Reentering sections

Reentering sections

[Roman Lechtchinsky]

Hi,

the function output_function_exception_table in except.c first opens an
exception section and then, after outputting the exception table, reenters
the function section for the function to which the table belongs. This
doesn't work on the Cray T3E since the assembler doesn't support reopening
sections. Is this behavior actually necessary (the entire function body is
output before output_function_exception_table is called, AFAICS) or is the
call to function_section bogus?

Bye

Roman

Re: Reentering sections

[Richard Henderson]

On Fri, Sep 21, 2001 at 02:18:09PM +0200, Roman Lechtchinsky wrote:
> Is this behavior actually necessary (the entire function body is
> output before output_function_exception_table is called, AFAICS) or is the
> call to function_section bogus?

As currently configured, we have yet to do assemble_end_function,
which does need to be in function_section.  The reason that we do
that is that IA-64 has special assembler directives to emit EH
table info, like so:

	.proc foo
foo:
	[ code ]
	.handlerdata
	[ eh data ]
	.endp foo

where ".endp" is emitted by ASM_DECLARE_FUNCTION_SIZE in 
assemble_end_function.

It should be possible to rearrange this based on IA64_UNWIND_INFO.


r~

Re: Reentering sections

[Roman Lechtchinsky]

On Fri, 21 Sep 2001, Richard Henderson wrote:
> > Is this behavior actually necessary (the entire function body is
> > output before output_function_exception_table is called, AFAICS) or is the
> > call to function_section bogus?
> 
> As currently configured, we have yet to do assemble_end_function,
> which does need to be in function_section.
> [...]
> It should be possible to rearrange this based on IA64_UNWIND_INFO.

Yep, there is one more problem, though. (*debug_hooks->function_decl) is
called after output_function_exception_table, but it needs to be in the
function section. Can it be output directly after assemle_end_function,
i.e. before the exception table on non-IA64_UNWIND_INFO architectures?

Bye

Roman

Re: Reentering sections

[Richard Henderson]

On Wed, Sep 26, 2001 at 02:09:16PM +0200, Roman Lechtchinsky wrote:
> Yep, there is one more problem, though. (*debug_hooks->function_decl) is
> called after output_function_exception_table, but it needs to be in the
> function section. Can it be output directly after assemle_end_function,
> i.e. before the exception table on non-IA64_UNWIND_INFO architectures?

Yes.


r~