#include "llvm/CodeGen/MachineLoopInfo.h"

Inheritance diagram for llvm::MachineLoopInfo:

[legend]

Public Types
using	iterator = LoopInfoBase< MachineBasicBlock, MachineLoop >::iterator
	The iterator interface to the top-level loops in the current function.

Public Member Functions
	MachineLoopInfo ()

	MachineLoopInfo (MachineDominatorTree &MDT)

	MachineLoopInfo (const MachineLoopInfo &)=delete

MachineLoopInfo &	operator= (const MachineLoopInfo &)=delete

LoopInfoBase< MachineBasicBlock, MachineLoop > &	getBase ()

MachineBasicBlock *	findLoopPreheader (MachineLoop *L, bool SpeculativePreheader=false, bool FindMultiLoopPreheader=false) const
	Find the block that either is the loop preheader, or could speculatively be used as the preheader.

iterator	begin () const

iterator	end () const

bool	empty () const

MachineLoop *	getLoopFor (const MachineBasicBlock *BB) const
	Return the innermost loop that BB lives in.

const MachineLoop *	operator[] (const MachineBasicBlock *BB) const
	Same as getLoopFor.

unsigned	getLoopDepth (const MachineBasicBlock *BB) const
	Return the loop nesting level of the specified block.

bool	isLoopHeader (const MachineBasicBlock *BB) const
	True if the block is a loop header node.

bool	runOnMachineFunction (MachineFunction &F) override
	Calculate the natural loop information.

void	calculate (MachineDominatorTree &MDT)

void	releaseMemory () override
	releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memory when it is no longer needed.

void	getAnalysisUsage (AnalysisUsage &AU) const override
	getAnalysisUsage - Subclasses that override getAnalysisUsage must call this.

MachineLoop *	removeLoop (iterator I)
	This removes the specified top-level loop from this loop info object.

void	changeLoopFor (MachineBasicBlock BB, MachineLoop L)
	Change the top-level loop that contains BB to the specified loop.

void	changeTopLevelLoop (MachineLoop OldLoop, MachineLoop NewLoop)
	Replace the specified loop in the top-level loops list with the indicated loop.

void	addTopLevelLoop (MachineLoop *New)
	This adds the specified loop to the collection of top-level loops.

void	removeBlock (MachineBasicBlock *BB)
	This method completely removes BB from all data structures, including all of the Loop objects it is nested in and our mapping from MachineBasicBlocks to loops.

Public Member Functions inherited from llvm::MachineFunctionPass
bool	doInitialization (Module &) override
	doInitialization - Virtual method overridden by subclasses to do any necessary initialization before any pass is run.

Public Member Functions inherited from llvm::FunctionPass
	FunctionPass (char &pid)

Pass *	createPrinterPass (raw_ostream &OS, const std::string &Banner) const override
	createPrinterPass - Get a function printer pass.

virtual bool	runOnFunction (Function &F)=0
	runOnFunction - Virtual method overriden by subclasses to do the per-function processing of the pass.

void	assignPassManager (PMStack &PMS, PassManagerType T) override
	Find appropriate Function Pass Manager or Call Graph Pass Manager in the PM Stack and add self into that manager.

PassManagerType	getPotentialPassManagerType () const override
	Return what kind of Pass Manager can manage this pass.

Public Member Functions inherited from llvm::Pass
	Pass (PassKind K, char &pid)

	Pass (const Pass &)=delete

Pass &	operator= (const Pass &)=delete

virtual	~Pass ()

PassKind	getPassKind () const

virtual StringRef	getPassName () const
	getPassName - Return a nice clean name for a pass.

AnalysisID	getPassID () const
	getPassID - Return the PassID number that corresponds to this pass.

virtual bool	doInitialization (Module &)
	doInitialization - Virtual method overridden by subclasses to do any necessary initialization before any pass is run.

virtual bool	doFinalization (Module &)
	doFinalization - Virtual method overriden by subclasses to do any necessary clean up after all passes have run.

virtual void	print (raw_ostream &OS, const Module *M) const
	print - Print out the internal state of the pass.

void	dump () const

virtual Pass *	createPrinterPass (raw_ostream &OS, const std::string &Banner) const =0
	createPrinterPass - Get a Pass appropriate to print the IR this pass operates on (Module, Function or MachineFunction).

virtual void	assignPassManager (PMStack &, PassManagerType)
	Each pass is responsible for assigning a pass manager to itself.

