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Force all Pos* to be non-null

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This fixes a class of crashes and introduces ptr<T> to make the
code robust against this failure mode going forward.

Thanks regnat for the idea of a ref<T> without overhead!

Closes #4895
Closes #4893
Closes #5127
Closes #5113
This commit is contained in:
Robert Hensing 2021-08-29 18:09:13 +02:00
parent af94b54db3
commit f10465774f
7 changed files with 65 additions and 22 deletions
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2
src/libexpr/eval.hh
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@ -308,7 +308,7 @@ public:
void mkList(Value & v, size_t length);
void mkAttrs(Value & v, size_t capacity);
void mkThunk_(Value & v, Expr * expr);
void mkPos(Value & v, Pos * pos);
void mkPos(Value & v, ptr<Pos> pos);
void concatLists(Value & v, size_t nrLists, Value * * lists, const Pos & pos);