package compiler import ( "bytes" "encoding/hex" "fmt" "go/ast" "go/build" "go/parser" "go/types" "io" "io/ioutil" "log" "os" "strings" "text/tabwriter" "github.com/CityOfZion/neo-go/pkg/vm" "golang.org/x/tools/go/loader" ) const fileExt = "avm" // Options contains all the parameters that affect the behaviour of the compiler. type Options struct { // The extension of the output file default set to .avm Ext string // The name of the output file. Outfile string // Debug will output an hex encoded string of the generated bytecode. Debug bool } type buildInfo struct { initialPackage string program *loader.Program } // Compile compiles a Go program into bytecode that can run on the NEO virtual machine. func Compile(r io.Reader, o *Options) ([]byte, error) { conf := loader.Config{ParserMode: parser.ParseComments} f, err := conf.ParseFile("", r) if err != nil { return nil, err } conf.CreateFromFiles("", f) prog, err := conf.Load() if err != nil { return nil, err } ctx := &buildInfo{ initialPackage: f.Name.Name, program: prog, } buf, err := CodeGen(ctx) if err != nil { return nil, err } return buf.Bytes(), nil } type archive struct { f *ast.File typeInfo *types.Info } // CompileAndSave will compile and save the file to disk. func CompileAndSave(src string, o *Options) error { if !strings.HasSuffix(src, ".go") { return fmt.Errorf("%s is not a Go file", src) } o.Outfile = strings.TrimSuffix(o.Outfile, fmt.Sprintf(".%s", fileExt)) if len(o.Outfile) == 0 { o.Outfile = strings.TrimSuffix(src, ".go") } if len(o.Ext) == 0 { o.Ext = fileExt } b, err := ioutil.ReadFile(src) if err != nil { return err } b, err = Compile(bytes.NewReader(b), o) if err != nil { return fmt.Errorf("Error while trying to compile smart contract file: %v", err) } log.Println(hex.EncodeToString(b)) out := fmt.Sprintf("%s.%s", o.Outfile, o.Ext) return ioutil.WriteFile(out, b, os.ModePerm) } // CompileAndInspect compiles the program and dumps the opcode in a user friendly format. func CompileAndInspect(src string) error { b, err := ioutil.ReadFile(src) if err != nil { return err } b, err = Compile(bytes.NewReader(b), &Options{}) if err != nil { return err } w := tabwriter.NewWriter(os.Stdout, 0, 0, 4, ' ', 0) fmt.Fprintln(w, "INDEX\tOPCODE\tDESC\t") for i := 0; i <= len(b)-1; { instr := vm.Instruction(b[i]) paramlength := 0 fmt.Fprintf(w, "%d\t0x%x\t%s\t\n", i, b[i], instr) i++ if instr >= vm.PUSHBYTES1 && instr <= vm.PUSHBYTES75 { paramlength = int(instr) } if instr == vm.JMP || instr == vm.JMPIF || instr == vm.JMPIFNOT || instr == vm.CALL { paramlength = 2 } for x := 0; x < paramlength; x++ { fmt.Fprintf(w, "%d\t0x%x\t%s\t\n", i, b[i+1+x], string(b[i+1+x])) } i += paramlength } w.Flush() return nil } func gopath() string { gopath := os.Getenv("GOPATH") if len(gopath) == 0 { gopath = build.Default.GOPATH } return gopath } func init() { log.SetFlags(0) }