461 lines
10 KiB
Go
461 lines
10 KiB
Go
package cli
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import (
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"bytes"
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"encoding/hex"
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"errors"
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"fmt"
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"io/ioutil"
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"os"
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"strconv"
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"strings"
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"github.com/nspcc-dev/neo-go/pkg/compiler"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"gopkg.in/abiosoft/ishell.v2"
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)
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const (
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vmKey = "vm"
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boolType = "bool"
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boolFalse = "false"
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boolTrue = "true"
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intType = "int"
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stringType = "string"
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)
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var commands = []*ishell.Cmd{
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{
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Name: "exit",
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Help: "Exit the VM prompt",
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LongHelp: "Exit the VM prompt",
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Func: handleExit,
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},
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{
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Name: "ip",
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Help: "Show current instruction",
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LongHelp: "Show current instruction",
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Func: handleIP,
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},
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{
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Name: "break",
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Help: "Place a breakpoint",
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LongHelp: `Usage: break <ip>
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<ip> is mandatory parameter, example:
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> break 12`,
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Func: handleBreak,
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},
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{
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Name: "estack",
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Help: "Show evaluation stack contents",
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LongHelp: "Show evaluation stack contents",
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Func: handleXStack,
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},
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{
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Name: "astack",
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Help: "Show alt stack contents",
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LongHelp: "Show alt stack contents",
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Func: handleXStack,
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},
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{
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Name: "istack",
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Help: "Show invocation stack contents",
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LongHelp: "Show invocation stack contents",
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Func: handleXStack,
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},
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{
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Name: "loadavm",
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Help: "Load an avm script into the VM",
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LongHelp: `Usage: loadavm <file>
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<file> is mandatory parameter, example:
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> load /path/to/script.avm`,
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Func: handleLoadAVM,
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},
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{
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Name: "loadhex",
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Help: "Load a hex-encoded script string into the VM",
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LongHelp: `Usage: loadhex <string>
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<string> is mandatory parameter, example:
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> load 006166`,
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Func: handleLoadHex,
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},
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{
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Name: "loadgo",
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Help: "Compile and load a Go file into the VM",
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LongHelp: `Usage: loadhex <file>
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<file> is mandatory parameter, example:
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> load /path/to/file.go`,
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Func: handleLoadGo,
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},
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{
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Name: "run",
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Help: "Execute the current loaded script",
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LongHelp: `Usage: run [<operation> [<parameter>...]]
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<operation> is an operation name, passed as a first parameter to Main() (and it
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can't be 'help' at the moment)
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<parameter> is a parameter (can be repeated multiple times) that can be specified
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as <type>:<value>, where type can be:
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'` + boolType + `': supports '` + boolFalse + `' and '` + boolTrue + `' values
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'` + intType + `': supports integers as values
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'` + stringType + `': supports strings as values (that are pushed as a byte array
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values to the stack)
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or can be just <value>, for which the type will be detected automatically
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following these rules: '` + boolTrue + `' and '` + boolFalse + `' are treated as respective
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boolean values, everything that can be converted to integer is treated as
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integer and everything else is treated like a string.
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Passing parameters without operation is not supported. Parameters are packed
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into array before they're passed to the script, so effectively 'run' only
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supports contracts with signatures like this:
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func Main(operation string, args []interface{}) interface{}
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Example:
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> run put ` + stringType + `:"Something to put"`,
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Func: handleRun,
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},
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{
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Name: "cont",
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Help: "Continue execution of the current loaded script",
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LongHelp: "Continue execution of the current loaded script",
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Func: handleCont,
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},
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{
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Name: "step",
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Help: "Step (n) instruction in the program",
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LongHelp: `Usage: step [<n>]
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<n> is optional parameter to specify number of instructions to run, example:
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> step 10`,
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Func: handleStep,
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},
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{
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Name: "stepinto",
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Help: "Stepinto instruction to take in the debugger",
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LongHelp: `Usage: stepInto
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example:
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> stepinto`,
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Func: handleStepInto,
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},
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{
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Name: "stepout",
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Help: "Stepout instruction to take in the debugger",
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LongHelp: `Usage: stepOut
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example:
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> stepout`,
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Func: handleStepOut,
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},
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{
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Name: "stepover",
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Help: "Stepover instruction to take in the debugger",
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LongHelp: `Usage: stepOver
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example:
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> stepover`,
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Func: handleStepOver,
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},
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{
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Name: "ops",
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Help: "Dump opcodes of the current loaded program",
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LongHelp: "Dump opcodes of the current loaded program",
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Func: handleOps,
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},
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}
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// VMCLI object for interacting with the VM.
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type VMCLI struct {
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vm *vm.VM
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shell *ishell.Shell
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}
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// New returns a new VMCLI object.
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func New() *VMCLI {
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vmcli := VMCLI{
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vm: vm.New(),
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shell: ishell.New(),
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}
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vmcli.shell.Set(vmKey, vmcli.vm)
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for _, c := range commands {
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vmcli.shell.AddCmd(c)
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}
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changePrompt(vmcli.shell, vmcli.vm)
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return &vmcli
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}
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func getVMFromContext(c *ishell.Context) *vm.VM {
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return c.Get(vmKey).(*vm.VM)
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}
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func checkVMIsReady(c *ishell.Context) bool {
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v := getVMFromContext(c)
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if v == nil || !v.Ready() {
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c.Err(errors.New("VM is not ready: no program loaded"))
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return false
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}
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return true
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}
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func handleExit(c *ishell.Context) {
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c.Println("Bye!")
