MipsMachineFunction.cpp revision 544cc21cf4807116251a699d8b1d3d4bace21597 
1//===-- MipsMachineFunctionInfo.cpp - Private data used for Mips ----------===//
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#include "MipsMachineFunction.h"
11#include "MCTargetDesc/MipsBaseInfo.h"
12#include "MipsInstrInfo.h"
13#include "MipsSubtarget.h"
14#include "llvm/CodeGen/MachineInstrBuilder.h"
15#include "llvm/CodeGen/MachineRegisterInfo.h"
16#include "llvm/IR/Function.h"
17#include "llvm/Support/CommandLine.h"
18
19using namespace llvm;
20
21static cl::opt<bool>
22FixGlobalBaseReg("mips-fix-global-base-reg", cl::Hidden, cl::init(true),
23                 cl::desc("Always use $gp as the global base register."));
24
25bool MipsFunctionInfo::globalBaseRegSet() const {
26  return GlobalBaseReg;
27}
28
29unsigned MipsFunctionInfo::getGlobalBaseReg() {
30  // Return if it has already been initialized.
31  if (GlobalBaseReg)
32    return GlobalBaseReg;
33
34  const MipsSubtarget &ST = MF.getTarget().getSubtarget<MipsSubtarget>();
35
36  const TargetRegisterClass *RC;
37  if (ST.inMips16Mode())
38    RC=(const TargetRegisterClass*)&Mips::CPU16RegsRegClass;
39  else
40    RC = ST.isABI_N64() ?
41      (const TargetRegisterClass*)&Mips::CPU64RegsRegClass :
42      (const TargetRegisterClass*)&Mips::CPURegsRegClass;
43  return GlobalBaseReg = MF.getRegInfo().createVirtualRegister(RC);
44}
45
46bool MipsFunctionInfo::mips16SPAliasRegSet() const {
47  return Mips16SPAliasReg;
48}
49unsigned MipsFunctionInfo::getMips16SPAliasReg() {
50  // Return if it has already been initialized.
51  if (Mips16SPAliasReg)
52    return Mips16SPAliasReg;
53
54  const TargetRegisterClass *RC;
55  RC=(const TargetRegisterClass*)&Mips::CPU16RegsRegClass;
56  return Mips16SPAliasReg = MF.getRegInfo().createVirtualRegister(RC);
57}
58
59void MipsFunctionInfo::createEhDataRegsFI() {
60  for (int I = 0; I < 4; ++I) {
61    const MipsSubtarget &ST = MF.getTarget().getSubtarget<MipsSubtarget>();
62    const TargetRegisterClass *RC = ST.isABI_N64() ?
63        &Mips::CPU64RegsRegClass : &Mips::CPURegsRegClass;
64
65    EhDataRegFI[I] = MF.getFrameInfo()->CreateStackObject(RC->getSize(),
66        RC->getAlignment(), false);
67  }
68}
69
70bool MipsFunctionInfo::isEhDataRegFI(int FI) const {
71  return CallsEhReturn && (FI == EhDataRegFI[0] || FI == EhDataRegFI[1]
72                        || FI == EhDataRegFI[2] || FI == EhDataRegFI[3]);
73}
74
75void MipsFunctionInfo::anchor() { }
76