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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 "plugin.hxx"
#include "check.hxx"
#include "config_clang.h"
#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 "constfields" clang plugin.
*/
namespace
{
class ConstFieldsRewrite : public RecursiveASTVisitor<ConstFieldsRewrite>,
public loplugin::RewritePlugin
{
public:
explicit ConstFieldsRewrite(loplugin::InstantiationData const& data);
~ConstFieldsRewrite();
virtual void run() override
{
if (rewriter)
{
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;
}
ConstFieldsRewrite::ConstFieldsRewrite(loplugin::InstantiationData const& data)
: RewritePlugin(data)
{
static const char sInputFile[] = SRCDIR "/compilerplugins/clang/constfields.results";
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);
}
ConstFieldsRewrite::~ConstFieldsRewrite()
{
//Cleanup
int rc = munmap(mmappedData, mmapFilesize);
assert(rc == 0);
(void)rc;
close(mmapFD);
}
bool ConstFieldsRewrite::VisitFieldDecl(const FieldDecl* fieldDecl)
{
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;
// in case we've already processed this field
if (fieldDecl->getType().isConstQualified())
return true;
// TODO rewriting T& is a bit trickier
if (loplugin::TypeCheck(fieldDecl->getType()).LvalueReference())
return true;
const RecordDecl* recordDecl = fieldDecl->getParent();
std::string parentClassName;
if (const CXXRecordDecl* cxxRecordDecl = dyn_cast<CXXRecordDecl>(recordDecl))
{
if (cxxRecordDecl->getTemplateInstantiationPattern())
cxxRecordDecl = cxxRecordDecl->getTemplateInstantiationPattern();
parentClassName = cxxRecordDecl->getQualifiedNameAsString();
}
else
{
parentClassName = recordDecl->getQualifiedNameAsString();
}
// the extra spaces match the formatting in the results file, and help avoid false+
std::string aNiceName = " " + parentClassName + " " + fieldDecl->getNameAsString() + " "
+ fieldDecl->getType().getAsString() + "\n";
// search mmap'ed file for field
const char* aNiceNameStr = aNiceName.c_str();
char* found = std::search(mmappedData, mmappedData + mmapFilesize, aNiceNameStr,
aNiceNameStr + aNiceName.size());
if (!(found < mmappedData + mmapFilesize))
return true;
SourceManager& SM = compiler.getSourceManager();
auto endLoc = fieldDecl->getTypeSourceInfo()->getTypeLoc().getEndLoc();
endLoc = endLoc.getLocWithOffset(Lexer::MeasureTokenLength(endLoc, SM, compiler.getLangOpts()));
// Calculate how much space is available after the type declaration that we can use to
// overwrite with the " const". This reduces the amount of formatting fixups I need to do.
char const* p1 = SM.getCharacterData(endLoc);
bool success = false;
if (*p1 != ' ')
{
// Sometimes there is no space at all e.g. in
// FastTokenHandlerBase *mpTokenHandler;
// between the "*" and the "mpTokenHandler", so add an extra space.
success = insertText(endLoc, " const ");
}
else
{
int spaceAvailable = 1;
++p1;
for (; spaceAvailable < 6; ++spaceAvailable)
{
if (*p1 != ' ')
break;
++p1;
}
if (spaceAvailable < 6)
success = replaceText(endLoc, spaceAvailable - 1, " const");
else
success = replaceText(endLoc, spaceAvailable, " const");
}
if (!success)
{
report(DiagnosticsEngine::Warning, "Could not mark field as const",
fieldDecl->getBeginLoc())
<< fieldDecl->getSourceRange();
}
return true;
}
loplugin::Plugin::Registration<ConstFieldsRewrite> X("constfieldsrewrite", false);
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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