[LLVMdev] [PATCH] - Union types, attempt 2

Talin viridia at gmail.com
Wed Jan 6 12:45:02 PST 2010

This patch adds a UnionType to DerivedTypes.h. It also adds code to the
bitcode reader / writer and the assembly parser for the new type, as well as
a tiny .ll test file in test/Assembler. It does not contain any code related
to code generation or type layout - I wanted to see if this much was
acceptable before I proceeded any further.

Unlike my previous patch, in which the Union type was implemented as a
packing option to type Struct (thereby re-using the machinery of Struct),
this patch defines Union as a completely separate type from Struct.

I was a little uncertain as to how to write the tests. I'd particularly like
to write tests for the bitcode reader/writer stuff, but I am not sure how to
do that.

-- Talin
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