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::tidy::cert { 16 registerMatchers(MatchFinder * Finder)17void LimitedRandomnessCheck::registerMatchers(MatchFinder *Finder) { 18 Finder->addMatcher(callExpr(callee(functionDecl(namedDecl(hasName("::rand")), 19 parameterCountIs(0)))) 20 .bind("randomGenerator"), 21 this); 22 } 23 check(const MatchFinder::MatchResult & Result)24void LimitedRandomnessCheck::check(const MatchFinder::MatchResult &Result) { 25 std::string Msg; 26 if (getLangOpts().CPlusPlus) 27 Msg = "; use C++11 random library instead"; 28 29 const auto *MatchedDecl = Result.Nodes.getNodeAs<CallExpr>("randomGenerator"); 30 diag(MatchedDecl->getBeginLoc(), "rand() has limited randomness" + Msg); 31 } 32 33 } // namespace clang::tidy::cert 34