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[asan] don't unpoison redzones on function exit in use-after-return mode.
Summary: Before this change the instrumented code before Ret instructions looked like: <Unpoison Frame Redzones> if (Frame != OriginalFrame) // I.e. Frame is fake <Poison Complete Frame> Now the instrumented code looks like: if (Frame != OriginalFrame) // I.e. Frame is fake <Poison Complete Frame> else <Unpoison Frame Redzones> Reviewers: eugenis Reviewed By: eugenis CC: llvm-commits Differential Revision: http://llvm-reviews.chandlerc.com/D2458 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197907 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -670,6 +670,39 @@ TerminatorInst *llvm::SplitBlockAndInsertIfThen(Value *Cond,
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return CheckTerm;
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}
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/// SplitBlockAndInsertIfThenElse is similar to SplitBlockAndInsertIfThen,
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/// but also creates the ElseBlock.
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/// Before:
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/// Head
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/// SplitBefore
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/// Tail
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/// After:
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/// Head
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/// if (Cond)
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/// ThenBlock
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/// else
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/// ElseBlock
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/// SplitBefore
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/// Tail
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void llvm::SplitBlockAndInsertIfThenElse(Value *Cond, Instruction *SplitBefore,
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TerminatorInst **ThenTerm,
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TerminatorInst **ElseTerm,
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MDNode *BranchWeights) {
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BasicBlock *Head = SplitBefore->getParent();
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BasicBlock *Tail = Head->splitBasicBlock(SplitBefore);
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TerminatorInst *HeadOldTerm = Head->getTerminator();
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LLVMContext &C = Head->getContext();
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BasicBlock *ThenBlock = BasicBlock::Create(C, "", Head->getParent(), Tail);
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BasicBlock *ElseBlock = BasicBlock::Create(C, "", Head->getParent(), Tail);
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*ThenTerm = BranchInst::Create(Tail, ThenBlock);
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*ElseTerm = BranchInst::Create(Tail, ElseBlock);
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BranchInst *HeadNewTerm =
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BranchInst::Create(/*ifTrue*/ThenBlock, /*ifFalse*/ElseBlock, Cond);
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HeadNewTerm->setMetadata(LLVMContext::MD_prof, BranchWeights);
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ReplaceInstWithInst(HeadOldTerm, HeadNewTerm);
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}
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/// GetIfCondition - Given a basic block (BB) with two predecessors,
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/// check to see if the merge at this block is due
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/// to an "if condition". If so, return the boolean condition that determines
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