SparcAsmPrinter.cpp revision f5da13367f88f06e3b585dc2263ab6e9ca6c4bf8 
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>
33using namespace llvm;
34
35namespace {
36  Statistic EmittedInsts("asm-printer", "Number of machine instrs printed");
37
38  struct VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
39    SparcAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
40      : AsmPrinter(O, TM, T) {
41    }
42
43    /// We name each basic block in a Function with a unique number, so
44    /// that we can consistently refer to them later. This is cleared
45    /// at the beginning of each call to runOnMachineFunction().
46    ///
47    typedef std::map<const Value *, unsigned> ValueMapTy;
48    ValueMapTy NumberForBB;
49
50    virtual const char *getPassName() const {
51      return "Sparc Assembly Printer";
52    }
53
54    void printOperand(const MachineInstr *MI, int opNum);
55    void printMemOperand(const MachineInstr *MI, int opNum,
56                         const char *Modifier = 0);
57    void printCCOperand(const MachineInstr *MI, int opNum);
58
59    bool printInstruction(const MachineInstr *MI);  // autogenerated.
60    bool runOnMachineFunction(MachineFunction &F);
61    bool doInitialization(Module &M);
62    bool doFinalization(Module &M);
63  };
64} // end of anonymous namespace
65
66#include "SparcGenAsmWriter.inc"
67
68/// createSparcCodePrinterPass - Returns a pass that prints the SPARC
69/// assembly code for a MachineFunction to the given output stream,
70/// using the given target machine description.  This should work
71/// regardless of whether the function is in SSA form.
72///
73FunctionPass *llvm::createSparcCodePrinterPass(std::ostream &o,
74                                               TargetMachine &tm) {
75  return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo());
76}
77
78/// runOnMachineFunction - This uses the printMachineInstruction()
79/// method to print assembly for each instruction.
80///
81bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
82  SetupMachineFunction(MF);
83
84  // Print out constants referenced by the function
85  EmitConstantPool(MF.getConstantPool());
86
87  // BBNumber is used here so that a given Printer will never give two
88  // BBs the same name. (If you have a better way, please let me know!)
89  static unsigned BBNumber = 0;
90
91  O << "\n\n";
92  // What's my mangled name?
93  CurrentFnName = Mang->getValueName(MF.getFunction());
94
95  // Print out the label for the function.
96  const Function *F = MF.getFunction();
97  SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
98  EmitAlignment(4, F);
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  // FIXME: Why not use the MBB numbers?
106  NumberForBB.clear();
107  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
108       I != E; ++I) {
109    NumberForBB[I->getBasicBlock()] = BBNumber++;
110  }
111
112  // Print out code for the function.
113  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
114       I != E; ++I) {
115    // Print a label for the basic block.
116    if (I != MF.begin()) {
117      printBasicBlockLabel(I, true);
118      O << '\n';
119    }
120    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
121         II != E; ++II) {
122      // Print the assembly for the instruction.
123      O << "\t";
124      printInstruction(II);
125      ++EmittedInsts;
126    }
127  }
128
129  // We didn't modify anything.
130  return false;
131}
132
133void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
134  const MachineOperand &MO = MI->getOperand (opNum);
135  const MRegisterInfo &RI = *TM.getRegisterInfo();
136  bool CloseParen = false;
137  if (MI->getOpcode() == SP::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
138    O << "%hi(";
139    CloseParen = true;
140  } else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri)
141             && !MO.isRegister() && !MO.isImmediate()) {
142    O << "%lo(";
143    CloseParen = true;
144  }
145  switch (MO.getType()) {
146  case MachineOperand::MO_Register:
147    if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
148      O << "%" << LowercaseString (RI.get(MO.getReg()).Name);
149    else
150      O << "%reg" << MO.getReg();
151    break;
152
153  case MachineOperand::MO_Immediate:
154    O << (int)MO.getImmedValue();
155    break;
156  case MachineOperand::MO_MachineBasicBlock:
157    printBasicBlockLabel(MO.getMachineBasicBlock());
158    return;
159  case MachineOperand::MO_GlobalAddress:
160    O << Mang->getValueName(MO.getGlobal());
161    break;
162  case MachineOperand::MO_ExternalSymbol:
163    O << MO.getSymbolName();
164    break;
165  case MachineOperand::MO_ConstantPoolIndex:
166    O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
167      << MO.getConstantPoolIndex();
168    break;
169  default:
170    O << "<unknown operand type>"; abort (); break;
171  }
172  if (CloseParen) O << ")";
173}
174
175void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
176                                      const char *Modifier) {
177  printOperand(MI, opNum);
178
179  // If this is an ADD operand, emit it like normal operands.
