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fixes the discVal register is used after free in vmgen (#22688)

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follow up https://github.com/nim-lang/Nim/pull/11955
This commit is contained in:
ringabout
2023-09-11 16:54:41 +08:00
committed by GitHub
parent fbb5ac512c
commit b1a8d6976f
1 changed files with 1 additions and 1 deletions
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2
compiler/vmgen.nim
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@@ -1822,7 +1822,6 @@ proc genCheckedObjAccessAux(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags
let setLit = c.genx(checkExpr[1])
var rs = c.getTemp(getSysType(c.graph, n.info, tyBool))
c.gABC(n, opcContainsSet, rs, setLit, discVal)
c.freeTemp(discVal)
c.freeTemp(setLit)
# If the check fails let the user know
let lab1 = c.xjmp(n, if negCheck: opcFJmp else: opcTJmp, rs)
@@ -1835,6 +1834,7 @@ proc genCheckedObjAccessAux(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags
strLit.typ = strType
c.genLit(strLit, msgReg)
c.gABC(n, opcInvalidField, msgReg, discVal)
c.freeTemp(discVal)
c.freeTemp(msgReg)
c.patch(lab1)