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 #include "llvm/MC/MCRegisterInfo.h"
15
16 using namespace llvm;
17
getMatchingSuperReg(unsigned Reg,unsigned SubIdx,const MCRegisterClass * RC) const18 unsigned MCRegisterInfo::getMatchingSuperReg(unsigned Reg, unsigned SubIdx,
19 const MCRegisterClass *RC) const {
20 for (MCSuperRegIterator Supers(Reg, this); Supers.isValid(); ++Supers)
21 if (RC->contains(*Supers) && Reg == getSubReg(*Supers, SubIdx))
22 return *Supers;
23 return 0;
24 }
25
getSubReg(unsigned Reg,unsigned Idx) const26 unsigned MCRegisterInfo::getSubReg(unsigned Reg, unsigned Idx) const {
27 assert(Idx && Idx < getNumSubRegIndices() &&
28 "This is not a subregister index");
29 // Get a pointer to the corresponding SubRegIndices list. This list has the
30 // name of each sub-register in the same order as MCSubRegIterator.
31 const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices;
32 for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI)
33 if (*SRI == Idx)
34 return *Subs;
35 return 0;
36 }
37
getSubRegIndex(unsigned Reg,unsigned SubReg) const38 unsigned MCRegisterInfo::getSubRegIndex(unsigned Reg, unsigned SubReg) const {
39 assert(SubReg && SubReg < getNumRegs() && "This is not a register");
40 // Get a pointer to the corresponding SubRegIndices list. This list has the
41 // name of each sub-register in the same order as MCSubRegIterator.
42 const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices;
43 for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI)
44 if (*Subs == SubReg)
45 return *SRI;
46 return 0;
47 }
48
getSubRegIdxSize(unsigned Idx) const49 unsigned MCRegisterInfo::getSubRegIdxSize(unsigned Idx) const {
50 assert(Idx && Idx < getNumSubRegIndices() &&
51 "This is not a subregister index");
52 return SubRegIdxRanges[Idx].Size;
53 }
54
getSubRegIdxOffset(unsigned Idx) const55 unsigned MCRegisterInfo::getSubRegIdxOffset(unsigned Idx) const {
56 assert(Idx && Idx < getNumSubRegIndices() &&
57 "This is not a subregister index");
58 return SubRegIdxRanges[Idx].Offset;
59 }
60
getDwarfRegNum(unsigned RegNum,bool isEH) const61 int MCRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
62 const DwarfLLVMRegPair *M = isEH ? EHL2DwarfRegs : L2DwarfRegs;
63 unsigned Size = isEH ? EHL2DwarfRegsSize : L2DwarfRegsSize;
64
65 DwarfLLVMRegPair Key = { RegNum, 0 };
66 const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
67 if (I == M+Size || I->FromReg != RegNum)
68 return -1;
69 return I->ToReg;
70 }
71
getLLVMRegNum(unsigned RegNum,bool isEH) const72 int MCRegisterInfo::getLLVMRegNum(unsigned RegNum, bool isEH) const {
73 const DwarfLLVMRegPair *M = isEH ? EHDwarf2LRegs : Dwarf2LRegs;
74 unsigned Size = isEH ? EHDwarf2LRegsSize : Dwarf2LRegsSize;
75
76 DwarfLLVMRegPair Key = { RegNum, 0 };
77 const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
78 assert(I != M+Size && I->FromReg == RegNum && "Invalid RegNum");
79 return I->ToReg;
80 }
81
getSEHRegNum(unsigned RegNum) const82 int MCRegisterInfo::getSEHRegNum(unsigned RegNum) const {
83 const DenseMap<unsigned, int>::const_iterator I = L2SEHRegs.find(RegNum);
84 if (I == L2SEHRegs.end()) return (int)RegNum;
85 return I->second;
86 }
87