[gcc r12-7307] d: Remove handling of deleting GC allocated classes.

[Iain Buclaw]

https://gcc.gnu.org/g:1d98337c6bebf41743dd3d1cc36222aa30e8f382

commit r12-7307-g1d98337c6bebf41743dd3d1cc36222aa30e8f382
Author: Iain Buclaw <ibuclaw@gdcproject.org>
Date:   Mon Feb 21 00:06:16 2022 +0100

    d: Remove handling of deleting GC allocated classes.
    
    Now that the `delete' keyword has been removed from the front-end, only
    compiler-generated uses of DeleteExp reach the code generator via the
    auto-destruction of `scope class' variables.
    
    The run-time library helpers that previously were used to delete GC
    class objects can now be removed from the compiler.
    
    gcc/d/ChangeLog:
    
            * expr.cc (ExprVisitor::visit (DeleteExp *)): Remove handling of
            deleting GC allocated classes.
            * runtime.def (DELCLASS): Remove.
            (DELINTERFACE): Remove.

Diff:
---
 gcc/d/expr.cc     | 24 ++++++------------------
 gcc/d/runtime.def |  6 +-----
 2 files changed, 7 insertions(+), 23 deletions(-)

diff --git a/gcc/d/expr.cc b/gcc/d/expr.cc
index d5e4df7f563..2a7fb690862 100644
--- a/gcc/d/expr.cc
+++ b/gcc/d/expr.cc
@@ -1438,28 +1438,16 @@ public:
       {
 	/* For class object references, if there is a destructor for that class,
 	   the destructor is called for the object instance.  */
-	libcall_fn libcall;
+	gcc_assert (e->e1->op == EXP::variable);
 
-	if (e->e1->op == EXP::variable)
-	  {
-	    VarDeclaration *v = e->e1->isVarExp ()->var->isVarDeclaration ();
-	    if (v && v->onstack)
-	      {
-		libcall = tb1->isClassHandle ()->isInterfaceDeclaration ()
-		  ? LIBCALL_CALLINTERFACEFINALIZER : LIBCALL_CALLFINALIZER;
+	VarDeclaration *v = e->e1->isVarExp ()->var->isVarDeclaration ();
+	gcc_assert (v && v->onstack);
 
-		this->result_ = build_libcall (libcall, Type::tvoid, 1, t1);
-		return;
-	      }
-	  }
+	libcall_fn libcall = tb1->isClassHandle ()->isInterfaceDeclaration ()
+	  ? LIBCALL_CALLINTERFACEFINALIZER : LIBCALL_CALLFINALIZER;
 
-	/* Otherwise, the garbage collector is called to immediately free the
-	   memory allocated for the class instance.  */
-	libcall = tb1->isClassHandle ()->isInterfaceDeclaration ()
-	  ? LIBCALL_DELINTERFACE : LIBCALL_DELCLASS;
-
-	t1 = build_address (t1);
 	this->result_ = build_libcall (libcall, Type::tvoid, 1, t1);
+	return;
       }
     else
       {
diff --git a/gcc/d/runtime.def b/gcc/d/runtime.def
index acb610f71f0..534f8661b3e 100644
--- a/gcc/d/runtime.def
+++ b/gcc/d/runtime.def
@@ -63,11 +63,7 @@ DEF_D_RUNTIME (ARRAYBOUNDS_INDEXP, "_d_arraybounds_indexp", RT(VOID),
 DEF_D_RUNTIME (NEWCLASS, "_d_newclass", RT(OBJECT), P1(CONST_CLASSINFO), 0)
 DEF_D_RUNTIME (NEWTHROW, "_d_newThrowable", RT(OBJECT), P1(CONST_CLASSINFO), 0)
 
-/* Used when calling delete on a class or interface.  */
-DEF_D_RUNTIME (DELCLASS, "_d_delclass", RT(VOID), P1(VOIDPTR), 0)
-DEF_D_RUNTIME (DELINTERFACE, "_d_delinterface", RT(VOID), P1(VOIDPTR), 0)
-
-/* Same as deleting a class, but used for stack-allocated classes.  */
+/* Used when calling delete on a stack-allocated class or interface.  */
 DEF_D_RUNTIME (CALLFINALIZER, "_d_callfinalizer", RT(VOID), P1(VOIDPTR), 0)
 DEF_D_RUNTIME (CALLINTERFACEFINALIZER, "_d_callinterfacefinalizer", RT(VOID),
 	       P1(VOIDPTR), 0)