SparcAsmPrinter.cpp revision a34544d96c2e84fa84827e92e193f79353c64df0 
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/TargetMachine.h"
26#include "llvm/Support/Mangler.h"
27#include "llvm/ADT/Statistic.h"
28#include "llvm/ADT/StringExtras.h"
29#include "llvm/Support/CommandLine.h"
30#include "llvm/Support/MathExtras.h"
31#include <cctype>
32#include <iostream>
33using namespace llvm;
34
35namespace {
36  Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
37
38  struct SparcAsmPrinter : public AsmPrinter {
39    SparcAsmPrinter(std::ostream &O, TargetMachine &TM) : AsmPrinter(O, TM) {
40      Data16bitsDirective = "\t.half\t";
41      Data32bitsDirective = "\t.word\t";
42      Data64bitsDirective = 0;  // .xword is only supported by V9.
43      ZeroDirective = "\t.skip\t";
44      CommentString = "!";
45      ConstantPoolSection = "\t.section \".rodata\",#alloc\n";
46    }
47
48    /// We name each basic block in a Function with a unique number, so
49    /// that we can consistently refer to them later. This is cleared
50    /// at the beginning of each call to runOnMachineFunction().
51    ///
52    typedef std::map<const Value *, unsigned> ValueMapTy;
53    ValueMapTy NumberForBB;
54
55    virtual const char *getPassName() const {
56      return "Sparc Assembly Printer";
57    }
58
59    void printOperand(const MachineInstr *MI, int opNum);
60    void printMemOperand(const MachineInstr *MI, int opNum,
61                         const char *Modifier = 0);
62    void printCCOperand(const MachineInstr *MI, int opNum);
63
64    bool printInstruction(const MachineInstr *MI);  // autogenerated.
65    bool runOnMachineFunction(MachineFunction &F);
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);
81}
82
83/// runOnMachineFunction - This uses the printMachineInstruction()
84/// method to print assembly for each instruction.
85///
86bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
87  SetupMachineFunction(MF);
88
89  // Print out constants referenced by the function
90  EmitConstantPool(MF.getConstantPool());
91
92  // BBNumber is used here so that a given Printer will never give two
93  // BBs the same name. (If you have a better way, please let me know!)
94  static unsigned BBNumber = 0;
95
96  O << "\n\n";
97  // What's my mangled name?
98  CurrentFnName = Mang->getValueName(MF.getFunction());
99
100  // Print out labels for the function.
101  O << "\t.text\n";
102  O << "\t.align 16\n";
103  O << "\t.globl\t" << CurrentFnName << "\n";
104  O << "\t.type\t" << CurrentFnName << ", #function\n";
105  O << CurrentFnName << ":\n";
106
107  // Number each basic block so that we can consistently refer to them
108  // in PC-relative references.
109  NumberForBB.clear();
110  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
111       I != E; ++I) {
112    NumberForBB[I->getBasicBlock()] = BBNumber++;
113  }
114
115  // Print out code for the function.
116  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
117       I != E; ++I) {
118    // Print a label for the basic block.
119    if (I != MF.begin())
120      O << ".LBB" << Mang->getValueName(MF.getFunction ())
121        << "_" << I->getNumber () << ":\t! "
122        << I->getBasicBlock ()->getName () << "\n";
123    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
124         II != E; ++II) {
125      // Print the assembly for the instruction.
126      O << "\t";
127      printInstruction(II);
128      ++EmittedInsts;
129    }
130  }
131
132  // We didn't modify anything.
133  return false;
134}
135
136void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
137  const MachineOperand &MO = MI->getOperand (opNum);
138  const MRegisterInfo &RI = *TM.getRegisterInfo();
139  bool CloseParen = false;
140  if (MI->getOpcode() == SP::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
141    O << "%hi(";
142    CloseParen = true;
143  } else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri)
144             && !MO.isRegister() && !MO.isImmediate()) {
145    O << "%lo(";
146    CloseParen = true;
147  }
148  switch (MO.getType()) {
149  case MachineOperand::MO_VirtualRegister:
150    if (Value *V = MO.getVRegValueOrNull()) {
151      O << "<" << V->getName() << ">";
152      break;
153    }
154    // FALLTHROUGH
155  case MachineOperand::MO_MachineRegister:
156    if (MRegisterInfo::isPhysicalRegister(MO.getReg()))
157      O << "%" << LowercaseString (RI.get(MO.getReg()).Name);
158    else
159      O << "%reg" << MO.getReg();
160    break;
161
162  case MachineOperand::MO_SignExtendedImmed:
163  case MachineOperand::MO_UnextendedImmed:
164    O << (int)MO.getImmedValue();
165    break;
166  case MachineOperand::MO_MachineBasicBlock: {
167    MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
168    O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction())
169      << "_" << MBBOp->getNumber () << "\t! "
170      << MBBOp->getBasicBlock ()->getName ();
171    return;
172  }
173  case MachineOperand::MO_PCRelativeDisp:
174    std::cerr << "Shouldn't use addPCDisp() when building Sparc MachineInstrs";
175    abort ();
176    return;
177  case MachineOperand::MO_GlobalAddress:
178    O << Mang->getValueName(MO.getGlobal());
179    break;
180  case MachineOperand::MO_ExternalSymbol:
181    O << MO.getSymbolName();
182    break;
183  case MachineOperand::MO_ConstantPoolIndex:
184    O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << "_"
185      << MO.getConstantPoolIndex();
186    break;
187  default:
188    O << "<unknown operand type>"; abort (); break;
189  }
190  if (CloseParen) O << ")";
191}
192
193void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
194                                      const char *Modifier) {
195  printOperand(MI, opNum);
196
197  // If this is an ADD operand, emit it like normal operands.
