> On Sep 22, 2014, at 11:22 AM, Jan Hubicka <hubi...@ucw.cz> wrote:
> >> Not quite:
> >>
> >> offset_int woffset
> >> = (wi::to_offset (xoffset)
> >> + wi::lrshift (wi::to_offset (DECL_FIELD_BIT_OFFSET (field)),
> >> LOG2_BITS_PER_UNIT));
> >>
> >> offset_int is the type that can hold all bit positions, byte positions,
> >> byte sizes and bit sizes.
> >
> > Yep, I worked that out in meantime. Now I get:
> > ../../gcc/tree.h: In function �long int int_bit_position(const_tree)�:
> > ../../gcc/tree.h:3890:24: error: �to_offset� is not a member of �wi�
> > return (wi::lrshift (wi::to_offset (DECL_FIELD_OFFSET (field)),
> > BITS_PER_UNIT_LOG)
>
> That is defined later in tree.h? If you want to use it in tree.h, you will
> have to have it after to_offset is defined. Alternatively, you can move it
> up, but, you will need to understand the dependancies some (or try some
> builds).
Aha, missed that bit. I am testing this variant.
Honza
Index: tree.h
===================================================================
--- tree.h (revision 215421)
+++ tree.h (working copy)
@@ -3877,10 +3877,9 @@ extern tree size_in_bytes (const_tree);
extern HOST_WIDE_INT int_size_in_bytes (const_tree);
extern HOST_WIDE_INT max_int_size_in_bytes (const_tree);
extern tree bit_position (const_tree);
-extern HOST_WIDE_INT int_bit_position (const_tree);
extern tree byte_position (const_tree);
extern HOST_WIDE_INT int_byte_position (const_tree);
#define sizetype sizetype_tab[(int) stk_sizetype]
#define bitsizetype sizetype_tab[(int) stk_bitsizetype]
#define ssizetype sizetype_tab[(int) stk_ssizetype]
@@ -4797,4 +4797,14 @@ extern tree get_inner_reference (tree, H
EXP, an ARRAY_REF or an ARRAY_RANGE_REF. */
extern tree array_ref_low_bound (tree);
+/* Like bit_position, but return as an integer. It must be representable in
+ that way (since it could be a signed value, we don't have the
+ option of returning -1 like int_size_in_byte can. */
+
+static inline HOST_WIDE_INT
+int_bit_position (const_tree field)
+{
+ return (wi::lrshift (wi::to_offset (DECL_FIELD_OFFSET (field)),
BITS_PER_UNIT_LOG)
+ + wi::to_offset (DECL_FIELD_BIT_OFFSET (field))).to_shwi ();
+}
#endif /* GCC_TREE_H */
