PPCAsmPrinter.cpp revision 0ea3171fbfaf78672264a9299c33c81c63b2a522
1//===-- PPC32AsmPrinter.cpp - Print machine instrs to PowerPC assembly ----===// 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 PowerPC assembly language. This printer is 12// the output mechanism used by `llc'. 13// 14// Documentation at http://developer.apple.com/documentation/DeveloperTools/ 15// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html 16// 17//===----------------------------------------------------------------------===// 18 19#define DEBUG_TYPE "asmprinter" 20#include "PowerPC.h" 21#include "PowerPCInstrInfo.h" 22#include "PowerPCTargetMachine.h" 23#include "llvm/Constants.h" 24#include "llvm/DerivedTypes.h" 25#include "llvm/Module.h" 26#include "llvm/Assembly/Writer.h" 27#include "llvm/CodeGen/MachineConstantPool.h" 28#include "llvm/CodeGen/MachineFunctionPass.h" 29#include "llvm/CodeGen/MachineInstr.h" 30#include "llvm/CodeGen/ValueTypes.h" 31#include "llvm/Target/TargetMachine.h" 32#include "llvm/Support/Mangler.h" 33#include "Support/CommandLine.h" 34#include "Support/Debug.h" 35#include "Support/Statistic.h" 36#include "Support/StringExtras.h" 37#include <set> 38 39namespace llvm { 40 41namespace { 42 Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed"); 43 44 struct PowerPCAsmPrinter : public MachineFunctionPass { 45 /// Output stream on which we're printing assembly code. 46 /// 47 std::ostream &O; 48 49 /// Target machine description which we query for reg. names, data 50 /// layout, etc. 51 /// 52 PowerPCTargetMachine &TM; 53 54 /// Name-mangler for global names. 55 /// 56 Mangler *Mang; 57 std::set<std::string> FnStubs, GVStubs, LinkOnceStubs; 58 std::set<std::string> Strings; 59 60 PowerPCAsmPrinter(std::ostream &o, TargetMachine &tm) : O(o), 61 TM(reinterpret_cast<PowerPCTargetMachine&>(tm)), LabelNumber(0) {} 62 63 /// Cache of mangled name for current function. This is 64 /// recalculated at the beginning of each call to 65 /// runOnMachineFunction(). 66 /// 67 std::string CurrentFnName; 68 69 /// Unique incrementer for label values for referencing Global values. 70 /// 71 unsigned LabelNumber; 72 73 virtual const char *getPassName() const { 74 return "PowerPC Assembly Printer"; 75 } 76 77 /// printInstruction - This method is automatically generated by tablegen 78 /// from the instruction set description. This method returns true if the 79 /// machine instruction was sufficiently described to print it, otherwise it 80 /// returns false. 81 bool printInstruction(const MachineInstr *MI); 82 83 void printMachineInstruction(const MachineInstr *MI); 84 void printOp(const MachineOperand &MO, bool LoadAddrOp = false); 85 void printImmOp(const MachineOperand &MO, unsigned ArgType); 86 87 void printOperand(const MachineInstr *MI, unsigned OpNo, MVT::ValueType VT){ 88 const MachineOperand &MO = MI->getOperand(OpNo); 89 if (MO.getType() == MachineOperand::MO_MachineRegister) { 90 assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??"); 91 O << LowercaseString(TM.getRegisterInfo()->get(MO.getReg()).Name); 92 } else if (MO.isImmediate()) { 93 O << MO.getImmedValue(); 94 } else { 95 printOp(MO); 96 } 97 } 98 99 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo, 100 MVT::ValueType VT) { 101 O << (unsigned short)MI->getOperand(OpNo).getImmedValue(); 102 } 103 104 void printConstantPool(MachineConstantPool *MCP); 105 bool runOnMachineFunction(MachineFunction &F); 106 bool doInitialization(Module &M); 107 bool doFinalization(Module &M); 108 void emitGlobalConstant(const Constant* CV); 109 void emitConstantValueOnly(const