SwitchMissingDefaultCaseCheck.cpp

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//===--- SwitchMissingDefaultCaseCheck.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 "SwitchMissingDefaultCaseCheck.h"
#include "clang/AST/ASTContext.h"
 
using namespace clang::ast_matchers;
 
namespace clang::tidy::bugprone {
 
namespace {
 
AST_MATCHER(SwitchStmt, hasDefaultCase) {
  const SwitchCase *Case = Node.getSwitchCaseList();
  while (Case) {
    if (DefaultStmt::classof(Case))
      return true;
 
    Case = Case->getNextSwitchCase();
  }
  return false;
}
} // namespace
 
void SwitchMissingDefaultCaseCheck::registerMatchers(MatchFinder *Finder) {
  Finder->addMatcher(
      switchStmt(hasCondition(expr(unless(isInstantiationDependent()),
                                   hasType(qualType(hasCanonicalType(
                                       unless(hasDeclaration(enumDecl()))))))),
                 unless(hasDefaultCase()))
          .bind("switch"),
      this);
}
 
void SwitchMissingDefaultCaseCheck::check(
    const ast_matchers::MatchFinder::MatchResult &Result) {
  const auto *Switch = Result.Nodes.getNodeAs<SwitchStmt>("switch");
 
  diag(Switch->getSwitchLoc(), "switching on non-enum value without "
                               "default case may not cover all cases");
}
} // namespace clang::tidy::bugprone