Created
December 8, 2020 21:56
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| package main | |
| import ( | |
| vm "aoc/vm" | |
| "fmt" | |
| "os" | |
| ) | |
| func main() { | |
| if len(os.Args) < 2 { | |
| panic(fmt.Sprintf("usage: %s <input>", os.Args[0])) | |
| } | |
| fh, err := os.Open(os.Args[1]) | |
| if err != nil { | |
| panic(err) | |
| } | |
| v0 := vm.NewVM() | |
| err = v0.LoadCode(fh) | |
| if err != nil { | |
| panic(err) | |
| } | |
| // part 1 | |
| v1 := v0.Clone() | |
| v1.Run(doneOnInfinite) | |
| fmt.Printf("part 1: accumulator=%d\n", v1.Accumulator()) | |
| // part 2 | |
| var i2 *vm.Instruction | |
| var v2 *vm.VM | |
| for k, i := range v0.Code() { | |
| switch i.Op { | |
| case "jmp": | |
| i2 = i.Clone() | |
| i2.Op = "nop" | |
| i2.Func = vm.NopFunc | |
| case "nop": | |
| i2 = i.Clone() | |
| i2.Op = "jmp" | |
| i2.Func = vm.JmpFunc | |
| default: | |
| continue | |
| } | |
| v2 = v0.Clone() | |
| err = v2.SetInstruction(k, i2) | |
| if err != nil { | |
| panic(err) | |
| } | |
| v2.Run(doneOnInfinite) | |
| if !v2.IsInfinite() { | |
| break | |
| } | |
| } | |
| switch { | |
| case v2==nil: | |
| fmt.Println("part 2: There were no nop:s or jmp:s in the code") | |
| case v2.IsInfinite(): | |
| fmt.Println("part 2: I didn't find any finite execution") | |
| default: | |
| fmt.Printf("part 2: The program exited normally, accumulator=%d\n", v2.Accumulator()) | |
| } | |
| } | |
| func doneOnInfinite(v *vm.VM) bool { | |
| return v.IsInfinite() | |
| } |
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