llvm::AssertingVH< ValueTy > Class Template Reference

Value handle that asserts if the Value is deleted. More...

#include "llvm/IR/ValueHandle.h"

Inheritance diagram for llvm::AssertingVH< ValueTy >:

Collaboration diagram for llvm::AssertingVH< ValueTy >:

Public Member Functions
	AssertingVH ()
	AssertingVH (ValueTy *P)
	AssertingVH (const AssertingVH &RHS)
	operator ValueTy * () const
ValueTy *	operator= (ValueTy *RHS)
ValueTy *	operator= (const AssertingVH< ValueTy > &RHS)
ValueTy *	operator-> () const
ValueTy &	operator* () const
Public Member Functions inherited from llvm::ValueHandleBase
	ValueHandleBase (HandleBaseKind Kind)
	ValueHandleBase (HandleBaseKind Kind, Value *V)
	~ValueHandleBase ()
Value *	operator= (Value *RHS)
Value *	operator= (const ValueHandleBase &RHS)
Value *	operator-> () const
Value &	operator* () const

Friends
struct	DenseMapInfo< AssertingVH< ValueTy > >

Additional Inherited Members
Static Public Member Functions inherited from llvm::ValueHandleBase
static void	ValueIsDeleted (Value *V)
static void	ValueIsRAUWd (Value *Old, Value *New)
Protected Types inherited from llvm::ValueHandleBase
enum	HandleBaseKind { Assert, Callback, Weak, WeakTracking }
	This indicates what sub class the handle actually is. More...
Protected Member Functions inherited from llvm::ValueHandleBase
	ValueHandleBase (const ValueHandleBase &RHS)
	ValueHandleBase (HandleBaseKind Kind, const ValueHandleBase &RHS)
Value *	getValPtr () const
void	RemoveFromUseList ()
	Remove this ValueHandle from its current use list. More...
void	clearValPtr ()
	Clear the underlying pointer without clearing the use list. More...
Static Protected Member Functions inherited from llvm::ValueHandleBase
static bool	isValid (Value *V)

Detailed Description

template<typename ValueTy>
class llvm::AssertingVH< ValueTy >

Value handle that asserts if the Value is deleted.

This is a Value Handle that points to a value and asserts out if the value is destroyed while the handle is still live. This is very useful for catching dangling pointer bugs and other things which can be non-obvious. One particularly useful place to use this is as the Key of a map. Dangling pointer bugs often lead to really subtle bugs that only occur if another object happens to get allocated to the same address as the old one. Using an AssertingVH ensures that an assert is triggered as soon as the bad delete occurs.

Note that an AssertingVH handle does not follow values across RAUW operations. This means that RAUW's need to explicitly update the AssertingVH's as it moves. This is required because in non-assert mode this class turns into a trivial wrapper around a pointer.

Definition at line 238 of file ValueHandle.h.

Constructor & Destructor Documentation

AssertingVH() [1/3]

template<typename ValueTy>

llvm::AssertingVH< ValueTy >::AssertingVH ( )

inline

Definition at line 262 of file ValueHandle.h.

AssertingVH() [2/3]

template<typename ValueTy>

llvm::AssertingVH< ValueTy >::AssertingVH ( ValueTy *  P )

inline

Definition at line 263 of file ValueHandle.h.

AssertingVH() [3/3]

template<typename ValueTy>

llvm::AssertingVH< ValueTy >::AssertingVH ( const AssertingVH< ValueTy > &  RHS )

inline

Definition at line 264 of file ValueHandle.h.

Member Function Documentation

operator ValueTy *()

template<typename ValueTy>

llvm::AssertingVH< ValueTy >::operator ValueTy * ( ) const

inline

Definition at line 270 of file ValueHandle.h.

References llvm::ValueHandleBase::getValPtr().

operator*()

template<typename ValueTy>

ValueTy& llvm::AssertingVH< ValueTy >::operator* ( ) const

inline

Definition at line 284 of file ValueHandle.h.

operator->()

template<typename ValueTy>

ValueTy* llvm::AssertingVH< ValueTy >::operator-> ( ) const

inline

Definition at line 283 of file ValueHandle.h.

operator=() [1/2]

template<typename ValueTy>

ValueTy* llvm::AssertingVH< ValueTy >::operator= ( ValueTy *  RHS )

inline

Definition at line 274 of file ValueHandle.h.

operator=() [2/2]

template<typename ValueTy>

ValueTy* llvm::AssertingVH< ValueTy >::operator= ( const AssertingVH< ValueTy > &  RHS )

inline

Definition at line 278 of file ValueHandle.h.

Friends And Related Function Documentation

DenseMapInfo< AssertingVH< ValueTy > >

template<typename ValueTy>

friend struct DenseMapInfo< AssertingVH< ValueTy > >

friend

Definition at line 243 of file ValueHandle.h.

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

• include/llvm/IR/ValueHandle.h