = p);
}
TR::TreeTop *getExit() { return _pExit; }
TR::TreeTop *setExit(TR::TreeTop *p)
{
if (TR::comp()->getOptimizer() && !TR::comp()->isPeekingMethod())
{
TR::comp()->getOptimizer()->setCachedExtendedBBInfoValid(false);
}
return (_pExit = p);
}
TR_BitVector *getLiveLocals() { return _liveLocals; }
TR_BitVector *setLiveLocals(TR_BitVector* v) { return (_liveLocals = v); }
TR_BlockStructure *getStructureOf() { return _pStructureOf; }
TR_BlockStructure *setStructureOf(TR_BlockStructure *p) { return (_pStructureOf = p); }
int32_t getNestingDepth();
TR_Array<TR_GlobalRegister> & getGlobalRegisters(TR::Compilation *);
void clearGlobalRegisters() { _globalRegisters = NULL; }
struct InstructionBoundaries : TR_Link<InstructionBoundaries>
{
InstructionBoundaries(uint32_t s = UINT_MAX, uint32_t e = UINT_MAX) : _startPC(s), _endPC(e) { }
uint32_t _startPC;
uint32_t _endPC;
};
void setInstructionBoundaries(uint32_t startPC, uint32_t endPC);
InstructionBoundaries & getInstructionBoundaries() { return _instructionBoundaries; }
void addExceptionRangeForSnippet(uint32_t startPC, uint32_t endPC);
InstructionBoundaries * getFirstSnippetBoundaries() { return _snippetBoundaries.getFirst(); }
TR::Instruction *getFirstInstruction() { return _firstInstruction; }
TR::Instruction *setFirstInstruction(TR::Instruction *i) { return (_firstInstruction = i); }
TR::Instruction *getLastInstruction() { return _lastInstruction; }
TR::Instruction *setLastInstruction(TR::Instruction *i) { return (_lastInstruction = i); }
class TR_CatchBlockExtension
{
public:
TR_ALLOC(TR_Memory::CatchBlockExtension)
TR_CatchBlockExtension()
: _exceptionClass(NULL), _exceptionClassNameChars(NULL), _exceptionClassNameLength(0),
_catchType(0), _exceptionsCaught(0), _handlerIndex(0), _inlineDepth(0), _owningMethod(NULL), _isSyntheticHandler(false) {}
TR_CatchBlockExtension(TR_CatchBlockExtension &other)
: _exceptionClass(other._exceptionClass), _exceptionClassNameChars(other._exceptionClassNameChars),
_exceptionClassNameLength(other._exceptionClassNameLength), _catchType(other._catchType),
_exceptionsCaught(other._exceptionsCaught), _handlerIndex(other._handlerIndex),
_inlineDepth(other._inlineDepth), _owningMethod(other._owningMethod), _byteCodeInfo(other._byteCodeInfo), _isSyntheticHandler(other._isSyntheticHandler){}
TR_OpaqueClassBlock * _exceptionClass;
char * _exceptionClassNameChars;
int32_t _exceptionClassNameLength;
uint32_t _exceptionsCaught;
uint32_t _catchType;
TR_ResolvedMethod * _owningMethod;
TR_ByteCodeInfo _byteCodeInfo;
uint16_t _handlerIndex;
uint8_t _inlineDepth;
bool _isSyntheticHandler; // indicate whether the exception handler is inserted by the compiler rather than existing in the source code
};
TR_CatchBlockExtension* getCatchBlockExtension() { return _catchBlockExtension; }
void setCatchBlockExtension(TR_CatchBlockExtension *extension) { _catchBlockExtension = extension; }
void setHandlerInfo(uint32_t c, uint8_t d, uint16_t i, TR_ResolvedMethod * m, TR::Compilation *comp);
void setHandlerInfoWithOutBCInfo(uint32_t c, uint8_t d, uint16_t i, TR_ResolvedMethod * m, TR::Compilation *comp); //also used for estimatecodesize dummy blocks
bool isCatchBlock();
uint32_t getCatchType();
uint8_t getInlineDepth();
uint16_t getHandlerIndex();
TR_ByteCodeInfo getByteCodeInfo();
TR_OpaqueClassBlock * getExceptionClass();
char * getExceptionClassNameChars();
int32_t getExceptionClassNameLength();
void setExceptionClassName(char *c, int32_t length, TR::Compilation *comp);
TR_ResolvedMethod * getOwningMethod();
void setUnrollFactor(int factor) { _unrollFactor = factor; }
uint16_t getUnrollFactor() { return _unrollFactor; }
void setBlockSize(int32_t s) { _blockSize = s; }
int32_t getBlockSize() { return _blockSize; }
// TODO: These access members that are only used in J9EstimateCodeSize and
// should be deleted when the members are moved out.
