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     explicit AlphaAsmPrinter(raw_ostream &o, TargetMachine &tm,
  40                              const TargetAsmInfo *T, CodeGenOpt::Level OL,
  41                              bool V)
  42       : AsmPrinter(o, tm, T, OL, V) {}
  43
  44     virtual const char *getPassName() const {
  45       return "Alpha Assembly Printer";
  46     }
  47     bool printInstruction(const MachineInstr *MI);
  48     void printOp(const MachineOperand &MO, bool IsCallOp = false);
  49     void printOperand(const MachineInstr *MI, int opNum);
  50     void printBaseOffsetPair (const MachineInstr *MI, int i, bool brackets=true);
  51     void printModuleLevelGV(const GlobalVariable* GVar);
  52     bool runOnMachineFunction(MachineFunction &F);
  53     bool doInitialization(Module &M);
  54     bool doFinalization(Module &M);
  55
  56     bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
  57                          unsigned AsmVariant, const char *ExtraCode);
  58     bool PrintAsmMemoryOperand(const MachineInstr *MI,
  59                                unsigned OpNo,
  60                                unsigned AsmVariant,
  61                                const char *ExtraCode);
  62   };
  63 } // end of anonymous namespace
  64
  65 /// createAlphaCodePrinterPass - Returns a pass that prints the Alpha
  66 /// assembly code for a MachineFunction to the given output stream,
  67 /// using the given target machine description.  This should work
  68 /// regardless of whether the function is in SSA form.
  69 ///
  70 FunctionPass *llvm::createAlphaCodePrinterPass(raw_ostream &o,
  71                                                TargetMachine &tm,
  72                                                CodeGenOpt::Level OptLevel,
  73                                                bool verbose) {
  74   return new AlphaAsmPrinter(o, tm, tm.getTargetAsmInfo(), OptLevel, verbose);
  75 }
  76
  77 #include "AlphaGenAsmWriter.inc"
  78
  79 void AlphaAsmPrinter::printOperand(const MachineInstr *MI, int opNum)
  80 {
  81   const MachineOperand &MO = MI->getOperand(opNum);
  82   if (MO.getType() == MachineOperand::MO_Register) {
  83     assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
  84            "Not physreg??");
  85     O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
  86   } else if (MO.isImm()) {
  87     O << MO.getImm();
  88     assert(MO.getImm() < (1 << 30));
  89   } else {
  90     printOp(MO);
  91   }
  92 }
  93
  94
  95 void AlphaAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) {
  96   const TargetRegisterInfo &RI = *TM.getRegisterInfo();
  97
  98   switch (MO.getType()) {
  99   case MachineOperand::MO_Register:
 100     O << RI.get(MO.getReg()).AsmName;
 101     return;
 102
 103   case MachineOperand::MO_Immediate:
 104     cerr << "printOp() does not handle immediate values\n";
 105     abort();
 106     return;
 107
 108   case MachineOperand::MO_MachineBasicBlock:
 109     printBasicBlockLabel(MO.getMBB());
 110     return;
 111
 112   case MachineOperand::MO_ConstantPoolIndex:
 113     O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
 114       << MO.getIndex();
 115     return;
 116
 117   case MachineOperand::MO_ExternalSymbol:
 118     O << MO.getSymbolName();
 119     return;
 120
 121   case MachineOperand::MO_GlobalAddress: {
 122     GlobalValue *GV = MO.getGlobal();
 123     O << Mang->getValueName(GV);
 124     if (GV->isDeclaration() && GV->hasExternalWeakLinkage())
 125       ExtWeakSymbols.insert(GV);
 126     return;
 127   }
 128
 129   case MachineOperand::MO_JumpTableIndex:
 130     O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
 131       << '_' << MO.getIndex();
 132     return;
 133
 134   default:
 135     O << "<unknown operand type: " << MO.getType() << ">";
 136     return;
 137   }
 138 }
 139
 140 /// runOnMachineFunction - This uses the printMachineInstruction()
 141 /// method to print assembly for each instruction.
 142 ///
 143 bool AlphaAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
 144   this->MF = &MF;
 145
 146   SetupMachineFunction(MF);
 147   O << "\n\n";
 148
 149   // Print out constants referenced by the function
 150   EmitConstantPool(MF.getConstantPool());
 151
 152   // Print out jump tables referenced by the function
 153   EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
 154
 155   // Print out labels for the function.
 156   const Function *F = MF.getFunction();
 157   SwitchToSection(TAI->SectionForGlobal(F));
 158
 159   EmitAlignment(4, F);
 160   switch (F->getLinkage()) {
 161   default: assert(0 && "Unknown linkage type!");
 162   case Function::InternalLinkage:  // Symbols default to internal.
