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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::QualifiedPathInExpression &expr)
{
resolved = resolve (expr.get_final_segment ().get_segment (),
expr.get_mappings (), expr.get_locus (), true);
}
void
ResolvePathRef::visit (HIR::PathInExpression &expr)
{
resolved = resolve (expr.get_final_segment ().get_segment (),
expr.get_mappings (), expr.get_locus (), false);
}
Bexpression *
ResolvePathRef::resolve (const HIR::PathIdentSegment &final_segment,
const Analysis::NodeMapping &mappings,
Location expr_locus, bool is_qualified_path)
{
// need to look up the reference for this identifier
NodeId ref_node_id = UNKNOWN_NODEID;
if (ctx->get_resolver ()->lookup_resolved_name (mappings.get_nodeid (),
&ref_node_id))
{
Resolver::Definition def;
if (!ctx->get_resolver ()->lookup_definition (ref_node_id, &def))
{
rust_error_at (expr_locus, "unknown reference for resolved name");
return ctx->get_backend ()->error_expression ();
}
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)
{
rust_error_at (expr_locus, "unknown nodeid for path expr");
return ctx->get_backend ()->error_expression ();
}
HirId ref;
if (!ctx->get_mappings ()->lookup_node_to_hir (mappings.get_crate_num (),
ref_node_id, &ref))
{
rust_error_at (expr_locus, "reverse call path lookup failure");
return ctx->get_backend ()->error_expression ();
}
// might be a constant
Bexpression *constant_expr;
if (ctx->lookup_const_decl (ref, &constant_expr))
return constant_expr;
// this might be a variable reference or a function reference
Bvariable *var = nullptr;
if (ctx->lookup_var_decl (ref, &var))
return ctx->get_backend ()->var_expression (var, expr_locus);
// it might be a function call
TyTy::BaseType *lookup = nullptr;
bool ok = ctx->get_tyctx ()->lookup_type (mappings.get_hirid (), &lookup);
rust_assert (ok);
if (lookup->get_kind () == TyTy::TypeKind::FNDEF)
{
TyTy::FnType *fntype = static_cast<TyTy::FnType *> (lookup);
Bfunction *fn = nullptr;
if (ctx->lookup_function_decl (fntype->get_ty_ref (), &fn))
{
return ctx->get_backend ()->function_code_expression (fn, expr_locus);
}
}
// let the query system figure it out
return query_compile (ref, lookup, final_segment, mappings, expr_locus,
is_qualified_path);
}
Bexpression *
ResolvePathRef::query_compile (HirId ref, TyTy::BaseType *lookup,
const HIR::PathIdentSegment &final_segment,
const Analysis::NodeMapping &mappings,
Location expr_locus, bool is_qualified_path)
{
HIR::Item *resolved_item
= ctx->get_mappings ()->lookup_hir_item (mappings.get_crate_num (), ref);
bool is_hir_item = resolved_item != nullptr;
if (is_hir_item)
{
if (!lookup->has_subsititions_defined ())
return CompileItem::compile (resolved_item, ctx, true, nullptr, true,
expr_locus);
else
return CompileItem::compile (resolved_item, ctx, true, lookup, true,
expr_locus);
}
else
{
HirId parent_impl_id = UNKNOWN_HIRID;
HIR::ImplItem *resolved_item
= ctx->get_mappings ()->lookup_hir_implitem (mappings.get_crate_num (),
ref, &parent_impl_id);
bool is_impl_item = resolved_item != nullptr;
if (is_impl_item)
{
rust_assert (parent_impl_id != UNKNOWN_HIRID);
HIR::Item *impl_ref
= ctx->get_mappings ()->lookup_hir_item (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 ())
return CompileInherentImplItem::Compile (self, resolved_item, ctx,
true, nullptr, true,
expr_locus);
else
return CompileInherentImplItem::Compile (self, resolved_item, ctx,
true, lookup, true,
expr_locus);
}
else
{
// it might be resolved to a trait item
HIR::TraitItem *trait_item
= ctx->get_mappings ()->lookup_hir_trait_item (
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 (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::PathProbeImplTrait::Probe (receiver, final_segment,
trait_ref);
if (candidates.size () == 0)
{
// this means we are defaulting back to the trait_item if
// possible
Resolver::TraitItemReference *trait_item_ref = nullptr;
bool ok = trait_ref->lookup_hir_trait_item (*trait_item,
&trait_item_ref);
rust_assert (ok); // found
rust_assert (trait_item_ref->is_optional ()); // has definition
Analysis::NodeMapping trait_mappings
= trait_item_ref->get_parent_trait_mappings ();
auto associated_impl_id
= ctx->get_tyctx ()->lookup_associated_impl_mapping_for_self (
trait_mappings.get_hirid (), receiver);
rust_assert (associated_impl_id != UNKNOWN_HIRID);
Resolver::AssociatedImplTrait *associated = nullptr;
bool found_associated_trait_impl
= ctx->get_tyctx ()->lookup_associated_trait_impl (
associated_impl_id, &associated);
rust_assert (found_associated_trait_impl);
associated->setup_associated_types ();
return CompileTraitItem::Compile (
receiver, trait_item_ref->get_hir_trait_item (), ctx, lookup,
true, expr_locus);
}
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 ())
return CompileInherentImplItem::Compile (self, impl_item, ctx,
true, nullptr, true,
expr_locus);
else
return CompileInherentImplItem::Compile (self, impl_item, ctx,
true, lookup, true,
expr_locus);
lookup->set_ty_ref (impl_item->get_impl_mappings ().get_hirid ());
}
}
}
return ctx->get_backend ()->error_expression ();
}
} // namespace Compile
} // namespace Rust
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