PPCAsmPrinter.cpp revision 563321a2582851c653d0863e8e0bba3d483734f9
1//===-- PPCAsmPrinter.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 "PPC.h" 21#include "PPCTargetMachine.h" 22#include "PPCSubtarget.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/AsmPrinter.h" 28#include "llvm/CodeGen/DwarfWriter.h" 29#include "llvm/CodeGen/MachineDebugInfo.h" 30#include "llvm/CodeGen/MachineFunctionPass.h" 31#include "llvm/CodeGen/MachineInstr.h" 32#include "llvm/Support/Mangler.h" 33#include "llvm/Support/MathExtras.h" 34#include "llvm/Support/CommandLine.h" 35#include "llvm/Support/Debug.h" 36#include "llvm/Support/Compiler.h" 37#include "llvm/Target/TargetAsmInfo.h" 38#include "llvm/Target/MRegisterInfo.h" 39#include "llvm/Target/TargetInstrInfo.h" 40#include "llvm/Target/TargetOptions.h" 41#include "llvm/ADT/Statistic.h" 42#include "llvm/ADT/StringExtras.h" 43#include <iostream> 44#include <set> 45using namespace llvm; 46 47namespace { 48 Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed"); 49 50 struct VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter { 51 std::set<std::string> FnStubs, GVStubs; 52 53 PPCAsmPrinter(std::ostream &O, TargetMachine &TM, TargetAsmInfo *T) 54 : AsmPrinter(O, TM, T) {} 55 56 virtual const char *getPassName() const { 57 return "PowerPC Assembly Printer"; 58 } 59 60 PPCTargetMachine &getTM() { 61 return static_cast<PPCTargetMachine&>(TM); 62 } 63 64 unsigned enumRegToMachineReg(unsigned enumReg) { 65 switch (enumReg) { 66 default: assert(0 && "Unhandled register!"); break; 67 case PPC::CR0: return 0; 68 case PPC::CR1: return 1; 69 case PPC::CR2: return 2; 70 case PPC::CR3: return 3; 71 case PPC::CR4: return 4; 72 case PPC::CR5: return 5; 73 case PPC::CR6: return 6; 74 case PPC::CR7: return 7; 75 } 76 abort(); 77 } 78 79 /// printInstruction - This method is automatically generated by tablegen 80 /// from the instruction set description. This method returns true if the 81 /// machine instruction was sufficiently described to print it, otherwise it 82 /// returns false. 83 bool printInstruction(const MachineInstr *MI); 84 85 void printMachineInstruction(const MachineInstr *MI); 86 void printOp(const MachineOperand &MO); 87 88 void printOperand(const MachineInstr *MI, unsigned OpNo) { 89 const MachineOperand &MO = MI->getOperand(OpNo); 90 if (MO.isRegister()) { 91 assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??"); 92 O << TM.getRegisterInfo()->get(MO.getReg()).Name; 93 } else if (MO.isImmediate()) { 94 O << MO.getImmedValue(); 95 } else { 96 printOp(MO); 97 } 98 } 99 100 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 101 unsigned AsmVariant, const char *ExtraCode); 102 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 103 unsigned AsmVariant, const char *ExtraCode); 104 105 106 void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) { 107 char value = MI->getOperand(OpNo).getImmedValue(); 108 value = (value << (32-5)) >> (32-5); 109 O << (int)value; 110 } 111 void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) { 112 unsigned char value = MI->getOperand(OpNo).getImmedValue(); 113 assert(value <= 31 && "Invalid u5imm argument!"); 114 O << (unsigned int)value; 115 } 116 void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) { 117 unsigned char value = MI->getOperand(OpNo).getImmedValue(); 118 assert(value <= 63 && "Invalid u6imm argument!"); 119 O << (unsigned int)value; 120 } 121 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) { 122 O << (short)MI->getOperand(OpNo).getImmedValue(); 123 } 124 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) { 125 O << (unsigned short)MI->getOperand(OpNo).getImmedValue(); 126 } 127 void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) { 128 O << (short)(MI->getOperand(OpNo).getImmedValue()*4); 129 } 130 void printBranchOperand(const MachineInstr *MI, unsigned OpNo) { 131 // Branches can take an immediate operand. This is used by the branch 132 // selection pass to print $+8, an eight byte displacement from the PC. 133 if (MI->getOperand(OpNo).isImmediate()) { 134 O << "$+" << MI->getOperand(OpNo).getImmedValue()*4; 135 } else { 136 printOp(MI->getOperand(OpNo)); 137 } 138 } 139 void printCallOperand(const MachineInstr *MI, unsigned OpNo) { 140 const MachineOperand &MO = MI->getOperand(OpNo); 141 if (TM.getRelocationModel() != Reloc::Static) { 142 if (MO.getType() == MachineOperand::MO_GlobalAddress) { 143 GlobalValue *GV = MO.getGlobal(); 144 if (((GV->isExternal() || GV->hasWeakLinkage() || 145 GV->hasLinkOnceLinkage()))) { 146 // Dynamically-resolved functions need a stub for the function. 147 std::string Name = Mang->getValueName(GV); 148 FnStubs.insert(Name); 149 O << "L" << Name << "$stub"; 150 return; 151 } 152 } 153 if (MO.getType() == MachineOperand::MO_ExternalSymbol) { 154 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName(); 155 FnStubs.insert(Name); 156 O << "L" << Name << "$stub"; 157 return; 158 } 159 } 160 161 printOp(MI->getOperand(OpNo)); 162 } 163 void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) { 164 O << (int)MI->getOperand(OpNo).getImmedValue()*4; 165 } 166 void printPICLabel(const MachineInstr *MI, unsigned OpNo) { 167 O << "\"L" << getFunctionNumber() << "$pb\"\n"; 168 O << "\"L" << getFunctionNumber() << "$pb\":"; 169 } 170 void printSymbolHi(const MachineInstr *MI, unsigned OpNo) { 171 if (MI->getOperand(OpNo).isImmediate()) { 172 printS16ImmOperand(MI, OpNo); 173 } else { 174 O << "ha16("; 175 printOp(MI->getOperand(OpNo)); 176 if (TM.getRelocationModel() == Reloc::PIC_) 177 O << "-\"L" << getFunctionNumber() << "$pb\")"; 178 else 179 O << ')'; 180 } 181 } 182 void printSymbolLo(const MachineInstr *MI, unsigned OpNo) { 183 if (MI->getOperand(OpNo).isImmediate()) { 184 printS16ImmOperand(MI, OpNo); 185 } else { 186 O << "lo16("; 187 printOp(MI->getOperand(OpNo)); 188 if (TM.getRelocationModel() == Reloc::PIC_) 189 O << "-\"L" << getFunctionNumber() << "$pb\")"; 190 else 191 O << ')'; 192 } 193 } 194 void printcrbitm(const MachineInstr *MI, unsigned OpNo) { 195 unsigned CCReg = MI->getOperand(OpNo).getReg(); 196 unsigned RegNo = enumRegToMachineReg(CCReg); 197 O << (0x80 >> RegNo); 198 } 199 // The new addressing mode printers. 200 void printMemRegImm(const MachineInstr *MI, unsigned OpNo) { 201 printSymbolLo(MI, OpNo); 202 O << '('; 203 if (MI->getOperand(OpNo+1).isRegister() && 204 MI->getOperand(OpNo+1).getReg() == PPC::R0) 205 O << "0"; 206 else 207 printOperand(MI, OpNo+1); 208 O << ')'; 209 } 210 void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) { 211 if (MI->getOperand(OpNo).isImmediate()) 212 printS16X4ImmOperand(MI, OpNo); 213 else 214 printSymbolLo(MI, OpNo); 215 O << '('; 216 if (MI->getOperand(OpNo+1).isRegister() && 217 MI->getOperand(OpNo+1).getReg() == PPC::R0) 218 O << "0"; 219 else 220 printOperand(MI, OpNo+1); 221 O << ')'; 222 } 223 224 void printMemRegReg(const MachineInstr *MI, unsigned OpNo) { 225 // When used as the base register, r0 reads constant zero rather than 226 // the value contained in the register. For this reason, the darwin 227 // assembler requires that we print r0 as 0 (no r) when used as the base. 228 const MachineOperand &MO = MI->getOperand(OpNo); 229 if (MO.getReg() == PPC::R0) 230 O << '0'; 231 else 232 O << TM.getRegisterInfo()->get(MO.getReg()).Name; 233 O << ", "; 234 printOperand(MI, OpNo+1); 235 } 236 237 virtual bool runOnMachineFunction(MachineFunction &F) = 0; 238 virtual bool doFinalization(Module &M) = 0; 239 240 }; 241 242 struct VISIBILITY_HIDDEN DarwinTargetAsmInfo : public TargetAsmInfo { 243 DarwinTargetAsmInfo(PPCTargetMachine &TM) { 244 bool isPPC64 = TM.getSubtargetImpl()->isPPC64(); 245 246 CommentString = ";"; 247 GlobalPrefix = "_"; 248 PrivateGlobalPrefix = "L"; 249 ZeroDirective = "\t.space\t"; 250 SetDirective = "\t.set"; 251 Data64bitsDirective = isPPC64 ? ".quad\t" : 0; 252 AlignmentIsInBytes = false; 253 ConstantPoolSection = "\t.const\t"; 254 JumpTableDataSection = ".const"; 255 JumpTableTextSection = "\t.text"; 256 LCOMMDirective = "\t.lcomm\t"; 257 StaticCtorsSection = ".mod_init_func"; 258 StaticDtorsSection = ".mod_term_func"; 259 InlineAsmStart = "# InlineAsm Start"; 260 InlineAsmEnd = "# InlineAsm End"; 261 262 NeedsSet = true; 263 AddressSize = isPPC64 ? 8 : 4; 264 DwarfAbbrevSection = ".section __DWARF,__debug_abbrev"; 265 DwarfInfoSection = ".section __DWARF,__debug_info"; 266 DwarfLineSection = ".section __DWARF,__debug_line"; 267 DwarfFrameSection = ".section __DWARF,__debug_frame"; 268 DwarfPubNamesSection = ".section __DWARF,__debug_pubnames"; 269 DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes"; 270 DwarfStrSection = ".section __DWARF,__debug_str"; 271 DwarfLocSection = ".section __DWARF,__debug_loc"; 272 DwarfARangesSection = ".section __DWARF,__debug_aranges"; 273 DwarfRangesSection = ".section __DWARF,__debug_ranges"; 274 DwarfMacInfoSection = ".section __DWARF,__debug_macinfo"; 275 } 276 }; 277 278 /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS 279 /// X 280 struct VISIBILITY_HIDDEN DarwinAsmPrinter : public PPCAsmPrinter { 281 282 DwarfWriter DW; 283 284 DarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM, TargetAsmInfo *T) 285 : PPCAsmPrinter(O, TM, T), DW(O, this, T) { 286 bool isPPC64 = TM.getSubtargetImpl()->isPPC64(); 287 } 288 289 virtual const char *getPassName() const { 290 return "Darwin PPC Assembly Printer"; 291 } 292 293 bool runOnMachineFunction(MachineFunction &F); 294 bool doInitialization(Module &M); 295 bool doFinalization(Module &M); 296 297 void getAnalysisUsage(AnalysisUsage &AU) const { 298 AU.setPreservesAll(); 299 AU.addRequired<MachineDebugInfo>(); 300 PPCAsmPrinter::getAnalysisUsage(AU); 301 } 302 303 }; 304} // end of anonymous namespace 305 306/// createDarwinCodePrinterPass - Returns a pass that prints the PPC assembly 307/// code for a MachineFunction to the given output stream, in a format that the 308/// Darwin assembler can deal with. 309/// 310FunctionPass *llvm::createDarwinCodePrinterPass(std::ostream &o, 311 PPCTargetMachine &tm) { 312 TargetAsmInfo *TAI = new DarwinTargetAsmInfo(tm); 313 return new DarwinAsmPrinter(o, tm, TAI); 314} 315 316// Include the auto-generated portion of the assembly writer 317#include "PPCGenAsmWriter.inc" 318 319void PPCAsmPrinter::printOp(const MachineOperand &MO) { 320 switch (MO.getType()) { 321 case MachineOperand::MO_Immediate: 322 std::cerr << "printOp() does not handle immediate values\n"; 323 abort(); 324 return; 325 326 case MachineOperand::MO_MachineBasicBlock: 327 printBasicBlockLabel(MO.getMachineBasicBlock()); 328 return; 329 case MachineOperand::MO_JumpTableIndex: 330 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 331 << '_' << MO.getJumpTableIndex(); 332 // FIXME: PIC relocation model 333 return; 334 case MachineOperand::MO_ConstantPoolIndex: 335 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() 336 << '_' << MO.getConstantPoolIndex(); 337 return; 338 case MachineOperand::MO_ExternalSymbol: 339 // Computing the address of an external symbol, not calling it. 340 if (TM.getRelocationModel() != Reloc::Static) { 341 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName(); 342 GVStubs.insert(Name); 343 O << "L" << Name << "$non_lazy_ptr"; 344 return; 345 } 346 O << TAI->getGlobalPrefix() << MO.getSymbolName(); 347 return; 348 case MachineOperand::MO_GlobalAddress: { 349 // Computing the address of a global symbol, not calling it. 350 GlobalValue *GV = MO.getGlobal(); 351 std::string Name = Mang->getValueName(GV); 352 int offset = MO.getOffset(); 353 354 // External or weakly linked global variables need non-lazily-resolved stubs 355 if (TM.getRelocationModel() != Reloc::Static) { 356 if (((GV->isExternal() || GV->hasWeakLinkage() || 357 GV->hasLinkOnceLinkage()))) { 358 GVStubs.insert(Name); 359 O << "L" << Name << "$non_lazy_ptr"; 360 return; 361 } 362 } 363 364 O << Name; 365 return; 366 } 367 368 default: 369 O << "<unknown operand type: " << MO.getType() << ">"; 370 return; 371 } 372} 373 374/// PrintAsmOperand - Print out an operand for an inline asm expression. 375/// 376bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 377 unsigned AsmVariant, 378 const char *ExtraCode) { 379 // Does this asm operand have a single letter operand modifier? 380 if (ExtraCode && ExtraCode[0]) { 381 if (ExtraCode[1] != 0) return true; // Unknown modifier. 382 383 switch (ExtraCode[0]) { 384 default: return true; // Unknown modifier. 385 case 'L': // Write second word of DImode reference. 386 // Verify that this operand has two consecutive registers. 387 if (!MI->getOperand(OpNo).isRegister() || 388 OpNo+1 == MI->getNumOperands() || 389 !MI->getOperand(OpNo+1).isRegister()) 390 return true; 391 ++OpNo; // Return the high-part. 392 break; 393 } 394 } 395 396 printOperand(MI, OpNo); 397 return false; 398} 399 400bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 401 unsigned AsmVariant, 402 const char *ExtraCode) { 403 if (ExtraCode && ExtraCode[0]) 404 return true; // Unknown modifier. 405 printMemRegReg(MI, OpNo); 406 return false; 407} 408 409/// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to 410/// the current output stream. 411/// 412void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) { 413 ++EmittedInsts; 414 415 // Check for slwi/srwi mnemonics. 416 if (MI->getOpcode() == PPC::RLWINM) { 417 bool FoundMnemonic = false; 418 unsigned char SH = MI->getOperand(2).getImmedValue(); 419 unsigned char MB = MI->getOperand(3).getImmedValue(); 420 unsigned char ME = MI->getOperand(4).getImmedValue(); 421 if (SH <= 31 && MB == 0 && ME == (31-SH)) { 422 O << "slwi "; FoundMnemonic = true; 423 } 424 if (SH <= 31 && MB == (32-SH) && ME == 31) { 425 O << "srwi "; FoundMnemonic = true; 426 SH = 32-SH; 427 } 428 if (FoundMnemonic) { 429 printOperand(MI, 0); 430 O << ", "; 431 printOperand(MI, 1); 432 O << ", " << (unsigned int)SH << "\n"; 433 return; 434 } 435 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) { 436 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) { 437 O << "mr "; 438 printOperand(MI, 0); 439 O << ", "; 440 printOperand(MI, 1); 441 O << "\n"; 442 return; 443 } 444 } 445 446 if (printInstruction(MI)) 447 return; // Printer was automatically generated 448 449 assert(0 && "Unhandled instruction in asm writer!"); 450 abort(); 451 return; 452} 453 454/// runOnMachineFunction - This uses the printMachineInstruction() 455/// method to print assembly for each instruction. 456/// 457bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) { 458 DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>()); 459 460 SetupMachineFunction(MF); 461 O << "\n\n"; 462 463 // Print out constants referenced by the function 464 EmitConstantPool(MF.getConstantPool()); 465 466 // Print out jump tables referenced by the function 467 EmitJumpTableInfo(MF.getJumpTableInfo()); 468 469 // Print out labels for the function. 470 const Function *F = MF.getFunction(); 471 switch (F->getLinkage()) { 472 default: assert(0 && "Unknown linkage type!"); 473 case Function::InternalLinkage: // Symbols default to internal. 474 SwitchToTextSection("\t.text", F); 475 break; 476 case Function::ExternalLinkage: 477 SwitchToTextSection("\t.text", F); 478 O << "\t.globl\t" << CurrentFnName << "\n"; 479 break; 480 case Function::WeakLinkage: 481 case Function::LinkOnceLinkage: 482 SwitchToTextSection( 483 ".section __TEXT,__textcoal_nt,coalesced,pure_instructions", F); 484 O << "\t.globl\t" << CurrentFnName << "\n"; 485 O << "\t.weak_definition\t" << CurrentFnName << "\n"; 486 break; 487 } 488 EmitAlignment(4, F); 489 O << CurrentFnName << ":\n"; 490 491 // Emit pre-function debug information. 492 DW.BeginFunction(&MF); 493 494 // Print out code for the function. 495 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); 496 I != E; ++I) { 497 // Print a label for the basic block. 