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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* trans/auto_impls.cpp
* - Automatic trait/method impls
*
* Handles implementing Clone (when in 1.29 mode)
*/
#include "main_bindings.hpp"
#include "trans_list.hpp"
#include <hir/hir.hpp>
#include <mir/mir.hpp>
#include <hir_typeck/common.hpp> // monomorph
#include <hir_typeck/static.hpp> // StaticTraitResolve
#include <deque>
#include <algorithm> // find_if
namespace {
struct State
{
::HIR::Crate& crate;
StaticTraitResolve resolve;
const TransList& trans_list;
::std::deque<::HIR::TypeRef> todo_list;
::std::set<::HIR::TypeRef> done_list;
::HIR::SimplePath lang_Clone;
State(::HIR::Crate& crate, const TransList& trans_list):
crate(crate),
resolve( crate ),
trans_list(trans_list)
{
lang_Clone = crate.get_lang_item_path(Span(), "clone");
}
void enqueue_type(const ::HIR::TypeRef& ty) {
if( this->trans_list.auto_clone_impls.count(ty) == 0 && this->done_list.count(ty) == 0 ) {
this->done_list.insert( ty.clone() );
this->todo_list.push_back( ty.clone() );
}
}
};
}
namespace {
::MIR::Param clone_field(const State& state, const Span& sp, ::MIR::Function& mir_fcn, const ::HIR::TypeRef& subty, ::MIR::LValue fld_lvalue)
{
if( state.resolve.type_is_copy(sp, subty) )
{
return ::std::move(fld_lvalue);
}
else
{
const auto& lang_Clone = state.resolve.m_crate.get_lang_item_path(sp, "clone");
// Allocate to locals (one for the `&T`, the other for the cloned `T`)
auto borrow_lv = ::MIR::LValue::new_Local( mir_fcn.locals.size() );
mir_fcn.locals.push_back(::HIR::TypeRef::new_borrow(::HIR::BorrowType::Shared, subty.clone()));
auto res_lv = ::MIR::LValue::new_Local( mir_fcn.locals.size() );
mir_fcn.locals.push_back(subty.clone());
// Call `<T as Clone>::clone`, passing a borrow of the field
::MIR::BasicBlock bb;
bb.statements.push_back(::MIR::Statement::make_Assign({
borrow_lv.clone(),
::MIR::RValue::make_Borrow({ 0, ::HIR::BorrowType::Shared, mv$(fld_lvalue) })
}));
bb.terminator = ::MIR::Terminator::make_Call({
static_cast<unsigned>(mir_fcn.blocks.size() + 2), // return block (after the panic block below)
static_cast<unsigned>(mir_fcn.blocks.size() + 1), // panic block (next block)
res_lv.clone(),
::MIR::CallTarget( ::HIR::Path(subty.clone(), lang_Clone, "clone") ),
::make_vec1<::MIR::Param>( ::std::move(borrow_lv) )
});
mir_fcn.blocks.push_back(::std::move( bb ));
// Stub panic handling (TODO: Make this iterate `values` and drop all of them)
::MIR::BasicBlock panic_bb;
panic_bb.terminator = ::MIR::Terminator::make_Diverge({});
mir_fcn.blocks.push_back(::std::move( panic_bb ));
// Save the output of the `clone` call
return ::std::move(res_lv);
}
}
}
void Trans_AutoImpl_Clone(State& state, ::HIR::TypeRef ty)
{
Span sp;
TRACE_FUNCTION_F(ty);
// Create MIR
::MIR::Function mir_fcn;
if( state.resolve.type_is_copy(sp, ty) )
{
::MIR::BasicBlock bb;
bb.statements.push_back(::MIR::Statement::make_Assign({
::MIR::LValue::new_Return(),
::MIR::RValue::make_Use( ::MIR::LValue::new_Deref( ::MIR::LValue::new_Argument(0) ) )
}));
bb.terminator = ::MIR::Terminator::make_Return({});
mir_fcn.blocks.push_back(::std::move( bb ));
}
else
{
TU_MATCH_HDRA( (ty.m_data), {)
default:
TODO(sp, "auto Clone for " << ty << " - Unknown and not Copy");
TU_ARMA(Path, te) {
if( te.is_closure() ) {
const auto& gp = te.path.m_data.as_Generic();
const auto& str = state.resolve.m_crate.get_struct_by_path(sp, gp.m_path);
Trans_Params p;
p.sp = sp;
p.pp_impl = gp.m_params.clone();
::std::vector< ::MIR::Param> values; values.reserve( str.m_data.as_Tuple().size() );
for(const auto& fld : str.m_data.as_Tuple())
{
::HIR::TypeRef tmp;
const auto& ty_m = monomorphise_type_needed(fld.ent) ? (tmp = p.monomorph(state.resolve, fld.ent)) : fld.ent;
auto fld_lvalue = ::MIR::LValue::new_Field( ::MIR::LValue::new_Deref(::MIR::LValue::new_Argument(0)), static_cast<unsigned>(values.size()) );
values.push_back( clone_field(state, sp, mir_fcn, ty_m, mv$(fld_lvalue)) );
}
// Construct the result value
::MIR::BasicBlock bb;
bb.statements.push_back(::MIR::Statement::make_Assign({
::MIR::LValue::new_Return(),
::MIR::RValue::make_Struct({ gp.clone(), mv$(values) })
}));
bb.terminator = ::MIR::Terminator::make_Return({});
mir_fcn.blocks.push_back(::std::move( bb ));
}
else {
TODO(sp, "auto Clone for " << ty << " - Unknown and not Copy");
}
}
TU_ARMA(Array, te) {
ASSERT_BUG(sp, te.size_val < 256, "TODO: Is more than 256 elements sane for auto-generated non-Copy Clone impl? " << ty);
::std::vector< ::MIR::Param> values; values.reserve(te.size_val);
for(size_t i = 0; i < te.size_val; i ++)
{
auto fld_lvalue = ::MIR::LValue::new_Field( ::MIR::LValue::new_Deref(::MIR::LValue::new_Argument(0)), static_cast<unsigned>(values.size()) );
values.push_back( clone_field(state, sp, mir_fcn, *te.inner, mv$(fld_lvalue)) );
}
// Construct the result
::MIR::BasicBlock bb;
bb.statements.push_back(::MIR::Statement::make_Assign({
::MIR::LValue::new_Return(),
::MIR::RValue::make_Array({ mv$(values) })
}));
bb.terminator = ::MIR::Terminator::make_Return({});
mir_fcn.blocks.push_back(::std::move( bb ));
}
TU_ARMA(Tuple, te) {
assert(te.size() > 0);
::std::vector< ::MIR::Param> values; values.reserve(te.size());
// For each field of the tuple, create a clone (either using Copy if posible, or calling Clone::clone)
for(const auto& subty : te)
{
auto fld_lvalue = ::MIR::LValue::new_Field( ::MIR::LValue::new_Deref(::MIR::LValue::new_Argument(0)), static_cast<unsigned>(values.size()) );
values.push_back( clone_field(state, sp, mir_fcn, subty, mv$(fld_lvalue)) );
}
// Construct the result tuple
::MIR::BasicBlock bb;
bb.statements.push_back(::MIR::Statement::make_Assign({
::MIR::LValue::new_Return(),
::MIR::RValue::make_Tuple({ mv$(values) })
}));
bb.terminator = ::MIR::Terminator::make_Return({});
mir_fcn.blocks.push_back(::std::move( bb ));
}
}
}
// Function
::HIR::Function fcn {
/*m_save_code=*/false,
::HIR::Linkage {},
::HIR::Function::Receiver::BorrowShared,
/*m_abi=*/ABI_RUST,
/*m_unsafe =*/false,
/*m_const=*/false,
::HIR::GenericParams {},
/*m_args=*/::make_vec1(::std::make_pair(
::HIR::Pattern( ::HIR::PatternBinding(false, ::HIR::PatternBinding::Type::Move, "self", 0), ::HIR::Pattern::Data::make_Any({}) ),
::HIR::TypeRef::new_borrow(::HIR::BorrowType::Shared, ty.clone())
)),
/*m_variadic=*/false,
/*m_return=*/ty.clone(),
::HIR::ExprPtr {}
};
fcn.m_code.m_mir = ::MIR::FunctionPointer( new ::MIR::Function(mv$(mir_fcn)) );
// Impl
::HIR::TraitImpl impl;
impl.m_type = mv$(ty);
impl.m_methods.insert(::std::make_pair( RcString::new_interned("clone"), ::HIR::TraitImpl::ImplEnt< ::HIR::Function> { false, ::std::move(fcn) } ));
// Add impl to the crate
auto& list = state.crate.m_trait_impls[state.lang_Clone].get_list_for_type_mut(impl.m_type);
list.push_back( box$(impl) );
}
void Trans_AutoImpls(::HIR::Crate& crate, TransList& trans_list)
{
if( TARGETVER_1_19 )
return ;
State state { crate, trans_list };
// Generate for all
for(const auto& ty : trans_list.auto_clone_impls)
{
state.done_list.insert( ty.clone() );
Trans_AutoImpl_Clone(state, ty.clone());
}
while( !state.todo_list.empty() )
{
auto ty = ::std::move(state.todo_list.front());
state.todo_list.pop_back();
Trans_AutoImpl_Clone(state, mv$(ty));
}
auto impl_list_it = crate.m_trait_impls.find(state.lang_Clone);
for(const auto& ty : state.done_list)
{
assert(impl_list_it != crate.m_trait_impls.end());
// TODO: Find a way of turning a set into a vector so items can be erased.
auto p = ::HIR::Path(ty.clone(), ::HIR::GenericPath(state.lang_Clone), "clone");
//DEBUG("add_function(" << p << ")");
auto e = trans_list.add_function(::std::move(p));
const auto* impl_list = impl_list_it->second.get_list_for_type(ty);
ASSERT_BUG(Span(), impl_list, "No impl list of Clone for " << ty);
auto& impl = **::std::find_if( impl_list->begin(), impl_list->end(), [&](const auto& i){ return i->m_type == ty; });
assert( impl.m_methods.size() == 1 );
e->ptr = &impl.m_methods.begin()->second.data;
}
}
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