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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* mir/cleanup.cpp
* - MIR Cleanup
*
* Removes artefacts left after monomorphisation
* - Converts <Trait as Trait>::method() into a vtable call
* - Replaces constants by their value
*/
#include "main_bindings.hpp"
#include "mir.hpp"
#include <hir/visitor.hpp>
#include <hir_typeck/static.hpp>
#include <mir/helpers.hpp>
const ::HIR::Literal* MIR_Cleanup_GetConstant(const Span& sp, const StaticTraitResolve& resolve, const ::HIR::Path& path, ::HIR::TypeRef& out_ty)
{
TU_MATCHA( (path.m_data), (pe),
(Generic,
const auto& constant = resolve.m_crate.get_constant_by_path(sp, pe.m_path);
if( pe.m_params.m_types.size() != 0 )
TODO(sp, "Generic constants - " << path);
out_ty = constant.m_type.clone();
return &constant.m_value_res;
),
(UfcsUnknown,
),
(UfcsKnown,
),
(UfcsInherent,
)
)
return nullptr;
}
::MIR::LValue MIR_Cleanup_Virtualize(
const Span& sp, const ::MIR::TypeResolve& state, ::MIR::Function& fcn,
::MIR::BasicBlock& block, ::MIR::LValue& receiver_lvp,
const ::HIR::TypeRef::Data::Data_TraitObject& te, const ::HIR::Path::Data::Data_UfcsKnown& pe
)
{
assert( te.m_trait.m_trait_ptr );
const auto& trait = *te.m_trait.m_trait_ptr;
// 1. Get the vtable index for this function
auto it = trait.m_value_indexes.find( pe.item );
while( it != trait.m_value_indexes.end() )
{
DEBUG("- " << it->second.second);
if( it->second.second.m_path == pe.trait.m_path )
{
// TODO: Match generics using match_test_generics comparing to the trait args
break ;
}
++ it;
}
if( it == trait.m_value_indexes.end() || it->first != pe.item )
BUG(sp, "Calling method '" << pe.item << "' from " << pe.trait << " through " << te.m_trait.m_path << " which isn't in the vtable");
unsigned int vtable_idx = it->second.first;
// 2. Load from the vtable
auto vtable_ty_spath = te.m_trait.m_path.m_path;
vtable_ty_spath.m_components.back() += "#vtable";
const auto& vtable_ref = state.m_resolve.m_crate.get_struct_by_path(sp, vtable_ty_spath);
// Copy the param set from the trait in the trait object
::HIR::PathParams vtable_params = te.m_trait.m_path.m_params.clone();
// - Include associated types on bound
for(const auto& ty_b : te.m_trait.m_type_bounds) {
auto idx = trait.m_type_indexes.at(ty_b.first);
if(vtable_params.m_types.size() <= idx)
vtable_params.m_types.resize(idx+1);
vtable_params.m_types[idx] = ty_b.second.clone();
}
auto vtable_ty = ::HIR::TypeRef::new_pointer(
::HIR::BorrowType::Shared,
::HIR::TypeRef( ::HIR::GenericPath(vtable_ty_spath, mv$(vtable_params)), &vtable_ref )
);
// Allocate a temporary for the vtable pointer itself
auto vtable_lv = ::MIR::LValue::make_Temporary({ static_cast<unsigned int>(fcn.temporaries.size()) });
fcn.temporaries.push_back( mv$(vtable_ty) );
// - Load the vtable and store it
auto vtable_rval = ::MIR::RValue::make_DstMeta({ ::MIR::LValue::make_Deref({ box$(receiver_lvp.clone()) }) });
block.statements.push_back( ::MIR::Statement::make_Assign({ vtable_lv.clone(), mv$(vtable_rval) }) );
auto ptr_rval = ::MIR::RValue::make_DstPtr({ ::MIR::LValue::make_Deref({ box$(receiver_lvp.clone()) }) });
auto ptr_lv = ::MIR::LValue::make_Temporary({ static_cast<unsigned int>(fcn.temporaries.size()) });
fcn.temporaries.push_back( ::HIR::TypeRef::new_pointer(::HIR::BorrowType::Shared, ::HIR::TypeRef::new_unit()) );
block.statements.push_back( ::MIR::Statement::make_Assign({ ptr_lv.clone(), mv$(ptr_rval) }) );
receiver_lvp = mv$(ptr_lv);
// Update the terminator with the new information.
return ::MIR::LValue::make_Field({ box$(::MIR::LValue::make_Deref({ box$(vtable_lv) })), vtable_idx });
}
void MIR_Cleanup(const StaticTraitResolve& resolve, const ::HIR::ItemPath& path, ::MIR::Function& fcn, const ::HIR::Function::args_t& args, const ::HIR::TypeRef& ret_type)
{
Span sp;
::MIR::TypeResolve state { sp, resolve, FMT_CB(ss, ss << path;), ret_type, args, fcn };
for(auto& block : fcn.blocks)
{
for(auto it = block.statements.begin(); it != block.statements.end(); ++ it)
{
auto& stmt = *it;
::std::vector< ::MIR::Statement> new_stmts;
auto new_temporary = [&](::HIR::TypeRef ty, ::MIR::RValue val)->::MIR::LValue {
auto rv = ::MIR::LValue::make_Temporary({ static_cast<unsigned int>(fcn.temporaries.size()) });
fcn.temporaries.push_back( mv$(ty) );
new_stmts.push_back( ::MIR::Statement::make_Assign({ rv.clone(), mv$(val) }) );
return rv;
};
if( stmt.is_Assign() )
{
auto& se = stmt.as_Assign();
TU_IFLET( ::MIR::RValue, se.src, Constant, e,
// TODO: Replace `Const` with actual values
TU_IFLET( ::MIR::Constant, e, Const, ce,
// 1. Find the constant
::HIR::TypeRef ty;
const auto* lit_ptr = MIR_Cleanup_GetConstant(sp, resolve, ce.p, ty);
if( lit_ptr )
{
TU_MATCH_DEF( ::HIR::TypeRef::Data, (ty.m_data), (te),
(
//TODO(sp, "Literal of type " << ty << " - " << *lit_ptr);
),
(Primitive,
switch(te)
{
case ::HIR::CoreType::Char:
case ::HIR::CoreType::Usize:
case ::HIR::CoreType::U64:
case ::HIR::CoreType::U32:
case ::HIR::CoreType::U16:
case ::HIR::CoreType::U8:
e = ::MIR::Constant::make_Uint( lit_ptr->as_Integer() );
break;
case ::HIR::CoreType::Isize:
case ::HIR::CoreType::I64:
case ::HIR::CoreType::I32:
case ::HIR::CoreType::I16:
case ::HIR::CoreType::I8:
e = ::MIR::Constant::make_Int( lit_ptr->as_Integer() );
break;
case ::HIR::CoreType::F64:
case ::HIR::CoreType::F32:
e = ::MIR::Constant::make_Float( lit_ptr->as_Float() );
break;
case ::HIR::CoreType::Bool:
e = ::MIR::Constant::make_Bool( !!lit_ptr->as_Integer() );
break;
case ::HIR::CoreType::Str:
BUG(sp, "Const of type `str` - " << ce.p);
}
),
(Pointer,
if( lit_ptr->is_BorrowOf() ) {
// TODO:
}
else {
auto lval = new_temporary( ::HIR::CoreType::Usize, ::MIR::RValue( ::MIR::Constant::make_Uint( lit_ptr->as_Integer() ) ) );
se.src = ::MIR::RValue::make_Cast({ mv$(lval), mv$(ty) });
}
),
(Borrow,
if( lit_ptr->is_BorrowOf() ) {
// TODO:
}
else if( te.inner->m_data.is_Slice() && *te.inner->m_data.as_Slice().inner == ::HIR::CoreType::U8 ) {
::std::vector<uint8_t> bytestr;
for(auto v : lit_ptr->as_String())
bytestr.push_back( static_cast<uint8_t>(v) );
e = ::MIR::Constant::make_Bytes( mv$(bytestr) );
}
else if( te.inner->m_data.is_Array() && *te.inner->m_data.as_Array().inner == ::HIR::CoreType::U8 ) {
// TODO: How does this differ at codegen to the above?
::std::vector<uint8_t> bytestr;
for(auto v : lit_ptr->as_String())
bytestr.push_back( static_cast<uint8_t>(v) );
e = ::MIR::Constant::make_Bytes( mv$(bytestr) );
}
else if( *te.inner == ::HIR::CoreType::Str ) {
e = ::MIR::Constant::make_StaticString( lit_ptr->as_String() );
}
else {
TODO(sp, "Const with type " << ty);
}
)
)
}
)
if( se.src.is_Cast() )
{
const auto& e = se.src.as_Cast();
::HIR::TypeRef tmp;
const auto& src_ty = state.get_lvalue_type(tmp, e.val);
// TODO: Unsize and CoerceUnsized operations
// - Unsize should create a fat pointer if the pointer class is known (vtable or len)
TU_IFLET( ::HIR::TypeRef::Data, e.type.m_data, Borrow, te
// > & -> & = Unsize, create DST based on the pointer class of the destination.
// (&-ptr being destination is otherwise invalid)
// TODO Share with the CoerceUnsized handling
)
// - CoerceUnsized should re-create the inner type if known.
else TU_IFLET( ::HIR::TypeRef::Data, e.type.m_data, Path, te,
TU_IFLET( ::HIR::TypeRef::Data, src_ty.m_data, Path, ste,
// > Path -> Path = Unsize
// (path being destination is otherwise invalid)
ASSERT_BUG( sp, ! te.binding.is_Unbound(), "" );
ASSERT_BUG( sp, !ste.binding.is_Unbound(), "" );
if( te.binding.is_Opaque() || ste.binding.is_Opaque() ) {
}
else {
// - Types must differ only by a single field, and be from the same definition
ASSERT_BUG(sp, te.binding.tag() == ste.binding.tag(), "" );
// TODO: The CoerceUnsized rule could be in the TraitMarkings (listing the relevant field)
// - Destructure and restrucure with the unsized fields
}
)
else {
ASSERT_BUG( sp, src_ty.m_data.is_Generic(), "Cast to Path from " << src_ty );
}
)
else {
}
}
)
}
for(auto& v : new_stmts) {
it = block.statements.insert(it, mv$(v));
}
}
TU_IFLET( ::MIR::Terminator, block.terminator, Call, e,
TU_IFLET( ::MIR::CallTarget, e.fcn, Path, path,
// Detect calling `<Trait as Trait>::method()` and replace with vtable call
if( path.m_data.is_UfcsKnown() && path.m_data.as_UfcsKnown().type->m_data.is_TraitObject() )
{
const auto& pe = path.m_data.as_UfcsKnown();
const auto& te = pe.type->m_data.as_TraitObject();
// TODO: What if the method is from a supertrait?
if( te.m_trait.m_path == pe.trait || resolve.find_named_trait_in_trait(
sp, pe.trait.m_path, pe.trait.m_params,
*te.m_trait.m_trait_ptr, te.m_trait.m_path.m_path, te.m_trait.m_path.m_params,
*pe.type,
[](const auto&, auto){}
)
)
{
auto tgt_lvalue = MIR_Cleanup_Virtualize(sp, state, fcn, block, e.args.front(), te, pe);
e.fcn = mv$(tgt_lvalue);
}
}
)
)
}
}
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