[clang-tools-extra] [clang-tidy] Add `modernize-use-uniform-initializer` check (PR #91124)

[Piotr Zegar via cfe-commits]

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@@ -0,0 +1,320 @@
+//===--- UseUniformInitializerCheck.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 "UseUniformInitializerCheck.h"
+#include "../utils/LexerUtils.h"
+#include "clang/Tooling/FixIt.h"
+
+AST_MATCHER(clang::VarDecl, isVarOldStyleInitializer) {
+  // If it doesn't have any initializer the initializer style is not defined.
+  if (!Node.hasInit())
+    return false;
+
+  const clang::VarDecl::InitializationStyle InitStyle = Node.getInitStyle();
+
+  return InitStyle == clang::VarDecl::InitializationStyle::CInit ||
+         InitStyle == clang::VarDecl::InitializationStyle::CallInit;
+}
+
+AST_MATCHER(clang::FieldDecl, isFieldOldStyleInitializer) {
+  // If it doesn't have any initializer the initializer style is not defined.
+  if (!Node.hasInClassInitializer() || Node.getInClassInitializer() == nullptr)
+    return false;
+
+  const clang::InClassInitStyle InitStyle = Node.getInClassInitStyle();
+
+  return InitStyle == clang::InClassInitStyle::ICIS_CopyInit;
+}
+
+AST_MATCHER(clang::CXXCtorInitializer, isCStyleInitializer) {
+  const clang::Expr *Init = Node.getInit();
+  if (Init == nullptr)
+    return false;
+
+  return !llvm::isa<clang::InitListExpr>(Init);
+}
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::modernize {
+
+namespace {
+
+constexpr const StringRef VarDeclID = "VarDecl";
+constexpr const StringRef FieldDeclId = "FieldDecl";
+constexpr const StringRef CtorInitID = "CtorInit";
+
+constexpr const StringRef CStyleWarningMessage =
+    "Use uniform initializer instead of C-style initializer";
+
+constexpr StringRef
+getInitializerStyleName(VarDecl::InitializationStyle InitStyle) {
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PiotrZSL wrote:

static 

https://github.com/llvm/llvm-project/pull/91124