SparcAsmPrinter.cpp revision 5b794b98cebbc3982b87780657e0d280c2bcdd04 
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>
35#include <map>
36using namespace llvm;
37
38STATISTIC(EmittedInsts, "Number of machine instrs printed");
39
40namespace {
41  struct VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
42    SparcAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
43      : AsmPrinter(O, TM, T) {
44    }
45
46    /// We name each basic block in a Function with a unique number, so
47    /// that we can consistently refer to them later. This is cleared
48    /// at the beginning of each call to runOnMachineFunction().
49    ///
50    typedef std::map<const Value *, unsigned> ValueMapTy;
51    ValueMapTy NumberForBB;
52
53    virtual const char *getPassName() const {
54      return "Sparc Assembly Printer";
55    }
56
57    void printModuleLevelGV(const GlobalVariable* GVar);
58    void printOperand(const MachineInstr *MI, int opNum);
59    void printMemOperand(const MachineInstr *MI, int opNum,
60                         const char *Modifier = 0);
61    void printCCOperand(const MachineInstr *MI, int opNum);
62
63    bool printInstruction(const MachineInstr *MI);  // autogenerated.
64    bool runOnMachineFunction(MachineFunction &F);
65    std::string getSectionForFunction(const Function &F) const;
66    bool doInitialization(Module &M);
67    bool doFinalization(Module &M);
68  };
69} // end of anonymous namespace
70
71#include "SparcGenAsmWriter.inc"
72
73/// createSparcCodePrinterPass - Returns a pass that prints the SPARC
74/// assembly code for a MachineFunction to the given output stream,
75/// using the given target machine description.  This should work
76/// regardless of whether the function is in SSA form.
77///
78FunctionPass *llvm::createSparcCodePrinterPass(std::ostream &o,
79                                               TargetMachine &tm) {
80  return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo());
81}
82
83// Substitute old hook with new one temporary
84std::string SparcAsmPrinter::getSectionForFunction(const Function &F) const {
85  return TAI->SectionForGlobal(&F);
86}
87
88/// runOnMachineFunction - This uses the printInstruction()
89/// method to print assembly for each instruction.
90///
91bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
92  SetupMachineFunction(MF);
93
94  // Print out constants referenced by the function
95  EmitConstantPool(MF.getConstantPool());
96
97  // BBNumber is used here so that a given Printer will never give two
98  // BBs the same name. (If you have a better way, please let me know!)
99  static unsigned BBNumber = 0;
100
101  O << "\n\n";
102  // What's my mangled name?
103  CurrentFnName = Mang->getValueName(MF.getFunction());
104
105  // Print out the label for the function.
106  const Function *F = MF.getFunction();
107  SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
108  EmitAlignment(4, F);
109  O << "\t.globl\t" << CurrentFnName << "\n";
110  O << "\t.type\t" << CurrentFnName << ", #function\n";
111  O << CurrentFnName << ":\n";
112
113  // Number each basic block so that we can consistently refer to them
114  // in PC-relative references.
115  // FIXME: Why not use the MBB numbers?
116  NumberForBB.clear();
117  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
118       I != E; ++I) {
119    NumberForBB[I->getBasicBlock()] = BBNumber++;
120  }
121
122  // Print out code for the function.
123  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
124       I != E; ++I) {
125    // Print a label for the basic block.
126    if (I != MF.begin()) {
127      printBasicBlockLabel(I, true, true);
128      O << '\n';
129    }
130    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
131         II != E; ++II) {
132      // Print the assembly for the instruction.
133      printInstruction(II);
134      ++EmittedInsts;
135    }
136  }
137
138  // We didn't modify anything.
139  return false;
140}
141
142void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
143  const MachineOperand &MO = MI->getOperand (opNum);
144  const TargetRegisterInfo &RI = *TM.getRegisterInfo();
145  bool CloseParen = false;
146  if (MI->getOpcode() == SP::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
147    O << "%hi(";
148    CloseParen = true;
149  } else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri)
150             && !MO.isRegister() && !MO.isImmediate()) {
151    O << "%lo(";
152    CloseParen = true;
153  }
154  switch (MO.getType()) {
155  case MachineOperand::MO_Register:
156    if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
157      O << "%" << LowercaseString (RI.get(MO.getReg()).AsmName);
158    else
159      O << "%reg" << MO.getReg();
160    break;
161
162  case MachineOperand::MO_Immediate:
163    O << (int)MO.getImm();
164    break;
165  case MachineOperand::MO_MachineBasicBlock:
166    printBasicBlockLabel(MO.getMBB());
167    return;
168  case MachineOperand::MO_GlobalAddress:
169    O << Mang->getValueName(MO.getGlobal());
170    break;
171  case MachineOperand::MO_ExternalSymbol:
172    O << MO.getSymbolName();
173    break;
174  case MachineOperand::MO_ConstantPoolIndex:
175    O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
176      << MO.getIndex();
177    break;
178  default:
179    O << "<unknown operand type>"; abort (); break;
180  }
181  if (CloseParen) O << ")";
182}
183
184void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
185                                      const char *Modifier) {
186  printOperand(MI, opNum);
187
188  // If this is an ADD operand, emit it like normal operands.
