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vm: add unload command

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When execution fails it's the only way to change the prompt showing the
last executed instruction. Example:

```
NEO-GO-VM > loadgo examples/engine/engine.go
READY: loaded 117 instructions
NEO-GO-VM 0 > run
Error: at instruction 3 (SYSCALL): failed to invoke syscall 805851437: syscall not found
NEO-GO-VM 8 > parse
Error: missing argument
NEO-GO-VM 8 > parse 123
Integer to Hex			7b
Integer to Base64		ew==
String to Hex			313233
String to Base64		MTIz

NEO-GO-VM 8 > unload
NEO-GO-VM > exit

```
This commit is contained in:
Anna Shaleva 2022-02-16 18:43:12 +03:00 committed by AnnaShaleva
parent 563c3a4baa
commit e8ec820d2e
2 changed files with 32 additions and 0 deletions
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16
pkg/vm/cli/cli.go
View file

@ -136,6 +136,11 @@ both parameters are mandatory, example:
> loadgo /path/to/file.go`,
Action: handleLoadGo,
},
{
Name: "reset",
Usage: "Unload compiled script from the VM",
Action: handleReset,
},
{
Name: "parse",
Usage: "Parse provided argument and convert it into other possible formats",
@ -288,6 +293,11 @@ func getVMFromContext(app *cli.App) *vm.VM {
return app.Metadata[vmKey].(*vm.VM)
}
func setVMInContext(app *cli.App, v *vm.VM) {
old := getVMFromContext(app)
*old = *v
}
func getManifestFromContext(app *cli.App) *manifest.Manifest {
return app.Metadata[manifestKey].(*manifest.Manifest)
}
@ -466,6 +476,12 @@ func handleLoadGo(c *cli.Context) error {
return nil
}
func handleReset(c *cli.Context) error {
setVMInContext(c.App, vm.New())
changePrompt(c.App)
return nil
}
func getManifestFromFile(name string) (*manifest.Manifest, error) {
bs, err := ioutil.ReadFile(name)
if err != nil {

16
pkg/vm/cli/cli_test.go
View file

@ -641,3 +641,19 @@ func TestExit(t *testing.T) {
e.runProg(t, "exit")
require.True(t, e.exit.Load())
}
func TestReset(t *testing.T) {
script := []byte{byte(opcode.PUSH1)}
e := newTestVMCLI(t)
e.runProg(t,
"loadhex "+hex.EncodeToString(script),
"ops",
"reset",
"ops")
e.checkNextLine(t, "READY: loaded 1 instructions")
e.checkNextLine(t, "INDEX.*OPCODE.*PARAMETER")
e.checkNextLine(t, "0.*PUSH1.*")
e.checkNextLine(t, "")
e.checkError(t, fmt.Errorf("VM is not ready: no program loaded"))
}