[clang-tools-extra] [clang-tidy] Add `performance-explicit-move-constructor` check (PR #122599)

[via cfe-commits]

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@@ -0,0 +1,73 @@
+//===--- ExplicitMoveConstructorCheck.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 "ExplicitMoveConstructorCheck.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/Lex/Lexer.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::performance {
+
+static SourceRange findExplicitToken(const CXXConstructorDecl *Ctor,
+                                     const SourceManager &Source,
+                                     const LangOptions &LangOpts) {
+  SourceLocation CurrentLoc = Ctor->getBeginLoc();
+  SourceLocation EndLoc = Ctor->getEndLoc();
+  Token Tok;
+
+  do {
+    const bool failed = Lexer::getRawToken(CurrentLoc, Tok, Source, LangOpts);
+
+    if (failed)
+      return {};
+
+    if (Tok.is(tok::raw_identifier) && Tok.getRawIdentifier() == "explicit")
+      return {Tok.getLocation(), Tok.getEndLoc()};
+
+    CurrentLoc = Tok.getEndLoc();
+  } while (Tok.isNot(tok::eof) && CurrentLoc < EndLoc);
+
+  return {};
+}
+
+void ExplicitMoveConstructorCheck::registerMatchers(MatchFinder *Finder) {
+  Finder->addMatcher(
+      cxxRecordDecl(
+          has(cxxConstructorDecl(isMoveConstructor(), isExplicit(),
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dodicidodici wrote:

That would be with `isWritten` right?

https://github.com/llvm/llvm-project/pull/122599