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LowerBitSets: Give names to aliases of unnamed bitset element objects.

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It is valid for globals to be unnamed, but aliases must have a name. To avoid
creating invalid IR, we need to assign names to any aliases we create that
point to unnamed objects that have been moved into combined globals.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239590 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne 2015-06-12 03:25:05 +00:00
parent e0de59ac91
commit ba74b27ed1
2 changed files with 22 additions and 2 deletions
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5
lib/Transforms/IPO/LowerBitSets.cpp
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@ -556,8 +556,9 @@ void LowerBitSets::buildBitSetsFromGlobals(
} else {
GlobalAlias *GAlias =
GlobalAlias::create(Globals[I]->getType(), Globals[I]->getLinkage(),
"", CombinedGlobalElemPtr, M);
GAlias->takeName(Globals[I]);
"data", CombinedGlobalElemPtr, M);
if (Globals[I]->hasName())
GAlias->takeName(Globals[I]);
Globals[I]->replaceAllUsesWith(GAlias);
}
Globals[I]->eraseFromParent();

19
test/Transforms/LowerBitSets/unnamed.ll Normal file
View File

@ -0,0 +1,19 @@
; RUN: opt -S -lowerbitsets < %s | FileCheck %s
target datalayout = "e-p:32:32"
; CHECK: @data ={{.*}} alias
@0 = constant i32 1
@1 = constant [2 x i32] [i32 2, i32 3]
!0 = !{!"bitset1", i32* @0, i32 0}
!1 = !{!"bitset1", [2 x i32]* @1, i32 4}
!llvm.bitsets = !{ !0, !1 }
declare i1 @llvm.bitset.test(i8* %ptr, metadata %bitset) nounwind readnone
define i1 @foo(i8* %p) {
%x = call i1 @llvm.bitset.test(i8* %p, metadata !"bitset1")
ret i1 %x
}