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Bitcode: Add METADATA_NODE and METADATA_VALUE

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This reflects the typelessness of `Metadata` in the bitcode format,
removing types from all metadata operands.

`METADATA_VALUE` represents a `ValueAsMetadata`, and always has two
fields: the type and the value.

`METADATA_NODE` represents an `MDNode`, and unlike `METADATA_OLD_NODE`,
doesn't store types.  It stores operands at their ID+1 so that `0` can
reference `nullptr` operands.

Part of PR21532.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224073 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2014-12-11 23:02:24 +00:00
parent f329765d23
commit e39dba9f07
7 changed files with 61 additions and 40 deletions
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4
include/llvm/Bitcode/LLVMBitCodes.h
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@ -137,8 +137,8 @@ namespace bitc {
enum MetadataCodes {
METADATA_STRING = 1, // MDSTRING: [values]
// 2 is unused.
// 3 is unused.
METADATA_VALUE = 2, // VALUE: [type num, value num]
METADATA_NODE = 3, // NODE: [n x md num]
METADATA_NAME = 4, // STRING: [values]
// 5 is unused.
METADATA_KIND = 6, // [n x [id, name]]