[llvm] [mlir] Add missing return on nullptr check (PR #92125)

[Daniel Kuts via llvm-commits]

https://github.com/apach301 updated https://github.com/llvm/llvm-project/pull/92125

>From 0c10430e892cb7fee57ddbd0359fc4252d3de400 Mon Sep 17 00:00:00 2001
From: Daniil Kutz <kutz at ispras.ru>
Date: Tue, 14 May 2024 16:58:19 +0300
Subject: [PATCH 1/2] Add missing return on nullptr check

---
 llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
index 88d353e89a461..92347b7b58a12 100644
--- a/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
@@ -3392,8 +3392,10 @@ static bool HandleUse(TreePattern &I, TreePatternNodePtr Pat,
   Record *Rec;
   if (Pat->isLeaf()) {
     DefInit *DI = dyn_cast<DefInit>(Pat->getLeafValue());
-    if (!DI)
+    if (!DI) {
       I.error("Input $" + Pat->getName() + " must be an identifier!");
+      return false;
+    }
     Rec = DI->getDef();
   } else {
     Rec = Pat->getOperator();

>From caed1d55fef527abe284715cf168bddaee298dc1 Mon Sep 17 00:00:00 2001
From: Daniil Kutz <kutz at ispras.ru>
Date: Tue, 14 May 2024 18:40:37 +0300
Subject: [PATCH 2/2] Fix null pointer dereference in error message

---
 mlir/lib/Dialect/Transform/IR/TransformOps.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mlir/lib/Dialect/Transform/IR/TransformOps.cpp b/mlir/lib/Dialect/Transform/IR/TransformOps.cpp
index eb09f007fbca8..a6e4e340da407 100644
--- a/mlir/lib/Dialect/Transform/IR/TransformOps.cpp
+++ b/mlir/lib/Dialect/Transform/IR/TransformOps.cpp
@@ -654,7 +654,7 @@ LogicalResult transform::ApplyConversionPatternsOp::verify() {
       InFlightDiagnostic diag = emitOpError()
                                 << "expected default converter child op to "
                                    "implement TypeConverterBuilderOpInterface";
-      diag.attachNote(typeConverterOp->getLoc()) << "op without interface";
+      diag.attachNote(typeConverterRegion.front().front()->getLoc()) << "op without interface";
       return diag;
     }
     // Check default type converter type.