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Re: [PATCH] Use mmap for symbol tables
On Mon, Jan 30, 2006 at 09:34:38PM -0800, Jim Blandy wrote:
> On 1/30/06, Eirik Fuller <eirik@hackrat.com> wrote:
> > This suggests a simple way to complicate my mmap patch. If it can be
> > determined beforehand what interval of the symbol table gdb is going to
> > read in its entirety, that interval can be recorded in the BFD struct,
> > and the first mmap call can map just that interval. That will
> > complicate the offset calculations somewhat, but the basic approach will
> > be the same. This will only waste virtual address space if the sections
> > gdb would otherwise read don't form a contiguous region of the file.
>
> Actually, that's a pretty great idea. We could have the linker
> arrange to put all the debug sections together; that's easy. Then we
> could have the BFD API let GDB specify a list of sections to map. BFD
> would map the smallest contiguous region containing those sections.
> You'd get an interface that works with all files, but performs better
> when the linker does its job right.
... why? You're jumping through hoops here to avoid mmaping each
individual section, but I don't understand what's wrong with that.
--
Daniel Jacobowitz
CodeSourcery