1 //===--- VariadicfunctiondefCheck.cpp - clang-tidy-------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "VariadicFunctionDefCheck.h"
11 #include "clang/AST/ASTContext.h"
12 #include "clang/ASTMatchers/ASTMatchFinder.h"
13 
14 using namespace clang::ast_matchers;
15 
16 namespace clang {
17 namespace tidy {
18 namespace cert {
19 
20 void VariadicFunctionDefCheck::registerMatchers(MatchFinder *Finder) {
21   if (!getLangOpts().CPlusPlus)
22     return;
23 
24   // We only care about function *definitions* that are variadic, and do not
25   // have extern "C" language linkage.
26   Finder->addMatcher(
27       functionDecl(isDefinition(), isVariadic(), unless(isExternC()))
28           .bind("func"),
29       this);
30 }
31 
32 void VariadicFunctionDefCheck::check(const MatchFinder::MatchResult &Result) {
33   const auto *FD = Result.Nodes.getNodeAs<FunctionDecl>("func");
34 
35   diag(FD->getLocation(),
36        "do not define a C-style variadic function; consider using a function "
37        "parameter pack or currying instead");
38 }
39 
40 } // namespace cert
41 } // namespace tidy
42 } // namespace clang
43