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fixes #25251; SIGBUS with iterator over const Table lookup - premature temporary destruction (#25255)

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fixes #25251

enforce a copy if the arg is a deref of a lent pointer since the arg
could be a temporary that will go out of scope

(cherry picked from commit 6f73094263)
This commit is contained in:
ringabout
2025-11-07 17:06:05 +08:00
committed by narimiran
parent 40e1a34831
commit 4efece995e
2 changed files with 29 additions and 1 deletions
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5
compiler/transf.nim
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@@ -828,8 +828,11 @@ proc transformFor(c: PTransf, n: PNode): PNode =
elif t.destructor == nil and arg.typ.destructor != nil:
t = arg.typ
if arg.kind in {nkDerefExpr, nkHiddenDeref}:
if arg.kind in {nkDerefExpr, nkHiddenDeref} and
arg[0].typ.skipTypes(abstractInst).kind != tyLent:
# optimizes for `[]` # bug #24093
# bug #25251: enforce a copy if the arg is a deref of a lent pointer
# since the arg could be a temporary that will go out of scope
var temp = newTemp(c, arg[0].typ, formal.info)
addVar(v, temp)
stmtList.add(newAsgnStmt(c, nkFastAsgn, temp, arg[0], true))