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[stackprotector] Refactor out the end of isInTailCallPosition into the function returnTypeIsEligibleForTailCall.
This allows me to use returnTypeIsEligibleForTailCall in the stack protector pass. rdar://13935163 llvm-svn: 188765
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@ -26,6 +26,7 @@ namespace llvm {
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class GlobalVariable;
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class TargetLowering;
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class TargetLoweringBase;
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class SDNode;
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class SDValue;
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class SelectionDAG;
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@ -88,6 +89,14 @@ ISD::CondCode getICmpCondCode(ICmpInst::Predicate Pred);
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/// This function only tests target-independent requirements.
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bool isInTailCallPosition(ImmutableCallSite CS, const TargetLowering &TLI);
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/// Test if given that the input instruction is in the tail call position if the
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/// return type or any attributes of the function will inhibit tail call
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/// optimization.
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bool returnTypeIsEligibleForTailCall(const Function *F,
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const Instruction *I,
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const ReturnInst *Ret,
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const TargetLoweringBase &TLI);
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} // End llvm namespace
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#endif
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@ -510,6 +510,13 @@ bool llvm::isInTailCallPosition(ImmutableCallSite CS,
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return false;
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}
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return returnTypeIsEligibleForTailCall(ExitBB->getParent(), I, Ret, TLI);
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}
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bool llvm::returnTypeIsEligibleForTailCall(const Function *F,
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const Instruction *I,
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const ReturnInst *Ret,
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const TargetLoweringBase &TLI) {
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// If the block ends with a void return or unreachable, it doesn't matter
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// what the call's return type is.
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if (!Ret || Ret->getNumOperands() == 0) return true;
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@ -519,7 +526,7 @@ bool llvm::isInTailCallPosition(ImmutableCallSite CS,
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if (isa<UndefValue>(Ret->getOperand(0))) return true;
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// Make sure the attributes attached to each return are compatible.
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AttrBuilder CallerAttrs(ExitBB->getParent()->getAttributes(),
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AttrBuilder CallerAttrs(F->getAttributes(),
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AttributeSet::ReturnIndex);
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AttrBuilder CalleeAttrs(cast<CallInst>(I)->getAttributes(),
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AttributeSet::ReturnIndex);
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