clang-tools 20.0.0git
LimitedRandomnessCheck.cpp
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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
10#include "clang/AST/ASTContext.h"
11#include "clang/ASTMatchers/ASTMatchFinder.h"
12
13using namespace clang::ast_matchers;
14
15namespace clang::tidy::cert {
16
18 Finder->addMatcher(callExpr(callee(functionDecl(namedDecl(hasName("::rand")),
19 parameterCountIs(0))))
20 .bind("randomGenerator"),
21 this);
22}
23
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
DiagnosticBuilder diag(SourceLocation Loc, StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
Add a diagnostic with the check's name.
const LangOptions & getLangOpts() const
Returns the language options from the context.
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.