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-rw-r--r--kernel/rtlil.cc33
-rw-r--r--kernel/rtlil.h4
-rw-r--r--passes/sat/Makefile.inc1
-rw-r--r--passes/sat/sim.cc810
4 files changed, 848 insertions, 0 deletions
diff --git a/kernel/rtlil.cc b/kernel/rtlil.cc
index 93cfef80e..4427303cc 100644
--- a/kernel/rtlil.cc
+++ b/kernel/rtlil.cc
@@ -161,6 +161,39 @@ std::string RTLIL::Const::decode_string() const
return string;
}
+bool RTLIL::Const::is_fully_zero() const
+{
+ cover("kernel.rtlil.const.is_fully_zero");
+
+ for (auto bit : bits)
+ if (bit != RTLIL::State::S0)
+ return false;
+
+ return true;
+}
+
+bool RTLIL::Const::is_fully_def() const
+{
+ cover("kernel.rtlil.const.is_fully_def");
+
+ for (auto bit : bits)
+ if (bit != RTLIL::State::S0 && bit != RTLIL::State::S1)
+ return false;
+
+ return true;
+}
+
+bool RTLIL::Const::is_fully_undef() const
+{
+ cover("kernel.rtlil.const.is_fully_undef");
+
+ for (auto bit : bits)
+ if (bit != RTLIL::State::Sx && bit != RTLIL::State::Sz)
+ return false;
+
+ return true;
+}
+
void RTLIL::AttrObject::set_bool_attribute(RTLIL::IdString id)
{
attributes[id] = RTLIL::Const(1);
diff --git a/kernel/rtlil.h b/kernel/rtlil.h
index 51a3fad6f..be558932f 100644
--- a/kernel/rtlil.h
+++ b/kernel/rtlil.h
@@ -479,6 +479,10 @@ struct RTLIL::Const
inline RTLIL::State &operator[](int index) { return bits.at(index); }
inline const RTLIL::State &operator[](int index) const { return bits.at(index); }
+ bool is_fully_zero() const;
+ bool is_fully_def() const;
+ bool is_fully_undef() const;
+
inline RTLIL::Const extract(int offset, int len = 1, RTLIL::State padding = RTLIL::State::S0) const {
RTLIL::Const ret;
ret.bits.reserve(len);
diff --git a/passes/sat/Makefile.inc b/passes/sat/Makefile.inc
index 6785b750a..4fcce2fad 100644
--- a/passes/sat/Makefile.inc
+++ b/passes/sat/Makefile.inc
@@ -2,6 +2,7 @@
OBJS += passes/sat/sat.o
OBJS += passes/sat/freduce.o
OBJS += passes/sat/eval.o
+OBJS += passes/sat/sim.o
OBJS += passes/sat/miter.o
OBJS += passes/sat/expose.o
OBJS += passes/sat/assertpmux.o
diff --git a/passes/sat/sim.cc b/passes/sat/sim.cc
new file mode 100644
index 000000000..a80d89a81
--- /dev/null
+++ b/passes/sat/sim.cc
@@ -0,0 +1,810 @@
+/*
+ * 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/yosys.h"
+#include "kernel/sigtools.h"
+#include "kernel/celltypes.h"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+struct SimShared
+{
+ bool debug = false;
+ bool hide_internal = true;
+ bool writeback = false;
+};
+
+struct SimInstance
+{
+ SimShared *shared;
+
+ Module *module;
+ Cell *instance;
+
+ SimInstance *parent;
+ dict<Cell*, SimInstance*> children;
+
+ SigMap sigmap;
+ dict<SigBit, State> state_nets;
+ dict<SigBit, pool<Cell*>> upd_cells;
+ dict<SigBit, pool<Wire*>> upd_outports;
+
+ pool<SigBit> dirty_bits;
+ pool<Cell*> dirty_cells;
+ pool<SimInstance*, hash_ptr_ops> dirty_children;
+
+ struct ff_state_t
+ {
+ State past_clock;
+ Const past_d;
+ };
+
+ struct mem_state_t
+ {
+ Const past_wr_clk;