180  if (Modifier && !strcmp(Modifier, "arith")) {
181    O << ", ";
182    printOperand(MI, opNum+1);
183    return;
184  }
185
186  if (MI->getOperand(opNum+1).isRegister() &&
187      MI->getOperand(opNum+1).getReg() == SP::G0)
188    return;   // don't print "+%g0"
189  if (MI->getOperand(opNum+1).isImmediate() &&
190      MI->getOperand(opNum+1).getImmedValue() == 0)
191    return;   // don't print "+0"
192
193  O << "+";
194  if (MI->getOperand(opNum+1).isGlobalAddress() ||
195      MI->getOperand(opNum+1).isConstantPoolIndex()) {
196    O << "%lo(";
197    printOperand(MI, opNum+1);
198    O << ")";
199  } else {
200    printOperand(MI, opNum+1);
201  }
202}
203
204void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
205  int CC = (int)MI->getOperand(opNum).getImmedValue();
206  O << SPARCCondCodeToString((SPCC::CondCodes)CC);
207}
208
209
210
211bool SparcAsmPrinter::doInitialization(Module &M) {
212  Mang = new Mangler(M);
213  return false; // success
214}
215
216bool SparcAsmPrinter::doFinalization(Module &M) {
217  const TargetData *TD = TM.getTargetData();
218
219  // Print out module-level global variables here.
220  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
221       I != E; ++I)
222    if (I->hasInitializer()) {   // External global require no code
223      // Check to see if this is a special global used by LLVM, if so, emit it.
224      if (EmitSpecialLLVMGlobal(I))
225        continue;
226
227      O << "\n\n";
228      std::string name = Mang->getValueName(I);
229      Constant *C = I->getInitializer();
230      unsigned Size = TD->getTypeSize(C->getType());
231      unsigned Align = TD->getTypeAlignment(C->getType());
232
233      if (C->isNullValue() &&
234          (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
235           I->hasWeakLinkage() /* FIXME: Verify correct */)) {
236        SwitchToDataSection(".data", I);
237        if (I->hasInternalLinkage())
238          O << "\t.local " << name << "\n";
239
240        O << "\t.comm " << name << "," << TD->getTypeSize(C->getType())
241          << "," << (unsigned)TD->getTypeAlignment(C->getType());
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          SwitchToDataSection("", 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            SwitchToDataSection(".bss", I);
264          else
265            SwitchToDataSection(".data", I);
266          break;
267        case GlobalValue::GhostLinkage:
268          cerr << "Should not have any unmaterialized functions!\n";
269          abort();
270        case GlobalValue::DLLImportLinkage:
271          cerr << "DLLImport linkage is not supported by this target!\n";
272          abort();
273        case GlobalValue::DLLExportLinkage:
274          cerr << "DLLExport linkage is not supported by this target!\n";
275          abort();
276        default:
277          assert(0 && "Unknown linkage type!");
278        }
279
280        O << "\t.align " << Align << "\n";
281        O << "\t.type " << name << ",#object\n";
282        O << "\t.size " << name << "," << Size << "\n";
283        O << name << ":\n";
284        EmitGlobalConstant(C);
285      }
286    }
287
288  AsmPrinter::doFinalization(M);
289  return false; // success
290}
291