From 823573a38137191678bf1c7194048ab51d39f33c Mon Sep 17 00:00:00 2001 From: Benjamin Kramer Date: Fri, 17 Aug 2012 14:16:37 +0000 Subject: Guard MemoryBuiltins against self-looping GEPs, which can occur in unreachable code due to constant propagation. Fixes PR13621. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162098 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Analysis/MemoryBuiltins.cpp | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'lib/Analysis/MemoryBuiltins.cpp') diff --git a/lib/Analysis/MemoryBuiltins.cpp b/lib/Analysis/MemoryBuiltins.cpp index c0cc27b6ec..e77d2ff9e4 100644 --- a/lib/Analysis/MemoryBuiltins.cpp +++ b/lib/Analysis/MemoryBuiltins.cpp @@ -473,6 +473,10 @@ ObjectSizeOffsetVisitor::visitExtractValueInst(ExtractValueInst&) { } SizeOffsetType ObjectSizeOffsetVisitor::visitGEPOperator(GEPOperator &GEP) { + // Ignore self-referencing GEPs, they can occur in unreachable code. + if (&GEP == GEP.getPointerOperand()) + return unknown(); + SizeOffsetType PtrData = compute(GEP.getPointerOperand()); if (!bothKnown(PtrData) || !GEP.hasAllConstantIndices()) return unknown(); -- cgit v1.2.3-70-g09d2