class LostDebugLocObserver

Declaration

class LostDebugLocObserver : public GISelChangeObserver { /* full declaration omitted */ };

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).

Declared at: llvm/include/llvm/CodeGen/GlobalISel/LostDebugLocObserver.h:19

Inherits from: GISelChangeObserver

Member Variables

private llvm::StringRef DebugType
private SmallSet<llvm::DebugLoc, 4> LostDebugLocs
private SmallPtrSet<llvm::MachineInstr*, 4> PotentialMIsForDebugLocs
private unsigned int NumLostDebugLocs = 0

Method Overview

Inherited from GISelChangeObserver:

Methods

LostDebugLocObserver(llvm::StringRef DebugType)

Declared at: llvm/include/llvm/CodeGen/GlobalISel/LostDebugLocObserver.h:26

Parameters

llvm::StringRef DebugType

void analyzeDebugLocations()

Declared at: llvm/include/llvm/CodeGen/GlobalISel/LostDebugLocObserver.h:46

void changedInstr(llvm::MachineInstr& MI)

Description

This instruction was mutated in some way.

Declared at: llvm/include/llvm/CodeGen/GlobalISel/LostDebugLocObserver.h:43

Parameters

llvm::MachineInstr& MI

void changingInstr(llvm::MachineInstr& MI)

Description

This instruction is about to be mutated in some way.

Declared at: llvm/include/llvm/CodeGen/GlobalISel/LostDebugLocObserver.h:42

Parameters

llvm::MachineInstr& MI

void checkpoint(bool CheckDebugLocs = true)

Description

Call this to indicate that it's a good point to assess whether locations have been lost. Typically this will be when a logical change has been completed such as the caller has finished replacing some instructions with alternatives. When CheckDebugLocs is true, the locations will be checked to see if any have been lost since the last checkpoint. When CheckDebugLocs is false, it will just reset ready for the next checkpoint without checking anything. This can be helpful to limit the detection to easy-to-fix portions of an algorithm before allowing more difficult ones.

Declared at: llvm/include/llvm/CodeGen/GlobalISel/LostDebugLocObserver.h:38

Parameters

bool CheckDebugLocs = true

void createdInstr(llvm::MachineInstr& MI)

Description

An instruction has been created and inserted into the function. Note that the instruction might not be a fully fledged instruction at this point and won't be if the MachineFunction::Delegate is calling it. This is because the delegate only sees the construction of the MachineInstr before operands have been added.

Declared at: llvm/include/llvm/CodeGen/GlobalISel/LostDebugLocObserver.h:40

Parameters

llvm::MachineInstr& MI

void erasingInstr(llvm::MachineInstr& MI)

Description

An instruction is about to be erased.

Declared at: llvm/include/llvm/CodeGen/GlobalISel/LostDebugLocObserver.h:41

Parameters

llvm::MachineInstr& MI

unsigned int getNumLostDebugLocs() const

Declared at: llvm/include/llvm/CodeGen/GlobalISel/LostDebugLocObserver.h:28