Add ability for MCInstPrinters to add comments for instructions.

Enhance the x86 backend to show the hex values of immediates in
comments when they are large.  For example:

        movl    $1072693248, 4(%esp)    ## imm = 0x3FF00000



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95728 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 1 deletions

diff --git a/include/llvm/MC/MCInstPrinter.h b/include/llvm/MC/MCInstPrinter.h
index d62a9dae7c..8829518632 100644
--- a/include/llvm/MC/MCInstPrinter.h
+++ b/include/llvm/MC/MCInstPrinter.h
@@ -20,12 +20,22 @@ class MCAsmInfo;
 /// that converts an MCInst to valid target assembly syntax.
 class MCInstPrinter {
 protected:
+  /// O - The main stream to emit instruction text to.
   raw_ostream &O;
+  
+  /// CommentStream - a stream that comments can be emitted to if desired.
+  /// Each comment must end with a newline.  This will be null if verbose
+  /// assembly emission is disable.
+  raw_ostream *CommentStream;
   const MCAsmInfo &MAI;
 public:
-  MCInstPrinter(raw_ostream &o, const MCAsmInfo &mai) : O(o), MAI(mai) {}
+  MCInstPrinter(raw_ostream &o, const MCAsmInfo &mai)
+    : O(o), CommentStream(0), MAI(mai) {}
   
   virtual ~MCInstPrinter();
+
+  /// setCommentStream - Specify a stream to emit comments to.
+  void setCommentStream(raw_ostream &OS) { CommentStream = &OS; }
   
   /// printInst - Print the specified MCInst to the current raw_ostream.
   ///