SparcAsmPrinter.cpp revision aafce77b17d340aace52bcd49d1944109d82f14a 
1//===-- SparcAsmPrinter.cpp - Sparc LLVM assembly writer ------------------===//
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// 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#define DEBUG_TYPE "asm-printer"
16#include "Sparc.h"
17#include "SparcInstrInfo.h"
18#include "llvm/Constants.h"
19#include "llvm/DerivedTypes.h"
20#include "llvm/Module.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 <cstring>
35using namespace llvm;
36
37STATISTIC(EmittedInsts, "Number of machine instrs printed");
38
39namespace {
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 printInstruction()
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, 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      printInstruction(II);
126      ++EmittedInsts;
127    }
128  }
129
130  // We didn't modify anything.
131  return false;
132}
133
134void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
135  const MachineOperand &MO = MI->getOperand (opNum);
136  const TargetRegisterInfo &RI = *TM.getRegisterInfo();
137  bool CloseParen = false;
138  if (MI->getOpcode() == SP::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
139    O << "%hi(";
140    CloseParen = true;
141  } else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri)
142             && !MO.isRegister() && !MO.isImmediate()) {
143    O << "%lo(";
144    CloseParen = true;
145  }
146  switch (MO.getType()) {
147  case MachineOperand::MO_Register:
148    if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
149      O << "%" << LowercaseString (RI.get(MO.getReg()).AsmName);
150    else
151      O << "%reg" << MO.getReg();
152    break;
153
154  case MachineOperand::MO_Immediate:
155    O << (int)MO.getImm();
156    break;
157  case MachineOperand::MO_MachineBasicBlock:
158    printBasicBlockLabel(MO.getMBB());
159    return;
160  case MachineOperand::MO_GlobalAddress:
161    O << Mang->getValueName(MO.getGlobal());
162    break;
163  case MachineOperand::MO_ExternalSymbol:
164    O << MO.getSymbolName();
165    break;
166  case MachineOperand::MO_ConstantPoolIndex:
167    O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
168      << MO.getIndex();
169    break;
170  default:
171    O << "<unknown operand type>"; abort (); break;
172  }
173  if (CloseParen) O << ")";
174}
175
176void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
177                                      const char *Modifier) {
178  printOperand(MI, opNum);
179
180  // If this is an ADD operand, emit it like normal operands.
181  if (Modifier && !strcmp(Modifier, "arith")) {
182    O << ", ";
183    printOperand(MI, opNum+1);
184    return;
185  }
186
187  if (MI->getOperand(opNum+1).isRegister() &&
188      MI->getOperand(opNum+1).getReg() == SP::G0)
189    return;   // don't print "+%g0"
190  if (MI->getOperand(opNum+1).isImmediate() &&
191      MI->getOperand(opNum+1).getImm() == 0)
192    return;   // don't print "+0"
193
194  O << "+";
195  if (MI->getOperand(opNum+1).isGlobalAddress() ||
196      MI->getOperand(opNum+1).isConstantPoolIndex()) {
197    O << "%lo(";
198    printOperand(MI, opNum+1);
199    O << ")";
200  } else {
201    printOperand(MI, opNum+1);
202  }
203}
204
205void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
206  int CC = (int)MI->getOperand(opNum).getImm();
207  O << SPARCCondCodeToString((SPCC::CondCodes)CC);
208}
209
210
211
212bool SparcAsmPrinter::doInitialization(Module &M) {
213  Mang = new Mangler(M);
214  return false; // success
215}
216
217bool SparcAsmPrinter::doFinalization(Module &M) {
218  const TargetData *TD = TM.getTargetData();
219
220  // Print out module-level global variables here.
221  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
222       I != E; ++I)
223    if (I->hasInitializer()) {   // External global require no code
224      // Check to see if this is a special global used by LLVM, if so, emit it.
225      if (EmitSpecialLLVMGlobal(I))
226        continue;
227
228      O << "\n\n";
229      std::string name = Mang->getValueName(I);
230      Constant *C = I->getInitializer();
231      unsigned Size = TD->getABITypeSize(C->getType());
232      unsigned Align = TD->getPreferredAlignment(I);
233
234      if (C->isNullValue() && (I->hasCommonLinkage() ||
235           I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
236           I->hasWeakLinkage() /* FIXME: Verify correct */)) {
237        SwitchToDataSection(".data", I);
238        if (I->hasInternalLinkage())
239          O << "\t.local " << name << "\n";
240
241        O << "\t.comm " << name << "," << TD->getABITypeSize(C->getType())
242          << "," << Align;
243        O << "\n";
244      } else {
245        switch (I->getLinkage()) {
246        case GlobalValue::CommonLinkage:
247        case GlobalValue::LinkOnceLinkage:
248        case GlobalValue::WeakLinkage:   // FIXME: Verify correct for weak.
249          // Nonnull linkonce -> weak
250          O << "\t.weak " << name << "\n";
251          SwitchToDataSection("", I);
252          O << "\t.section\t\".llvm.linkonce.d." << name
253            << "\",\"aw\",@progbits\n";
254          break;
255
256        case GlobalValue::AppendingLinkage:
257          // FIXME: appending linkage variables should go into a section of
258          // their name or something.  For now, just emit them as external.
259        case GlobalValue::ExternalLinkage:
260          // If external or appending, declare as a global symbol
261          O << "\t.globl " << name << "\n";
262          // FALL THROUGH
263        case GlobalValue::InternalLinkage:
264          if (C->isNullValue())
265            SwitchToDataSection(".bss", I);
266          else
267            SwitchToDataSection(".data", I);
268          break;
269        case GlobalValue::GhostLinkage:
270          cerr << "Should not have any unmaterialized functions!\n";
271          abort();
272        case GlobalValue::DLLImportLinkage:
273          cerr << "DLLImport linkage is not supported by this target!\n";
274          abort();
275        case GlobalValue::DLLExportLinkage:
276          cerr << "DLLExport linkage is not supported by this target!\n";
277          abort();
278        default:
279          assert(0 && "Unknown linkage type!");
280        }
281
282        O << "\t.align " << Align << "\n";
283        O << "\t.type " << name << ",#object\n";
284        O << "\t.size " << name << "," << Size << "\n";
285        O << name << ":\n";
286        EmitGlobalConstant(C);
287      }
288    }
289
290  return AsmPrinter::doFinalization(M);
291}
292