From 3baa72af7d65c3d5199b3d57bfa2b6c1268306b2 Mon Sep 17 00:00:00 2001 From: Peter Collingbourne Date: Thu, 2 Mar 2017 23:10:17 +0000 Subject: ThinLTOBitcodeWriter: Do not follow operand edges of type GlobalValue when looking for virtual functions. Such edges may otherwise result in infinite recursion if a pointer to a vtable is reachable from the vtable itself. This can happen in practice if a TU defines the ABI types used to implement RTTI, and is itself compiled with RTTI. Fixes PR32121. llvm-svn: 296839 --- llvm/test/Transforms/ThinLTOBitcodeWriter/circular-reference.ll | 9 +++++++++ 1 file changed, 9 insertions(+) create mode 100644 llvm/test/Transforms/ThinLTOBitcodeWriter/circular-reference.ll (limited to 'llvm/test/Transforms/ThinLTOBitcodeWriter') diff --git a/llvm/test/Transforms/ThinLTOBitcodeWriter/circular-reference.ll b/llvm/test/Transforms/ThinLTOBitcodeWriter/circular-reference.ll new file mode 100644 index 00000000000..eeda7932449 --- /dev/null +++ b/llvm/test/Transforms/ThinLTOBitcodeWriter/circular-reference.ll @@ -0,0 +1,9 @@ +; RUN: opt -thinlto-bc -o %t %s +; RUN: llvm-modextract -b -n 0 -o - %t | llvm-dis | FileCheck --check-prefix=M0 %s +; RUN: llvm-modextract -b -n 1 -o - %t | llvm-dis | FileCheck --check-prefix=M1 %s + +; M0: @g = external constant +; M1: @g = constant +@g = constant i8* bitcast (i8** @g to i8*), !type !0 + +!0 = !{i32 0, !"typeid"} -- cgit v1.2.3