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Diffstat (limited to 'compilerplugins/clang/store/constantfunction.cxx')
| -rw-r--r-- | compilerplugins/clang/store/constantfunction.cxx | 506 |
1 files changed, 506 insertions, 0 deletions
diff --git a/compilerplugins/clang/store/constantfunction.cxx b/compilerplugins/clang/store/constantfunction.cxx new file mode 100644 index 000000000..a29556723 --- /dev/null +++ b/compilerplugins/clang/store/constantfunction.cxx @@ -0,0 +1,506 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +#include "plugin.hxx" +#include <iostream> + +/* + Look for member functions that merely return a compile-time constant, or they are empty, and can thus + be either removed, or converted into a constant. + + This mostly tends to happen as a side-effect of other cleanups. +*/ +namespace { + +class ConstantFunction: + public loplugin::FilteringPlugin<ConstantFunction> +{ + StringRef getFilename(const FunctionDecl* functionDecl); +public: + explicit ConstantFunction(InstantiationData const & data): FilteringRewritePlugin(data) {} + + void run() override + { + // these files crash clang-3.5 somewhere in the isEvaluatable/EvaluateAsXXX stuff +/* FileID mainFileID = compiler.getSourceManager().getMainFileID(); + if (strstr(compiler.getSourceManager().getFileEntryForID(mainFileID)->getName(), "bootstrapfixture.cxx") != 0) { + return; + } + if (strstr(compiler.getSourceManager().getFileEntryForID(mainFileID)->getName(), "gtk3gtkinst.cxx") != 0) { + return; + }*/ + + TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); + } + + bool VisitFunctionDecl(const FunctionDecl *); +}; + +StringRef ConstantFunction::getFilename(const FunctionDecl* functionDecl) +{ + SourceLocation spellingLocation = compiler.getSourceManager().getSpellingLoc(functionDecl->getCanonicalDecl()->getNameInfo().getLoc()); + StringRef name { getFilenameOfLocation(spellingLocation) }; + return name; +} + +static bool startsWith(const std::string& rStr, const char* pSubStr) { + return rStr.compare(0, strlen(pSubStr), pSubStr) == 0; +} + +bool ConstantFunction::VisitFunctionDecl(const FunctionDecl * pFunctionDecl) { + if (ignoreLocation(pFunctionDecl)) { + return true; + } + if (!pFunctionDecl->hasBody()) { + return true; + } + if (!pFunctionDecl->isThisDeclarationADefinition()) { + return true; + } + // stuff declared extern-C is almost always used as a some kind of callback + if (pFunctionDecl->isExternC()) { + return true; + } + if (pFunctionDecl->isConstexpr()) { + return true; + } + if (pFunctionDecl->isMain()) { + return true; + } + + StringRef aFileName = getFilename(pFunctionDecl); + + // various tests in here are empty stubs under Linux + if (aFileName.startswith(SRCDIR "/sal/qa/")) { + return true; + } + // lots of empty stuff here where it looks like someone is still going to "fill in the blanks" + if (aFileName.startswith(SRCDIR "/basegfx/test/")) { + return true; + } + // bridges has some weird stuff in it... + if (aFileName.startswith(SRCDIR "/bridges/")) { + return true; + } + // dummy implementation of DDE, since it is only active on Windows + if (aFileName == SRCDIR "/svl/unx/source/svdde/ddedummy.cxx" + || aFileName == SRCDIR "/include/svl/svdde.hxx") { + return true; + } + // fancy templates at work here + if (aFileName == SRCDIR "/vcl/source/gdi/bmpfast.cxx") { + return true; + } + // bunch of stuff used as callbacks here + if (aFileName == SRCDIR "/vcl/generic/glyphs/gcach_layout.cxx") { + return true; + } + // salplug runtime-loading mechanism at work + if (aFileName == SRCDIR "/vcl/inc/salinst.hxx") { + return true; + } + // lots of callbacks here + if (aFileName == SRCDIR "/extensions/source/plugin/unx/npnapi.cxx") { + return true; + } + // vcl/unx/gtk3 re-using vcl/unx/gtk: + if (aFileName.find("/../../gtk/") != std::string::npos) { + return true; + } + // used by code generated by python + if (aFileName == SRCDIR "/writerfilter/source/ooxml/OOXMLFastContextHandler.hxx") { + return true; + } + // this test just test the include of some headers + if (aFileName == SRCDIR "/officecfg/qa/cppheader.cxx") { + return true; + } + // just ignore this for now, people furiously hacking in there + if (startsWith(aFileName, SRCDIR "/libreofficekit")) { + return true; + } + + + const CXXMethodDecl *pCXXMethodDecl = dyn_cast<CXXMethodDecl>(pFunctionDecl); + if (pCXXMethodDecl) { + if (pCXXMethodDecl->isVirtual()) { + return true; + } + // static with inline body will be optimised at compile-time to a constant anyway + if (pCXXMethodDecl->isStatic() && (pCXXMethodDecl->hasInlineBody() || pCXXMethodDecl->isInlineSpecified())) { + return true; + } + // this catches some stuff in templates + if (pFunctionDecl->hasAttr<OverrideAttr>()) { + return true; + } + } + // a free function with an inline body will be optimised at compile-time to a constant anyway + if (!pCXXMethodDecl && pFunctionDecl->isInlineSpecified()) { + return true; + } + if (isa<CXXConstructorDecl>(pFunctionDecl) || isa<CXXDestructorDecl>(pFunctionDecl) || isa<CXXConversionDecl>(pFunctionDecl)) { + return true; + } + if (isInUnoIncludeFile(pFunctionDecl)) { + return true; + } + + switch (pFunctionDecl->getOverloadedOperator()) { + case OO_Delete: + case OO_EqualEqual: + case OO_Call: + return true; + default: + break; + } + + std::string aFunctionName = pFunctionDecl->getQualifiedNameAsString(); + + // something to do with dynamic loading in sal/textenc/textenc.cxx + if (aFunctionName == "thisModule") { + return true; + } + // an empty stub under certain conditions, sal/osl/unx/thread.cxx + if (aFunctionName == "osl_thread_priority_init_Impl") { + return true; + } + // a pointer to this function is taken and passed to an underlying API, cppu/source/uno/lbenv.cxx + if (aFunctionName == "defenv_dispose") { + return true; + } + // a pointer to this function is taken and passed to an underlying API, cppuhelper/source/exc_thrower.cxx + if (aFunctionName == "ExceptionThrower_acquire_release_nop") { + return true; + } + // used as a callback, /vcl/source/filter/jpeg/JpegReader.cxx + if (aFunctionName == "term_source") { + return true; + } + // only valid for windows, extensions/source/update/check/updatecheck.cxx + if (aFunctionName == "(anonymous namespace)::UpdateCheckThread::hasInternetConnection") { + return true; + } + // used as callback, extensions/source/plugin/unx/npwrap.cxx + if (aFunctionName == "plugin_x_error_handler" || aFunctionName == "noClosure") { + return true; + } + // used as callback, sax/source/expatwrap/sax_expat.cxx + if (aFunctionName == "(anonymous namespace)::SaxExpatParser_Impl::callbackUnknownEncoding") { + return true; + } + // used as callback, i18npool/source/textconversion/textconversion.cxx + if (aFunctionName == "com::sun::star::i18n::nullFunc") { + return true; + } + // used as