SparcAsmPrinter.cpp revision 4fca01731a86dbbd758eaf94e4c7edfa36d38db7 
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 = 0;  // .xword is only supported by V9.
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    if (I != MF.begin())
116      O << ".LBB" << Mang->getValueName(MF.getFunction ())
117        << "_" << I->getNumber () << ":\t! "
118        << I->getBasicBlock ()->getName () << "\n";
119    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
120         II != E; ++II) {
121      // Print the assembly for the instruction.
122      O << "\t";
123      printInstruction(II);
124      ++EmittedInsts;
125    }
126  }
127
128  // We didn't modify anything.
129  return false;
130}
131
132void SparcV8AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
133  const MachineOperand &MO = MI->getOperand (opNum);
134  const MRegisterInfo &RI = *TM.getRegisterInfo();
135  bool CloseParen = false;
136  if (MI->getOpcode() == V8::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
137    O << "%hi(";
138    CloseParen = true;
139  } else if ((MI->getOpcode() == V8::ORri || MI->getOpcode() == V8::ADDri)
140             && !MO.isRegister() && !MO.isImmediate()) {
141    O << "%lo(";
142    CloseParen = true;
143  }
144  switch (MO.getType()) {
145  case MachineOperand::MO_VirtualRegister:
146    if (Value *V = MO.getVRegValueOrNull()) {
147      O << "<" << V->getName() << ">";
148      break;
149    }
150    // FALLTHROUGH
151  case MachineOperand::MO_MachineRegister:
152    if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
153      O << "%" << LowercaseString (RI.get(MO.getReg()).Name);
154    else
155      O << "%reg" << MO.getReg();
156    break;
157
158  case MachineOperand::MO_SignExtendedImmed:
159  case MachineOperand::MO_UnextendedImmed:
160    O << (int)MO.getImmedValue();
161    break;
162  case MachineOperand::MO_MachineBasicBlock: {
163    MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
164    O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction())
165      << "_" << MBBOp->getNumber () << "\t! "
166      << MBBOp->getBasicBlock ()->getName ();
167    return;
168  }
169  case MachineOperand::MO_PCRelativeDisp:
170    std::cerr << "Shouldn't use addPCDisp() when building SparcV8 MachineInstrs";
171    abort ();
172    return;
173  case MachineOperand::MO_GlobalAddress:
174    O << Mang->getValueName(MO.getGlobal());
175    break;
176  case MachineOperand::MO_ExternalSymbol:
177    O << MO.getSymbolName();
178    break;
179  case MachineOperand::MO_ConstantPoolIndex:
180    O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << "_"
181      << MO.getConstantPoolIndex();
182    break;
183  default:
184    O << "<unknown operand type>"; abort (); break;
185  }
186  if (CloseParen) O << ")";
187}
188
189void SparcV8AsmPrinter::printMemOperand(const MachineInstr *MI, int opNum) {
190  printOperand(MI, opNum);
191  MachineOperand::MachineOperandType OpTy = MI->getOperand(opNum+1).getType();
192
193  if ((OpTy == MachineOperand::MO_VirtualRegister ||
194       OpTy == MachineOperand::MO_MachineRegister) &&
195      MI->getOperand(opNum+1).getReg() == V8::G0)
196    return;   // don't print "+%g0"
197  if ((OpTy == MachineOperand::MO_SignExtendedImmed ||
198       OpTy == MachineOperand::MO_UnextendedImmed) &&
199      MI->getOperand(opNum+1).getImmedValue() == 0)
200    return;   // don't print "+0"
201
202  O << "+";
203  if (OpTy == MachineOperand::MO_GlobalAddress ||
204      OpTy == MachineOperand::MO_ConstantPoolIndex) {
205    O << "%lo(";
206    printOperand(MI, opNum+1);
207    O << ")";
208  } else {
209    printOperand(MI, opNum+1);
210  }
211}
212
213
214bool SparcV8AsmPrinter::doInitialization(Module &M) {
215  Mang = new Mangler(M);
216  return false; // success
217}
218
219bool SparcV8AsmPrinter::doFinalization(Module &M) {
220  const TargetData &TD = TM.getTargetData();
221
222  // Print out module-level global variables here.
223  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
224    if (I->hasInitializer()) {   // External global require no code
225      O << "\n\n";
226      std::string name = Mang->getValueName(I);
227      Constant *C = I->getInitializer();
228      unsigned Size = TD.getTypeSize(C->getType());
229      unsigned Align = TD.getTypeAlignment(C->getType());
230
231      if (C->isNullValue() &&
232          (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
233           I->hasWeakLinkage() /* FIXME: Verify correct */)) {
234        SwitchSection(".data", I);
235        if (I->hasInternalLinkage())
236          O << "\t.local " << name << "\n";
237
238        O << "\t.comm " << name << "," << TD.getTypeSize(C->getType())
239          << "," << (unsigned)TD.getTypeAlignment(C->getType());
240        O << "\t\t! ";
241        WriteAsOperand(O, I, true, true, &M);
242        O << "\n";
243      } else {
244        switch (I->getLinkage()) {
245        case GlobalValue::LinkOnceLinkage:
246        case GlobalValue::WeakLinkage:   // FIXME: Verify correct for weak.
247          // Nonnull linkonce -> weak
248          O << "\t.weak " << name << "\n";
249          SwitchSection("", I);
250          O << "\t.section\t\".llvm.linkonce.d." << name
251            << "\",\"aw\",@progbits\n";
252          break;
253
254        case GlobalValue::AppendingLinkage:
255          // FIXME: appending linkage variables should go into a section of
256          // their name or something.  For now, just emit them as external.
257        case GlobalValue::ExternalLinkage:
258          // If external or appending, declare as a global symbol
259          O << "\t.globl " << name << "\n";
260          // FALL THROUGH
261        case GlobalValue::InternalLinkage:
262          if (C->isNullValue())
263            SwitchSection(".bss", I);
264          else
265            SwitchSection(".data", I);
266          break;
267        case GlobalValue::GhostLinkage:
268          std::cerr << "Should not have any unmaterialized functions!\n";
269          abort();
270        }
271
272        O << "\t.align " << Align << "\n";
273        O << "\t.type " << name << ",#object\n";
274        O << "\t.size " << name << "," << Size << "\n";
275        O << name << ":\t\t\t\t! ";
276        WriteAsOperand(O, I, true, true, &M);
277        O << " = ";
278        WriteAsOperand(O, C, false, false, &M);
279        O << "\n";
280        EmitGlobalConstant(C);
281      }
282    }
283
284  AsmPrinter::doFinalization(M);
285  return false; // success
286}
287