1 | //=== MC/MCRegisterInfo.cpp - Target Register Description -------*- C++ -*-===// |
2 | // |
3 | // The LLVM Compiler Infrastructure |
4 | // |
5 | // This file is distributed under the University of Illinois Open Source |
6 | // License. See LICENSE.TXT for details. |
7 | // |
8 | //===----------------------------------------------------------------------===// |
9 | // |
10 | // This file implements MCRegisterInfo functions. |
11 | // |
12 | //===----------------------------------------------------------------------===// |
13 | |
14 | /* Capstone Disassembly Engine */ |
15 | /* By Nguyen Anh Quynh <aquynh@gmail.com>, 2013-2014 */ |
16 | |
17 | #include "MCRegisterInfo.h" |
18 | |
19 | /// DiffListIterator - Base iterator class that can traverse the |
20 | /// differentially encoded register and regunit lists in DiffLists. |
21 | /// Don't use this class directly, use one of the specialized sub-classes |
22 | /// defined below. |
23 | typedef struct DiffListIterator { |
24 | uint16_t Val; |
25 | const MCPhysReg *List; |
26 | } DiffListIterator; |
27 | |
28 | void MCRegisterInfo_InitMCRegisterInfo(MCRegisterInfo *RI, |
29 | const MCRegisterDesc *D, unsigned NR, |
30 | unsigned RA, unsigned PC, |
31 | const MCRegisterClass *C, unsigned NC, |
32 | uint16_t (*RURoots)[2], unsigned NRU, |
33 | const MCPhysReg *DL, |
34 | const char *Strings, |
35 | const uint16_t *SubIndices, unsigned NumIndices, |
36 | const uint16_t *RET) |
37 | { |
38 | RI->Desc = D; |
39 | RI->NumRegs = NR; |
40 | RI->RAReg = RA; |
41 | RI->PCReg = PC; |
42 | RI->Classes = C; |
43 | RI->DiffLists = DL; |
44 | RI->RegStrings = Strings; |
45 | RI->NumClasses = NC; |
46 | RI->RegUnitRoots = RURoots; |
47 | RI->NumRegUnits = NRU; |
48 | RI->SubRegIndices = SubIndices; |
49 | RI->NumSubRegIndices = NumIndices; |
50 | RI->RegEncodingTable = RET; |
51 | } |
52 | |
53 | static void DiffListIterator_init(DiffListIterator *d, MCPhysReg InitVal, const MCPhysReg *DiffList) |
54 | { |
55 | d->Val = InitVal; |
56 | d->List = DiffList; |
57 | } |
58 | |
59 | static uint16_t DiffListIterator_getVal(DiffListIterator *d) |
60 | { |
61 | return d->Val; |
62 | } |
63 | |
64 | static bool DiffListIterator_next(DiffListIterator *d) |
65 | { |
66 | MCPhysReg D; |
67 | |
68 | if (d->List == 0) |
69 | return false; |
70 | |
71 | D = *d->List; |
72 | d->List++; |
73 | d->Val += D; |
74 | |
75 | if (!D) |
76 | d->List = 0; |
77 | |
78 | return (D != 0); |
79 | } |
80 | |
81 | static bool DiffListIterator_isValid(DiffListIterator *d) |
82 | { |
83 | return (d->List != 0); |
84 | } |
85 | |
86 | unsigned MCRegisterInfo_getMatchingSuperReg(const MCRegisterInfo *RI, unsigned Reg, unsigned SubIdx, const MCRegisterClass *RC) |
87 | { |
88 | DiffListIterator iter; |
89 | |
90 | if (Reg >= RI->NumRegs) { |
91 | return 0; |
92 | } |
93 | |
94 | DiffListIterator_init(&iter, (MCPhysReg)Reg, RI->DiffLists + RI->Desc[Reg].SuperRegs); |
95 | DiffListIterator_next(&iter); |
96 | |
97 | while(DiffListIterator_isValid(&iter)) { |
98 | uint16_t val = DiffListIterator_getVal(&iter); |
99 | if (MCRegisterClass_contains(RC, val) && Reg == MCRegisterInfo_getSubReg(RI, val, SubIdx)) |
100 | return val; |
101 | |
102 | DiffListIterator_next(&iter); |
103 | } |
104 | |
105 | return 0; |
106 | } |
107 | |
108 | unsigned MCRegisterInfo_getSubReg(const MCRegisterInfo *RI, unsigned Reg, unsigned Idx) |
109 | { |
110 | DiffListIterator iter; |
111 | const uint16_t *SRI = RI->SubRegIndices + RI->Desc[Reg].SubRegIndices; |
112 | |
113 | DiffListIterator_init(&iter, (MCPhysReg)Reg, RI->DiffLists + RI->Desc[Reg].SubRegs); |
114 | DiffListIterator_next(&iter); |
115 | |
116 | while(DiffListIterator_isValid(&iter)) { |
117 | if (*SRI == Idx) |
118 | return DiffListIterator_getVal(&iter); |
119 | DiffListIterator_next(&iter); |
120 | ++SRI; |
121 | } |
122 | |
123 | return 0; |
124 | } |
125 | |
126 | const MCRegisterClass* MCRegisterInfo_getRegClass(const MCRegisterInfo *RI, unsigned i) |
127 | { |
128 | //assert(i < getNumRegClasses() && "Register Class ID out of range"); |
129 | if (i >= RI->NumClasses) |
130 | return 0; |
131 | return &(RI->Classes[i]); |
132 | } |
133 | |
134 | bool MCRegisterClass_contains(const MCRegisterClass *c, unsigned Reg) |
135 | { |
136 | unsigned InByte = Reg % 8; |
137 | unsigned Byte = Reg / 8; |
138 | |
139 | if (Byte >= c->RegSetSize) |
140 | return false; |
141 | |
142 | return (c->RegSet[Byte] & (1 << InByte)) != 0; |
143 | } |
144 | |