callback, xmloff/source/text/txtparae.cxx + if (aFunctionName == "(anonymous namespace)::lcl_TextContentsUnfiltered") { + return true; + } + // template magic, include/canvas/verifyinput.hxx + if (aFunctionName == "canvas::tools::verifyInput") { + return true; + } + // template magic, cppcanvas/source/mtfrenderer/implrenderer.cxx + if (aFunctionName == "cppcanvas::internal::(anonymous namespace)::AreaQuery::result") { + return true; + } + // callback, drawinglayer/source/dumper/XShapeDumper. + if (aFunctionName == "(anonymous namespace)::closeCallback") { + return true; + } + // callback, basic/source/runtime/runtime.cxx + if (aFunctionName == "SbiRuntime::StepNOP") { + return true; + } + // DLL stuff, only used on windows, basic/source/runtime/dllmgr.hxx + if (aFunctionName == "SbiDllMgr::FreeDll") { + return true; + } + // only used on Windows, basic/source/sbx/sbxdec.cxx + if (aFunctionName == "SbxDecimal::neg" || aFunctionName == "SbxDecimal::isZero") { + return true; + } + // used as a callback, include/sfx2/shell.hxx + if (aFunctionName == "SfxShell::EmptyExecStub" || aFunctionName == "SfxShell::EmptyStateStub" + || aFunctionName == "SfxShell::VerbState") { + return true; + } + // SFX_IMPL_POS_CHILDWINDOW_WITHID macro + if (aFunctionName.find("GetChildWindowId") != std::string::npos) { + return true; + } + // SFX_IMPL_SUPERCLASS_INTERFACE macro + if (aFunctionName.find("InitInterface_Impl") != std::string::npos) { + return true; + } + // callback, vcl/unx/generic/app/sm.cxx + if (aFunctionName == "IgnoreIceIOErrors" || aFunctionName == "IgnoreIceErrors") { + return true; + } + // callback, vcl/unx/gtk/a11y/atkcomponent.cxx + if (aFunctionName == "component_wrapper_get_mdi_zorder") { + return true; + } + // callback, vcl/unx/gtk/a11y/atkaction.cxx + if (aFunctionName == "action_wrapper_set_description") { + return true; + } + // callback, vcl/unx/gtk/a11y/atkutil.cxx + if (aFunctionName == "ooo_atk_util_get_toolkit_version" || aFunctionName == "ooo_atk_util_get_toolkit_name") { + return true; + } + // callback, vcl/unx/gtk/a11y/atktextattributes.cxx + if (aFunctionName == "InvalidValue") { + return true; + } + // callback, vcl/unx/gtk/a11y/atktable.cxx + if (aFunctionName == "table_wrapper_set_summary" || aFunctionName == "table_wrapper_set_row_header" + || aFunctionName == "table_wrapper_set_row_description" + || aFunctionName == "table_wrapper_set_column_header" + || aFunctionName == "table_wrapper_set_column_description" + || aFunctionName == "table_wrapper_set_caption") { + return true; + } + // callbacks, vcl/unx/gtk/window/gtksalframe.cxx + if (startsWith(aFunctionName, "GtkSalFrame::IMHandler::signal")) { + return true; + } + // callbacks, vcl/unx/gtk/window/glomenu.cxx + if (startsWith(aFunctionName, "g_lo_menu_is_mutable")) { + return true; + } + // only contains code for certain versions of GTK, /vcl/unx/gtk/window/gtksalframe.cx + if (aFunctionName == "GtkSalFrame::AllocateFrame") { + return true; + } + // only valid for Windows, embeddedobj/source/msole/olemisc.cxx + if (aFunctionName == "OleEmbeddedObject::GetRidOfComponent") { + return true; + } + // callback, svx/source/accessibility/ShapeTypeHandler.cxx + if (aFunctionName == "accessibility::CreateEmptyShapeReference") { + return true; + } + // chart2/source/view/main/AbstractShapeFactory.cxx + if (aFunctionName == "chart::(anonymous namespace)::thisModule") { + return