fixes #21393 and misc style changes (#21419)

* fixes #21393 and misc style changes

* progress

---------

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>

compiler/int128.nim

@@ -33,6 +33,7 @@ template high*(t: typedesc[Int128]): Int128 = Max
 proc `$`*(a: Int128): string
 
 proc toInt128*[T: SomeInteger | bool](arg: T): Int128 =
+  {.noSideEffect.}:
     when T is bool: result.sdata(0) = int32(arg)
     elif T is SomeUnsignedInt:
       when sizeof(arg) <= 4:

compiler/sempass2.nim

@@ -822,9 +822,6 @@ proc checkForSink(tracked: PEffects; n: PNode) =
   if tracked.inIfStmt == 0 and optSinkInference in tracked.config.options:
     checkForSink(tracked.config, tracked.c.idgen, tracked.owner, n)
 
-proc strictFuncsActive(tracked: PEffects): bool {.inline.} =
-  sfNoSideEffect in tracked.owner.flags and strictFuncs in tracked.c.features and not tracked.inEnforcedNoSideEffects
-
 proc trackCall(tracked: PEffects; n: PNode) =
   template gcsafeAndSideeffectCheck() =
     if notGcSafe(op) and not importedFromC(a):
@@ -934,7 +931,9 @@ proc trackCall(tracked: PEffects; n: PNode) =
           # initialized until after the call. Since we do this after we analysed the
           # call, this is fine.
           initVar(tracked, n[i].skipAddr, false)
-        if tracked.strictFuncsActive and isDangerousLocation(n[i].skipAddr, tracked.owner):
+        if strictFuncs in tracked.c.features and not tracked.inEnforcedNoSideEffects and
+           isDangerousLocation(n[i].skipAddr, tracked.owner):
+          if sfNoSideEffect in tracked.owner.flags:
             localError(tracked.config, n[i].info,
               "cannot pass $1 to `var T` parameter within a strict func" % renderTree(n[i]))
           tracked.hasSideEffect = true
@@ -1090,8 +1089,10 @@ proc track(tracked: PEffects, n: PNode) =
       createTypeBoundOps(tracked, n[0].typ, n.info)
     if n[0].kind != nkSym or not isLocalSym(tracked, n[0].sym):
       checkForSink(tracked, n[1])
-      if tracked.strictFuncsActive and isDangerousLocation(n[0], tracked.owner):
+      if strictFuncs in tracked.c.features and not tracked.inEnforcedNoSideEffects and
+         isDangerousLocation(n[0], tracked.owner):
         tracked.hasSideEffect = true
+        if sfNoSideEffect in tracked.owner.flags:
           localError(tracked.config, n[0].info,
               "cannot mutate location $1 within a strict func" % renderTree(n[0]))
   of nkVarSection, nkLetSection:

lib/pure/collections/tables.nim

@@ -447,7 +447,7 @@ proc mgetOrPut*[A, B](t: var Table[A, B], key: A, val: B): var B =
   ##
   ##
   ## Note that while the value returned is of type `var B`,
-  ## it is easy to accidentally create an copy of the value at `t[key]`.
+  ## it is easy to accidentally create a copy of the value at `t[key]`.
   ## Remember that seqs and strings are value types, and therefore
   ## cannot be copied into a separate variable for modification.
   ## See the example below.
@@ -828,6 +828,7 @@ proc newTable*[A, B](initialSize = defaultInitialSize): TableRef[A, B] =
       b = newTable[char, seq[int]]()
 
   new(result)
+  {.noSideEffect.}:
     result[] = initTable[A, B](initialSize)
 
 proc newTable*[A, B](pairs: openArray[(A, B)]): TableRef[A, B] =
@@ -844,12 +845,14 @@ proc newTable*[A, B](pairs: openArray[(A, B)]): TableRef[A, B] =
     assert b == {'a': 5, 'b': 9}.newTable
 
   new(result)
+  {.noSideEffect.}:
     result[] = toTable[A, B](pairs)
 
 proc newTableFrom*[A, B, C](collection: A, index: proc(x: B): C): TableRef[C, B] =
   ## Index the collection with the proc provided.
   # TODO: As soon as supported, change collection: A to collection: A[B]
   result = newTable[C, B]()
+  {.noSideEffect.}:
     for item in collection:
       result[index(item)] = item
 
