SDC: Get clock wire name from SOURCE_PINS Signed-off-by: Tomasz Michalak <tmichalak@antmicro.com>

diff --git a/sdc-plugin/clocks.cc b/sdc-plugin/clocks.cc
index 95ebaad..adcb6b1 100644
--- a/sdc-plugin/clocks.cc
+++ b/sdc-plugin/clocks.cc

@@ -114,11 +114,18 @@
     return WireName(clock_wire);
 }
 
-std::string Clock::WireName(RTLIL::Wire* wire) {
-    if (!wire) {
+std::string Clock::WireName(RTLIL::Wire* clock_wire) {
+    if (!clock_wire) {
 	return std::string();
     }
-    return AddEscaping(RTLIL::unescape_id(wire->name));
+    return AddEscaping(RTLIL::unescape_id(clock_wire->name));
+}
+
+std::string Clock::SourcePinName(RTLIL::Wire* clock_wire) {
+    if (clock_wire->has_attribute(RTLIL::escape_id("SOURCE_PINS"))) {
+	return clock_wire->get_string_attribute(RTLIL::escape_id("SOURCE_PINS"));
+    }
+    return Name(clock_wire);
 }
 
 const std::map<std::string, RTLIL::Wire*> Clocks::GetClocks(

diff --git a/sdc-plugin/clocks.h b/sdc-plugin/clocks.h
index 2bcdf75..846a2af 100644
--- a/sdc-plugin/clocks.h
+++ b/sdc-plugin/clocks.h

@@ -46,6 +46,7 @@
     static std::string AddEscaping(const std::string& name) {
 	return std::regex_replace(name, std::regex{"\\$"}, "\\$");
     }
+    static std::string SourcePinName(RTLIL::Wire* clock_wire);
 
    private:
     static std::pair<float, float> Waveform(RTLIL::Wire* clock_wire);

diff --git a/sdc-plugin/sdc_writer.cc b/sdc-plugin/sdc_writer.cc
index 80c8e5e..6f7a760 100644
--- a/sdc-plugin/sdc_writer.cc
+++ b/sdc-plugin/sdc_writer.cc

@@ -54,7 +54,7 @@
 	file << "create_clock -period " << Clock::Period(clock_wire);
 	file << " -waveform {" << Clock::RisingEdge(clock_wire) << " "
 	     << Clock::FallingEdge(clock_wire) << "}";
-	file << " " << Clock::WireName(clock_wire);
+	file << " " << Clock::SourcePinName(clock_wire);
 	file << std::endl;
     }
 }