From b380af9d6d49ad4a7a944eb02abd3fa222f383a3 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Wed, 6 Mar 2013 11:58:07 +0100
Subject: Added support for loadable modules (aka plugins)

---
 .gitignore       |  2 ++
 Makefile         | 13 +++++++++----
 kernel/driver.cc | 31 +++++++++++++++++++++++--------
 yosys-config.in  | 30 ++++++++++++++++++++++++++++++
 4 files changed, 64 insertions(+), 12 deletions(-)
 create mode 100644 yosys-config.in

diff --git a/.gitignore b/.gitignore
index ed71c784..1d44e72a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,5 +5,7 @@ qtcreator.includes
 qtcreator.config
 qtcreator.creator
 qtcreator.creator.user
+Makefile.conf
 filterlib
 yosys
+yosys-config
diff --git a/Makefile b/Makefile
index 392d50f6..f8ba724c 100644
--- a/Makefile
+++ b/Makefile
@@ -12,13 +12,13 @@ OBJS += libs/sha1/sha1.o
 OBJS += libs/subcircuit/subcircuit.o
 
 GENFILES =
-TARGETS = yosys
+TARGETS = yosys yosys-config
 
 all: top-all
 
-CXXFLAGS = -Wall -Wextra -ggdb -I$(shell pwd) -MD -D_YOSYS_
-LDFLAGS =
-LDLIBS = -lstdc++ -lreadline -lm
+CXXFLAGS = -Wall -Wextra -ggdb -I"$(shell pwd)" -MD -D_YOSYS_ -fPIC
+LDFLAGS = -rdynamic
+LDLIBS = -lstdc++ -lreadline -lm -ldl
 
 -include Makefile.conf
 
@@ -47,6 +47,10 @@ top-all: $(TARGETS)
 yosys: $(OBJS)
 	$(CXX) -o yosys $(LDFLAGS) $(OBJS) $(LDLIBS)
 
+yosys-config: yosys-config.in
+	sed 's,@CXX@,$(CXX),; s,@CXXFLAGS@,$(CXXFLAGS),; s,@LDFLAGS@,$(LDFLAGS),; s,@LDLIBS@,$(LDLIBS),;' < yosys-config.in > yosys-config
+	chmod +x yosys-config
+
 test: yosys
 	cd tests/simple && bash run-test.sh
 	cd tests/hana && bash run-test.sh
@@ -54,6 +58,7 @@ test: yosys
 
 install: yosys
 	install yosys /usr/local/bin/yosys
+	install yosys-config /usr/local/bin/yosys-config
 
 clean:
 	rm -f $(OBJS) $(GENFILES) $(TARGETS)
diff --git a/kernel/driver.cc b/kernel/driver.cc
index 8a5cb822..8ba0283f 100644
--- a/kernel/driver.cc
+++ b/kernel/driver.cc
@@ -26,6 +26,7 @@
 #include "kernel/log.h"
 #include <string.h>
 #include <unistd.h>
+#include <dlfcn.h>
 
 static void run_frontend(std::string filename, std::string command, RTLIL::Design *design, std::string *backend_command)
 {
@@ -224,21 +225,23 @@ int main(int argc, char **argv)
 	std::string frontend_command = "auto";
 	std::string backend_command = "auto";
 	std::vector<std::string> passes_commands;
+	std::vector<void*> loaded_modules;
 	std::string output_filename = "-";
 	std::string scriptfile = "";
 	bool got_output_filename = false;
 
-	Pass::init_register();
-
-	RTLIL::Design *design = new RTLIL::Design;
-	design->selection_stack.push_back(RTLIL::Selection());
-	log_push();
-
 	int opt;
-	while ((opt = getopt(argc, argv, "f:b:o:p:l:qts:")) != -1)
+	while ((opt = getopt(argc, argv, "m:f:b:o:p:l:qts:")) != -1)
 	{
 		switch (opt)
 		{
+		case 'm':
+			loaded_modules.push_back(dlopen(optarg, RTLD_LAZY|RTLD_GLOBAL));
+			if (loaded_modules.back() == NULL) {
+				fprintf(stderr, "Can't load module `%s'!\n", optarg);
+				exit(1);
+			}
+			break;
 		case 'f':
 			frontend_command = optarg;
 			break;
@@ -271,7 +274,7 @@ int main(int argc, char **argv)
 		default:
 			fprintf(stderr, "\n");
 			fprintf(stderr, "Usage: %s [-q] [-t] [-l logfile] [-o <outfile>] [-f <frontend>] [-s <scriptfile>]\n", argv[0]);
-			fprintf(stderr, "       %*s[-p <pass> [-p ..]] [-b <backend>] [<infile> [..]]\n", int(strlen(argv[0])+1), "");
+			fprintf(stderr, "       %*s[-p <pass> [-p ..]] [-b <backend>] [-m <module_file>] [<infile> [..]]\n", int(strlen(argv[0])+1), "");
 			fprintf(stderr, "\n");
 			fprintf(stderr, "    -q\n");
 			fprintf(stderr, "        quiet operation. only write error messages to console\n");
@@ -297,6 +300,9 @@ int main(int argc, char **argv)
 			fprintf(stderr, "    -p command\n");
 			fprintf(stderr, "        execute the commands\n");
 			fprintf(stderr, "\n");
+			fprintf(stderr, "    -m module_file\n");
+			fprintf(stderr, "        load the specified module (aka plugin)\n");
+			fprintf(stderr, "\n");
 			fprintf(stderr, "For more complex synthesis jobs it is recommended to use the read_* and write_*\n");
 			fprintf(stderr, "commands in a script file instead of specifying input and output files on the\n");
 			fprintf(stderr, "command line.\n");
@@ -334,6 +340,12 @@ int main(int argc, char **argv)
 	log(" \\-----------------------------------------------------------------------------/\n");
 	log("\n");
 
+	Pass::init_register();
+
+	RTLIL::Design *design = new RTLIL::Design;
+	design->selection_stack.push_back(RTLIL::Selection());
+	log_push();
+
 	if (optind == argc && passes_commands.size() == 0 && scriptfile.empty()) {
 		if (!got_output_filename)
 			backend_command = "";
@@ -365,6 +377,9 @@ int main(int argc, char **argv)
 
 	Pass::done_register();
 
+	for (auto mod : loaded_modules)
+		dlclose(mod);
+
 	return 0;
 }
 
diff --git a/yosys-config.in b/yosys-config.in
new file mode 100644
index 00000000..d67d881c
--- /dev/null
+++ b/yosys-config.in
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+help() {
+	{ echo; echo "Usage: $0 { --cxx | --cxxflags | --ldflags | --ldlibs }"; } >&2
+	exit 1
+}
+
+if [ $# -eq 0 ]; then
+	help
+fi
+
+for opt; do
+	case "$opt" in
+		--cxx)
+			echo -n '@CXX@ ' ;;
+		--cxxflags)
+			echo -n '@CXXFLAGS@ ' ;;
+		--ldflags)
+			echo -n '@LDFLAGS@ ' ;;
+		--ldlibs)
+			echo -n '@LDLIBS@ ' ;;
+		--help|-\?)
+			help ;;
+		*)
+			echo -n "$opt "
+	esac
+done
+echo
+
+exit 0
-- 
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