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https://github.com/nspcc-dev/neo-go.git
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vmcli: set breakpoint before the instruction
Breakpoint should occur before actual instruction execution.
This commit is contained in:
parent
4a8259caea
commit
5d6065c3ee
3 changed files with 29 additions and 11 deletions
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@ -213,8 +213,13 @@ func handleIP(c *ishell.Context) {
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return
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}
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v := getVMFromContext(c)
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ip, opcode := v.Context().CurrInstr()
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c.Printf("instruction pointer at %d (%s)\n", ip, opcode)
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ctx := v.Context()
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if ctx.NextIP() < ctx.LenInstr() {
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ip, opcode := v.Context().NextInstr()
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c.Printf("instruction pointer at %d (%s)\n", ip, opcode)
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} else {
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c.Println("execution has finished")
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}
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}
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func handleBreak(c *ishell.Context) {
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@ -319,7 +324,6 @@ func runVMWithHandling(c *ishell.Context, v *vm.VM) {
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err := v.Run()
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if err != nil {
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c.Err(err)
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return
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}
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checkAndPrintVMState(c, v)
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}
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@ -331,16 +335,20 @@ func checkAndPrintVMState(c *ishell.Context, v *vm.VM) {
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var message string
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switch {
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case v.HasFailed():
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message = "FAILED"
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message = "" // the error will be printed on return
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case v.HasHalted():
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message = v.Stack("estack")
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case v.AtBreakpoint():
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ctx := v.Context()
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i, op := ctx.CurrInstr()
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message = fmt.Sprintf("at breakpoint %d (%s)\n", i, op.String())
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if ctx.NextIP() < ctx.LenInstr() {
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i, op := ctx.NextInstr()
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message = fmt.Sprintf("at breakpoint %d (%s)", i, op)
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} else {
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message = "execution has finished"
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}
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}
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if message != "" {
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c.Printf(message)
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c.Println(message)
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}
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}
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@ -412,8 +420,9 @@ func handleStepType(c *ishell.Context, stepType string) {
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}
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if err != nil {
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c.Err(err)
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} else {
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handleIP(c)
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}
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handleIP(c)
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changePrompt(c, v)
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}
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@ -426,8 +435,8 @@ func handleOps(c *ishell.Context) {
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}
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func changePrompt(c ishell.Actions, v *vm.VM) {
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if v.Ready() && v.Context().IP()-1 >= 0 {
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c.SetPrompt(fmt.Sprintf("NEO-GO-VM %d > ", v.Context().IP()-1))
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if v.Ready() && v.Context().NextIP() >= 0 && v.Context().NextIP() < v.Context().LenInstr() {
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c.SetPrompt(fmt.Sprintf("NEO-GO-VM %d > ", v.Context().NextIP()))
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} else {
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c.SetPrompt("NEO-GO-VM > ")
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}
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@ -143,6 +143,15 @@ func (c *Context) CurrInstr() (int, opcode.Opcode) {
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return c.ip, opcode.Opcode(c.prog[c.ip])
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}
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// NextInstr returns the next instruction and opcode.
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func (c *Context) NextInstr() (int, opcode.Opcode) {
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op := opcode.RET
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if c.nextip < len(c.prog) {
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op = opcode.Opcode(c.prog[c.nextip])
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}
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return c.nextip, op
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}
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// Copy returns an new exact copy of c.
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func (c *Context) Copy() *Context {
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ctx := new(Context)
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@ -228,7 +228,7 @@ func (v *VM) AddBreakPoint(n int) {
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// instruction pointer.
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func (v *VM) AddBreakPointRel(n int) {
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ctx := v.Context()
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v.AddBreakPoint(ctx.ip + n)
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v.AddBreakPoint(ctx.nextip + n)
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}
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// LoadFile loads a program from the given path, ready to execute it.
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