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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: */
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