gccrs: improve name mangling hash

We can endup with duplicate symbol names for different intrinsics with our
current hash setup. This adds in the mappings and extra info to improve
hash uniqueness.

Addresses Rust-GCC#1895

gcc/rust/ChangeLog:

	* backend/rust-compile-intrinsic.cc (check_for_cached_intrinsic):
	simplify this cached intrinsic check
	* backend/rust-mangle.cc (legacy_mangle_item): use new interface
	* typecheck/rust-tyty.h: new managle helper

Signed-off-by: Philip Herron <[email protected]>

Author: philberty

gcc/rust/backend/rust-compile-intrinsic.cc

@@ -242,17 +242,12 @@ Intrinsics::compile (TyTy::FnType *fntype)
 static bool
 check_for_cached_intrinsic (Context *ctx, TyTy::FnType *fntype, tree *lookup)
 {
+  const Resolver::CanonicalPath &canonical_path = fntype->get_ident ().path;
+  std::string asm_name = ctx->mangle_item (fntype, canonical_path);
   if (ctx->lookup_function_decl (fntype->get_ty_ref (), lookup,
-				 fntype->get_id (), fntype))
+				 fntype->get_id (), fntype, asm_name))
     {
-      // Has this been added to the list? Then it must be finished
-      if (ctx->function_completed (*lookup))
-	{
-	  tree dummy = NULL_TREE;
-	  if (!ctx->lookup_function_decl (fntype->get_ty_ref (), &dummy))
-	    ctx->insert_function_decl (fntype, *lookup);
-	  return true;
-	}
+      return true;
     }
 
   return false;

gcc/rust/backend/rust-mangle.cc

@@ -282,7 +282,7 @@ static std::string
 legacy_mangle_item (const TyTy::BaseType *ty,
 		    const Resolver::CanonicalPath &path)
 {
-  const std::string hash = legacy_hash (ty->as_string ());
+  const std::string hash = legacy_hash (ty->mangle_string ());
   const std::string hash_sig = legacy_mangle_name (hash);
 
   return kMangledSymbolPrefix + legacy_mangle_canonical_path (path) + hash_sig

gcc/rust/typecheck/rust-tyty.h

@@ -158,6 +158,12 @@ class BaseType : public TypeBoundsMappings
   bool has_subsititions_defined () const;
   bool needs_generic_substitutions () const;
 
+  std::string mangle_string () const
+  {
+    return TypeKindFormat::to_string (get_kind ()) + ":" + as_string () + ":"
+	   + mappings_str () + ":" + bounds_as_string ();
+  }
+
   /* Returns a pointer to a clone of this. The caller is responsible for
    * releasing the memory of the returned ty. */
   virtual BaseType *clone () const = 0;