100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
//===--- UseUsingCheck.cpp - clang-tidy------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "UseUsingCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/Lex/Lexer.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace modernize {
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void UseUsingCheck::registerMatchers(MatchFinder *Finder) {
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if (!getLangOpts().CPlusPlus11)
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return;
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Finder->addMatcher(typedefDecl().bind("typedef"), this);
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}
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// Checks if 'typedef' keyword can be removed - we do it only if
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// it is the only declaration in a declaration chain.
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static bool CheckRemoval(SourceManager &SM, SourceLocation StartLoc,
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ASTContext &Context) {
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assert(StartLoc.isFileID() && "StartLoc must not be in a macro");
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std::pair<FileID, unsigned> LocInfo = SM.getDecomposedLoc(StartLoc);
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StringRef File = SM.getBufferData(LocInfo.first);
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const char *TokenBegin = File.data() + LocInfo.second;
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Lexer DeclLexer(SM.getLocForStartOfFile(LocInfo.first), Context.getLangOpts(),
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File.begin(), TokenBegin, File.end());
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Token Tok;
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int ParenLevel = 0;
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bool FoundTypedef = false;
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while (!DeclLexer.LexFromRawLexer(Tok) && !Tok.is(tok::semi)) {
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switch (Tok.getKind()) {
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case tok::l_brace:
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case tok::r_brace:
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// This might be the `typedef struct {...} T;` case.
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return false;
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case tok::l_paren:
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ParenLevel++;
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break;
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case tok::r_paren:
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ParenLevel--;
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break;
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case tok::comma:
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if (ParenLevel == 0) {
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// If there is comma and we are not between open parenthesis then it is
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// two or more declarations in this chain.
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return false;
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}
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break;
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case tok::raw_identifier:
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if (Tok.getRawIdentifier() == "typedef") {
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FoundTypedef = true;
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}
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break;
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default:
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break;
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}
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}
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// Sanity check against weird macro cases.
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return FoundTypedef;
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}
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void UseUsingCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *MatchedDecl = Result.Nodes.getNodeAs<TypedefDecl>("typedef");
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if (MatchedDecl->getLocation().isInvalid())
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return;
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auto &Context = *Result.Context;
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auto &SM = *Result.SourceManager;
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auto Diag =
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diag(MatchedDecl->getLocStart(), "use 'using' instead of 'typedef'");
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SourceLocation StartLoc = MatchedDecl->getLocStart();
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if (StartLoc.isMacroID())
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return;
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if (CheckRemoval(SM, StartLoc, Context)) {
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Diag << FixItHint::CreateReplacement(
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MatchedDecl->getSourceRange(),
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"using " + MatchedDecl->getNameAsString() + " = " +
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MatchedDecl->getUnderlyingType().getAsString(getLangOpts()));
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}
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}
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} // namespace modernize
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} // namespace tidy
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} // namespace clang
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