+ Const past_wr_en;
+ Const past_wr_addr;
+ Const past_wr_data;
+ Const data;
+ };
+
+ dict<Cell*, ff_state_t> ff_database;
+ dict<Cell*, mem_state_t> mem_database;
+ pool<Cell*> formal_database;
+
+ dict<Wire*, pair<int, Const>> vcd_database;
+
+ SimInstance(SimShared *shared, Module *module, Cell *instance = nullptr, SimInstance *parent = nullptr) :
+ shared(shared), module(module), instance(instance), parent(parent), sigmap(module)
+ {
+ if (parent) {
+ log_assert(parent->children.count(instance) == 0);
+ parent->children[instance] = this;
+ }
+
+ for (auto wire : module->wires())
+ {
+ SigSpec sig = sigmap(wire);
+
+ for (int i = 0; i < GetSize(sig); i++) {
+ if (state_nets.count(sig[i]) == 0)
+ state_nets[sig[i]] = State::Sx;
+ if (wire->port_output) {
+ upd_outports[sig[i]].insert(wire);
+ dirty_bits.insert(sig[i]);
+ }
+ }
+
+ if (wire->attributes.count("\\init")) {
+ Const initval = wire->attributes.at("\\init");
+ for (int i = 0; i < GetSize(sig) && i < GetSize(initval); i++)
+ if (initval[i] == State::S0 || initval[i] == State::S1) {
+ state_nets[sig[i]] = initval[i];
+ dirty_bits.insert(sig[i]);
+ }
+ }
+ }
+
+ for (auto cell : module->cells())
+ {
+ Module *mod = module->design->module(cell->type);
+
+ if (mod != nullptr) {
+ dirty_children.insert(new SimInstance(shared, mod, cell, this));
+ }
+
+ for (auto &port : cell->connections()) {
+ if (cell->input(port.first))
+ for (auto bit : sigmap(port.second))
+ upd_cells[bit].insert(cell);
+ }
+
+ if (cell->type.in("$dff")) {
+ ff_state_t ff;
+ ff.past_clock = State::Sx;
+ ff.past_d = Const(State::Sx, cell->getParam("\\WIDTH").as_int());
+ ff_database[cell] = ff;
+ }
+
+ if (cell->type == "$mem")
+ {
+ mem_state_t mem;
+
+ mem.past_wr_clk = Const(State::Sx, GetSize(cell->getPort("\\WR_CLK")));
+ mem.past_wr_en = Const(State::Sx, GetSize(cell->getPort("\\WR_EN")));
+ mem.past_wr_addr = Const(State::Sx, GetSize(cell->getPort("\\WR_ADDR")));
+ mem.past_wr_data = Const(State::Sx, GetSize(cell->getPort("\\WR_DATA")));
+
+ mem.data = cell->getParam("\\INIT");
+ int sz = cell->getParam("\\SIZE").as_int() * cell->getParam("\\WIDTH").as_int();
+
+ if (GetSize(mem.data) > sz)
+ mem.data.bits.resize(sz);
+
+ while (GetSize(mem.data) < sz)
+ mem.data.bits.push_back(State::Sx);
+
+ mem_database[cell] = mem;
+ }
+
+ if (cell->type.in("$assert", "$cover", "$assume")) {
+ formal_database.insert(cell);
+ }
+ }
+ }
+
+ ~SimInstance()
+ {
+ for (auto child : children)
+ delete child.second;
+ }
+
+ IdString name() const
+ {
+ if (instance != nullptr)
+ return instance->name;
+ return module->name;
+ }
+
+ std::string hiername() const
+ {
+ if (instance != nullptr)
+ return parent->hiername() + "." + log_id(instance->name);
+
+ return log_id(module->name);
+ }
+
+ Const get_state(SigSpec sig)
+ {
+ Const value;
+
+ for (auto bit : sigmap(sig))
+ if (bit.wire == nullptr)
+ value.bits.push_back(bit.data);
+ else if (state_nets.count(bit))
+ value.bits.push_back(state_nets.at(bit));
+ else
+ value.bits.push_back(State::Sz);
