34 lines · cpp
1//===----------------------------------------------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "PredictableRandCheck.h"10#include "clang/AST/ASTContext.h"11#include "clang/ASTMatchers/ASTMatchFinder.h"12 13using namespace clang::ast_matchers;14 15namespace clang::tidy::misc {16 17void PredictableRandCheck::registerMatchers(MatchFinder *Finder) {18 Finder->addMatcher(callExpr(callee(functionDecl(namedDecl(hasName("::rand")),19 parameterCountIs(0))))20 .bind("randomGenerator"),21 this);22}23 24void PredictableRandCheck::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::misc34