Set up simple DPI for trace-driven testing

src/main/resources/csrc/SimMemTrace.cc

@@ -0,0 +1,22 @@
+#include <vpi_user.h>
+#include <svdpi.h>
+
+#include <stdio.h>
+#include <string.h>
+
+extern "C" void memtrace_init(
+        const char *filename)
+{
+    printf("memtrace_init: filename=[%s]\n", filename);
+}
+
+extern "C" void memtrace_tick(
+        unsigned char *trace_read_valid,
+        unsigned char trace_read_ready,
+        char *trace_read_bits)
+{
+    printf("tick!\n");
+    *trace_read_valid = 1;
+    *trace_read_bits = 42;
+    return;
+}