 163   case Function::PrivateLinkage:
 164     break;
 165    case Function::ExternalLinkage:
 166      O << "\t.globl " << CurrentFnName << "\n";
 167      break;
 168   case Function::WeakAnyLinkage:
 169   case Function::WeakODRLinkage:
 170   case Function::LinkOnceAnyLinkage:
 171   case Function::LinkOnceODRLinkage:
 172     O << TAI->getWeakRefDirective() << CurrentFnName << "\n";
 173     break;
 174   }
 175
 176   printVisibility(CurrentFnName, F->getVisibility());
 177
 178   O << "\t.ent " << CurrentFnName << "\n";
 179
 180   O << CurrentFnName << ":\n";
 181
 182   // Print out code for the function.
 183   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
 184        I != E; ++I) {
 185     if (I != MF.begin()) {
 186       printBasicBlockLabel(I, true, true);
 187       O << '\n';
 188     }
 189     for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
 190          II != E; ++II) {
 191       // Print the assembly for the instruction.
 192       ++EmittedInsts;
 193       if (!printInstruction(II)) {
 194         assert(0 && "Unhandled instruction in asm writer!");
 195         abort();
 196       }
 197     }
 198   }
 199
 200   O << "\t.end " << CurrentFnName << "\n";
 201
 202   // We didn't modify anything.
 203   return false;
 204 }
 205
 206 bool AlphaAsmPrinter::doInitialization(Module &M)
 207 {
 208   if(TM.getSubtarget<AlphaSubtarget>().hasCT())
 209     O << "\t.arch ev6\n"; //This might need to be ev67, so leave this test here
 210   else
 211     O << "\t.arch ev6\n";
 212   O << "\t.set noat\n";
 213   return AsmPrinter::doInitialization(M);
 214 }
 215
 216 void AlphaAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
 217   const TargetData *TD = TM.getTargetData();
 218
 219   if (!GVar->hasInitializer()) return;  // External global require no code
 220
 221   // Check to see if this is a special global used by LLVM, if so, emit it.
 222   if (EmitSpecialLLVMGlobal(GVar))
 223     return;
 224
 225   std::string name = Mang->getValueName(GVar);
 226   Constant *C = GVar->getInitializer();
 227   unsigned Size = TD->getTypeAllocSize(C->getType());
 228   unsigned Align = TD->getPreferredAlignmentLog(GVar);
 229
 230   // 0: Switch to section
 231   SwitchToSection(TAI->SectionForGlobal(GVar));
 232
 233   // 1: Check visibility
 234   printVisibility(name, GVar->getVisibility());
 235
 236   // 2: Kind
 237   switch (GVar->getLinkage()) {
 238    case GlobalValue::LinkOnceAnyLinkage:
 239    case GlobalValue::LinkOnceODRLinkage:
 240    case GlobalValue::WeakAnyLinkage:
 241    case GlobalValue::WeakODRLinkage:
 242    case GlobalValue::CommonLinkage:
 243     O << TAI->getWeakRefDirective() << name << '\n';
 244     break;
 245    case GlobalValue::AppendingLinkage:
 246    case GlobalValue::ExternalLinkage:
 247       O << TAI->getGlobalDirective() << name << "\n";
 248       break;
 249     case GlobalValue::InternalLinkage:
 250     case GlobalValue::PrivateLinkage:
 251       break;
 252     default:
 253       assert(0 && "Unknown linkage type!");
 254       cerr << "Unknown linkage type!\n";
 255       abort();
 256     }
 257
 258   // 3: Type, Size, Align
 259   if (TAI->hasDotTypeDotSizeDirective()) {
 260     O << "\t.type\t" << name << ", @object\n";
 261     O << "\t.size\t" << name << ", " << Size << "\n";
 262   }
 263
 264   EmitAlignment(Align, GVar);
 265
 266   O << name << ":\n";
 267
 268   // If the initializer is a extern weak symbol, remember to emit the weak
 269   // reference!
 270   if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
 271     if (GV->hasExternalWeakLinkage())
 272       ExtWeakSymbols.insert(GV);
 273
 274   EmitGlobalConstant(C);
 275   O << '\n';
 276 }
 277
 278 bool AlphaAsmPrinter::doFinalization(Module &M) {
 279   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
 280        I != E; ++I)
 281     printModuleLevelGV(I);
 282
 283   return AsmPrinter::doFinalization(M);
 284 }
 285
 286 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 287 ///
 288 bool AlphaAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 289                                       unsigned AsmVariant,
 290                                       const char *ExtraCode) {
 291   printOperand(MI, OpNo);
 292   return false;
 293 }
 294
 295 bool AlphaAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 296                                             unsigned OpNo,
 297                                             unsigned AsmVariant,
 298                                             const char *ExtraCode) {
 299   if (ExtraCode && ExtraCode[0])
 300     return true; // Unknown modifier.
 301   O << "0(";
 302   printOperand(MI, OpNo);
 303   O << ")";
 304   return false;
 305 }