sdf: Add basic support for writing SDF files

Signed-off-by: David Shah <dave@ds0.me>

1 files changed, 10 insertions, 0 deletions

diff --git a/common/command.cc b/common/command.cc
index ad5b6c54..f7f804a0 100644
--- a/common/command.cc
+++ b/common/command.cc
@@ -149,6 +149,8 @@ po::options_description CommandHandler::getGeneralOptions()
     general.add_options()("freq", po::value<double>(), "set target frequency for design in MHz");
     general.add_options()("timing-allow-fail", "allow timing to fail in design");
     general.add_options()("no-tmdriv", "disable timing-driven placement");
+    general.add_options()("sdf", po::value<std::string>(), "SDF delay back-annotation file to write");
+
     return general;
 }
 
@@ -336,6 +338,14 @@ int CommandHandler::executeMain(std::unique_ptr<Context> ctx)
             log_error("Saving design failed.\n");
     }
 
+    if (vm.count("sdf")) {
+        std::string filename = vm["sdf"].as<std::string>();
+        std::ofstream f(filename);
+        if (!f)
+            log_error("Failed to open SDF file '%s' for writing.\n", filename.c_str());
+        ctx->writeSDF(f);
+    }
+
 #ifndef NO_PYTHON
     deinit_python();
 #endif