SparcAsmPrinter.cpp revision d17aa4b1f17f6d3fcd9079aef239ff16cfb5907f 
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/CodeGen/AsmPrinter.h"
21#include "llvm/CodeGen/MachineFunctionPass.h"
22#include "llvm/CodeGen/MachineConstantPool.h"
23#include "llvm/CodeGen/MachineInstr.h"
24#include "llvm/Target/TargetAsmInfo.h"
25#include "llvm/Target/TargetData.h"
26#include "llvm/Target/TargetMachine.h"
27#include "llvm/Support/Mangler.h"
28#include "llvm/ADT/Statistic.h"
29#include "llvm/ADT/StringExtras.h"
30#include "llvm/Support/CommandLine.h"
31#include "llvm/Support/MathExtras.h"
32#include <cctype>
33#include <iostream>
34using namespace llvm;
35
36namespace {
37  Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
38
39  struct VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
40    SparcAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
41      : AsmPrinter(O, TM, T) {
42    }
43
44    /// We name each basic block in a Function with a unique number, so
45    /// that we can consistently refer to them later. This is cleared
46    /// at the beginning of each call to runOnMachineFunction().
47    ///
48    typedef std::map<const Value *, unsigned> ValueMapTy;
49    ValueMapTy NumberForBB;
50
51    virtual const char *getPassName() const {
52      return "Sparc Assembly Printer";
53    }
54
55    void printOperand(const MachineInstr *MI, int opNum);
56    void printMemOperand(const MachineInstr *MI, int opNum,
57                         const char *Modifier = 0);
58    void printCCOperand(const MachineInstr *MI, int opNum);
59
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 "SparcGenAsmWriter.inc"
68
69/// createSparcCodePrinterPass - Returns a pass that prints the SPARC
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::createSparcCodePrinterPass(std::ostream &o,
75                                               TargetMachine &tm) {
76  return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo());
77}
78
79/// runOnMachineFunction - This uses the printMachineInstruction()
80/// method to print assembly for each instruction.
81///
82bool SparcAsmPrinter::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 the label for the function.
97  const Function *F = MF.getFunction();
98  SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
99  EmitAlignment(4, F);
100  O << "\t.globl\t" << CurrentFnName << "\n";
101  O << "\t.type\t" << CurrentFnName << ", #function\n";
102  O << CurrentFnName << ":\n";
103
104  // Number each basic block so that we can consistently refer to them
105  // in PC-relative references.
106  // FIXME: Why not use the MBB numbers?
107  NumberForBB.clear();
108  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
109       I != E; ++I) {
110    NumberForBB[I->getBasicBlock()] = BBNumber++;
111  }
112
113  // Print out code for the function.
114  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
115       I != E; ++I) {
116    // Print a label for the basic block.
117    if (I != MF.begin()) {
118      printBasicBlockLabel(I, true);
119      O << '\n';
120    }
121    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
122         II != E; ++II) {
123      // Print the assembly for the instruction.
124      O << "\t";
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 MRegisterInfo &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 (MRegisterInfo::isPhysicalRegister(MO.getReg()))
149      O << "%" << LowercaseString (RI.get(MO.getReg()).Name);
150    else
151      O << "%reg" << MO.getReg();
152    break;
153
154  case MachineOperand::MO_Immediate:
155    O << (int)MO.getImmedValue();
156    break;
157  case MachineOperand::MO_MachineBasicBlock:
158    printBasicBlockLabel(MO.getMachineBasicBlock());
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.getConstantPoolIndex();
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).getImmedValue() == 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).getImmedValue();
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->getTypeSize(C->getType());
232      unsigned Align = TD->getTypeAlignment(C->getType());
233
234      if (C->isNullValue() &&
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->getTypeSize(C->getType())
242          << "," << (unsigned)TD->getTypeAlignment(C->getType());
243        O << "\n";
244      } else {
245        switch (I->getLinkage()) {
246        case GlobalValue::LinkOnceLinkage:
247        case GlobalValue::WeakLinkage:   // FIXME: Verify correct for weak.
248          // Nonnull linkonce -> weak
249          O << "\t.weak " << name << "\n";
250          SwitchToDataSection("", I);
251          O << "\t.section\t\".llvm.linkonce.d." << name
252            << "\",\"aw\",@progbits\n";
253          break;
254
255        case GlobalValue::AppendingLinkage:
256          // FIXME: appending linkage variables should go into a section of
257          // their name or something.  For now, just emit them as external.
258        case GlobalValue::ExternalLinkage:
259          // If external or appending, declare as a global symbol
260          O << "\t.globl " << name << "\n";
261          // FALL THROUGH
262        case GlobalValue::InternalLinkage:
263          if (C->isNullValue())
264            SwitchToDataSection(".bss", I);
265          else
266            SwitchToDataSection(".data", I);
267          break;
268        case GlobalValue::GhostLinkage:
269          std::cerr << "Should not have any unmaterialized functions!\n";
270          abort();
271        case GlobalValue::DLLImportLinkage:
272          std::cerr << "DLLImport linkage is not supported by this target!\n";
273          abort();
274        case GlobalValue::DLLExportLinkage:
275          std::cerr << "DLLExport linkage is not supported by this target!\n";
276          abort();
277        default:
278          assert(0 && "Unknown linkage type!");
279        }
280
281        O << "\t.align " << Align << "\n";
282        O << "\t.type " << name << ",#object\n";
283        O << "\t.size " << name << "," << Size << "\n";
284        O << name << ":\n";
285        EmitGlobalConstant(C);
286      }
287    }
288
289  AsmPrinter::doFinalization(M);
290  return false; // success
291}
292