[llvm] [mlir][bufferization] Add OwnershipBasedBufferDeallocation pass option to forbid clones (PR #66626)

[Martin Erhart via llvm-commits]

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@@ -132,16 +132,21 @@ void DeallocationState::getLiveMemrefsIn(Block *block,
   memrefs.append(liveMemrefs);
 }
 
-std::pair<Value, Value>
-DeallocationState::getMemrefWithUniqueOwnership(OpBuilder &builder,
-                                                Value memref, Block *block) {
+FailureOr<std::pair<Value, Value>>
+DeallocationState::getMemrefWithUniqueOwnership(
+    const DeallocationOptions &options, OpBuilder &builder, Value memref,
+    Block *block) {
   auto iter = ownershipMap.find({memref, block});
   assert(iter != ownershipMap.end() &&
          "Value must already have been registered in the ownership map");
 
   Ownership ownership = iter->second;
   if (ownership.isUnique())
-    return {memref, ownership.getIndicator()};
+    return std::make_pair(memref, ownership.getIndicator());
+
+  if (!options.allowCloning)
+    return emitError(memref.getLoc(),
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maerhart wrote:

This error does not exist anymore, but I've added testcases for the new ownership indicator materialization mechanism and the insertion of `cf.assert` ops.

https://github.com/llvm/llvm-project/pull/66626