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Fix negative indexed arrays for JS, refs #13966 (#14152)

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* Fix negative arrays for JS, refs #13966

* small extra fix: no need to .slice() cstring in JS
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hlaaftana 2020-04-29 09:59:08 +03:00 • committed by GitHub
commit 800ce5b950
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2 changed files with 10 additions and 4 deletions
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8
compiler/jsgen.nim
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@ -1161,9 +1161,9 @@ proc genArrayAddr(p: PProc, n: PNode, r: var TCompRes) =
first = firstOrd(p.config, typ[0])
if optBoundsCheck in p.options:
useMagic(p, "chckIndx")
r.res = "chckIndx($1, $2, ($3 != null ? $3.length : 0)+$2-1)-$2" % [b.res, rope(first), tmp]
r.res = "chckIndx($1, $2, ($3 != null ? $3.length : 0)+$2-1)-($2)" % [b.res, rope(first), tmp]
elif first != 0:
r.res = "($1)-$2" % [b.res, rope(first)]
r.res = "($1)-($2)" % [b.res, rope(first)]
else:
r.res = b.res
r.kind = resExpr
@ -1897,8 +1897,8 @@ proc genMagic(p: PProc, n: PNode, r: var TCompRes) =
let rhsIsLit = n[2].kind in nkStrKinds
let (a, tmp) = maybeMakeTemp(p, n[1], lhs)
if skipTypes(n[1].typ, abstractVarRange).kind == tyCString:
r.res = "if ($1 != null) { $4 += $2; } else { $4 = $2$3; }" % [
a, rhs.rdLoc, if rhsIsLit: nil else: ~".slice()", tmp]
r.res = "if ($1 != null) { $3 += $2; } else { $3 = $2; }" % [
a, rhs.rdLoc, tmp]
else:
r.res = "if ($1 != null) { $4 = ($4).concat($2); } else { $4 = $2$3; }" % [
lhs.rdLoc, rhs.rdLoc, if rhsIsLit: nil else: ~".slice()", tmp]