LiveDebugValues::VLocTracker Class Reference

Collection of DBG_VALUEs observed when traversing a block. More...

#include "CodeGen/LiveDebugValues/InstrRefBasedImpl.h"

Public Member Functions
	VLocTracker (DebugVariableMap &DVMap, const OverlapMap &O, const DIExpression *EmptyExpr)
void	defVar (const MachineInstr &MI, const DbgValueProperties &Properties, const SmallVectorImpl< DbgOpID > &DebugOps)
void	considerOverlaps (const DebugVariable &Var, const DILocation *Loc)
void	clear ()

Public Attributes
DebugVariableMap &	DVMap
	Ref to function-wide map of DebugVariable <=> ID-numbers.
MapVector< DebugVariableID, DbgValue >	Vars
	Map DebugVariable to the latest Value it's defined to have.
SmallDenseMap< DebugVariableID, const DILocation *, 8 >	Scopes
MachineBasicBlock *	MBB = nullptr
const OverlapMap &	OverlappingFragments
DbgValueProperties	EmptyProperties

Detailed Description

Collection of DBG_VALUEs observed when traversing a block.

Records each variable and the value the DBG_VALUE refers to. Requires the machine value location dataflow algorithm to have run already, so that values can be identified.

Definition at line 1042 of file InstrRefBasedImpl.h.

Constructor & Destructor Documentation

VLocTracker()

LiveDebugValues::VLocTracker::VLocTracker ( DebugVariableMap &  DVMap, const OverlapMap &  O, const DIExpression *  EmptyExpr  )

inline

Definition at line 1062 of file InstrRefBasedImpl.h.

Member Function Documentation

clear()

void LiveDebugValues::VLocTracker::clear ( )

inline

Definition at line 1116 of file InstrRefBasedImpl.h.

References Scopes, and Vars.

considerOverlaps()

void LiveDebugValues::VLocTracker::considerOverlaps ( const DebugVariable &  Var, const DILocation *  Loc  )

inline

Definition at line 1087 of file InstrRefBasedImpl.h.

References DVMap, EmptyProperties, llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::end(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::find(), llvm::DebugVariable::getFragmentOrDefault(), llvm::DebugVariable::getInlinedAt(), llvm::DebugVariable::getVariable(), LiveDebugValues::DebugVariableMap::insertDVID(), llvm::DebugVariable::isDefaultFragment(), OverlappingFragments, Scopes, LiveDebugValues::DbgValue::Undef, and Vars.

Referenced by defVar().

defVar()

void LiveDebugValues::VLocTracker::defVar ( const MachineInstr &  MI, const DbgValueProperties &  Properties, const SmallVectorImpl< DbgOpID > &  DebugOps  )

inline

Definition at line 1067 of file InstrRefBasedImpl.h.

References assert(), considerOverlaps(), DVMap, LiveDebugValues::DebugVariableMap::insertDVID(), MI, Scopes, llvm::SmallVectorBase< Size_T >::size(), LiveDebugValues::DbgValue::Undef, and Vars.

Member Data Documentation

DVMap

DebugVariableMap& LiveDebugValues::VLocTracker::DVMap

Ref to function-wide map of DebugVariable <=> ID-numbers.

Definition at line 1045 of file InstrRefBasedImpl.h.

Referenced by considerOverlaps(), and defVar().

EmptyProperties

DbgValueProperties LiveDebugValues::VLocTracker::EmptyProperties

Definition at line 1059 of file InstrRefBasedImpl.h.

Referenced by considerOverlaps().

MBB

MachineBasicBlock* LiveDebugValues::VLocTracker::MBB = nullptr

Definition at line 1057 of file InstrRefBasedImpl.h.

OverlappingFragments

const OverlapMap& LiveDebugValues::VLocTracker::OverlappingFragments

Definition at line 1058 of file InstrRefBasedImpl.h.

Referenced by considerOverlaps().

Scopes

SmallDenseMap<DebugVariableID, const DILocation *, 8> LiveDebugValues::VLocTracker::Scopes

Definition at line 1056 of file InstrRefBasedImpl.h.

Referenced by clear(), considerOverlaps(), and defVar().

Vars

MapVector<DebugVariableID, DbgValue> LiveDebugValues::VLocTracker::Vars

Map DebugVariable to the latest Value it's defined to have.

Needs to be a MapVector because we determine order-in-the-input-MIR from the order in this container. (FIXME: likely no longer true as the ordering is now provided by DebugVariableMap). We only retain the last DbgValue in each block for each variable, to determine the blocks live-out variable value. The Vars container forms the transfer function for this block, as part of the dataflow analysis. The movement of values between locations inside of a block is handled at a much later stage, in the TransferTracker class.

Definition at line 1055 of file InstrRefBasedImpl.h.

Referenced by clear(), considerOverlaps(), and defVar().

---

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

• lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.h