class SwiftErrorValueTracking

Declaration

class SwiftErrorValueTracking { /* full declaration omitted */ };

Declared at: llvm/include/llvm/CodeGen/SwiftErrorValueTracking.h:34

Member Variables

private llvm::MachineFunction* MF

private const llvm::Function* Fn

private const llvm::TargetLowering* TLI

private const llvm::TargetInstrInfo* TII

private DenseMap<std::pair<const MachineBasicBlock*, const Value*>, llvm::Register> VRegDefMap

A map from swifterror value in a basic block to the virtual register it is currently represented by.

private DenseMap<std::pair<const MachineBasicBlock*, const Value*>, llvm::Register> VRegUpwardsUse

A list of upward exposed vreg uses that need to be satisfied by either a copy def or a phi node at the beginning of the basic block representing the predecessor(s) swifterror value.

private llvm::DenseMap< PointerIntPair<const Instruction*, 1, bool>, Register> VRegDefUses

A map from instructions that define/use a swifterror value to the virtual register that represents that def/use.

private const llvm::Value* SwiftErrorArg

The swifterror argument of the current function.

private llvm::SwiftErrorValueTracking::SwiftErrorValues SwiftErrorVals

A function can only have a single swifterror argument. And if it does have a swifterror argument, it must be the first entry in SwiftErrorVals.

Method Overview

• public bool createEntriesInEntryBlock(llvm::DebugLoc DbgLoc)
• public const llvm::Value * getFunctionArg() const
• public llvm::Register getOrCreateVReg(const llvm::MachineBasicBlock *, const llvm::Value *)
• public llvm::Register getOrCreateVRegDefAt(const llvm::Instruction *, const llvm::MachineBasicBlock *, const llvm::Value *)
• public llvm::Register getOrCreateVRegUseAt(const llvm::Instruction *, const llvm::MachineBasicBlock *, const llvm::Value *)
• public void preassignVRegs(llvm::MachineBasicBlock * MBB, BasicBlock::const_iterator Begin, BasicBlock::const_iterator End)
• public void propagateVRegs()
• public void setCurrentVReg(const llvm::MachineBasicBlock * MBB, const llvm::Value *, llvm::Register)
• public void setFunction(llvm::MachineFunction & MF)

Methods

¶bool createEntriesInEntryBlock(
    llvm::DebugLoc DbgLoc)

Description

Create initial definitions of swifterror values in the entry block of the current function.

Declared at: llvm/include/llvm/CodeGen/SwiftErrorValueTracking.h:96

Parameters

llvm::DebugLoc DbgLoc

¶const llvm::Value* getFunctionArg() const

Description

Get the (unique) function argument that was marked swifterror, or nullptr if this function has no swifterror args.

Declared at: llvm/include/llvm/CodeGen/SwiftErrorValueTracking.h:72

¶llvm::Register getOrCreateVReg(
    const llvm::MachineBasicBlock*,
    const llvm::Value*)

Description

Get or create the swifterror value virtual register in VRegDefMap for this basic block.

Declared at: llvm/include/llvm/CodeGen/SwiftErrorValueTracking.h:78

Parameters

const llvm::MachineBasicBlock*

const llvm::Value*

¶llvm::Register getOrCreateVRegDefAt(
    const llvm::Instruction*,
    const llvm::MachineBasicBlock*,
    const llvm::Value*)

Description

Get or create the swifterror value virtual register for a def of a swifterror by an instruction.

Declared at: llvm/include/llvm/CodeGen/SwiftErrorValueTracking.h:86

Parameters

const llvm::Instruction*

const llvm::MachineBasicBlock*

const llvm::Value*

¶llvm::Register getOrCreateVRegUseAt(
    const llvm::Instruction*,
    const llvm::MachineBasicBlock*,
    const llvm::Value*)

Description

Get or create the swifterror value virtual register for a use of a swifterror by an instruction.

Declared at: llvm/include/llvm/CodeGen/SwiftErrorValueTracking.h:91

Parameters

const llvm::Instruction*

const llvm::MachineBasicBlock*

const llvm::Value*

¶void preassignVRegs(
    llvm::MachineBasicBlock* MBB,
    BasicBlock::const_iterator Begin,
    BasicBlock::const_iterator End)

Declared at: llvm/include/llvm/CodeGen/SwiftErrorValueTracking.h:102

Parameters

llvm::MachineBasicBlock* MBB

BasicBlock::const_iterator Begin

BasicBlock::const_iterator End

¶void propagateVRegs()

Description

Propagate assigned swifterror vregs through a function, synthesizing PHI nodes when needed to maintain consistency.

Declared at: llvm/include/llvm/CodeGen/SwiftErrorValueTracking.h:100

¶void setCurrentVReg(
    const llvm::MachineBasicBlock* MBB,
    const llvm::Value*,
    llvm::Register)

Description

Set the swifterror virtual register in the VRegDefMap for this basic block.

Declared at: llvm/include/llvm/CodeGen/SwiftErrorValueTracking.h:82

Parameters

const llvm::MachineBasicBlock* MBB

const llvm::Value*

llvm::Register

¶void setFunction(llvm::MachineFunction& MF)

Description

Initialize data structures for specified new function.

Declared at: llvm/include/llvm/CodeGen/SwiftErrorValueTracking.h:68

Parameters

llvm::MachineFunction& MF