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Verifier: Don't crash on null entries in debug info retained types list 

There was already a good error path for this. Added a test for it & made
a minor code change to ensure the error path was actually reached,
rather than crashing before we got that far.

llvm-svn: 245795
This commit is contained in:
David Blaikie 2015-08-22 22:36:40 +00:00
parent cd31b85c12
commit 3c338f3a7e
2 changed files with 11 additions and 1 deletions
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2
llvm/lib/IR/Verifier.cpp
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@ -3782,7 +3782,7 @@ void Verifier::verifyTypeRefs() {
for (auto *CU : CUs->operands())
if (auto Ts = cast<DICompileUnit>(CU)->getRetainedTypes())
for (DIType *Op : Ts)
if (auto *T = dyn_cast<DICompositeType>(Op))
if (auto *T = dyn_cast_or_null<DICompositeType>(Op))
if (auto *S = T->getRawIdentifier()) {
UnresolvedTypeRefs.erase(S);
TypeRefs.insert(std::make_pair(S, T));

10
llvm/test/Verifier/dbg-null-retained-type.ll Normal file
View File

@ -0,0 +1,10 @@
; RUN: not llvm-as -disable-output <%s 2>&1 | FileCheck %s
; CHECK: assembly parsed, but does not verify
; CHECK-NEXT: invalid retained type
!llvm.module.flags = !{!0}
!0 = !{i32 2, !"Debug Info Version", i32 3}
!llvm.dbg.cu = !{!1}
!1 = distinct !DICompileUnit(file: !2, language: DW_LANG_C99, retainedTypes: !3)
!2 = !DIFile(filename: "file.c", directory: "/path/to/dir")
!3 = !{null}