[Dwarf-Discuss] DW_FORM_data1 and DW_AT_const_value
Mon Jul 26 22:53:23 GMT 2010
Roland McGrath wrote:
>> There is a distinction between "ambiguous" and "unspecified".
>> The interpretation of the value of DW_FORM_data is unspecified.
>> I don't believe that there is any ambiguity.
> What I said was ambiguous was what the implications of that italicized
> (non-normative) paragraph were. I take it you are saying that it's
> unambiguous in that paragraph that DW_FORM_data* interpretation is
> unspecified, and therefore unambiguous that the paragraph implies nothing
> about that interpretation. Is that what you meant?
I don't think that either the normative or non-normative text
is ambiguous. It is explicit that the interpretation of the
value is unspecified and must be determined by producer and
consumer agreeing to an interpretation.
>>> I think it's wise (and is manifest existing practice) to use
>>> DW_FORM_data freely and be clear that they imply zero-extension.
>> That is not the interpretation described in the DWARF standard.
> You just said that the standard does not specify an interpretation.
You can't create an implication that DW_FORM_data is always
zero-extended based on the statement in the standard that the
interpretation is not specified.
Michael Eager eager at eagercon.com
1960 Park Blvd., Palo Alto, CA 94306 650-325-8077
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