llvm-6502/lib/Target/Blackfin/BlackfinISelLowering.h
Dan Gohman 98ca4f2a32 Major calling convention code refactoring.
Instead of awkwardly encoding calling-convention information with ISD::CALL,
ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering
provides three virtual functions for targets to override:
LowerFormalArguments, LowerCall, and LowerRet, which replace the custom
lowering done on the special nodes. They provide the same information, but
in a more immediately usable format.

This also reworks much of the target-independent tail call logic. The
decision of whether or not to perform a tail call is now cleanly split
between target-independent portions, and the target dependent portion
in IsEligibleForTailCallOptimization.

This also synchronizes all in-tree targets, to help enable future
refactoring and feature work.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-05 01:29:28 +00:00

79 lines
2.9 KiB
C++

//===- BlackfinISelLowering.h - Blackfin DAG Lowering Interface -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that Blackfin uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef BLACKFIN_ISELLOWERING_H
#define BLACKFIN_ISELLOWERING_H
#include "llvm/Target/TargetLowering.h"
#include "Blackfin.h"
namespace llvm {
namespace BFISD {
enum {
FIRST_NUMBER = ISD::BUILTIN_OP_END,
CALL, // A call instruction.
RET_FLAG, // Return with a flag operand.
Wrapper // Address wrapper
};
}
class BlackfinTargetLowering : public TargetLowering {
int VarArgsFrameOffset; // Frame offset to start of varargs area.
public:
BlackfinTargetLowering(TargetMachine &TM);
virtual MVT getSetCCResultType(MVT VT) const;
virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
int getVarArgsFrameOffset() const { return VarArgsFrameOffset; }
ConstraintType getConstraintType(const std::string &Constraint) const;
std::pair<unsigned, const TargetRegisterClass*>
getRegForInlineAsmConstraint(const std::string &Constraint, MVT VT) const;
std::vector<unsigned>
getRegClassForInlineAsmConstraint(const std::string &Constraint,
MVT VT) const;
virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
const char *getTargetNodeName(unsigned Opcode) const;
unsigned getFunctionAlignment(const Function *F) const;
private:
SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG);
SDValue LowerADDE(SDValue Op, SelectionDAG &DAG);
virtual SDValue
LowerFormalArguments(SDValue Chain,
unsigned CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals);
virtual SDValue
LowerCall(SDValue Chain, SDValue Callee,
unsigned CallConv, bool isVarArg, bool isTailCall,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals);
virtual SDValue
LowerReturn(SDValue Chain,
unsigned CallConv, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
DebugLoc dl, SelectionDAG &DAG);
};
} // end namespace llvm
#endif // BLACKFIN_ISELLOWERING_H