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Fix array's high & low return type for empty arrays (#17705)

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* fix array.high/low return type

* Add test for empty array low return type

Co-authored-by: konsumlamm <44230978+konsumlamm@users.noreply.github.com>

Co-authored-by: konsumlamm <44230978+konsumlamm@users.noreply.github.com>
This commit is contained in:
Tanguy Cizain
2021-04-15 15:45:38 +02:00
committed by GitHub
parent 51a40c1f38
commit 363467fc00
3 changed files with 17 additions and 0 deletions
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2
compiler/semexprs.nim
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@@ -379,6 +379,8 @@ proc semLowHigh(c: PContext, n: PNode, m: TMagic): PNode =
n.typ = getSysType(c.graph, n.info, tyInt)
of tyArray:
n.typ = typ[0] # indextype
if n.typ.kind == tyRange and emptyRange(n.typ.n[0], n.typ.n[1]): #Invalid range
n.typ = getSysType(c.graph, n.info, tyInt)
of tyInt..tyInt64, tyChar, tyBool, tyEnum, tyUInt..tyUInt64, tyFloat..tyFloat64:
n.typ = n[1].typ.skipTypes({tyTypeDesc})
of tyGenericParam:

8
lib/system.nim
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@@ -348,6 +348,8 @@ proc high*[T](x: openArray[T]): int {.magic: "High", noSideEffect.}
proc high*[I, T](x: array[I, T]): I {.magic: "High", noSideEffect.}
## Returns the highest possible index of an array `x`.
##
## For empty arrays, the return type is `int`.
##
## See also:
## * `low(array) <#low,array[I,T]>`_
##
@@ -360,6 +362,8 @@ proc high*[I, T](x: array[I, T]): I {.magic: "High", noSideEffect.}
proc high*[I, T](x: typedesc[array[I, T]]): I {.magic: "High", noSideEffect.}
## Returns the highest possible index of an array type.
##
## For empty arrays, the return type is `int`.
##
## See also:
## * `low(typedesc[array]) <#low,typedesc[array[I,T]]>`_
##
@@ -420,6 +424,8 @@ proc low*[T](x: openArray[T]): int {.magic: "Low", noSideEffect.}
proc low*[I, T](x: array[I, T]): I {.magic: "Low", noSideEffect.}
## Returns the lowest possible index of an array `x`.
##
## For empty arrays, the return type is `int`.
##
## See also:
## * `high(array) <#high,array[I,T]>`_
##
@@ -432,6 +438,8 @@ proc low*[I, T](x: array[I, T]): I {.magic: "Low", noSideEffect.}
proc low*[I, T](x: typedesc[array[I, T]]): I {.magic: "Low", noSideEffect.}
## Returns the lowest possible index of an array type.
##
## For empty arrays, the return type is `int`.
##
## See also:
## * `high(typedesc[array]) <#high,typedesc[array[I,T]]>`_
##

7
tests/array/tarray.nim
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@@ -587,3 +587,10 @@ block t12466:
a[0'u16 + i] = i
for i in 0'u16 ..< 8'u16:
a[0'u16 + i] = i
block t17705:
# https://github.com/nim-lang/Nim/pull/17705
var a = array[0, int].low
a = int(a)
var b = array[0, int].high
b = int(b)