Constant *CV); 110 }; 111} // end of anonymous namespace 112 113/// createPPC32AsmPrinterPass - Returns a pass that prints the PPC 114/// assembly code for a MachineFunction to the given output stream, 115/// using the given target machine description. This should work 116/// regardless of whether the function is in SSA form or not. 117/// 118FunctionPass *createPPCAsmPrinter(std::ostream &o,TargetMachine &tm) { 119 return new PowerPCAsmPrinter(o, tm); 120} 121 122// Include the auto-generated portion of the assembly writer 123#include "PowerPCGenAsmWriter.inc" 124 125/// isStringCompatible - Can we treat the specified array as a string? 126/// Only if it is an array of ubytes or non-negative sbytes. 127/// 128static bool isStringCompatible(const ConstantArray *CVA) { 129 const Type *ETy = cast<ArrayType>(CVA->getType())->getElementType(); 130 if (ETy == Type::UByteTy) return true; 131 if (ETy != Type::SByteTy) return false; 132 133 for (unsigned i = 0; i < CVA->getNumOperands(); ++i) 134 if (cast<ConstantSInt>(CVA->getOperand(i))->getValue() < 0) 135 return false; 136 137 return true; 138} 139 140/// toOctal - Convert the low order bits of X into an octal digit. 141/// 142static inline char toOctal(int X) { 143 return (X&7)+'0'; 144} 145 146/// getAsCString - Return the specified array as a C compatible 147/// string, only if the predicate isStringCompatible is true. 148/// 149static void printAsCString(std::ostream &O, const ConstantArray *CVA) { 150 assert(isStringCompatible(CVA) && "Array is not string compatible!"); 151 152 O << "\""; 153 for (unsigned i = 0; i < CVA->getNumOperands(); ++i) { 154 unsigned char C = cast<ConstantInt>(CVA->getOperand(i))->getRawValue(); 155 156 if (C == '"') { 157 O << "\\\""; 158 } else if (C == '\\') { 159 O << "\\\\"; 160 } else if (isprint(C)) { 161 O << C; 162 } else { 163 switch (C) { 164 case '\b': O << "\\b"; break; 165 case '\f': O << "\\f"; break; 166 case '\n': O << "\\n"; break; 167 case '\r': O << "\\r"; break; 168 case '\t': O << "\\t"; break; 169 default: 170 O << '\\'; 171 O << toOctal(C >> 6); 172 O << toOctal(C >> 3); 173 O << toOctal(C >> 0); 174 break; 175 } 176 } 177 } 178 O << "\""; 179} 180 181// Print out the specified constant, without a storage class. Only the 182// constants valid in constant expressions can occur here. 183void PowerPCAsmPrinter::emitConstantValueOnly(const Constant *CV) { 184 if (CV->isNullValue()) 185 O << "0"; 186 else if (const ConstantBool *CB = dyn_cast<ConstantBool>(CV)) { 187 assert(CB == ConstantBool::True); 188 O << "1"; 189 } else if (const ConstantSInt *CI = dyn_cast<ConstantSInt>(CV)) 190 O << CI->getValue(); 191 else if (const ConstantUInt *CI = dyn_cast<ConstantUInt>(CV)) 192 O << CI->getValue(); 193 else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) 194 // This is a constant address for a global variable or function. Use the 195 // name of the variable or function as the address value. 196 O << Mang->getValueName(GV); 197 else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) { 198 const TargetData &TD = TM.getTargetData(); 199 switch (CE->getOpcode()) { 200 case Instruction::GetElementPtr: { 201 // generate a symbolic expression for the byte address 202 const Constant *ptrVal = CE->getOperand(0); 203 std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end()); 204 if (unsigned Offset = TD.getIndexedOffset(ptrVal->getType(), idxVec)) { 205 O << "("; 206 emitConstantValueOnly(ptrVal); 207 O << ") + " << Offset; 208 } else { 209 emitConstantValueOnly(ptrVal); 210 } 211 break; 212 } 213 case Instruction::Cast: { 214 // Support only non-converting or widening casts for now, that is, ones 215 // that do not involve a change in value. This assertion is really gross, 216 // and may not even be a complete check. 