Re: New experimental back end for C/C++ compiler targeting CLI

On 30/08/2016 02:21, Walter Banks wrote:
> On 2016-08-29 1:52 PM, BartC wrote:
>> I've played with source-to-source translators, and never managed to
>> deal with comments properly and in the end gave up. ...
>
>
> How we handled the comments on the asm to asm translation was put the
> whole sourceline into in our case a C statement // comment with enough
> parsing information to tie it as well to the generated code. A filter
> (In our case a compiler pragma) reprocessed the listing line. It could
> have been done with a small post processing program quite easily.


I'm mainly familiar with ASM syntax that is strictly line-oriented and
with a flat code structure.


Then comments can either be tied to a particular instruction, or are on
their own line and might be assumed to refer to the next block of
instructions. (But then, they could be continuing a long comment too.)


But I'm not sure what you mean by an ASM to ASM translator; from your
other remarks it sounds like this is an ASM to C translator, where the C
is then compiled to another ASM (presumably with the original comments?).


It still doesn't sound that straightforward when N commented lines in
the source end up as M commented lines in output. And surely sometimes
the comments for the source ASM are meaningless on the target?


--
Bartc

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