[llvm] r192265 - Add a paragraph about MCTargetStreamer.

[Rafael Espíndola]

I added a bit more information in r192796. Adding code fragments would
seem a bit out of place in that document.

Cheers,
Rafael


On 9 October 2013 13:20, Quentin Colombet <qcolombet at apple.com> wrote:
> Hi Rafael,
>
> Thanks for this adding!
>
> I think we could also give more information on how to set this information.
> In particular, I think it may be useful to explain the need of a call to
> TargetRegistry::RegisterXXXStreamer and quickly explain what the registered
> function is supposed to do (basically, create the related MCTargetStreamer
> and pass it down to the default createXXXStreamer).
> Mentioning or directly putting code fragment from Mips (or ARM) as an
> example may greatly help.
>
> Thanks again.
>
> Cheers,
> -Quentin
>
> On Oct 8, 2013, at 7:05 PM, Rafael Espindola <rafael.espindola at gmail.com>
> wrote:
>
> Author: rafael
> Date: Tue Oct  8 21:05:08 2013
> New Revision: 192265
>
> URL: http://llvm.org/viewvc/llvm-project?rev=192265&view=rev
> Log:
> Add a paragraph about MCTargetStreamer.
>
> Modified:
>    llvm/trunk/docs/CodeGenerator.rst
>
> Modified: llvm/trunk/docs/CodeGenerator.rst
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/CodeGenerator.rst?rev=192265&r1=192264&r2=192265&view=diff
> ==============================================================================
> --- llvm/trunk/docs/CodeGenerator.rst (original)
> +++ llvm/trunk/docs/CodeGenerator.rst Tue Oct  8 21:05:08 2013
> @@ -636,6 +636,13 @@ file (MCObjectStreamer).  MCAsmStreamer
> that prints out a directive for each method (e.g. ``EmitValue -> .byte``),
> but
> MCObjectStreamer implements a full assembler.
>
> +For target specific directives, the MCStreamer has a MCTargetStreamer
> instance.
> +Each target that needs it defines a class that inherits from it and is a
> lot
> +like MCStreamer itself: It has one method per directive and two classes
> that
> +inherit from it, a target object streamer and a target asm streamer. The
> target
> +asm streamer just prints it (``emitFnStart -> .fnstrart``), and the object
> +streamer implement the assembler logic for it.
> +
> The ``MCContext`` class
> -----------------------
>
>
>
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