/*
 * unused-funcs
 *
 * Copyright (C) 2014 xaizek.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "FuncInfo.hpp"

#include <clang/Basic/SourceLocation.h>
#include <clang/Basic/SourceManager.h>

#include <clang/AST/Decl.h>
#include <clang/AST/Expr.h>

FuncInfo::FuncInfo(const clang::FunctionDecl *func,
                   const clang::SourceManager *sm)
    :name(func->getNameAsString())
    ,lineNum(0U)
{
    processDeclaration(func, sm);
}

void
FuncInfo::processDeclaration(const clang::FunctionDecl *func,
                   const clang::SourceManager *sm)
{
    if (isFullyDeclared() || !func->isThisDeclarationADefinition()) {
        return;
    }

    clang::FullSourceLoc fullLoc(func->getNameInfo().getBeginLoc(), *sm);
    fileName = sm->getFilename(fullLoc);
    lineNum = fullLoc.getSpellingLineNumber();
}

bool
FuncInfo::isFullyDeclared() const
{
    return lineNum != 0U;
}

void
FuncInfo::registerRef(const clang::DeclRefExpr *ref,
                      const clang::SourceManager *sm)
{
    calls.push_back(RefInfo(ref, sm));
}

bool
FuncInfo::isUnused() const
{
    return calls.empty();
}

bool
FuncInfo::canBeMadeStatic() const
{
    typedef Refs::const_iterator Cit;
    for (Cit cit = calls.begin(); cit != calls.end(); ++cit) {
        if (!cit->isInThisUnit(fileName)) {
            return false;
        }
    }
    return true;
}

std::ostream &
operator<<(std::ostream &os, const FuncInfo &fi)
{
    return os << fi.fileName
              << ':'
              << fi.lineNum
              << ':'
              << fi.name;
}