virtual void	preparePassManager (PMStack &)
	Check if available pass managers are suitable for this pass or not.

virtual PassManagerType	getPotentialPassManagerType () const
	Return what kind of Pass Manager can manage this pass.

void	setResolver (AnalysisResolver *AR)

AnalysisResolver *	getResolver () const

virtual void	getAnalysisUsage (AnalysisUsage &) const
	getAnalysisUsage - This function should be overriden by passes that need analysis information to do their job.

virtual void	releaseMemory ()
	releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memory when it is no longer needed.

virtual void *	getAdjustedAnalysisPointer (AnalysisID ID)
	getAdjustedAnalysisPointer - This method is used when a pass implements an analysis interface through multiple inheritance.

virtual ImmutablePass *	getAsImmutablePass ()

virtual PMDataManager *	getAsPMDataManager ()

virtual void	verifyAnalysis () const
	verifyAnalysis() - This member can be implemented by a analysis pass to check state of analysis information.

virtual void	dumpPassStructure (unsigned Offset=0)

template<typename AnalysisType >
AnalysisType *	getAnalysisIfAvailable () const
	getAnalysisIfAvailable<AnalysisType>() - Subclasses use this function to get analysis information that might be around, for example to update it.

bool	mustPreserveAnalysisID (char &AID) const
	mustPreserveAnalysisID - This method serves the same function as getAnalysisIfAvailable, but works if you just have an AnalysisID.

template<typename AnalysisType >
AnalysisType &	getAnalysis () const
	getAnalysis<AnalysisType>() - This function is used by subclasses to get to the analysis information that they claim to use by overriding the getAnalysisUsage function.

template<typename AnalysisType >
AnalysisType &	getAnalysis (Function &F, bool *Changed=nullptr)
	getAnalysis<AnalysisType>() - This function is used by subclasses to get to the analysis information that they claim to use by overriding the getAnalysisUsage function.

template<typename AnalysisType >
AnalysisType &	getAnalysisID (AnalysisID PI) const

template<typename AnalysisType >
AnalysisType &	getAnalysisID (AnalysisID PI, Function &F, bool *Changed=nullptr)

Static Public Attributes
static char	ID = 0

Friends
class	LoopBase< MachineBasicBlock, MachineLoop >

Additional Inherited Members
Static Public Member Functions inherited from llvm::Pass
static const PassInfo *	lookupPassInfo (const void *TI)

static const PassInfo *	lookupPassInfo (StringRef Arg)

static Pass *	createPass (AnalysisID ID)

Protected Member Functions inherited from llvm::MachineFunctionPass
	MachineFunctionPass (char &ID)

virtual bool	runOnMachineFunction (MachineFunction &MF)=0
	runOnMachineFunction - This method must be overloaded to perform the desired machine code transformation or analysis.

void	getAnalysisUsage (AnalysisUsage &AU) const override
	getAnalysisUsage - Subclasses that override getAnalysisUsage must call this.

virtual MachineFunctionProperties	getRequiredProperties () const

virtual MachineFunctionProperties	getSetProperties () const

virtual MachineFunctionProperties	getClearedProperties () const

Protected Member Functions inherited from llvm::FunctionPass
bool	skipFunction (const Function &F) const
	Optional passes call this function to check whether the pass should be skipped.

Detailed Description

Definition at line 104 of file MachineLoopInfo.h.

Member Typedef Documentation

◆ iterator

using llvm::MachineLoopInfo::iterator = LoopInfoBase<MachineBasicBlock, MachineLoop>::iterator

The iterator interface to the top-level loops in the current function.

Definition at line 134 of file MachineLoopInfo.h.

Constructor & Destructor Documentation

◆ MachineLoopInfo() [1/3]

MachineLoopInfo::MachineLoopInfo ( )

Definition at line 34 of file MachineLoopInfo.cpp.

References llvm::PassRegistry::getPassRegistry(), and llvm::initializeMachineLoopInfoPass().

◆ MachineLoopInfo() [2/3]

llvm::MachineLoopInfo::MachineLoopInfo ( MachineDominatorTree & MDT )

inlineexplicit

Definition at line 113 of file MachineLoopInfo.h.

◆ MachineLoopInfo() [3/3]

llvm::MachineLoopInfo::MachineLoopInfo ( const MachineLoopInfo & )

delete

Member Function Documentation

◆ addTopLevelLoop()

void llvm::MachineLoopInfo::addTopLevelLoop ( MachineLoop * New )

inline

This adds the specified loop to the collection of top-level loops.

