SparcAsmPrinter.cpp revision 29bd9e12d4fbd667c56225872b15ca490440da46 
1//===-- SparcAsmPrinter.cpp - Sparc 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 assembly language.
12//
13//===----------------------------------------------------------------------===//
14
15#include "Sparc.h"
16#include "SparcInstrInfo.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/TargetAsmInfo.h"
26#include "llvm/Target/TargetData.h"
27#include "llvm/Target/TargetMachine.h"
28#include "llvm/Support/Mangler.h"
29#include "llvm/ADT/Statistic.h"
30#include "llvm/ADT/StringExtras.h"
31#include "llvm/Support/CommandLine.h"
32#include "llvm/Support/MathExtras.h"
33#include <cctype>
34#include <iostream>
35using namespace llvm;
36
37namespace {
38  Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
39
40  struct VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
41    SparcAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
42      : AsmPrinter(O, TM, T) {
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 "Sparc Assembly Printer";
54    }
55
56    void printOperand(const MachineInstr *MI, int opNum);
57    void printMemOperand(const MachineInstr *MI, int opNum,
58                         const char *Modifier = 0);
59    void printCCOperand(const MachineInstr *MI, int opNum);
60
61    bool printInstruction(const MachineInstr *MI);  // autogenerated.
62    bool runOnMachineFunction(MachineFunction &F);
63    bool doInitialization(Module &M);
64    bool doFinalization(Module &M);
65  };
66} // end of anonymous namespace
67
68#include "SparcGenAsmWriter.inc"
69
70/// createSparcCodePrinterPass - Returns a pass that prints the SPARC
71/// assembly code for a MachineFunction to the given output stream,
72/// using the given target machine description.  This should work
73/// regardless of whether the function is in SSA form.
74///
75FunctionPass *llvm::createSparcCodePrinterPass(std::ostream &o,
76                                               TargetMachine &tm) {
77  return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo());
78}
79
80/// runOnMachineFunction - This uses the printMachineInstruction()
81/// method to print assembly for each instruction.
82///
83bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
84  SetupMachineFunction(MF);
85
86  // Print out constants referenced by the function
87  EmitConstantPool(MF.getConstantPool());
88
89  // BBNumber is used here so that a given Printer will never give two
90  // BBs the same name. (If you have a better way, please let me know!)
91  static unsigned BBNumber = 0;
92
93  O << "\n\n";
94  // What's my mangled name?
95  CurrentFnName = Mang->getValueName(MF.getFunction());
96
97  // Print out the label for the function.
98  const Function *F = MF.getFunction();
99  SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
100  EmitAlignment(4, F);
101  O << "\t.globl\t" << CurrentFnName << "\n";
102  O << "\t.type\t" << CurrentFnName << ", #function\n";
103  O << CurrentFnName << ":\n";
104
105  // Number each basic block so that we can consistently refer to them
106  // in PC-relative references.
107  // FIXME: Why not use the MBB numbers?
108  NumberForBB.clear();
109  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
110       I != E; ++I) {
111    NumberForBB[I->getBasicBlock()] = BBNumber++;
112  }
113
114  // Print out code for the function.
115  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
116       I != E; ++I) {
117    // Print a label for the basic block.
118    if (I != MF.begin()) {
119      printBasicBlockLabel(I, true);
120      O << '\n';
121    }
122    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
123         II != E; ++II) {
124      // Print the assembly for the instruction.
125      O << "\t";
126      printInstruction(II);
127      ++EmittedInsts;
128    }
129  }
130
131  // We didn't modify anything.
132  return false;
133}
134
135void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
136  const MachineOperand &MO = MI->getOperand (opNum);
137  const MRegisterInfo &RI = *TM.getRegisterInfo();
138  bool CloseParen = false;
139  if (MI->getOpcode() == SP::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
140    O << "%hi(";
141    CloseParen = true;
142  } else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri)
143             && !MO.isRegister() && !MO.isImmediate()) {
144    O << "%lo(";
145    CloseParen = true;
146  }
147  switch (MO.getType()) {
148  case MachineOperand::MO_Register:
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_Immediate:
156    O << (int)MO.getImmedValue();
157    break;
158  case MachineOperand::MO_MachineBasicBlock:
159    printBasicBlockLabel(MO.getMachineBasicBlock());
160    return;
161  case MachineOperand::MO_GlobalAddress:
162    O << Mang->getValueName(MO.getGlobal());
163    break;
164  case MachineOperand::MO_ExternalSymbol:
165    O << MO.getSymbolName();
166    break;
167  case MachineOperand::MO_ConstantPoolIndex:
168    O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
169      << MO.getConstantPoolIndex();
170    break;
171  default:
172    O << "<unknown operand type>"; abort (); break;
173  }
174  if (CloseParen) O << ")";
175}
176
177void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
178                                      const char *Modifier) {
179  printOperand(MI, opNum);
180
181  // If this is an ADD operand, emit it like normal operands.
