On Jan 17, 2012, at 11:21 AM, Comeau At9Fans <comeauat9f...@gmail.com> wrote:
> On Mon, Jan 16, 2012 at 2:03 PM, Bakul Shah <ba...@bitblocks.com> wrote: > How do you deal with longjmp? > > I don't have it in front of me, but I do seem to recall the Standard allows > that the VLA might still be around though, believe it has an example with > said, for better or worse... Do you have a reference? > On Jan 16, 2012, at 10:51 AM, Comeau At9Fans <comeauat9f...@gmail.com> wrote: >> On Mon, Jan 16, 2012 at 10:41 AM, Bakul Shah <ba...@bitblocks.com> wrote: >> A frame pointer is needed for C99's variable length arrays but not >> otherwise. Only an issue if ever plan9 C is extended to handle C99 or C1x. >> gcc has to do the right thing even with -fno-frame-pointer. >> >> What we do in problematic cases with Comeau is to generate code to arrange >> for the allocation of the VLA on the heap. I'm not saying this is perfect, >> but at least it gets the feature implementable and up and running as "a >> portable implementation" versus perhaps not being able to implement it at >> all on some platforms. Seems to me if you can port C, you can use a FP to implement VLAs without alloca games and more efficiently. You can always store the FP in stack local memory if out of registers.