217 Constant *Op = CE->getOperand(0); 218 const Type *OpTy = Op->getType(), *Ty = CE->getType(); 219 220 // Remember, kids, pointers on x86 can be losslessly converted back and 221 // forth into 32-bit or wider integers, regardless of signedness. :-P 222 assert(((isa<PointerType>(OpTy) 223 && (Ty == Type::LongTy || Ty == Type::ULongTy 224 || Ty == Type::IntTy || Ty == Type::UIntTy)) 225 || (isa<PointerType>(Ty) 226 && (OpTy == Type::LongTy || OpTy == Type::ULongTy 227 || OpTy == Type::IntTy || OpTy == Type::UIntTy)) 228 || (((TD.getTypeSize(Ty) >= TD.getTypeSize(OpTy)) 229 && OpTy->isLosslesslyConvertibleTo(Ty)))) 230 && "FIXME: Don't yet support this kind of constant cast expr"); 231 O << "("; 232 emitConstantValueOnly(Op); 233 O << ")"; 234 break; 235 } 236 case Instruction::Add: 237 O << "("; 238 emitConstantValueOnly(CE->getOperand(0)); 239 O << ") + ("; 240 emitConstantValueOnly(CE->getOperand(1)); 241 O << ")"; 242 break; 243 default: 244 assert(0 && "Unsupported operator!"); 245 } 246 } else { 247 assert(0 && "Unknown constant value!"); 248 } 249} 250 251// Print a constant value or values, with the appropriate storage class as a 252// prefix. 253void PowerPCAsmPrinter::emitGlobalConstant(const Constant *CV) { 254 const TargetData &TD = TM.getTargetData(); 255 256 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) { 257 if (isStringCompatible(CVA)) { 258 O << "\t.ascii "; 259 printAsCString(O, CVA); 260 O << "\n"; 261 } else { // Not a string. Print the values in successive locations 262 for (unsigned i=0, e = CVA->getNumOperands(); i != e; i++) 263 emitGlobalConstant(CVA->getOperand(i)); 264 } 265 return; 266 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) { 267 // Print the fields in successive locations. Pad to align if needed! 268 const StructLayout *cvsLayout = TD.getStructLayout(CVS->getType()); 269 unsigned sizeSoFar = 0; 270 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; i++) { 271 const Constant* field = CVS->getOperand(i); 272 273 // Check if padding is needed and insert one or more 0s. 274 unsigned fieldSize = TD.getTypeSize(field->getType()); 275 unsigned padSize = ((i == e-1? cvsLayout->StructSize 276 : cvsLayout->MemberOffsets[i+1]) 277 - cvsLayout->MemberOffsets[i]) - fieldSize; 278 sizeSoFar += fieldSize + padSize; 279 280 // Now print the actual field value 281 emitGlobalConstant(field); 282 283 // Insert the field padding unless it's zero bytes... 284 if (padSize) 285 O << "\t.space\t " << padSize << "\n"; 286 } 287 assert(sizeSoFar == cvsLayout->StructSize && 288 "Layout of constant struct may be incorrect!"); 289 return; 290 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) { 291 // FP Constants are printed as integer constants to avoid losing 292 // precision... 293 double Val = CFP->getValue(); 294 union DU { // Abide by C TBAA rules 295 double FVal; 296 uint64_t UVal; 297 struct { 298 uint32_t MSWord; 299 uint32_t LSWord; 300 } T; 301 } U; 302 U.FVal = Val; 303 304 O << ".long\t" << U.T.MSWord << "\t; double most significant word " 305 << Val << "\n"; 306 O << ".long\t" << U.T.LSWord << "\t; double least significant word " 307 << Val << "\n"; 308 return; 309 } else if (CV->getType() == Type::ULongTy || CV->getType() == Type::LongTy) { 310 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) { 311 union DU { // Abide by C TBAA rules 312 int64_t UVal; 313 struct { 314 uint32_t MSWord; 315 