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yosys/backends/json/json.cc

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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* 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 "kernel/rtlil.h"
#include "kernel/register.h"
#include "kernel/sigtools.h"
#include "kernel/celltypes.h"
#include "kernel/cellaigs.h"
#include "kernel/log.h"
#include <string>
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct JsonWriter
{
std::ostream &f;
bool use_selection;
bool aig_mode;
Design *design;
Module *module;
SigMap sigmap;
int sigidcounter;
dict<SigBit, string> sigids;
pool<Aig> aig_models;
JsonWriter(std::ostream &f, bool use_selection, bool aig_mode) :
f(f), use_selection(use_selection), aig_mode(aig_mode) { }
string get_string(string str)
{
string newstr = "\"";
for (char c : str) {
if (c == '\\')
newstr += c;
newstr += c;
}
return newstr + "\"";
}
string get_name(IdString name)
{
return get_string(RTLIL::unescape_id(name));
}
string get_bits(SigSpec sig)
{
bool first = true;
string str = "[";
for (auto bit : sigmap(sig)) {
str += first ? " " : ", ";
first = false;
if (sigids.count(bit) == 0) {
string &s = sigids[bit];
if (bit.wire == nullptr) {
if (bit == State::S0) s = "\"0\"";
else if (bit == State::S1) s = "\"1\"";
else if (bit == State::Sz) s = "\"z\"";
else s = "\"x\"";
} else
s = stringf("%d", sigidcounter++);
}
str += sigids[bit];
}
return str + " ]";
}
void write_parameters(const dict<IdString, Const> &parameters, bool for_module=false)
{
bool first = true;
for (auto &param : parameters) {
f << stringf("%s\n", first ? "" : ",");
f << stringf(" %s%s: ", for_module ? "" : " ", get_name(param.first).c_str());
if ((param.second.flags & RTLIL::ConstFlags::CONST_FLAG_STRING) != 0)
f << get_string(param.second.decode_string());
else if (GetSize(param.second.bits) > 32)
f << get_string(param.second.as_string());
else
f << stringf("%d", param.second.as_int());
first = false;
}
}
void write_module(Module *module_)
{
module = module_;
log_assert(module->design == design);
sigmap.set(module);
sigids.clear();
// reserve 0 and 1 to avoid confusion with "0" and "1"
sigidcounter = 2;
f << stringf(" %s: {\n", get_name(module->name).c_str());
f << stringf(" \"attributes\": {");
write_parameters(module->attributes, /*for_module=*/true);
f << stringf("\n },\n");
f << stringf(" \"ports\": {");
bool first = true;
for (auto n : module->ports) {
Wire *w = module->wire(n);
if (use_selection && !module->selected(w))
continue;
f << stringf("%s\n", first ? "" : ",");
f << stringf(" %s: {\n", get_name(n).c_str());
f << stringf(" \"direction\": \"%s\",\n", w->port_input ? w->port_output ? "inout" : "input" : "output");
f << stringf(" \"bits\": %s\n", get_bits(w).c_str());
f << stringf(" }");
first = false;
}
f << stringf("\n },\n");
f << stringf(" \"cells\": {");
first = true;
for (auto c : module->cells()) {
if (use_selection && !module->selected(c))
continue;
f << stringf("%s\n", first ? "" : ",");
f << stringf(" %s: {\n", get_name(c->name).c_str());
f << stringf(" \"hide_name\": %s,\n", c->name[0] == '$' ? "1" : "0");
f << stringf(" \"type\": %s,\n", get_name(c->type).c_str());
if (aig_mode) {
Aig aig(c);
if (!aig.name.empty()) {
f << stringf(" \"model\": \"%s\",\n", aig.name.c_str());
aig_models.insert(aig);
}
}
f << stringf(" \"parameters\": {");
write_parameters(c->parameters);
f << stringf("\n },\n");
f << stringf(" \"attributes\": {");
write_parameters(c->attributes);
f << stringf("\n },\n");
if (c->known()) {
f << stringf(" \"port_directions\": {");
bool first2 = true;
