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rust-hir-type-check-expr.h
1223 lines (1053 loc) · 36.7 KB
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rust-hir-type-check-expr.h
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// Copyright (C) 2020 Free Software Foundation, Inc.
// This file is part of GCC.
// GCC is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3, or (at your option) any later
// version.
// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
// You should have received a copy of the GNU General Public License
// along with GCC; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#ifndef RUST_HIR_TYPE_CHECK_EXPR
#define RUST_HIR_TYPE_CHECK_EXPR
#include "rust-hir-type-check-base.h"
#include "rust-hir-full.h"
#include "rust-tyty.h"
#include "rust-tyty-call.h"
#include "rust-hir-type-check-struct-field.h"
#include "rust-hir-path-probe.h"
#include "rust-substitution-mapper.h"
#include "rust-hir-const-fold.h"
namespace Rust {
namespace Resolver {
class TypeCheckExpr : public TypeCheckBase
{
using Rust::Resolver::TypeCheckBase::visit;
public:
/* Perform type checking on expr. Also runs type unification algorithm.
Returns the unified type of expr.
`inside_loop` acts as a context for BreakExpr, etc. May change later. */
static TyTy::BaseType *Resolve (HIR::Expr *expr, bool inside_loop)
{
TypeCheckExpr resolver (inside_loop);
expr->accept_vis (resolver);
if (resolver.infered == nullptr)
{
rust_error_at (expr->get_locus_slow (),
"failed to type resolve expression");
return new TyTy::ErrorType (expr->get_mappings ().get_hirid ());
}
auto ref = expr->get_mappings ().get_hirid ();
resolver.infered->set_ref (ref);
resolver.context->insert_type (expr->get_mappings (), resolver.infered);
return resolver.infered;
}
void visit (HIR::TupleIndexExpr &expr) override
{
auto resolved
= TypeCheckExpr::Resolve (expr.get_tuple_expr ().get (), inside_loop);
if (resolved == nullptr)
{
rust_error_at (expr.get_tuple_expr ()->get_locus_slow (),
"failed to resolve TupleIndexExpr receiver");
return;
}
bool is_valid_type = resolved->get_kind () == TyTy::TypeKind::ADT
|| resolved->get_kind () == TyTy::TypeKind::TUPLE;
if (!is_valid_type)
{
rust_error_at (expr.get_tuple_expr ()->get_locus_slow (),
"Expected Tuple or ADT got: %s",
resolved->as_string ().c_str ());
return;
}
if (resolved->get_kind () == TyTy::TypeKind::TUPLE)
{
TyTy::TupleType *tuple = static_cast<TyTy::TupleType *> (resolved);
TupleIndex index = expr.get_tuple_index ();
if ((size_t) index >= tuple->num_fields ())
{
rust_error_at (expr.get_locus (), "unknown field at index %i",
index);
return;
}
auto field_tyty = tuple->get_field ((size_t) index);
if (field_tyty == nullptr)
{
rust_error_at (expr.get_locus (),
"failed to lookup field type at index %i", index);
return;
}
infered = field_tyty;
return;
}
TyTy::ADTType *adt = static_cast<TyTy::ADTType *> (resolved);
TupleIndex index = expr.get_tuple_index ();
if ((size_t) index >= adt->num_fields ())
{
rust_error_at (expr.get_locus (), "unknown field at index %i", index);
return;
}
auto field_tyty = adt->get_field ((size_t) index);
if (field_tyty == nullptr)
{
rust_error_at (expr.get_locus (),
"failed to lookup field type at index %i", index);
return;
}
infered = field_tyty->get_field_type ();
}
void visit (HIR::TupleExpr &expr) override
{