uint32_t LSWord; 316 } T; 317 } U; 318 U.UVal = CI->getRawValue(); 319 320 O << ".long\t" << U.T.MSWord << "\t; Double-word most significant word " 321 << U.UVal << "\n"; 322 O << ".long\t" << U.T.LSWord << "\t; Double-word least significant word " 323 << U.UVal << "\n"; 324 return; 325 } 326 } 327 328 const Type *type = CV->getType(); 329 O << "\t"; 330 switch (type->getTypeID()) { 331 case Type::UByteTyID: case Type::SByteTyID: 332 O << ".byte"; 333 break; 334 case Type::UShortTyID: case Type::ShortTyID: 335 O << ".short"; 336 break; 337 case Type::BoolTyID: 338 case Type::PointerTyID: 339 case Type::UIntTyID: case Type::IntTyID: 340 O << ".long"; 341 break; 342 case Type::ULongTyID: case Type::LongTyID: 343 assert (0 && "Should have already output double-word constant."); 344 case Type::FloatTyID: case Type::DoubleTyID: 345 assert (0 && "Should have already output floating point constant."); 346 default: 347 if (CV == Constant::getNullValue(type)) { // Zero initializer? 348 O << ".space\t" << TD.getTypeSize(type) << "\n"; 349 return; 350 } 351 std::cerr << "Can't handle printing: " << *CV; 352 abort(); 353 break; 354 } 355 O << "\t"; 356 emitConstantValueOnly(CV); 357 O << "\n"; 358} 359 360/// printConstantPool - Print to the current output stream assembly 361/// representations of the constants in the constant pool MCP. This is 362/// used to print out constants which have been "spilled to memory" by 363/// the code generator. 364/// 365void PowerPCAsmPrinter::printConstantPool(MachineConstantPool *MCP) { 366 const std::vector<Constant*> &CP = MCP->getConstants(); 367 const TargetData &TD = TM.getTargetData(); 368 369 if (CP.empty()) return; 370 371 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 372 O << "\t.const\n"; 373 O << "\t.align " << (unsigned)TD.getTypeAlignment(CP[i]->getType()) 374 << "\n"; 375 O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t;" 376 << *CP[i] << "\n"; 377 emitGlobalConstant(CP[i]); 378 } 379} 380 381/// runOnMachineFunction - This uses the printMachineInstruction() 382/// method to print assembly for each instruction. 383/// 384bool PowerPCAsmPrinter::runOnMachineFunction(MachineFunction &MF) { 385 O << "\n\n"; 386 // What's my mangled name? 387 CurrentFnName = Mang->getValueName(MF.getFunction()); 388 389 // Print out constants referenced by the function 390 printConstantPool(MF.getConstantPool()); 391 392 // Print out labels for the function. 393 O << "\t.text\n"; 394 O << "\t.globl\t" << CurrentFnName << "\n"; 395 O << "\t.align 2\n"; 396 O << CurrentFnName << ":\n"; 397 398 // Print out code for the function. 399 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); 400 I != E; ++I) { 401 // Print a label for the basic block. 402 O << ".LBB" << CurrentFnName << "_" << I->getNumber() << ":\t; " 403 << I->getBasicBlock()->getName() << "\n"; 404 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); 405 II != E; ++II) { 406 // Print the assembly for the instruction. 407 O << "\t"; 408 printMachineInstruction(II); 409 } 410 } 411 ++LabelNumber; 412 413 // We didn't modify anything. 