[Mlir-commits] [mlir] [mlir] Avoid crash in mlir-query by using dyn_cast instead of cast for FileLineColLoc (PR #145049)

[Denzel-Brian Budii]

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@@ -38,21 +38,23 @@ MatchFinder::collectMatches(Operation *root, DynMatcher matcher) const {
 
 void MatchFinder::printMatch(llvm::raw_ostream &os, QuerySession &qs,
                              Operation *op) const {
-  auto fileLoc = cast<FileLineColLoc>(op->getLoc());
-  SMLoc smloc = qs.getSourceManager().FindLocForLineAndColumn(
-      qs.getBufferId(), fileLoc.getLine(), fileLoc.getColumn());
-  llvm::SMDiagnostic diag =
-      qs.getSourceManager().GetMessage(smloc, llvm::SourceMgr::DK_Note, "");
-  diag.print("", os, true, false, true);
+  if (auto fileLoc = dyn_cast<FileLineColLoc>(op->getLoc())) {
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chios202 wrote:

`auto fileLoc = op->getLoc()->findInstanceOf<FileLineColLoc>()` This seems to cause a segfault when calling `getStartLine()`

https://github.com/llvm/llvm-project/pull/145049