diff options
Diffstat (limited to 'vm/vm.go')
| -rw-r--r-- | vm/vm.go | 5 |
1 files changed, 4 insertions, 1 deletions
@@ -55,6 +55,7 @@ const ( Return // [r1 .. ri] -- ; exit frame: sp = fp, fp = pop Sub // n1 n2 -- diff ; diff = n1 - n2 Subi // n1 -- diff ; diff = n1 - $1 + Swap // -- ) // Instruction represents a virtual machine bytecode instruction. @@ -65,7 +66,7 @@ type Instruction struct { } func (i Instruction) String() (s string) { - s = i.Op.String() + s = fmt.Sprintf("%4d: %v", i.Pos, i.Op) var sb strings.Builder for _, a := range i.Arg { sb.WriteString(fmt.Sprintf(" %v", a)) @@ -226,6 +227,8 @@ func (m *Machine) Run() (err error) { mem = mem[:sp-1] case Subi: mem[sp-1] = ValueOf(int(mem[sp-1].Data.Int()) - c.Arg[0]) + case Swap: + mem[sp-2], mem[sp-1] = mem[sp-1], mem[sp-2] case Index: mem[sp-2].Data = mem[sp-1].Data.Index(int(mem[sp-2].Data.Int())) mem = mem[:sp-1] |