414 return false; 415} 416 417void PowerPCAsmPrinter::printOp(const MachineOperand &MO, 418 bool LoadAddrOp /* = false */) { 419 const MRegisterInfo &RI = *TM.getRegisterInfo(); 420 int new_symbol; 421 422 switch (MO.getType()) { 423 case MachineOperand::MO_VirtualRegister: 424 if (Value *V = MO.getVRegValueOrNull()) { 425 O << "<" << V->getName() << ">"; 426 return; 427 } 428 // FALLTHROUGH 429 case MachineOperand::MO_MachineRegister: 430 case MachineOperand::MO_CCRegister: 431 O << LowercaseString(RI.get(MO.getReg()).Name); 432 return; 433 434 case MachineOperand::MO_SignExtendedImmed: 435 case MachineOperand::MO_UnextendedImmed: 436 std::cerr << "printOp() does not handle immediate values\n"; 437 abort(); 438 return; 439 440 case MachineOperand::MO_PCRelativeDisp: 441 std::cerr << "Shouldn't use addPCDisp() when building PPC MachineInstrs"; 442 abort(); 443 return; 444 445 case MachineOperand::MO_MachineBasicBlock: { 446 MachineBasicBlock *MBBOp = MO.getMachineBasicBlock(); 447 O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction()) 448 << "_" << MBBOp->getNumber() << "\t; " 449 << MBBOp->getBasicBlock()->getName(); 450 return; 451 } 452 453 case MachineOperand::MO_ConstantPoolIndex: 454 O << ".CPI" << CurrentFnName << "_" << MO.getConstantPoolIndex(); 455 return; 456 457 case MachineOperand::MO_ExternalSymbol: 458 O << MO.getSymbolName(); 459 return; 460 461 case MachineOperand::MO_GlobalAddress: { 462 GlobalValue *GV = MO.getGlobal(); 463 std::string Name = Mang->getValueName(GV); 464 465 // Dynamically-resolved functions need a stub for the function. Be 466 // wary however not to output $stub for external functions whose addresses 467 // are taken. Those should be emitted as $non_lazy_ptr below. 468 Function *F = dyn_cast<Function>(GV); 469 if (F && F->isExternal() && !LoadAddrOp && 470 TM.CalledFunctions.find(F) != TM.CalledFunctions.end()) { 471 FnStubs.insert(Name); 472 O << "L" << Name << "$stub"; 473 return; 474 } 475 476 // External global variables need a non-lazily-resolved stub 477 if (GV->isExternal() && TM.AddressTaken.find(GV) != TM.AddressTaken.end()) { 478 GVStubs.insert(Name); 479 O << "L" << Name << "$non_lazy_ptr"; 480 return; 481 } 482 483 if (F && LoadAddrOp && TM.AddressTaken.find(GV) != TM.AddressTaken.end()) { 484 LinkOnceStubs.insert(Name); 485 O << "L" << Name << "$non_lazy_ptr"; 486 return; 487 } 488 489 O << Mang->getValueName(GV); 490 return; 491 } 492 493 default: 494 O << "<unknown operand type: " << MO.getType() << ">"; 495 return; 496 } 497} 498 499void PowerPCAsmPrinter::printImmOp(const MachineOperand &MO, unsigned ArgType) { 500 int Imm = MO.getImmedValue(); 501 if (ArgType == PPCII::Simm16 || ArgType == PPCII::Disimm16) { 502 O << (short)Imm; 503 } else if (ArgType == PPCII::Zimm16) { 504 O << (unsigned short)Imm; 505 } else { 506 O << Imm; 507 } 508} 509 510/// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to 511/// the current output stream. 512/// 513void PowerPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) { 514 ++EmittedInsts; 515 if (printInstruction(MI)) 516 return; // Printer was automatically generated 517 518 unsigned Opcode = MI->getOpcode(); 519 const TargetInstrInfo &TII = *TM.getInstrInfo(); 520 const TargetInstrDescriptor &Desc = TII.get(Opcode); 521 unsigned i; 522 523 unsigned ArgCount = MI->getNumOperands(); 524 unsigned ArgType[] = { 525 (Desc.TSFlags >> PPCII::Arg0TypeShift) & PPCII::ArgTypeMask, 526 (Desc.TSFlags >> PPCII::Arg1TypeShift) & PPCII::ArgTypeMask, 527 (Desc.TSFlags >> PPCII::Arg2TypeShift) & PPCII::ArgTypeMask, 528 (Desc.TSFlags >> PPCII::Arg3TypeShift) & PPCII::ArgTypeMask, 529 (Desc.TSFlags >> PPCII::Arg4TypeShift) & PPCII::ArgTypeMask 530 }; 531 assert(((Desc.TSFlags & PPCII::VMX) == 0) && 532 "Instruction requires VMX support"); 533 assert(((Desc.TSFlags & PPCII::PPC64) == 0) && 534 "Instruction requires 64 bit support"); 535 536 // CALLpcrel and CALLindirect are handled specially here to print only the 537 // appropriate number of args that the assembler expects. This is because 538 // may have many arguments appended to record the uses of registers that are 539 // holding arguments to the called function. 