MipsTargetMachine.cpp revision 5bcc8bd0c60cfe583ee47852950aad9e532c932e 
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 "MipsTargetAsmInfo.h"
16#include "MipsTargetMachine.h"
17#include "llvm/Module.h"
18#include "llvm/PassManager.h"
19#include "llvm/Target/TargetMachineRegistry.h"
20using namespace llvm;
21
22/// MipsTargetMachineModule - Note that this is used on hosts that
23/// cannot link in a library unless there are references into the
24/// library.  In particular, it seems that it is not possible to get
25/// things to work on Win32 without this.  Though it is unused, do not
26/// remove it.
27extern "C" int MipsTargetMachineModule;
28int MipsTargetMachineModule = 0;
29
30// Register the target.
31static RegisterTarget<MipsTargetMachine>    X("mips", "Mips");
32static RegisterTarget<MipselTargetMachine>  Y("mipsel", "Mipsel");
33
34MipsTargetMachine::AsmPrinterCtorFn MipsTargetMachine::AsmPrinterCtor = 0;
35
36
37// Force static initialization.
38extern "C" void LLVMInitializeMipsTarget() { }
39
40const TargetAsmInfo *MipsTargetMachine::
41createTargetAsmInfo() const
42{
43  return new MipsTargetAsmInfo(*this);
44}
45
46// DataLayout --> Big-endian, 32-bit pointer/ABI/alignment
47// The stack is always 8 byte aligned
48// On function prologue, the stack is created by decrementing
49// its pointer. Once decremented, all references are done with positive
50// offset from the stack/frame pointer, using StackGrowsUp enables
51// an easier handling.
52// Using CodeModel::Large enables different CALL behavior.
53MipsTargetMachine::
54MipsTargetMachine(const Module &M, const std::string &FS, bool isLittle=false):
55  Subtarget(*this, M, FS, isLittle),
56  DataLayout(isLittle ? std::string("e-p:32:32:32-i8:8:32-i16:16:32") :
57                        std::string("E-p:32:32:32-i8:8:32-i16:16:32")),
58  InstrInfo(*this),
59  FrameInfo(TargetFrameInfo::StackGrowsUp, 8, 0),
60  TLInfo(*this)
61{
62  // Abicall enables PIC by default
63  if (Subtarget.hasABICall())
64    setRelocationModel(Reloc::PIC_);
65
66  // TODO: create an option to enable long calls, like -mlong-calls,
67  // that would be our CodeModel::Large. It must not work with Abicall.
68  if (getCodeModel() == CodeModel::Default)
69    setCodeModel(CodeModel::Small);
70}
71
72MipselTargetMachine::
73MipselTargetMachine(const Module &M, const std::string &FS) :
74  MipsTargetMachine(M, FS, true) {}
75
76// return 0 and must specify -march to gen MIPS code.
77unsigned MipsTargetMachine::
78getModuleMatchQuality(const Module &M)
79{
80  // We strongly match "mips*-*".
81  std::string TT = M.getTargetTriple();
82  if (TT.size() >= 5 && std::string(TT.begin(), TT.begin()+5) == "mips-")
83    return 20;
84
85  if (TT.size() >= 13 && std::string(TT.begin(),
86      TT.begin()+13) == "mipsallegrex-")
87    return 20;
88
89  return 0;
90}
91
92// return 0 and must specify -march to gen MIPSEL code.
93unsigned MipselTargetMachine::
94getModuleMatchQuality(const Module &M)
95{
96  // We strongly match "mips*el-*".
97  std::string TT = M.getTargetTriple();
98  if (TT.size() >= 7 && std::string(TT.begin(), TT.begin()+7) == "mipsel-")
99    return 20;
100
101  if (TT.size() >= 15 && std::string(TT.begin(),
102      TT.begin()+15) == "mipsallegrexel-")
103    return 20;
104
105  if (TT.size() == 3 && std::string(TT.begin(), TT.begin()+3) == "psp")
106    return 20;
107
108  return 0;
109}
110
111// Install an instruction selector pass using
112// the ISelDag to gen Mips code.
113bool MipsTargetMachine::
114addInstSelector(PassManagerBase &PM, CodeGenOpt::Level OptLevel)
115{
116  PM.add(createMipsISelDag(*this));
117  return false;
118}
119
120// Implemented by targets that want to run passes immediately before
121// machine code is emitted. return true if -print-machineinstrs should
122// print out the code after the passes.
123bool MipsTargetMachine::
124addPreEmitPass(PassManagerBase &PM, CodeGenOpt::Level OptLevel)
125{
126  PM.add(createMipsDelaySlotFillerPass(*this));
127  return true;
128}
129
130// Implements the AssemblyEmitter for the target. Must return
131// true if AssemblyEmitter is supported
132bool MipsTargetMachine::
133addAssemblyEmitter(PassManagerBase &PM, CodeGenOpt::Level OptLevel,
134                   bool Verbose, raw_ostream &Out)  {
135  // Output assembly language.
136  assert(AsmPrinterCtor && "AsmPrinter was not linked in");
137  PM.add(AsmPrinterCtor(Out, *this, Verbose));
138  return false;
139}
140