85092412c7
@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
39 lines
1.6 KiB
C++
39 lines
1.6 KiB
C++
/*
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Copyright (c) 2013 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#include "util/buffer.h"
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#include "kernel/expr.h"
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#include "kernel/replace_fn.h"
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namespace lean {
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expr copy(expr const & a) {
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switch (a.kind()) {
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case expr_kind::Lit: return mk_lit(lit_value(a));
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case expr_kind::MData: return mk_mdata(mdata_data(a), mdata_expr(a));
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case expr_kind::Proj: return mk_proj(proj_sname(a), proj_idx(a), proj_expr(a));
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case expr_kind::BVar: return mk_bvar(bvar_idx(a));
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case expr_kind::FVar: return mk_fvar(fvar_name(a));
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case expr_kind::Const: return mk_const(const_name(a), const_levels(a));
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case expr_kind::Sort: return mk_sort(sort_level(a));
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case expr_kind::App: return mk_app(app_fn(a), app_arg(a));
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case expr_kind::Lambda: return mk_lambda(binding_name(a), binding_domain(a), binding_body(a), binding_info(a));
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case expr_kind::Pi: return mk_pi(binding_name(a), binding_domain(a), binding_body(a), binding_info(a));
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case expr_kind::MVar: return mk_mvar(mvar_name(a));
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case expr_kind::Let: return mk_let(let_name(a), let_type(a), let_value(a), let_body(a));
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case expr_kind::Local: return mk_local(local_name(a), local_pp_name(a), local_type(a), local_info(a));
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}
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lean_unreachable(); // LCOV_EXCL_LINE
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}
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expr deep_copy(expr const & e) {
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return replace(e, [](expr const & e) {
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if (is_atomic(e))
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return some_expr(copy(e));
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else
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return none_expr();
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});
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}
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}
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