forked from OSchip/llvm-project
60 lines
2.3 KiB
C++
60 lines
2.3 KiB
C++
//===--- InterfacesGlobalInitCheck.cpp - clang-tidy------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "InterfacesGlobalInitCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace cppcoreguidelines {
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void InterfacesGlobalInitCheck::registerMatchers(MatchFinder *Finder) {
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const auto GlobalVarDecl =
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varDecl(hasGlobalStorage(),
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hasDeclContext(anyOf(translationUnitDecl(), // Global scope.
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namespaceDecl(), // Namespace scope.
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recordDecl())), // Class scope.
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unless(isConstexpr()));
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const auto ReferencesUndefinedGlobalVar = declRefExpr(hasDeclaration(
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varDecl(GlobalVarDecl, unless(isDefinition())).bind("referencee")));
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Finder->addMatcher(
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traverse(TK_AsIs, varDecl(GlobalVarDecl, isDefinition(),
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hasInitializer(expr(hasDescendant(
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ReferencesUndefinedGlobalVar))))
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.bind("var")),
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this);
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}
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void InterfacesGlobalInitCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *const Var = Result.Nodes.getNodeAs<VarDecl>("var");
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// For now assume that people who write macros know what they're doing.
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if (Var->getLocation().isMacroID())
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return;
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const auto *const Referencee = Result.Nodes.getNodeAs<VarDecl>("referencee");
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// If the variable has been defined, we're good.
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const auto *const ReferenceeDef = Referencee->getDefinition();
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if (ReferenceeDef != nullptr &&
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Result.SourceManager->isBeforeInTranslationUnit(
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ReferenceeDef->getLocation(), Var->getLocation())) {
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return;
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}
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diag(Var->getLocation(),
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"initializing non-local variable with non-const expression depending on "
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"uninitialized non-local variable %0")
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<< Referencee;
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}
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} // namespace cppcoreguidelines
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} // namespace tidy
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} // namespace clang
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