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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$(saved_nt);
}
void visit_trait(::HIR::ItemPath p, ::HIR::Trait& tr) override
{
TRACE_FUNCTION_F(p);
::HIR::t_struct_fields fields;
for(const auto& vi : tr.m_values)
{
TU_MATCHA( (vi.second), (ve),
(Function,
if( ve.m_receiver == ::HIR::Function::Receiver::Free ) {
DEBUG("- '" << vi.first << "' Skip free function"); // ?
continue ;
}
if( ::std::any_of(ve.m_params.m_bounds.begin(), ve.m_params.m_bounds.end(), [&](const auto& b){
return b.is_TraitBound() && b.as_TraitBound().type == ::HIR::TypeRef("Self", 0xFFFF) && b.as_TraitBound().trait.m_path.m_path == m_lang_Sized;
}) )
{
DEBUG("- '" << vi.first << "' Skip where `Self: Sized`");
continue ;
}
if( ve.m_params.m_types.size() > 0 ) {
DEBUG("- '" << vi.first << "' NOT object safe (generic), not creating vtable");
return ;
}
::HIR::FunctionType ft;
ft.is_unsafe = ve.m_unsafe;
ft.m_abi = ve.m_abi;
ft.m_rettype = box$( ve.m_return.clone() );
for(const auto& t : ve.m_args)
ft.m_arg_types.push_back( t.second.clone() );
ft.m_arg_types[0] = ::HIR::TypeRef(); // Clear the first argument (the receiver)
::HIR::TypeRef fcn_type( mv$(ft) );
// Detect use of `Self`
if( visit_ty_with(fcn_type, [&](const auto& t){
if( t == ::HIR::TypeRef("Self", 0xFFFF) )
return true;
return false;
})
)
{
DEBUG("- '" << vi.first << "' NOT object safe (Self), not creating vtable");
return ;
}
fields.push_back( ::std::make_pair(
vi.first,
::HIR::VisEnt< ::HIR::TypeRef> { true, mv$(fcn_type) }
) );
),
(Static,
TODO(Span(), "Associated static in vtable");
),
(Constant,
//TODO(Span(), "Associated const in vtable");
)
)
}
::HIR::PathParams params;
::HIR::GenericParams args;
// 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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