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Don't crash when llvm.compiler.used becomes empty.

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GlobalOpt simplifies llvm.compiler.used by removing any members that are also
in the more strict llvm.used. Handle the special case where llvm.compiler.used
becomes empty.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186778 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2013-07-20 23:33:15 +00:00
parent c5b8b590ee
commit 64f2f910bd
2 changed files with 21 additions and 0 deletions
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5
lib/Transforms/IPO/GlobalOpt.cpp
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@ -3070,6 +3070,11 @@ static int compareNames(const void *A, const void *B) {
static void setUsedInitializer(GlobalVariable &V,
SmallPtrSet<GlobalValue *, 8> Init) {
if (Init.empty()) {
V.eraseFromParent();
return;
}
SmallVector<llvm::Constant *, 8> UsedArray;
PointerType *Int8PtrTy = Type::getInt8PtrTy(V.getContext());

16
test/Transforms/GlobalOpt/compiler-used.ll Normal file
View File

@ -0,0 +1,16 @@
; RUN: opt < %s -globalopt -S | FileCheck %s
; Test that when all members of llvm.compiler.used are found to be redundant
; we delete it instead of crashing.
define void @foo() {
ret void
}
@llvm.used = appending global [1 x i8*] [i8* bitcast (void ()* @foo to i8*)], section "llvm.metadata"
@llvm.compiler.used = appending global [1 x i8*] [i8* bitcast (void ()* @foo to i8*)], section "llvm.metadata"
; CHECK-NOT: @llvm.compiler.used
; CHECK: @llvm.used = appending global [1 x i8*] [i8* bitcast (void ()* @foo to i8*)], section "llvm.metadata"
; CHECK-NOT: @llvm.compiler.used