abc0344a23
and move the duplicated hasExternalLinkage function to a common location Change-Id: I39a1990945666ff7a307b4ddd5e270da64ee1673 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/88592 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
95 lines
3 KiB
C++
95 lines
3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef LO_CLANG_SHARED_PLUGINS
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#include "check.hxx"
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#include "plugin.hxx"
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// Find variable declarations at namespace scope that need not have external
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// linkage.
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namespace {
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class ExternVar: public loplugin::FilteringPlugin<ExternVar>
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{
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public:
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explicit ExternVar(loplugin::InstantiationData const & data): FilteringPlugin(data)
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{}
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void run() override
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{ TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
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bool VisitVarDecl(VarDecl const * decl) {
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if (ignoreLocation(decl)) {
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return true;
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}
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if (decl->isStaticDataMember()) {
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return true;
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}
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if (!(decl->isFirstDecl()
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&& compiler.getSourceManager().isInMainFile(decl->getLocation())
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&& loplugin::hasExternalLinkage(decl)))
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{
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return true;
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}
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auto def = decl->getDefinition();
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if (def == nullptr) {
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// Code like
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//
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// namespace { extern int v; }
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// int f() { return sizeof(v); }
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//
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// is already handled by Clang itself with an error "variable 'v' is
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// not needed and will not be emitted"
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return true;
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}
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if (loplugin::DeclCheck(def).Var("_pRawDllMain").GlobalNamespace()) {
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return true;
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}
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SourceLocation argLoc;
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if (compiler.getSourceManager().isMacroArgExpansion(def->getLocation(), &argLoc)
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&& (Lexer::getImmediateMacroName(
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argLoc, compiler.getSourceManager(), compiler.getLangOpts())
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== "DEFINE_GUID"))
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{
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return true;
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}
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report(
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DiagnosticsEngine::Warning,
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"variable with external linkage not declared in an include file",
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def->getLocation())
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<< def->getSourceRange();
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report(
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DiagnosticsEngine::Note,
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("should either have internal linkage or be declared in an include"
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" file"),
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def->getLocation())
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<< def->getSourceRange();
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for (auto prev = def;;) {
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prev = prev->getPreviousDecl();
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if (prev == nullptr) {
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break;
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}
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report(
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DiagnosticsEngine::Note, "previously declared here",
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prev->getLocation())
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<< prev->getSourceRange();
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}
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return true;
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}
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};
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loplugin::Plugin::Registration<ExternVar> externvar("externvar");
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}
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#endif // LO_CLANG_SHARED_PLUGINS
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/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
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