[Dwarf-Discuss] DW_OP_regX vs. DW_OP_bregX 0
Thu Feb 12 22:47:03 GMT 2009
Roland McGrath wrote:
>> GCC is producing nonstandard expressions.
> That is not in dispute.
>> If the 0 offset happens really a lot, it could be worth doing something
>> about it. Blessing GCC's current behavior doesn't feel right, though,
>> as it overloads DW_OP_regN to mean one thing when used by itself and
>> another thing when embedded in a larger expression.
> One could say that DW_OP_addr is overloaded in the same way.
> Alone it means "this address is the location". Embedded it
> means "push this address on the expression stack". The two
> (proposed) meanings for DW_OP_reg* are precisely analogous.
Roland, I suppose you mean "gcc overloads DW_OP_addr
in a similar non-standard way". ? What else could you mean?
DW_OP_addr is not overloaded in the DWARF3 spec. Either alone or
any other way it means 'push this address on the expression stack'.
At least ... AFAICT.
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