198  if (Modifier && !strcmp(Modifier, "arith")) {
199    O << ", ";
200    printOperand(MI, opNum+1);
201    return;
202  }
203
204  MachineOperand::MachineOperandType OpTy = MI->getOperand(opNum+1).getType();
205
206  if ((OpTy == MachineOperand::MO_VirtualRegister ||
207       OpTy == MachineOperand::MO_MachineRegister) &&
208      MI->getOperand(opNum+1).getReg() == SP::G0)
209    return;   // don't print "+%g0"
210  if ((OpTy == MachineOperand::MO_SignExtendedImmed ||
211       OpTy == MachineOperand::MO_UnextendedImmed) &&
212      MI->getOperand(opNum+1).getImmedValue() == 0)
213    return;   // don't print "+0"
214
215  O << "+";
216  if (OpTy == MachineOperand::MO_GlobalAddress ||
217      OpTy == MachineOperand::MO_ConstantPoolIndex) {
218    O << "%lo(";
219    printOperand(MI, opNum+1);
220    O << ")";
221  } else {
222    printOperand(MI, opNum+1);
223  }
224}
225
226void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
227  int CC = (int)MI->getOperand(opNum).getImmedValue();
228  O << SPARCCondCodeToString((SPCC::CondCodes)CC);
229}
230
231
232
233bool SparcAsmPrinter::doInitialization(Module &M) {
234  Mang = new Mangler(M);
235  return false; // success
236}
237
238bool SparcAsmPrinter::doFinalization(Module &M) {
239  const TargetData &TD = TM.getTargetData();
240
241  // Print out module-level global variables here.
242  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
243    if (I->hasInitializer()) {   // External global require no code
244      O << "\n\n";
245      std::string name = Mang->getValueName(I);
246      Constant *C = I->getInitializer();
247      unsigned Size = TD.getTypeSize(C->getType());
248      unsigned Align = TD.getTypeAlignment(C->getType());
249
250      if (C->isNullValue() &&
251          (I->hasLinkOnceLinkage() || I->hasInternalLinkage() ||
252           I->hasWeakLinkage() /* FIXME: Verify correct */)) {
253        SwitchSection(".data", I);
254        if (I->hasInternalLinkage())
255          O << "\t.local " << name << "\n";
256
257        O << "\t.comm " << name << "," << TD.getTypeSize(C->getType())
258          << "," << (unsigned)TD.getTypeAlignment(C->getType());
259        O << "\t\t! ";
260        WriteAsOperand(O, I, true, true, &M);
261        O << "\n";
262      } else {
263        switch (I->getLinkage()) {
264        case GlobalValue::LinkOnceLinkage:
265        case GlobalValue::WeakLinkage:   // FIXME: Verify correct for weak.
266          // Nonnull linkonce -> weak
267          O << "\t.weak " << name << "\n";
268          SwitchSection("", I);
269          O << "\t.section\t\".llvm.linkonce.d." << name
270            << "\",\"aw\",@progbits\n";
271          break;
272
273        case GlobalValue::AppendingLinkage:
274          // FIXME: appending linkage variables should go into a section of
275          // their name or something.  For now, just emit them as external.
276        case GlobalValue::ExternalLinkage:
277          // If external or appending, declare as a global symbol
278          O << "\t.globl " << name << "\n";
279          // FALL THROUGH
280        case GlobalValue::InternalLinkage:
281          if (C->isNullValue())
282            SwitchSection(".bss", I);
283          else
284            SwitchSection(".data", I);
285          break;
286        case GlobalValue::GhostLinkage:
287          std::cerr << "Should not have any unmaterialized functions!\n";
288          abort();
289        }
290
291        O << "\t.align " << Align << "\n";
292        O << "\t.type " << name << ",#object\n";
293        O << "\t.size " << name << "," << Size << "\n";
294        O << name << ":\t\t\t\t! ";
295        WriteAsOperand(O, I, true, true, &M);
296        O << "\n";
297        EmitGlobalConstant(C);
298      }
299    }
300
301  AsmPrinter::doFinalization(M);
302  return false; // success
303}
304