clang-tools-extra/clang-tidy/fuchsia/DefaultArgumentsDeclarationsCheck.cpp

   1 //===--- DefaultArgumentsDeclarationsCheck.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 "DefaultArgumentsDeclarationsCheck.h"
  10 #include "clang/Lex/Lexer.h"
  11
  12 using namespace clang::ast_matchers;
  13
  14 namespace clang::tidy::fuchsia {
  15
  16 void DefaultArgumentsDeclarationsCheck::registerMatchers(MatchFinder *Finder) {
  17   // Declaring default parameters is disallowed.
  18   Finder->addMatcher(parmVarDecl(hasDefaultArgument()).bind("decl"), this);
  19 }
  20
  21 void DefaultArgumentsDeclarationsCheck::check(
  22     const MatchFinder::MatchResult &Result) {
  23   const auto *D = Result.Nodes.getNodeAs<ParmVarDecl>("decl");
  24   if (!D)
  25     return;
  26
  27   SourceRange DefaultArgRange = D->getDefaultArgRange();
  28
  29   if (DefaultArgRange.getEnd() != D->getEndLoc())
  30     return;
  31
  32   if (DefaultArgRange.getBegin().isMacroID()) {
  33     diag(D->getBeginLoc(),
  34          "declaring a parameter with a default argument is disallowed");
  35     return;
  36   }
  37
  38   SourceLocation StartLocation =
  39       D->getName().empty() ? D->getBeginLoc() : D->getLocation();
  40
  41   SourceRange RemovalRange(
  42       Lexer::getLocForEndOfToken(StartLocation, 0, *Result.SourceManager,
  43                                  Result.Context->getLangOpts()),
  44       DefaultArgRange.getEnd());
  45
  46   diag(D->getBeginLoc(),
  47        "declaring a parameter with a default argument is disallowed")
  48       << D << FixItHint::CreateRemoval(RemovalRange);
  49 }
  50
  51 } // namespace clang::tidy::fuchsia