189  if (Modifier && !strcmp(Modifier, "arith")) {
190    O << ", ";
191    printOperand(MI, opNum+1);
192    return;
193  }
194
195  if (MI->getOperand(opNum+1).isRegister() &&
196      MI->getOperand(opNum+1).getReg() == SP::G0)
197    return;   // don't print "+%g0"
198  if (MI->getOperand(opNum+1).isImmediate() &&
199      MI->getOperand(opNum+1).getImm() == 0)
200    return;   // don't print "+0"
201
202  O << "+";
203  if (MI->getOperand(opNum+1).isGlobalAddress() ||
204      MI->getOperand(opNum+1).isConstantPoolIndex()) {
205    O << "%lo(";
206    printOperand(MI, opNum+1);
207    O << ")";
208  } else {
209    printOperand(MI, opNum+1);
210  }
211}
212
213void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
214  int CC = (int)MI->getOperand(opNum).getImm();
215  O << SPARCCondCodeToString((SPCC::CondCodes)CC);
216}
217
218
219
220bool SparcAsmPrinter::doInitialization(Module &M) {
221  Mang = new Mangler(M);
222  return false; // success
223}
224
225bool SparcAsmPrinter::doFinalization(Module &M) {
226  // Print out module-level global variables here.
227  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
228       I != E; ++I)
229    printModuleLevelGV(I);
230
231  O << '\n';
232
233  return AsmPrinter::doFinalization(M);
234}
235
236void SparcAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
237  const TargetData *TD = TM.getTargetData();
238
239  if (!GVar->hasInitializer())
240    return;  // External global require no code
241
242  // Check to see if this is a special global used by LLVM, if so, emit it.
243  if (EmitSpecialLLVMGlobal(GVar))
244    return;
245
246  O << "\n\n";
247  std::string SectionName = TAI->SectionForGlobal(GVar);
248  std::string name = Mang->getValueName(GVar);
249  Constant *C = GVar->getInitializer();
250  unsigned Size = TD->getABITypeSize(C->getType());
251  unsigned Align = TD->getPreferredAlignment(GVar);
252
253  // FIXME: ELF supports visibility
254  SwitchToDataSection(SectionName.c_str());
255
256  if (C->isNullValue() && !GVar->hasSection()) {
257    if (!GVar->isThreadLocal() &&
258        (GVar->hasInternalLinkage() || GVar->isWeakForLinker())) {
259      if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
260
261      if (GVar->hasInternalLinkage())
262        O << "\t.local " << name << "\n";
263
264      O << TAI->getCOMMDirective() << name << ',' << Size;
265      if (TAI->getCOMMDirectiveTakesAlignment())
266        O << ',' << (1 << Align);
267
268      O << '\n';
269      return;
270    }
271  }
272
273  switch (GVar->getLinkage()) {
274   case GlobalValue::CommonLinkage:
275   case GlobalValue::LinkOnceLinkage:
276   case GlobalValue::WeakLinkage:   // FIXME: Verify correct for weak.
277    // Nonnull linkonce -> weak
278    O << "\t.weak " << name << "\n";
279    break;
280   case GlobalValue::AppendingLinkage:
281    // FIXME: appending linkage variables should go into a section of
282    // their name or something.  For now, just emit them as external.
283   case GlobalValue::ExternalLinkage:
284    // If external or appending, declare as a global symbol
285    O << TAI->getGlobalDirective() << name << "\n";
286    // FALL THROUGH
287   case GlobalValue::InternalLinkage:
288    break;
289   case GlobalValue::GhostLinkage:
290    cerr << "Should not have any unmaterialized functions!\n";
291    abort();
292   case GlobalValue::DLLImportLinkage:
293    cerr << "DLLImport linkage is not supported by this target!\n";
294    abort();
295   case GlobalValue::DLLExportLinkage:
296    cerr << "DLLExport linkage is not supported by this target!\n";
297    abort();
298   default:
299    assert(0 && "Unknown linkage type!");
300  }
301
302  if (Align)
303    O << "\t.align " << Align << "\n";
304
305  if (TAI->hasDotTypeDotSizeDirective()) {
306    O << "\t.type " << name << ",#object\n";
307    O << "\t.size " << name << "," << Size << "\n";
308  }
309
310  O << name << ":\n";
311  EmitGlobalConstant(C);
312}
313