MipsTargetMachine.cpp revision bfae83139dcb4fffd50b939e1b1224b0126f04d4 
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
22namespace {
23  // Register the target.
24  RegisterTarget<MipsTargetMachine> X("mips", "  Mips");
25}
26
27const TargetAsmInfo *MipsTargetMachine::
28createTargetAsmInfo() const
29{
30  return new MipsTargetAsmInfo(*this);
31}
32
33// DataLayout --> Big-endian, 32-bit pointer/ABI/alignment
34// The stack is always 8 byte aligned
35// On function prologue, the stack is created by decrementing
36// its pointer. Once decremented, all references are done with positive
37// offset from the stack/frame pointer, so StackGrowsUp is used.
38// When using CodeModel::Large the behaviour
39//
40//
41MipsTargetMachine::
42MipsTargetMachine(const Module &M, const std::string &FS):
43  Subtarget(*this, M, FS), DataLayout("E-p:32:32:32"),
44  InstrInfo(*this), FrameInfo(TargetFrameInfo::StackGrowsUp, 8, 0),
45  TLInfo(*this)
46{
47  if (getRelocationModel() != Reloc::Static)
48    setRelocationModel(Reloc::PIC_);
49  if (getCodeModel() == CodeModel::Default)
50    setCodeModel(CodeModel::Small);
51}
52
53// return 0 and must specify -march to gen MIPS code.
54unsigned MipsTargetMachine::
55getModuleMatchQuality(const Module &M)
56{
57  // We strongly match "mips-*".
58  std::string TT = M.getTargetTriple();
59  if (TT.size() >= 5 && std::string(TT.begin(), TT.begin()+5) == "mips-")
60    return 20;
61
62  return 0;
63}
64
65// Install an instruction selector pass using
66// the ISelDag to gen Mips code.
67bool MipsTargetMachine::
68addInstSelector(PassManagerBase &PM, bool Fast)
69{
70  PM.add(createMipsISelDag(*this));
71  return false;
72}
73
74// Implemented by targets that want to run passes immediately before
75// machine code is emitted. return true if -print-machineinstrs should
76// print out the code after the passes.
77bool MipsTargetMachine::
78addPreEmitPass(PassManagerBase &PM, bool Fast)
79{
80  PM.add(createMipsDelaySlotFillerPass(*this));
81  return true;
82}
83
84// Implements the AssemblyEmitter for the target. Must return
85// true if AssemblyEmitter is supported
86bool MipsTargetMachine::
87addAssemblyEmitter(PassManagerBase &PM, bool Fast,
88                   std::ostream &Out)
89{
90  // Output assembly language.
91  PM.add(createMipsCodePrinterPass(Out, *this));
92  return false;
93}
94