[gcc r15-8795] gccrs: enum type layout needs to respect the enum repr type

[Arthur Cohen via Gcc-cvs]

https://gcc.gnu.org/g:980ae7ad44397cdebf4e115546fff0b42493a247

commit r15-8795-g980ae7ad44397cdebf4e115546fff0b42493a247
Author: Philip Herron <herron.phi...@googlemail.com>
Date:   Tue Feb 11 17:51:22 2025 +0000

    gccrs: enum type layout needs to respect the enum repr type
    
    Addresses Rust-GCC#3352
    
    gcc/rust/ChangeLog:
    
            * backend/rust-compile-type.cc 
(TyTyResolveCompile::get_implicit_enumeral_node_type):
            use repr
            (TyTyResolveCompile::visit): update prototype
            * backend/rust-compile-type.h: likewise
    
    Signed-off-by: Philip Herron <herron.phi...@googlemail.com>

Diff:
---
 gcc/rust/backend/rust-compile-type.cc | 16 ++++------------
 gcc/rust/backend/rust-compile-type.h  |  3 +--
 2 files changed, 5 insertions(+), 14 deletions(-)

diff --git a/gcc/rust/backend/rust-compile-type.cc 
b/gcc/rust/backend/rust-compile-type.cc
index 85e786583353..74368a29f494 100644
--- a/gcc/rust/backend/rust-compile-type.cc
+++ b/gcc/rust/backend/rust-compile-type.cc
@@ -55,7 +55,7 @@ TyTyResolveCompile::compile (Context *ctx, const 
TyTy::BaseType *ty,
 // see: gcc/c/c-decl.cc:8230-8241
 // 
https://github.com/Rust-GCC/gccrs/blob/0024bc2f028369b871a65ceb11b2fddfb0f9c3aa/gcc/c/c-decl.c#L8229-L8241
 tree
-TyTyResolveCompile::get_implicit_enumeral_node_type ()
+TyTyResolveCompile::get_implicit_enumeral_node_type (TyTy::BaseType *repr)
 {
   // static tree enum_node = NULL_TREE;
   // if (enum_node == NULL_TREE)
@@ -77,15 +77,7 @@ TyTyResolveCompile::get_implicit_enumeral_node_type ()
   //   }
   // return enum_node;
 
-  static tree enum_node = NULL_TREE;
-  if (enum_node == NULL_TREE)
-    {
-      // equivalent to isize
-      enum_node = Backend::named_type (
-       "enumeral", Backend::integer_type (false, Backend::get_pointer_size ()),
-       BUILTINS_LOCATION);
-    }
-  return enum_node;
+  return compile (ctx, repr);
 }
 
 tree
@@ -384,8 +376,8 @@ TyTyResolveCompile::visit (const TyTy::ADTType &type)
        = Backend::named_type ("payload", variants_union, locus);
 
       // create the overall struct
-      tree enumeral_type
-       = TyTyResolveCompile::get_implicit_enumeral_node_type ();
+      tree enumeral_type = TyTyResolveCompile::get_implicit_enumeral_node_type 
(
+       type.get_repr_options ().repr);
       Backend::typed_identifier discrim (RUST_ENUM_DISR_FIELD_NAME,
                                         enumeral_type, locus);
       Backend::typed_identifier variants_union_field ("payload",
diff --git a/gcc/rust/backend/rust-compile-type.h 
b/gcc/rust/backend/rust-compile-type.h
index e01ca430d454..398d7f8bda9b 100644
--- a/gcc/rust/backend/rust-compile-type.h
+++ b/gcc/rust/backend/rust-compile-type.h
@@ -30,8 +30,6 @@ public:
   static tree compile (Context *ctx, const TyTy::BaseType *ty,
                       bool trait_object_mode = false);
 
-  static tree get_implicit_enumeral_node_type ();
-
   static tree get_unit_type ();
 
   void visit (const TyTy::InferType &) override;
@@ -66,6 +64,7 @@ protected:
   tree create_slice_type_record (const TyTy::SliceType &type);
   tree create_str_type_record (const TyTy::StrType &type);
   tree create_dyn_obj_record (const TyTy::DynamicObjectType &type);
+  tree get_implicit_enumeral_node_type (TyTy::BaseType *repr);
 
 private:
   TyTyResolveCompile (Context *ctx, bool trait_object_mode);