[#llvm-DebugSSAUpdater]
= xref:llvm.adoc[llvm]::DebugSSAUpdater
:relfileprefix: ../
:mrdocs:

Class used to determine the live ranges of debug variables in IR using SSA construction (via the SSAUpdaterImpl class), used for analysis purposes.

== Synopsis

Declared in `<llvm/Transforms/Utils/DebugSSAUpdater.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class DebugSSAUpdater;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:llvm/DebugSSAUpdater/2constructor-0b.adoc[`DebugSSAUpdater`]         [.small]#[constructor]#
| Constructors
| xref:llvm/DebugSSAUpdater/2destructor.adoc[`~DebugSSAUpdater`] [.small]#[destructor]#
| Destroy owned `DbgSSABlock` wrappers.
| xref:llvm/DebugSSAUpdater/operator_assign.adoc[`operator=`]  [.small]#[deleted]#
| Deleted copy assignment.
| xref:llvm/DebugSSAUpdater/addAvailableValue.adoc[`addAvailableValue`] 
| Indicate that a rewritten value is available in the specified block with the specified value.
| xref:llvm/DebugSSAUpdater/findValueForBlock.adoc[`findValueForBlock`] 
| Return the value for the specified block if the DebugSSAUpdater has one, otherwise return nullptr.
| xref:llvm/DebugSSAUpdater/getDbgSSABlock.adoc[`getDbgSSABlock`] 
| For a given BB, create a wrapper block for it. Stores it in the DebugSSAUpdater block map.
| xref:llvm/DebugSSAUpdater/getValueAtEndOfBlock.adoc[`getValueAtEndOfBlock`] 
| Construct SSA form, materializing a value that is live at the end of the specified block.
| xref:llvm/DebugSSAUpdater/getValueInMiddleOfBlock.adoc[`getValueInMiddleOfBlock`] 
| Construct SSA form, materializing a value that is live in the middle of the specified block.
| xref:llvm/DebugSSAUpdater/hasValueForBlock.adoc[`hasValueForBlock`] 
| Return true if the DebugSSAUpdater already has a value for the specified block.
| xref:llvm/DebugSSAUpdater/initialize.adoc[`initialize`] 
| Clear available values in preparation for a new SSA construction.
| xref:llvm/DebugSSAUpdater/reset.adoc[`reset`] 
| Reset available values and destroy owned block wrappers.
|===


== Friends

[cols="1,4"]
|===
| Name| Description
| `xref:llvm/SSAUpdaterTraits.adoc[llvm::SSAUpdaterTraits]`
| Traits used by SSAUpdaterImpl to adapt an SSA updater implementation.
|===


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