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[Assignment Tracking][Docs] Add new metadata to LangRef.rst

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And link to the AssignmentTracking.md document which goes into more detail.

Reviewed By: jryans

Differential Revision: https://reviews.llvm.org/D141131
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OCHyams 2023-01-11 15:38:01 +00:00
parent 39564dc382
commit a66c8c7f34
1 changed files with 15 additions and 0 deletions
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llvm/docs/LangRef.rst
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@ -5998,6 +5998,21 @@ valid debug intrinsic.
!4 = !DIExpression(DW_OP_constu, 2, DW_OP_swap, DW_OP_xderef)
!5 = !DIExpression(DW_OP_constu, 42, DW_OP_stack_value)
DIAssignID
""""""""""""
``DIAssignID`` nodes have no operands and are always distinct. They are used to
link together `@llvm.dbg.assign` intrinsics (:ref:`debug
intrinsics<dbg_intrinsics>`) and instructions that store in IR. See `Debug Info
Assignment Tracking <AssignmentTracking.html>`_ for more info.
.. code-block:: llvm
store i32 %a, ptr %a.addr, align 4, !DIAssignID !2
llvm.dbg.assign(metadata %a, metadata !1, metadata !DIExpression(), !2, metadata %a.addr, metadata !DIExpression()), !dbg !3
!2 = distinct !DIAssignID()
DIArgList
""""""""""""