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Re: libgo patch committed: Implement reflect.MakeFunc for 386


On Mon, Sep 30, 2013 at 6:07 AM, Rainer Orth
<ro@cebitec.uni-bielefeld.de> wrote:
> Ian Lance Taylor <iant@google.com> writes:
>
>> Following up on my earlier patch, this patch implements the
>> reflect.MakeFunc function for 386.
>>
>> Tom Tromey pointed out to me that the libffi closure support can
>> probably be used for this.  I was not aware of that support.  It
>> supports a lot more processors, and I should probably start using it.
>> The approach I am using does have a couple of advantages: it's more
>> efficient, and it doesn't require any type of writable executable
>> memory.  I can get away with that because indirect calls in Go always
>> pass a closure value.  So even when and if I do change to using libffi,
>> I might still keep this code for amd64 and 386.
>
> Unfortunately, this patch (and undoubtedly the corresponding amd64 one)
> break Solaris/x86 libgo bootstrap with native as:

Unfortunately I think I'll have to somehow disable this functionality
on systems with assemblers that do not understand the .cfi directives,
as otherwise calling panic in a function created with MakeFunc will
not work.

Ian


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