540 if (Opcode == PPC::COND_BRANCH) { 541 std::cerr << "Error: untranslated conditional branch psuedo instruction!\n"; 542 abort(); 543 } else if (Opcode == PPC::IMPLICIT_DEF) { 544 O << "; IMPLICIT DEF "; 545 printOp(MI->getOperand(0)); 546 O << "\n"; 547 return; 548 } else if (Opcode == PPC::CALLpcrel) { 549 O << TII.getName(Opcode) << " "; 550 printOp(MI->getOperand(0)); 551 O << "\n"; 552 return; 553 } else if (Opcode == PPC::CALLindirect) { 554 O << TII.getName(Opcode) << " "; 555 printImmOp(MI->getOperand(0), ArgType[0]); 556 O << ", "; 557 printImmOp(MI->getOperand(1), ArgType[0]); 558 O << "\n"; 559 return; 560 } else if (Opcode == PPC::MovePCtoLR) { 561 // FIXME: should probably be converted to cout.width and cout.fill 562 O << "bl \"L0000" << LabelNumber << "$pb\"\n"; 563 O << "\"L0000" << LabelNumber << "$pb\":\n"; 564 O << "\tmflr "; 565 printOp(MI->getOperand(0)); 566 O << "\n"; 567 return; 568 } 569 570 O << TII.getName(Opcode) << " "; 571 if (Opcode == PPC::LOADLoDirect || Opcode == PPC::LOADLoIndirect) { 572 printOp(MI->getOperand(0)); 573 O << ", lo16("; 574 printOp(MI->getOperand(2), true /* LoadAddrOp */); 575 O << "-\"L0000" << LabelNumber << "$pb\")"; 576 O << "("; 577 if (MI->getOperand(1).getReg() == PPC::R0) 578 O << "0"; 579 else 580 printOp(MI->getOperand(1)); 581 O << ")\n"; 582 } else if (Opcode == PPC::LOADHiAddr) { 583 printOp(MI->getOperand(0)); 584 O << ", "; 585 if (MI->getOperand(1).getReg() == PPC::R0) 586 O << "0"; 587 else 588 printOp(MI->getOperand(1)); 589 O << ", ha16(" ; 590 printOp(MI->getOperand(2), true /* LoadAddrOp */); 591 O << "-\"L0000" << LabelNumber << "$pb\")\n"; 592 } else if (ArgCount == 3 && ArgType[1] == PPCII::Disimm16) { 593 printOp(MI->getOperand(0)); 594 O << ", "; 595 printImmOp(MI->getOperand(1), ArgType[1]); 596 O << "("; 597 if (MI->getOperand(2).hasAllocatedReg() && 598 MI->getOperand(2).getReg() == PPC::R0) 599 O << "0"; 600 else 601 printOp(MI->getOperand(2)); 602 O << ")\n"; 603 } else { 604 for (i = 0; i < ArgCount; ++i) { 605 // addi and friends 606 if (i == 1 && ArgCount == 3 && ArgType[2] == PPCII::Simm16 && 607 MI->getOperand(1).hasAllocatedReg() && 608 MI->getOperand(1).getReg() == PPC::R0) { 609 O << "0"; 610 // for long branch support, bc $+8 611 } else if (i == 1 && ArgCount == 2 && MI->getOperand(1).isImmediate() && 612 TII.isBranch(MI->getOpcode())) { 613 O << "$+8"; 614 assert(8 == MI->getOperand(i).getImmedValue() 615 && "branch off PC not to pc+8?"); 616 //printOp(MI->getOperand(i)); 617 } else if (MI->getOperand(i).isImmediate()) { 618 printImmOp(MI->getOperand(i), ArgType[i]); 619 } else { 620 printOp(MI->getOperand(i)); 621 } 622 if (ArgCount - 1 == i) 623 O << "\n"; 624 else 625 O << ", "; 626 } 627 } 628 return; 629} 630 631bool PowerPCAsmPrinter::doInitialization(Module &M) { 632 Mang = new Mangler(M, true); 633 return false; // success 634} 635 636// SwitchSection - Switch to the specified section of the executable if we are 637// not already in it! 638// 639static void SwitchSection(std::ostream &OS, std::string &CurSection, 640 const char *NewSection) { 641 if (CurSection != NewSection) { 642 CurSection = NewSection; 643 if (!CurSection.empty()) 644 OS << "\t" << NewSection << "\n"; 645 } 646} 647 648bool PowerPCAsmPrinter::doFinalization(Module &M) { 649 const TargetData &TD = TM.getTargetData(); 650 std::string CurSection; 651 652 // Print out module-level global variables here. 653 for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I) 654 if (I->hasInitializer()) { // External global require no code 655 O << "\n\n"; 656 std::string name = Mang->getValueName(I); 657 Constant *C = I->getInitializer(); 658 unsigned Size = TD.getTypeSize(C->getType()); 659 unsigned Align = TD.getTypeAlignment(C->getType()); 660 661 if (C->isNullValue() && /* FIXME: Verify correct */ 662 (I->hasInternalLinkage() || I->hasWeakLinkage())) { 663 SwitchSection(O, CurSection, ".data"); 664 if (I->hasInternalLinkage()) 665 O << ".lcomm " << name << "," << TD.getTypeSize(C->getType()) 666 << "," << (unsigned)TD.getTypeAlignment(C->getType()); 667 else 668 O << ".comm " << name << "," << TD.getTypeSize(C->getType()); 669 O << "\t\t; "; 670 WriteAsOperand(O, I, true, true, &M); 671 O << "\n"; 672 } else { 673 switch (I->getLinkage()) { 674 case GlobalValue::LinkOnceLinkage: 675 O << ".section __TEXT,__textcoal_nt,coalesced,no_toc\n" 676 << ".weak_definition " << name << '\n' 677 << ".private_extern " << name << '\n' 678 << ".section __DATA,__datacoal_nt,coalesced,no_toc\n"; 679 LinkOnceStubs.insert(name); 680 break; 681 case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak. 682 // Nonnull linkonce -> weak 683 O << "\t.weak " << name << "\n"; 684 SwitchSection(O, CurSection, ""); 685 O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n"; 686 break; 687 case GlobalValue::AppendingLinkage: 688 // FIXME: appending linkage variables should go into a section of 689 // their name or something. For now, just emit them as external. 690 case GlobalValue::ExternalLinkage: 691 // If external or appending, declare as a global symbol 692 O << "\t.globl " << name << "\n"; 693 // FALL THROUGH 694 case GlobalValue::InternalLinkage: 695 SwitchSection(O, CurSection, ".data"); 696 break; 697 } 698 699 O << "\t.align " << Align << "\n"; 700 O << name << ":\t\t\t\t; "; 701 WriteAsOperand(O, I, true, true, &M); 702 O << " = "; 703 WriteAsOperand(O, C, false, false, &M); 704 O << "\n"; 705 emitGlobalConstant(C); 706 } 707 } 708 709 // Output stubs for dynamically-linked functions 710 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); 711 i != e; ++i) 712 { 713 O << ".data\n"; 714 O << ".section __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32\n"; 715 O << "\t.align 2\n"; 716 O << "L" << *i << "$stub:\n"; 717 O << "\t.indirect_symbol " << *i << "\n"; 718 O << "\tmflr r0\n"; 719 O << "\tbcl 20,31,L0$" << *i << "\n"; 720 O << "L0$" << *i << ":\n"; 721 O << "\tmflr r11\n"; 722 O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n"; 723 O << "\tmtlr r0\n"; 724 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; 725 O << "\tmtctr r12\n"; 726 O << "\tbctr\n"; 727 O << ".data\n"; 728 O << ".lazy_symbol_pointer\n"; 729 O << "L" << *i << "$lazy_ptr:\n"; 730 O << "\t.indirect_symbol " << *i << "\n"; 731 O << "\t.long dyld_stub_binding_helper\n"; 732 } 733 734 O << "\n"; 735 736 // Output stubs for external global variables 737 if (GVStubs.begin() != GVStubs.end()) 738 O << ".data\n.non_lazy_symbol_pointer\n"; 739 for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end(); 740 i != e; ++i) { 741 O << "L" << *i << "$non_lazy_ptr:\n"; 742 O << "\t.indirect_symbol " << *i << "\n"; 743 O << "\t.long\t0\n"; 744 } 745 746 // Output stubs for link-once variables 747 if (LinkOnceStubs.begin() != LinkOnceStubs.end()) 748 O << ".data\n.align 2\n"; 749 for (std::set<std::string>::iterator i = LinkOnceStubs.begin(), 750 e = LinkOnceStubs.end(); i != e; ++i) { 751 O << "L" << *i << "$non_lazy_ptr:\n" 752 << "\t.long\t" << *i << '\n'; 753 } 754 755 delete Mang; 756 return false; // success 757} 758 759} // End llvm namespace 760