89 lines
1.9 KiB
Go
89 lines
1.9 KiB
Go
package compiler
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import (
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"encoding/gob"
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"io"
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"github.com/d5/tengo/objects"
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)
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// Bytecode is a compiled instructions and constants.
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type Bytecode struct {
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Instructions []byte
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Constants []objects.Object
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}
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// Decode reads Bytecode data from the reader.
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func (b *Bytecode) Decode(r io.Reader) error {
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dec := gob.NewDecoder(r)
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if err := dec.Decode(&b.Instructions); err != nil {
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return err
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}
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if err := dec.Decode(&b.Constants); err != nil {
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return err
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}
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// replace Bool and Undefined with known value
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for i, v := range b.Constants {
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b.Constants[i] = cleanupObjects(v)
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}
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return nil
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}
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// Encode writes Bytecode data to the writer.
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func (b *Bytecode) Encode(w io.Writer) error {
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enc := gob.NewEncoder(w)
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if err := enc.Encode(b.Instructions); err != nil {
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return err
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}
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// constants
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return enc.Encode(b.Constants)
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}
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func cleanupObjects(o objects.Object) objects.Object {
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switch o := o.(type) {
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case *objects.Bool:
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if o.IsFalsy() {
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return objects.FalseValue
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}
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return objects.TrueValue
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case *objects.Undefined:
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return objects.UndefinedValue
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case *objects.Array:
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for i, v := range o.Value {
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o.Value[i] = cleanupObjects(v)
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}
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case *objects.Map:
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for k, v := range o.Value {
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o.Value[k] = cleanupObjects(v)
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}
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}
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return o
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}
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func init() {
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gob.Register(&objects.Int{})
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gob.Register(&objects.Float{})
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gob.Register(&objects.String{})
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gob.Register(&objects.Bool{})
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gob.Register(&objects.Char{})
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gob.Register(&objects.Array{})
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gob.Register(&objects.ImmutableArray{})
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gob.Register(&objects.Map{})
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gob.Register(&objects.ImmutableMap{})
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gob.Register(&objects.CompiledFunction{})
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gob.Register(&objects.Undefined{})
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gob.Register(&objects.Error{})
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gob.Register(&objects.Bytes{})
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gob.Register(&objects.StringIterator{})
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gob.Register(&objects.MapIterator{})
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gob.Register(&objects.ArrayIterator{})
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gob.Register(&objects.Time{})
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gob.Register(&objects.CompiledModule{})
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}
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