MCRegisterInfo.cpp revision 239462 
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
16using namespace llvm;
17
18unsigned 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
26unsigned MCRegisterInfo::getSubReg(unsigned Reg, unsigned Idx) const {
27  // Get a pointer to the corresponding SubRegIndices list. This list has the
28  // name of each sub-register in the same order as MCSubRegIterator.
29  const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices;
30  for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI)
31    if (*SRI == Idx)
32      return *Subs;
33  return 0;
34}
35
36unsigned MCRegisterInfo::getSubRegIndex(unsigned Reg, unsigned SubReg) const {
37  // Get a pointer to the corresponding SubRegIndices list. This list has the
38  // name of each sub-register in the same order as MCSubRegIterator.
39  const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices;
40  for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI)
41    if (*Subs == SubReg)
42      return *SRI;
43  return 0;
44}
45
46int MCRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
47  const DwarfLLVMRegPair *M = isEH ? EHL2DwarfRegs : L2DwarfRegs;
48  unsigned Size = isEH ? EHL2DwarfRegsSize : L2DwarfRegsSize;
49
50  DwarfLLVMRegPair Key = { RegNum, 0 };
51  const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
52  if (I == M+Size || I->FromReg != RegNum)
53    return -1;
54  return I->ToReg;
55}
56
57int MCRegisterInfo::getLLVMRegNum(unsigned RegNum, bool isEH) const {
58  const DwarfLLVMRegPair *M = isEH ? EHDwarf2LRegs : Dwarf2LRegs;
59  unsigned Size = isEH ? EHDwarf2LRegsSize : Dwarf2LRegsSize;
60
61  DwarfLLVMRegPair Key = { RegNum, 0 };
62  const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
63  assert(I != M+Size && I->FromReg == RegNum && "Invalid RegNum");
64  return I->ToReg;
65}
66
67int MCRegisterInfo::getSEHRegNum(unsigned RegNum) const {
68  const DenseMap<unsigned, int>::const_iterator I = L2SEHRegs.find(RegNum);
69  if (I == L2SEHRegs.end()) return (int)RegNum;
70  return I->second;
71}
72