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//===--- StaticallyConstructedObjectsCheck.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 "StaticallyConstructedObjectsCheck.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace fuchsia {
namespace {
AST_MATCHER(Expr, isConstantInitializer) {
return Node.isConstantInitializer(Finder->getASTContext(), false);
}
AST_MATCHER(VarDecl, isGlobalStatic) {
return Node.getStorageDuration() == SD_Static && !Node.isLocalVarDecl();
}
} // namespace
void StaticallyConstructedObjectsCheck::registerMatchers(MatchFinder *Finder) {
// Constructing global, non-trivial objects with static storage is
// disallowed, unless the object is statically initialized with a constexpr
// constructor or has no explicit constructor.
// Constexpr requires C++11 or later.
if (!getLangOpts().CPlusPlus11)
return;
Finder->addMatcher(varDecl(
// Match global, statically stored objects...
isGlobalStatic(),
// ... that have C++ constructors...
hasDescendant(cxxConstructExpr(unless(allOf(
// ... unless it is constexpr ...
hasDeclaration(cxxConstructorDecl(isConstexpr())),
// ... and is statically initialized.
isConstantInitializer())))))
.bind("decl"),
this);
}
void StaticallyConstructedObjectsCheck::check(
const MatchFinder::MatchResult &Result) {
if (const auto *D = Result.Nodes.getNodeAs<VarDecl>("decl"))
diag(D->getBeginLoc(), "static objects are disallowed; if possible, use a "
"constexpr constructor instead");
}
} // namespace fuchsia
} // namespace tidy
} // namespace clang
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