+
+ if (shared->debug)
+ log("[%s] get %s: %s\n", hiername().c_str(), log_signal(sig), log_signal(value));
+ return value;
+ }
+
+ bool set_state(SigSpec sig, Const value)
+ {
+ bool did_something = false;
+
+ sig = sigmap(sig);
+ log_assert(GetSize(sig) == GetSize(value));
+
+ for (int i = 0; i < GetSize(sig); i++)
+ if (state_nets.at(sig[i]) != value[i]) {
+ state_nets.at(sig[i]) = value[i];
+ dirty_bits.insert(sig[i]);
+ did_something = true;
+ }
+
+ if (shared->debug)
+ log("[%s] set %s: %s\n", hiername().c_str(), log_signal(sig), log_signal(value));
+ return did_something;
+ }
+
+ void update_cell(Cell *cell)
+ {
+ if (ff_database.count(cell))
+ return;
+
+ if (formal_database.count(cell))
+ return;
+
+ if (mem_database.count(cell))
+ {
+ mem_state_t &mem = mem_database.at(cell);
+
+ int num_rd_ports = cell->getParam("\\RD_PORTS").as_int();
+
+ int size = cell->getParam("\\SIZE").as_int();
+ int offset = cell->getParam("\\OFFSET").as_int();
+ int abits = cell->getParam("\\ABITS").as_int();
+ int width = cell->getParam("\\WIDTH").as_int();
+
+ if (cell->getParam("\\RD_CLK_ENABLE").as_bool())
+ log_error("Memory %s.%s has clocked read ports. Run 'memory' with -nordff.\n", log_id(module), log_id(cell));
+
+ SigSpec rd_addr_sig = cell->getPort("\\RD_ADDR");
+ SigSpec rd_data_sig = cell->getPort("\\RD_DATA");
+
+ for (int port_idx = 0; port_idx < num_rd_ports; port_idx++)
+ {
+ Const addr = get_state(rd_addr_sig.extract(port_idx*abits, abits));
+ Const data = Const(State::Sx, width);
+
+ if (addr.is_fully_def()) {
+ int index = addr.as_int() - offset;
+ if (index >= 0 && index < size)
+ data = mem.data.extract(index*width, width);
+ }
+
+ set_state(rd_data_sig.extract(port_idx*width, width), data);
+ }
+
+ return;
+ }
+
+ if (children.count(cell))
+ {
+ auto child = children.at(cell);
+ for (auto &conn: cell->connections())
+ if (cell->input(conn.first)) {
+ Const value = get_state(conn.second);
+ child->set_state(child->module->wire(conn.first), value);
+ }
+ dirty_children.insert(child);
+ return;
+ }
+
+ if (yosys_celltypes.cell_evaluable(cell->type))
+ {
+ RTLIL::SigSpec sig_a, sig_b, sig_c, sig_d, sig_s, sig_y;
+ bool has_a, has_b, has_c, has_d, has_s, has_y;
+
+ has_a = cell->hasPort("\\A");
+ has_b = cell->hasPort("\\B");
+ has_c = cell->hasPort("\\C");
+ has_d = cell->hasPort("\\D");
+ has_s = cell->hasPort("\\S");
+ has_y = cell->hasPort("\\Y");
+
+ if (has_a) sig_a = cell->getPort("\\A");
+ if (has_b) sig_b = cell->getPort("\\B");
+ if (has_c) sig_c = cell->getPort("\\C");
+ if (has_d) sig_d = cell->getPort("\\D");
+ if (has_s) sig_s = cell->getPort("\\S");
+ if (has_y) sig_y = cell->getPort("\\Y");
+
+ if (shared->debug)
+ log("[%s] eval %s (%s)\n", hiername().c_str(), log_id(cell), log_id(cell->type));
+
+ // Simple (A -> Y) and (A,B -> Y) cells
+ if (has_a && !has_c && !has_d && !has_s && has_y) {
+ set_state(sig_y, CellTypes::eval(cell, get_state(sig_a), get_state(sig_b)));
+ return;
+ }
+
+ // (A,B,C -> Y) cells
+ if (has_a && has_b && has_c && !has_d && !has_s && has_y) {
+ set_state(sig_y, CellTypes::eval(cell, get_state(sig_a), get_state(sig_b), get_state(sig_c)));
+ return;
+ }
+
+ // (A,B,S -> Y) cells
+ if (has_a && has_b && !has_c && !has_d && has_s && has_y) {
+ set_state(sig_y, CellTypes::eval(cell, get_state(sig_a), get_state(sig_b), get_state(sig_s)));
+ return;
+ }
+
+ log_warning("Unsupported evaluable cell type: %s (%s.%s)\n", log_id(cell->type), log_id(module), log_id(cell));
+ return;
+ }
+
+ log_error("Unsupported cell type: %s (%s.%s)\n", log_id(cell->type), log_id(module), log_id(cell));
+ }
+
+ void update_ph1()
+ {
+ pool<Cell*> queue_cells;
+ pool<Wire*> queue_outports;
+
+ queue_cells.swap(dirty_cells);
+
+ while (1)
+ {
+ for (auto bit : dirty_bits)
+ {
+ if (upd_cells.count(bit))
+ for (auto cell : upd_cells.at(bit))
+ queue_cells.insert(cell);
+
+ if (upd_outports.count(bit) && parent != nullptr)
+ for (auto wire : upd_outports.at(bit))
+ queue_outports.insert(wire);
+ }
+
+ dirty_bits.clear();
+
+ if (!queue_cells.empty())
+ {
+ for (auto cell : queue_cells)
+ update_cell(cell);
+
+ queue_cells.clear();
+ continue;
+ }
+
+ for (auto wire : queue_outports)
+ if (instance->hasPort(wire->name)) {
+ Const value = get_state(wire);
+ parent->set_state(instance->getPort(wire->name), value);
+ }
+
+ queue_outports.clear();
+
+ for (auto child : dirty_children)
+ child->update_ph1();
+
+ dirty_children.clear();
+
+ if (dirty_bits.empty())
+ break;
+ }
+ }
+
+ bool update_ph2()
+ {
+ bool did_something = false;
+
+ for (auto &it : ff_database)
+ {
+ Cell *cell = it.first;
+ ff_state_t &ff = it.second;
+
+ if (cell->type.in("$dff"))
+ {
+ bool clkpol = cell->getParam("\\CLK_POLARITY").as_bool();
+ State current_clock = get_state(cell->getPort("\\CLK"))[0];
+
+ if (clkpol ? (ff.past_clock == State::S1 || current_clock != State::S1) :
+ (ff.past_clock == State::S0 || current_clock != State::S0))
+ continue;
+
+ if (set_state(cell->getPort("\\Q"), ff.past_d))
+ did_something = true;
+ }
+ }
+
+ for (auto &it : mem_database)
+ {
+ Cell *cell = it.first;
+ mem_state_t &mem = it.second;
+
+ int num_wr_ports = cell->getParam("\\WR_PORTS").as_int();
+
+ int size = cell->getParam("\\SIZE").as_int();
+ int offset = cell->getParam("\\OFFSET").as_int();
+ int abits = cell->getParam("\\ABITS").as_int();
+ int width = cell->getParam("\\WIDTH").as_int();
+
+ Const wr_clk_enable = cell->getParam("\\WR_CLK_ENABLE");
+ Const wr_clk_polarity = cell->getParam("\\WR_CLK_POLARITY");
+ Const current_wr_clk = get_state(cell->getPort("\\WR_CLK"));
+
+ for (int port_idx = 0; port_idx < num_wr_ports; port_idx++)
+ {
+ Const addr, data, enable;
+
+ if (wr_clk_enable[port_idx] == State::S0)
+ {
+ addr = get_state(cell->getPort("\\WR_ADDR").extract(port_idx*abits, abits));
+ data = get_state(cell->getPort("\\WR_DATA").extract(port_idx*width, width));
+ enable = get_state(cell->getPort("\\WR_EN").extract(port_idx*width, width));
+ }
+ else
+ {
+ if (wr_clk_polarity[port_idx] == State::S1 ?
+ (mem.past_wr_clk[port_idx] == State::S1 || current_wr_clk[port_idx] != State::S1) :
+ (mem.past_wr_clk[port_idx] == State::S0 || current_wr_clk[port_idx] != State::S0))
+ continue;
+
+ addr = mem.past_wr_addr.extract(port_idx*abits, abits);
+ data = mem.past_wr_data.extract(port_idx*width, width);
+ enable = mem.past_wr_en.extract(port_idx*width, width);
+ }
+
+ if (addr.is_fully_def())
+ {
+ int index = addr.as_int() - offset;
+ if (index >= 0 && index < size)
+ for (int i = 0; i < width; i++)
+ if (enable[i] == State::S1 && mem.data.bits.at(index*width+i) != data[i]) {
+ mem.data.bits.at(index*width+i) = data[i];
+ dirty_cells.insert(cell);
+ did_something = true;
+ }
+ }
+ }
+ }
+
+ for (auto it : children)
+ if (it.second->update_ph2()) {
+ dirty_children.insert(it.second);
+ did_something = true;
+ }
+
+ return did_something;
+ }
+
+ void update_ph3()
+ {
+ for (auto &it : ff_database)
+ {
+ Cell *cell = it.first;
+ ff_state_t &ff = it.second;
+
+ if (cell->type.in("$dff")) {
+ ff.past_clock = get_state(cell->getPort("\\CLK"))[0];
+ ff.past_d = get_state(cell->getPort("\\D"));
+ }
+ }
+
+ for (auto &it : mem_database)
+ {
+ Cell *cell = it.first;
+ mem_state_t &mem = it.second;
+
+ mem.past_wr_clk = get_state(cell->getPort("\\WR_CLK"));
+ mem.past_wr_en = get_state(cell->getPort("\\WR_EN"));
+ mem.past_wr_addr = get_state(cell->getPort("\\WR_ADDR"));
+ mem.past_wr_data = get_state(cell->getPort("\\WR_DATA"));
+ }
+
+ for (auto cell : formal_database)
+ {
+ string label = log_id(cell);
+ if (cell->attributes.count("\\src"))
+ label = cell->attributes.at("\\src").decode_string();
+
+ State a = get_state(cell->getPort("\\A"))[0];
+ State en = get_state(cell->getPort("\\EN"))[0];
+
+ if (cell->type == "$cover" && en == State::S1 && a != State::S1)
+ log("Cover %s.%s (%s) reached.\n", hiername().c_str(), log_id(cell), label.c_str());
+
+ if (cell->type == "$assume" && en == State::S1 && a != State::S1)
+ log("Assumption %s.%s (%s) failed.\n", hiername().c_str(), log_id(cell), label.c_str());
+
+ if (cell->type == "$assert" && en == State::S1 && a != State::S1)
+ log_warning("Assert %s.%s (%s) failed.\n", hiername().c_str(), log_id(cell), label.c_str());
+ }
+
+ for (auto it : children)
+ it.second->update_ph3();
+ }
+
+ void writeback(pool<Module*> &wbmods)
+ {
+ if (wbmods.count(module))
+ log_error("Instance %s of module %s is not unique: Writeback not possible. (Fix by running 'singleton'.)\n", hiername().c_str(), log_id(module));
+
+ wbmods.insert(module);
+
+ for (auto wire : module->wires())
+ wire->attributes.erase("\\init");
+
+ for (auto &it : ff_database)
+ {
+ Cell *cell = it.first;
+ SigSpec sig_q = cell->getPort("\\Q");
+ Const initval = get_state(sig_q);
+
+ for (int i = 0; i < GetSize(sig_q); i++)
+ {
+ Wire *w = sig_q[i].wire;
+
+ if (w->attributes.count("\\init") == 0)
+ w->attributes["\\init"] = Const(State::Sx, GetSize(w));
+
+ w->attributes["\\init"][sig_q[i].offset] = initval[i];
+ }
+ }
+
+ for (auto &it : mem_database)
+ {
+ Cell *cell = it.first;
+ mem_state_t &mem = it.second;
+ Const initval = mem.data;
+
+ while (GetSize(initval) >= 2) {
+ if (initval[GetSize(initval)-1] != State::Sx) break;
+ if (initval[GetSize(initval)-2] != State::Sx) break;
+ initval.bits.pop_back();
+ }
+
+ cell->setParam("\\INIT", initval);
+ }
+
+ for (auto it : children)
+ it.second->writeback(wbmods);
+ }
+
+ void write_vcd_header(std::ofstream &f, int &id)
+ {
+ f << stringf("$scope module %s $end\n", log_id(name()));
+
+ for (auto wire : module->wires())
+ {
+ if (shared->hide_internal && wire->name[0] == '$')
+ continue;
+
+ f << stringf("$var wire %d n%d %s%s $end\n", GetSize(wire), id, wire->name[0] == '$' ? "\\" : "", log_id(wire));
+ vcd_database[wire] = make_pair(id++, Const());
+ }
+
+ for (auto child : children)
+ child.second->write_vcd_header(f, id);
+
+ f << stringf("$upscope $end\n");
+ }
+
+ void write_vcd_step(std::ofstream &f)
+ {
+ for (auto &it : vcd_database)
+ {
+ Wire *wire = it.first;
+ Const value = get_state(wire);
+ int id = it.second.first;
+
+ if (it.second.second == value)
+ continue;
+
+ it.second.second = value;
+
+ f << "b";
+ for (int i = GetSize(value)-1; i >= 0; i--) {
+ switch (value[i]) {
+ case State::S0: f << "0"; break;
+ case State::S1: f << "1"; break;
+ case State::Sx: f << "x"; break;
+ default: f << "z";
+ }
+ }
+
+ f << stringf(" n%d\n", id);
+ }
+
+ for (auto child : children)
+ child.second->write_vcd_step(f);
+ }
+};
+
+struct SimWorker : SimShared
+{
+ SimInstance *top = nullptr;
+ std::ofstream vcdfile;
+ pool<IdString> clock, clockn, reset, resetn;
+
+ ~SimWorker()
+ {
+ delete top;
+ }
+
+ void write_vcd_header()
+ {
+ if (!vcdfile.is_open())
+ return;
+
+ int id = 1;
+ top->write_vcd_header(vcdfile, id);
+
+ vcdfile << stringf("$enddefinitions $end\n");
+ }
+
+ void write_vcd_step(int t)
+ {
+ if (!vcdfile.is_open())
+ return;
+
+ vcdfile << stringf("#%d\n", t);
+ top->write_vcd_step(vcdfile);
+ }
+
+ void update()
+ {
+ while (1)
+ {
+ if (debug)
+ log("\n-- ph1 --\n");
+
+ top->update_ph1();
+
+ if (debug)
+ log("\n-- ph2 --\n");
+
+ if (!top->update_ph2())
+ break;
+ }
+
+ if (debug)
+ log("\n-- ph3 --\n");
+
+ top->update_ph3();
+ }
+
+ void set_inports(pool<IdString> ports, State value)
+ {
+ for (auto portname : ports)
+ {
+ Wire *w = top->module->wire(portname);
+
+ if (w == nullptr)
+ log_error("Can't find port %s on module %s.\n", log_id(portname), log_id(top->module));
+
+ top->set_state(w, value);
+ }
+ }
+
+ void run(Module *topmod, int numcycles)
+ {
+ log_assert(top == nullptr);
+ top = new SimInstance(this, topmod);
+
+ if (debug)
+ log("\n===== 0 =====\n");
+ else
+ log("Simulating cycle 0.\n");
+
+ set_inports(reset, State::S1);
+ set_inports(resetn, State::S0);
+
+ update();
+
+ write_vcd_header();
+ write_vcd_step(0);
+
+ for (int cycle = 0; cycle < numcycles; cycle++)
+ {
+ if (debug)
+ log("\n===== %d =====\n", 10*cycle + 5);
+
+ set_inports(clock, State::S0);
+ set_inports(clockn, State::S1);
+
+ update();
+ write_vcd_step(10*cycle + 5);
+
+ if (debug)
+ log("\n===== %d =====\n", 10*cycle + 10);
+ else
+ log("Simulating cycle %d.\n", cycle+1);
+
+ set_inports(clock, State::S1);
+ set_inports(clockn, State::S0);
+
+ if (cycle == 0) {
+ set_inports(reset, State::S0);
+ set_inports(resetn, State::S1);
+ }
+
+ update();
+ write_vcd_step(10*cycle + 10);
+ }
+
+ write_vcd_step(10*numcycles + 2);
+
+ if (writeback) {
+ pool<Module*> wbmods;
+ top->writeback(wbmods);
+ }
+ }
+};
+
+struct SimPass : public Pass {
+ SimPass() : Pass("sim", "simulate the circuit") { }
+ virtual void help()
+ {
+ // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+ log("\n");
+ log(" sim [options] [top-level]\n");
+ log("\n");
+ log("This command simulates the circuit using the given top-level module.\n");
+ log("\n");
+ log(" -vcd <filename>\n");
+ log(" write the simulation results to the given VCD file\n");
+ log("\n");
+ log(" -clock <portname>\n");
+ log(" name of top-level clock input\n");
+ log("\n");
+ log(" -clockn <portname>\n");
+ log(" name of top-level clock input (inverse polarity)\n");
+ log("\n");
+ log(" -reset <portname>\n");
+ log(" name of top-level reset input (active high)\n");
+ log("\n");
+ log(" -resetn <portname>\n");
+ log(" name of top-level inverted reset input (active low)\n");
+ log("\n");
+ log(" -n <integer>\n");
+ log(" number of cycles to simulate (default: 20)\n");
+ log("\n");
+ log(" -a\n");
+ log(" include all nets in VCD output, nut just those with public names\n");
+ log("\n");
+ log(" -w\n");
+ log(" writeback mode: use final simulation state as new init state\n");
+ log("\n");
+ log(" -d\n");
+ log(" enable debug output\n");
+ log("\n");
+ }
+ virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
+ {
+ SimWorker worker;
+ int numcycles = 20;
+
+ log_header(design, "Executing SIM pass (simulate the circuit).\n");
+
+ size_t argidx;
+ for (argidx = 1; argidx < args.size(); argidx++) {
+ if (args[argidx] == "-vcd" && argidx+1 < args.size()) {
+ worker.vcdfile.open(args[++argidx].c_str());
+ continue;
+ }
+ if (args[argidx] == "-n" && argidx+1 < args.size()) {
+ numcycles = atoi(args[++argidx].c_str());
+ continue;
+ }
+ if (args[argidx] == "-clock" && argidx+1 < args.size()) {
+ worker.clock.insert(RTLIL::escape_id(args[++argidx]));
+ continue;
+ }
+ if (args[argidx] == "-clockn" && argidx+1 < args.size()) {
+ worker.clockn.insert(RTLIL::escape_id(args[++argidx]));
+ continue;
+ }
+ if (args[argidx] == "-reset" && argidx+1 < args.size()) {
+ worker.reset.insert(RTLIL::escape_id(args[++argidx]));
+ continue;
+ }
+ if (args[argidx] == "-resetn" && argidx+1 < args.size()) {
+ worker.resetn.insert(RTLIL::escape_id(args[++argidx]));
+ continue;
+ }
+ if (args[argidx] == "-a") {
+ worker.hide_internal = false;
+ continue;
+ }
+ if (args[argidx] == "-d") {
+ worker.debug = true;
+ continue;
+ }
+ if (args[argidx] == "-w") {
+ worker.writeback = true;
+ continue;
+ }
+ break;
+ }
+ extra_args(args, argidx, design);
+
+ Module *top_mod = nullptr;
+
+ if (design->full_selection()) {
+ top_mod = design->top_module();
+ } else {
+ auto mods = design->selected_whole_modules();
+ if (GetSize(mods) != 1)
+ log_cmd_error("Only one top module must be selected.\n");
+ top_mod = mods.front();
+ }
+
+ worker.run(top_mod, numcycles);
+ }
+} SimPass;
+
+PRIVATE_NAMESPACE_END
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 08:11:33 +0000