From: Keith Walker <keith.walker@arm.com>
To: Richard.Earnshaw@arm.com, Daniel Jacobowitz <drow@mvista.com>
Cc: Andrew Cagney <ac131313@redhat.com>,
Mark Kettenis <kettenis@chello.nl>,
brobecker@gnat.com, mec@shout.net, gdb@sources.redhat.com,
Richard.Earnshaw@arm.com
Subject: Re: 8-byte register values on a 32-bit machine
Date: Mon, 03 Mar 2003 11:52:00 -0000 [thread overview]
Message-ID: <4.3.2.7.2.20030303114307.023fb548@mhsun1.maidenhead.arm.com> (raw)
In-Reply-To: <200303031125.h23BPKW06819@pc960.cambridge.arm.com>
At 11:25 03/03/2003 +0000, Richard Earnshaw wrote:
> > On Sat, Mar 01, 2003 at 06:42:58PM -0500, Andrew Cagney wrote:
> >
> > By the way, assuming I can find the time (ugh) I'm not done with
> > LOC_COMPUTED yet. On my list so far:
> > - Location lists
> > - Turning locations into better defined objects
> > - Thus, allowing LOC_COMPUTED to return a non-computed "location"
> > - Allowing more complex locations, namely DW_OP_piece style.
> > - Eventually turning on more uses of DW_OP_piece in GCC.
>
>The main reason gcc allocates objects to contiguous register ranges is
>because gdb can't handle anything else. Fixing gdb to allow location
>lists would be a major step forward, since then gcc would be able to split
>double-register objects before register allocation and allocate each part
>individually. That could be a major win on register starved machines.
Actually it is the implementation of the DW_OP_piece operator (rather than
location lists) which allows the location of an object to be split into
multiple sub-locations.
Location lists allows, for any given PC value, for you to describe zero
(optimized out) or more locations for an object. These locations can
then be broken down into sub-locations if the resulting expression
evaluated then contains a DW_OP_piece operator.
Keith
next prev parent reply other threads:[~2003-03-03 11:52 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-24 2:36 Michael Elizabeth Chastain
2003-03-01 13:35 ` Mark Kettenis
2003-03-01 20:33 ` Joel Brobecker
2003-03-01 22:38 ` Mark Kettenis
2003-03-01 23:41 ` Andrew Cagney
2003-03-02 0:28 ` Daniel Jacobowitz
2003-03-03 11:26 ` Richard Earnshaw
2003-03-03 11:52 ` Keith Walker [this message]
2003-03-01 23:39 ` Andrew Cagney
2003-03-01 20:57 Michael Elizabeth Chastain
2003-03-01 22:46 ` Mark Kettenis
2003-03-02 6:52 Michael Elizabeth Chastain
2003-03-02 9:35 ` Stephane Carrez
2003-03-03 4:50 ` Daniel Jacobowitz
2003-03-02 16:59 Michael Elizabeth Chastain
2003-03-12 15:35 ` Andrew Cagney
2003-03-12 15:51 ` Daniel Jacobowitz
2003-03-12 16:57 ` Andrew Cagney
2003-03-12 17:01 ` Daniel Jacobowitz
2003-03-12 18:15 ` Andrew Cagney
2003-03-12 18:29 ` Andrew Cagney
2003-03-12 18:35 ` Daniel Jacobowitz
2003-03-12 18:38 ` Andrew Cagney
2003-03-12 18:48 ` Paul Koning
2003-03-12 19:00 ` Daniel Jacobowitz
2003-03-12 21:04 ` Andrew Cagney
2003-03-12 20:06 ` Daniel Jacobowitz
2003-03-12 19:09 Michael Elizabeth Chastain
2003-03-12 20:47 ` Andrew Cagney
2003-03-13 4:18 Michael Elizabeth Chastain
2003-03-13 17:05 ` Andrew Cagney
2003-03-14 16:27 Michael Elizabeth Chastain
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