Definition at line 186 of file MachineLoopInfo.h.

References llvm::LoopInfoBase< BlockT, LoopT >::addTopLevelLoop().

◆ begin()

iterator llvm::MachineLoopInfo::begin ( ) const

inline

Definition at line 135 of file MachineLoopInfo.h.

References llvm::LoopInfoBase< BlockT, LoopT >::begin().

◆ calculate()

void MachineLoopInfo::calculate ( MachineDominatorTree & MDT )

Definition at line 50 of file MachineLoopInfo.cpp.

References llvm::MachineDominatorTree::getBase(), and releaseMemory().

◆ changeLoopFor()

void llvm::MachineLoopInfo::changeLoopFor	(	MachineBasicBlock *	BB,
		MachineLoop *	L
	)

inline

Change the top-level loop that contains BB to the specified loop.

This should be used by transformations that restructure the loop hierarchy tree.

Definition at line 175 of file MachineLoopInfo.h.

References llvm::LoopInfoBase< BlockT, LoopT >::changeLoopFor().

◆ changeTopLevelLoop()

void llvm::MachineLoopInfo::changeTopLevelLoop	(	MachineLoop *	OldLoop,
		MachineLoop *	NewLoop
	)

inline

Replace the specified loop in the top-level loops list with the indicated loop.

Definition at line 181 of file MachineLoopInfo.h.

References llvm::LoopInfoBase< BlockT, LoopT >::changeTopLevelLoop().

◆ empty()

bool llvm::MachineLoopInfo::empty ( ) const

inline

Definition at line 137 of file MachineLoopInfo.h.

References llvm::LoopInfoBase< BlockT, LoopT >::empty().

◆ end()

iterator llvm::MachineLoopInfo::end ( ) const

inline

Definition at line 136 of file MachineLoopInfo.h.

References llvm::LoopInfoBase< BlockT, LoopT >::end().

◆ findLoopPreheader()

MachineBasicBlock * MachineLoopInfo::findLoopPreheader	(	MachineLoop *	L,
		bool	SpeculativePreheader = `false`,
		bool	FindMultiLoopPreheader = `false`
	)		const

Find the block that either is the loop preheader, or could speculatively be used as the preheader.

This is e.g. useful to place loop setup code. Code that cannot be speculated should not be placed here. SpeculativePreheader is controlling whether it also tries to find the speculative preheader if the regular preheader is not present. With FindMultiLoopPreheader = false, nullptr will be returned if the found preheader is the preheader of multiple loops.

Definition at line 118 of file MachineLoopInfo.cpp.

References getLoopFor(), llvm::MachineBasicBlock::hasAddressTaken(), P, PB(), llvm::MachineBasicBlock::pred_size(), llvm::MachineBasicBlock::predecessors(), and llvm::MachineBasicBlock::successors().

◆ getAnalysisUsage()

void MachineLoopInfo::getAnalysisUsage ( AnalysisUsage & AU ) const

overridevirtual

getAnalysisUsage - Subclasses that override getAnalysisUsage must call this.

For MachineFunctionPasses, calling AU.preservesCFG() indicates that the pass does not modify the MachineBasicBlock CFG.

Reimplemented from llvm::MachineFunctionPass.

Definition at line 55 of file MachineLoopInfo.cpp.

References llvm::AnalysisUsage::addRequired(), llvm::MachineFunctionPass::getAnalysisUsage(), and llvm::AnalysisUsage::setPreservesAll().

◆ getBase()

LoopInfoBase< MachineBasicBlock, MachineLoop > & llvm::MachineLoopInfo::getBase ( )

inline

Definition at line 120 of file MachineLoopInfo.h.

◆ getLoopDepth()

unsigned llvm::MachineLoopInfo::getLoopDepth ( const MachineBasicBlock * BB ) const

inline

Return the loop nesting level of the specified block.

Definition at line 151 of file MachineLoopInfo.h.

References llvm::LoopInfoBase< BlockT, LoopT >::getLoopDepth().

Referenced by llvm::VLIWMachineScheduler::schedule().

◆ getLoopFor()

MachineLoop * llvm::MachineLoopInfo::getLoopFor ( const MachineBasicBlock * BB ) const

inline

Return the innermost loop that BB lives in.

If a basic block is in no loop (for example the entry node), null is returned.

Definition at line 141 of file MachineLoopInfo.h.

