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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* hir_expand/erased_types.cpp
* - HIR Expansion - Replace `impl Trait` with the real type
*/
#include <hir/visitor.hpp>
#include <hir/expr.hpp>
#include <hir_typeck/static.hpp>
#include <algorithm>
#include "main_bindings.hpp"
const ::HIR::Function& HIR_Expand_ErasedType_GetFunction(const Span& sp, const StaticTraitResolve& resolve, const ::HIR::Path& origin_path, t_cb_generic& monomorph_cb, ::HIR::PathParams& impl_params)
{
const ::HIR::Function* fcn_ptr = nullptr;
switch(origin_path.m_data.tag())
{
case ::HIR::Path::Data::TAGDEAD:
BUG(Span(), "DEAD in ErasedType - " << origin_path);
case ::HIR::Path::Data::TAG_UfcsUnknown:
BUG(Span(), "UfcsUnknown in ErasedType - " << origin_path);
case ::HIR::Path::Data::TAG_Generic: {
const auto& pe = origin_path.m_data.as_Generic();
monomorph_cb = monomorphise_type_get_cb(sp, nullptr, nullptr, &pe.m_params);
fcn_ptr = &resolve.m_crate.get_function_by_path(sp, pe.m_path);
} break;
case ::HIR::Path::Data::TAG_UfcsKnown:
// NOTE: This isn't possible yet (will it be? or will it expand to an associated type?)
TODO(sp, "Replace ErasedType - " << origin_path << " with source (UfcsKnown)");
break;
case ::HIR::Path::Data::TAG_UfcsInherent: {
const auto& pe = origin_path.m_data.as_UfcsInherent();
// 1. Find correct impl block for the path
const ::HIR::TypeImpl* impl_ptr = nullptr;
resolve.m_crate.find_type_impls(*pe.type, [&](const auto& ty)->const auto& { return ty; },
[&](const auto& impl) {
DEBUG("- impl" << impl.m_params.fmt_args() << " " << impl.m_type);
auto it = impl.m_methods.find(pe.item);
if( it == impl.m_methods.end() )
return false;
fcn_ptr = &it->second.data;
impl_ptr = &impl;
return true;
});
ASSERT_BUG(sp, fcn_ptr, "Failed to locate function " << origin_path);
assert(impl_ptr);
// 2. Obtain monomorph_cb (including impl params)
impl_params.m_types.resize(impl_ptr->m_params.m_types.size());
impl_ptr->m_type .match_test_generics(sp, *pe.type, [](const auto& x)->const auto&{return x;}, [&](auto idx, const auto& /*name*/, const auto& ty) {
assert( idx < impl_params.m_types.size() );
impl_params.m_types[idx] = ty.clone();
return ::HIR::Compare::Equal;
});
for(const auto& t : impl_params.m_types)
{
if( t == ::HIR::TypeRef() )
{
TODO(sp, "Handle ErasedType where an impl parameter comes from a bound - " << origin_path);
}
}
monomorph_cb = monomorphise_type_get_cb(sp, &*pe.type, &impl_params, &pe.params);
} break;
}
assert(fcn_ptr);
return *fcn_ptr;
}
namespace {
class ExprVisitor_Extract:
public ::HIR::ExprVisitorDef
{
const StaticTraitResolve& m_resolve;
public:
ExprVisitor_Extract(const StaticTraitResolve& resolve):
m_resolve(resolve)
{
}
void visit_root(::HIR::ExprPtr& root)
{
root->visit(*this);
visit_type(root->m_res_type);
for(auto& ty : root.m_bindings)
visit_type(ty);
for(auto& ty : root.m_erased_types)
visit_type(ty);
}
void visit_node_ptr(::std::unique_ptr< ::HIR::ExprNode>& node_ptr) override {
assert(node_ptr);
node_ptr->visit(*this);
visit_type(node_ptr->m_res_type);
}
void visit_type(::HIR::TypeRef& ty) override
{
static Span sp;
if( ty.m_data.is_ErasedType() )
{
TRACE_FUNCTION_FR(ty, ty);
const auto& e = ty.m_data.as_ErasedType();
::HIR::PathParams impl_params; // cache.
t_cb_generic monomorph_cb;
const auto& fcn = HIR_Expand_ErasedType_GetFunction(sp, m_resolve, e.m_origin, monomorph_cb, impl_params);
const auto& erased_types = fcn.m_code.m_erased_types;
ASSERT_BUG(sp, e.m_index < erased_types.size(), "Erased type index out of range for " << e.m_origin << " - " << e.m_index << " >= " << erased_types.size());
const auto& tpl = erased_types[e.m_index];
auto new_ty = monomorphise_type_with(sp, tpl, monomorph_cb);
DEBUG("> " << ty << " => " << new_ty);
ty = mv$(new_ty);
// Recurse (TODO: Cleanly prevent infinite recursion - TRACE_FUNCTION does crude prevention)
visit_type(ty);
}
else
{
::HIR::ExprVisitorDef::visit_type(ty);
}
}
};
class OuterVisitor:
public ::HIR::Visitor
{
StaticTraitResolve m_resolve;
const ::HIR::ItemPath* m_fcn_path = nullptr;
public:
OuterVisitor(const ::HIR::Crate& crate):
m_resolve(crate)
{}
void visit_expr(::HIR::ExprPtr& exp) override
{
if( exp )
{
ExprVisitor_Extract ev(m_resolve);
ev.visit_root( exp );
}
}
void visit_function(::HIR::ItemPath p, ::HIR::Function& fcn) override
{
m_fcn_path = &p;
::HIR::Visitor::visit_function(p, fcn);
m_fcn_path = nullptr;
}
};
class OuterVisitor_Fixup:
public ::HIR::Visitor
{
StaticTraitResolve m_resolve;
public:
OuterVisitor_Fixup(const ::HIR::Crate& crate):
m_resolve(crate)
{}
void visit_type(::HIR::TypeRef& ty) override
{
static const Span sp;
if( ty.m_data.is_ErasedType() )
{
const auto& e = ty.m_data.as_ErasedType();
TRACE_FUNCTION_FR(ty, ty);
::HIR::PathParams impl_params;
t_cb_generic monomorph_cb;
const auto& fcn = HIR_Expand_ErasedType_GetFunction(sp, m_resolve, e.m_origin, monomorph_cb, impl_params);
const auto& erased_types = fcn.m_code.m_erased_types;
ASSERT_BUG(sp, e.m_index < erased_types.size(), "Erased type index out of range for " << e.m_origin << " - " << e.m_index << " >= " << erased_types.size());
const auto& tpl = erased_types[e.m_index];
auto new_ty = monomorphise_type_with(sp, tpl, monomorph_cb);
DEBUG("> " << ty << " => " << new_ty);
ty = mv$(new_ty);
// Recurse (TODO: Cleanly prevent infinite recursion - TRACE_FUNCTION does crude prevention)
visit_type(ty);
}
else
{
::HIR::Visitor::visit_type(ty);
}
}
};
}
void HIR_Expand_ErasedType(::HIR::Crate& crate)
{
OuterVisitor ov(crate);
ov.visit_crate( crate );
OuterVisitor_Fixup ov_fix(crate);
ov_fix.visit_crate(crate);
}
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