mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-10-16 15:43:25 +00:00
4bd5b2812e
* support VM to pass method and arguments to a script. * added support for type assertions in smartcontracts. * added native vm support for print. * moved VM API packages to vm -> API * reverted the native Print opcode in favor of runtime.Log * added support for registering custom interop hooks in the VM. * Updated README * Updated compiler with @OPTIMIZE tags * Moved more tests to VM package. * optimized and refactored compiler and vm API * updated README with new smartcontract apis * bumped version
223 lines
4.7 KiB
Markdown
223 lines
4.7 KiB
Markdown
# NEO-GO-VM
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A cross platform virtual machine implementation for `avm` compatible programs.
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# Installation
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## With neo-go
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Install dependencies.
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`neo-go` uses [dep](https://github.com/golang/dep) as its dependency manager. After installing `deps` you can run:
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```
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make deps
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```
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Build the `neo-go` cli:
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```
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make build
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```
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Start the virtual machine:
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```
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./bin/neo-go vm
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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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/_/ |_/_____/\____/ \____/\____/ |___/_/ /_/
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NEO-GO-VM >
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```
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## Standalone
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More information about standalone installation coming soon.
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# Usage
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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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NEO-GO-VM > help
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COMMAND USAGE
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astack show alt stack details
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break place a breakpoint (> break 1)
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cont continue execution of the current loaded script
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estack show evaluation stack details
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exit exit the VM prompt
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help show available commands
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ip show the current instruction
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istack show invocation stack details
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loadavm load an avm script into the VM (> load /path/to/script.avm)
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loadgo compile and load a .go file into the VM (> load /path/to/file.go)
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loadhex load a hex string into the VM (> loadhex 006166 )
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ops show the opcodes of the current loaded program
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run execute the current loaded script
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step step (n) instruction in the program (> step 10)
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```
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### Loading in your script
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To load an avm script into the VM:
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```
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NEO-GO-VM > loadavm ../contract.avm
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READY: loaded 36 instructions
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```
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Run the script:
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```
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NEO-GO-VM > run
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[
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{
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"value": 1,
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"type": "BigInteger"
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}
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]
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```
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You can also directly compile and load `.go` files:
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```
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NEO-GO-VM > loadgo ../contract.go
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READY: loaded 36 instructions
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```
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To make it even more complete, you can directly load hex strings into the VM:
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```
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NEO-GO-VM > loadhex 54c56b006c766b00527ac46c766b00c391640b006203005a616c756662030000616c7566
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READY: loaded 36 instructions
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NEO-GO-VM > run
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[
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{
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"value": 10,
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"type": "BigInteger"
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}
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]
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```
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### Running programs with arguments
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You can invoke smart contracts with arguments. Take the following ***roll the dice*** smartcontract as example.
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```
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package rollthedice
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import "github.com/CityOfZion/neo-go/pkg/vm/api/runtime"
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func Main(method string, args []interface{}) int {
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if method == "rollDice" {
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// args parameter is always of type []interface, hence we need to
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// cast it to an int.
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rollDice(args[0].(int))
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}
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return 0
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}
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func rollDice(number int) {
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if number == 0 {
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runtime.Log("you rolled 0, better luck next time!")
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}
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if number == 1 {
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runtime.Log("you rolled 1, still better then 0!")
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}
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if number == 2 {
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runtime.Log("you rolled 2, coming closer..")
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}
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if number == 3 {
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runtime.Log("Sweet you rolled 3. This dice has only 3 sides o_O")
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}
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}
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```
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To invoke this contract we need to specify both the method and the arguments.
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The first parameter (called method or operation) is always of type string. Notice that arguments can have different types, to make the VM aware of the type we need to specify it when calling `run`:
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```
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NEO-GO-VM > run rollDice int:1
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```
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> The method is always of type string, hence we don't need to specify the type.
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To add more then 1 argument:
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```
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NEO-GO-VM > run someMethod int:1 int:2 string:foo string:bar
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```
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Current supported types:
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- `int (int:1 int:100)`
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- `string (string:foo string:this is a string)`
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### Debugging
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The `neo-go-vm` provides a debugger to inspect your program in-depth.
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Step 4 instructions.
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```
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NEO-GO-VM > step 4
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at breakpoint 4 (Opush4)
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NEO-GO-VM 4 >
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```
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Using just `step` will execute 1 instruction at a time.
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```
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NEO-GO-VM > step
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instruction pointer at 5 (Odup)
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NEO-GO-VM 5 >
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```
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To place breakpoints:
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```
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NEO-GO-VM > break 10
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breakpoint added at instruction 10
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NEO-GO-VM > cont
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at breakpoint 10 (Osetitem)
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NEO-GO-VM 10 > cont
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```
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Inspecting the evaluation stack:
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```
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NEO-GO-VM > estack
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[
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{
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"value": [
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null,
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null,
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null,
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null,
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null,
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null,
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null
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],
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"type": "Array"
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},
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{
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"value": 4,
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"type": "BigInteger"
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}
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]
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```
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There are more stacks that you can inspect.
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- `astack` alt stack
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- `istack` invocation stack
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