neo-go/pkg/compiler/compiler.go

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package compiler
import (
"bytes"
"encoding/json"
"fmt"
"go/parser"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"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
// The name of the output for debug info.
DebugInfo string
}
type buildInfo struct {
initialPackage string
program *loader.Program
}
func getBuildInfo(src interface{}) (*buildInfo, error) {
conf := loader.Config{ParserMode: parser.ParseComments}
f, err := conf.ParseFile("", src)
if err != nil {
return nil, err
}
conf.CreateFromFiles("", f)
prog, err := conf.Load()
if err != nil {
return nil, err
}
return &buildInfo{
initialPackage: f.Name.Name,
program: prog,
}, nil
}
// Compile compiles a Go program into bytecode that can run on the NEO virtual machine.
func Compile(r io.Reader) ([]byte, error) {
buf, _, err := CompileWithDebugInfo(r)
if err != nil {
return nil, err
}
return buf, nil
}
// CompileWithDebugInfo compiles a Go program into bytecode and emits debug info.
func CompileWithDebugInfo(r io.Reader) ([]byte, *DebugInfo, error) {
ctx, err := getBuildInfo(r)
if err != nil {
return nil, nil, err
}
return CodeGen(ctx)
}
// CompileAndSave will compile and save the file to disk.
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func CompileAndSave(src string, o *Options) ([]byte, error) {
if !strings.HasSuffix(src, ".go") {
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return nil, 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 {
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return nil, err
}
b, di, err := CompileWithDebugInfo(bytes.NewReader(b))
if err != nil {
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return nil, fmt.Errorf("error while trying to compile smart contract file: %v", err)
}
out := fmt.Sprintf("%s.%s", o.Outfile, o.Ext)
err = ioutil.WriteFile(out, b, os.ModePerm)
if o.DebugInfo == "" {
return b, err
}
p, err := filepath.Abs(src)
if err != nil {
return b, err
}
di.Documents = append(di.Documents, p)
data, err := json.Marshal(di)
if err != nil {
return b, err
}
return b, ioutil.WriteFile(o.DebugInfo, data, os.ModePerm)
}