void setBlockBCIndex(int32_t len) { _blockBCIndex = len; }
int32_t getBlockBCIndex() { return _blockBCIndex; }
void setJ9EstimateCodeSizeMethod(TR_ResolvedMethod *m) { _j9EstimateSizeMethod = m; }
TR_ResolvedMethod *getJ9EstimateCodeSizeMethod() { return _j9EstimateSizeMethod; }
TR::DebugCounterAggregation *getDebugCounters() { return _debugCounters; }
void setDebugCounters(TR::DebugCounterAggregation *debugCounters) { _debugCounters = debugCounters; }
// getNormalizedFrequency returns a value between 0 and 100. getGlobalNormalizedFrequency multiplies the
// normalizedfrequency by 10 for hot methods and by 100 for scorching methods.
//
int32_t getNormalizedFrequency(TR::CFG *);
int32_t getGlobalNormalizedFrequency(TR::CFG *);
bool verifyOSRInduceBlock(TR::Compilation *);
/**
* Field functions end
*/
/**
* Flag functions
*/
void setIsExtensionOfPreviousBlock(bool b = true);
bool isExtensionOfPreviousBlock();
void setIsCold(bool b = true) { _flags.set(_isCold, b); }
bool isCold() { return _flags.testAny(_isCold); }
void setIsSuperCold(bool v = true);
bool isSuperCold();
void setDoNotProfile() { _flags.set(_doNotProfile); }
bool doNotProfile() { return _flags.testAny(_doNotProfile); }
void setSpecializedDesyncCatchBlock() { _flags.set(_specializedDesyncCatchBlock); }
bool specializedDesyncCatchBlock() { return _flags.testAny(_specializedDesyncCatchBlock); }
void setFirstBlockInLoop() { _flags.set(_firstBlockInLoop); }
bool firstBlockInLoop() { return _flags.testAny(_firstBlockInLoop); }
void setBranchesBackwards() { _flags.set(_branchingBackwards); }
bool branchesBackwards() { return _flags.testAny(_branchingBackwards); }
void setIsSynchronizedHandler() { _flags.set(_isSynchronizedHandler); }
bool isSynchronizedHandler() { return _flags.testAny(_isSynchronizedHandler); }
void setIsPRECandidate(bool b) { _flags.set(_isPRECandidate, b); }
bool isPRECandidate() { return _flags.testAny(_isPRECandidate); }
void setIsAdded() { _flags.set(_isAdded); }
bool isAdded() { return _flags.testAny(_isAdded); }
void setIsOSRInduceBlock() { _flags.set(_isOSRInduceBlock); }
bool isOSRInduceBlock() { return _flags.testAny(_isOSRInduceBlock); }
void setIsOSRCodeBlock() { _flags.set(_isOSRCodeBlock); }
bool isOSRCodeBlock() { return _flags.testAny(_isOSRCodeBlock); }
void setIsOSRCatchBlock() { _flags.set(_isOSRCatchBlock); }
bool isOSRCatchBlock() { return _flags.testAny(_isOSRCatchBlock); }
void setIsCreatedAtCodeGen(bool b = true) { _flags.set(_createdAtCodeGen, b); }
bool isCreatedAtCodeGen() { return _flags.testAny(_createdAtCodeGen); }
void setHasCalls(bool b) { _flags.set(_hasCalls, b); }
bool hasCalls() { return _flags.testAny(_hasCalls); }
void setHasCallToSuperCold(bool b) { _flags.set(_hasCallToSuperCold, b); }
bool hasCallToSuperCold() { return _flags.testAny(_hasCallToSuperCold); }
void setIsSpecialized(bool b = true) { _flags.set(_isSpecialized, b); }
bool isSpecialized() { return _flags.testAny(_isSpecialized); }
bool isLoopInvariantBlock() { return _flags.testAny(_isLoopInvariantBlock); }
void setAsLoopInvariantBlock(bool b) { _flags.set(_isLoopInvariantBlock, b); }
bool isCreatedByVersioning() { return _flags.testAny(_isCreatedByVersioning); }
void setCreatedByVersioning(bool b) { _flags.set(_isCreatedByVersioning, b); }
bool isEntryOfShortRunningLoop() { return _flags.testAny(_isEntryOfShortRunningLoop); }
