lib/Target/Alpha/AsmPrinter/AlphaAsmPrinter.cpp

   1 //===-- AlphaAsmPrinter.cpp - Alpha 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 Alpha assembly language.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #define DEBUG_TYPE "asm-printer"
  16 #include "Alpha.h"
  17 #include "AlphaInstrInfo.h"
  18 #include "AlphaTargetMachine.h"
  19 #include "llvm/Module.h"
  20 #include "llvm/Type.h"
  21 #include "llvm/Assembly/Writer.h"
  22 #include "llvm/CodeGen/AsmPrinter.h"
  23 #include "llvm/CodeGen/DwarfWriter.h"
  24 #include "llvm/Target/TargetAsmInfo.h"
  25 #include "llvm/Target/TargetMachine.h"
  26 #include "llvm/Support/Compiler.h"
  27 #include "llvm/Support/Mangler.h"
  28 #include "llvm/Support/raw_ostream.h"
  29 #include "llvm/ADT/Statistic.h"
  30 using namespace llvm;
  31
  32 STATISTIC(EmittedInsts, "Number of machine instrs printed");
  33
  34 namespace {
  35   struct VISIBILITY_HIDDEN AlphaAsmPrinter : public AsmPrinter {
  36     /// Unique incrementer for label values for referencing Global values.
  37     ///
  38
  39     AlphaAsmPrinter(raw_ostream &o, TargetMachine &tm,
  40                     const TargetAsmInfo *T, bool F, bool V)
  41       : AsmPrinter(o, tm, T, F, V) {}
  42
  43     virtual const char *getPassName() const {
  44       return "Alpha Assembly Printer";
  45     }
  46     bool printInstruction(const MachineInstr *MI);
  47     void printOp(const MachineOperand &MO, bool IsCallOp = false);
  48     void printOperand(const MachineInstr *MI, int opNum);
  49     void printBaseOffsetPair (const MachineInstr *MI, int i, bool brackets=true);
  50     void printModuleLevelGV(const GlobalVariable* GVar);
  51     bool runOnMachineFunction(MachineFunction &F);
  52     bool doInitialization(Module &M);
  53     bool doFinalization(Module &M);
  54
  55     bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
  56                          unsigned AsmVariant, const char *ExtraCode);
  57     bool PrintAsmMemoryOperand(const MachineInstr *MI,
  58                                unsigned OpNo,
  59                                unsigned AsmVariant,
  60                                const char *ExtraCode);
  61   };
  62 } // end of anonymous namespace
  63
  64 /// createAlphaCodePrinterPass - Returns a pass that prints the Alpha
  65 /// assembly code for a MachineFunction to the given output stream,
  66 /// using the given target machine description.  This should work
  67 /// regardless of whether the function is in SSA form.
  68 ///
  69 FunctionPass *llvm::createAlphaCodePrinterPass(raw_ostream &o,
  70                                                TargetMachine &tm,
  71                                                bool fast, bool verbose) {
  72   return new AlphaAsmPrinter(o, tm, tm.getTargetAsmInfo(), fast, verbose);
  73 }
  74
  75 #include "AlphaGenAsmWriter.inc"
  76
  77 void AlphaAsmPrinter::printOperand(const MachineInstr *MI, int opNum)
  78 {
  79   const MachineOperand &MO = MI->getOperand(opNum);
  80   if (MO.getType() == MachineOperand::MO_Register) {
  81     assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
  82            "Not physreg??");
  83     O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
  84   } else if (MO.isImm()) {
  85     O << MO.getImm();
  86     assert(MO.getImm() < (1 << 30));
  87   } else {
  88     printOp(MO);
  89   }
  90 }
  91
  92
  93 void AlphaAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) {
  94   const TargetRegisterInfo &RI = *TM.getRegisterInfo();
  95
  96   switch (MO.getType()) {
  97   case MachineOperand::MO_Register:
  98     O << RI.get(MO.getReg()).AsmName;
  99     return;
 100
 101   case MachineOperand::MO_Immediate:
 102     cerr << "printOp() does not handle immediate values\n";
 103     abort();
 104     return;
 105
 106   case MachineOperand::MO_MachineBasicBlock:
 107     printBasicBlockLabel(MO.getMBB());
 108     return;
 109
 110   case MachineOperand::MO_ConstantPoolIndex:
 111     O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
 112       << MO.getIndex();
 113     return;
 114
 115   case MachineOperand::MO_ExternalSymbol:
 116     O << MO.getSymbolName();
 117     return;
 118
 119   case MachineOperand::MO_GlobalAddress: {
 120     GlobalValue *GV = MO.getGlobal();
 121     O << Mang->getValueName(GV);
 122     if (GV->isDeclaration() && GV->hasExternalWeakLinkage())
 123       ExtWeakSymbols.insert(GV);
 124     return;
 125   }
 126
 127   case MachineOperand::MO_JumpTableIndex:
 128     O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
 129       << '_' << MO.getIndex();
 130     return;
 131
 132   default:
 133     O << "<unknown operand type: " << MO.getType() << ">";
 134     return;
 135   }
 136 }
 137
 138 /// runOnMachineFunction - This uses the printMachineInstruction()
 139 /// method to print assembly for each instruction.
 140 ///
 141 bool AlphaAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
 142   this->MF = &MF;
 143
 144   SetupMachineFunction(MF);
 145   O << "\n\n";
 146
 147   // Print out constants referenced by the function
 148   EmitConstantPool(MF.getConstantPool());
 149
 150   // Print out jump tables referenced by the function
 151   EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
 152
 153   // Print out labels for the function.
