cmd,mipsevm: improve stats reporting

cmd/run.go

@@ -244,15 +244,22 @@ func Run(ctx *cli.Context) error {
 		stepFn = Guard(po.cmd.ProcessState, stepFn)
 	}
 
+	start := time.Now()
+	startStep := state.Step
+
 	for !state.Exited {
 		step := state.Step
 
 		name := meta.LookupSymbol(state.PC)
 		if infoAt(state) {
+			delta := time.Since(start)
 			l.Info("processing",
 				"step", step,
 				"pc", mipsevm.HexU32(state.PC),
 				"insn", mipsevm.HexU32(state.Memory.GetMemory(state.PC)),
+				"ips", float64(step-startStep)/(float64(delta)/float64(time.Second)),
+				"pages", len(state.Memory.Pages),
+				"mem", state.Memory.Usage(),
 				"name", name,
 			)
 		}

mipsevm/memory.go

@@ -276,3 +276,18 @@ func (r *memReader) Read(dest []byte) (n int, err error) {
 func (m *Memory) ReadMemoryRange(addr uint32, count uint32) io.Reader {
 	return &memReader{m: m, addr: addr, count: count}
 }
+
+func (m *Memory) Usage() string {
+	total := uint64(len(m.Pages)) * PageSize
+	const unit = 1024
+	if total < unit {
+		return fmt.Sprintf("%d B", total)
+	}
+	div, exp := uint64(unit), 0
+	for n := total / unit; n >= unit; n /= unit {
+		div *= unit
+		exp++
+	}
+	// KiB, MiB, GiB, TiB, ...
+	return fmt.Sprintf("%.1f %ciB", float64(total)/float64(div), "KMGTPE"[exp])
+}