vm: add RemoveBreakPoint support

cli/vm/cli.go

@@ -110,6 +110,26 @@
 > break 12`,
 		Action: handleBreak,
 	},
+	{
+		Name:      "delete",
+		Usage:     "Remove a breakpoint",
+		UsageText: `delete <ip>`,
+		Description: `<ip> is mandatory parameter.
+
+Example:
+> delete 12`,
+		Action: handleRemoveBreak,
+	},
+	{
+		Name:      "ib",
+		Usage:     "List breakpoints",
+		UsageText: `ib`,
+		Description: `List breakpoints. 
+
+Example:
+> ib`,
+		Action: handleListBreak,
+	},
 	{
 		Name:      "jump",
 		Usage:     "Jump to the specified instruction (absolute IP value)",
@@ -597,6 +617,33 @@
 	return nil
 }
 
+func handleRemoveBreak(c *cli.Context) error {
+	if !checkVMIsReady(c.App) {
+		return nil
+	}
+	n, err := getInstructionParameter(c)
+	if err != nil {
+		return err
+	}
+
+	v := getVMFromContext(c.App)
+	v.RemoveBreakPoint(n)
+	fmt.Fprintf(c.App.Writer, "breakpoint removed at instruction %d\n", n)
+	return nil
+}
+
+func handleListBreak(c *cli.Context) error {
+	if !checkVMIsReady(c.App) {
+		return nil
+	}
+
+	v := getVMFromContext(c.App)
+	for _, bp := range v.Context().BreakPoints() {
+		fmt.Fprintf(c.App.Writer, "%d\n", bp)
+	}
+	return nil
+}
+
 func handleJump(c *cli.Context) error {
 	if !checkVMIsReady(c.App) {
 		return nil

cli/vm/cli_test.go

@@ -339,6 +339,31 @@ func TestRun_WithNewVMContextAndBreakpoints(t *testing.T) {
 		e.checkNextLine(t, "at breakpoint 10 (ADD)*")
 		e.checkStack(t, 13)
 	})
+	t.Run("contract breakpoints", func(t *testing.T) {
+		src := `package kek
+		func Main(a, b int) int {
+			var c = a + b
+			return c + 5
+		}`
+		tmpDir := t.TempDir()
+		filename := prepareLoadgoSrc(t, tmpDir, src)
+
+		e := newTestVMCLI(t)
+		e.runProgWithTimeout(t, 10*time.Second,
+			"loadgo "+filename,
+			"break 7",
+			"break 8",
+			"ib",
+			"delete 7",
+		)
+
+		e.checkNextLine(t, "READY: loaded \\d* instructions")
+		e.checkNextLine(t, "breakpoint added at instruction 7")
+		e.checkNextLine(t, "breakpoint added at instruction 8")
+		e.checkNextLine(t, "7")
+		e.checkNextLine(t, "8")
+		e.checkNextLine(t, "breakpoint removed at instruction 7")
+	})
 }
 
 // prepareLoadgoSrc prepares provided SC source file for loading into VM via `loadgo` command.

pkg/vm/debug_test.go

@@ -58,4 +58,11 @@ func TestContext_BreakPoints(t *testing.T) {
 	// New context -> clean breakpoints.
 	v.loadScriptWithCallingHash(prog, nil, nil, util.Uint160{}, util.Uint160{}, callflag.All, 1, 3, nil)
 	require.Nil(t, v.Context().BreakPoints())
+
+	v.AddBreakPoint(3)
+	v.AddBreakPoint(3)
+	v.AddBreakPoint(5)
+	require.Equal(t, []int{3, 3, 5}, v.Context().BreakPoints())
+	v.RemoveBreakPoint(3)
+	require.Equal(t, []int{5}, v.Context().BreakPoints())
 }

pkg/vm/vm.go

@@ -275,6 +275,14 @@ func (v *VM) AddBreakPoint(n int) {
 	ctx.sc.breakPoints = append(ctx.sc.breakPoints, n)
 }
 
+// RemoveBreakPoint removes the breakpoint in the current context.
+func (v *VM) RemoveBreakPoint(n int) {
+	ctx := v.Context()
+	ctx.sc.breakPoints = slices.DeleteFunc(ctx.sc.breakPoints, func(i int) bool {
+		return i == n
+	})
+}
+
 // AddBreakPointRel adds a breakpoint relative to the current
 // instruction pointer.
 func (v *VM) AddBreakPointRel(n int) {