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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/.
*/
#if !defined _WIN32 //TODO, #include <sys/mman.h>
#include <cassert>
#include <string>
#include <iostream>
#include "config_clang.h"
#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) + ")",
fieldDecl->getBeginLoc())
<< fieldDecl->getSourceRange();
}
return true;
}
loplugin::Plugin::Registration< UnusedFieldsRemove > X("unusedfieldsremove", false);
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
