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fixes #17173 (#17213)

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* fixes #17173

* add testcase (#17214)

* Apply suggestions from code review

* fix for newruntime

* Apply suggestions from code review

* Update lib/system.nim

* Update lib/system.nim

* Update lib/system.nim

Co-authored-by: Danil Yarantsev <tiberiumk12@gmail.com>

Co-authored-by: flywind <xzsflywind@gmail.com>
Co-authored-by: Danil Yarantsev <tiberiumk12@gmail.com>
This commit is contained in:
Andreas Rumpf
2021-03-01 20:58:12 +01:00
committed by GitHub
parent c625ce80cb
commit bb0c19f42c
5 changed files with 33 additions and 2 deletions
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7
lib/system/strs_v2.nim
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@@ -168,3 +168,10 @@ proc nimPrepareStrMutationImpl(s: var NimStringV2) =
proc nimPrepareStrMutationV2(s: var NimStringV2) {.compilerRtl, inline.} =
if s.p != nil and (s.p.cap and strlitFlag) == strlitFlag:
nimPrepareStrMutationImpl(s)
proc prepareStrMutation*(s: var string) {.inline.} =
# string literals are "copy on write", so you need to call
# `prepareStrMutation` before modifying the strings.
{.cast(noSideEffect).}:
let s = unsafeAddr s
nimPrepareStrMutationV2(cast[ptr NimStringV2](s)[])