if (expr.is_unit ())
{
auto unit_node_id = resolver->get_unit_type_node_id ();
if (!context->lookup_builtin (unit_node_id, &infered))
{
rust_error_at (expr.get_locus (),
"failed to lookup builtin unit type");
}
return;
}
std::vector<TyTy::TyVar> fields;
for (auto &elem : expr.get_tuple_elems ())
{
auto field_ty = TypeCheckExpr::Resolve (elem.get (), false);
fields.push_back (TyTy::TyVar (field_ty->get_ref ()));
}
infered = new TyTy::TupleType (expr.get_mappings ().get_hirid (), fields);
}
void visit (HIR::ReturnExpr &expr) override
{
auto fn_return_tyty = context->peek_return_type ();
rust_assert (fn_return_tyty != nullptr);
TyTy::BaseType *expr_ty;
if (expr.has_return_expr ())
expr_ty = TypeCheckExpr::Resolve (expr.get_expr (), false);
else
expr_ty = new TyTy::TupleType (expr.get_mappings ().get_hirid ());
if (expr_ty == nullptr)
{
rust_error_at (expr.get_locus (),
"failed to resolve type for ReturnExpr");
return;
}
infered = fn_return_tyty->unify (expr_ty);
fn_return_tyty->append_reference (expr_ty->get_ref ());
for (auto &ref : infered->get_combined_refs ())
fn_return_tyty->append_reference (ref);
infered = new TyTy::NeverType (expr.get_mappings ().get_hirid ());
}
void visit (HIR::CallExpr &expr) override
{
TyTy::BaseType *function_tyty
= TypeCheckExpr::Resolve (expr.get_fnexpr (), false);
bool valid_tyty = function_tyty->get_kind () == TyTy::TypeKind::ADT
|| function_tyty->get_kind () == TyTy::TypeKind::FNDEF
|| function_tyty->get_kind () == TyTy::TypeKind::FNPTR;
if (!valid_tyty)
{
rust_error_at (expr.get_locus (),
"Failed to resolve expression of function call");
return;
}
infered = TyTy::TypeCheckCallExpr::go (function_tyty, expr, context);
if (infered == nullptr)
{
rust_error_at (expr.get_locus (), "failed to lookup type to CallExpr");
return;
}
infered->set_ref (expr.get_mappings ().get_hirid ());
}
void visit (HIR::MethodCallExpr &expr) override
{
auto receiver_tyty
= TypeCheckExpr::Resolve (expr.get_receiver ().get (), false);
if (receiver_tyty == nullptr)
{
rust_error_at (expr.get_receiver ()->get_locus_slow (),
"failed to resolve receiver in MethodCallExpr");
return;
}
// https://doc.rust-lang.org/reference/expressions/method-call-expr.html
// method resolution is complex in rust once we start handling generics and
// traits. For now we only support looking up the valid name in impl blocks
// which is simple. There will need to be adjustments to ensure we can turn
// the receiver into borrowed references etc
auto candidates
= PathProbeType::Probe (receiver_tyty,
expr.get_method_name ().get_segment ());
if (candidates.size () == 0)
{
rust_error_at (expr.get_locus (),
"failed to resolve the PathExprSegment to any Method");
return;
}
else if (candidates.size () > 1)
{
ReportMultipleCandidateError::Report (
candidates, expr.get_method_name ().get_segment (),
expr.get_method_name ().get_locus ());
return;
}
auto resolved_candidate = candidates.at (0);
HIR::InherentImplItem *resolved_method = resolved_candidate.impl_item;
TyTy::BaseType *lookup_tyty = resolved_candidate.ty;
if (lookup_tyty->get_kind () != TyTy::TypeKind::FNDEF)
{
RichLocation r (expr.get_method_name ().get_locus ());
r.add_range (resolved_method->get_impl_locus ());
rust_error_at (r, "associated impl item is not a method");
return;
}
TyTy::BaseType *lookup = lookup_tyty;
TyTy::FnType *fn = static_cast<TyTy::FnType *> (lookup);
if (!fn->is_method ())
{
RichLocation r (expr.get_method_name ().get_locus ());
r.add_range (resolved_method->get_impl_locus ());
rust_error_at (r, "associated function is not a method");
return;
}
if (receiver_tyty->get_kind () == TyTy::TypeKind::ADT)
{
TyTy::ADTType *adt = static_cast<TyTy::ADTType *> (receiver_tyty);
if (adt->has_substitutions () && fn->needs_substitution ())
{
// consider the case where we have:
//
// struct Foo<X,Y>(X,Y);
//
// impl<T> Foo<T, i32> {
// fn test<X>(self, a:X) -> (T,X) { (self.0, a) }
// }
//
// In this case we end up with an fn type of:
//
// fn <T,X> test(self:Foo<T,i32>, a:X) -> (T,X)
//
// This means the instance or self we are calling this method for
// will be substituted such that we can get the inherited type
// arguments but then need to use the turbo fish if available or
// infer the remaining arguments. Luckily rust does not allow for
// default types GenericParams on impl blocks since these must
// always be at the end of the list
auto s = fn->get_self_type ();
rust_assert (s->can_eq (adt));
rust_assert (s->get_kind () == TyTy::TypeKind::ADT);
TyTy::ADTType *self_adt = static_cast<TyTy::ADTType *> (s);
// we need to grab the Self substitutions as the inherit type
// parameters for this
if (self_adt->needs_substitution ())
{
rust_assert (adt->was_substituted ());
TyTy::SubstitutionArgumentMappings used_args_in_prev_segment
= GetUsedSubstArgs::From (adt);
TyTy::SubstitutionArgumentMappings inherit_type_args
= self_adt->solve_mappings_from_receiver_for_self (
used_args_in_prev_segment);
// there may or may not be inherited type arguments
if (!inherit_type_args.is_error ())
{
// need to apply the inherited type arguments to the
// function
lookup = fn->handle_substitions (inherit_type_args);
}
}
}
}
// apply any remaining generic arguments
if (expr.get_method_name ().has_generic_args ())
{
HIR::GenericArgs &args = expr.get_method_name ().get_generic_args ();
lookup
= SubstMapper::Resolve (lookup, expr.get_method_name ().get_locus (),
&args);
if (lookup->get_kind () == TyTy::TypeKind::ERROR)
return;
}
else if (lookup->needs_generic_substitutions ())
{
lookup = SubstMapper::InferSubst (lookup,
expr.get_method_name ().get_locus ());
}
TyTy::BaseType *function_ret_tyty
= TyTy::TypeCheckMethodCallExpr::go (lookup, expr, context);
if (function_ret_tyty == nullptr
|| function_ret_tyty->get_kind () == TyTy::TypeKind::ERROR)
{
rust_error_at (expr.get_locus (),
"failed to lookup type to MethodCallExpr");
return;
}
// store the expected fntype
context->insert_type (expr.get_method_name ().get_mappings (), lookup);
// set up the resolved name on the path
resolver->insert_resolved_name (
expr.get_mappings ().get_nodeid (),
resolved_method->get_impl_mappings ().get_nodeid ());
// return the result of the function back
infered = function_ret_tyty;
}
void visit (HIR::AssignmentExpr &expr) override
{
infered = new TyTy::TupleType (expr.get_mappings ().get_hirid ());
auto lhs = TypeCheckExpr::Resolve (expr.get_lhs (), false);
auto rhs = TypeCheckExpr::Resolve (expr.get_rhs (), false);
auto result = lhs->unify (rhs);
if (result->get_kind () == TyTy::TypeKind::ERROR)
return;
// in the case of declare first for an ADT Type:
//
// let a;
// a = Foo{..}
// let b = a.field;
//
