DefaultArgumentsDeclarationsCheck.cpp

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//===----------------------------------------------------------------------===//
//
// 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 "DefaultArgumentsDeclarationsCheck.h"
#include "clang/Lex/Lexer.h"
 
using namespace clang::ast_matchers;
 
namespace clang::tidy::fuchsia {
 
void DefaultArgumentsDeclarationsCheck::registerMatchers(MatchFinder *Finder) {
  // Declaring default parameters is disallowed.
  Finder->addMatcher(parmVarDecl(hasDefaultArgument()).bind("decl"), this);
}
 
void DefaultArgumentsDeclarationsCheck::check(
    const MatchFinder::MatchResult &Result) {
  const auto *D = Result.Nodes.getNodeAs<ParmVarDecl>("decl");
  if (!D)
    return;
 
  SourceRange DefaultArgRange = D->getDefaultArgRange();
 
  if (DefaultArgRange.getEnd() != D->getEndLoc())
    return;
 
  if (DefaultArgRange.getBegin().isMacroID()) {
    diag(D->getBeginLoc(),
         "declaring a parameter with a default argument is disallowed");
    return;
  }
 
  SourceLocation StartLocation =
      D->getName().empty() ? D->getBeginLoc() : D->getLocation();
 
  SourceRange RemovalRange(
      Lexer::getLocForEndOfToken(StartLocation, 0, *Result.SourceManager,
                                 Result.Context->getLangOpts()),
      DefaultArgRange.getEnd());
 
  diag(D->getBeginLoc(),
       "declaring a parameter with a default argument is disallowed")
      << D << FixItHint::CreateRemoval(RemovalRange);
}
 
} // namespace clang::tidy::fuchsia