This class tracks both per-statepoint and per-selectiondag information. More...

#include "CodeGen/SelectionDAG/StatepointLowering.h"

Public Member Functions
	StatepointLoweringState ()=default

void	startNewStatepoint (SelectionDAGBuilder &Builder)
	Reset all state tracking for a newly encountered safepoint.

void	clear ()
	Clear the memory usage of this object.

SDValue	getLocation (SDValue Val)
	Returns the spill location of a value incoming to the current statepoint.

void	setLocation (SDValue Val, SDValue Location)

void	scheduleRelocCall (const GCRelocateInst &RelocCall)
	Record the fact that we expect to encounter a given gc_relocate before the next statepoint.

void	relocCallVisited (const GCRelocateInst &RelocCall)
	Remove this gc_relocate from the list we're expecting to see before the next statepoint.

SDValue	allocateStackSlot (EVT ValueType, SelectionDAGBuilder &Builder)
	Get a stack slot we can use to store an value of type ValueType.

void	reserveStackSlot (int Offset)

bool	isStackSlotAllocated (int Offset)

Detailed Description

This class tracks both per-statepoint and per-selectiondag information.

For each statepoint it tracks locations of it's gc valuess (incoming and relocated) and list of gcreloc calls scheduled for visiting (this is used for a debug mode consistency check only). The spill slot tracking works in concert with information in FunctionLoweringInfo.

Definition at line 33 of file StatepointLowering.h.

Constructor & Destructor Documentation

◆ StatepointLoweringState()

llvm::StatepointLoweringState::StatepointLoweringState ( )

default

Member Function Documentation

◆ allocateStackSlot()

SDValue StatepointLoweringState::allocateStackSlot	(	EVT	ValueType,
		SelectionDAGBuilder &	Builder
	)

Get a stack slot we can use to store an value of type ValueType.

This will hopefully be a recylced slot from another statepoint.

Definition at line 107 of file StatepointLowering.cpp.

References assert(), llvm::SelectionDAG::CreateStackTemporary(), llvm::SelectionDAGBuilder::DAG, llvm::SelectionDAGBuilder::FuncInfo, llvm::SelectionDAG::getFrameIndex(), llvm::MachineFunction::getFrameInfo(), llvm::SelectionDAG::getMachineFunction(), llvm::MachineFrameInfo::getObjectSize(), llvm::MachineFrameInfo::markAsStatepointSpillSlotObjectIndex(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallBitVector::resize(), llvm::SmallBitVector::set(), llvm::SmallBitVector::size(), llvm::SmallVectorBase< Size_T >::size(), llvm::FunctionLoweringInfo::StatepointStackSlots, and llvm::SmallBitVector::test().

Referenced by spillIncomingStatepointValue().

◆ clear()

void StatepointLoweringState::clear ( )

Clear the memory usage of this object.

This is called from SelectionDAGBuilder::clear. We require this is never called in the midst of processing a statepoint sequence.

Definition at line 99 of file StatepointLowering.cpp.

References assert(), and llvm::SmallBitVector::clear().

Referenced by llvm::SelectionDAGBuilder::clear().

◆ getLocation()

SDValue llvm::StatepointLoweringState::getLocation ( SDValue Val )

inline

Returns the spill location of a value incoming to the current statepoint.

Will return SDValue() if this value hasn't been spilled. Otherwise, the value has already been spilled and no further action is required by the caller.

Definition at line 50 of file StatepointLowering.h.

References I.

Referenced by llvm::SelectionDAGBuilder::LowerAsSTATEPOINT(), reservePreviousStackSlotForValue(), and spillIncomingStatepointValue().