forked from OSchip/llvm-project
[stackprotector] Added significantly longer comment to FindPotentialTailCall to make clear its relationship to llvm::isInTailCallPosition.
llvm-svn: 188770
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@ -280,7 +280,12 @@ static bool InstructionWillNotHaveChain(const Instruction *I) {
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/// Identify if RI has a previous instruction in the "Tail Position" and return
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/// it. Otherwise return 0.
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///
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/// This is based off of the code in llvm::isInTailCallPosition
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/// This is based off of the code in llvm::isInTailCallPosition. The difference
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/// is that it inverts the first part of llvm::isInTailCallPosition since
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/// isInTailCallPosition is checking if a call is in a tail call position, and
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/// we are searching for an unknown tail call that might be in the tail call
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/// position. Once we find the call though, the code uses the same refactored
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/// code, returnTypeIsEligibleForTailCall.
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static CallInst *FindPotentialTailCall(BasicBlock *BB, ReturnInst *RI,
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const TargetLoweringBase *TLI) {
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// Establish a reasonable upper bound on the maximum amount of instructions we
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