Add old (without --timing) verilator test

test-verilator4/clock_generator.hpp

@@ -0,0 +1,31 @@
+#ifndef _CLOCK_GENERATOR_HPP
+#define _CLOCK_GENERATOR_HPP
+
+#include <cstdint>
+#include <memory>
+
+class ClockGenerator
+{
+protected:
+    struct clock {
+        clock(uint8_t &net, uint64_t period, uint64_t position) :
+            net(net), period(period), position(position), next(NULL),
+            posedge(false), negedge(false) {};
+
+        uint8_t &net;
+        uint64_t period;
+        uint64_t position;
+        bool posedge;
+        bool negedge;
+        clock *next;
+    } *clocks = NULL;
+
+public:
+    ~ClockGenerator();
+    void add_clock(uint8_t &net, uint64_t period, uint64_t skew);
+    uint64_t next_event(void);
+    bool is_posegde(uint8_t &net);
+    bool is_negedge(uint8_t &net);
+};
+
+#endif // _CLOCK_GENERATOR_HPP