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Diffstat (limited to 'frontend/json_frontend.cc')
-rw-r--r-- | frontend/json_frontend.cc | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/frontend/json_frontend.cc b/frontend/json_frontend.cc new file mode 100644 index 00000000..d2e6248e --- /dev/null +++ b/frontend/json_frontend.cc @@ -0,0 +1,203 @@ +/* + * 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_setting(const Json &obj, TFunc Func) const + { + const auto &settings = obj["settings"]; + if (settings.is_null()) + return; + for (const auto &setting : settings.object_items()) { + Func(setting.first, parse_property(setting.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 |