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Diffstat (limited to 'compilerplugins/clang/unusedfieldsremove.cxx')
-rw-r--r-- | compilerplugins/clang/unusedfieldsremove.cxx | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/compilerplugins/clang/unusedfieldsremove.cxx b/compilerplugins/clang/unusedfieldsremove.cxx new file mode 100644 index 000000000..b8c339edc --- /dev/null +++ b/compilerplugins/clang/unusedfieldsremove.cxx @@ -0,0 +1,136 @@ +/* -*- 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/. + */ + +#if !defined _WIN32 //TODO, #include <sys/mman.h> + +#include <cassert> +#include <string> +#include <iostream> +#include "plugin.hxx" +#include <sys/mman.h> +#include <sys/types.h> +#include <fcntl.h> +#include <unistd.h> +#include <sys/stat.h> +#include <assert.h> +#include <cstring> + +/** + This is intended to be run as the second stage of the "unusedfields" clang plugin. +*/ + +namespace { + +class UnusedFieldsRemove: + public loplugin::FilteringRewritePlugin<UnusedFieldsRemove> +{ +public: + explicit UnusedFieldsRemove(loplugin::InstantiationData const & data); + ~UnusedFieldsRemove(); + + virtual void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); } + + bool VisitFieldDecl( const FieldDecl* var ); +private: + // I use a brute-force approach - mmap the results file and do a linear search on it + // It works surprisingly well, because the file is small enough to fit into L2 cache on modern CPU's + size_t mmapFilesize; + int mmapFD; + char* mmappedData; +}; + +size_t getFilesize(const char* filename) +{ + struct stat st; + stat(filename, &st); + return st.st_size; +} + +UnusedFieldsRemove::UnusedFieldsRemove(loplugin::InstantiationData const & data): FilteringRewritePlugin(data) +{ + static const char sInputFile[] = SRCDIR "/result.txt"; + mmapFilesize = getFilesize(sInputFile); + //Open file + mmapFD = open(sInputFile, O_RDONLY, 0); + assert(mmapFD != -1); + //Execute mmap + mmappedData = static_cast<char*>(mmap(NULL, mmapFilesize, PROT_READ, MAP_PRIVATE, mmapFD, 0)); + assert(mmappedData != NULL); +} + +UnusedFieldsRemove::~UnusedFieldsRemove() +{ + //Cleanup + int rc = munmap(mmappedData, mmapFilesize); + assert(rc == 0); + (void)rc; + close(mmapFD); +} + +std::string niceName(const FieldDecl* fieldDecl) +{ + return fieldDecl->getParent()->getQualifiedNameAsString() + " " + + fieldDecl->getNameAsString(); +} + +bool UnusedFieldsRemove::VisitFieldDecl( const FieldDecl* fieldDecl ) +{ + if (rewriter == nullptr) { + return true; + } + if (ignoreLocation(fieldDecl)) { + return true; + } + // ignore stuff that forms part of the stable URE interface + if (isInUnoIncludeFile(compiler.getSourceManager().getSpellingLoc( + fieldDecl->getCanonicalDecl()->getLocation()))) { + return true; + } + + // don't mess with templates +/* if (isa<CXXRecordDecl>(fieldDecl->getParent())) { + if (dyn_cast<CXXRecordDecl>(fieldDecl->getParent())->getDescribedClassTemplate() != nullptr) { + return true; + } + } +*/ + std::string aNiceName = " " + niceName(fieldDecl) + "\n"; + const char *aNiceNameStr = aNiceName.c_str(); + char* found = std::search(mmappedData, mmappedData + mmapFilesize, aNiceNameStr, aNiceNameStr + strlen(aNiceNameStr)); + if(!(found < mmappedData + mmapFilesize)) { + return true; + } + SourceRange replaceRange(fieldDecl->getSourceRange()); + // sometimes the declaration has a semicolon just after it, and it's much neater to remove that too. + if (rewriter->getRewrittenText(SourceRange(replaceRange.getEnd(), replaceRange.getEnd().getLocWithOffset(1))) == ";") { + replaceRange.setEnd(replaceRange.getEnd().getLocWithOffset(1)); + } + // remove leading spaces + while (rewriter->getRewrittenText(SourceRange(replaceRange.getBegin().getLocWithOffset(-1), replaceRange.getBegin())) == " ") + { + replaceRange.setBegin(replaceRange.getBegin().getLocWithOffset(-1)); + } + if (!replaceText(replaceRange, "")) { + report( + DiagnosticsEngine::Warning, + "Could not remove unused field (" + niceName(fieldDecl) + ")", + compat::getBeginLoc(fieldDecl)) + << fieldDecl->getSourceRange(); + } + return true; +} + + +loplugin::Plugin::Registration< UnusedFieldsRemove > X("unusedfieldsremove", false); + +} + +#endif + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |