clang-tools-extra/clang-tidy/bugprone/TerminatingContinueCheck.cpp

   1 //===--- TerminatingContinueCheck.cpp - clang-tidy-------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "TerminatingContinueCheck.h"
  10 #include "clang/AST/ASTContext.h"
  11 #include "clang/ASTMatchers/ASTMatchFinder.h"
  12 #include "clang/Lex/Lexer.h"
  13 #include "clang/Tooling/FixIt.h"
  14
  15 using namespace clang::ast_matchers;
  16
  17 namespace clang::tidy::bugprone {
  18
  19 void TerminatingContinueCheck::registerMatchers(MatchFinder *Finder) {
  20   const auto DoWithFalse =
  21       doStmt(hasCondition(ignoringImpCasts(
  22                  anyOf(cxxBoolLiteral(equals(false)), integerLiteral(equals(0)),
  23                        cxxNullPtrLiteralExpr(), gnuNullExpr()))),
  24              equalsBoundNode("closestLoop"));
  25
  26   Finder->addMatcher(
  27       continueStmt(
  28           hasAncestor(stmt(anyOf(forStmt(), whileStmt(), cxxForRangeStmt(),
  29                                  doStmt(), switchStmt()))
  30                           .bind("closestLoop")),
  31           hasAncestor(DoWithFalse))
  32           .bind("continue"),
  33       this);
  34 }
  35
  36 void TerminatingContinueCheck::check(const MatchFinder::MatchResult &Result) {
  37   const auto *ContStmt = Result.Nodes.getNodeAs<ContinueStmt>("continue");
  38
  39   auto Diag =
  40       diag(ContStmt->getBeginLoc(),
  41            "'continue' in loop with false condition is equivalent to 'break'")
  42       << tooling::fixit::createReplacement(*ContStmt, "break");
  43 }
  44
  45 } // namespace clang::tidy::bugprone