From 561334a81fc14a15388e94d05aea3c6232620374 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Mon, 15 Mar 2010 20:39:00 +0000 Subject: Implement support for the case when a reference to a addr-of-bb label is generated, but then the block is deleted. Since the value is undefined, we just emit the label right after the entry label of the function. It might matter that the label is in the same section as the function was afterall. llvm-svn: 98579 --- llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp') diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp index 63b05365d1c..fe78b23debd 100644 --- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp +++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp @@ -307,6 +307,16 @@ void AsmPrinter::EmitFunctionHeader() { // do their wild and crazy things as required. EmitFunctionEntryLabel(); + // If the function had address-taken blocks that got deleted, then we have + // references to the dangling symbols. Emit them at the start of the function + // so that we don't get references to undefined symbols. + std::vector DeadBlockSyms; + MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms); + for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) { + OutStreamer.AddComment("Address taken block that was later removed"); + OutStreamer.EmitLabel(DeadBlockSyms[i]); + } + // Add some workaround for linkonce linkage on Cygwin\MinGW. if (MAI->getLinkOnceDirective() != 0 && (F->hasLinkOnceLinkage() || F->hasWeakLinkage())) -- cgit v1.2.3