From a96c775a7301645b27486a5e663c75fca460f577 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Sun, 7 Jan 2018 16:36:13 +0100
Subject: Add support for "yosys -E"

Signed-off-by: Clifford Wolf <clifford@clifford.at>
---
 frontends/ast/simplify.cc    |  1 +
 frontends/verilog/preproc.cc |  6 ++++--
 kernel/driver.cc             | 27 ++++++++++++++++++++++++++-
 kernel/register.cc           |  2 ++
 kernel/yosys.cc              |  6 +++++-
 kernel/yosys.h               |  3 +++
 passes/cmds/qwp.cc           |  1 +
 passes/cmds/select.cc        |  2 ++
 passes/cmds/show.cc          |  5 +++++
 passes/cmds/stat.cc          |  1 +
 passes/cmds/tee.cc           |  1 +
 passes/cmds/write_file.cc    |  1 +
 passes/techmap/techmap.cc    |  1 +
 13 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc
index f61f7cf7c..c454fb907 100644
--- a/frontends/ast/simplify.cc
+++ b/frontends/ast/simplify.cc
@@ -2638,6 +2638,7 @@ AstNode *AstNode::readmem(bool is_readmemh, std::string mem_filename, AstNode *m
 
 	std::ifstream f;
 	f.open(mem_filename.c_str());
+	yosys_input_files.insert(mem_filename);
 
 	if (f.fail())
 		log_error("Can not open file `%s` for %s at %s:%d.\n", mem_filename.c_str(), str.c_str(), filename.c_str(), linenum);
diff --git a/frontends/verilog/preproc.cc b/frontends/verilog/preproc.cc
index 00bdcee43..c43ff4e3a 100644
--- a/frontends/verilog/preproc.cc
+++ b/frontends/verilog/preproc.cc
@@ -400,10 +400,12 @@ std::string frontend_verilog_preproc(std::istream &f, std::string filename, cons
 					if (!ff.fail()) break;
 				}
 			}
-			if (ff.fail())
+			if (ff.fail()) {
 				output_code.push_back("`file_notfound " + fn);
-			else
+			} else {
 				input_file(ff, fixed_fn);
+				yosys_input_files.insert(fixed_fn);
+			}
 			continue;
 		}
 
diff --git a/kernel/driver.cc b/kernel/driver.cc
index c5e31d718..f49f6023b 100644
--- a/kernel/driver.cc
+++ b/kernel/driver.cc
@@ -160,6 +160,7 @@ int main(int argc, char **argv)
 	std::vector<std::string> plugin_filenames;
 	std::string output_filename = "";
 	std::string scriptfile = "";
+	std::string depsfile = "";
 	bool scriptfile_tcl = false;
 	bool got_output_filename = false;
 	bool print_banner = true;
@@ -256,6 +257,9 @@ int main(int argc, char **argv)
 		printf("        if a warning message matches the regex, it is printes as regular\n");
 		printf("        message instead.\n");
 		printf("\n");
+		printf("    -E <depsfile>\n");
+		printf("        write a Makefile dependencies file with in- and output file names\n");
+		printf("\n");
 		printf("    -V\n");
 		printf("        print version information and exit\n");
 		printf("\n");
@@ -276,7 +280,7 @@ int main(int argc, char **argv)
 	}
 
 	int opt;
-	while ((opt = getopt(argc, argv, "MXAQTVSm:f:Hh:b:o:p:l:L:qv:tds:c:W:w:D:")) != -1)
+	while ((opt = getopt(argc, argv, "MXAQTVSm:f:Hh:b:o:p:l:L:qv:tds:c:W:w:D:E:")) != -1)
 	{
 		switch (opt)
 		{
@@ -392,6 +396,9 @@ int main(int argc, char **argv)
 				}
 			}
 			break;
+		case 'E':
+			depsfile = optarg;
+			break;
 		default:
 			fprintf(stderr, "Run '%s -h' for help.\n", argv[0]);
 			exit(1);
@@ -442,6 +449,24 @@ int main(int argc, char **argv)
 	if (!backend_command.empty())
 		run_backend(output_filename, backend_command);
 
