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cp-tree.h (BINFO_OVERRIDE_ALONG_VIRTUAL_PATH): New macro. 

* cp-tree.h (BINFO_OVERRIDE_ALONG_VIRTUAL_PATH): New macro.
	* class.c (dfs_find_final_overrider): Set it appropriately.
	(dfs_built_vtt_inits): Check BINFO_OVERRIDE_ALONG_VIRTUAL_PATH to
	avoid unneeded secondary vptrs.

From-SVN: r34549
This commit is contained in:
Mark Mitchell 2000-06-14 16:10:14 +00:00 committed by Mark Mitchell
parent 33261b0a22
commit db3d8cded1
3 changed files with 48 additions and 5 deletions
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7
gcc/cp/ChangeLog
View File

@ -1,3 +1,10 @@
2000-06-14 Mark Mitchell <mark@codesourcery.com>
* cp-tree.h (BINFO_OVERRIDE_ALONG_VIRTUAL_PATH): New macro.
* class.c (dfs_find_final_overrider): Set it appropriately.
(dfs_built_vtt_inits): Check BINFO_OVERRIDE_ALONG_VIRTUAL_PATH to
avoid unneeded secondary vptrs.
2000-06-13 Jakub Jelinek <jakub@redhat.com>
* class.c (build_secondary_vtable): Set DECL_USER_ALIGN.

39
gcc/cp/class.c
View File

@ -2453,9 +2453,11 @@ dfs_find_final_overrider (binfo, data)
tree path;
tree method;
/* We haven't found an overrider yet. */
method = NULL_TREE;
/* We've found a path to the declaring base. Walk down the path
looking for an overrider for FN. */
for (path = reverse_path (binfo);
for (path = reverse_path (binfo);
path;
path = TREE_CHAIN (path))
{
@ -2474,6 +2476,24 @@ dfs_find_final_overrider (binfo, data)
the base from which it came. */
if (path)
{
tree base;
/* Assume the path is non-virtual. See if there are any base from
(but not including) the overrider up to and including the
base where the function is defined. */
for (base = TREE_CHAIN (path); base; base = TREE_CHAIN (base))
if (TREE_VIA_VIRTUAL (TREE_VALUE (base)))
{
base = ffod->declaring_base;
while (BINFO_PRIMARY_MARKED_P (base))
{
BINFO_OVERRIDE_ALONG_VIRTUAL_PATH_P (base) = 1;
base = BINFO_INHERITANCE_CHAIN (base);
}
BINFO_OVERRIDE_ALONG_VIRTUAL_PATH_P (base) = 1;
break;
}
if (ffod->overriding_fn && ffod->overriding_fn != method)
{
/* We've found a different overrider along a different
@ -6729,10 +6749,19 @@ dfs_build_vtt_inits (binfo, data)
/* If BINFO doesn't have virtual bases, then we have to look to see
whether or not any virtual functions were overidden along a
virtual path between the declaration and T. */
if (!TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo)))
/* FIXME: Implement this. */
;
virtual path. The point is that given:
struct V { virtual void f(); int i; };
struct C : public V { void f (); };
when we constrct C we need a secondary vptr for V-in-C because we
don't know what the vcall offset for `f' should be. If `V' ends
up in a different place in the complete object, then we'll need a
different vcall offset than that present in the normal V-in-C
vtable. */
if (!TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo))
&& !BINFO_OVERRIDE_ALONG_VIRTUAL_PATH_P (binfo))
return NULL_TREE;
/* Record the index where this secondary vptr can be found. */
index = TREE_TYPE (l);

7
gcc/cp/cp-tree.h
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@ -55,11 +55,13 @@ Boston, MA 02111-1307, USA. */
BASELINK_P (in TREE_LIST)
ICS_ELLIPSIS_FLAG (in _CONV)
STMT_IS_FULL_EXPR_P (in _STMT)
BINFO_ACCESS (in BINFO)
2: IDENTIFIER_OPNAME_P.
TYPE_POLYMORHPIC_P (in _TYPE)
ICS_THIS_FLAG (in _CONV)
STMT_LINENO_FOR_FN_P (in _STMT)
BINDING_HAS_LEVEL_P (in CPLUS_BINDING)
BINFO_OVERRIDE_ALONG_VIRTUAL_PATH_P (in BINFO)
3: TYPE_USES_VIRTUAL_BASECLASSES (in a class TYPE).
BINFO_VTABLE_PATH_MARKED.
BINFO_PUSHDECLS_MARKED.
@ -76,6 +78,7 @@ Boston, MA 02111-1307, USA. */
IDENTIFIER_TYPENAME_P (in IDENTIFIER_NODE)
5: BINFO_PRIMARY_MARKED_P (in BINFO)
6: BINFO_VBASE_PRIMARY_P (in BINFO)
BINFO_ACCESS (in BINFO)
Usage of TYPE_LANG_FLAG_?:
0: C_TYPE_FIELDS_READONLY (in RECORD_TYPE or UNION_TYPE).
@ -1784,6 +1787,10 @@ struct lang_type
found. NULL_TREE if there is no secondary vptr in the VTT. */
#define BINFO_VPTR_INDEX(NODE) TREE_VEC_ELT ((NODE), 9)
/* Nonzero if this binfo declares a virtual function which is
overridden along a virtual path. */
#define BINFO_OVERRIDE_ALONG_VIRTUAL_PATH_P(NODE) TREE_LANG_FLAG_2 (NODE)
/* Used by various search routines. */
#define IDENTIFIER_MARKED(NODE) TREE_LANG_FLAG_0 (NODE)