llvm::AliasResult Class Reference

The possible results of an alias query. More...

#include "llvm/Analysis/AliasAnalysis.h"

Public Types
enum	Kind : uint8_t { NoAlias = 0, MayAlias, PartialAlias, MustAlias }

Public Member Functions
	AliasResult ()=delete
constexpr	AliasResult (const Kind &Alias)
	operator Kind () const
constexpr bool	hasOffset () const
constexpr int32_t	getOffset () const
void	setOffset (int32_t NewOffset)
void	swap (bool DoSwap=true)
	Helper for processing AliasResult for swapped memory location pairs. More...

Detailed Description

The possible results of an alias query.

These results are always computed between two MemoryLocation objects as a query to some alias analysis.

Note that these are unscoped enumerations because we would like to support implicitly testing a result for the existence of any possible aliasing with a conversion to bool, but an "enum class" doesn't support this. The canonical names from the literature are suffixed and unique anyways, and so they serve as global constants in LLVM for these results.

See docs/AliasAnalysis.html for more information on the specific meanings of these values.

Definition at line 82 of file AliasAnalysis.h.

Member Enumeration Documentation

Kind

enum llvm::AliasResult::Kind : uint8_t

Enumerator
NoAlias	The two locations do not alias at all. This value is arranged to convert to false, while all other values convert to true. This allows a boolean context to convert the result to a binary flag indicating whether there is the possibility of aliasing.
MayAlias	The two locations may or may not alias. This is the least precise result.
PartialAlias	The two locations alias, but only due to a partial overlap.
MustAlias	The two locations precisely alias each other.

Definition at line 94 of file AliasAnalysis.h.

Constructor & Destructor Documentation

AliasResult() [1/2]

llvm::AliasResult::AliasResult ( )

explicitdelete

AliasResult() [2/2]

constexpr llvm::AliasResult::AliasResult ( const Kind &  Alias )

inlineconstexpr

Definition at line 113 of file AliasAnalysis.h.

Member Function Documentation

getOffset()

constexpr int32_t llvm::AliasResult::getOffset ( ) const

inlineconstexpr

Definition at line 119 of file AliasAnalysis.h.

References assert().

Referenced by llvm::operator<<(), and swap().

hasOffset()

constexpr bool llvm::AliasResult::hasOffset ( ) const

inlineconstexpr

Definition at line 118 of file AliasAnalysis.h.

Referenced by llvm::operator<<(), and swap().

operator Kind()

llvm::AliasResult::operator Kind ( ) const

inline

Definition at line 116 of file AliasAnalysis.h.

setOffset()

void llvm::AliasResult::setOffset ( int32_t  NewOffset )

inline

Definition at line 123 of file AliasAnalysis.h.

Referenced by swap().

swap()

void llvm::AliasResult::swap ( bool  DoSwap = true )

inline

Helper for processing AliasResult for swapped memory location pairs.

Definition at line 131 of file AliasAnalysis.h.

References getOffset(), hasOffset(), and setOffset().

Referenced by PrintResults().

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

• include/llvm/Analysis/AliasAnalysis.h