1 //===--- LimitedRandomnessCheck.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 "LimitedRandomnessCheck.h" 10 #include "clang/AST/ASTContext.h" 11 #include "clang/ASTMatchers/ASTMatchFinder.h" 12 13 using namespace clang::ast_matchers; 14 15 namespace clang { 16 namespace tidy { 17 namespace cert { 18 registerMatchers(MatchFinder * Finder)19void LimitedRandomnessCheck::registerMatchers(MatchFinder *Finder) { 20 Finder->addMatcher(callExpr(callee(functionDecl(namedDecl(hasName("::rand")), 21 parameterCountIs(0)))) 22 .bind("randomGenerator"), 23 this); 24 } 25 check(const MatchFinder::MatchResult & Result)26void LimitedRandomnessCheck::check(const MatchFinder::MatchResult &Result) { 27 std::string msg = ""; 28 if (getLangOpts().CPlusPlus) 29 msg = "; use C++11 random library instead"; 30 31 const auto *MatchedDecl = Result.Nodes.getNodeAs<CallExpr>("randomGenerator"); 32 diag(MatchedDecl->getBeginLoc(), "rand() has limited randomness" + msg); 33 } 34 35 } // namespace cert 36 } // namespace tidy 37 } // namespace clang 38