NoMallocCheck.cpp
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//===--- NoMallocCheck.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 "NoMallocCheck.h"
#include "../utils/Matchers.h"
#include "../utils/OptionsUtils.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include <algorithm>
#include <string>
#include <vector>
using namespace clang::ast_matchers;
using namespace clang::ast_matchers::internal;
namespace clang {
namespace tidy {
namespace cppcoreguidelines {
namespace {
Matcher<FunctionDecl> hasAnyListedName(const std::string &FunctionNames) {
const std::vector<std::string> NameList =
utils::options::parseStringList(FunctionNames);
return hasAnyName(std::vector<StringRef>(NameList.begin(), NameList.end()));
}
} // namespace
void NoMallocCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "Allocations", AllocList);
Options.store(Opts, "Reallocations", ReallocList);
Options.store(Opts, "Deallocations", DeallocList);
}
void NoMallocCheck::registerMatchers(MatchFinder *Finder) {
// Registering malloc, will suggest RAII.
Finder->addMatcher(callExpr(callee(functionDecl(hasAnyListedName(AllocList))))
.bind("allocation"),
this);
// Registering realloc calls, suggest std::vector or std::string.
Finder->addMatcher(
callExpr(callee(functionDecl(hasAnyListedName(ReallocList))))
.bind("realloc"),
this);
// Registering free calls, will suggest RAII instead.
Finder->addMatcher(
callExpr(callee(functionDecl(hasAnyListedName(DeallocList))))
.bind("free"),
this);
}
void NoMallocCheck::check(const MatchFinder::MatchResult &Result) {
const CallExpr *Call = nullptr;
StringRef Recommendation;
if ((Call = Result.Nodes.getNodeAs<CallExpr>("allocation")))
Recommendation = "consider a container or a smart pointer";
else if ((Call = Result.Nodes.getNodeAs<CallExpr>("realloc")))
Recommendation = "consider std::vector or std::string";
else if ((Call = Result.Nodes.getNodeAs<CallExpr>("free")))
Recommendation = "use RAII";
assert(Call && "Unhandled binding in the Matcher");
diag(Call->getBeginLoc(), "do not manage memory manually; %0")
<< Recommendation << SourceRange(Call->getBeginLoc(), Call->getEndLoc());
}
} // namespace cppcoreguidelines
} // namespace tidy
} // namespace clang