true; + } + // chart2/source/tools/InternalData.cxx + if (aFunctionName == "chart::InternalData::dump") { + return true; + } + // hwpfilter/ + if (aFunctionName == "debug" || aFunctionName == "token_debug") { + return true; + } + // callback, sdext/source/presenter/PresenterFrameworkObserver.cxx + if (aFunctionName == "sdext::presenter::PresenterFrameworkObserver::True") { + return true; + } + // callback, sw/source/core/doc/tblrwcl.cxx + if (aFunctionName == "lcl_DelOtherBox") { + return true; + } + // callback, sw/source/filter/ww8/ww8par.cxx + if (aFunctionName == "SwWW8ImplReader::Read_Majority") { + return true; + } + // callback, sw/source/filter/ww8/ww8par5.cxx + if (aFunctionName == "SwWW8ImplReader::Read_F_Shape") { + return true; + } + // called from SDI file, I don't know what that stuff is about, sd/source/ui/slidesorter/shell/SlideSorterViewShell.cx + if (aFunctionName == "sd::slidesorter::SlideSorterViewShell::ExecStatusBar" + || aFunctionName == "sd::OutlineViewShell::ExecStatusBar") { + return true; + } + // only used in debug mode, sd/source/filter/ppt/pptinanimations.cxx + if (startsWith(aFunctionName, "ppt::AnimationImporter::dump")) { + return true; + } + // only used in ENABLE_SDREMOTE_BLUETOOTH mode, sd/source/ui/dlg/tpoption.cx + if (aFunctionName == "SdTpOptionsMisc::SetImpressMode") { + return true; + } + // template magic, sc/source/ui/docshell/datastream.cxx + if (startsWith(aFunctionName, "sc::(anonymous namespace)::CSVHandler::")) { + return true; + } + // called from SDI file, I don't know what that stuff is about, sc/source/ui/view/cellsh4.cxx + if (aFunctionName == "ScCellShell::GetStateCursor") { + return true; + } + // template magic, sc/source/filter/excel/xepivot.cxx + if (aFunctionName == "XclExpPivotCache::SaveXml") { + return true; + } + // template magic, sc/source/filter/html/htmlpars.cxx + if (startsWith(aFunctionName, "(anonymous namespace)::CSSHandler::")) { + return true; + } + // callbacks, sc/source/filter/oox/formulaparser.cxx + if (startsWith(aFunctionName, "oox::xls::BiffFormulaParserImpl::import")) { + return true; + } + // template magic, sc/qa/unit/helper/csv_handler.hxx + if (startsWith(aFunctionName, "csv_handler::") || startsWith(aFunctionName, "conditional_format_handler::")) { + return true; + } + // template magic, slideshow/source/inc/listenercontainer.hxx + if (startsWith(aFunctionName, "slideshow::internal::EmptyBase::EmptyClearableGuard::")) { + return true; + } + // callback, scripting/source/vbaevents/eventhelper.cxx + if (aFunctionName == "ApproveAll") { + return true; + } + // only on WNT, basic/qa/cppunit/test_vba.cx + if (aFunctionName == "(anonymous namespace)::VBATest::testMiscOLEStuff") { + return true; + } + // GtkSalFrame::TriggerPaintEvent() is only compiled under certain versions of GTK + if (aFunctionName == "GtkSalFrame::TriggerPaintEvent") { + return true; + } + if (aFunctionName == "SwVectorModifyBase::dumpAsXml") { + return true; + } + // vcl/unx/gtk3 re-using vcl/unx/gtk: + if (aFunctionName == "DeInitAtkBridge" + || aFunctionName == "GtkData::initNWF" + || aFunctionName == "GtkSalFrame::EnsureAppMenuWatch" + || aFunctionName == "InitAtkBridge") + { + return true; + } + if (aFunctionName == "sc::AlignedAllocator::operator!