Discriminated union of Pass ID types.
Declared in <llvm/CodeGen/TargetPassConfig.h>
class IdentifyingPassPtr;The PassConfig API prefers dealing with IDs because they are safer and more efficient. IDs decouple configuration from instantiation. This way, when a pass is overriden, it isn't unnecessarily instantiated. It is also unsafe to refer to a Pass pointer after adding it to a pass manager, which deletes redundant pass instances.
However, it is convient to directly instantiate target passes with non-default ctors. These often don't have a registered PassInfo. Rather than force all target passes to implement the pass registry boilerplate, allow the PassConfig API to handle either type.
AnalysisID is sadly char*, so PointerIntPair won't work.
| Name | Description |
|---|---|
IdentifyingPassPtr [constructor] | Constructors |
getID | Return the analysis ID held by this object. |
getInstance | Return the Pass instance held by this object. |
isInstance | Return true if this holds a concrete Pass instance rather than an ID. |
isValid | Return true if this holds a non-null pass ID or instance. |
| Name | Description |
|---|---|
ID [variant member] | Pass analysis ID when this does not hold an instance. |
P [variant member] | Concrete pass instance when IsInstance is true. |