From f0f224d12dc474c144b1a1c1b6864ecc0b768a24 Mon Sep 17 00:00:00 2001
From: David Majnemer <david.majnemer@gmail.com>
Date: Wed, 11 Nov 2015 21:57:16 +0000
Subject: [IR] Add support for empty tokens

When working with tokens, it is often the case that one has instructions
which consume a token and produce a new token.  Currently, we have no
mechanism to represent an initial token state.

Instead, we can create a notional "empty token" by inventing a new
constant which captures the semantics we would like.  This new constant
is called ConstantTokenNone and is written textually as "token none".

Differential Revision: http://reviews.llvm.org/D14581

llvm-svn: 252811
---
 llvm/lib/AsmParser/LLLexer.cpp | 1 +
 1 file changed, 1 insertion(+)

(limited to 'llvm/lib/AsmParser/LLLexer.cpp')

diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
index 91ce1fd7669..372c5658886 100644
--- a/llvm/lib/AsmParser/LLLexer.cpp
+++ b/llvm/lib/AsmParser/LLLexer.cpp
@@ -523,6 +523,7 @@ lltok::Kind LLLexer::LexIdentifier() {
   KEYWORD(zeroinitializer);
   KEYWORD(undef);
   KEYWORD(null);
+  KEYWORD(none);
   KEYWORD(to);
   KEYWORD(caller);
   KEYWORD(tail);
-- 
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