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Never update values after setting the type

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Thunks are now overwritten by a helper function
`Value::finishValue(newType, payload)` (where `payload` is the
original anonymous union inside `Value`). This helps to ensure we
never update a value elsewhere, since that would be incompatible with
parallel evaluation (i.e. after a value has transitioned from being a
thunk to being a non-thunk, it should be immutable).

There were two places where this happened: `Value::mkString()` and
`ExprAttrs::eval()`.

This PR also adds a bunch of accessor functions for value contents,
like `Value::integer()` to access the integer field in the union.
This commit is contained in:
Eelco Dolstra 2024-03-25 18:20:18 +01:00
parent 6d90287f5a
commit 8c0590fa32
35 changed files with 530 additions and 556 deletions
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5
src/libexpr/eval.hh
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@ -86,7 +86,7 @@ struct PrimOp
void check();
};
std::ostream & operator<<(std::ostream & output, PrimOp & primOp);
std::ostream & operator<<(std::ostream & output, const PrimOp & primOp);
/**
* Info about a constant
@ -635,9 +635,6 @@ public:
inline Value * allocValue();
inline Env & allocEnv(size_t size);
Value * allocAttr(Value & vAttrs, Symbol name);
Value * allocAttr(Value & vAttrs, std::string_view name);
Bindings * allocBindings(size_t capacity);
BindingsBuilder buildBindings(size_t capacity)