LLVM  4.0.0
Public Types | Static Public Member Functions | List of all members
llvm::MetadataTracking Class Reference

API for tracking metadata references through RAUW and deletion. More...

#include <Metadata.h>

Public Types

typedef PointerUnion
< MetadataAsValue *, Metadata * > 
OwnerTy
 

Static Public Member Functions

static bool track (Metadata *&MD)
 Track the reference to metadata. More...
 
static bool track (void *Ref, Metadata &MD, Metadata &Owner)
 Track the reference to metadata for Metadata. More...
 
static bool track (void *Ref, Metadata &MD, MetadataAsValue &Owner)
 Track the reference to metadata for MetadataAsValue. More...
 
static void untrack (Metadata *&MD)
 Stop tracking a reference to metadata. More...
 
static void untrack (void *Ref, Metadata &MD)
 
static bool retrack (Metadata *&MD, Metadata *&New)
 Move tracking from one reference to another. More...
 
static bool retrack (void *Ref, Metadata &MD, void *New)
 
static bool isReplaceable (const Metadata &MD)
 Check whether metadata is replaceable. More...
 

Detailed Description

API for tracking metadata references through RAUW and deletion.

Shared API for updating Metadata pointers in subclasses that support RAUW.

This API is not meant to be used directly. See TrackingMDRef for a user-friendly tracking reference.

Definition at line 195 of file Metadata.h.

Member Typedef Documentation

Definition at line 250 of file Metadata.h.

Member Function Documentation

bool MetadataTracking::isReplaceable ( const Metadata MD)
static

Check whether metadata is replaceable.

Definition at line 162 of file Metadata.cpp.

Referenced by llvm::TrackingMDRef::hasTrivialDestructor(), and retrack().

static bool llvm::MetadataTracking::retrack ( Metadata *&  MD,
Metadata *&  New 
)
inlinestatic

Move tracking from one reference to another.

Semantically equivalent to untrack(MD) followed by track(New), except that ownership callbacks are maintained.

Note: it is an error if *MD does not equal New.

Returns
true iff tracking is supported by MD.

Definition at line 242 of file Metadata.h.

bool MetadataTracking::retrack ( void *  Ref,
Metadata MD,
void *  New 
)
static

Definition at line 147 of file Metadata.cpp.

References assert(), and isReplaceable().

static bool llvm::MetadataTracking::track ( Metadata *&  MD)
inlinestatic

Track the reference to metadata.

Register MD with *MD, if the subclass supports tracking. If *MD gets RAUW'ed, MD will be updated to the new address. If *MD gets deleted, MD will be set to nullptr.

If tracking isn't supported, *MD will not change.

Returns
true iff tracking is supported by MD.

Definition at line 206 of file Metadata.h.

Referenced by llvm::ReplaceableMetadataImpl::replaceAllUsesWith(), and track().

static bool llvm::MetadataTracking::track ( void *  Ref,
Metadata MD,
Metadata Owner 
)
inlinestatic

Track the reference to metadata for Metadata.

As track(Metadata*&), but with support for calling back to Owner to tell it that its operand changed. This could trigger Owner being re-uniqued.

Definition at line 215 of file Metadata.h.

References track().

static bool llvm::MetadataTracking::track ( void *  Ref,
Metadata MD,
MetadataAsValue Owner 
)
inlinestatic

Track the reference to metadata for MetadataAsValue.

As track(Metadata*&), but with support for calling back to Owner to tell it that its operand changed. This could trigger Owner being re-uniqued.

Definition at line 224 of file Metadata.h.

References track().

static void llvm::MetadataTracking::untrack ( Metadata *&  MD)
inlinestatic

Stop tracking a reference to metadata.

Stops *MD from tracking MD.

Definition at line 231 of file Metadata.h.

References untrack().

Referenced by untrack().

void MetadataTracking::untrack ( void *  Ref,
Metadata MD 
)
static

Definition at line 139 of file Metadata.cpp.

References assert().


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