1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
| //===-- X86RegisterInfo.h - X86 Register Information Impl -------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains the X86 implementation of the TargetRegisterInfo class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_X86_X86REGISTERINFO_H
#define LLVM_LIB_TARGET_X86_X86REGISTERINFO_H
#include "llvm/CodeGen/TargetRegisterInfo.h"
#define GET_REGINFO_HEADER
#include "X86GenRegisterInfo.inc"
namespace llvm {
class Triple;
class X86RegisterInfo final : public X86GenRegisterInfo {
private:
/// Is64Bit - Is the target 64-bits.
///
bool Is64Bit;
/// IsWin64 - Is the target on of win64 flavours
///
bool IsWin64;
/// SlotSize - Stack slot size in bytes.
///
unsigned SlotSize;
/// StackPtr - X86 physical register used as stack ptr.
///
unsigned StackPtr;
/// FramePtr - X86 physical register used as frame ptr.
///
unsigned FramePtr;
/// BasePtr - X86 physical register used as a base ptr in complex stack
/// frames. I.e., when we need a 3rd base, not just SP and FP, due to
/// variable size stack objects.
unsigned BasePtr;
public:
explicit X86RegisterInfo(const Triple &TT);
// FIXME: This should be tablegen'd like getDwarfRegNum is
int getSEHRegNum(unsigned i) const;
/// Code Generation virtual methods...
///
bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const override;
/// getMatchingSuperRegClass - Return a subclass of the specified register
/// class A so that each register in it has a sub-register of the
/// specified sub-register index which is in the specified register class B.
const TargetRegisterClass *
getMatchingSuperRegClass(const TargetRegisterClass *A,
const TargetRegisterClass *B,
unsigned Idx) const override;
const TargetRegisterClass *
getSubClassWithSubReg(const TargetRegisterClass *RC,
unsigned Idx) const override;
const TargetRegisterClass *
getLargestLegalSuperClass(const TargetRegisterClass *RC,
const MachineFunction &MF) const override;
bool shouldRewriteCopySrc(const TargetRegisterClass *DefRC,
unsigned DefSubReg,
const TargetRegisterClass *SrcRC,
unsigned SrcSubReg) const override;
/// getPointerRegClass - Returns a TargetRegisterClass used for pointer
/// values.
const TargetRegisterClass *
getPointerRegClass(const MachineFunction &MF,
unsigned Kind = 0) const override;
/// getCrossCopyRegClass - Returns a legal register class to copy a register
/// in the specified class to or from. Returns NULL if it is possible to copy
/// between a two registers of the specified class.
const TargetRegisterClass *
getCrossCopyRegClass(const TargetRegisterClass *RC) const override;
/// getGPRsForTailCall - Returns a register class with registers that can be
/// used in forming tail calls.
const TargetRegisterClass *
getGPRsForTailCall(const MachineFunction &MF) const;
unsigned getRegPressureLimit(const TargetRegisterClass *RC,
MachineFunction &MF) const override;
/// getCalleeSavedRegs - Return a null-terminated list of all of the
/// callee-save registers on this target.
const MCPhysReg *
getCalleeSavedRegs(const MachineFunction* MF) const override;
const MCPhysReg *
getCalleeSavedRegsViaCopy(const MachineFunction *MF) const;
const uint32_t *getCallPreservedMask(const MachineFunction &MF,
CallingConv::ID) const override;
const uint32_t *getNoPreservedMask() const override;
// Calls involved in thread-local variable lookup save more registers than
// normal calls, so they need a different mask to represent this.
const uint32_t *getDarwinTLSCallPreservedMask() const;
/// getReservedRegs - Returns a bitset indexed by physical register number
/// indicating if a register is a special register that has particular uses and
/// should be considered unavailable at all times, e.g. SP, RA. This is used by
/// register scavenger to determine what registers are free.
BitVector getReservedRegs(const MachineFunction &MF) const override;
void adjustStackMapLiveOutMask(uint32_t *Mask) const override;
bool hasBasePointer(const MachineFunction &MF) const;
bool canRealignStack(const MachineFunction &MF) const override;
bool hasReservedSpillSlot(const MachineFunction &MF, unsigned Reg,
int &FrameIdx) const override;
void eliminateFrameIndex(MachineBasicBlock::iterator MI,
int SPAdj, unsigned FIOperandNum,
RegScavenger *RS = nullptr) const override;
// Debug information queries.
Register getFrameRegister(const MachineFunction &MF) const override;
unsigned getPtrSizedFrameRegister(const MachineFunction &MF) const;
unsigned getPtrSizedStackRegister(const MachineFunction &MF) const;
Register getStackRegister() const { return StackPtr; }
Register getBaseRegister() const { return BasePtr; }
/// Returns physical register used as frame pointer.
/// This will always returns the frame pointer register, contrary to
/// getFrameRegister() which returns the "base pointer" in situations
/// involving a stack, frame and base pointer.
Register getFramePtr() const { return FramePtr; }
// FIXME: Move to FrameInfok
unsigned getSlotSize() const { return SlotSize; }
};
} // End llvm namespace
#endif
|