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//===--- InterfacesGlobalInitCheck.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 "InterfacesGlobalInitCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace cppcoreguidelines {
void InterfacesGlobalInitCheck::registerMatchers(MatchFinder *Finder) {
const auto GlobalVarDecl =
varDecl(hasGlobalStorage(),
hasDeclContext(anyOf(translationUnitDecl(), // Global scope.
namespaceDecl(), // Namespace scope.
recordDecl())), // Class scope.
unless(isConstexpr()));
const auto ReferencesUndefinedGlobalVar = declRefExpr(hasDeclaration(
varDecl(GlobalVarDecl, unless(isDefinition())).bind("referencee")));
Finder->addMatcher(
varDecl(GlobalVarDecl, isDefinition(),
hasInitializer(expr(hasDescendant(ReferencesUndefinedGlobalVar))))
.bind("var"),
this);
}
void InterfacesGlobalInitCheck::check(const MatchFinder::MatchResult &Result) {
const auto *const Var = Result.Nodes.getNodeAs<VarDecl>("var");
// For now assume that people who write macros know what they're doing.
if (Var->getLocation().isMacroID())
return;
const auto *const Referencee = Result.Nodes.getNodeAs<VarDecl>("referencee");
// If the variable has been defined, we're good.
const auto *const ReferenceeDef = Referencee->getDefinition();
if (ReferenceeDef != nullptr &&
Result.SourceManager->isBeforeInTranslationUnit(
ReferenceeDef->getLocation(), Var->getLocation())) {
return;
}
diag(Var->getLocation(),
"initializing non-local variable with non-const expression depending on "
"uninitialized non-local variable %0")
<< Referencee;
}
} // namespace cppcoreguidelines
} // namespace tidy
} // namespace clang
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