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211004.1 Paul Robinson Replace DW_MACRO_define/undef_sup with sized versions Enhancement Open


Section various, pg various
Background:

As for DW_FORM_ref_sup[4,8], and issue 181026.2 which proposes a similar
pair of forms to replace DW_FORM_strp_sup, the macro definition opcodes
should allow distinguishing between 4-byte and 8-byte offsets within a
supplementary object file, and not assume the supplementary file and all
referencing files use the same 32/64 format.

Proposed changes to the specification:

Section 6.3.1 Macro Information Header

On p.166, lines 11-13, in the description of the `offset_size_flag` 
add a sentence saying:
  This flag does not apply to the opcodes DW_MACRO_define_sup4,
  DW_MACRO_define_sup8, DW_MACRO_undef_sup4, and DW_MACRO_define_sup8.


Section 6.3.2.1 Define and Undefine Entries

On p.168, lines 17-23, replace item 4 (DW_MACRO_define_sup, DW_MACRO_undef_sup)
with the following (making the offset size dependent on the opcode
rather than the `offset_size_flag` field):

4. DW_MACRO_define_sup4, DW_MACRO_define_sup8, DW_MACRO_undef_sup4,
   DW_MACRO_undef_sup8
    A DW_MACRO_define_sup4, DW_MACRO_define_sup8, DW_MACRO_undef_sup4,
    or DW_MACRO_undef_sup8 entry has two operands.  The first operand
    encodes the line number of the `#define` or `#undef` macro directive.
    The second operand identifies a string; it is represented as an 
    4-byte (DW_MACRO_define_sup4, DW_MACRO_undef_sup4) or 8-byte
    (DW_MACRO_define_sup8, DW_MACRO_undef_sup8) offset into the 
    `.debug_str` section of the supplementary object file.


Section 6.3.2.2 Macro Define String

On p.168 line 28, replace "DW_MACRO_define_sup" with "DW_MACRO_define_sup4
or DW_MACRO_define_sup8".


Section 6.3.2.3 Macro Undefine String

On p.168 line 8, replace "DW_MACRO_undef_sup" with "DW_MACRO_undef_sup4
or DW_MACRO_undef_sup8".


Section 6.3.3.2 Importation of Macro Units

On p.170, lines 24-29, replace the title and first paragraph of item 2
(DW_MACRO_import_sup) with the following:

2. DW_MACRO_import_sup4, DW_MACRO_import_sup8
    A DW_MACRO_import_sup4 or DW_MACRO_import_sup8 entry has one operand,
    a 4-byte (DW_MACRO_import_sup4) or 8-byte (DW_MACRO_import_sup8) offset
    from the start of the `.debug_macro` section in the supplementary object
    file.  Apart from the different location in which to find the macro 
    unit, these entry types are equivalent to DW_MACRO_import.


Section 7.3.6 DWARF Supplementary Object Files

On p.195, lines 28, replace "DW_MACRO_define_sup or DW_MACRO_undef_sup"
with "DW_MACRO_define_sup4, DW_MACRO_define_sup8, DW_MACRO_undef_sup4
or DW_MACRO_undef_sup8".

On p.195, line 30, replace "DW_MACRO_import_sup" with "DW_MACRO_import_sup4
or DW_MACRO_import_sup8".

Issue 181026.2 adds a non-normative paragraph to this section; probably it
should go at the end of the entire section, as it applies to both the forms
and macro directives.





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