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List:       llvm-dev
Subject:    Re: [LLVMdev] Old JIT Status (i.e., can we delete it?)
From:       "Kaylor, Andrew" <andrew.kaylor () intel ! com>
Date:       2012-11-29 23:31:38
Message-ID: 0983E6C011D2DC4188F8761B533492DE3AE8CB41 () ORSMSX105 ! amr ! corp ! intel ! com
[Download RAW message or body]

I don't think that GDB support is even present in the latest version of the=
 old JIT in trunk.  It used to have code to register emitted functions with=
 GDB in a way that let GDB find the function name and EH frame information,=
 but that got taken out back in January (r147615).  As it stands now, I don=
't think GDB would provide any useful information at all about code emitted=
 by the old JIT.

MCJIT, on ELF platforms at least, registers emitted code with GDB for full =
source level debugging (when debug info is available).

-Andy

-----Original Message-----
From: llvmdev-bounces@cs.uiuc.edu [mailto:llvmdev-bounces@cs.uiuc.edu] On B=
ehalf Of Solomon Boulos
Sent: Thursday, November 29, 2012 1:01 PM
To: llvmdev@cs.uiuc.edu
Subject: Re: [LLVMdev] Old JIT Status (i.e., can we delete it?)

On Nov 24, 2012, at 3:50 PM, Rafael Esp=EDndola wrote:

> On 24 November 2012 17:36, Chris Lattner <clattner at apple.com> wrote:
>> As others have said, unfortunately it is premature to remove the old jit=
.  I don't know of anyone using the EH code though... It can almost certain=
ly be removed!
> =

> Cool. I will remove the EH bits by the end of the week if no one complain=
s.

Do you mean you're going to remove EH entirely from the old JIT?  If so, I'=
ll complain ;).

As you pointed out earlier the EH bits are useful for stack frames on x86_6=
4.  In particular, to get useful stack traces from gdb with JIT'ed code tho=
se EH frames need to be there.  So even if other people don't currently set=
 JITExceptionHandling for this purpose (I do in a few projects), they proba=
bly will when they see crashes.

Solomon


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