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
203 lines
7.3 KiB
C++
203 lines
7.3 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 "kernel/expr.h"
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#include "library/expr_lt.h"
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namespace lean {
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bool is_lt(expr const & a, expr const & b, bool use_hash, local_context const * lctx) {
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if (is_eqp(a, b)) return false;
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if (a.kind() != b.kind()) return a.kind() < b.kind();
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if (use_hash) {
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if (hash(a) < hash(b)) return true;
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if (hash(a) > hash(b)) return false;
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}
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if (a == b) return false;
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switch (a.kind()) {
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case expr_kind::Lit:
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return lit_value(a) < lit_value(b);
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case expr_kind::BVar:
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return bvar_idx(a) < bvar_idx(b);
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case expr_kind::MData:
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if (mdata_expr(a) != mdata_expr(b))
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return is_lt(mdata_expr(a), mdata_expr(b), use_hash, lctx);
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else
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return mdata_data(a) < mdata_data(b);
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case expr_kind::Proj:
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if (proj_expr(a) != proj_expr(b))
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return is_lt(proj_expr(a), proj_expr(b), use_hash, lctx);
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else if (proj_sname(a) != proj_sname(b))
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return proj_sname(a) < proj_sname(b);
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else
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return proj_idx(a) < proj_idx(b);
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case expr_kind::Const:
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if (const_name(a) != const_name(b))
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return const_name(a) < const_name(b);
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else
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return is_lt(const_levels(a), const_levels(b), use_hash);
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case expr_kind::App:
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if (app_fn(a) != app_fn(b))
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return is_lt(app_fn(a), app_fn(b), use_hash, lctx);
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else
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return is_lt(app_arg(a), app_arg(b), use_hash, lctx);
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case expr_kind::Lambda: case expr_kind::Pi:
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if (binding_domain(a) != binding_domain(b))
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return is_lt(binding_domain(a), binding_domain(b), use_hash, lctx);
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else
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return is_lt(binding_body(a), binding_body(b), use_hash, lctx);
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case expr_kind::Let:
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if (let_type(a) != let_type(b))
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return is_lt(let_type(a), let_type(b), use_hash, lctx);
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else if (let_value(a) != let_value(b))
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return is_lt(let_value(a), let_value(b), use_hash, lctx);
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else
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return is_lt(let_body(a), let_body(b), use_hash, lctx);
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case expr_kind::Sort:
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return is_lt(sort_level(a), sort_level(b), use_hash);
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case expr_kind::FVar:
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if (lctx) {
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if (auto d1 = lctx->find_local_decl(a))
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if (auto d2 = lctx->find_local_decl(b))
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return d1->get_idx() < d2->get_idx();
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}
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return fvar_name(a) < fvar_name(b);
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case expr_kind::MVar:
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return mvar_name(a) < mvar_name(b);
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case expr_kind::Local:
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return local_name(a) < local_name(b);
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}
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lean_unreachable(); // LCOV_EXCL_LINE
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}
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bool is_lt_no_level_params(level const & a, level const & b) {
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if (is_eqp(a, b)) return false;
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if (kind(a) != kind(b)) {
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if (kind(a) == level_kind::Param || kind(b) == level_kind::Param)
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return false;
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return kind(a) < kind(b);
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}
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switch (kind(a)) {
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case level_kind::Zero:
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lean_unreachable(); // LCOV_EXCL_LINE
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case level_kind::Param:
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return false;
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case level_kind::MVar:
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return mvar_id(a) < mvar_id(b);
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case level_kind::Max:
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if (is_lt_no_level_params(max_lhs(a), max_lhs(b)))
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return true;
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else if (is_lt_no_level_params(max_lhs(b), max_lhs(a)))
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return false;
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else
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return is_lt_no_level_params(max_rhs(a), max_rhs(b));
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case level_kind::IMax:
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if (is_lt_no_level_params(imax_lhs(a), imax_lhs(b)))
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return true;
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else if (is_lt_no_level_params(imax_lhs(b), imax_lhs(a)))
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return false;
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else
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return is_lt_no_level_params(imax_rhs(a), imax_rhs(b));
