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read_vcd iverilog vcd 

Signed-off-by: James Cherry <cherry@parallaxsw.com>
This commit is contained in:
James Cherry 2022-10-25 15:00:41 -07:00
parent d12f9b9bbe
commit 28c6d82b8b
1 changed files with 69 additions and 56 deletions
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125
search/ReadVcd.cc
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@ -87,7 +87,7 @@ private:
class VcdVar
{
public:
enum VarType {wire, reg};
enum VarType {wire, reg, parameter};
VcdVar(string name,
VarType type,
int width,
@ -190,12 +190,19 @@ VcdReader::VcdReader(StaState *sta) :
void
VcdReader::parseTimescale()
{
string timescale = readStmtString();
size_t last;
time_scale_ = std::stod(timescale, &last);
if (last == token_.size())
report_->fileError(800, filename_, stmt_line_, "Missing timescale units.");
time_unit_ = timescale.substr(last + 1);
vector<string> tokens = readStmtTokens();
if (tokens.size() == 1) {
size_t last;
time_scale_ = std::stod(tokens[0], &last);
time_unit_ = tokens[0].substr(last);
}
else if (tokens.size() == 2) {
time_scale_ = std::stod(tokens[0]);
time_unit_ = tokens[1];
}
else
report_->fileError(800, filename_, stmt_line_, "timescale syntax error.");
if (time_unit_ == "fs")
time_unit_scale_ = 1e-15;
else if (time_unit_ == "ps")
@ -210,15 +217,16 @@ void
VcdReader::parseVar()
{
vector<string> tokens = readStmtTokens();
if (tokens.size() != 4)
report_->fileError(802, filename_, stmt_line_, "Variable syntax error.");
else {
if (tokens.size() == 4
|| tokens.size() == 5) {
string type_name = tokens[0];
VcdVar::VarType type = VcdVar::wire;
if (type_name == "wire")
type = VcdVar::wire;
else if (type_name == "reg")
type = VcdVar::reg;
else if (type_name == "parameter")
type = VcdVar::parameter;
else
report_->fileError(803, filename_, stmt_line_,
"Unknown variable type %s.",
@ -227,10 +235,15 @@ VcdReader::parseVar()
int width = stoi(tokens[1]);
string id = tokens[2];
string name = tokens[3];
// iverilog separates bus base name from bit range.
if (tokens.size() == 5)
name += tokens[4];
vars_.push_back(VcdVar(name, type, width, id));
max_var_name_length_ = std::max(max_var_name_length_, name.size());
max_var_width_ = std::max(max_var_width_, width);
}
else
report_->fileError(802, filename_, stmt_line_, "Variable syntax error.");
}
void
@ -286,7 +299,8 @@ VcdReader::parseVarValues()
string id = getToken();
auto var_itr = id_var_map_.find(id);
if (var_itr == id_var_map_.end())
("unknown variable %s\n", id.c_str());
report_->fileError(804, filename_, stmt_line_,
"unknown variable %s", id.c_str());
VcdVar *var = var_itr->second;
//printf("%s = %lld\n", var->name().c_str(), bus_value);
var->pushBusValue(time_, bus_value);
@ -303,8 +317,8 @@ VcdReader::appendVarValue(string id,
{
auto var_itr = id_var_map_.find(id);
if (var_itr == id_var_map_.end())
report_->fileError(800, filename_, stmt_line_, "Unknown var %s",
id.c_str());
report_->fileError(805, filename_, stmt_line_,
"Unknown variable %s", id.c_str());
VcdVar *var = var_itr->second;
var->pushValue(time_, value);
}
@ -323,13 +337,15 @@ VcdReader::varMinTimeDelta()
{
VarTime min_delta = std::numeric_limits<VarTime>::max();
for (VcdVar &var : vars_) {
VcdValues var_values = var.values();
VarTime prev_time = var_values[0].time();
for (VcdValue &value : var_values) {
VarTime time_delta = value.time() - prev_time;
if (time_delta > 0)
min_delta = min(min_delta, time_delta);
prev_time = value.time();
const VcdValues &var_values = var.values();
if (!var_values.empty()) {
VarTime prev_time = var_values[0].time();
for (const VcdValue &value : var_values) {
VarTime time_delta = value.time() - prev_time;
if (time_delta > 0)
min_delta = min(min_delta, time_delta);
prev_time = value.time();
}
}
}
return min_delta;
@ -396,55 +412,52 @@ VcdReader::reportWaveforms()
// Characters per time sample.
int zoom = (max_var_width_ + 7) / 4;
int time_delta = varMinTimeDelta();
// for (double time = 0.0; time < time_max_; time += time_delta) {
// //printf("%-*g", time_delta * zoom - 1, time * time_scale_ * time_unit_scale_);
// printf("%g", time * time_scale_ * time_unit_scale_);
// }
// printf("\n");
for (VcdVar &var : vars_) {
printf(" %-*s",
static_cast<int>(max_var_name_length_),
var.name().c_str());
VcdValues var_values = var.values();
size_t value_index = 0;
VcdValue var_value = var_values[value_index];
VcdValue prev_var_value = var_values[value_index];
VarTime next_value_time = var_values[value_index + 1].time();
for (double time = 0.0; time < time_max_; time += time_delta) {
if (time >= next_value_time) {
if (value_index < var_values.size() - 1)
value_index++;
var_value = var_values[value_index];
if (value_index < var_values.size())
next_value_time = var_values[value_index + 1].time();
}
if (var_value.value()) {
// 01UZX
char value = var_value.value();
char prev_value = prev_var_value.value();
if (var.width() == 1) {
if (value == '0' || value == '1') {
for (int z = 0; z < zoom; z++) {
if (z == 0
&& value != prev_value
&& (prev_value == '0'
|| prev_value == '1'))
printf("%s", prev_value == '1' ? "╲" : "╱");
else
printf("%s", value == '1' ? "▔" : "▁");
if (!var_values.empty()) {
size_t value_index = 0;
VcdValue var_value = var_values[value_index];
VcdValue prev_var_value = var_values[value_index];
VarTime next_value_time = var_values[value_index + 1].time();
for (double time = 0.0; time < time_max_; time += time_delta) {
if (time >= next_value_time) {
if (value_index < var_values.size() - 1)
value_index++;
var_value = var_values[value_index];
if (value_index < var_values.size())
next_value_time = var_values[value_index + 1].time();
}
if (var_value.value()) {
// 01UZX
char value = var_value.value();
char prev_value = prev_var_value.value();
if (var.width() == 1) {
if (value == '0' || value == '1') {
for (int z = 0; z < zoom; z++) {
if (z == 0
&& value != prev_value
&& (prev_value == '0'
|| prev_value == '1'))
printf("%s", prev_value == '1' ? "╲" : "╱");
else
printf("%s", value == '1' ? "▔" : "▁");
}
}
else
printf("%-*c", zoom, value);
}
else
printf("%-*c", zoom, value);
}
else
printf("%-*c", zoom, value);
// bus
printf("%-*llX", zoom, var_value.busValue());
prev_var_value = var_value;
}
else
// bus
printf("%-*llX", zoom, var_value.busValue());
prev_var_value = var_value;
}
printf("\n");
}