[#llvm-AAResults-callCapturesBefore-05]
= xref:llvm.adoc[llvm]::xref:llvm/AAResults.adoc[AAResults]::callCapturesBefore
:relfileprefix: ../../
:mrdocs:

Return information about whether a particular call site modifies or reads the specified memory location `MemLoc` before instruction `I` in a BasicBlock.

== Synopsis

Declared in `<llvm/Analysis/AliasAnalysis.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:llvm/ModRefInfo.adoc[ModRefInfo]
callCapturesBefore(
    xref:llvm/Instruction.adoc[Instruction] const* I,
    xref:llvm/MemoryLocation.adoc[MemoryLocation] const& MemLoc,
    xref:llvm/DominatorTree.adoc[DominatorTree]* DT);
----

== Return Value

ModRef info describing capture‐based access before `I.`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *I*
| Instruction providing the query context.
| *MemLoc*
| Memory location that may be captured.
| *DT*
| Dominator tree used for capture analysis.
|===


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