9f4d23c151
by checking if the current namespace decl is in our code, so we have to scan less stuff, which results in a 10% perf improvement for me Change-Id: Idf0e30d57b6d0dcd13daa9ed679c28b9d233d387 Reviewed-on: https://gerrit.libreoffice.org/58942 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
135 lines
4.2 KiB
C++
135 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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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#if !defined _WIN32 //TODO, #include <sys/mman.h>
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#include <cassert>
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#include <string>
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#include <iostream>
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#include "plugin.hxx"
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <cstring>
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/**
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This is intended to be run as the second stage of the "unusedfields" clang plugin.
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*/
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namespace {
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class UnusedFieldsRemove:
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public loplugin::FilteringRewritePlugin<UnusedFieldsRemove>
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{
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public:
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explicit UnusedFieldsRemove(loplugin::InstantiationData const & data);
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~UnusedFieldsRemove();
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virtual void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
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bool VisitFieldDecl( const FieldDecl* var );
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private:
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// I use a brute-force approach - mmap the results file and do a linear search on it
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// It works surprisingly well, because the file is small enough to fit into L2 cache on modern CPU's
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size_t mmapFilesize;
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int mmapFD;
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char* mmappedData;
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};
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size_t getFilesize(const char* filename)
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{
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struct stat st;
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stat(filename, &st);
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return st.st_size;
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}
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UnusedFieldsRemove::UnusedFieldsRemove(loplugin::InstantiationData const & data): FilteringRewritePlugin(data)
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{
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static const char sInputFile[] = SRCDIR "/result.txt";
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mmapFilesize = getFilesize(sInputFile);
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//Open file
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mmapFD = open(sInputFile, O_RDONLY, 0);
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assert(mmapFD != -1);
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//Execute mmap
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mmappedData = static_cast<char*>(mmap(NULL, mmapFilesize, PROT_READ, MAP_PRIVATE, mmapFD, 0));
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assert(mmappedData != NULL);
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}
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UnusedFieldsRemove::~UnusedFieldsRemove()
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{
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//Cleanup
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int rc = munmap(mmappedData, mmapFilesize);
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assert(rc == 0);
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close(mmapFD);
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}
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std::string niceName(const FieldDecl* fieldDecl)
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{
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return fieldDecl->getParent()->getQualifiedNameAsString() + " " +
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fieldDecl->getNameAsString();
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}
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bool UnusedFieldsRemove::VisitFieldDecl( const FieldDecl* fieldDecl )
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{
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if (rewriter == nullptr) {
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return true;
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}
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if (ignoreLocation(fieldDecl)) {
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return true;
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}
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// ignore stuff that forms part of the stable URE interface
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if (isInUnoIncludeFile(compiler.getSourceManager().getSpellingLoc(
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fieldDecl->getCanonicalDecl()->getLocation()))) {
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return true;
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}
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// don't mess with templates
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/* if (isa<CXXRecordDecl>(fieldDecl->getParent())) {
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if (dyn_cast<CXXRecordDecl>(fieldDecl->getParent())->getDescribedClassTemplate() != nullptr) {
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return true;
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}
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}
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*/
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std::string aNiceName = " " + niceName(fieldDecl) + "\n";
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const char *aNiceNameStr = aNiceName.c_str();
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char* found = std::search(mmappedData, mmappedData + mmapFilesize, aNiceNameStr, aNiceNameStr + strlen(aNiceNameStr));
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if(!(found < mmappedData + mmapFilesize)) {
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return true;
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}
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SourceRange replaceRange(fieldDecl->getSourceRange());
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// sometimes the declaration has a semicolon just after it, and it's much neater to remove that too.
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if (rewriter->getRewrittenText(SourceRange(replaceRange.getEnd(), replaceRange.getEnd().getLocWithOffset(1))) == ";") {
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replaceRange.setEnd(replaceRange.getEnd().getLocWithOffset(1));
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}
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// remove leading spaces
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while (rewriter->getRewrittenText(SourceRange(replaceRange.getBegin().getLocWithOffset(-1), replaceRange.getBegin())) == " ")
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{
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replaceRange.setBegin(replaceRange.getBegin().getLocWithOffset(-1));
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}
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if (!replaceText(replaceRange, "")) {
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report(
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DiagnosticsEngine::Warning,
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"Could not remove unused field (" + niceName(fieldDecl) + ")",
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compat::getBeginLoc(fieldDecl))
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<< fieldDecl->getSourceRange();
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}
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return true;
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}
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loplugin::Plugin::Registration< UnusedFieldsRemove > X("unusedfieldsremove", false);
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}
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#endif
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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