[clang-tools-extra] [clang-tidy] Add new check bugprone-tagged-union-member-count (PR #89925)

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/89925 at github.com>


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@@ -0,0 +1,192 @@
+//===--- TaggedUnionMemberCountCheck.cpp - clang-tidy ---------------------===//
+//
+// 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 "TaggedUnionMemberCountCheck.h"
+#include "../utils/OptionsUtils.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallSet.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::bugprone {
+
+static constexpr llvm::StringLiteral StrictModeOptionName = "StrictMode";
+static constexpr llvm::StringLiteral EnableCountingEnumHeuristicOptionName =
+    "EnableCountingEnumHeuristic";
+static constexpr llvm::StringLiteral CountingEnumPrefixesOptionName =
+    "CountingEnumPrefixes";
+static constexpr llvm::StringLiteral CountingEnumSuffixesOptionName =
+    "CountingEnumSuffixes";
+
+static constexpr bool StrictModeOptionDefaultValue = false;
+static constexpr bool EnableCountingEnumHeuristicOptionDefaultValue = true;
+static constexpr llvm::StringLiteral CountingEnumPrefixesOptionDefaultValue =
+    "";
+static constexpr llvm::StringLiteral CountingEnumSuffixesOptionDefaultValue =
+    "count";
+
+static constexpr llvm::StringLiteral RootMatchBindName = "root";
+static constexpr llvm::StringLiteral UnionMatchBindName = "union";
+static constexpr llvm::StringLiteral TagMatchBindName = "tags";
+
+namespace {
+AST_MATCHER(FieldDecl, isUnion) {
+  const Type *T = Node.getType().getCanonicalType().getTypePtr();
+  assert(T);
+  return T->isUnionType();
+}
+
+AST_MATCHER(FieldDecl, isEnum) {
+  const Type *T = Node.getType().getCanonicalType().getTypePtr();
+  assert(T);
+  return T->isEnumeralType();
+}
+
+AST_MATCHER_P2(RecordDecl, fieldCountOfKindIsGT,
+               ast_matchers::internal::Matcher<FieldDecl>, InnerMatcher,
+               unsigned, N) {
+  unsigned matchCount = 0;
+  for (const auto field : Node.fields()) {
+    if (InnerMatcher.matches(*field, Finder, Builder)) {
+      matchCount += 1;
+    }
+  }
+  return matchCount > N;
+}
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whisperity wrote:

All variable names should be formatted according to LLVM guidelines, which says that local variables are CamelCase.

https://github.com/llvm/llvm-project/pull/89925