xref: /freebsd/contrib/llvm-project/llvm/lib/Target/SystemZ/SystemZMachineFunctionInfo.h (revision b891f61ef538a4e9b4658b4b756635c8036a5788)
1 //=== SystemZMachineFunctionInfo.h - SystemZ machine function info -*- C++ -*-//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZMACHINEFUNCTIONINFO_H
10 #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZMACHINEFUNCTIONINFO_H
11 
12 #include "llvm/CodeGen/MachineFunction.h"
13 
14 namespace llvm {
15 
16 namespace SystemZ {
17 // A struct to hold the low and high GPR registers to be saved/restored as
18 // well as the offset into the register save area of the low register.
19 struct GPRRegs {
20   unsigned LowGPR;
21   unsigned HighGPR;
22   unsigned GPROffset;
23   GPRRegs() : LowGPR(0), HighGPR(0), GPROffset(0) {}
24   };
25 }
26 
27 class SystemZMachineFunctionInfo : public MachineFunctionInfo {
28   virtual void anchor();
29 
30   /// Size of expected parameter area for current function. (Fixed args only).
31   unsigned SizeOfFnParams;
32 
33   SystemZ::GPRRegs SpillGPRRegs;
34   SystemZ::GPRRegs RestoreGPRRegs;
35   Register VarArgsFirstGPR;
36   Register VarArgsFirstFPR;
37   unsigned VarArgsFrameIndex;
38   unsigned RegSaveFrameIndex;
39   int FramePointerSaveIndex;
40   unsigned NumLocalDynamics;
41   /// z/OS XPLINK ABI: incoming ADA virtual register.
42   Register VRegADA;
43 
44 public:
45   SystemZMachineFunctionInfo(const Function &F, const TargetSubtargetInfo *STI)
46       : SizeOfFnParams(0), VarArgsFirstGPR(0), VarArgsFirstFPR(0),
47         VarArgsFrameIndex(0), RegSaveFrameIndex(0), FramePointerSaveIndex(0),
48         NumLocalDynamics(0) {}
49 
50   MachineFunctionInfo *
51   clone(BumpPtrAllocator &Allocator, MachineFunction &DestMF,
52         const DenseMap<MachineBasicBlock *, MachineBasicBlock *> &Src2DstMBB)
53       const override;
54 
55   // z/OS: Get and set the size of the expected parameter area for the
56   // current function. (ie. Size of param area in caller).
57   unsigned getSizeOfFnParams() const { return SizeOfFnParams; }
58   void setSizeOfFnParams(unsigned Size) { SizeOfFnParams = Size; }
59 
60   // Get and set the first and last call-saved GPR that should be saved by
61   // this function and the SP offset for the STMG.  These are 0 if no GPRs
62   // need to be saved or restored.
63   SystemZ::GPRRegs getSpillGPRRegs() const { return SpillGPRRegs; }
64   void setSpillGPRRegs(Register Low, Register High, unsigned Offs) {
65     SpillGPRRegs.LowGPR = Low;
66     SpillGPRRegs.HighGPR = High;
67     SpillGPRRegs.GPROffset = Offs;
68   }
69 
70   // Get and set the first and last call-saved GPR that should be restored by
71   // this function and the SP offset for the LMG.  These are 0 if no GPRs
72   // need to be saved or restored.
73   SystemZ::GPRRegs getRestoreGPRRegs() const { return RestoreGPRRegs; }
74   void setRestoreGPRRegs(Register Low, Register High, unsigned Offs) {
75     RestoreGPRRegs.LowGPR = Low;
76     RestoreGPRRegs.HighGPR = High;
77     RestoreGPRRegs.GPROffset = Offs;
78   }
79 
80   // Get and set the number of fixed (as opposed to variable) arguments
81   // that are passed in GPRs to this function.
82   Register getVarArgsFirstGPR() const { return VarArgsFirstGPR; }
83   void setVarArgsFirstGPR(Register GPR) { VarArgsFirstGPR = GPR; }
84 
85   // Likewise FPRs.
86   Register getVarArgsFirstFPR() const { return VarArgsFirstFPR; }
87   void setVarArgsFirstFPR(Register FPR) { VarArgsFirstFPR = FPR; }
88 
89   // Get and set the frame index of the first stack vararg.
90   unsigned getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
91   void setVarArgsFrameIndex(unsigned FI) { VarArgsFrameIndex = FI; }
92 
93   // Get and set the frame index of the register save area
94   // (i.e. the incoming stack pointer).
95   unsigned getRegSaveFrameIndex() const { return RegSaveFrameIndex; }
96   void setRegSaveFrameIndex(unsigned FI) { RegSaveFrameIndex = FI; }
97 
98   // Get and set the frame index of where the old frame pointer is stored.
99   int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
100   void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
101 
102   // Count number of local-dynamic TLS symbols used.
103   unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; }
104   void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; }
105 
106   // Get and set the function's incoming special XPLINK ABI defined ADA
107   // register.
108   Register getADAVirtualRegister() const { return VRegADA; }
109   void setADAVirtualRegister(Register Reg) { VRegADA = Reg; }
110 };
111 
112 } // end namespace llvm
113 
114 #endif
115