MipsTargetMachine.cpp revision d48cfaec3526607861ef1bd08855bd079e67a7f0 
1//===-- MipsTargetMachine.cpp - Define TargetMachine 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// Implements the info about Mips target spec.
11//
12//===----------------------------------------------------------------------===//
13
14#include "Mips.h"
15#include "MipsMCAsmInfo.h"
16#include "MipsTargetMachine.h"
17#include "llvm/PassManager.h"
18#include "llvm/Target/TargetRegistry.h"
19using namespace llvm;
20
21extern "C" void LLVMInitializeMipsTarget() {
22  // Register the target.
23  RegisterTargetMachine<MipsTargetMachine> X(TheMipsTarget);
24  RegisterTargetMachine<MipselTargetMachine> Y(TheMipselTarget);
25  RegisterAsmInfo<MipsMCAsmInfo> A(TheMipsTarget);
26  RegisterAsmInfo<MipsMCAsmInfo> B(TheMipselTarget);
27}
28
29// DataLayout --> Big-endian, 32-bit pointer/ABI/alignment
30// The stack is always 8 byte aligned
31// On function prologue, the stack is created by decrementing
32// its pointer. Once decremented, all references are done with positive
33// offset from the stack/frame pointer, using StackGrowsUp enables
34// an easier handling.
35// Using CodeModel::Large enables different CALL behavior.
36MipsTargetMachine::
37MipsTargetMachine(const Target &T, const std::string &TT, const std::string &FS,
38                  bool isLittle=false):
39  LLVMTargetMachine(T, TT),
40  Subtarget(TT, FS, isLittle),
41  DataLayout(isLittle ?
42             std::string("e-p:32:32:32-i8:8:32-i16:16:32-i64:64:64-n32") :
43             std::string("E-p:32:32:32-i8:8:32-i16:16:32-i64:64:64-n32")),
44  InstrInfo(*this),
45  FrameLowering(Subtarget),
46  TLInfo(*this), TSInfo(*this) {
47  // Abicall enables PIC by default
48  if (getRelocationModel() == Reloc::Default) {
49    if (Subtarget.isABI_O32())
50      setRelocationModel(Reloc::PIC_);
51    else
52      setRelocationModel(Reloc::Static);
53  }
54}
55
56MipselTargetMachine::
57MipselTargetMachine(const Target &T, const std::string &TT,
58                    const std::string &FS) :
59  MipsTargetMachine(T, TT, FS, true) {}
60
61// Install an instruction selector pass using
62// the ISelDag to gen Mips code.
63bool MipsTargetMachine::
64addInstSelector(PassManagerBase &PM, CodeGenOpt::Level OptLevel)
65{
66  PM.add(createMipsISelDag(*this));
67  return false;
68}
69
70// Implemented by targets that want to run passes immediately before
71// machine code is emitted. return true if -print-machineinstrs should
72// print out the code after the passes.
73bool MipsTargetMachine::
74addPreEmitPass(PassManagerBase &PM, CodeGenOpt::Level OptLevel)
75{
76  PM.add(createMipsDelaySlotFillerPass(*this));
77  return true;
78}
79
80bool MipsTargetMachine::
81addPreRegAlloc(PassManagerBase &PM, CodeGenOpt::Level OptLevel) {
82  PM.add(createMipsEmitGPRestorePass(*this));
83  return true;
84}
85
86bool MipsTargetMachine::
87addPostRegAlloc(PassManagerBase &PM, CodeGenOpt::Level OptLevel) {
88  PM.add(createMipsExpandPseudoPass(*this));
89  return true;
90}
91