for (auto &conn : c->connections()) {
string direction = "output";
if (c->input(conn.first))
direction = c->output(conn.first) ? "inout" : "input";
f << stringf("%s\n", first2 ? "" : ",");
f << stringf(" %s: \"%s\"", get_name(conn.first).c_str(), direction.c_str());
first2 = false;
}
f << stringf("\n },\n");
}
f << stringf(" \"connections\": {");
bool first2 = true;
for (auto &conn : c->connections()) {
f << stringf("%s\n", first2 ? "" : ",");
f << stringf(" %s: %s", get_name(conn.first).c_str(), get_bits(conn.second).c_str());
first2 = false;
}
f << stringf("\n }\n");
f << stringf(" }");
first = false;
}
f << stringf("\n },\n");
f << stringf(" \"netnames\": {");
first = true;
for (auto w : module->wires()) {
if (use_selection && !module->selected(w))
continue;
f << stringf("%s\n", first ? "" : ",");
f << stringf(" %s: {\n", get_name(w->name).c_str());
f << stringf(" \"hide_name\": %s,\n", w->name[0] == '$' ? "1" : "0");
f << stringf(" \"bits\": %s,\n", get_bits(w).c_str());
f << stringf(" \"attributes\": {");
write_parameters(w->attributes);
f << stringf("\n }\n");
f << stringf(" }");
first = false;
}
f << stringf("\n }\n");
f << stringf(" }");
}
void write_design(Design *design_)
{
design = design_;
f << stringf("{\n");
f << stringf(" \"creator\": %s,\n", get_string(yosys_version_str).c_str());
f << stringf(" \"modules\": {\n");
vector<Module*> modules = use_selection ? design->selected_modules() : design->modules();
bool first_module = true;
for (auto mod : modules) {
if (!first_module)
f << stringf(",\n");
write_module(mod);
first_module = false;
}
f << stringf("\n }");
if (!aig_models.empty()) {
f << stringf(",\n \"models\": {\n");
bool first_model = true;
for (auto &aig : aig_models) {
if (!first_model)
f << stringf(",\n");
f << stringf(" \"%s\": [\n", aig.name.c_str());
int node_idx = 0;
for (auto &node : aig.nodes) {
if (node_idx != 0)
f << stringf(",\n");
f << stringf(" /* %3d */ [ ", node_idx);
if (node.portbit >= 0)
f << stringf("\"%sport\", \"%s\", %d", node.inverter ? "n" : "",
log_id(node.portname), node.portbit);
else if (node.left_parent < 0 && node.right_parent < 0)
f << stringf("\"%s\"", node.inverter ? "true" : "false");
else
f << stringf("\"%s\", %d, %d", node.inverter ? "nand" : "and", node.left_parent, node.right_parent);
for (auto &op : node.outports)
f << stringf(", \"%s\", %d", log_id(op.first), op.second);
f << stringf(" ]");
node_idx++;
}
f << stringf("\n ]");
first_model = false;
}
f << stringf("\n }");
}
f << stringf("\n}\n");
}
};
struct JsonBackend : public Backend {
JsonBackend() : Backend("json", "write design to a JSON file") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" write_json [options] [filename]\n");
log("\n");
log("Write a JSON netlist of the current design.\n");
log("\n");
log(" -aig\n");
log(" include AIG models for the different gate types\n");
log("\n");
log("\n");
log("The general syntax of the JSON output created by this command is as follows:\n");
log("\n");
log(" {\n");
log(" \"modules\": {\n");
log(" <module_name>: {\n");
log(" \"ports\": {\n");
log(" <port_name>: <port_details>,\n");
log(" ...\n");
log(" },\n");
log(" \"cells\": {\n");
log(" <cell_name>: <cell_details>,\n");
log(" ...\n");
log(" },\n");
log(" \"netnames\": {\n");
log(" <net_name>: <net_details>,\n");
log(" ...\n");
log(" }\n");
log(" }\n");
log(" },\n");
log(" \"models\": {\n");
log(" ...\n");
log(" },\n");
log(" }\n");
log("\n");
log("Where <port_details> is:\n");
log("\n");
log(" {\n");
log(" \"direction\": <\"input\" | \"output\" | \"inout\">,\n");
log(" \"bits\": <bit_vector>\n");
