[gcc r14-7301] gccrs: refactor unify commit as a static function from unify code

[Arthur Cohen]

https://gcc.gnu.org/g:00b8eff7bda39ebd7ca9e278c33736f7f9e09994

commit r14-7301-g00b8eff7bda39ebd7ca9e278c33736f7f9e09994
Author: Philip Herron <herron.philip@googlemail.com>
Date:   Sun Feb 26 18:30:49 2023 +0000

    gccrs: refactor unify commit as a static function from unify code
    
    Signed-off-by: Philip Herron <herron.philip@googlemail.com>
    
    gcc/rust/ChangeLog:
    
            * typecheck/rust-unify.cc (UnifyRules::Resolve): refactor
            (UnifyRules::commit): refactor
            * typecheck/rust-unify.h: likewise

Diff:
---
 gcc/rust/typecheck/rust-unify.cc | 27 +++++++++++++++++----------
 gcc/rust/typecheck/rust-unify.h  |  5 ++++-
 2 files changed, 21 insertions(+), 11 deletions(-)

diff --git a/gcc/rust/typecheck/rust-unify.cc b/gcc/rust/typecheck/rust-unify.cc
index 69ab2a96543..d2d8ef5ce64 100644
--- a/gcc/rust/typecheck/rust-unify.cc
+++ b/gcc/rust/typecheck/rust-unify.cc
@@ -36,7 +36,7 @@ UnifyRules::Resolve (TyTy::TyWithLocation lhs, TyTy::TyWithLocation rhs,
   TyTy::BaseType *result = r.go ();
 
   if (r.commit_flag)
-    r.commit (result);
+    UnifyRules::commit (lhs.get_ty (), rhs.get_ty (), result);
 
   bool failed = result->get_kind () == TyTy::TypeKind::ERROR;
   if (failed && r.emit_error)
@@ -58,19 +58,26 @@ UnifyRules::get_other ()
 }
 
 void
-UnifyRules::commit (TyTy::BaseType *resolved)
+UnifyRules::commit (TyTy::BaseType *base, TyTy::BaseType *other,
+		    TyTy::BaseType *resolved)
 {
-  resolved->append_reference (get_base ()->get_ref ());
-  resolved->append_reference (get_other ()->get_ref ());
-  for (auto ref : get_base ()->get_combined_refs ())
+  TypeCheckContext &context = *TypeCheckContext::get ();
+  Analysis::Mappings &mappings = *Analysis::Mappings::get ();
+
+  TyTy::BaseType *b = base->destructure ();
+  TyTy::BaseType *o = other->destructure ();
+
+  resolved->append_reference (b->get_ref ());
+  resolved->append_reference (o->get_ref ());
+  for (auto ref : b->get_combined_refs ())
     resolved->append_reference (ref);
-  for (auto ref : get_other ()->get_combined_refs ())
+  for (auto ref : o->get_combined_refs ())
     resolved->append_reference (ref);
 
-  get_other ()->append_reference (resolved->get_ref ());
-  get_other ()->append_reference (get_base ()->get_ref ());
-  get_base ()->append_reference (resolved->get_ref ());
-  get_base ()->append_reference (get_other ()->get_ref ());
+  o->append_reference (resolved->get_ref ());
+  o->append_reference (b->get_ref ());
+  b->append_reference (resolved->get_ref ());
+  b->append_reference (o->get_ref ());
 
   bool result_resolved = resolved->get_kind () != TyTy::TypeKind::INFER;
   bool result_is_infer_var = resolved->get_kind () == TyTy::TypeKind::INFER;
diff --git a/gcc/rust/typecheck/rust-unify.h b/gcc/rust/typecheck/rust-unify.h
index 65f1ffebc56..dcd15839d5b 100644
--- a/gcc/rust/typecheck/rust-unify.h
+++ b/gcc/rust/typecheck/rust-unify.h
@@ -32,6 +32,9 @@ public:
 				  TyTy::TyWithLocation rhs, Location locus,
 				  bool commit_flag, bool emit_error);
 
+  static void commit (TyTy::BaseType *base, TyTy::BaseType *other,
+		      TyTy::BaseType *resolved);
+
 protected:
   TyTy::BaseType *expect_inference_variable (TyTy::InferType *ltype,
 					     TyTy::BaseType *rtype);
@@ -69,7 +72,7 @@ private:
 	      Location locus, bool commit_flag, bool emit_error);
 
   void emit_type_mismatch () const;
-  void commit (TyTy::BaseType *resolved);
+
   TyTy::BaseType *go ();
 
   TyTy::BaseType *get_base ();