1 //===---- InstrEmitter.h - Emit MachineInstrs for the SelectionDAG class ---==//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This declares the Emit routines for the SelectionDAG class, which creates
11 // MachineInstrs based on the decisions of the SelectionDAG instruction
14 //===----------------------------------------------------------------------===//
16 #ifndef INSTREMITTER_H
17 #define INSTREMITTER_H
19 #include "llvm/CodeGen/SelectionDAG.h"
20 #include "llvm/CodeGen/MachineBasicBlock.h"
21 #include "llvm/ADT/DenseMap.h"
25 class TargetInstrDesc;
30 MachineRegisterInfo *MRI;
31 const TargetMachine *TM;
32 const TargetInstrInfo *TII;
33 const TargetRegisterInfo *TRI;
34 const TargetLowering *TLI;
36 MachineBasicBlock *MBB;
37 MachineBasicBlock::iterator InsertPos;
39 /// EmitCopyFromReg - Generate machine code for an CopyFromReg node or an
40 /// implicit physical register output.
41 void EmitCopyFromReg(SDNode *Node, unsigned ResNo,
42 bool IsClone, bool IsCloned,
44 DenseMap<SDValue, unsigned> &VRBaseMap);
46 /// getDstOfCopyToRegUse - If the only use of the specified result number of
47 /// node is a CopyToReg, return its destination register. Return 0 otherwise.
48 unsigned getDstOfOnlyCopyToRegUse(SDNode *Node,
49 unsigned ResNo) const;
51 void CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
52 const TargetInstrDesc &II,
53 bool IsClone, bool IsCloned,
54 DenseMap<SDValue, unsigned> &VRBaseMap);
56 /// getVR - Return the virtual register corresponding to the specified result
57 /// of the specified node.
58 unsigned getVR(SDValue Op,
59 DenseMap<SDValue, unsigned> &VRBaseMap);
61 /// AddRegisterOperand - Add the specified register as an operand to the
62 /// specified machine instr. Insert register copies if the register is
63 /// not in the required register class.
64 void AddRegisterOperand(MachineInstr *MI, SDValue Op,
66 const TargetInstrDesc *II,
67 DenseMap<SDValue, unsigned> &VRBaseMap);
69 /// AddOperand - Add the specified operand to the specified machine instr. II
70 /// specifies the instruction information for the node, and IIOpNum is the
71 /// operand number (in the II) that we are adding. IIOpNum and II are used for
73 void AddOperand(MachineInstr *MI, SDValue Op,
75 const TargetInstrDesc *II,
76 DenseMap<SDValue, unsigned> &VRBaseMap);
78 /// EmitSubregNode - Generate machine code for subreg nodes.
80 void EmitSubregNode(SDNode *Node, DenseMap<SDValue, unsigned> &VRBaseMap);
82 /// EmitCopyToRegClassNode - Generate machine code for COPY_TO_REGCLASS nodes.
83 /// COPY_TO_REGCLASS is just a normal copy, except that the destination
84 /// register is constrained to be in a particular register class.
86 void EmitCopyToRegClassNode(SDNode *Node,
87 DenseMap<SDValue, unsigned> &VRBaseMap);
90 /// CountResults - The results of target nodes have register or immediate
91 /// operands first, then an optional chain, and optional flag operands
92 /// (which do not go into the machine instrs.)
93 static unsigned CountResults(SDNode *Node);
95 /// CountOperands - The inputs to target nodes have any actual inputs first,
96 /// followed by an optional chain operand, then flag operands. Compute
97 /// the number of actual operands that will go into the resulting
99 static unsigned CountOperands(SDNode *Node);
101 /// EmitDbgValue - Generate any debug info that refers to this Node. Constant
102 /// dbg_value is not handled here.
103 void EmitDbgValue(SDNode *Node,
104 DenseMap<SDValue, unsigned> &VRBaseMap,
108 /// EmitDbgValue - Generate a constant DBG_VALUE. No node is involved.
109 void EmitDbgValue(SDDbgValue* sd,
110 DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM);
112 /// EmitNode - Generate machine code for a node and needed dependencies.
114 void EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
115 DenseMap<SDValue, unsigned> &VRBaseMap,
116 DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM);
118 /// getBlock - Return the current basic block.
119 MachineBasicBlock *getBlock() { return MBB; }
121 /// getInsertPos - Return the current insertion position.
122 MachineBasicBlock::iterator getInsertPos() { return InsertPos; }
124 /// InstrEmitter - Construct an InstrEmitter and set it to start inserting
125 /// at the given position in the given block.
126 InstrEmitter(MachineBasicBlock *mbb, MachineBasicBlock::iterator insertpos);