log(" }\n");
log("\n");
log("And <cell_details> is:\n");
log("\n");
log(" {\n");
log(" \"hide_name\": <1 | 0>,\n");
log(" \"type\": <cell_type>,\n");
log(" \"parameters\": {\n");
log(" <parameter_name>: <parameter_value>,\n");
log(" ...\n");
log(" },\n");
log(" \"attributes\": {\n");
log(" <attribute_name>: <attribute_value>,\n");
log(" ...\n");
log(" },\n");
log(" \"port_directions\": {\n");
log(" <port_name>: <\"input\" | \"output\" | \"inout\">,\n");
log(" ...\n");
log(" },\n");
log(" \"connections\": {\n");
log(" <port_name>: <bit_vector>,\n");
log(" ...\n");
log(" },\n");
log(" }\n");
log("\n");
log("And <net_details> is:\n");
log("\n");
log(" {\n");
log(" \"hide_name\": <1 | 0>,\n");
log(" \"bits\": <bit_vector>\n");
log(" }\n");
log("\n");
log("The \"hide_name\" fields are set to 1 when the name of this cell or net is\n");
log("automatically created and is likely not of interest for a regular user.\n");
log("\n");
log("The \"port_directions\" section is only included for cells for which the\n");
log("interface is known.\n");
log("\n");
log("Module and cell ports and nets can be single bit wide or vectors of multiple\n");
log("bits. Each individual signal bit is assigned a unique integer. The <bit_vector>\n");
log("values referenced above are vectors of this integers. Signal bits that are\n");
log("connected to a constant driver are denoted as string \"0\" or \"1\" instead of\n");
log("a number.\n");
log("\n");
log("Numeric parameter and attribute values up to 32 bits are written as decimal\n");
log("values. Numbers larger than that are written as string holding the binary\n");
log("representation of the value.\n");
log("\n");
log("For example the following Verilog code:\n");
log("\n");
log(" module test(input x, y);\n");
log(" (* keep *) foo #(.P(42), .Q(1337))\n");
log(" foo_inst (.A({x, y}), .B({y, x}), .C({4'd10, {4{x}}}));\n");
log(" endmodule\n");
log("\n");
log("Translates to the following JSON output:\n");
log("\n");
log(" {\n");
log(" \"modules\": {\n");
log(" \"test\": {\n");
log(" \"ports\": {\n");
log(" \"x\": {\n");
log(" \"direction\": \"input\",\n");
log(" \"bits\": [ 2 ]\n");
log(" },\n");
log(" \"y\": {\n");
log(" \"direction\": \"input\",\n");
log(" \"bits\": [ 3 ]\n");
log(" }\n");
log(" },\n");
log(" \"cells\": {\n");
log(" \"foo_inst\": {\n");
log(" \"hide_name\": 0,\n");
log(" \"type\": \"foo\",\n");
log(" \"parameters\": {\n");
log(" \"Q\": 1337,\n");
log(" \"P\": 42\n");
log(" },\n");
log(" \"attributes\": {\n");
log(" \"keep\": 1,\n");
log(" \"src\": \"test.v:2\"\n");
log(" },\n");
log(" \"connections\": {\n");
log(" \"C\": [ 2, 2, 2, 2, \"0\", \"1\", \"0\", \"1\" ],\n");
log(" \"B\": [ 2, 3 ],\n");
log(" \"A\": [ 3, 2 ]\n");
log(" }\n");
log(" }\n");
log(" },\n");
log(" \"netnames\": {\n");
log(" \"y\": {\n");
log(" \"hide_name\": 0,\n");
log(" \"bits\": [ 3 ],\n");
log(" \"attributes\": {\n");
log(" \"src\": \"test.v:1\"\n");
log(" }\n");
log(" },\n");
log(" \"x\": {\n");
log(" \"hide_name\": 0,\n");
log(" \"bits\": [ 2 ],\n");
log(" \"attributes\": {\n");
log(" \"src\": \"test.v:1\"\n");
log(" }\n");
log(" }\n");
log(" }\n");
log(" }\n");
log(" }\n");
log(" }\n");
log("\n");
log("The models are given as And-Inverter-Graphs (AIGs) in the following form:\n");
log("\n");
log(" \"models\": {\n");
log(" <model_name>: [\n");
log(" /* 0 */ [ <node-spec> ],\n");
log(" /* 1 */ [ <node-spec> ],\n");
log(" /* 2 */ [ <node-spec> ],\n");
log(" ...\n");
log(" ],\n");
log(" ...\n");
log(" },\n");
log("\n");
log("The following node-types may be used:\n");
log("\n");
log(" [ \"port\", <portname>, <bitindex>, <out-list> ]\n");
log(" - the value of the specified input port bit\n");
log("\n");
log(" [ \"nport\", <portname>, <bitindex>, <out-list> ]\n");
log(" - the inverted value of the specified input port bit\n");
log("\n");
log(" [ \"and\", <node-index>, <node-index>, <out-list> ]\n");
log(" - the ANDed value of the specified nodes\n");
log("\n");
log(" [ \"nand\", <node-index>, <node-index>, <out-list> ]\n");
log(" - the inverted ANDed value of the specified nodes\n");
log("\n");
log(" [ \"true\", <out-list> ]\n");
log(" - the constant value 1\n");
log("\n");
log(" [ \"false\", <out-list> ]\n");
log(" - the constant value 0\n");
log("\n");
log("All nodes appear in topological order. I.e. only nodes with smaller indices\n");
log("are referenced by \"and\" and \"nand\" nodes.\n");
log("\n");
log("The optional <out-list> at the end of a node specification is a list of\n");
log("output portname and bitindex pairs, specifying the outputs driven by this node.\n");
log("\n");
log("For example, the following is the model for a 3-input 3-output $reduce_and cell\n");
log("inferred by the following code:\n");
log("\n");
log(" module test(input [2:0] in, output [2:0] out);\n");
log(" assign in = &out;\n");
log(" endmodule\n");
log("\n");
log(" \"$reduce_and:3U:3\": [\n");
log(" /* 0 */ [ \"port\", \"A\", 0 ],\n");
log(" /* 1 */ [ \"port\", \"A\", 1 ],\n");
log(" /* 2 */ [ \"and\", 0, 1 ],\n");
log(" /* 3 */ [ \"port\", \"A\", 2 ],\n");
log(" /* 4 */ [ \"and\", 2, 3, \"Y\", 0 ],\n");
log(" /* 5 */ [ \"false\", \"Y\", 1, \"Y\", 2 ]\n");
log(" ]\n");
log("\n");
log("Future version of Yosys might add support for additional fields in the JSON\n");
log("format. A program processing this format must ignore all unknown fields.\n");
log("\n");
}
virtual void execute(std::ostream *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design)
{
bool aig_mode = false;
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
if (args[argidx] == "-aig") {
aig_mode = true;
continue;
}
break;
}
extra_args(f, filename, args, argidx);
log_header(design, "Executing JSON backend.\n");
JsonWriter json_writer(*f, false, aig_mode);
json_writer.write_design(design);
}
} JsonBackend;
struct JsonPass : public Pass {
JsonPass() : Pass("json", "write design in JSON format") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" json [options] [selection]\n");
log("\n");
log("Write a JSON netlist of all selected objects.\n");
log("\n");
log(" -o <filename>\n");
log(" write to the specified file.\n");
log("\n");
log(" -aig\n");
log(" also include AIG models for the different gate types\n");
log("\n");
log("See 'help write_json' for a description of the JSON format used.\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
std::string filename;
bool aig_mode = false;
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
if (args[argidx] == "-o" && argidx+1 < args.size()) {
filename = args[++argidx];
continue;
}
if (args[argidx] == "-aig") {
aig_mode = true;
continue;
}
break;
}
extra_args(args, argidx, design);
std::ostream *f;
std::stringstream buf;
if (!filename.empty()) {
std::ofstream *ff = new std::ofstream;
ff->open(filename.c_str(), std::ofstream::trunc);
if (ff->fail()) {
delete ff;
log_error("Can't open file `%s' for writing: %s\n", filename.c_str(), strerror(errno));
}
f = ff;
} else {
f = &buf;
}
JsonWriter json_writer(*f, true, aig_mode);
json_writer.write_design(design);
if (!filename.empty()) {
delete f;
} else {
log("%s", buf.str().c_str());
}
}
} JsonPass;
PRIVATE_NAMESPACE_END
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