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re PR c++/16129 (g++.old-deja/g++.eh/catch[35679]*.C)

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PR wrong-code/16129
	* alias.c (get_alias_set): Adjust setting of
	DECL_POINTER_ALIAS_SET for pointers to aggregates.

From-SVN: r83674
This commit is contained in:
Mark Mitchell 2004-06-25 19:17:49 +00:00 committed by Mark Mitchell
parent ed397c43b4
commit 4f430fb914
2 changed files with 20 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2004-06-25 Mark Mitchell <mark@codesourcery.com>
PR wrong-code/16129
* alias.c (get_alias_set): Adjust setting of
DECL_POINTER_ALIAS_SET for pointers to aggregates.
2004-06-24 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* tree-inline.c (remap_type): Arrange to have just one pointer type

15
gcc/alias.c
View File

@ -507,6 +507,8 @@ get_alias_set (tree t)
/* If we haven't computed the actual alias set, do it now. */
if (DECL_POINTER_ALIAS_SET (decl) == -2)
{
tree pointed_to_type = TREE_TYPE (TREE_TYPE (decl));
/* No two restricted pointers can point at the same thing.
However, a restricted pointer can point at the same thing
as an unrestricted pointer, if that unrestricted pointer
@ -515,11 +517,22 @@ get_alias_set (tree t)
alias set for the type pointed to by the type of the
decl. */
HOST_WIDE_INT pointed_to_alias_set
= get_alias_set (TREE_TYPE (TREE_TYPE (decl)));
= get_alias_set (pointed_to_type);
if (pointed_to_alias_set == 0)
/* It's not legal to make a subset of alias set zero. */
DECL_POINTER_ALIAS_SET (decl) = 0;
else if (AGGREGATE_TYPE_P (pointed_to_type))
/* For an aggregate, we must treat the restricted
pointer the same as an ordinary pointer. If we
were to make the type pointed to by the
restricted pointer a subset of the pointed-to
type, then we would believe that other subsets
of the pointed-to type (such as fields of that
type) do not conflict with the type pointed to
by the restricted pointer. */
DECL_POINTER_ALIAS_SET (decl)
= pointed_to_alias_set;
else
{
DECL_POINTER_ALIAS_SET (decl) = new_alias_set ();