class UndefValue

Declaration

class UndefValue : public ConstantData { /* full declaration omitted */ };

Description

'undef' values are things that do not have specified contents. These are used for a variety of purposes, including global variable initializers and operands to instructions. 'undef' values can occur with any first-class type. Undef values aren't exactly constants; if they have multiple uses, they can appear to have different bit patterns at each use. See LangRef.html#undefvalues for details.

Declared at: llvm/include/llvm/IR/Constants.h:1286

Inherits from: ConstantData

Member Variables

Inherited from Value:

protected SubclassOptionalData

protected NumUserOperands

protected IsUsedByMD

protected HasName

protected HasHungOffUses

protected HasDescriptor

public static MaxAlignmentExponent = 29

public static MaximumAlignment = 1U << MaxAlignmentExponent

Method Overview

• public UndefValue(const llvm::UndefValue &)
• public static bool classof(const llvm::Value * V)
• public static llvm::UndefValue * get(llvm::Type * T)
• public llvm::UndefValue * getElementValue(llvm::Constant * C) const
• public llvm::UndefValue * getElementValue(unsigned int Idx) const
• public unsigned int getNumElements() const
• public llvm::UndefValue * getSequentialElement() const
• public llvm::UndefValue * getStructElement(unsigned int Elt) const

Inherited from ConstantData:

• public classof

Inherited from Constant:

• public canTrap
• public classof
• public containsConstantExpression
• public containsUndefElement
• public destroyConstant
• public getAggregateElement
• public getAggregateElement
• public getAllOnesValue
• public getIntegerValue
• public getNullValue
• public getSplatValue
• public getUniqueInteger
• public handleOperandChange
• public hasExactInverseFP
• public isAllOnesValue
• public isConstantUsed
• public isDLLImportDependent
• public isElementWiseEqual
• public isFiniteNonZeroFP
• public isMinSignedValue
• public isNaN
• public isNegativeZeroValue
• public isNormalFP
• public isNotMinSignedValue
• public isNotOneValue
• public isNullValue
• public isOneValue
• public isThreadDependent
• public isZeroValue
• public needsRelocation
• public removeDeadConstantUsers
• public replaceUndefsWith
• public stripPointerCasts
• public stripPointerCasts

Inherited from User:

• protected Op
• protected Op
• protected OpFrom
• protected allocHungoffUses
• public classof
• public dropAllReferences
• public getDescriptor
• public getDescriptor
• public getNumOperands
• public getOperand
• public getOperandList
• public getOperandList
• public getOperandUse
• public getOperandUse
• protected growHungoffUses
• public op_begin
• public op_begin
• public op_end
• public op_end
• public operand_values
• public operand_values
• public operands
• public operands
• public replaceUsesOfWith
• public setGlobalVariableNumOperands
• public setNumHungOffUseOperands
• public setOperand
• public value_op_begin
• public value_op_begin
• public value_op_end
• public value_op_end

Inherited from Value:

• public DoPHITranslation
• public DoPHITranslation
• public addUse
• public assertModuleIsMaterialized
• public assertModuleIsMaterializedImpl
• public clearSubclassOptionalData
• public deleteValue
• public dump
• public getContext
• public getName
• public getNumUses
• public getPointerAlignment
• public getPointerDereferenceableBytes
• public getRawSubclassOptionalData
• protected getSubclassDataFromValue
• public getType
• public getValueID
• public getValueName
• public hasNUses
• public hasNUsesOrMore
• public hasName
• public hasOneUse
• public hasSameSubclassOptionalData
• public hasValueHandle
• public isSwiftError
• public isUsedByMetadata
• public isUsedInBasicBlock
• public materialized_use_begin
• public materialized_use_begin
• public materialized_use_empty
• public materialized_user_begin
• public materialized_user_begin
• public materialized_users
• public materialized_users
• public materialized_uses
• public materialized_uses
• public mutateType
• public print
• public print
• public printAsOperand
• public printAsOperand
• public replaceAllUsesWith
• public replaceNonMetadataUsesWith
• public replaceUsesOutsideBlock
• public replaceUsesWithIf
• public reverseUseList
• public setName
• public setValueName
• protected setValueSubclassData
• public sortUseList
• public stripAndAccumulateConstantOffsets
• public stripAndAccumulateConstantOffsets
• public stripAndAccumulateInBoundsConstantOffsets
• public stripAndAccumulateInBoundsConstantOffsets
• public stripInBoundsConstantOffsets
• public stripInBoundsConstantOffsets
• public stripInBoundsOffsets
• public stripInBoundsOffsets
• public stripPointerCasts
• public stripPointerCasts
• public stripPointerCastsAndAliases
• public stripPointerCastsAndAliases
• public stripPointerCastsAndInvariantGroups
• public stripPointerCastsAndInvariantGroups
• public stripPointerCastsSameRepresentation
• public stripPointerCastsSameRepresentation
• public takeName
• public use_begin
• public use_begin
• public use_empty
• public use_end
• public use_end
• public user_back
• public user_back
• public user_begin
• public user_begin
• public user_empty
• public user_end
• public user_end
• public users
• public users
• public uses
• public uses

Methods

¶UndefValue(const llvm::UndefValue&)

Declared at: llvm/include/llvm/IR/Constants.h:1294

Parameters

const llvm::UndefValue&

¶static bool classof(const llvm::Value* V)

Description

Methods for support type inquiry through isa, cast, and dyn_cast:

Declared at: llvm/include/llvm/IR/Constants.h:1318

Parameters

const llvm::Value* V

¶static llvm::UndefValue* get(llvm::Type* T)

Description

Static factory methods - Return an 'undef' object of the specified type.

Declared at: llvm/include/llvm/IR/Constants.h:1297

Parameters

llvm::Type* T

¶llvm::UndefValue* getElementValue(
    llvm::Constant* C) const

Description

Return an undef of the right value for the specified GEP index if we can, otherwise return null (e.g. if C is a ConstantExpr).

Declared at: llvm/include/llvm/IR/Constants.h:1309

Parameters

llvm::Constant* C

¶llvm::UndefValue* getElementValue(
    unsigned int Idx) const

Description

Return an undef of the right value for the specified GEP index.

Declared at: llvm/include/llvm/IR/Constants.h:1312

Parameters

unsigned int Idx

¶unsigned int getNumElements() const

Description

Return the number of elements in the array, vector, or struct.

Declared at: llvm/include/llvm/IR/Constants.h:1315

¶llvm::UndefValue* getSequentialElement() const

Description

If this Undef has array or vector type, return a undef with the right element type.

Declared at: llvm/include/llvm/IR/Constants.h:1301

¶llvm::UndefValue* getStructElement(
    unsigned int Elt) const

Description

If this undef has struct type, return a undef with the right element type for the specified element.

Declared at: llvm/include/llvm/IR/Constants.h:1305

Parameters

unsigned int Elt