@Kha @dselsam:
This hack was preventing us from making `Expr` a "real" Lean type.
This was bad for a few reasons:
- It was hard to extend/modify `Expr` in Lean since we would also have
to modify the C++ code that creates the `Expr` objects with the hidden
fields.
- `Expr.lam` and `Expr.forallE` were not following the Lean layout
standard where we sort fields by size. @Kha: recall we used that to
avoid a UB. The issue with `Expr.lam` and `Expr.forallE` is that they
have a "visible" field (`BinderInfo`), which is smaller than
hidden fields such as hash code.
- `Expr.fvar` had only one field at `Expr.lean,` but four behind the
scenes.
I added a new constructor `Local` that is only accessible from C++.
It is only used in legacy code we inherited from Lean2.
We will eventually delete it.
This refactoring was quite painful since many parts of the codebase
were mixing the new `Expr.fvar` with the old `Expr.local`.
I doubt I would be able to do it without the new staging framework
@Kha built.
BTW, some of the patches are horrible. I didn't care much since we
are going to deleted the super ugly files. That being said,
you should expect new weird bevaior due to `Expr.fvar` vs `Expr.local`.
Next step: use the new `ExprCachedData` to make all `Expr` hidden visibles
accessible from Lean.
checkpoint
- Lean strings (like std::string) may contain null characters. The
codebase was ignoring this issue.
- We now have a wrapper `string_ref` for wrapping Lean string objects in
C++. This wrapper also implements correctly the coercions std::string <-> string_ref.
Remark: I also found a few places where the code relies on the
following property which is not true
Forall s : std::string, std::string(s.c_str()) == s
- `name` object wrapper was assuming that all numerals were small
`nat` values. This is true in most cases, but the system would
crash when processing if it is a big number.
- The commit tries to make sure runtime/util/kernel are correct.
Modules that will be deleted contain many `TODO` comments
indicating they may crash and/or produce incorrect results
when strings contain null characters and numerals are big.
cc @kha
@kha: I thought about using `string` instead of `string_ref`.
We consistently use `std::string`. So, it should be fine, but I
was concerned about code readability.
After we bootstrap Lean4, we will be able to delete `lean::list`
template, and rename `lean::list_ref` to `lean::list`.
I am going to add `pair_ref` for wrapping Lean pair objects.
If we use `lean::string` instead of `lean::string_ref`, then
we should also use `lean::pair` instead of `lean::pair_ref`.
But, there is a problem in this case since we have
https://github.com/leanprover/lean4/blob/master/src/util/pair.h#L13
:(
We replace them with a new kind of (delayed) assignment at `metavar_context`
```
mvar := (lctx, locals, v)
```
where `lctx` is a local context, `locals` is a list of local
constants, and `v` is an expression.
When all metavariables in `v` are assigned, this assignment is replaced with
```
mvar := Fun(locals, v)
```