=") { + return true; + } + if (aFunctionName == "clipboard_owner_init") { + return true; + } + // returns sizeof(struct) vcl/source/gdi/dibtools.cxx + if (aFunctionName == "getDIBV5HeaderSize") { + return true; + } + // windows only + if (aFunctionName == "InitAccessBridge") { + return true; + } + // callbacks + if (aFunctionName == "disabled_initSystray" || aFunctionName == "disabled_deInitSystray") { + return true; + } + // behind a BREAKPAD option + if (aFunctionName == "desktop::(anonymous namespace)::crashReportInfoExists") { + return true; + } + // LOK stuff + if (aFunctionName == "doc_getTileMode") { + return true; + } + // apparently this will be useful at sometime in the future + if (aFunctionName == "LocaleDataWrapper::getCurrZeroChar") { + return true; + } + // marked with TODO + if (aFunctionName == "oglcanvas::TextLayout::draw") { + return true; + } + // called from the .sdi files + if (aFunctionName == "SfxObjectShell::StateView_Impl") { + return true; + } + // gtk callback + if (aFunctionName == "GtkSalFrame::signalVisibility") { + return true; + } + // platform-version-dependent code + if (aFunctionName == "(anonymous namespace)::ACTIVE_TAB") { + return true; + } + // SMIL callbacks + if (aFunctionName == "boost::sp_scalar_constructor_hook" || aFunctionName == "boost::sp_scalar_destructor_hook") { + return true; + } + + + + + std::string aImmediateMacro = ""; + if (compiler.getSourceManager().isMacroBodyExpansion(pFunctionDecl->getLocStart()) ) { + StringRef name { Lexer::getImmediateMacroName( + pFunctionDecl->getLocStart(), compiler.getSourceManager(), compiler.getLangOpts()) }; + aImmediateMacro = name; + if (name.startswith("IMPL_LINK_") ) + { + return true; + } + } + + const CompoundStmt *pCompoundStmt = dyn_cast<CompoundStmt>(pFunctionDecl->getBody()); + bool bEmptyBody = false; + if (pCompoundStmt) { + if (pCompoundStmt->size() > 1) { + return true; + } + if (pCompoundStmt->size() > 0) { + const ReturnStmt *pReturnStmt = dyn_cast<ReturnStmt>(*pCompoundStmt->body_begin()); + if (!pReturnStmt) { + return true; + } + if (const UnaryOperator* unaryOp = dyn_cast<UnaryOperator>(pReturnStmt->getRetValue())) { + if (unaryOp->getOpcode() == UO_AddrOf) { + return true; + } + } + if (pReturnStmt->getRetValue() != nullptr) { + // && !pReturnStmt->getRetValue()->isEvaluatable(compiler.getASTContext())) { + bool aBoolResult; + llvm::APSInt aIntResult; + if (pReturnStmt->getRetValue()->isTypeDependent() + || (!pReturnStmt->getRetValue()->EvaluateAsBooleanCondition(aBoolResult, compiler.getASTContext()) + && !pReturnStmt->getRetValue()->EvaluateAsInt(aIntResult, compiler.getASTContext()))) + { + return true; + } + } + } else { + bEmptyBody = true; + } + } + + std::string aMessage = "this "; + aMessage += pCXXMethodDecl ? "method" : "function"; + if (bEmptyBody) { + aMessage += " is empty and should be removed, " + aFunctionName; + } else { + aMessage += " returns a constant value and should be converted to a constant " + "or to static inline, " + aFunctionName + ", " + aImmediateMacro; + } + report( + DiagnosticsEngine::Warning, + aMessage, + pFunctionDecl->getLocStart()) + << pFunctionDecl->getSourceRange(); + if (pFunctionDecl != pFunctionDecl->getCanonicalDecl()) + report( + DiagnosticsEngine::Note, + aMessage, + pFunctionDecl->getCanonicalDecl()->getLocStart()) + << pFunctionDecl->getCanonicalDecl()->getSourceRange(); + return true; +} + +loplugin::Plugin::Registration<ConstantFunction> X("constantfunction"); + +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |