[gcc/devel/rust/master] Refactor helper from TypeCheckResolveToplevel

[Thomas Schwinge]

https://gcc.gnu.org/g:630ef83dfc9a62ef0b0b822b34bfd7e3389b909d

commit 630ef83dfc9a62ef0b0b822b34bfd7e3389b909d
Author: Philip Herron <philip.herron@embecosm.com>
Date:   Wed Aug 10 14:47:44 2022 +0100

    Refactor helper from TypeCheckResolveToplevel
    
    The reason we cannot type-resolve forward declared items is due to the
    fact our type-resolver runs in a toplevel pass trying to type resolve as
    best it can but when we hit structs for example which contain types that
    are forward declared they need to be resolved in a query based manar. We
    have all the missing pieces to do this now and this means we need to get
    rid of this toplevel pass as the starting point.
    
    Addresses #1455

Diff:
---
 gcc/rust/typecheck/rust-hir-type-check-base.cc     | 46 ++++++++++++++++++++++
 gcc/rust/typecheck/rust-hir-type-check-base.h      |  4 ++
 gcc/rust/typecheck/rust-hir-type-check-toplevel.cc | 44 ---------------------
 gcc/rust/typecheck/rust-hir-type-check-toplevel.h  |  4 --
 4 files changed, 50 insertions(+), 48 deletions(-)

diff --git a/gcc/rust/typecheck/rust-hir-type-check-base.cc b/gcc/rust/typecheck/rust-hir-type-check-base.cc
index c50199847b7..e263056a82c 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-base.cc
+++ b/gcc/rust/typecheck/rust-hir-type-check-base.cc
@@ -17,6 +17,8 @@
 // <http://www.gnu.org/licenses/>.
 
 #include "rust-hir-type-check-base.h"
+#include "rust-hir-type-check-type.h"
+#include "rust-hir-type-check-expr.h"
 #include "rust-coercion.h"
 
 namespace Rust {
@@ -349,5 +351,49 @@ TypeCheckBase::coercion_site (HirId id, TyTy::BaseType *expected,
   return expected->coerce (expr);
 }
 
+void
+TypeCheckBase::resolve_generic_params (
+  const std::vector<std::unique_ptr<HIR::GenericParam>> &generic_params,
+  std::vector<TyTy::SubstitutionParamMapping> &substitutions)
+{
+  for (auto &generic_param : generic_params)
+    {
+      switch (generic_param.get ()->get_kind ())
+	{
+	case HIR::GenericParam::GenericKind::LIFETIME:
+	  // FIXME: Skipping Lifetime completely until better
+	  // handling.
+	  break;
+	  case HIR::GenericParam::GenericKind::CONST: {
+	    auto param
+	      = static_cast<HIR::ConstGenericParam *> (generic_param.get ());
+	    auto specified_type
+	      = TypeCheckType::Resolve (param->get_type ().get ());
+
+	    if (param->has_default_expression ())
+	      {
+		auto expr_type = TypeCheckExpr::Resolve (
+		  param->get_default_expression ().get ());
+		specified_type->coerce (expr_type);
+	      }
+
+	    context->insert_type (generic_param->get_mappings (),
+				  specified_type);
+	  }
+	  break;
+
+	  case HIR::GenericParam::GenericKind::TYPE: {
+	    auto param_type
+	      = TypeResolveGenericParam::Resolve (generic_param.get ());
+	    context->insert_type (generic_param->get_mappings (), param_type);
+
+	    substitutions.push_back (TyTy::SubstitutionParamMapping (
+	      static_cast<HIR::TypeParam &> (*generic_param), param_type));
+	  }
+	  break;
+	}
+    }
+}
+
 } // namespace Resolver
 } // namespace Rust
diff --git a/gcc/rust/typecheck/rust-hir-type-check-base.h b/gcc/rust/typecheck/rust-hir-type-check-base.h
index 4078697c927..b6f4b636789 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-base.h
+++ b/gcc/rust/typecheck/rust-hir-type-check-base.h
@@ -64,6 +64,10 @@ protected:
   TyTy::ADTType::ReprOptions parse_repr_options (const AST::AttrVec &attrs,
 						 Location locus);
 
+  void resolve_generic_params (
+    const std::vector<std::unique_ptr<HIR::GenericParam>> &generic_params,
+    std::vector<TyTy::SubstitutionParamMapping> &substitutions);
+
   Analysis::Mappings *mappings;
   Resolver *resolver;
   TypeCheckContext *context;
diff --git a/gcc/rust/typecheck/rust-hir-type-check-toplevel.cc b/gcc/rust/typecheck/rust-hir-type-check-toplevel.cc
index 69377e28d22..d5270c9acbb 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-toplevel.cc
+++ b/gcc/rust/typecheck/rust-hir-type-check-toplevel.cc
@@ -28,50 +28,6 @@ TypeCheckTopLevel::Resolve (HIR::Item *item)
   item->accept_vis (resolver);
 }
 
-void
-TypeCheckTopLevel::resolve_generic_params (
-  const std::vector<std::unique_ptr<HIR::GenericParam>> &generic_params,
-  std::vector<TyTy::SubstitutionParamMapping> &substitutions)
-{
-  for (auto &generic_param : generic_params)
-    {
-      switch (generic_param.get ()->get_kind ())
-	{
-	case HIR::GenericParam::GenericKind::LIFETIME:
-	  // FIXME: Skipping Lifetime completely until better
-	  // handling.
-	  break;
-	  case HIR::GenericParam::GenericKind::CONST: {
-	    auto param
-	      = static_cast<HIR::ConstGenericParam *> (generic_param.get ());
-	    auto specified_type
-	      = TypeCheckType::Resolve (param->get_type ().get ());
-
-	    if (param->has_default_expression ())
-	      {
-		auto expr_type = TypeCheckExpr::Resolve (
-		  param->get_default_expression ().get ());
-		specified_type->coerce (expr_type);
-	      }
-
-	    context->insert_type (generic_param->get_mappings (),
-				  specified_type);
-	  }
-	  break;
-
-	  case HIR::GenericParam::GenericKind::TYPE: {
-	    auto param_type
-	      = TypeResolveGenericParam::Resolve (generic_param.get ());
-	    context->insert_type (generic_param->get_mappings (), param_type);
-
-	    substitutions.push_back (TyTy::SubstitutionParamMapping (
-	      static_cast<HIR::TypeParam &> (*generic_param), param_type));
-	  }
-	  break;
-	}
-    }
-}
-
 void
 TypeCheckTopLevel::visit (HIR::TypeAlias &alias)
 {
diff --git a/gcc/rust/typecheck/rust-hir-type-check-toplevel.h b/gcc/rust/typecheck/rust-hir-type-check-toplevel.h
index fdc13f7684d..d2785b15e54 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-toplevel.h
+++ b/gcc/rust/typecheck/rust-hir-type-check-toplevel.h
@@ -51,10 +51,6 @@ public:
 
 private:
   TypeCheckTopLevel () : TypeCheckBase () {}
-
-  void resolve_generic_params (
-    const std::vector<std::unique_ptr<HIR::GenericParam>> &generic_params,
-    std::vector<TyTy::SubstitutionParamMapping> &substitutions);
 };
 
 } // namespace Resolver