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Semfold for nil cast (#16030)

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* bring back the semfold of nil

* remove space

* fix test

* proc type can't be dereferenced
This commit is contained in:
cooldome 2020-11-18 17:19:57 +00:00 • committed by GitHub
commit 87d3e5331a
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3 changed files with 8 additions and 5 deletions
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4
compiler/ccgexprs.nim
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@ -71,8 +71,10 @@ proc genLiteral(p: BProc, n: PNode, ty: PType): Rope =
p.module.s[cfsData].addf( p.module.s[cfsData].addf(
"static NIM_CONST $1 $2 = {NIM_NIL,NIM_NIL};$n", "static NIM_CONST $1 $2 = {NIM_NIL,NIM_NIL};$n",
[getTypeDesc(p.module, ty), result]) [getTypeDesc(p.module, ty), result])
else: elif k in {tyPointer, tyNil, tyProc}:
result = rope("NIM_NIL") result = rope("NIM_NIL")
else:
result = "(($1) NIM_NIL)" % [getTypeDesc(p.module, ty)]
of nkStrLit..nkTripleStrLit: of nkStrLit..nkTripleStrLit:
let k = if ty == nil: tyString let k = if ty == nil: tyString
else: skipTypes(ty, abstractVarRange + {tyStatic, tyUserTypeClass, tyUserTypeClassInst}).kind else: skipTypes(ty, abstractVarRange + {tyStatic, tyUserTypeClass, tyUserTypeClassInst}).kind

2
compiler/semfold.nim
View file

@ -674,7 +674,7 @@ proc getConstExpr(m: PSym, n: PNode; idgen: IdGenerator; g: ModuleGraph): PNode
of nkCast: of nkCast:
var a = getConstExpr(m, n[1], idgen, g) var a = getConstExpr(m, n[1], idgen, g)
if a == nil: return if a == nil: return
if n.typ != nil and n.typ.kind in NilableTypes and a.kind != nkNilLit: if n.typ != nil and n.typ.kind in NilableTypes:
# we allow compile-time 'cast' for pointer types: # we allow compile-time 'cast' for pointer types:
result = a result = a
result.typ = n.typ result.typ = n.typ

7
tests/misc/tcast.nim
View file

@ -70,6 +70,7 @@ block:
static: static:
doAssert cast[RootRef](nil).repr == "nil" doAssert cast[RootRef](nil).repr == "nil"
block: # Issue #15730, not fixed yet
static: # block:
doAssert cast[cstring](nil).repr == "nil" # static:
# doAssert cast[cstring](nil).repr == "nil"