Abstract class that contains various methods for clients to notify about changes. More...

#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"

Inheritance diagram for llvm::GISelChangeObserver:

Public Member Functions
virtual	~GISelChangeObserver ()

virtual void	erasingInstr (MachineInstr &MI)=0
	An instruction is about to be erased. More...

virtual void	createdInstr (MachineInstr &MI)=0
	An instruction was created and inserted into the function. More...

virtual void	changingInstr (MachineInstr &MI)=0
	This instruction is about to be mutated in some way. More...

virtual void	changedInstr (MachineInstr &MI)=0
	This instruction was mutated in some way. More...

void	changingAllUsesOfReg (const MachineRegisterInfo &MRI, unsigned Reg)
	All the instructions using the given register are being changed. More...

void	finishedChangingAllUsesOfReg ()
	All instructions reported as changing by changingAllUsesOfReg() have finished being changed. More...

Detailed Description

Abstract class that contains various methods for clients to notify about changes.

This should be the preferred way for APIs to notify changes. Typically calling erasingInstr/createdInstr multiple times should not affect the result. The observer would likely need to check if it was already notified earlier (consider using GISelWorkList).

Definition at line 29 of file GISelChangeObserver.h.

Constructor & Destructor Documentation

◆ ~GISelChangeObserver()

virtual llvm::GISelChangeObserver::~GISelChangeObserver ( )

inlinevirtual

Definition at line 33 of file GISelChangeObserver.h.

References changedInstr(), changingAllUsesOfReg(), changingInstr(), createdInstr(), erasingInstr(), finishedChangingAllUsesOfReg(), MI, MRI, and Reg.

Member Function Documentation

◆ changedInstr()

virtual void llvm::GISelChangeObserver::changedInstr ( MachineInstr & MI )

pure virtual

This instruction was mutated in some way.

Implemented in llvm::GISelCSEInfo, and llvm::GISelObserverWrapper.

Referenced by finishedChangingAllUsesOfReg(), llvm::CombinerHelper::replaceRegOpWith(), llvm::LegalizerHelper::widenScalar(), and ~GISelChangeObserver().

◆ changingAllUsesOfReg()

void GISelChangeObserver::changingAllUsesOfReg	(	const MachineRegisterInfo &	MRI,
		unsigned	Reg
	)

All the instructions using the given register are being changed.

For convenience, finishedChangingAllUsesOfReg() will report the completion of the changes. The use list may change between this call and finishedChangingAllUsesOfReg().

Definition at line 19 of file GISelChangeObserver.cpp.

References changingInstr(), and llvm::MachineRegisterInfo::use_instructions().

Referenced by llvm::CombinerHelper::replaceRegWith(), and ~GISelChangeObserver().