1 //===-- AlphaISelLowering.h - Alpha DAG Lowering Interface ------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Andrew Lenharth and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the interfaces that Alpha uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H
16 #define LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H
18 #include "llvm/Target/TargetLowering.h"
19 #include "llvm/CodeGen/SelectionDAG.h"
26 // Start the numbering where the builting ops and target ops leave off.
27 FIRST_NUMBER = ISD::BUILTIN_OP_END+Alpha::INSTRUCTION_LIST_END,
31 class AlphaTargetLowering : public TargetLowering {
32 int VarArgsOffset; // What is the offset to the first vaarg
33 int VarArgsBase; // What is the base FrameIndex
34 unsigned GP; //GOT vreg
35 unsigned RA; //Return Address
37 AlphaTargetLowering(TargetMachine &TM);
39 /// LowerArguments - This hook must be implemented to indicate how we should
40 /// lower the arguments for the specified function, into the specified DAG.
41 virtual std::vector<SDOperand>
42 LowerArguments(Function &F, SelectionDAG &DAG);
44 /// LowerCallTo - This hook lowers an abstract call to a function into an
46 virtual std::pair<SDOperand, SDOperand>
47 LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg, unsigned CC,
48 bool isTailCall, SDOperand Callee, ArgListTy &Args,
51 virtual SDOperand LowerVAStart(SDOperand Chain, SDOperand VAListP,
52 Value *VAListV, SelectionDAG &DAG);
53 virtual SDOperand LowerVACopy(SDOperand Chain, SDOperand SrcP, Value *SrcV,
54 SDOperand DestP, Value *DestV,
56 virtual std::pair<SDOperand,SDOperand>
57 LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
58 const Type *ArgTy, SelectionDAG &DAG);
60 void restoreGP(MachineBasicBlock* BB);
61 void restoreRA(MachineBasicBlock* BB);
62 unsigned getVRegGP() { return GP; }
63 unsigned getVRegRA() { return RA; }
67 #endif // LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H