fix #15405. deepcopy arc (#15410)

* fix #15405
* fix tests
* deepcopy for ARC has to be enabled via --deepcopy:on

Co-authored-by: Araq <rumpf_a@web.de>

compiler/ccgexprs.nim

@@ -2394,6 +2394,10 @@ proc genMagicExpr(p: BProc, e: PNode, d: var TLoc, op: TMagic) =
       let n = semparallel.liftParallel(p.module.g.graph, p.module.module, e)
       expr(p, n, d)
   of mDeepCopy:
+    if p.config.selectedGC in {gcArc, gcOrc} and optEnableDeepCopy notin p.config.globalOptions:
+      localError(p.config, e.info,
+        "for --gc:arc|orc 'deepcopy' support has to be enabled with --deepcopy:on")
+
     var a, b: TLoc
     let x = if e[1].kind in {nkAddr, nkHiddenAddr}: e[1][0] else: e[1]
     initLocExpr(p, x, a)

compiler/ccgtypes.nim

@@ -1355,6 +1355,9 @@ proc genTypeInfoV2Impl(m: BModule, t, origType: PType, name: Rope; info: TLineIn
     name, destroyImpl, getTypeDesc(m, t), typeName,
     traceImpl, disposeImpl])
 
+  if t.kind == tyObject and t.len > 0 and t[0] != nil and optEnableDeepCopy in m.config.globalOptions:
+    discard genTypeInfoV1(m, t, info)
+
 proc genTypeInfoV2(m: BModule, t: PType; info: TLineInfo): Rope =
   let origType = t
   var t = skipTypes(origType, irrelevantForBackend + tyUserTypeClasses)
@@ -1454,12 +1457,12 @@ proc genTypeInfoV1(m: BModule, t: PType; info: TLineInfo): Rope =
       genTupleInfo(m, x, x, result, info)
   of tySequence:
     genTypeInfoAux(m, t, t, result, info)
-    if m.config.selectedGC >= gcMarkAndSweep:
+    if m.config.selectedGC in {gcMarkAndSweep, gcRefc, gcV2, gcGo}:
       let markerProc = genTraverseProc(m, origType, sig)
       m.s[cfsTypeInit3].addf("$1.marker = $2;$n", [tiNameForHcr(m, result), markerProc])
   of tyRef:
     genTypeInfoAux(m, t, t, result, info)
-    if m.config.selectedGC >= gcMarkAndSweep:
+    if m.config.selectedGC in {gcMarkAndSweep, gcRefc, gcV2, gcGo}:
       let markerProc = genTraverseProc(m, origType, sig)
       m.s[cfsTypeInit3].addf("$1.marker = $2;$n", [tiNameForHcr(m, result), markerProc])
   of tyPtr, tyRange, tyUncheckedArray: genTypeInfoAux(m, t, t, result, info)

compiler/commands.nim

@@ -901,7 +901,8 @@ proc processSwitch*(switch, arg: string, pass: TCmdLinePass, info: TLineInfo;
   of "sourcemap":
     conf.globalOptions.incl optSourcemap
     conf.options.incl optLineDir
-    # processOnOffSwitchG(conf, {optSourcemap, opt}, arg, pass, info)
+  of "deepcopy":
+    processOnOffSwitchG(conf, {optEnableDeepCopy}, arg, pass, info)
   of "": # comes from "-" in for example: `nim c -r -` (gets stripped from -)
     handleStdinInput(conf)
   else:

compiler/options.nim

@@ -96,6 +96,7 @@ type                          # please make sure we have under 32 options
     optNimV1Emulation         # emulate Nim v1.0
     optSourcemap
     optProfileVM              # enable VM profiler
+    optEnableDeepCopy         # ORC specific: enable 'deepcopy' for all types.
 
   TGlobalOptions* = set[TGlobalOption]