From 66d80a9c99ef781f0fd56dfcd060e30d4d673c93 Mon Sep 17 00:00:00 2001 From: John McCall Date: Tue, 6 Jul 2010 17:35:03 +0000 Subject: When destroying a cleanup, kill any references to instructions in the entry block before deleting it. Fixes PR7575. This really just a short-term fix before implementing lazy cleanups. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@107676 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/CodeGenFunction.cpp | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'lib/CodeGen/CodeGenFunction.cpp') diff --git a/lib/CodeGen/CodeGenFunction.cpp b/lib/CodeGen/CodeGenFunction.cpp index 306989f11e..9375b77360 100644 --- a/lib/CodeGen/CodeGenFunction.cpp +++ b/lib/CodeGen/CodeGenFunction.cpp @@ -688,6 +688,12 @@ static void DestroyCleanup(CodeGenFunction &CGF, llvm::BranchInst::Create(CGF.getUnreachableBlock(), Exit); assert(!Entry->getParent() && "cleanup entry already positioned?"); + // We can't just delete the entry; we have to kill any references to + // its instructions in other blocks. + for (llvm::BasicBlock::iterator I = Entry->begin(), E = Entry->end(); + I != E; ++I) + if (!I->use_empty()) + I->replaceAllUsesWith(llvm::UndefValue::get(I->getType())); delete Entry; } -- cgit v1.2.3-18-g5258