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

   1 //===--- SwitchMissingDefaultCaseCheck.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 "SwitchMissingDefaultCaseCheck.h"
  10 #include "clang/AST/ASTContext.h"
  11
  12 using namespace clang::ast_matchers;
  13
  14 namespace clang::tidy::bugprone {
  15
  16 namespace {
  17
  18 AST_MATCHER(SwitchStmt, hasDefaultCase) {
  19   const SwitchCase *Case = Node.getSwitchCaseList();
  20   while (Case) {
  21     if (DefaultStmt::classof(Case))
  22       return true;
  23
  24     Case = Case->getNextSwitchCase();
  25   }
  26   return false;
  27 }
  28 } // namespace
  29
  30 void SwitchMissingDefaultCaseCheck::registerMatchers(MatchFinder *Finder) {
  31   Finder->addMatcher(
  32       switchStmt(hasCondition(expr(unless(isInstantiationDependent()),
  33                                    hasType(qualType(hasCanonicalType(
  34                                        unless(hasDeclaration(enumDecl()))))))),
  35                  unless(hasDefaultCase()))
  36           .bind("switch"),
  37       this);
  38 }
  39
  40 void SwitchMissingDefaultCaseCheck::check(
  41     const ast_matchers::MatchFinder::MatchResult &Result) {
  42   const auto *Switch = Result.Nodes.getNodeAs<SwitchStmt>("switch");
  43
  44   diag(Switch->getSwitchLoc(), "switching on non-enum value without "
  45                                "default case may not cover all cases");
  46 }
  47 } // namespace clang::tidy::bugprone