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Pass positions when evaluating

Browse source 
This includes position information in more places, making debugging
easier.

Before:

```
$ nix-instantiate --show-trace --eval tests/functional/lang/eval-fail-using-set-as-attr-name.nix
error:
       … while evaluating an attribute name

         at «none»:0: (source not available)

       error: value is a set while a string was expected
```

After:

```
error:
       … while evaluating an attribute name

         at /pwd/lang/eval-fail-using-set-as-attr-name.nix:5:10:

            4| in
            5|   attr.${key}
             |          ^
            6|

       error: value is a set while a string was expected
```
This commit is contained in:
Rebecca Turner 2023-12-07 10:01:42 -08:00
parent 3dcb83409d
commit 0b80935c22
No known key found for this signature in database
12 changed files with 137 additions and 14 deletions
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12
src/libexpr/eval-inline.hh
View file

@ -103,8 +103,10 @@ void EvalState::forceValue(Value & v, Callable getPos)
throw;
}
}
else if (v.isApp())
callFunction(*v.app.left, *v.app.right, v, noPos);
else if (v.isApp()) {
PosIdx pos = getPos();
callFunction(*v.app.left, *v.app.right, v, pos);
}
else if (v.isBlackhole())
error("infinite recursion encountered").atPos(getPos()).template debugThrow<EvalError>();
}
@ -121,9 +123,9 @@ template <typename Callable>
[[gnu::always_inline]]
inline void EvalState::forceAttrs(Value & v, Callable getPos, std::string_view errorCtx)
{
forceValue(v, noPos);
PosIdx pos = getPos();
forceValue(v, pos);
if (v.type() != nAttrs) {
PosIdx pos = getPos();
error("value is %1% while a set was expected", showType(v)).withTrace(pos, errorCtx).debugThrow<TypeError>();
}
}
@ -132,7 +134,7 @@ inline void EvalState::forceAttrs(Value & v, Callable getPos, std::string_view e
[[gnu::always_inline]]
inline void EvalState::forceList(Value & v, const PosIdx pos, std::string_view errorCtx)
{
forceValue(v, noPos);
forceValue(v, pos);
if (!v.isList()) {
error("value is %1% while a list was expected", showType(v)).withTrace(pos, errorCtx).debugThrow<TypeError>();
}