[PATCH] D14581: [IR] Add support for empty tokens

[David Majnemer via llvm-commits]

majnemer created this revision.
majnemer added reviewers: rnk, JosephTremoulet, andrew.w.kaylor.
majnemer added a subscriber: llvm-commits.

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".

http://reviews.llvm.org/D14581

Files:
  docs/LangRef.rst
  include/llvm-c/Core.h
  include/llvm/IR/Constants.h
  include/llvm/IR/Value.def
  lib/AsmParser/LLLexer.cpp
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLParser.h
  lib/AsmParser/LLToken.h
  lib/IR/AsmWriter.cpp
  lib/IR/Constants.cpp
  lib/IR/LLVMContextImpl.cpp
  lib/IR/LLVMContextImpl.h
  lib/Transforms/IPO/MergeFunctions.cpp
  test/Assembler/token.ll

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