forked from OSchip/llvm-project
114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
//===--- UseUsingCheck.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 "UseUsingCheck.h"
|
|
#include "clang/AST/ASTContext.h"
|
|
#include "clang/Lex/Lexer.h"
|
|
|
|
using namespace clang::ast_matchers;
|
|
|
|
namespace clang {
|
|
namespace tidy {
|
|
namespace modernize {
|
|
|
|
UseUsingCheck::UseUsingCheck(StringRef Name, ClangTidyContext *Context)
|
|
: ClangTidyCheck(Name, Context),
|
|
IgnoreMacros(Options.getLocalOrGlobal("IgnoreMacros", true)) {}
|
|
|
|
void UseUsingCheck::registerMatchers(MatchFinder *Finder) {
|
|
if (!getLangOpts().CPlusPlus11)
|
|
return;
|
|
Finder->addMatcher(typedefDecl(unless(isInstantiated())).bind("typedef"),
|
|
this);
|
|
}
|
|
|
|
// Checks if 'typedef' keyword can be removed - we do it only if
|
|
// it is the only declaration in a declaration chain.
|
|
static bool CheckRemoval(SourceManager &SM, SourceLocation StartLoc,
|
|
ASTContext &Context) {
|
|
assert(StartLoc.isFileID() && "StartLoc must not be in a macro");
|
|
std::pair<FileID, unsigned> LocInfo = SM.getDecomposedLoc(StartLoc);
|
|
StringRef File = SM.getBufferData(LocInfo.first);
|
|
const char *TokenBegin = File.data() + LocInfo.second;
|
|
Lexer DeclLexer(SM.getLocForStartOfFile(LocInfo.first), Context.getLangOpts(),
|
|
File.begin(), TokenBegin, File.end());
|
|
|
|
Token Tok;
|
|
int ParenLevel = 0;
|
|
bool FoundTypedef = false;
|
|
|
|
while (!DeclLexer.LexFromRawLexer(Tok) && !Tok.is(tok::semi)) {
|
|
switch (Tok.getKind()) {
|
|
case tok::l_brace:
|
|
case tok::r_brace:
|
|
// This might be the `typedef struct {...} T;` case.
|
|
return false;
|
|
case tok::l_paren:
|
|
ParenLevel++;
|
|
break;
|
|
case tok::r_paren:
|
|
ParenLevel--;
|
|
break;
|
|
case tok::comma:
|
|
if (ParenLevel == 0) {
|
|
// If there is comma and we are not between open parenthesis then it is
|
|
// two or more declarations in this chain.
|
|
return false;
|
|
}
|
|
break;
|
|
case tok::raw_identifier:
|
|
if (Tok.getRawIdentifier() == "typedef") {
|
|
FoundTypedef = true;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Sanity check against weird macro cases.
|
|
return FoundTypedef;
|
|
}
|
|
|
|
void UseUsingCheck::check(const MatchFinder::MatchResult &Result) {
|
|
const auto *MatchedDecl = Result.Nodes.getNodeAs<TypedefDecl>("typedef");
|
|
if (MatchedDecl->getLocation().isInvalid())
|
|
return;
|
|
|
|
auto &Context = *Result.Context;
|
|
auto &SM = *Result.SourceManager;
|
|
|
|
SourceLocation StartLoc = MatchedDecl->getBeginLoc();
|
|
|
|
if (StartLoc.isMacroID() && IgnoreMacros)
|
|
return;
|
|
|
|
auto Diag =
|
|
diag(StartLoc, "use 'using' instead of 'typedef'");
|
|
|
|
// do not fix if there is macro or array
|
|
if (MatchedDecl->getUnderlyingType()->isArrayType() || StartLoc.isMacroID())
|
|
return;
|
|
|
|
if (CheckRemoval(SM, StartLoc, Context)) {
|
|
auto printPolicy = PrintingPolicy(getLangOpts());
|
|
printPolicy.SuppressScope = true;
|
|
printPolicy.ConstantArraySizeAsWritten = true;
|
|
printPolicy.UseVoidForZeroParams = false;
|
|
|
|
Diag << FixItHint::CreateReplacement(
|
|
MatchedDecl->getSourceRange(),
|
|
"using " + MatchedDecl->getNameAsString() + " = " +
|
|
MatchedDecl->getUnderlyingType().getAsString(printPolicy));
|
|
}
|
|
}
|
|
|
|
} // namespace modernize
|
|
} // namespace tidy
|
|
} // namespace clang
|