clang-tools-extra/clang-tidy/cert/VariadicFunctionDefCheck.cpp

   1 //===-- VariadicFunctionDefCheck.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 "VariadicFunctionDefCheck.h"
  10 #include "clang/AST/ASTContext.h"
  11 #include "clang/ASTMatchers/ASTMatchFinder.h"
  12
  13 using namespace clang::ast_matchers;
  14
  15 namespace clang::tidy::cert {
  16
  17 void VariadicFunctionDefCheck::registerMatchers(MatchFinder *Finder) {
  18   // We only care about function *definitions* that are variadic, and do not
  19   // have extern "C" language linkage.
  20   Finder->addMatcher(
  21       functionDecl(isDefinition(), isVariadic(), unless(isExternC()))
  22           .bind("func"),
  23       this);
  24 }
  25
  26 void VariadicFunctionDefCheck::check(const MatchFinder::MatchResult &Result) {
  27   const auto *FD = Result.Nodes.getNodeAs<FunctionDecl>("func");
  28
  29   diag(FD->getLocation(),
  30        "do not define a C-style variadic function; consider using a function "
  31        "parameter pack or currying instead");
  32 }
  33
  34 } // namespace clang::tidy::cert