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[Ada] Crash in interface derivation with null primitive
- From: Pierre-Marie de Rodat <derodat at adacore dot com>
- To: gcc-patches at gcc dot gnu dot org
- Cc: Javier Miranda <miranda at adacore dot com>
- Date: Mon, 8 Jul 2019 04:18:57 -0400
- Subject: [Ada] Crash in interface derivation with null primitive
The frontend crashes processing the derivation of a tagged type whose
ultimate ancestor is an interface type I1 that has a null primitive,
implements another interface I2 derived from I2, and does not override
the null primitive.
Tested on x86_64-pc-linux-gnu, committed on trunk
2019-07-08 Javier Miranda <miranda@adacore.com>
gcc/ada/
* exp_disp.adb (Register_Primitive): When registering a
primitive in the secondary dispatch table, handle primitive
inherited through several levels of type derivation (required to
properly handle inherited 'null' primitive).
gcc/testsuite/
* gnat.dg/interface9.adb, gnat.dg/interface9_root-child.ads,
gnat.dg/interface9_root.ads: New testcase.
--- gcc/ada/exp_disp.adb
+++ gcc/ada/exp_disp.adb
@@ -7637,7 +7637,7 @@ package body Exp_Disp is
Unchecked_Convert_To (RTE (RE_Prim_Ptr),
Make_Attribute_Reference (Loc,
Prefix =>
- New_Occurrence_Of (Alias (Prim), Loc),
+ New_Occurrence_Of (Ultimate_Alias (Prim), Loc),
Attribute_Name => Name_Unrestricted_Access))));
end if;
--- /dev/null
new file mode 100644
+++ gcc/testsuite/gnat.dg/interface9.adb
@@ -0,0 +1,10 @@
+-- { dg-do compile }
+
+with Interface9_Root.Child;
+procedure Interface9 is
+ package R is new Interface9_Root (Real => Float);
+ package RC is new R.Child;
+
+begin
+ null;
+end Interface9;
--- /dev/null
new file mode 100644
+++ gcc/testsuite/gnat.dg/interface9_root-child.ads
@@ -0,0 +1,7 @@
+generic
+package Interface9_Root.Child is
+ type Base_Type is abstract new Base_Interface with null record;
+
+ type Derived_Type is abstract new Base_Type and Derived_Interface
+ with null record; -- Test
+end Interface9_Root.Child;
--- /dev/null
new file mode 100644
+++ gcc/testsuite/gnat.dg/interface9_root.ads
@@ -0,0 +1,10 @@
+generic
+ type Real is digits <>;
+package Interface9_Root is
+ type Base_Interface is limited interface;
+
+ procedure Primitive1 (B : in out Base_Interface) is abstract;
+ procedure Primitive2 (B : in out Base_Interface) is null;
+
+ type Derived_Interface is limited interface and Base_Interface;
+end Interface9_Root;