References llvm::LoopInfoBase< BlockT, LoopT >::getLoopFor().

Referenced by llvm::HexagonPacketizerList::calcStall(), emitBasicBlockLoopComments(), llvm::SystemZPostRASchedStrategy::enterMBB(), findLoopPreheader(), llvm::WebAssembly::SortRegionInfo::getBottom(), llvm::WebAssembly::SortRegionInfo::getRegionFor(), sortBlocks(), and llvm::VirtRegAuxInfo::weightCalcHelper().

◆ isLoopHeader()

bool llvm::MachineLoopInfo::isLoopHeader ( const MachineBasicBlock * BB ) const

inline

True if the block is a loop header node.

Definition at line 156 of file MachineLoopInfo.h.

References llvm::LoopInfoBase< BlockT, LoopT >::isLoopHeader().

◆ operator=()

MachineLoopInfo & llvm::MachineLoopInfo::operator= ( const MachineLoopInfo & )

delete

◆ operator[]()

const MachineLoop * llvm::MachineLoopInfo::operator[] ( const MachineBasicBlock * BB ) const

inline

Same as getLoopFor.

Definition at line 146 of file MachineLoopInfo.h.

References llvm::LoopInfoBase< BlockT, LoopT >::getLoopFor().

◆ releaseMemory()

void llvm::MachineLoopInfo::releaseMemory ( )

inlineoverridevirtual

releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memory when it is no longer needed.

The default behavior of passes is to hold onto memory for the entire duration of their lifetime (which is the entire compile time). For pipelined passes, this is not a big deal because that memory gets recycled every time the pass is invoked on another program unit. For IP passes, it is more important to free memory when it is unused.

Optionally implement this function to release pass memory when it is no longer used.

Reimplemented from llvm::Pass.

Definition at line 164 of file MachineLoopInfo.h.

References llvm::LoopInfoBase< BlockT, LoopT >::releaseMemory().

Referenced by calculate().

◆ removeBlock()

void llvm::MachineLoopInfo::removeBlock ( MachineBasicBlock * BB )

inline

This method completely removes BB from all data structures, including all of the Loop objects it is nested in and our mapping from MachineBasicBlocks to loops.

Definition at line 193 of file MachineLoopInfo.h.

References llvm::LoopInfoBase< BlockT, LoopT >::removeBlock().

◆ removeLoop()

MachineLoop * llvm::MachineLoopInfo::removeLoop ( iterator I )

inline

This removes the specified top-level loop from this loop info object.

The loop is not deleted, as it will presumably be inserted into another loop.

Definition at line 170 of file MachineLoopInfo.h.

References I, and llvm::LoopInfoBase< BlockT, LoopT >::removeLoop().

◆ runOnMachineFunction()

bool MachineLoopInfo::runOnMachineFunction ( MachineFunction & F )

overridevirtual

Calculate the natural loop information.

Implements llvm::MachineFunctionPass.

Definition at line 45 of file MachineLoopInfo.cpp.

Friends And Related Function Documentation

◆ LoopBase< MachineBasicBlock, MachineLoop >

friend class LoopBase< MachineBasicBlock, MachineLoop >

friend

Definition at line 98 of file MachineLoopInfo.h.

Member Data Documentation

◆ ID

char MachineLoopInfo::ID = 0

static

Definition at line 110 of file MachineLoopInfo.h.

The documentation for this class was generated from the following files:

include/llvm/CodeGen/MachineLoopInfo.h
lib/CodeGen/MachineLoopInfo.cpp

Public Types

Public Member Functions

Static Public Attributes

Friends

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ iterator

Constructor & Destructor Documentation

◆ MachineLoopInfo() [1/3]

◆ MachineLoopInfo() [2/3]

◆ MachineLoopInfo() [3/3]

Member Function Documentation

◆ addTopLevelLoop()

◆ begin()

◆ calculate()

◆ changeLoopFor()

◆ changeTopLevelLoop()

◆ empty()

◆ end()

◆ findLoopPreheader()

◆ getAnalysisUsage()

◆ getBase()

◆ getLoopDepth()

◆ getLoopFor()

◆ isLoopHeader()

◆ operator=()

◆ operator[]()

◆ releaseMemory()

◆ removeBlock()

◆ removeLoop()

◆ runOnMachineFunction()

Friends And Related Function Documentation

◆ LoopBase< MachineBasicBlock, MachineLoop >

Member Data Documentation

◆ ID