 154   const Function *F = MF.getFunction();
 155   SwitchToSection(TAI->SectionForGlobal(F));
 156
 157   EmitAlignment(4, F);
 158   switch (F->getLinkage()) {
 159   default: assert(0 && "Unknown linkage type!");
 160   case Function::InternalLinkage:  // Symbols default to internal.
 161   case Function::PrivateLinkage:
 162     break;
 163    case Function::ExternalLinkage:
 164      O << "\t.globl " << CurrentFnName << "\n";
 165      break;
 166   case Function::WeakAnyLinkage:
 167   case Function::WeakODRLinkage:
 168   case Function::LinkOnceAnyLinkage:
 169   case Function::LinkOnceODRLinkage:
 170     O << TAI->getWeakRefDirective() << CurrentFnName << "\n";
 171     break;
 172   }
 173
 174   printVisibility(CurrentFnName, F->getVisibility());
 175
 176   O << "\t.ent " << CurrentFnName << "\n";
 177
 178   O << CurrentFnName << ":\n";
 179
 180   // Print out code for the function.
 181   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
 182        I != E; ++I) {
 183     if (I != MF.begin()) {
 184       printBasicBlockLabel(I, true, true);
 185       O << '\n';
 186     }
 187     for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
 188          II != E; ++II) {
 189       // Print the assembly for the instruction.
 190       ++EmittedInsts;
 191       if (!printInstruction(II)) {
 192         assert(0 && "Unhandled instruction in asm writer!");
 193         abort();
 194       }
 195     }
 196   }
 197
 198   O << "\t.end " << CurrentFnName << "\n";
 199
 200   // We didn't modify anything.
 201   return false;
 202 }
 203
 204 bool AlphaAsmPrinter::doInitialization(Module &M)
 205 {
 206   if(TM.getSubtarget<AlphaSubtarget>().hasCT())
 207     O << "\t.arch ev6\n"; //This might need to be ev67, so leave this test here
 208   else
 209     O << "\t.arch ev6\n";
 210   O << "\t.set noat\n";
 211   return AsmPrinter::doInitialization(M);
 212 }
 213
 214 void AlphaAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
 215   const TargetData *TD = TM.getTargetData();
 216
 217   if (!GVar->hasInitializer()) return;  // External global require no code
 218
 219   // Check to see if this is a special global used by LLVM, if so, emit it.
 220   if (EmitSpecialLLVMGlobal(GVar))
 221     return;
 222
 223   std::string name = Mang->getValueName(GVar);
 224   Constant *C = GVar->getInitializer();
 225   unsigned Size = TD->getTypePaddedSize(C->getType());
 226   unsigned Align = TD->getPreferredAlignmentLog(GVar);
 227
 228   // 0: Switch to section
 229   SwitchToSection(TAI->SectionForGlobal(GVar));
 230
 231   // 1: Check visibility
 232   printVisibility(name, GVar->getVisibility());
 233
 234   // 2: Kind
 235   switch (GVar->getLinkage()) {
 236    case GlobalValue::LinkOnceAnyLinkage:
 237    case GlobalValue::LinkOnceODRLinkage:
 238    case GlobalValue::WeakAnyLinkage:
 239    case GlobalValue::WeakODRLinkage:
 240    case GlobalValue::CommonLinkage:
 241     O << TAI->getWeakRefDirective() << name << '\n';
 242     break;
 243    case GlobalValue::AppendingLinkage:
 244    case GlobalValue::ExternalLinkage:
 245       O << TAI->getGlobalDirective() << name << "\n";
 246       break;
 247     case GlobalValue::InternalLinkage:
 248     case GlobalValue::PrivateLinkage:
 249       break;
 250     default:
 251       assert(0 && "Unknown linkage type!");
 252       cerr << "Unknown linkage type!\n";
 253       abort();
 254     }
 255
 256   // 3: Type, Size, Align
 257   if (TAI->hasDotTypeDotSizeDirective()) {
 258     O << "\t.type\t" << name << ", @object\n";
 259     O << "\t.size\t" << name << ", " << Size << "\n";
 260   }
 261
 262   EmitAlignment(Align, GVar);
 263
 264   O << name << ":\n";
 265
 266   // If the initializer is a extern weak symbol, remember to emit the weak
 267   // reference!
 268   if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
 269     if (GV->hasExternalWeakLinkage())
 270       ExtWeakSymbols.insert(GV);
 271
 272   EmitGlobalConstant(C);
 273   O << '\n';
 274 }
 275
 276 bool AlphaAsmPrinter::doFinalization(Module &M) {
 277   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
 278        I != E; ++I)
 279     printModuleLevelGV(I);
 280
 281   return AsmPrinter::doFinalization(M);
 282 }
 283
 284 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 285 ///
 286 bool AlphaAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 287                                       unsigned AsmVariant,
 288                                       const char *ExtraCode) {
 289   printOperand(MI, OpNo);
 290   return false;
 291 }
 292
 293 bool AlphaAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 294                                             unsigned OpNo,
 295                                             unsigned AsmVariant,
 296                                             const char *ExtraCode) {
 297   if (ExtraCode && ExtraCode[0])
 298     return true; // Unknown modifier.
 299   O << "0(";
 300   printOperand(MI, OpNo);
 301   O << ")";
 302   return false;
 303 }