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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:06:44 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:06:44 +0000
commited5640d8b587fbcfed7dd7967f3de04b37a76f26 (patch)
tree7a5f7c6c9d02226d7471cb3cc8fbbf631b415303 /compilerplugins/clang/store/removevirtuals.cxx
parentInitial commit. (diff)
downloadlibreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.tar.xz
libreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.zip
Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'compilerplugins/clang/store/removevirtuals.cxx')
-rw-r--r--compilerplugins/clang/store/removevirtuals.cxx150
1 files changed, 150 insertions, 0 deletions
diff --git a/compilerplugins/clang/store/removevirtuals.cxx b/compilerplugins/clang/store/removevirtuals.cxx
new file mode 100644
index 000000000..1dc98304d
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+++ b/compilerplugins/clang/store/removevirtuals.cxx
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+/* -*- 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 <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 "unnecessaryvirtuals" clang plugin.
+*/
+
+namespace {
+
+class RemoveVirtuals:
+ public loplugin::FilteringRewritePlugin<RemoveVirtuals>
+{
+public:
+ explicit RemoveVirtuals(InstantiationData const & data);
+ ~RemoveVirtuals();
+
+ virtual void run() override { TraverseDecl(compiler.getASTContext().getTranslationUnitDecl()); }
+
+ bool VisitCXXMethodDecl( const CXXMethodDecl* 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;
+}
+
+RemoveVirtuals::RemoveVirtuals(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 | MAP_POPULATE, mmapFD, 0));
+ assert(mmappedData != NULL);
+}
+
+RemoveVirtuals::~RemoveVirtuals()
+{
+ //Cleanup
+ int rc = munmap(mmappedData, mmapFilesize);
+ assert(rc == 0);
+ close(mmapFD);
+}
+
+std::string niceName(const CXXMethodDecl* functionDecl)
+{
+ std::string s =
+ functionDecl->getParent()->getQualifiedNameAsString() + "::"
+ + functionDecl->getReturnType().getAsString() + "-"
+ + functionDecl->getNameAsString() + "(";
+ for (const ParmVarDecl *pParmVarDecl : functionDecl->params()) {
+ s += pParmVarDecl->getType().getAsString();
+ s += ",";
+ }
+ s += ")";
+ if (functionDecl->isConst()) {
+ s += "const";
+ }
+ return s;
+}
+
+bool RemoveVirtuals::VisitCXXMethodDecl( const CXXMethodDecl* functionDecl )
+{
+ if (rewriter == nullptr) {
+ return true;
+ }
+ if (ignoreLocation(functionDecl)) {
+ return true;
+ }
+ // ignore stuff that forms part of the stable URE interface
+ if (isInUnoIncludeFile(functionDecl)) {
+ return true;
+ }
+
+ // don't mess with templates
+ if (functionDecl->getParent()->getDescribedClassTemplate() != nullptr) {
+ return true;
+ }
+ if (functionDecl->getTemplatedKind() != FunctionDecl::TK_NonTemplate) {
+ return true;
+ }
+
+ if (!functionDecl->isVirtualAsWritten()) {
+ return true;
+ }
+ std::string aNiceName = "\n" + niceName(functionDecl) + "\n";
+ const char *aNiceNameStr = aNiceName.c_str();
+ char* found = std::search(mmappedData, mmappedData + mmapFilesize, aNiceNameStr, aNiceNameStr + strlen(aNiceNameStr));
+ if(!(found < mmappedData + mmapFilesize)) {
+ return true;
+ }
+ if (functionDecl->isPure()) {
+ if (!removeText(functionDecl->getSourceRange())) {
+ report(
+ DiagnosticsEngine::Warning,
+ "Could not remove unused pure virtual method",
+ functionDecl->getLocStart())
+ << functionDecl->getSourceRange();
+ }
+ } else {
+ std::string aOrigText = rewriter->getRewrittenText(functionDecl->getSourceRange());
+ size_t iVirtualTokenIndex = aOrigText.find_first_of("virtual ");
+ if (iVirtualTokenIndex == std::string::npos) {
+ return true;
+ }
+ if (!replaceText(functionDecl->getSourceRange(), aOrigText.replace(iVirtualTokenIndex, strlen("virtual "), ""))) {
+ report(
+ DiagnosticsEngine::Warning,
+ "Could not remove virtual qualifier from method",
+ functionDecl->getLocStart())
+ << functionDecl->getSourceRange();
+ }
+ }
+ return true;
+}
+
+
+loplugin::Plugin::Registration< RemoveVirtuals > X("removevirtuals", false);
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */