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-rw-r--r--backends/blif/Makefile.inc3
-rw-r--r--backends/blif/blif.cc242
2 files changed, 245 insertions, 0 deletions
diff --git a/backends/blif/Makefile.inc b/backends/blif/Makefile.inc
new file mode 100644
index 000000000..517dabaf2
--- /dev/null
+++ b/backends/blif/Makefile.inc
@@ -0,0 +1,3 @@
+
+OBJS += backends/blif/blif.o
+
diff --git a/backends/blif/blif.cc b/backends/blif/blif.cc
new file mode 100644
index 000000000..fb1e3b7bc
--- /dev/null
+++ b/backends/blif/blif.cc
@@ -0,0 +1,242 @@
+/*
+ * 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.
+ *
+ */
+
+// [[CITE]] Berkeley Logic Interchange Format (BLIF)
+// University of California. Berkeley. July 28, 1992
+// http://www.ece.cmu.edu/~ee760/760docs/blif.pdf
+
+#include "kernel/rtlil.h"
+#include "kernel/register.h"
+#include "kernel/sigtools.h"
+#include "kernel/celltypes.h"
+#include "kernel/log.h"
+#include <string>
+#include <assert.h>
+
+struct BlifDumper
+{
+ FILE *f;
+ RTLIL::Module *module;
+ RTLIL::Design *design;
+ CellTypes ct;
+
+ BlifDumper(FILE *f, RTLIL::Module *module, RTLIL::Design *design) : f(f), module(module), design(design), ct(design)
+ {
+ }
+
+ std::vector<std::string> cstr_buf;
+
+ const char *cstr(RTLIL::IdString id)
+ {
+ std::string str = RTLIL::unescape_id(id);
+ for (size_t i = 0; i < str.size(); i++)
+ if (str[i] == '#' || str[i] == '=')
+ str[i] = '?';
+ cstr_buf.push_back(str);
+ return cstr_buf.back().c_str();
+ }
+
+ const char *cstr(RTLIL::SigSpec sig)
+ {
+ sig.optimize();
+ log_assert(sig.width == 1);
+
+ if (sig.chunks.at(0).wire == NULL)
+ return sig.chunks.at(0).data.bits.at(0) == RTLIL::State::S1 ? "$true" : "$false";
+
+ std::string str = RTLIL::unescape_id(sig.chunks.at(0).wire->name);
+ for (size_t i = 0; i < str.size(); i++)
+ if (str[i] == '#' || str[i] == '=')
+ str[i] = '?';
+
+ if (sig.chunks.at(0).wire->width != 1)
+ str += stringf("[%d]", sig.chunks.at(0).offset);
+
+ cstr_buf.push_back(str);
+ return cstr_buf.back().c_str();
+ }
+
+ void dump()
+ {
+ fprintf(f, "\n");
+ fprintf(f, ".model %s\n", cstr(module->name));
+
+ std::map<int, RTLIL::Wire*> inputs, outputs;
+
+ for (auto &wire_it : module->wires) {
+ RTLIL::Wire *wire = wire_it.second;
+ if (wire->port_input)
+ inputs[wire->port_id] = wire;
+ if (wire->port_output)
+ outputs[wire->port_id] = wire;
+ }
+
+ fprintf(f, ".inputs");
+ for (auto &it : inputs) {
+ RTLIL::Wire *wire = it.second;
+ for (int i = 0; i < wire->width; i++)
+ fprintf(f, " %s", cstr(RTLIL::SigSpec(wire, 1, i)));
+ }
+ fprintf(f, "\n");
+
+ fprintf(f, ".outputs");
+ for (auto &it : outputs) {
+ RTLIL::Wire *wire = it.second;
+ for (int i = 0; i < wire->width; i++)
+ fprintf(f, " %s", cstr(RTLIL::SigSpec(wire, 1, i)));
+ }
+ fprintf(f, "\n");
+
+ fprintf(f, ".names $false\n");
+ fprintf(f, ".names $true\n1\n");
+
+ for (auto &cell_it : module->cells)
+ {
+ RTLIL::Cell *cell = cell_it.second;
+
+ if (cell->type == "$_INV_") {
+ fprintf(f, ".names %s %s\n0 1\n",
+ cstr(cell->connections.at("\\A")), cstr(cell->connections.at("\\Y")));
+ continue;
+ }
+
+ if (cell->type == "$_AND_") {
+ fprintf(f, ".names %s %s %s\n11 1\n",
+ cstr(cell->connections.at("\\A")), cstr(cell->connections.at("\\B")), cstr(cell->connections.at("\\Y")));
+ continue;
+ }
+
+ if (cell->type == "$_OR_") {
+ fprintf(f, ".names %s %s %s\n1- 1\n-1 1\n",
+ cstr(cell->connections.at("\\A")), cstr(cell->connections.at("\\B")), cstr(cell->connections.at("\\Y")));
+ continue;
+ }
+
+ if (cell->type == "$_XOR_") {
+ fprintf(f, ".names %s %s %s\n10 1\n01 1\n",
+ cstr(cell->connections.at("\\A")), cstr(cell->connections.at("\\B")), cstr(cell->connections.at("\\Y")));
+ continue;
+ }
+
+ if (cell->type == "$_MUX_") {
+ fprintf(f, ".names %s %s %s %s\n1-0 1\n-11 1\n",
+ cstr(cell->connections.at("\\A")), cstr(cell->connections.at("\\B")),
+ cstr(cell->connections.at("\\S")), cstr(cell->connections.at("\\Y")));
+ continue;
+ }
+
+ if (cell->type == "$_DFF_N_") {
+ fprintf(f, ".latch %s %s fe %s\n",
+ cstr(cell->connections.at("\\D")), cstr(cell->connections.at("\\Q")), cstr(cell->connections.at("\\C")));
+ continue;
+ }
+
+ if (cell->type == "$_DFF_P_") {
+ fprintf(f, ".latch %s %s re %s\n",
+ cstr(cell->connections.at("\\D")), cstr(cell->connections.at("\\Q")), cstr(cell->connections.at("\\C")));
+ continue;
+ }
+
+ fprintf(f, ".subckt %s", cstr(cell->type));
+ for (auto &conn : cell->connections)
+ for (int i = 0; i < conn.second.width; i++) {
+ if (conn.second.width == 1)
+ fprintf(f, " %s", cstr(conn.first));
+ else
+ fprintf(f, " %s[%d]", cstr(conn.first), i);
+ fprintf(f, "=%s", cstr(conn.second.extract(i, 1)));
+ }
+ fprintf(f, "\n");
+ }
+
+ for (auto &conn : module->connections)
+ for (int i = 0; i < conn.first.width; i++)
+ fprintf(f, ".names %s %s\n1 1\n", cstr(conn.second.extract(i, 1)), cstr(conn.first.extract(i, 1)));
+
+ fprintf(f, ".end\n");
+ }
+
+ static void dump(FILE *f, RTLIL::Module *module, RTLIL::Design *design)
+ {
+ BlifDumper dumper(f, module, design);
+ dumper.dump();
+ }
+};
+
+struct BlifBackend : public Backend {
+ BlifBackend() : Backend("blif", "write design to BLIF file") { }
+ virtual void help()
+ {
+ // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+ log("\n");
+ log(" write_blif [options] [filename]\n");
+ log("\n");
+ log("Write the current design to an BLIF file.\n");
+ log("\n");
+ log(" -top top_module\n");
+ log(" set the specified module as design top module\n");
+ log("\n");
+ }
+ virtual void execute(FILE *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design)
+ {
+ std::string top_module_name;
+
+ log_header("Executing BLIF backend.\n");
+
+ size_t argidx;
+ for (argidx = 1; argidx < args.size(); argidx++)
+ {
+ if (args[argidx] == "-top" && argidx+1 < args.size()) {
+ top_module_name = args[++argidx];
+ continue;
+ }
+ break;
+ }
+ extra_args(f, filename, args, argidx);
+
+ std::vector<RTLIL::Module*> mod_list;
+
+ for (auto module_it : design->modules)
+ {
+ RTLIL::Module *module = module_it.second;
+ if ((module->attributes.count("\\placeholder") > 0) > 0)
+ continue;
+
+ if (module->processes.size() != 0)
+ log_error("Found unmapped processes in module %s: unmapped processes are not supported in BLIF backend!\n", RTLIL::id2cstr(module->name));
+ if (module->memories.size() != 0)
+ log_error("Found munmapped emories in module %s: unmapped memories are not supported in BLIF backend!\n", RTLIL::id2cstr(module->name));
+
+ if (module->name == RTLIL::escape_id(top_module_name)) {
+ BlifDumper::dump(f, module, design);
+ top_module_name.clear();
+ continue;
+ }
+
+ mod_list.push_back(module);
+ }
+
+ if (!top_module_name.empty())
+ log_error("Can't find top module `%s'!\n", top_module_name.c_str());
+
+ for (auto module : mod_list)
+ BlifDumper::dump(f, module, design);
+ }
+} BlifBackend;
+
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