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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2019 David Shah <dave@ds0.me>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "json_frontend.h"
#include "frontend_base.h"
#include "json11.hpp"
#include "log.h"
#include "nextpnr.h"
#include <streambuf>
NEXTPNR_NAMESPACE_BEGIN
using namespace json11;
struct JsonFrontendImpl
{
// See specification in frontend_base.h
JsonFrontendImpl(Json &root) : root(root){};
Json &root;
typedef const Json &ModuleDataType;
typedef const Json &ModulePortDataType;
typedef const Json &CellDataType;
typedef const Json &NetnameDataType;
typedef const Json::array &BitVectorDataType;
template <typename TFunc> void foreach_module(TFunc Func) const
{
for (const auto &mod : root.object_items())
Func(mod.first, mod.second);
}
template <typename TFunc> void foreach_port(const ModuleDataType &mod, TFunc Func) const
{
const auto &ports = mod["ports"];
if (ports.is_null())
return;
for (const auto &port : ports.object_items())
Func(port.first, port.second);
}
template <typename TFunc> void foreach_cell(const ModuleDataType &mod, TFunc Func) const
{
const auto &cells = mod["cells"];
if (cells.is_null())
return;
for (const auto &cell : cells.object_items())
Func(cell.first, cell.second);
}
template <typename TFunc> void foreach_netname(const ModuleDataType &mod, TFunc Func) const
{
const auto &netnames = mod["netnames"];
if (netnames.is_null())
return;
for (const auto &netname : netnames.object_items())
Func(netname.first, netname.second);
}
PortType lookup_portdir(const std::string &dir) const
{
if (dir == "input")
return PORT_IN;
else if (dir == "inout")
return PORT_INOUT;
else if (dir == "output")
return PORT_OUT;
else
NPNR_ASSERT_FALSE("invalid json port direction");
}
PortType get_port_dir(const ModulePortDataType &port) const
{
return lookup_portdir(port["direction"].string_value());
}
int get_array_offset(const Json &obj) const
{
auto offset = obj["offset"];
return offset.is_null() ? 0 : offset.int_value();
}
bool is_array_upto(const Json &obj) const
{
auto upto = obj["upto"];
return upto.is_null() ? false : bool(upto.int_value());
}
const BitVectorDataType &get_port_bits(const ModulePortDataType &port) const { return port["bits"].array_items(); }
const std::string &get_cell_type(const CellDataType &cell) const { return cell["type"].string_value(); }
Property parse_property(const Json &val) const
{
if (val.is_number())
return Property(val.int_value(), 32);
else
return Property::from_string(val.string_value());
}
template <typename TFunc> void foreach_attr(const Json &obj, TFunc Func) const
{
const auto &attrs = obj["attributes"];
if (attrs.is_null())
return;
for (const auto &attr : attrs.object_items()) {
Func(attr.first, parse_property(attr.second));
}
}
template <typename TFunc> void foreach_param(const Json &obj, TFunc Func) const
{
const auto ¶ms = obj["parameters"];
if (params.is_null())
return;
for (const auto ¶m : params.object_items()) {
Func(param.first, parse_property(param.second));
}
}
template <typename TFunc> void foreach_port_dir(const CellDataType &cell, TFunc Func) const
{
for (const auto &pdir : cell["port_directions"].object_items())
Func(pdir.first, lookup_portdir(pdir.second.string_value()));
}
template <typename TFunc> void foreach_port_conn(const CellDataType &cell, TFunc Func) const
{
for (const auto &pconn : cell["connections"].object_items())
Func(pconn.first, pconn.second.array_items());
}
const BitVectorDataType &get_net_bits(const NetnameDataType &net) const { return net["bits"].array_items(); }
int get_vector_length(const BitVectorDataType &bits) const { return int(bits.size()); }
bool is_vector_bit_constant(const BitVectorDataType &bits, int i) const
{
NPNR_ASSERT(i < int(bits.size()));
return bits[i].is_string();
}
char get_vector_bit_constval(const BitVectorDataType &bits, int i) const
{
auto s = bits.at(i).string_value();
NPNR_ASSERT(s.size() == 1);
return s.at(0);
}
int get_vector_bit_signal(const BitVectorDataType &bits, int i) const
{
NPNR_ASSERT(bits.at(i).is_number());
return bits.at(i).int_value();
}
};
bool parse_json(std::istream &in, const std::string &filename, Context *ctx)
{
Json root;
{
if (!in)
log_error("Failed to open JSON file '%s'.\n", filename.c_str());
std::string json_str((std::istreambuf_iterator<char>(in)), std::istreambuf_iterator<char>());
std::string error;
root = Json::parse(json_str, error, JsonParse::COMMENTS);
if (root.is_null())
log_error("Failed to parse JSON file '%s': %s.\n", filename.c_str(), error.c_str());
root = root["modules"];
if (root.is_null())
log_error("JSON file '%s' doesn't look like a netlist (doesn't contain \"modules\" key)\n",
filename.c_str());
}
GenericFrontend<JsonFrontendImpl>(ctx, JsonFrontendImpl(root))();
return true;
}
NEXTPNR_NAMESPACE_END
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