@@ -1825,6 +1828,7 @@ proc newOrderedTable*[A, B](initialSize = defaultInitialSize): OrderedTableRef[A
       a = newOrderedTable[int, string]()
       b = newOrderedTable[char, seq[int]]()
   new(result)
+  {.noSideEffect.}:
     result[] = initOrderedTable[A, B](initialSize)
 
 proc newOrderedTable*[A, B](pairs: openArray[(A, B)]): OrderedTableRef[A, B] =
@@ -1842,6 +1846,7 @@ proc newOrderedTable*[A, B](pairs: openArray[(A, B)]): OrderedTableRef[A, B] =
     assert b == {'a': 5, 'b': 9}.newOrderedTable
 
   result = newOrderedTable[A, B](pairs.len)
+  {.noSideEffect.}:
     for key, val in items(pairs): result[key] = val
 
 
@@ -2641,12 +2646,14 @@ proc newCountTable*[A](initialSize = defaultInitialSize): CountTableRef[A] =
   ## * `initCountTable proc<#initCountTable>`_ for creating a
   ##   `CountTable`
   new(result)
+  {.noSideEffect.}:
     result[] = initCountTable[A](initialSize)
 
 proc newCountTable*[A](keys: openArray[A]): CountTableRef[A] =
   ## Creates a new ref count table with every member of a container `keys`
   ## having a count of how many times it occurs in that container.
   result = newCountTable[A](keys.len)
+  {.noSideEffect.}:
     for key in items(keys): result.inc(key)
 
 proc `[]`*[A](t: CountTableRef[A], key: A): int =
@@ -2671,6 +2678,7 @@ proc `[]=`*[A](t: CountTableRef[A], key: A, val: int) =
   ## * `inc proc<#inc,CountTableRef[A],A,int>`_ for incrementing a
   ##   value of a key
   assert val > 0
+  {.noSideEffect.}:
     t[][key] = val
 
 proc inc*[A](t: CountTableRef[A], key: A, val = 1) =
@@ -2680,6 +2688,7 @@ proc inc*[A](t: CountTableRef[A], key: A, val = 1) =
     a.inc('a')
     a.inc('b', 10)
     doAssert a == newCountTable("aaabbbbbbbbbbb")
+  {.noSideEffect.}:
     t[].inc(key, val)
 
 proc smallest*[A](t: CountTableRef[A]): tuple[key: A, val: int] =

lib/pure/hashes.nim

@@ -536,6 +536,7 @@ proc hash*[T: tuple | object | proc](x: T): Hash =
   elif T is (proc):
     result = hash(pointer(x))
   else:
+    result = 0
     for f in fields(x):
       result = result !& hash(f)
     result = !$result
@@ -551,6 +552,7 @@ proc hash*[A](x: openArray[A]): Hash =
     else:
       result = murmurHash(toOpenArrayByte(x, 0, x.high))
   else:
+    result = 0
     for a in x:
       result = result !& hash(a)
     result = !$result
@@ -583,6 +585,7 @@ proc hash*[A](aBuf: openArray[A], sPos, ePos: int): Hash =
 proc hash*[A](x: set[A]): Hash =
   ## Efficient hashing of sets.
   ## There must be a `hash` proc defined for the element type `A`.
+  result = 0
   for it in items(x):
     result = result !& hash(it)
   result = !$result

lib/pure/osproc.nim

@@ -570,12 +570,8 @@ when defined(windows) and not defined(useNimRtl):
     if a == 0: raiseOSError(osLastError())
 
   proc newFileHandleStream(handle: Handle): owned FileHandleStream =
-    new(result)
+    result = FileHandleStream(handle: handle, closeImpl: hsClose, atEndImpl: hsAtEnd,
-    result.handle = handle
+      readDataImpl: hsReadData, writeDataImpl: hsWriteData)
-    result.closeImpl = hsClose
-    result.atEndImpl = hsAtEnd
-    result.readDataImpl = hsReadData
-    result.writeDataImpl = hsWriteData
 
   proc buildCommandLine(a: string, args: openArray[string]): string =
     result = quoteShell(a)

lib/std/private/digitsutils.nim

@@ -101,9 +101,7 @@ proc addInt*(result: var string; x: int64) {.enforceNoRaises.} =
         num = cast[uint64](x)
       else:
         num = uint64(-x)
-      let base = result.len
+      result.add '-'
-      setLen(result, base + 1)
-      result[base] = '-'
     else:
       num = uint64(x)
     addInt(result, num)

