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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2022 Jannis Harder <jix@yosyshq.com> <me@jix.one>
*
* 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/yw.h"
#include "libs/json11/json11.hpp"
USING_YOSYS_NAMESPACE
// Use the same formatting as witness.py uses
static const char *pretty_name(IdString id)
{
const char *c_str = id.c_str();
const char *p = c_str;
if (*p != '\\')
return c_str;
p++;
if (*p == '[') {
p++;
while (*p >= '0' && *p <= '9')
p++;
if (p[0] != ']' || p[1] != 0)
return c_str;
return c_str + 1;
}
if (!(*p >= 'a' && *p <= 'z') && !(*p >= 'A' && *p <= 'Z') && *p != '_')
return c_str;
p++;
while ((*p >= '0' && *p <= '9') || (*p >= 'a' && *p <= 'z') || (*p >= 'A' && *p <= 'Z') || *p == '_')
p++;
if (*p != 0)
return c_str;
return c_str + 1;
}
std::string IdPath::str() const
{
std::string result;
for (auto &item : *this) {
const char *pretty = pretty_name(item);
if (pretty[0] == '[') {
result += pretty;
continue;
}
if (!result.empty())
result += '.';
result += pretty;
if (pretty[0] == '\\' || pretty[0] == '$')
result += ' ';
}
return result;
}
bool IdPath::get_address(int &addr) const
{
if (empty())
return false;
auto &last = back();
if (!last.begins_with("\\["))
return false;
if (last == "\\[0]") {
addr = 0;
return true;
}
char first = last.c_str()[2];
if (first < '1' || first > '9')
return false;
char *endptr;
addr = std::strtol(last.c_str() + 2, &endptr, 10);
return endptr[0] == ']' && endptr[1] == 0;
}
static std::vector<IdString> get_path(const json11::Json &json)
{
std::vector<IdString> result;
for (auto &path_item : json.array_items()) {
auto const &path_item_str = path_item.string_value();
if (path_item_str.empty())
return {};;
result.push_back(path_item_str);
}
return result;
}
ReadWitness::ReadWitness(const std::string &filename) :
filename(filename)
{
std::ifstream f(filename.c_str());
if (f.fail() || GetSize(filename) == 0)
log_error("Cannot open file `%s`\n", filename.c_str());
std::stringstream buf;
buf << f.rdbuf();
std::string err;
json11::Json json = json11::Json::parse(buf.str(), err);
if (!err.empty())
log_error("Failed to parse `%s`: %s\n", filename.c_str(), err.c_str());
std::string format = json["format"].string_value();
if (format.empty())
log_error("Failed to parse `%s`: Unknown format\n", filename.c_str());
if (format != "Yosys Witness Trace")
log_error("Failed to parse `%s`: Unsupported format `%s`\n", filename.c_str(), format.c_str());
for (auto &clock_json : json["clocks"].array_items()) {
Clock clock;
clock.path = get_path(clock_json["path"]);
if (clock.path.empty())
log_error("Failed to parse `%s`: Missing path for clock `%s`\n", filename.c_str(), clock_json.dump().c_str());
auto edge_str = clock_json["edge"];
if (edge_str.string_value() == "posedge")
clock.is_posedge = true;
else if (edge_str.string_value() == "negedge")
clock.is_negedge = true;
else
log_error("Failed to parse `%s`: Unknown edge type for clock `%s`\n", filename.c_str(), clock_json.dump().c_str());
if (!clock_json["offset"].is_number())
log_error("Failed to parse `%s`: Unknown offset for clock `%s`\n", filename.c_str(), clock_json.dump().c_str());
clock.offset = clock_json["offset"].int_value();
if (clock.offset < 0)
log_error("Failed to parse `%s`: Invalid offset for clock `%s`\n", filename.c_str(), clock_json.dump().c_str());
clocks.push_back(clock);
}
int bits_offset = 0;
for (auto &signal_json : json["signals"].array_items()) {
Signal signal;
signal.bits_offset = bits_offset;
signal.path = get_path(signal_json["path"]);
if (signal.path.empty())
log_error("Failed to parse `%s`: Missing path for signal `%s`\n", filename.c_str(), signal_json.dump().c_str());
if (!signal_json["width"].is_number())
log_error("Failed to parse `%s`: Unknown width for signal `%s`\n", filename.c_str(), signal_json.dump().c_str());
signal.width = signal_json["width"].int_value();
if (signal.width < 0)
log_error("Failed to parse `%s`: Invalid width for signal `%s`\n", filename.c_str(), signal_json.dump().c_str());
bits_offset += signal.width;
if (!signal_json["offset"].is_number())
log_error("Failed to parse `%s`: Unknown offset for signal `%s`\n", filename.c_str(), signal_json.dump().c_str());
signal.offset = signal_json["offset"].int_value();
if (signal.offset < 0)
log_error("Failed to parse `%s`: Invalid offset for signal `%s`\n", filename.c_str(), signal_json.dump().c_str());
signal.init_only = signal_json["init_only"].bool_value();
signals.push_back(signal);
}
for (auto &step_json : json["steps"].array_items()) {
Step step;
if (!step_json["bits"].is_string())
log_error("Failed to parse `%s`: Expected string as bits value for step %d\n", filename.c_str(), GetSize(steps));
step.bits = step_json["bits"].string_value();
for (char c : step.bits) {
if (c != '0' && c != '1' && c != 'x' && c != '?')
log_error("Failed to parse `%s`: Invalid bit '%c' value for step %d\n", filename.c_str(), c, GetSize(steps));
}
steps.push_back(step);
}
}
RTLIL::Const ReadWitness::get_bits(int t, int bits_offset, int width) const
{
log_assert(t >= 0 && t < GetSize(steps));
const std::string &bits = steps[t].bits;
RTLIL::Const result(State::Sa, width);
result.bits.reserve(width);
int read_begin = GetSize(bits) - 1 - bits_offset;
int read_end = max(-1, read_begin - width);
min(width, GetSize(bits) - bits_offset);
for (int i = read_begin, j = 0; i > read_end; i--, j++) {
RTLIL::State bit = State::Sa;
switch (bits[i]) {
case '0': bit = State::S0; break;
case '1': bit = State::S1; break;
case 'x': bit = State::Sx; break;
case '?': bit = State::Sa; break;
default:
log_abort();
}
result.bits[j] = bit;
}
return result;
}
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