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os.Exit(0)
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}
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func handleIP(c *ishell.Context) {
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if !checkVMIsReady(c) {
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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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}
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func handleBreak(c *ishell.Context) {
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if !checkVMIsReady(c) {
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return
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}
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v := getVMFromContext(c)
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if len(c.Args) != 1 {
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c.Err(errors.New("missing parameter <ip>"))
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}
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n, err := strconv.Atoi(c.Args[0])
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if err != nil {
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c.Err(fmt.Errorf("argument conversion error: %s", err))
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return
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}
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v.AddBreakPoint(n)
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c.Printf("breakpoint added at instruction %d\n", n)
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}
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func handleXStack(c *ishell.Context) {
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v := getVMFromContext(c)
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c.Println(v.Stack(c.Cmd.Name))
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}
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func handleLoadAVM(c *ishell.Context) {
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v := getVMFromContext(c)
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if err := v.LoadFile(c.Args[0]); err != nil {
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c.Err(err)
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} else {
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c.Printf("READY: loaded %d instructions\n", v.Context().LenInstr())
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}
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changePrompt(c, v)
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}
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func handleLoadHex(c *ishell.Context) {
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v := getVMFromContext(c)
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b, err := hex.DecodeString(c.Args[0])
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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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v.Load(b)
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c.Printf("READY: loaded %d instructions\n", v.Context().LenInstr())
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changePrompt(c, v)
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}
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func handleLoadGo(c *ishell.Context) {
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v := getVMFromContext(c)
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fb, err := ioutil.ReadFile(c.Args[0])
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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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b, err := compiler.Compile(bytes.NewReader(fb))
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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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v.Load(b)
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c.Printf("READY: loaded %d instructions\n", v.Context().LenInstr())
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changePrompt(c, v)
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}
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func handleRun(c *ishell.Context) {
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v := getVMFromContext(c)
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if len(c.Args) != 0 {
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var (
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method []byte
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params []vm.StackItem
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err error
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)
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method = []byte(c.Args[0])
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params, err = parseArgs(c.Args[1:])
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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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v.LoadArgs(method, params)
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}
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runVMWithHandling(c, v)
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changePrompt(c, v)
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}
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// runVMWithHandling runs VM with handling errors and additional state messages.
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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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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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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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}
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if message != "" {
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c.Printf(message)
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}
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}
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func handleCont(c *ishell.Context) {
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if !checkVMIsReady(c) {
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return
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}
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v := getVMFromContext(c)
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runVMWithHandling(c, v)
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changePrompt(c, v)
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}
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func handleStep(c *ishell.Context) {
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var (
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n = 1
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err error
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)
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if !checkVMIsReady(c) {
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return
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}
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v := getVMFromContext(c)
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if len(c.Args) > 0 {
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n, err = strconv.Atoi(c.Args[0])
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if err != nil {
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c.Err(fmt.Errorf("argument conversion error: %s", err))
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return
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}
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}
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v.AddBreakPointRel(n)
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runVMWithHandling(c, v)
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changePrompt(c, v)
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}
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func handleStepInto(c *ishell.Context) {
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handleStepType(c, "into")
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}
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func handleStepOut(c *ishell.Context) {
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handleStepType(c, "out")
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}
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func handleStepOver(c *ishell.Context) {
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handleStepType(c, "over")
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}
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func handleStepType(c *ishell.Context, stepType string) {
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if !checkVMIsReady(c) {
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return
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}
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v := getVMFromContext(c)
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var err error
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switch stepType {
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case "into":
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err = v.StepInto()
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case "out":
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err = v.StepOut()
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case "over":
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err = v.StepOver()
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}
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if err != nil {
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c.Err(err)
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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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func handleOps(c *ishell.Context) {
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if !checkVMIsReady(c) {
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return
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}
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v := getVMFromContext(c)
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v.PrintOps()
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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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} else {
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c.SetPrompt("NEO-GO-VM > ")
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}
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}
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// Run waits for user input from Stdin and executes the passed command.
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func (c *VMCLI) Run() error {
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printLogo(c.shell)
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c.shell.Run()
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return nil
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}
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func isMethodArg(s string) bool {
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return len(strings.Split(s, ":")) == 1
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}
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func parseArgs(args []string) ([]vm.StackItem, error) {
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items := make([]vm.StackItem, len(args))
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for i, arg := range args {
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var typ, value string
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typeAndVal := strings.Split(arg, ":")
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if len(typeAndVal) < 2 {
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if typeAndVal[0] == boolFalse || typeAndVal[0] == boolTrue {
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typ = boolType
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} else if _, err := strconv.Atoi(typeAndVal[0]); err == nil {
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typ = intType
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} else {
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typ = stringType
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}
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value = typeAndVal[0]
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} else {
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typ = typeAndVal[0]
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value = typeAndVal[1]
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}
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switch typ {
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case boolType:
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if value == boolFalse {
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items[i] = vm.NewBoolItem(false)
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} else if value == boolTrue {
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items[i] = vm.NewBoolItem(true)
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} else {
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return nil, errors.New("failed to parse bool parameter")
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}
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case intType:
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val, err := strconv.ParseInt(value, 10, 64)
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if err != nil {
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return nil, err
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}
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items[i] = vm.NewBigIntegerItem(val)
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case stringType:
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items[i] = vm.NewByteArrayItem([]byte(value))
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}
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}
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return items, nil
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}
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func printLogo(c *ishell.Shell) {
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logo := `
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_ ____________ __________ _ ____ ___
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/ | / / ____/ __ \ / ____/ __ \ | | / / |/ /
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/ |/ / __/ / / / /_____/ / __/ / / /____| | / / /|_/ /
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/ /| / /___/ /_/ /_____/ /_/ / /_/ /_____/ |/ / / / /
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/_/ |_/_____/\____/ \____/\____/ |___/_/ /_/
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`
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c.Print(logo)
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c.Println()
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c.Println()
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}
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