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package main
import (
"errors"
"time"
"github.com/perlin-network/life/compiler"
"github.com/perlin-network/life/exec"
)
type Process struct {
Output []byte
}
// ResolveGlobal does nothing, currently.
func (p *Process) ResolveGlobal(module, field string) int64 { return 0 }
// ResolveFunc resolves h's ABI and importable function.
func (p *Process) ResolveFunc(module, field string) exec.FunctionImport {
switch module {
case "h":
switch field {
case "h":
return func(vm *exec.VirtualMachine) int64 {
frame := vm.GetCurrentFrame()
data := frame.Locals[0]
p.Output = append(p.Output, byte(data))
return 0
}
default:
panic("impossible state")
}
default:
panic("impossible state")
}
}
type ExecResult struct {
Output string `json:"out"`
GasUsed uint64 `json:"gas"`
ExecTime time.Duration `json:"exec_duration"`
}
func run(bin []byte) (*ExecResult, error) {
p := &Process{}
var cfg exec.VMConfig
gp := &compiler.SimpleGasPolicy{GasPerInstruction: 1}
vm, err := exec.NewVirtualMachine(bin, cfg, p, gp)
if err != nil {
return nil, err
}
mainFunc, ok := vm.GetFunctionExport("h")
if !ok {
return nil, errors.New("impossible state: no h function exposed")
}
t0 := time.Now()
_, err = vm.Run(mainFunc)
if err != nil {
return nil, err
}
return &ExecResult{
Output: string(p.Output),
GasUsed: vm.Gas,
ExecTime: time.Since(t0),
}, nil
}