SparcAsmPrinter.cpp revision 7a48e5018b10d2b4c123913b40df904bd5c66043 
1//===-- SparcV8AsmPrinter.cpp - SparcV8 LLVM assembly writer --------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file was developed by the LLVM research group and is distributed under
6// the University of Illinois Open Source License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file contains a printer that converts from our internal representation
11// of machine-dependent LLVM code to GAS-format Sparc V8 assembly language.
12//
13//===----------------------------------------------------------------------===//
14
15#include "SparcV8.h"
16#include "SparcV8InstrInfo.h"
17#include "llvm/Constants.h"
18#include "llvm/DerivedTypes.h"
19#include "llvm/Module.h"
20#include "llvm/Assembly/Writer.h"
21#include "llvm/CodeGen/AsmPrinter.h"
22#include "llvm/CodeGen/MachineFunctionPass.h"
23#include "llvm/CodeGen/MachineConstantPool.h"
24#include "llvm/CodeGen/MachineInstr.h"
25#include "llvm/Target/TargetMachine.h"
26#include "llvm/Support/Mangler.h"
27#include "llvm/ADT/Statistic.h"
28#include "llvm/ADT/StringExtras.h"
29#include "llvm/Support/CommandLine.h"
30#include "llvm/Support/MathExtras.h"
31#include <cctype>
32using namespace llvm;
33
34namespace {
35  Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
36
37  struct SparcV8AsmPrinter : public AsmPrinter {
38    SparcV8AsmPrinter(std::ostream &O, TargetMachine &TM) : AsmPrinter(O, TM) {
39      Data16bitsDirective = "\t.half\t";
40      Data32bitsDirective = "\t.word\t";
41      Data64bitsDirective = "\t.xword\t";
42      ZeroDirective = 0;  // no .zero or .space!
43      CommentString = "!";
44      ConstantPoolSection = "\t.section \".rodata\",#alloc\n";
45    }
46
47    /// We name each basic block in a Function with a unique number, so
48    /// that we can consistently refer to them later. This is cleared
49    /// at the beginning of each call to runOnMachineFunction().
50    ///
51    typedef std::map<const Value *, unsigned> ValueMapTy;
52    ValueMapTy NumberForBB;
53
54    virtual const char *getPassName() const {
55      return "SparcV8 Assembly Printer";
56    }
57
58    void printOperand(const MachineInstr *MI, int opNum);
59    void printMemOperand(const MachineInstr *MI, int opNum);
60    bool printInstruction(const MachineInstr *MI);  // autogenerated.
61    bool runOnMachineFunction(MachineFunction &F);
62    bool doInitialization(Module &M);
63    bool doFinalization(Module &M);
64  };
65} // end of anonymous namespace
66
67#include "SparcV8GenAsmWriter.inc"
68
69/// createSparcV8CodePrinterPass - Returns a pass that prints the SparcV8
70/// assembly code for a MachineFunction to the given output stream,
71/// using the given target machine description.  This should work
72/// regardless of whether the function is in SSA form.
73///
74FunctionPass *llvm::createSparcV8CodePrinterPass (std::ostream &o,
75                                                  TargetMachine &tm) {
76  return new SparcV8AsmPrinter(o, tm);
77}
78
79/// runOnMachineFunction - This uses the printMachineInstruction()
80/// method to print assembly for each instruction.
81///
82bool SparcV8AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
83  SetupMachineFunction(MF);
84
85  // Print out constants referenced by the function
86  EmitConstantPool(MF.getConstantPool());
87
88  // BBNumber is used here so that a given Printer will never give two
89  // BBs the same name. (If you have a better way, please let me know!)
90  static unsigned BBNumber = 0;
91
92  O << "\n\n";
93  // What's my mangled name?
94  CurrentFnName = Mang->getValueName(MF.getFunction());
95
96  // Print out labels for the function.
97  O << "\t.text\n";
98  O << "\t.align 16\n";
99  O << "\t.globl\t" << CurrentFnName << "\n";
100  O << "\t.type\t" << CurrentFnName << ", #function\n";
101  O << CurrentFnName << ":\n";
102
103  // Number each basic block so that we can consistently refer to them
104  // in PC-relative references.
105  NumberForBB.clear();
106  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
107       I != E; ++I) {
108    NumberForBB[I->getBasicBlock()] = BBNumber++;
109  }
110
111  // Print out code for the function.
112  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
113       I != E; ++I) {
114    // Print a label for the basic block.
115    O << ".LBB" << Mang->getValueName(MF.getFunction ())
116      << "_" << I->getNumber () << ":\t! "
117      << I->getBasicBlock ()->getName () << "\n";
118    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
119         II != E; ++II) {
120      // Print the assembly for the instruction.
121      O << "\t";
122      printInstruction(II);
123      ++EmittedInsts;
124    }
125  }
126
127  // We didn't modify anything.
128  return false;
129}
130
131void SparcV8AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
132  const MachineOperand &MO = MI->getOperand (opNum);
133  const MRegisterInfo &RI = *TM.getRegisterInfo();
134  bool CloseParen = false;
135  if (MI->getOpcode() == V8::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
136    O << "%hi(";
137    CloseParen = true;
138  } else if (MI->getOpcode() ==V8::ORri &&!MO.isRegister() &&!MO.isImmediate())
139  {
140    O << "%lo(";
141    CloseParen = true;
142  }
143  switch (MO.getType()) {
144  case MachineOperand::MO_VirtualRegister:
145    if (Value *V = MO.getVRegValueOrNull()) {
146      O << "<" << V->getName() << ">";
147      break;
148    }
149    // FALLTHROUGH
150  case MachineOperand::MO_MachineRegister:
151    if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
152      O << "%" << LowercaseString (RI.get(MO.getReg()).Name);
153    else
154      O << "%reg" << MO.getReg();
155    break;
156
157  case MachineOperand::MO_SignExtendedImmed:
158  case MachineOperand::MO_UnextendedImmed:
159    O << (int)MO.getImmedValue();
160    break;
161  case MachineOperand::MO_MachineBasicBlock: {
162    MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
163    O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction())
164      << "_" << MBBOp->getNumber () << "\t! "
165      << MBBOp->getBasicBlock ()->getName ();
166    return;
167  }
168  case MachineOperand::MO_PCRelativeDisp:
169    std::cerr << "Shouldn't use addPCDisp() when building SparcV8 MachineInstrs";
170    abort ();
171    return;
172  case MachineOperand::MO_GlobalAddress:
173    O << Mang->getValueName(MO.getGlobal());
174    break;
175  case MachineOperand::MO_ExternalSymbol:
176    O << MO.getSymbolName();
177    break;
178  case MachineOperand::MO_ConstantPoolIndex:
179    O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << "_"
180      << MO.getConstantPoolIndex();
181    break;
182  default:
183    O << "<unknown operand type>"; abort (); break;
184  }
185  if (CloseParen) O << ")";
186}
187
188void SparcV8AsmPrinter::printMemOperand(const MachineInstr *MI, int opNum) {
189  printOperand(MI, opNum);
190  MachineOperand::MachineOperandType OpTy = MI->getOperand(opNum+1).getType();
191
192  if ((OpTy == MachineOperand::MO_VirtualRegister ||
193       OpTy == MachineOperand::MO_MachineRegister) &&
194      MI->getOperand(opNum+1).getReg() == V8::G0)
195    return;   // don't print "+%g0"
196  if ((OpTy == MachineOperand::MO_SignExtendedImmed ||
197       OpTy == MachineOperand::MO_UnextendedImmed) &&
198      MI->getOperand(opNum+1).getImmedValue() == 0)
199    return;   // don't print "+0"
200
201  O << "+";
202  if (OpTy == MachineOperand::MO_GlobalAddress ||
203      OpTy == MachineOperand::MO_ConstantPoolIndex) {
204    O << "%lo(";
205    printOperand(MI, opNum+1);
206    O << ")";
207  } else {
208    printOperand(MI, opNum+1);
209  }
210}
211
212
213bool SparcV8AsmPrinter::doInitialization(Module &M) {
214  Mang = new Mangler(M);
215  return false; // success
216}
217
218bool SparcV8AsmPrinter::doFinalization(Module &M) {
219  const TargetData &TD = TM.getTargetData();
220
221  // Print out module-level global variables here.
222  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
223    if (I->hasInitializer()) {   // External global require no code
224      O << "\n\n";
225      std::string name = Mang->getValueName(I);
226      Constant *C = I->getInitializer();
227      unsigned Size = TD.getTypeSize(C->getType());
228      unsigned Align = TD.getTypeAlignment(C->getType());
229
230      if (C->isNullValue() &&
231          (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
232           I->hasWeakLinkage() /* FIXME: Verify correct */)) {
233        SwitchSection(".data", I);
234        if (I->hasInternalLinkage())
235          O << "\t.local " << name << "\n";
236
237        O << "\t.comm " << name << "," << TD.getTypeSize(C->getType())
238          << "," << (unsigned)TD.getTypeAlignment(C->getType());
239        O << "\t\t! ";
240        WriteAsOperand(O, I, true, true, &M);
241        O << "\n";
242      } else {
243        switch (I->getLinkage()) {
244        case GlobalValue::LinkOnceLinkage:
245        case GlobalValue::WeakLinkage:   // FIXME: Verify correct for weak.
246          // Nonnull linkonce -> weak
247          O << "\t.weak " << name << "\n";
248          SwitchSection("", I);
249          O << "\t.section\t\".llvm.linkonce.d." << name
250            << "\",\"aw\",@progbits\n";
251          break;
252
253        case GlobalValue::AppendingLinkage:
254          // FIXME: appending linkage variables should go into a section of
255          // their name or something.  For now, just emit them as external.
256        case GlobalValue::ExternalLinkage:
257          // If external or appending, declare as a global symbol
258          O << "\t.globl " << name << "\n";
259          // FALL THROUGH
260        case GlobalValue::InternalLinkage:
261          if (C->isNullValue())
262            SwitchSection(".bss", I);
263          else
264            SwitchSection(".data", I);
265          break;
266        case GlobalValue::GhostLinkage:
267          std::cerr << "Should not have any unmaterialized functions!\n";
268          abort();
269        }
270
271        O << "\t.align " << Align << "\n";
272        O << "\t.type " << name << ",#object\n";
273        O << "\t.size " << name << "," << Size << "\n";
274        O << name << ":\t\t\t\t! ";
275        WriteAsOperand(O, I, true, true, &M);
276        O << " = ";
277        WriteAsOperand(O, C, false, false, &M);
278        O << "\n";
279        EmitGlobalConstant(C);
280      }
281    }
282
283  AsmPrinter::doFinalization(M);
284  return false; // success
285}
286