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Author SHA1 Message Date
Rafael Espindola 83a362cde8 Change the .ll syntax for comdats and add a syntactic sugar. 
In order to make comdats always explicit in the IR, we decided to make
the syntax a bit more compact for the case of a GlobalObject in a
comdat with the same name.

Just dropping the $name causes problems for

@foo = globabl i32 0, comdat
$bar = comdat ...

and

declare void @foo() comdat
$bar = comdat ...

So the syntax is changed to

@g1 = globabl i32 0, comdat($c1)
@g2 = globabl i32 0, comdat

and

declare void @foo() comdat($c1)
declare void @foo() comdat

llvm-svn: 225302
 2015-01-06 22:55:16 +00:00
Rafael Espindola 2c301f5c8c Cleanup this test a bit. 
Use simpler names and remove unnecessary fields.

llvm-svn: 220498
 2014-10-23 19:23:42 +00:00
David Majnemer dad0a645a7 IR: Add COMDATs to the IR 
This new IR facility allows us to represent the object-file semantic of
a COMDAT group.

COMDATs allow us to tie together sections and make the inclusion of one
dependent on another. This is required to implement features like MS
ABI VFTables and optimizing away certain kinds of initialization in C++.

This functionality is only representable in COFF and ELF, Mach-O has no
similar mechanism.

Differential Revision: http://reviews.llvm.org/D4178

llvm-svn: 211920
 2014-06-27 18:19:56 +00:00