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vm: update and move README, refs. #339
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Roman Khimov
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2 changed files with 57 additions and 47 deletions
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@ -25,7 +25,7 @@ A complete toolkit for the NEO blockchain, including:
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- [RPC node & client](https://github.com/nspcc-dev/neo-go/tree/master/docs/rpc.md)
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- [CLI tool](https://github.com/nspcc-dev/neo-go/blob/master/docs/cli.md)
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- [Smart contract compiler](https://github.com/nspcc-dev/neo-go/blob/master/docs/compiler.md)
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- [NEO virtual machine](https://github.com/nspcc-dev/neo-go/blob/master/pkg/vm/README.md)
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- [NEO virtual machine](https://github.com/nspcc-dev/neo-go/blob/master/docs/vm.md)
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# Getting started
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@ -4,28 +4,16 @@ 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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VM is provided as part of neo-go binary, so usual neo-go build instructions
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are applicable.
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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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# Running the VM
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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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$ ./bin/neo-go vm
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```
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_ ____________ __________ _ ____ ___
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/ | / / ____/ __ \ / ____/ __ \ | | / / |/ /
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/ |/ / __/ / / / /_____/ / __/ / / /____| | / / /|_/ /
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@ -36,9 +24,6 @@ Start the virtual machine:
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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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@ -51,24 +36,39 @@ More information about standalone installation coming soon.
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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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Commands:
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astack Show alt stack contents
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break Place a breakpoint
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clear clear the screen
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cont Continue execution of the current loaded script
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estack Show evaluation stack contents
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exit Exit the VM prompt
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help display help
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ip Show current instruction
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istack Show invocation stack contents
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loadavm Load an avm script into the VM
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loadgo Compile and load a Go file into the VM
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loadhex Load a hex-encoded script string into the VM
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ops Dump 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
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```
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### Loading in your script
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You can get help for each command and its parameters adding `help` as a
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parameter to the command:
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```
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NEO-GO-VM > step help
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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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```
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## Loading in your script
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To load an avm script into the VM:
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@ -111,7 +111,7 @@ NEO-GO-VM > run
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```
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### Running programs with arguments
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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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@ -146,7 +146,10 @@ func rollDice(number int) {
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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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The first parameter (called method or operation) is always of type
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string. Notice that arguments can have different types, they can inferred
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automatically (please refer to the `run` command help), but in you need to
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pass parameter of specific type you can specify it in `run`'s arguments:
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```
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NEO-GO-VM > run rollDice int:1
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@ -154,45 +157,52 @@ NEO-GO-VM > run rollDice int:1
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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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To add more than 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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Currently supported types:
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- `bool (bool:false and bool:true)`
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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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## Debugging
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The `neo-go-vm` provides a debugger to inspect your program in-depth.
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### Stepping through the program
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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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at breakpoint 3 (DUPFROMALTSTACK)
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NEO-GO-VM 3 >
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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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NEO-GO-VM 3 > step
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at breakpoint 4 (PUSH0)
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NEO-GO-VM 4 >
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```
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### Breakpoints
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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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at breakpoint 10 (SETITEM)
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NEO-GO-VM 10 > cont
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```
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## Inspecting stack
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Inspecting the evaluation stack:
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```
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