void setIsEntryOfShortRunningLoop() { _flags.set(_isEntryOfShortRunningLoop, true); }
bool wasHeaderOfCanonicalizedLoop() { return _flags.testAny(_wasHeaderOfCanonicalizedLoop); }
void setWasHeaderOfCanonicalizedLoop(bool b) { _flags.set(_wasHeaderOfCanonicalizedLoop, b); }
bool isSyntheticHandler() { return _catchBlockExtension && _catchBlockExtension->_isSyntheticHandler; }
void setIsSyntheticHandler();
enum partialFlags // Stored in lowest 8 bits of _moreflags
{
_unsanitizeable = 0x00000001,
_containsCall = 0x00000002,
_restartBlock = 0x00000004,
_partialInlineBlock = 0x00000008,
_endBlock = 0x00000010,
_difficultBlock = 0x00000020,
// Available = 0x00000040,
// Available = 0x00000080
};
flags16_t getPartialFlags() {return flags16_t(_moreflags.getValue(0xFF));} // J9
void setIsUnsanitizeable(bool b = true) { _moreflags.set(_unsanitizeable,b); } // J9
bool isUnsanitizeable() { return _moreflags.testAny(_unsanitizeable); }
void setContainsCall(bool b = true) { _moreflags.set(_containsCall,b); }
bool containsCall() { return _moreflags.testAny(_containsCall); }
void setRestartBlock(bool b = true) { _moreflags.set(_restartBlock,b); } // J9
bool isRestartBlock() { return _moreflags.testAny(_restartBlock); }
void setPartialInlineBlock(bool b = true) { _moreflags.set(_partialInlineBlock,b); }
bool isPartialInlineBlock() { return _moreflags.testAny(_partialInlineBlock); }
void setIsEndBlock(bool b = true) { _moreflags.set(_endBlock,b); }
bool isEndBlock() { return _moreflags.testAny(_endBlock); }
void setIsDifficultBlock(bool b = true) { _moreflags.set(_difficultBlock,b); }
bool isDifficultBlock() { return _moreflags.testAny(_difficultBlock); }
/**
* Flag functions end
*/
private:
void init(TR::TreeTop *entry, TR::TreeTop *exit);
void uncommonNodesBetweenBlocks(TR::Compilation *, TR::Block *, TR::ResolvedMethodSymbol *methodSymbol = NULL);
TR::Block * splitBlockAndAddConditional(TR::TreeTop *tree,
TR::TreeTop *compareTree,
TR::CFG *cfg,
bool newBlockShouldExtend);
void ensureCatchBlockExtensionExists(TR::Compilation *comp);
struct StandardException
{
int32_t length;
char *name;
uint32_t exceptions;
};
static StandardException _standardExceptions[];
static StandardException _valueTypesExceptions[];
enum // flag bits for _flags
{
_isExtensionOfPreviousBlock = 0x00000001,
_isCold = 0x00000002,
_isSuperCold = 0x00040000, // User specified cold/hotness by pragma or @ASSERT for PLX
// AVAILABLE = 0x00000080,
_doNotProfile = 0x00000004,
_specializedDesyncCatchBlock = 0x00000008,
_firstBlockInLoop = 0x00000020,
_branchingBackwards = 0x00000040,
_isSynchronizedHandler = 0x00000100,
// Available = 0x00000400,
_isPRECandidate = 0x00000800,
_isAdded = 0x00001000,
_isOSRInduceBlock = 0x00002000,
_isOSRCodeBlock = 0x00004000,
_isOSRCatchBlock = 0x00008000,
_createdAtCodeGen = 0x00080000,
_hasCalls = 0x00200000,
_hasCallToSuperCold = 0x00400000,
_isSpecialized = 0x00800000, // Block has been specialized by loop specializer
_isLoopInvariantBlock = 0x01000000,
_isCreatedByVersioning = 0x02000000,
_isEntryOfShortRunningLoop = 0x04000000,
_wasHeaderOfCanonicalizedLoop = 0x08000000,
};
TR::TreeTop * _pEntry;
TR::TreeTop * _pExit;
TR_BitVector * _liveLocals;
TR_BlockStructure * _pStructureOf;
// TODO: This member is only used during GRA and should be moved out.