// The lhs will have a TyTy of INFER and so when the declaration is
// referenced it will still have an unknown type so we will fail to resolve
// FieldAccessExpr
NodeId ast_node_id = expr.get_lhs ()->get_mappings ().get_nodeid ();
NodeId ref_node_id;
if (!resolver->lookup_resolved_name (ast_node_id, &ref_node_id))
return;
Definition def;
if (!resolver->lookup_definition (ref_node_id, &def))
{
rust_error_at (expr.get_locus (),
"assignment infer - unknown reference");
return;
}
HirId ref;
if (!mappings->lookup_node_to_hir (expr.get_mappings ().get_crate_num (),
def.parent, &ref))
{
rust_error_at (expr.get_locus (),
"assignment infer - reverse lookup failure");
return;
}
context->insert_type (
Analysis::NodeMapping (expr.get_lhs ()->get_mappings ().get_crate_num (),
ref_node_id, ref, UNKNOWN_LOCAL_DEFID),
result->clone ());
}
void visit (HIR::IdentifierExpr &expr) override
{
NodeId ast_node_id = expr.get_mappings ().get_nodeid ();
// then lookup the reference_node_id
NodeId ref_node_id = UNKNOWN_NODEID;
if (resolver->lookup_resolved_name (ast_node_id, &ref_node_id))
{
// these ref_node_ids will resolve to a pattern declaration but we are
// interested in the definition that this refers to get the parent id
Definition def;
if (!resolver->lookup_definition (ref_node_id, &def))
{
rust_error_at (expr.get_locus (),
"unknown reference for resolved name");
return;
}
ref_node_id = def.parent;
}
else if (!resolver->lookup_resolved_type (ast_node_id, &ref_node_id))
{
rust_error_at (expr.get_locus (),
"Failed to lookup type reference for node: %s",
expr.as_string ().c_str ());
return;
}
if (ref_node_id == UNKNOWN_NODEID)
{
rust_error_at (expr.get_locus (), "unresolved node: %s",
expr.as_string ().c_str ());
return;
}
// node back to HIR
HirId ref;
if (!mappings->lookup_node_to_hir (expr.get_mappings ().get_crate_num (),
ref_node_id, &ref))
{
rust_error_at (expr.get_locus (), "reverse lookup failure");
return;
}
// the base reference for this name _must_ have a type set
TyTy::BaseType *lookup;
if (!context->lookup_type (ref, &lookup))
{
rust_error_at (mappings->lookup_location (ref),
"Failed to resolve IdentifierExpr type: %s",
expr.as_string ().c_str ());
return;
}
infered = lookup->clone ();
}
void visit (HIR::LiteralExpr &expr) override
{
switch (expr.get_lit_type ())
{
case HIR::Literal::LitType::INT: {
bool ok = false;
switch (expr.get_literal ()->get_type_hint ())
{
case CORETYPE_I8:
ok = context->lookup_builtin ("i8", &infered);
break;
case CORETYPE_I16:
ok = context->lookup_builtin ("i16", &infered);
break;
case CORETYPE_I32:
ok = context->lookup_builtin ("i32", &infered);
break;
case CORETYPE_I64:
ok = context->lookup_builtin ("i64", &infered);
break;
case CORETYPE_I128:
ok = context->lookup_builtin ("i128", &infered);
break;
case CORETYPE_U8:
ok = context->lookup_builtin ("u8", &infered);
break;
case CORETYPE_U16:
ok = context->lookup_builtin ("u16", &infered);
break;
case CORETYPE_U32:
ok = context->lookup_builtin ("u32", &infered);
break;
case CORETYPE_U64:
ok = context->lookup_builtin ("u64", &infered);
break;
case CORETYPE_U128:
ok = context->lookup_builtin ("u128", &infered);
break;
case CORETYPE_F32:
expr.get_literal ()->set_lit_type (HIR::Literal::LitType::FLOAT);
ok = context->lookup_builtin ("f32", &infered);
break;
case CORETYPE_F64:
expr.get_literal ()->set_lit_type (HIR::Literal::LitType::FLOAT);
ok = context->lookup_builtin ("f64", &infered);
break;
default:
ok = true;
infered = new TyTy::InferType (
expr.get_mappings ().get_hirid (),
TyTy::InferType::InferTypeKind::INTEGRAL);
break;
}
rust_assert (ok);
}
break;
case HIR::Literal::LitType::FLOAT: {
bool ok = false;
switch (expr.get_literal ()->get_type_hint ())
{
case CORETYPE_F32:
ok = context->lookup_builtin ("f32", &infered);
break;
case CORETYPE_F64:
ok = context->lookup_builtin ("f64", &infered);
break;
default:
ok = true;
infered
= new TyTy::InferType (expr.get_mappings ().get_hirid (),
TyTy::InferType::InferTypeKind::FLOAT);
break;
}
rust_assert (ok);
}
break;
case HIR::Literal::LitType::BOOL: {
auto ok = context->lookup_builtin ("bool", &infered);
rust_assert (ok);
}
break;
case HIR::Literal::LitType::CHAR: {
auto ok = context->lookup_builtin ("char", &infered);
rust_assert (ok);
}
break;
case HIR::Literal::LitType::STRING: {
TyTy::BaseType *base = nullptr;
auto ok = context->lookup_builtin ("str", &base);
rust_assert (ok);
infered = new TyTy::ReferenceType (expr.get_mappings ().get_hirid (),
TyTy::TyVar (base->get_ref ()));
}
break;
default:
gcc_unreachable ();
break;
}
infered = infered->clone ();
}
void visit (HIR::ArithmeticOrLogicalExpr &expr) override
{
auto lhs = TypeCheckExpr::Resolve (expr.get_lhs (), false);
auto rhs = TypeCheckExpr::Resolve (expr.get_rhs (), false);
bool valid_lhs = validate_arithmetic_type (lhs, expr.get_expr_type ());
bool valid_rhs = validate_arithmetic_type (rhs, expr.get_expr_type ());
bool valid = valid_lhs && valid_rhs;
if (!valid)
{
rust_error_at (expr.get_locus (),
"cannot apply this operator to types %s and %s",
lhs->as_string ().c_str (), rhs->as_string ().c_str ());
return;
}
infered = lhs->unify (rhs);
infered->append_reference (lhs->get_ref ());
infered->append_reference (rhs->get_ref ());
}
void visit (HIR::ComparisonExpr &expr) override
{
auto lhs = TypeCheckExpr::Resolve (expr.get_lhs (), false);
auto rhs = TypeCheckExpr::Resolve (expr.get_rhs (), false);
auto result = lhs->unify (rhs);
if (result == nullptr || result->get_kind () == TyTy::TypeKind::ERROR)
return;
// we expect this to be
infered = new TyTy::BoolType (expr.get_mappings ().get_hirid ());
infered->append_reference (lhs->get_ref ());
infered->append_reference (rhs->get_ref ());
}
void visit (HIR::LazyBooleanExpr &expr) override
{
auto lhs = TypeCheckExpr::Resolve (expr.get_lhs (), false);
auto rhs = TypeCheckExpr::Resolve (expr.get_rhs (), false);
// we expect the lhs and rhs must be bools at this point
TyTy::BoolType elhs (expr.get_mappings ().get_hirid ());
lhs = elhs.unify (lhs);
if (lhs == nullptr || lhs->get_kind () == TyTy::TypeKind::ERROR)
return;
TyTy::BoolType rlhs (expr.get_mappings ().get_hirid ());
rhs = elhs.unify (rhs);
if (lhs == nullptr || lhs->get_kind () == TyTy::TypeKind::ERROR)
return;
infered = lhs->unify (rhs);
infered->append_reference (lhs->get_ref ());
infered->append_reference (rhs->get_ref ());
}
void visit (HIR::NegationExpr &expr) override
{
auto negated_expr_ty = TypeCheckExpr::Resolve (expr.get_expr (), false);
// https://doc.rust-lang.org/reference/expressions/operator-expr.html#negation-operators
switch (expr.get_expr_type ())
{
case NegationOperator::NEGATE: {
bool valid
= (negated_expr_ty->get_kind () == TyTy::TypeKind::INT)
|| (negated_expr_ty->get_kind () == TyTy::TypeKind::UINT)
|| (negated_expr_ty->get_kind () == TyTy::TypeKind::FLOAT)
|| (negated_expr_ty->get_kind () == TyTy::TypeKind::INFER
&& (((TyTy::InferType *) negated_expr_ty)->get_infer_kind ()
== TyTy::InferType::INTEGRAL))
|| (negated_expr_ty->get_kind () == TyTy::TypeKind::INFER
&& (((TyTy::InferType *) negated_expr_ty)->get_infer_kind ()
== TyTy::InferType::FLOAT));
if (!valid)
{
rust_error_at (expr.get_locus (), "cannot apply unary - to %s",
negated_expr_ty->as_string ().c_str ());
return;
}
}
break;
case NegationOperator::NOT: {
bool valid
= (negated_expr_ty->get_kind () == TyTy::TypeKind::BOOL)
|| (negated_expr_ty->get_kind () == TyTy::TypeKind::INT)
|| (negated_expr_ty->get_kind () == TyTy::TypeKind::UINT)
|| (negated_expr_ty->get_kind () == TyTy::TypeKind::INFER
&& (((TyTy::InferType *) negated_expr_ty)->get_infer_kind ()
== TyTy::InferType::INTEGRAL));
if (!valid)
{
rust_error_at (expr.get_locus (), "cannot apply unary ! to %s",
negated_expr_ty->as_string ().c_str ());
return;
}
}
break;
}
infered = negated_expr_ty->clone ();
infered->append_reference (negated_expr_ty->get_ref ());
}
void visit (HIR::IfExpr &expr) override
{
TypeCheckExpr::Resolve (expr.get_if_condition (), false);
TypeCheckExpr::Resolve (expr.get_if_block (), inside_loop);
infered = new TyTy::TupleType (expr.get_mappings ().get_hirid ());
}
void visit (HIR::IfExprConseqElse &expr) override
{
TypeCheckExpr::Resolve (expr.get_if_condition (), false);
auto if_blk_resolved
= TypeCheckExpr::Resolve (expr.get_if_block (), inside_loop);
auto else_blk_resolved
= TypeCheckExpr::Resolve (expr.get_else_block (), inside_loop);
if (if_blk_resolved->get_kind () == TyTy::NEVER)
infered = else_blk_resolved;
else if (else_blk_resolved->get_kind () == TyTy::NEVER)
infered = if_blk_resolved;
else
infered = if_blk_resolved->unify (else_blk_resolved);
}
void visit (HIR::IfExprConseqIf &expr) override
{
TypeCheckExpr::Resolve (expr.get_if_condition (), false);
auto if_blk_resolved
= TypeCheckExpr::Resolve (expr.get_if_block (), inside_loop);
auto else_blk_resolved
= TypeCheckExpr::Resolve (expr.get_conseq_if_expr (), inside_loop);
if (if_blk_resolved->get_kind () == TyTy::NEVER)
infered = else_blk_resolved;
else if (else_blk_resolved->get_kind () == TyTy::NEVER)
infered = if_blk_resolved;
else
infered = if_blk_resolved->unify (else_blk_resolved);
}
void visit (HIR::BlockExpr &expr) override;
void visit (HIR::ArrayIndexExpr &expr) override
{
TyTy::BaseType *size_ty;
if (!context->lookup_builtin ("usize", &size_ty))
{
rust_error_at (
expr.get_locus (),
"Failure looking up size type for index in ArrayIndexExpr");
return;
}
auto resolved_index_expr
= size_ty->unify (TypeCheckExpr::Resolve (expr.get_index_expr (), false));
if (resolved_index_expr == nullptr)
{
rust_error_at (expr.get_index_expr ()->get_locus_slow (),
"Type Resolver failure in Index for ArrayIndexExpr");
return;
}
context->insert_type (expr.get_index_expr ()->get_mappings (),
resolved_index_expr);
// resolve the array reference
expr.get_array_expr ()->accept_vis (*this);
if (infered == nullptr)
{
rust_error_at (expr.get_index_expr ()->get_locus_slow (),
"failed to resolve array reference expression");
return;
}
else if (infered->get_kind () != TyTy::TypeKind::ARRAY)
{
rust_error_at (expr.get_index_expr ()->get_locus_slow (),
"expected an ArrayType got [%s]",
infered->as_string ().c_str ());
infered = nullptr;
return;
}
TyTy::ArrayType *array_type = static_cast<TyTy::ArrayType *> (infered);
infered = array_type->get_element_type ()->clone ();
}
void visit (HIR::ArrayExpr &expr) override
{
HIR::ArrayElems *elements = expr.get_internal_elements ();
root_array_expr_locus = expr.get_locus ();
elements->accept_vis (*this);
if (infered_array_elems == nullptr)
return;
if (folded_array_capacity == nullptr)
return;
infered
= new TyTy::ArrayType (expr.get_mappings ().get_hirid (),
folded_array_capacity,
TyTy::TyVar (infered_array_elems->get_ref ()));
}
void visit (HIR::ArrayElemsValues &elems) override
{
std::vector<TyTy::BaseType *> types;
elems.iterate ([&] (HIR::Expr *e) mutable -> bool {
types.push_back (TypeCheckExpr::Resolve (e, false));
return true;
});
infered_array_elems
= TyTy::TyVar::get_implicit_infer_var (root_array_expr_locus).get_tyty ();
for (auto &type : types)
{
infered_array_elems = infered_array_elems->unify (type);
}
for (auto &elem : types)
{
infered_array_elems->append_reference (elem->get_ref ());
}
auto crate_num = mappings->get_current_crate ();
Analysis::NodeMapping mapping (crate_num, UNKNOWN_NODEID,
mappings->get_next_hir_id (crate_num),
UNKNOWN_LOCAL_DEFID);
std::string capacity_str = std::to_string (elems.get_num_elements ());
HIR::LiteralExpr implicit_literal_capacity (
mapping, capacity_str, HIR::Literal::LitType::INT,
PrimitiveCoreType::CORETYPE_USIZE, Location ());
// mark the type for this implicit node
context->insert_type (mapping, new TyTy::USizeType (mapping.get_hirid ()));
folded_array_capacity
= ConstFold::ConstFoldExpr::fold (&implicit_literal_capacity);
}
void visit (HIR::ArrayElemsCopied &elems) override
{
auto capacity_type
= TypeCheckExpr::Resolve (elems.get_num_copies_expr (), false);
TyTy::USizeType *expected_ty = new TyTy::USizeType (
elems.get_num_copies_expr ()->get_mappings ().get_hirid ());
context->insert_type (elems.get_num_copies_expr ()->get_mappings (),
expected_ty);
auto unified = expected_ty->unify (capacity_type);
if (unified->get_kind () == TyTy::TypeKind::ERROR)
return;
folded_array_capacity
= ConstFold::ConstFoldExpr::fold (elems.get_num_copies_expr ());
infered_array_elems
= TypeCheckExpr::Resolve (elems.get_elem_to_copy (), false);
}
void visit (HIR::StructExprStructFields &struct_expr) override
{
infered = TypeCheckStructExpr::Resolve (&struct_expr);
}
void visit (HIR::GroupedExpr &expr) override
{
infered = TypeCheckExpr::Resolve (expr.get_expr_in_parens ().get (), false);
}
void visit (HIR::FieldAccessExpr &expr) override
{
auto struct_base
= TypeCheckExpr::Resolve (expr.get_receiver_expr ().get (), false);
bool is_valid_type = struct_base->get_kind () == TyTy::TypeKind::ADT;
if (!is_valid_type)
{
rust_error_at (expr.get_locus (),
"expected algebraic data type got: [%s]",
struct_base->as_string ().c_str ());
return;
}
TyTy::ADTType *adt = static_cast<TyTy::ADTType *> (struct_base);
auto resolved = adt->get_field (expr.get_field_name ());
if (resolved == nullptr)
{
rust_error_at (expr.get_locus (), "unknown field [%s] for type [%s]",
expr.get_field_name ().c_str (),
adt->as_string ().c_str ());
return;
}
infered = resolved->get_field_type ();
}
void visit (HIR::PathInExpression &expr) override
{
// resolve root_segment
