/*
 * Copyright (c) 2012, 2017 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2000-2005 The Regents of The University of Michigan
 * Copyright (c) 2008 The Hewlett-Packard Development Company
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "pybind11/embed.h"

#include "python/embedded.hh"

#include <zlib.h>

#include <cstdlib>
#include <iostream>
#include <list>

namespace py = pybind11;

namespace gem5
{

EmbeddedPython::EmbeddedPython(const char *abspath, const char *modpath,
        const unsigned char *code, int zlen, int len)
    : abspath(abspath), modpath(modpath), code(code), zlen(zlen), len(len)
{
    getList().push_back(this);
}

std::list<EmbeddedPython *> &
EmbeddedPython::getList()
{
    static std::list<EmbeddedPython *> the_list;
    return the_list;
}

/*
 * Uncompress and unmarshal the code object stored in the
 * EmbeddedPython
 */
py::object
EmbeddedPython::getCode() const
{
    Bytef marshalled[len];
    uLongf unzlen = len;
    int ret = uncompress(marshalled, &unzlen, (const Bytef *)code, zlen);
    if (ret != Z_OK) {
        std::cerr << "Could not uncompress code: " << zError(ret) << std::endl;
        std::abort();
    }
    assert(unzlen == (uLongf)len);

    auto marshal = py::module_::import("marshal");
    return marshal.attr("loads")(py::bytes((char *)marshalled, len));
}

bool
EmbeddedPython::addModule() const
{
    auto importer = py::module_::import("importer");
    importer.attr("add_module")(abspath, modpath, getCode());
    return true;
}

/*
 * Load and initialize all of the python parts of M5.
 */
int
EmbeddedPython::initAll()
{
    // Load the embedded python files into the embedded python importer.
    for (auto *embedded: getList()) {
        if (!embedded->addModule())
            return 1;
    }
    return 0;
}

} // namespace gem5