systemc: Add some error checks to sc_clock.

The Accellera version reports an error if the period, high or low
portions of the clock are zero.

Change-Id: I2cbb7c3a1b6abe4d969ef875ebf8754d2d1c489a
Reviewed-on: https://gem5-review.googlesource.com/c/13303
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

diff --git a/src/systemc/channel/sc_clock.cc b/src/systemc/channel/sc_clock.cc
index f67d2565d812bb01b7e31a8f587f3e4d67c5ca87..898e7b8660b0836d04c4fe964071ac9bfd6c62fa 100644 (file)
--- a/src/systemc/channel/sc_clock.cc
+++ b/src/systemc/channel/sc_clock.cc
@@ -38,6 +38,7 @@
 #include "systemc/ext/channel/sc_clock.hh"
 #include "systemc/ext/core/sc_main.hh"
 #include "systemc/ext/core/sc_module.hh" // for sc_gen_unique_name
+#include "systemc/ext/utils/sc_report_handler.hh"
 
 namespace sc_gem5
 {
@@ -108,6 +109,27 @@ sc_clock::sc_clock(const char *name, const sc_time &period,
     _period(period), _dutyCycle(duty_cycle), _startTime(start_time),
     _posedgeFirst(posedge_first)
 {
+    if (period == SC_ZERO_TIME) {
+        std::string msg =
+            "increase the period: clock '" +
+            std::string(name) + "'";
+        SC_REPORT_ERROR("(E101) sc_clock period is zero", msg.c_str());
+    }
+
+    if (duty_cycle * period == SC_ZERO_TIME) {
+        std::string msg =
+            "increase the period or increase the duty cycle: clock '" +
+            std::string(name) + "'";
+        SC_REPORT_ERROR("(E102) sc_clock high time is zero", msg.c_str());
+    }
+
+    if (duty_cycle * period == period) {
+        std::string msg =
+            "increase the period or decrease the duty cycle: clock '" +
+            std::string(name) + "'";
+        SC_REPORT_ERROR("(E103) sc_clock low time is zero", msg.c_str());
+    }
+
     _gem5UpEdge = new ::sc_gem5::ClockTick(this, true, period);
     _gem5DownEdge = new ::sc_gem5::ClockTick(this, false, period);
 }