TR_Array<TR_GlobalRegister> * _globalRegisters;
InstructionBoundaries _instructionBoundaries;
TR_LinkHead<InstructionBoundaries> _snippetBoundaries;
TR::Instruction * _firstInstruction;
TR::Instruction * _lastInstruction;
TR_CatchBlockExtension * _catchBlockExtension;
uint16_t _unrollFactor;
// TODO: These members are only used in J9EstimateCodeSize and should be moved out.
int32_t _blockSize;
int32_t _blockBCIndex;
TR_ResolvedMethod * _j9EstimateSizeMethod;
TR::DebugCounterAggregation * _debugCounters;
flags32_t _flags;
flags32_t _moreflags;
};
}
struct BlockMapper : TR_Link<BlockMapper>
{
BlockMapper(TR::Block * f, TR::Block * t) : _from(f), _to(t) { }
TR::Block * _from;
TR::Block * _to;
};
class TR_BlockCloner
{
public:
TR_ALLOC(TR_Memory::BlockCloner)
TR_BlockCloner( TR::CFG * cfg, bool cloneBranchesExactly = false, bool cloneSuccessorsOfLastBlock = false)
: _cfg(cfg),
_cloneBranchesExactly(cloneBranchesExactly),
_cloneSuccessorsOfLastBlock(cloneSuccessorsOfLastBlock)
{ }
TR::Block * cloneBlocks(TR::Block * firstBlock, TR::Block * lastBlock);
TR::Block * cloneBlocks(TR_LinkHeadAndTail<BlockMapper>* bMap);
TR::Block * getLastClonedBlock() { return _lastToBlock; }
TR::Block * getToBlock(TR::Block *);
void replaceTrees(TR::TreeTop *);
private:
TR::Node * cloneNode(TR::Node *);
TR::Block * doBlockClone(TR_LinkHeadAndTail<BlockMapper>* bMap);
TR::CFG * _cfg;
TR::Block * _lastToBlock;
TR_LinkHeadAndTail<BlockMapper> _blockMappings;
TR_NodeMappings _nodeMappings;
bool _cloneBranchesExactly;
bool _cloneSuccessorsOfLastBlock;
};
class TR_ExtendedBlockSuccessorIterator
{
public:
TR_ALLOC(TR_Memory::ExtendedBlockSuccessorIterator)
TR_ExtendedBlockSuccessorIterator(TR::Block * b, TR::CFG *cfg)
: _firstBlock(b), _cfg(cfg)
{ }
TR::Block * getFirst();
TR::Block * getNext();
private:
void setCurrentBlock(TR::Block * b);
TR::Block * _firstBlock;
TR::Block * _nextBlockInExtendedBlock;
TR::CFG * _cfg;
TR::CFGEdgeList::iterator _iterator;
TR::CFGEdgeList* _list;
};
#endif