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[Ada] Fix ICE on renaming with discriminated tagged type

Message ID 201207031049.21799.ebotcazou@adacore.com
State New
Headers show

Commit Message

Eric Botcazou July 3, 2012, 8:49 a.m. UTC 
This is a regression present on the mainline and 4.7 branch.  The compiler 
aborts on the renaming of an object with a derived discriminated tagged type 
converted to the parent type, if the parent type is itself derived from a root 
discriminated tagged type and the renaming is later used as a prefix in the 
selection of a component inherited from the root type.

Tested on i586-suse-linux, applied on mainline and 4.7 branch.


2012-07-03  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/utils2.c (build_simple_component_ref): Do not look
	through an extension if the type contains a placeholder.


2012-07-03  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/discr37.ad[sb]: New test.
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Patch

Index: gcc-interface/utils2.c
===================================================================
--- gcc-interface/utils2.c	(revision 189034)
+++ gcc-interface/utils2.c	(working copy)
@@ -1912,10 +1912,12 @@  build_simple_component_ref (tree record_
 	  break;
 
       /* Next, see if we're looking for an inherited component in an extension.
-	 If so, look thru the extension directly.  */
+	 If so, look thru the extension directly, but not if the type contains
+	 a placeholder, as it might be needed for a later substitution.  */
       if (!new_field
 	  && TREE_CODE (record_variable) == VIEW_CONVERT_EXPR
 	  && TYPE_ALIGN_OK (record_type)
+	  && !type_contains_placeholder_p (record_type)
 	  && TREE_CODE (TREE_TYPE (TREE_OPERAND (record_variable, 0)))
 	     == RECORD_TYPE
 	  && TYPE_ALIGN_OK (TREE_TYPE (TREE_OPERAND (record_variable, 0))))