Export clang-format16 via ydblib project

6e6be3a95868fde888d801b7590af4044049563f

1 files changed, 96 insertions, 0 deletions

diff --git a/contrib/libs/clang16/tools/extra/clang-tidy/performance/FasterStringFindCheck.cpp b/contrib/libs/clang16/tools/extra/clang-tidy/performance/FasterStringFindCheck.cpp
new file mode 100644
index 0000000000..d932b5fb93
--- /dev/null
+++ b/contrib/libs/clang16/tools/extra/clang-tidy/performance/FasterStringFindCheck.cpp
@@ -0,0 +1,96 @@
+//===--- FasterStringFindCheck.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 "FasterStringFindCheck.h"
+#include "../utils/OptionsUtils.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "llvm/Support/raw_ostream.h"
+#include <optional>
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::performance {
+
+namespace {
+
+std::optional<std::string> makeCharacterLiteral(const StringLiteral *Literal) {
+  std::string Result;
+  {
+    llvm::raw_string_ostream OS(Result);
+    Literal->outputString(OS);
+  }
+  // Now replace the " with '.
+  auto Pos = Result.find_first_of('"');
+  if (Pos == Result.npos)
+    return std::nullopt;
+  Result[Pos] = '\'';
+  Pos = Result.find_last_of('"');
+  if (Pos == Result.npos)
+    return std::nullopt;
+  Result[Pos] = '\'';
+  return Result;
+}
+
+AST_MATCHER_FUNCTION(ast_matchers::internal::Matcher<Expr>,
+                     hasSubstitutedType) {
+  return hasType(qualType(anyOf(substTemplateTypeParmType(),
+                                hasDescendant(substTemplateTypeParmType()))));
+}
+
+} // namespace
+
+FasterStringFindCheck::FasterStringFindCheck(StringRef Name,
+                                             ClangTidyContext *Context)
+    : ClangTidyCheck(Name, Context),
+      StringLikeClasses(utils::options::parseStringList(
+          Options.get("StringLikeClasses",
+                      "::std::basic_string;::std::basic_string_view"))) {}
+
+void FasterStringFindCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
+  Options.store(Opts, "StringLikeClasses",
+                utils::options::serializeStringList(StringLikeClasses));
+}
+
+void FasterStringFindCheck::registerMatchers(MatchFinder *Finder) {
+  const auto SingleChar =
+      expr(ignoringParenCasts(stringLiteral(hasSize(1)).bind("literal")));
+  const auto StringFindFunctions =
+      hasAnyName("find", "rfind", "find_first_of", "find_first_not_of",
+                 "find_last_of", "find_last_not_of");
+
+  Finder->addMatcher(
+      cxxMemberCallExpr(
+          callee(functionDecl(StringFindFunctions).bind("func")),
+          anyOf(argumentCountIs(1), argumentCountIs(2)),
+          hasArgument(0, SingleChar),
+          on(expr(hasType(hasUnqualifiedDesugaredType(recordType(hasDeclaration(
+                      recordDecl(hasAnyName(StringLikeClasses)))))),
+                  unless(hasSubstitutedType())))),
+      this);
+}
+
+void FasterStringFindCheck::check(const MatchFinder::MatchResult &Result) {
+  const auto *Literal = Result.Nodes.getNodeAs<StringLiteral>("literal");
+  const auto *FindFunc = Result.Nodes.getNodeAs<FunctionDecl>("func");
+
+  auto Replacement = makeCharacterLiteral(Literal);
+  if (!Replacement)
+    return;
+
+  diag(Literal->getBeginLoc(), "%0 called with a string literal consisting of "
+                               "a single character; consider using the more "
+                               "effective overload accepting a character")
+      << FindFunc
+      << FixItHint::CreateReplacement(
+             CharSourceRange::getTokenRange(Literal->getBeginLoc(),
+                                            Literal->getEndLoc()),
+             *Replacement);
+}
+
+} // namespace clang::tidy::performance