TyTy::BaseType *tyseg = resolve_root_path (expr);
if (tyseg->get_kind () == TyTy::TypeKind::ERROR)
return;
else if (expr.get_num_segments () == 1)
{
Location locus = expr.get_segments ().back ().get_locus ();
bool is_big_self
= expr.get_segments ().front ().get_segment ().as_string ().compare (
"Self")
== 0;
if (!is_big_self && tyseg->needs_generic_substitutions ())
{
tyseg = SubstMapper::InferSubst (tyseg, locus);
}
infered = tyseg;
return;
}
TyTy::BaseType *prev_segment = tyseg;
NodeId resolved_node_id = UNKNOWN_NODEID;
for (size_t i = 1; i < expr.get_num_segments (); i++)
{
HIR::PathExprSegment &seg = expr.get_segments ().at (i);
// probe the path
auto candidates = PathProbeType::Probe (tyseg, seg.get_segment ());
if (candidates.size () == 0)
{
rust_error_at (seg.get_locus (), "failed to resolve path segment");
return;
}
else if (candidates.size () > 1)
{
ReportMultipleCandidateError::Report (candidates,
seg.get_segment (),
seg.get_locus ());
return;
}
auto candidate = candidates.at (0);
prev_segment = tyseg;
tyseg = candidate.ty;
resolved_node_id
= candidate.impl_item->get_impl_mappings ().get_nodeid ();
if (seg.has_generic_args ())
{
if (!tyseg->can_substitute ())
{
rust_error_at (expr.get_locus (),
"substitutions not supported for %s",
tyseg->as_string ().c_str ());
return;
}
tyseg = SubstMapper::Resolve (tyseg, expr.get_locus (),
&seg.get_generic_args ());
if (tyseg->get_kind () == TyTy::TypeKind::ERROR)
return;
}
}
if (tyseg->needs_generic_substitutions ())
{
Location locus = expr.get_segments ().back ().get_locus ();
if (!prev_segment->needs_generic_substitutions ())
{
auto used_args_in_prev_segment
= GetUsedSubstArgs::From (prev_segment);
tyseg
= SubstMapperInternal::Resolve (tyseg, used_args_in_prev_segment);
}
else
{
tyseg = SubstMapper::InferSubst (tyseg, locus);
}
if (tyseg->get_kind () == TyTy::TypeKind::ERROR)
return;
}
rust_assert (resolved_node_id != UNKNOWN_NODEID);
// lookup if the name resolver was able to canonically resolve this or not
NodeId path_resolved_id = UNKNOWN_NODEID;
if (resolver->lookup_resolved_name (expr.get_mappings ().get_nodeid (),
&path_resolved_id))
{
rust_assert (path_resolved_id == resolved_node_id);
}
// check the type scope
else if (resolver->lookup_resolved_type (expr.get_mappings ().get_nodeid (),
&path_resolved_id))
{
rust_assert (path_resolved_id == resolved_node_id);
}
else
{
resolver->insert_resolved_name (expr.get_mappings ().get_nodeid (),
resolved_node_id);
}
infered = tyseg;
}
void visit (HIR::LoopExpr &expr) override
{
context->push_new_loop_context (expr.get_mappings ().get_hirid ());
TyTy::BaseType *block_expr
= TypeCheckExpr::Resolve (expr.get_loop_block ().get (), true);
if (!block_expr->is_unit ())
{
rust_error_at (expr.get_loop_block ()->get_locus_slow (),
"expected () got %s", block_expr->as_string ().c_str ());
return;
}
TyTy::BaseType *loop_context_type = context->pop_loop_context ();
bool loop_context_type_infered
= (loop_context_type->get_kind () != TyTy::TypeKind::INFER)
|| ((loop_context_type->get_kind () == TyTy::TypeKind::INFER)
&& (((TyTy::InferType *) loop_context_type)->get_infer_kind ()
!= TyTy::InferType::GENERAL));
infered = loop_context_type_infered
? loop_context_type
: new TyTy::TupleType (expr.get_mappings ().get_hirid ());
}
void visit (HIR::WhileLoopExpr &expr) override