182  if (Modifier && !strcmp(Modifier, "arith")) {
183    O << ", ";
184    printOperand(MI, opNum+1);
185    return;
186  }
187
188  MachineOperand::MachineOperandType OpTy = MI->getOperand(opNum+1).getType();
189
190  if (MI->getOperand(opNum+1).isRegister() &&
191      MI->getOperand(opNum+1).getReg() == SP::G0)
192    return;   // don't print "+%g0"
193  if (MI->getOperand(opNum+1).isImmediate() &&
194      MI->getOperand(opNum+1).getImmedValue() == 0)
195    return;   // don't print "+0"
196
197  O << "+";
198  if (MI->getOperand(opNum+1).isGlobalAddress() ||
199      MI->getOperand(opNum+1).isConstantPoolIndex()) {
200    O << "%lo(";
201    printOperand(MI, opNum+1);
202    O << ")";
203  } else {
204    printOperand(MI, opNum+1);
205  }
206}
207
208void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
209  int CC = (int)MI->getOperand(opNum).getImmedValue();
210  O << SPARCCondCodeToString((SPCC::CondCodes)CC);
211}
212
213
214
215bool SparcAsmPrinter::doInitialization(Module &M) {
216  Mang = new Mangler(M);
217  return false; // success
218}
219
220bool SparcAsmPrinter::doFinalization(Module &M) {
221  const TargetData *TD = TM.getTargetData();
222
223  // Print out module-level global variables here.
224  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
225       I != E; ++I)
226    if (I->hasInitializer()) {   // External global require no code
227      // Check to see if this is a special global used by LLVM, if so, emit it.
228      if (EmitSpecialLLVMGlobal(I))
229        continue;
230
231      O << "\n\n";
232      std::string name = Mang->getValueName(I);
233      Constant *C = I->getInitializer();
234      unsigned Size = TD->getTypeSize(C->getType());
235      unsigned Align = TD->getTypeAlignment(C->getType());
236
237      if (C->isNullValue() &&
238          (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
239           I->hasWeakLinkage() /* FIXME: Verify correct */)) {
240        SwitchToDataSection(".data", I);
241        if (I->hasInternalLinkage())
242          O << "\t.local " << name << "\n";
243
244        O << "\t.comm " << name << "," << TD->getTypeSize(C->getType())
245          << "," << (unsigned)TD->getTypeAlignment(C->getType());
246        O << "\t\t! ";
247        WriteAsOperand(O, I, true, true, &M);
248        O << "\n";
249      } else {
250        switch (I->getLinkage()) {
251        case GlobalValue::LinkOnceLinkage:
252        case GlobalValue::WeakLinkage:   // FIXME: Verify correct for weak.
253          // Nonnull linkonce -> weak
254          O << "\t.weak " << name << "\n";
255          SwitchToDataSection("", I);
256          O << "\t.section\t\".llvm.linkonce.d." << name
257            << "\",\"aw\",@progbits\n";
258          break;
259
260        case GlobalValue::AppendingLinkage:
261          // FIXME: appending linkage variables should go into a section of
262          // their name or something.  For now, just emit them as external.
263        case GlobalValue::ExternalLinkage:
264          // If external or appending, declare as a global symbol
265          O << "\t.globl " << name << "\n";
266          // FALL THROUGH
267        case GlobalValue::InternalLinkage:
268          if (C->isNullValue())
269            SwitchToDataSection(".bss", I);
270          else
271            SwitchToDataSection(".data", I);
272          break;
273        case GlobalValue::GhostLinkage:
274          std::cerr << "Should not have any unmaterialized functions!\n";
275          abort();
276        case GlobalValue::DLLImportLinkage:
277          std::cerr << "DLLImport linkage is not supported by this target!\n";
278          abort();
279        case GlobalValue::DLLExportLinkage:
280          std::cerr << "DLLExport linkage is not supported by this target!\n";
281          abort();
282        default:
283          assert(0 && "Unknown linkage type!");
284        }
285
286        O << "\t.align " << Align << "\n";
287        O << "\t.type " << name << ",#object\n";
288        O << "\t.size " << name << "," << Size << "\n";
289        O << name << ":\t\t\t\t! ";
290        WriteAsOperand(O, I, true, true, &M);
291        O << "\n";
292        EmitGlobalConstant(C);
293      }
294    }
295
296  AsmPrinter::doFinalization(M);
297  return false; // success
298}
299