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//===--- LimitedRandomnessCheck.cpp - clang-tidy---------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "LimitedRandomnessCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace cert {
void LimitedRandomnessCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(callExpr(callee(functionDecl(namedDecl(hasName("::rand")),
parameterCountIs(0))))
.bind("randomGenerator"),
this);
}
void LimitedRandomnessCheck::check(const MatchFinder::MatchResult &Result) {
std::string msg = "";
if (getLangOpts().CPlusPlus)
msg = "; use C++11 random library instead";
const auto *MatchedDecl = Result.Nodes.getNodeAs<CallExpr>("randomGenerator");
diag(MatchedDecl->getBeginLoc(), "rand() has limited randomness" + msg);
}
} // namespace cert
} // namespace tidy
} // namespace clang
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