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1 //===--- DefaultArgumentsDeclarationsCheck.cpp - clang-tidy ---------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "DefaultArgumentsDeclarationsCheck.h"
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10
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11 using namespace clang::ast_matchers;
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12
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13 namespace clang {
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14 namespace tidy {
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15 namespace fuchsia {
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16
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17 void DefaultArgumentsDeclarationsCheck::registerMatchers(MatchFinder *Finder) {
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18 // Declaring default parameters is disallowed.
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19 Finder->addMatcher(parmVarDecl(hasDefaultArgument()).bind("decl"), this);
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20 }
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21
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22 void DefaultArgumentsDeclarationsCheck::check(
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23 const MatchFinder::MatchResult &Result) {
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24 const auto *D = Result.Nodes.getNodeAs<ParmVarDecl>("decl");
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25 if (!D)
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26 return;
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27
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28 SourceRange DefaultArgRange = D->getDefaultArgRange();
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29
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30 if (DefaultArgRange.getEnd() != D->getEndLoc())
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31 return;
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32
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33 if (DefaultArgRange.getBegin().isMacroID()) {
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34 diag(D->getBeginLoc(),
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35 "declaring a parameter with a default argument is disallowed");
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36 return;
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37 }
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38
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39 SourceLocation StartLocation =
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40 D->getName().empty() ? D->getBeginLoc() : D->getLocation();
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41
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42 SourceRange RemovalRange(
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43 Lexer::getLocForEndOfToken(StartLocation, 0, *Result.SourceManager,
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44 Result.Context->getLangOpts()),
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45 DefaultArgRange.getEnd());
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46
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47 diag(D->getBeginLoc(),
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48 "declaring a parameter with a default argument is disallowed")
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49 << D << FixItHint::CreateRemoval(RemovalRange);
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50 }
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51
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52 } // namespace fuchsia
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53 } // namespace tidy
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54 } // namespace clang
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