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Add interfaces to lower varargs and return/frame address intrinsics.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19406 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -172,6 +172,37 @@ public:
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virtual std::pair<SDOperand, SDOperand>
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LowerCallTo(SDOperand Chain, const Type *RetTy, SDOperand Callee,
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ArgListTy &Args, SelectionDAG &DAG) = 0;
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/// LowerVAStart - This lowers the llvm.va_start intrinsic. If not
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/// implemented, this method prints a message and aborts.
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virtual std::pair<SDOperand, SDOperand>
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LowerVAStart(SDOperand Chain, SelectionDAG &DAG);
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/// LowerVAEnd - This lowers llvm.va_end and returns the resultant chain. If
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/// not implemented, this defaults to a noop.
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virtual SDOperand LowerVAEnd(SDOperand Chain, SDOperand L, SelectionDAG &DAG);
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/// LowerVACopy - This lowers llvm.va_copy and returns the resultant
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/// value/chain pair. If not implemented, this defaults to returning the
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/// input operand.
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virtual std::pair<SDOperand,SDOperand>
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LowerVACopy(SDOperand Chain, SDOperand L, SelectionDAG &DAG);
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/// LowerVAArgNext - This lowers the vaarg and vanext instructions (depending
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/// on whether the first argument is true). If not implemented, this prints a
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/// message and aborts.
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virtual std::pair<SDOperand,SDOperand>
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LowerVAArgNext(bool isVANext, SDOperand Chain, SDOperand VAList,
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const Type *ArgTy, SelectionDAG &DAG);
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/// LowerFrameReturnAddress - This hook lowers a call to llvm.returnaddress or
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/// llvm.frameaddress (depending on the value of the first argument). The
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/// return values are the result pointer and the resultant token chain. If
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/// not implemented, both of these intrinsics will return null.
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virtual std::pair<SDOperand, SDOperand>
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LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth,
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SelectionDAG &DAG);
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};
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} // end llvm namespace
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