minor

README.md

@@ -142,7 +142,7 @@ proc toData(data: var openArray[byte]; pos: var int; input: T)
 proc byteSize(x: T): int {.inline.} ## The size that will be consumed by the serialized type in bytes.
 ```
 
-This is only necessary for destructor-based types.
+This is only necessary for destructor-based types. `mutate`, `default` and `==` must also be defined.
 `drchaos/common` exports read/write procs that assist with this task.
 
 ### What's not supported

drchaos/common.nim

@@ -76,10 +76,10 @@ type
   EncodingDefect = object of Defect
   DecodingDefect = object of Defect
 
-proc raiseEncoding() {.noinline, noreturn.} =
+proc raiseEncoding*() {.noinline, noreturn.} =
   raise newException(EncodingDefect, "Can't write bytes to buffer.")
 
-proc raiseDecoding() {.noinline, noreturn.} =
+proc raiseDecoding*() {.noinline, noreturn.} =
   raise newException(DecodingDefect, "Can't read bytes from buffer.")
 
 proc equals*(a, b: openArray[byte]): bool =

drchaos/mutator.nim

@@ -11,7 +11,7 @@ when (NimMajor, NimMinor, NimPatch) < (1, 7, 1):
       result = cast[T](r.next shr (sizeof(uint64) - sizeof(T))*8)
 
 when not defined(fuzzerStandalone):
-  proc mutate(data: ptr UncheckedArray[byte], len, maxLen: int): int {.
+  proc mutate*(data: ptr UncheckedArray[byte], len, maxLen: int): int {.
       importc: "LLVMFuzzerMutate".}
 
 template `+!`(p: pointer, s: int): untyped =
@@ -173,7 +173,7 @@ proc mutateArray*[S, T](value: array[S, T]; r: var Rand): array[S, T] {.inline.}
 
 template repeatMutate*(call: untyped) =
   if not enforceChanges and rand(r, RandomToDefaultRatio - 1) == 0:
-    discard
+    reset(value)
   else:
     var tmp = value
     for i in 1..10:
@@ -182,7 +182,7 @@ template repeatMutate*(call: untyped) =
 
 template repeatMutateInplace*(call: untyped) =
   if not enforceChanges and rand(r, RandomToDefaultRatio - 1) == 0:
-    discard
+    reset(value)
   else:
     var tmp {.inject.} = value
     for i in 1..10: