SparcAsmPrinter.cpp revision 76acc872b3c63c26a83c2832ece6fa9b04786f24 
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    }
44
45    /// We name each basic block in a Function with a unique number, so
46    /// that we can consistently refer to them later. This is cleared
47    /// at the beginning of each call to runOnMachineFunction().
48    ///
49    typedef std::map<const Value *, unsigned> ValueMapTy;
50    ValueMapTy NumberForBB;
51
52    virtual const char *getPassName() const {
53      return "SparcV8 Assembly Printer";
54    }
55
56    void printOperand(const MachineInstr *MI, int opNum);
57    void printMemOperand(const MachineInstr *MI, int opNum);
58    bool printInstruction(const MachineInstr *MI);  // autogenerated.
59    bool runOnMachineFunction(MachineFunction &F);
60    bool doInitialization(Module &M);
61    bool doFinalization(Module &M);
62  };
63} // end of anonymous namespace
64
65#include "SparcV8GenAsmWriter.inc"
66
67/// createSparcV8CodePrinterPass - Returns a pass that prints the SparcV8
68/// assembly code for a MachineFunction to the given output stream,
69/// using the given target machine description.  This should work
70/// regardless of whether the function is in SSA form.
71///
72FunctionPass *llvm::createSparcV8CodePrinterPass (std::ostream &o,
73                                                  TargetMachine &tm) {
74  return new SparcV8AsmPrinter(o, tm);
75}
76
77/// runOnMachineFunction - This uses the printMachineInstruction()
78/// method to print assembly for each instruction.
79///
80bool SparcV8AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
81  SetupMachineFunction(MF);
82
83  // Print out constants referenced by the function
84  EmitConstantPool(MF.getConstantPool());
85
86  // BBNumber is used here so that a given Printer will never give two
87  // BBs the same name. (If you have a better way, please let me know!)
88  static unsigned BBNumber = 0;
89
90  O << "\n\n";
91  // What's my mangled name?
92  CurrentFnName = Mang->getValueName(MF.getFunction());
93
94  // Print out labels for the function.
95  O << "\t.text\n";
96  O << "\t.align 16\n";
97  O << "\t.globl\t" << CurrentFnName << "\n";
98  O << "\t.type\t" << CurrentFnName << ", #function\n";
99  O << CurrentFnName << ":\n";
100
101  // Number each basic block so that we can consistently refer to them
102  // in PC-relative references.
103  NumberForBB.clear();
104  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
105       I != E; ++I) {
106    NumberForBB[I->getBasicBlock()] = BBNumber++;
107  }
108
109  // Print out code for the function.
110  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
111       I != E; ++I) {
112    // Print a label for the basic block.
113    O << ".LBB" << Mang->getValueName(MF.getFunction ())
114      << "_" << I->getNumber () << ":\t! "
115      << I->getBasicBlock ()->getName () << "\n";
116    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
117         II != E; ++II) {
118      // Print the assembly for the instruction.
119      O << "\t";
120      printInstruction(II);
121      ++EmittedInsts;
122    }
123  }
124
125  // We didn't modify anything.
126  return false;
127}
128
129void SparcV8AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
130  const MachineOperand &MO = MI->getOperand (opNum);
131  const MRegisterInfo &RI = *TM.getRegisterInfo();
132  bool CloseParen = false;
133  if (MI->getOpcode() == V8::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
134    O << "%hi(";
135    CloseParen = true;
136  } else if (MI->getOpcode() ==V8::ORri &&!MO.isRegister() &&!MO.isImmediate())
137  {
138    O << "%lo(";
139    CloseParen = true;
140  }
141  switch (MO.getType()) {
142  case MachineOperand::MO_VirtualRegister:
143    if (Value *V = MO.getVRegValueOrNull()) {
144      O << "<" << V->getName() << ">";
145      break;
146    }
147    // FALLTHROUGH
148  case MachineOperand::MO_MachineRegister:
149    if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
150      O << "%" << LowercaseString (RI.get(MO.getReg()).Name);
151    else
152      O << "%reg" << MO.getReg();
153    break;
154
155  case MachineOperand::MO_SignExtendedImmed:
156  case MachineOperand::MO_UnextendedImmed:
157    O << (int)MO.getImmedValue();
158    break;
159  case MachineOperand::MO_MachineBasicBlock: {
160    MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
161    O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction())
162      << "_" << MBBOp->getNumber () << "\t! "
163      << MBBOp->getBasicBlock ()->getName ();
164    return;
165  }
166  case MachineOperand::MO_PCRelativeDisp:
167    std::cerr << "Shouldn't use addPCDisp() when building SparcV8 MachineInstrs";
168    abort ();
169    return;
170  case MachineOperand::MO_GlobalAddress:
171    O << Mang->getValueName(MO.getGlobal());
172    break;
173  case MachineOperand::MO_ExternalSymbol:
174    O << MO.getSymbolName();
175    break;
176  case MachineOperand::MO_ConstantPoolIndex:
177    O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << "_"
178      << MO.getConstantPoolIndex();
179    break;
180  default:
181    O << "<unknown operand type>"; abort (); break;
182  }
183  if (CloseParen) O << ")";
184}
185
186void SparcV8AsmPrinter::printMemOperand(const MachineInstr *MI, int opNum) {
187  printOperand(MI, opNum);
188  MachineOperand::MachineOperandType OpTy = MI->getOperand(opNum+1).getType();
189
190  if ((OpTy == MachineOperand::MO_VirtualRegister ||
191       OpTy == MachineOperand::MO_MachineRegister) &&
192      MI->getOperand(opNum+1).getReg() == V8::G0)
193    return;   // don't print "+%g0"
194  if ((OpTy == MachineOperand::MO_SignExtendedImmed ||
195       OpTy == MachineOperand::MO_UnextendedImmed) &&
196      MI->getOperand(opNum+1).getImmedValue() == 0)
197    return;   // don't print "+0"
198
199  O << "+";
200  if (OpTy == MachineOperand::MO_GlobalAddress ||
201      OpTy == MachineOperand::MO_ConstantPoolIndex) {
202    O << "%lo(";
203    printOperand(MI, opNum+1);
204    O << ")";
205  } else {
206    printOperand(MI, opNum+1);
207  }
208}
209
210
211bool SparcV8AsmPrinter::doInitialization(Module &M) {
212  Mang = new Mangler(M);
213  return false; // success
214}
215
216bool SparcV8AsmPrinter::doFinalization(Module &M) {
217  const TargetData &TD = TM.getTargetData();
218
219  // Print out module-level global variables here.
220  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
221    if (I->hasInitializer()) {   // External global require no code
222      O << "\n\n";
223      std::string name = Mang->getValueName(I);
224      Constant *C = I->getInitializer();
225      unsigned Size = TD.getTypeSize(C->getType());
226      unsigned Align = TD.getTypeAlignment(C->getType());
227
228      if (C->isNullValue() &&
229          (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
230           I->hasWeakLinkage() /* FIXME: Verify correct */)) {
231        SwitchSection(".data", I);
232        if (I->hasInternalLinkage())
233          O << "\t.local " << name << "\n";
234
235        O << "\t.comm " << name << "," << TD.getTypeSize(C->getType())
236          << "," << (unsigned)TD.getTypeAlignment(C->getType());
237        O << "\t\t! ";
238        WriteAsOperand(O, I, true, true, &M);
239        O << "\n";
240      } else {
241        switch (I->getLinkage()) {
242        case GlobalValue::LinkOnceLinkage:
243        case GlobalValue::WeakLinkage:   // FIXME: Verify correct for weak.
244          // Nonnull linkonce -> weak
245          O << "\t.weak " << name << "\n";
246          SwitchSection("", I);
247          O << "\t.section\t\".llvm.linkonce.d." << name
248            << "\",\"aw\",@progbits\n";
249          break;
250
251        case GlobalValue::AppendingLinkage:
252          // FIXME: appending linkage variables should go into a section of
253          // their name or something.  For now, just emit them as external.
254        case GlobalValue::ExternalLinkage:
255          // If external or appending, declare as a global symbol
256          O << "\t.globl " << name << "\n";
257          // FALL THROUGH
258        case GlobalValue::InternalLinkage:
259          if (C->isNullValue())
260            SwitchSection(".bss", I);
261          else
262            SwitchSection(".data", I);
263          break;
264        case GlobalValue::GhostLinkage:
265          std::cerr << "Should not have any unmaterialized functions!\n";
266          abort();
267        }
268
269        O << "\t.align " << Align << "\n";
270        O << "\t.type " << name << ",#object\n";
271        O << "\t.size " << name << "," << Size << "\n";
272        O << name << ":\t\t\t\t! ";
273        WriteAsOperand(O, I, true, true, &M);
274        O << " = ";
275        WriteAsOperand(O, C, false, false, &M);
276        O << "\n";
277        EmitGlobalConstant(C);
278      }
279    }
280
281  AsmPrinter::doFinalization(M);
282  return false; // success
283}
284