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// Copyright (C) 2020 Free Software Foundation, Inc.
// This file is part of GCC.
// GCC is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3, or (at your option) any later
// version.
// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
// You should have received a copy of the GNU General Public License
// along with GCC; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#include "rust-linemap.h"
#include "rust-backend.h"
#include "rust-compile-resolve-path.h"
#include "rust-compile-item.h"
#include "rust-hir-trait-resolve.h"
#include "rust-hir-path-probe.h"
namespace Rust {
namespace Compile {
void
ResolvePathRef::visit (HIR::PathInExpression &expr)
{
// need to look up the reference for this identifier
NodeId ref_node_id = UNKNOWN_NODEID;
if (ctx->get_resolver ()->lookup_resolved_name (
expr.get_mappings ().get_nodeid (), &ref_node_id))
{
Resolver::Definition def;
if (!ctx->get_resolver ()->lookup_definition (ref_node_id, &def))
{
rust_error_at (expr.get_locus (),
"unknown reference for resolved name");
return;
}
ref_node_id = def.parent;
}
// this can fail because it might be a Constructor for something
// in that case the caller should attempt ResolvePathType::Compile
if (ref_node_id == UNKNOWN_NODEID)
return;
HirId ref;
if (!ctx->get_mappings ()->lookup_node_to_hir (
expr.get_mappings ().get_crate_num (), ref_node_id, &ref))
{
rust_error_at (expr.get_locus (), "reverse call path lookup failure");
return;
}
// might be a constant
if (ctx->lookup_const_decl (ref, &resolved))
return;
// this might be a variable reference or a function reference
Bvariable *var = nullptr;
if (ctx->lookup_var_decl (ref, &var))
{
resolved = ctx->get_backend ()->var_expression (var, expr.get_locus ());
return;
}
// must be a function call but it might be a generic function which needs to
// be compiled first
TyTy::BaseType *lookup = nullptr;
bool ok = ctx->get_tyctx ()->lookup_type (expr.get_mappings ().get_hirid (),
&lookup);
rust_assert (ok);
rust_assert (lookup->get_kind () == TyTy::TypeKind::FNDEF);
Bfunction *fn = nullptr;
if (!ctx->lookup_function_decl (lookup->get_ty_ref (), &fn))
{
// it must resolve to some kind of HIR::Item or HIR::InheritImplItem
HIR::Item *resolved_item = ctx->get_mappings ()->lookup_hir_item (
expr.get_mappings ().get_crate_num (), ref);
if (resolved_item != nullptr)
{
if (!lookup->has_subsititions_defined ())
CompileItem::compile (resolved_item, ctx);
else
CompileItem::compile (resolved_item, ctx, true, lookup);
}
else
{
HirId parent_impl_id = UNKNOWN_HIRID;
HIR::ImplItem *resolved_item
= ctx->get_mappings ()->lookup_hir_implitem (
expr.get_mappings ().get_crate_num (), ref, &parent_impl_id);
if (resolved_item == nullptr)
{
// it might be resolved to a trait item
HIR::TraitItem *trait_item
= ctx->get_mappings ()->lookup_hir_trait_item (
expr.get_mappings ().get_crate_num (), ref);
HIR::Trait *trait
= ctx->get_mappings ()->lookup_trait_item_mapping (
trait_item->get_mappings ().get_hirid ());
Resolver::TraitReference *trait_ref
= &Resolver::TraitReference::error_node ();
bool ok = ctx->get_tyctx ()->lookup_trait_reference (
trait->get_mappings ().get_defid (), &trait_ref);
rust_assert (ok);
TyTy::BaseType *receiver = nullptr;
ok = ctx->get_tyctx ()->lookup_receiver (
expr.get_mappings ().get_hirid (), &receiver);
rust_assert (ok);
if (receiver->get_kind () == TyTy::TypeKind::PARAM)
{
TyTy::ParamType *p
= static_cast<TyTy::ParamType *> (receiver);
receiver = p->resolve ();
}
// the type resolver can only resolve type bounds to their trait
// item so its up to us to figure out if this path should resolve
// to an trait-impl-block-item or if it can be defaulted to the
// trait-impl-item's definition
std::vector<Resolver::PathProbeCandidate> candidates
= Resolver::PathProbeType::Probe (
receiver, expr.get_final_segment ().get_segment (), true,
false, true);
if (candidates.size () == 0)
{
// this means we are defaulting back to the trait_item if
// possible
// TODO
gcc_unreachable ();
}
else
{
Resolver::PathProbeCandidate &candidate = candidates.at (0);
rust_assert (candidate.is_impl_candidate ());
HIR::ImplBlock *impl = candidate.item.impl.parent;
HIR::ImplItem *impl_item = candidate.item.impl.impl_item;
TyTy::BaseType *self = nullptr;
bool ok = ctx->get_tyctx ()->lookup_type (
impl->get_type ()->get_mappings ().get_hirid (), &self);
rust_assert (ok);
if (!lookup->has_subsititions_defined ())
CompileInherentImplItem::Compile (self, impl_item, ctx,
true);
else
CompileInherentImplItem::Compile (self, impl_item, ctx,
true, lookup);
lookup->set_ty_ref (
impl_item->get_impl_mappings ().get_hirid ());
}
}
else
{
rust_assert (parent_impl_id != UNKNOWN_HIRID);
HIR::Item *impl_ref = ctx->get_mappings ()->lookup_hir_item (
expr.get_mappings ().get_crate_num (), parent_impl_id);
rust_assert (impl_ref != nullptr);
HIR::ImplBlock *impl = static_cast<HIR::ImplBlock *> (impl_ref);
TyTy::BaseType *self = nullptr;
bool ok = ctx->get_tyctx ()->lookup_type (
impl->get_type ()->get_mappings ().get_hirid (), &self);
rust_assert (ok);
if (!lookup->has_subsititions_defined ())
CompileInherentImplItem::Compile (self, resolved_item, ctx,
true);
else
CompileInherentImplItem::Compile (self, resolved_item, ctx,
true, lookup);
}
}
if (!ctx->lookup_function_decl (lookup->get_ty_ref (), &fn))
{
resolved = ctx->get_backend ()->error_expression ();
rust_error_at (expr.get_locus (),
"forward declaration was not compiled");
return;
}
}
resolved
= ctx->get_backend ()->function_code_expression (fn, expr.get_locus ());
}
} // namespace Compile
} // namespace Rust
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