[llvm] [TableGen] Rework error reporting for duplicate Feature/Processor. (PR #102257)

[Sergei Barannikov via llvm-commits]

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@@ -0,0 +1,52 @@
+//===- Utils.cpp - Common Utilities -----------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Utils.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/TableGen/Error.h"
+#include "llvm/TableGen/Record.h"
+#include <algorithm>
+
+using namespace llvm;
+
+/// Sort an array of Records on the "Name" field, and check for records with
+/// duplicate "Name" field. If duplicates are found, report a fatal error.
+void llvm::sortAndReportDuplicates(MutableArrayRef<Record *> Records,
+                                   StringRef ObjectName) {
+  llvm::sort(Records, LessRecordFieldNameAndName());
+
+  auto I = std::adjacent_find(Records.begin(), Records.end(),
+                              [](const Record *Rec1, const Record *Rec2) {
+                                return Rec1->getValueAsString("Name") ==
+                                       Rec2->getValueAsString("Name");
+                              });
+  if (I == Records.end())
+    return;
+
+  // Found a duplicate name.
+  const Record *First = *I;
+  const Record *Second = *(I + 1);
+
+  auto GetSourceLocation = [](const Record *Rec) {
+    const SMLoc Loc = Rec->getLoc()[0];
+    const MemoryBuffer *MB =
+        SrcMgr.getMemoryBuffer(SrcMgr.FindBufferContainingLoc(Loc));
+    StringRef BufferID = MB->getBufferIdentifier();
+    auto LineAndCol = SrcMgr.getLineAndColumn(Loc);
+    return std::tuple(BufferID, LineAndCol.first, LineAndCol.second);
+  };
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s-barannikov wrote:

FWIW there is `Record::getLoc()`.


https://github.com/llvm/llvm-project/pull/102257