llvm-project

9e8012cd - [MLIR] Fix crash in alias printer when encountering null operands (#188581)

[MLIR] Fix crash in alias printer when encountering null operands (#188581) When the IR contains operations with null operand values, the DummyAliasOperationPrinter used during alias collection crashed when iterating over operand types via op->getOperandTypes(), because ValueTypeIterator::mapElement calls value.getType() on each operand, which dereferences null for a null Value. Fix the crash by: 1. Iterating over operand values directly in printGenericOp, skipping any null operands. 2. Adding a null-type guard in printType so that null types are silently skipped. 3. Adding a null-type guard at the top of printAndVisitNestedAliasesImpl to avoid crashing when visiting sub-elements of a null type. The test requires using --mlir-very-unsafe-disable-verifier-on-parsing to construct the invalid IR. Fixes #182747 Assisted-by: Claude Code