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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/value-to-xml.cc
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@ -42,7 +42,7 @@ static void showAttrs(EvalState & state, bool strict, bool location,
XMLAttrs xmlAttrs;
xmlAttrs["name"] = i;
if (location && a.pos != &noPos) posToXML(xmlAttrs, *a.pos);
if (location && a.pos != ptr(&noPos)) posToXML(xmlAttrs, *a.pos);
XMLOpenElement _(doc, "attr", xmlAttrs);
printValueAsXML(state, strict, location,