+	if (!depsfile.empty())
+	{
+		FILE *f = fopen(depsfile.c_str(), "wt");
+		if (f == nullptr)
+			log_error("Can't open dependencies file for writing: %s\n", strerror(errno));
+		bool first = true;
+		for (auto fn : yosys_output_files) {
+			fprintf(f, "%s%s", first ? "" : " ", fn.c_str());
+			first = false;
+		}
+		fprintf(f, ":");
+		for (auto fn : yosys_input_files) {
+			if (yosys_output_files.count(fn) == 0)
+				fprintf(f, " %s", fn.c_str());
+		}
+		fprintf(f, "\n");
+	}
+
 	if (print_stats)
 	{
 		std::string hash = log_hasher->final().substr(0, 10);
diff --git a/kernel/register.cc b/kernel/register.cc
index 983577682..e30414f44 100644
--- a/kernel/register.cc
+++ b/kernel/register.cc
@@ -428,6 +428,7 @@ void Frontend::extra_args(std::istream *&f, std::string &filename, std::vector<s
 			}
 			std::ifstream *ff = new std::ifstream;
 			ff->open(filename.c_str());
+			yosys_input_files.insert(filename);
 			if (ff->fail())
 				delete ff;
 			else
@@ -543,6 +544,7 @@ void Backend::extra_args(std::ostream *&f, std::string &filename, std::vector<st
 		filename = arg;
 		std::ofstream *ff = new std::ofstream;
 		ff->open(filename.c_str(), std::ofstream::trunc);
+		yosys_output_files.insert(filename);
 		if (ff->fail()) {
 			delete ff;
 			log_cmd_error("Can't open output file `%s' for writing: %s\n", filename.c_str(), strerror(errno));
diff --git a/kernel/yosys.cc b/kernel/yosys.cc
index 34665a0ad..987ebcdce 100644
--- a/kernel/yosys.cc
+++ b/kernel/yosys.cc
@@ -64,6 +64,8 @@ CellTypes yosys_celltypes;
 Tcl_Interp *yosys_tcl_interp = NULL;
 #endif
 
+std::set<std::string> yosys_input_files, yosys_output_files;
+
 bool memhasher_active = false;
 uint32_t memhasher_rng = 123456;
 std::vector<void*> memhasher_store;
@@ -831,8 +833,10 @@ void run_frontend(std::string filename, std::string command, std::string *backen
 
 		FILE *f = stdin;
 
-		if (filename != "-")
+		if (filename != "-") {
 			f = fopen(filename.c_str(), "r");
+			yosys_input_files.insert(filename);
+		}
 
 		if (f == NULL)
 			log_error("Can't open script file `%s' for reading: %s\n", filename.c_str(), strerror(errno));
diff --git a/kernel/yosys.h b/kernel/yosys.h
index 5ec681b32..14cbcd610 100644
--- a/kernel/yosys.h
+++ b/kernel/yosys.h
@@ -305,6 +305,9 @@ void run_frontend(std::string filename, std::string command, RTLIL::Design *desi
 void run_backend(std::string filename, std::string command, RTLIL::Design *design = nullptr);
 void shell(RTLIL::Design *design);
 
+// journal of all input and output files read (for "yosys -E")
+extern std::set<std::string> yosys_input_files, yosys_output_files;
+
 // from kernel/version_*.o (cc source generated from Makefile)
 extern const char *yosys_version_str;
 
diff --git a/passes/cmds/qwp.cc b/passes/cmds/qwp.cc
index 1b800b6df..f2dfa760e 100644
--- a/passes/cmds/qwp.cc
+++ b/passes/cmds/qwp.cc
@@ -835,6 +835,7 @@ struct QwpPass : public Pass {
 			}
 			if (args[argidx] == "-dump" && argidx+1 < args.size()) {
 				config.dump_file.open(args[++argidx], std::ofstream::trunc);
+				yosys_output_files.insert(args[argidx]);
 				continue;
 			}
 			break;
diff --git a/passes/cmds/select.cc b/passes/cmds/select.cc
index 7d2f4262b..ae301040a 100644
--- a/passes/cmds/select.cc
+++ b/passes/cmds/select.cc
@@ -1263,6 +1263,7 @@ struct SelectPass : public Pass {
 				log_cmd_error("Option -read can not be combined with a selection expression.\n");
 
 			std::ifstream f(read_file);
+			yosys_input_files.insert(read_file);
 			if (f.fail())
 				log_error("Can't open '%s' for reading: %s\n", read_file.c_str(), strerror(errno));
 
@@ -1331,6 +1332,7 @@ struct SelectPass : public Pass {
 			FILE *f = NULL;
 			if (!write_file.empty()) {
 				f = fopen(write_file.c_str(), "w");
+				yosys_output_files.insert(write_file);
 				if (f == NULL)
 					log_error("Can't open '%s' for writing: %s\n", write_file.c_str(), strerror(errno));
 			}
diff --git a/passes/cmds/show.cc b/passes/cmds/show.cc
index 02624cf30..56e1122bf 100644
--- a/passes/cmds/show.cc
+++ b/passes/cmds/show.cc
@@ -681,6 +681,7 @@ struct ShowPass : public Pass {
 		bool flag_enum = false;
 		bool flag_abbreviate = true;
 		bool flag_notitle = false;
+		bool custom_prefix = false;
 		RTLIL::IdString colorattr;
 
 		size_t argidx;
@@ -697,6 +698,7 @@ struct ShowPass : public Pass {
 			}
 			if (arg == "-prefix" && argidx+1 < args.size()) {
 				prefix = args[++argidx];
+				custom_prefix = true;
 				continue;
 			}
 			if (arg == "-color" && argidx+2 < args.size()) {
@@ -782,6 +784,7 @@ struct ShowPass : public Pass {
 		for (auto filename : libfiles) {
 			std::ifstream f;
 			f.open(filename.c_str());
+			yosys_input_files.insert(filename);
 			if (f.fail())
 				log_error("Can't open lib file `%s'.\n", filename.c_str());
 			RTLIL::Design *lib = new RTLIL::Design;
@@ -797,6 +800,8 @@ struct ShowPass : public Pass {
 
 		log("Writing dot description to `%s'.\n", dot_file.c_str());
 		FILE *f = fopen(dot_file.c_str(), "w");
+		if (custom_prefix)
+			yosys_output_files.insert(dot_file);
 		if (f == NULL) {
 			for (auto lib : libs)
 				delete lib;
diff --git a/passes/cmds/stat.cc b/passes/cmds/stat.cc
index a887fbb6a..e52a192db 100644
--- a/passes/cmds/stat.cc
+++ b/passes/cmds/stat.cc
@@ -190,6 +190,7 @@ void read_liberty_cellarea(dict<IdString, double> &cell_area, string liberty_fil
 {
 	std::ifstream f;
 	f.open(liberty_file.c_str());
+	yosys_input_files.insert(liberty_file);
 	if (f.fail())
 		log_cmd_error("Can't open liberty file `%s': %s\n", liberty_file.c_str(), strerror(errno));
 	LibertyParser libparser(f);
diff --git a/passes/cmds/tee.cc b/passes/cmds/tee.cc
index 3db2dbf0e..b68c089e9 100644
--- a/passes/cmds/tee.cc
+++ b/passes/cmds/tee.cc
@@ -65,6 +65,7 @@ struct TeePass : public Pass {
 			if ((args[argidx] == "-o" || args[argidx] == "-a") && argidx+1 < args.size()) {
 				const char *open_mode = args[argidx] == "-o" ? "w" : "a+";
 				FILE *f = fopen(args[++argidx].c_str(), open_mode);
+				yosys_input_files.insert(args[argidx]);
 				if (f == NULL) {
 					for (auto cf : files_to_close)
 						fclose(cf);
diff --git a/passes/cmds/write_file.cc b/passes/cmds/write_file.cc
index b78265933..70892a945 100644
--- a/passes/cmds/write_file.cc
+++ b/passes/cmds/write_file.cc
@@ -67,6 +67,7 @@ struct WriteFileFrontend : public Frontend {
 		extra_args(f, filename, args, argidx);
 
 		FILE *of = fopen(output_filename.c_str(), append_mode ? "a" : "w");
+		yosys_output_files.insert(output_filename);
 		char buffer[64 * 1024];
 		int bytes;
 
diff --git a/passes/techmap/techmap.cc b/passes/techmap/techmap.cc
index d9e81e808..d7756e2cd 100644
--- a/passes/techmap/techmap.cc
+++ b/passes/techmap/techmap.cc
@@ -1095,6 +1095,7 @@ struct TechmapPass : public Pass {
 					std::ifstream f;
 					rewrite_filename(fn);
 					f.open(fn.c_str());
+					yosys_input_files.insert(fn);
 					if (f.fail())
 						log_cmd_error("Can't open map file `%s'\n", fn.c_str());
 					Frontend::frontend_call(map, &f, fn, (fn.size() > 3 && fn.substr(fn.size()-3) == ".il") ? "ilang" : verilog_frontend);
-- 
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