[llvm] r192265 - Add a paragraph about MCTargetStreamer.

[Rafael Espindola]

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
 -----------------------