[PATCH] D12618: Reserve a vendor reserved block ID for bitcode

[Mehdi AMINI via llvm-commits]

joker.eph created this revision.
joker.eph added a reviewer: rafael.
joker.eph added a subscriber: llvm-commits.

The idea is that vendor toolchains can insert a block for their own
internal purpose while generating bitcode that will be compatible
with the open-source tools. The latter just ignoring this block.

We (Apple) intend to use it for versioning the bitcode. The versioning
would not make sense with respect to open-source release since our
internal versions/releases don't align.

http://reviews.llvm.org/D12618

Files:
  include/llvm/Bitcode/LLVMBitCodes.h

Index: include/llvm/Bitcode/LLVMBitCodes.h
===================================================================
--- include/llvm/Bitcode/LLVMBitCodes.h
+++ include/llvm/Bitcode/LLVMBitCodes.h
@@ -34,7 +34,8 @@
     CONSTANTS_BLOCK_ID,
     FUNCTION_BLOCK_ID,
 
-    UNUSED_ID1,
+    // Valid inside vendor specific toolchains only, discarded by open-source
+    VENDOR_RESERVED_ID,
 
     VALUE_SYMTAB_BLOCK_ID,
     METADATA_BLOCK_ID,


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