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class.c (layout_virtual_bases): Do all dsize computation on trees. 

* class.c (layout_virtual_bases): Do all dsize computation on trees.

	* g++.dg/other/big-struct.C: New test.

From-SVN: r52303
This commit is contained in:
Jakub Jelinek 2002-04-14 22:53:59 +02:00 committed by Jakub Jelinek
parent 350bd56e77
commit 70427c9b1a
4 changed files with 32 additions and 13 deletions
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4
gcc/cp/ChangeLog
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@ -1,3 +1,7 @@
2002-04-14 Jakub Jelinek <jakub@redhat.com>
* class.c (layout_virtual_bases): Do all dsize computation on trees.
2002-04-12 Mark Mitchell <mark@codesourcery.com>
PR c++/5373.

27
gcc/cp/class.c
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@ -4613,8 +4613,7 @@ layout_virtual_bases (t, offsets)
tree t;
splay_tree offsets;
{
tree vbases;
unsigned HOST_WIDE_INT dsize;
tree vbases, dsize;
unsigned HOST_WIDE_INT eoc;
if (CLASSTYPE_N_BASECLASSES (t) == 0)
@ -4627,7 +4626,7 @@ layout_virtual_bases (t, offsets)
#endif
/* DSIZE is the size of the class without the virtual bases. */
dsize = tree_low_cst (TYPE_SIZE (t), 1);
dsize = TYPE_SIZE (t);
/* Make every class have alignment of at least one. */
TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), BITS_PER_UNIT);
@ -4649,7 +4648,7 @@ layout_virtual_bases (t, offsets)
{
/* This virtual base is not a primary base of any class in the
hierarchy, so we have to add space for it. */
tree basetype;
tree basetype, usize;
unsigned int desired_align;
basetype = BINFO_TYPE (vbase);
@ -4659,19 +4658,21 @@ layout_virtual_bases (t, offsets)
/* Add padding so that we can put the virtual base class at an
appropriately aligned offset. */
dsize = CEIL (dsize, desired_align) * desired_align;
dsize = round_up (dsize, desired_align);
usize = size_binop (CEIL_DIV_EXPR, dsize, bitsize_unit_node);
/* We try to squish empty virtual bases in just like
ordinary empty bases. */
if (is_empty_class (basetype))
layout_empty_base (vbase,
size_int (CEIL (dsize, BITS_PER_UNIT)),
convert (sizetype, usize),
offsets, t);
else
{
tree offset;
offset = ssize_int (CEIL (dsize, BITS_PER_UNIT));
offset = convert (ssizetype, usize);
offset = size_diffop (offset,
convert (ssizetype,
BINFO_OFFSET (vbase)));
@ -4681,8 +4682,9 @@ layout_virtual_bases (t, offsets)
/* Every virtual baseclass takes a least a UNIT, so that
we can take it's address and get something different
for each base. */
dsize += MAX (BITS_PER_UNIT,
tree_low_cst (CLASSTYPE_SIZE (basetype), 0));
dsize = size_binop (PLUS_EXPR, dsize,
size_binop (MAX_EXPR, bitsize_unit_node,
CLASSTYPE_SIZE (basetype)));
}
/* Keep track of the offsets assigned to this virtual base. */
@ -4704,13 +4706,12 @@ layout_virtual_bases (t, offsets)
class, we didn't update DSIZE above; we were hoping to overlay
multiple such bases at the same location. */
eoc = end_of_class (t, /*include_virtuals_p=*/1);
if (eoc * BITS_PER_UNIT > dsize)
dsize = eoc * BITS_PER_UNIT;
dsize = size_binop (MAX_EXPR, dsize, bitsize_int (eoc * BITS_PER_UNIT));
/* Now, make sure that the total size of the type is a multiple of
its alignment. */
dsize = CEIL (dsize, TYPE_ALIGN (t)) * TYPE_ALIGN (t);
TYPE_SIZE (t) = bitsize_int (dsize);
dsize = round_up (dsize, TYPE_ALIGN (t));
TYPE_SIZE (t) = dsize;
TYPE_SIZE_UNIT (t) = convert (sizetype,
size_binop (CEIL_DIV_EXPR, TYPE_SIZE (t),
bitsize_unit_node));

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2002-04-14 Jakub Jelinek <jakub@redhat.com>
* g++.dg/other/big-struct.C: New test.
2002-04-14 David Billinghurst <David.Billinghurst@riotinto.com>
PR c/6277

10
gcc/testsuite/g++.dg/other/big-struct.C Normal file
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@ -0,0 +1,10 @@
// { dg-do compile { target i?86-*-* } }
struct A
{
};
struct B : public A
{
char b[0x20000000];
} e;