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case level_kind::Succ:
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return is_lt_no_level_params(succ_of(a), succ_of(b));
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}
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lean_unreachable();
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}
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bool is_lt_no_level_params(levels const & as, levels const & bs) {
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if (is_nil(as))
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return !is_nil(bs);
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else if (is_nil(bs))
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return false;
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else if (is_lt_no_level_params(car(as), car(bs)))
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return true;
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else if (is_lt_no_level_params(car(bs), car(as)))
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return false;
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else
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return is_lt_no_level_params(cdr(as), cdr(bs));
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}
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bool is_lt_no_level_params(expr const & a, expr const & b) {
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if (is_eqp(a, b)) return false;
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if (a.kind() != b.kind()) return a.kind() < b.kind();
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switch (a.kind()) {
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case expr_kind::Lit:
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return lit_value(a) < lit_value(b);
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case expr_kind::BVar:
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return bvar_idx(a) < bvar_idx(b);
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case expr_kind::MData:
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if (mdata_expr(a) != mdata_expr(b))
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return is_lt_no_level_params(mdata_expr(a), mdata_expr(b));
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else
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return mdata_data(a) < mdata_data(b);
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case expr_kind::Proj:
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if (proj_expr(a) != proj_expr(b))
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return is_lt_no_level_params(proj_expr(a), proj_expr(b));
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else if (proj_sname(a) != proj_sname(b))
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return proj_sname(a) < proj_sname(b);
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else
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return proj_idx(a) < proj_idx(b);
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case expr_kind::Const:
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if (const_name(a) != const_name(b))
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return const_name(a) < const_name(b);
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else
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return is_lt_no_level_params(const_levels(a), const_levels(b));
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case expr_kind::App:
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if (is_lt_no_level_params(app_fn(a), app_fn(b)))
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return true;
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else if (is_lt_no_level_params(app_fn(b), app_fn(a)))
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return false;
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else
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return is_lt_no_level_params(app_arg(a), app_arg(b));
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case expr_kind::Lambda: case expr_kind::Pi:
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if (is_lt_no_level_params(binding_domain(a), binding_domain(b)))
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return true;
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else if (is_lt_no_level_params(binding_domain(b), binding_domain(a)))
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return false;
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else
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return is_lt_no_level_params(binding_body(a), binding_body(b));
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case expr_kind::Let:
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if (is_lt_no_level_params(let_type(a), let_type(b)))
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return true;
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else if (is_lt_no_level_params(let_type(b), let_type(a)))
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return false;
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else if (is_lt_no_level_params(let_value(a), let_value(b)))
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return true;
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else if (is_lt_no_level_params(let_value(b), let_value(a)))
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return false;
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else
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return is_lt_no_level_params(let_body(a), let_body(b));
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case expr_kind::Sort:
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return is_lt_no_level_params(sort_level(a), sort_level(b));
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case expr_kind::Local:
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if (local_name(a) != local_name(b))
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return local_name(a) < local_name(b);
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else
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return is_lt_no_level_params(local_type(a), local_type(b));
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case expr_kind::FVar:
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return fvar_name(a) < fvar_name(b);
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case expr_kind::MVar:
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return mvar_name(a) < mvar_name(b);
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}
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lean_unreachable();
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}
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int expr_cmp_no_level_params::operator()(expr const & e1, expr const & e2) const {
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if (is_lt_no_level_params(e1, e2))
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return -1;
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else if (is_lt_no_level_params(e2, e1))
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return 1;
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else
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return 0;
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}
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extern "C" uint8 lean_expr_quick_lt(b_obj_arg a, b_obj_arg b) {
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return is_lt(expr(a, true), expr(b, true), true, nullptr);
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}
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extern "C" uint8 lean_expr_lt(b_obj_arg a, b_obj_arg b) {
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return is_lt(expr(a, true), expr(b, true), false, nullptr);
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}
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}
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