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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* hir_expand/vtable.cpp
* - VTable Generation
*/
#include "main_bindings.hpp"
#include <hir/hir.hpp>
#include <hir/visitor.hpp>
#include <hir_typeck/common.hpp> // visit_ty_with
#include <algorithm> // ::std::any_of
namespace {
class OuterVisitor:
public ::HIR::Visitor
{
//StaticTraitResolve m_resolve;
::std::function<::HIR::SimplePath(bool, ::std::string, ::HIR::Struct)> m_new_type;
::HIR::SimplePath m_lang_Sized;
public:
OuterVisitor(const ::HIR::Crate& crate)//:
//m_resolve(crate)
{
m_lang_Sized = crate.get_lang_item_path_opt("sized");
}
void visit_module(::HIR::ItemPath p, ::HIR::Module& mod) override
{
auto saved_nt = mv$(m_new_type);
::std::vector< decltype(mod.m_mod_items)::value_type> new_types;
m_new_type = [&](bool pub, auto name, auto s)->auto {
auto boxed = box$( (::HIR::VisEnt< ::HIR::TypeItem> { pub, ::HIR::TypeItem( mv$(s) ) }) );
auto ret = (p + name).get_simple_path();
new_types.push_back( ::std::make_pair( mv$(name), mv$(boxed)) );
return ret;
};
::HIR::Visitor::visit_module(p, mod);
for(auto& i : new_types )
mod.m_mod_items.insert( mv$(i) );
m_new_type = mv$(saved_nt);
}
void visit_trait(::HIR::ItemPath p, ::HIR::Trait& tr) override
{
static Span sp;
TRACE_FUNCTION_F(p);
::HIR::GenericPath trait_path( p.get_simple_path() );
{
unsigned int i = 0;
for(const auto& tp : tr.m_params.m_types) {
trait_path.m_params.m_types.push_back( ::HIR::TypeRef(tp.m_name, i) );
i ++;
}
}
::std::unordered_map< ::std::string,unsigned int> assoc_type_indexes;
struct Foo {
::HIR::Trait* trait_ptr;
unsigned int i;
void add_types_from_trait(const ::HIR::Trait& tr) {
for(const auto& ty : tr.m_types) {
trait_ptr->m_type_indexes[ty.first] = i;
i ++;
}
// TODO: Iterate supertraits too.
for(const auto& st : tr.m_parent_traits) {
add_types_from_trait(*st.m_trait_ptr);
}
}
};
Foo { &tr, static_cast<unsigned int>(tr.m_params.m_types.size()) }.add_types_from_trait(tr);
auto clone_cb = [&](const auto& t, auto& o) {
if(t.m_data.is_Path() && t.m_data.as_Path().path.m_data.is_UfcsKnown()) {
const auto& pe = t.m_data.as_Path().path.m_data.as_UfcsKnown();
DEBUG("t=" << t);
if( *pe.type == ::HIR::TypeRef("Self", 0xFFFF) /*&& pe.trait == trait_path*/ ) {
// Replace with a new type param, need to know the index of it
o = ::HIR::TypeRef("a#"+pe.item, tr.m_type_indexes.at(pe.item));
return true;
}
}
return false;
};
auto clone_self_cb = [](const auto& t, auto&o) {
if( t == ::HIR::TypeRef("Self", 0xFFFF) ) {
o = ::HIR::TypeRef::new_unit();
return true;
}
return false;
};
::HIR::t_struct_fields fields;
for(auto& vi : tr.m_values)
{
TU_MATCHA( (vi.second), (ve),
(Function,
if( ve.m_receiver == ::HIR::Function::Receiver::Free ) {
DEBUG("- '" << vi.first << "' Skip free function"); // ?
continue ;
}
if( ::std::any_of(ve.m_params.m_bounds.begin(), ve.m_params.m_bounds.end(), [&](const auto& b){
return b.is_TraitBound() && b.as_TraitBound().type == ::HIR::TypeRef("Self", 0xFFFF) && b.as_TraitBound().trait.m_path.m_path == m_lang_Sized;
}) )
{
DEBUG("- '" << vi.first << "' Skip where `Self: Sized`");
continue ;
}
if( ve.m_params.m_types.size() > 0 ) {
DEBUG("- '" << vi.first << "' NOT object safe (generic), not creating vtable");
return ;
}
::HIR::FunctionType ft;
ft.is_unsafe = ve.m_unsafe;
ft.m_abi = ve.m_abi;
ft.m_rettype = box$( clone_ty_with(sp, ve.m_return, clone_cb) );
ft.m_arg_types.reserve( ve.m_args.size() );
ft.m_arg_types.push_back( clone_ty_with(sp, ve.m_args[0].second, clone_self_cb) );
for(unsigned int i = 1; i < ve.m_args.size(); i ++)
ft.m_arg_types.push_back( clone_ty_with(sp, ve.m_args[i].second, clone_cb) );
// Clear the first argument (the receiver)
::HIR::TypeRef fcn_type( mv$(ft) );
// Detect use of `Self` and don't create the vtable if there is.
if( visit_ty_with(fcn_type, [&](const auto& t){ return (t == ::HIR::TypeRef("Self", 0xFFFF)); }) )
{
DEBUG("- '" << vi.first << "' NOT object safe (Self), not creating vtable - " << fcn_type);
return ;
}
vi.second.vtable_ofs = fields.size();
fields.push_back( ::std::make_pair(
vi.first,
::HIR::VisEnt< ::HIR::TypeRef> { true, mv$(fcn_type) }
) );
),
(Static,
TODO(Span(), "Associated static in vtable");
),
(Constant,
//TODO(Span(), "Associated const in vtable");
)
)
}
::HIR::PathParams params;
::HIR::GenericParams args;
{
unsigned int i = 0;
for(const auto& tp : tr.m_params.m_types) {
args.m_types.push_back( ::HIR::TypeParamDef { tp.m_name, {}, tp.m_is_sized } );
params.m_types.push_back( ::HIR::TypeRef(tp.m_name, i) );
i ++;
}
for(const auto& ty : tr.m_types) {
args.m_types.push_back( ::HIR::TypeParamDef { "a#"+ty.first, {}, ty.second.is_sized } );
::HIR::Path path( ::HIR::TypeRef("Self",0xFFFF), trait_path.clone(), ty.first );
params.m_types.push_back( ::HIR::TypeRef( mv$(path) ) );
i ++;
}
}
// TODO: Would like to have access to the publicity marker
auto item_path = m_new_type(true, FMT(p.get_name() << "#vtable"), ::HIR::Struct {
mv$(args),
::HIR::Struct::Repr::Rust,
::HIR::Struct::Data(mv$(fields)),
{}
});
DEBUG("Vtable structure created - " << item_path);
::HIR::GenericPath path( mv$(item_path), mv$(params) );
tr.m_values.insert( ::std::make_pair(
"#vtable",
::HIR::TraitValueItem(::HIR::Static { false, ::HIR::TypeRef( mv$(path) ), {},{} })
) );
}
void visit_trait_impl(const ::HIR::SimplePath& trait_path, ::HIR::TraitImpl& impl) override
{
TRACE_FUNCTION_F("impl " << trait_path << " for " << impl.m_type);
//auto _ = this->m_resolve.set_impl_generics(impl.m_params);
::HIR::Visitor::visit_trait_impl(trait_path, impl);
}
};
}
void HIR_Expand_VTables(::HIR::Crate& crate)
{
OuterVisitor ov(crate);
ov.visit_crate( crate );
}
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