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//===--- DynamicStaticInitializersCheck.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 "DynamicStaticInitializersCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace bugprone {
AST_MATCHER(clang::VarDecl, hasConstantDeclaration) {
const Expr *Init = Node.getInit();
if (Init && !Init->isValueDependent()) {
if (Node.isConstexpr())
return true;
return Node.evaluateValue();
}
return false;
}
DynamicStaticInitializersCheck::DynamicStaticInitializersCheck(StringRef Name,
ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
RawStringHeaderFileExtensions(Options.getLocalOrGlobal(
"HeaderFileExtensions", utils::defaultHeaderFileExtensions())) {
if (!utils::parseFileExtensions(RawStringHeaderFileExtensions,
HeaderFileExtensions,
utils::defaultFileExtensionDelimiters())) {
this->configurationDiag("Invalid header file extension: '%0'")
<< RawStringHeaderFileExtensions;
}
}
void DynamicStaticInitializersCheck::storeOptions(
ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "HeaderFileExtensions", RawStringHeaderFileExtensions);
}
void DynamicStaticInitializersCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
varDecl(hasGlobalStorage(), unless(hasConstantDeclaration())).bind("var"),
this);
}
void DynamicStaticInitializersCheck::check(const MatchFinder::MatchResult &Result) {
const auto *Var = Result.Nodes.getNodeAs<VarDecl>("var");
SourceLocation Loc = Var->getLocation();
if (!Loc.isValid() || !utils::isPresumedLocInHeaderFile(Loc, *Result.SourceManager,
HeaderFileExtensions))
return;
// If the initializer is a constant expression, then the compiler
// doesn't have to dynamically initialize it.
diag(Loc, "static variable %0 may be dynamically initialized in this header file")
<< Var;
}
} // namespace bugprone
} // namespace tidy
} // namespace clang
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