lib/std/private/ospaths2.nim

@@ -571,7 +571,7 @@ proc normExt(ext: string): string =
 
 proc searchExtPos*(path: string): int =
   ## Returns index of the `'.'` char in `path` if it signifies the beginning
-  ## of extension. Returns -1 otherwise.
+  ## of the file extension. Returns -1 otherwise.
   ##
   ## See also:
   ## * `splitFile proc`_

lib/system/seqs_v2.nim

@@ -83,6 +83,7 @@ proc shrink*[T](x: var seq[T]; newLen: Natural) {.tags: [], raises: [].} =
       for i in countdown(x.len - 1, newLen):
         reset x[i]
     # XXX This is wrong for const seqs that were moved into 'x'!
+    {.noSideEffect.}:
       cast[ptr NimSeqV2[T]](addr x).len = newLen
 
 proc grow*[T](x: var seq[T]; newLen: Natural; value: T) =

lib/system/strmantle.nim

@@ -33,7 +33,7 @@ proc eqStrings(a, b: string): bool {.inline, compilerproc.} =
 proc hashString(s: string): int {.compilerproc.} =
   # the compiler needs exactly the same hash function!
   # this used to be used for efficient generation of string case statements
-  var h : uint = 0
+  var h = 0'u
   for i in 0..len(s)-1:
     h = h + uint(s[i])
     h = h + h shl 10

lib/windows/winlean.nim

@@ -48,12 +48,12 @@ type
   HGLRC* = Handle
   BYTE* = uint8
 
-  SECURITY_ATTRIBUTES* {.final, pure.} = object
+  SECURITY_ATTRIBUTES* = object
     nLength*: int32
     lpSecurityDescriptor*: pointer
     bInheritHandle*: WINBOOL
 
-  STARTUPINFO* {.final, pure.} = object
+  STARTUPINFO* = object
     cb*: int32
     lpReserved*: cstring
     lpDesktop*: cstring
@@ -73,17 +73,17 @@ type
     hStdOutput*: Handle
     hStdError*: Handle
 
-  PROCESS_INFORMATION* {.final, pure.} = object
+  PROCESS_INFORMATION* = object
     hProcess*: Handle
     hThread*: Handle
     dwProcessId*: int32
     dwThreadId*: int32
 
-  FILETIME* {.final, pure.} = object ## CANNOT BE int64 BECAUSE OF ALIGNMENT
+  FILETIME* = object ## CANNOT BE int64 BECAUSE OF ALIGNMENT
     dwLowDateTime*: DWORD
     dwHighDateTime*: DWORD
 
-  BY_HANDLE_FILE_INFORMATION* {.final, pure.} = object
+  BY_HANDLE_FILE_INFORMATION* = object
     dwFileAttributes*: DWORD
     ftCreationTime*: FILETIME
     ftLastAccessTime*: FILETIME
@@ -95,7 +95,7 @@ type
     nFileIndexHigh*: DWORD
     nFileIndexLow*: DWORD
 
-  OSVERSIONINFO* {.final, pure.} = object
+  OSVERSIONINFO* = object
     dwOSVersionInfoSize*: DWORD
     dwMajorVersion*: DWORD
     dwMinorVersion*: DWORD
@@ -820,7 +820,7 @@ type
   POVERLAPPED_COMPLETION_ROUTINE* = proc (para1: DWORD, para2: DWORD,
       para3: POVERLAPPED){.stdcall.}
 
-  GUID* {.final, pure.} = object
+  GUID* = object
     D1*: int32
     D2*: int16
     D3*: int16
@@ -1101,7 +1101,7 @@ proc wsaResetEvent*(hEvent: Handle): bool
      {.stdcall, importc: "WSAResetEvent", dynlib: "ws2_32.dll".}
 
 type
-  KEY_EVENT_RECORD* {.final, pure.} = object
+  KEY_EVENT_RECORD* = object
     eventType*: int16
     bKeyDown*: WINBOOL
     wRepeatCount*: int16

tests/effects/tstrictfuncs_misc.nim

@@ -53,7 +53,7 @@ type
   JsonNode3 = ref object
     fields: MyTable
 
-proc `[]`(t: var MyTable, key: string): var int =
+proc `[]`(t: MyTable, key: string): int =
   result = t.data[0]
 
 proc `[]`(x: JsonNode3, key: string): int =