498 if (I != MF.begin()) { 499 printBasicBlockLabel(I, true); 500 O << '\n'; 501 } 502 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); 503 II != E; ++II) { 504 // Print the assembly for the instruction. 505 O << "\t"; 506 printMachineInstruction(II); 507 } 508 } 509 510 // Emit post-function debug information. 511 DW.EndFunction(); 512 513 // We didn't modify anything. 514 return false; 515} 516 517 518bool DarwinAsmPrinter::doInitialization(Module &M) { 519 if (TM.getSubtarget<PPCSubtarget>().isGigaProcessor()) 520 O << "\t.machine ppc970\n"; 521 AsmPrinter::doInitialization(M); 522 523 // Darwin wants symbols to be quoted if they have complex names. 524 Mang->setUseQuotes(true); 525 526 // Emit initial debug information. 527 DW.BeginModule(&M); 528 return false; 529} 530 531bool DarwinAsmPrinter::doFinalization(Module &M) { 532 const TargetData *TD = TM.getTargetData(); 533 534 // Print out module-level global variables here. 535 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 536 I != E; ++I) { 537 if (!I->hasInitializer()) continue; // External global require no code 538 539 // Check to see if this is a special global used by LLVM, if so, emit it. 540 if (EmitSpecialLLVMGlobal(I)) 541 continue; 542 543 std::string name = Mang->getValueName(I); 544 Constant *C = I->getInitializer(); 545 unsigned Size = TD->getTypeSize(C->getType()); 546 unsigned Align = getPreferredAlignmentLog(I); 547 548 if (C->isNullValue() && /* FIXME: Verify correct */ 549 (I->hasInternalLinkage() || I->hasWeakLinkage() || 550 I->hasLinkOnceLinkage() || 551 (I->hasExternalLinkage() && !I->hasSection()))) { 552 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 553 if (I->hasExternalLinkage()) { 554 O << "\t.globl " << name << '\n'; 555 O << "\t.zerofill __DATA, __common, " << name << ", " 556 << Size << ", " << Align; 557 } else if (I->hasInternalLinkage()) { 558 SwitchToDataSection("\t.data", I); 559 O << TAI->getLCOMMDirective() << name << "," << Size << "," << Align; 560 } else { 561 SwitchToDataSection("\t.data", I); 562 O << ".comm " << name << "," << Size; 563 } 564 O << "\t\t; '" << I->getName() << "'\n"; 565 } else { 566 switch (I->getLinkage()) { 567 case GlobalValue::LinkOnceLinkage: 568 case GlobalValue::WeakLinkage: 569 O << "\t.globl " << name << '\n' 570 << "\t.weak_definition " << name << '\n'; 571 SwitchToDataSection(".section __DATA,__datacoal_nt,coalesced", I); 572 break; 573 case GlobalValue::AppendingLinkage: 574 // FIXME: appending linkage variables should go into a section of 575 // their name or something. For now, just emit them as external. 576 case GlobalValue::ExternalLinkage: 577 // If external or appending, declare as a global symbol 578 O << "\t.globl " << name << "\n"; 579 // FALL THROUGH 580 case GlobalValue::InternalLinkage: 581 SwitchToDataSection("\t.data", I); 582 break; 583 default: 584 std::cerr << "Unknown linkage type!"; 585 abort(); 586 } 587 588 EmitAlignment(Align, I); 589 O << name << ":\t\t\t\t; '" << I->getName() << "'\n"; 590 EmitGlobalConstant(C); 591 O << '\n'; 592 } 593 } 594 595 bool isPPC64 = TD->getPointerSizeInBits() == 64; 596 597 // Output stubs for dynamically-linked functions 598 if (TM.getRelocationModel() == Reloc::PIC_) { 599 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); 600 i != e; ++i) { 601 SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs," 602 "pure_instructions,32", 0); 603 EmitAlignment(4); 604 O << "L" << *i << "$stub:\n"; 605 O << "\t.indirect_symbol " << *i << "\n"; 606 O << "\tmflr r0\n"; 607 O << "\tbcl 20,31,L0$" << *i << "\n"; 608 O << "L0$" << *i << ":\n"; 609 O << "\tmflr r11\n"; 610 O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n"; 611 O << "\tmtlr r0\n"; 612 if (isPPC64) 613 O << "\tldu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; 614 else 615 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; 616 O << "\tmtctr r12\n"; 617 O << "\tbctr\n"; 618 SwitchToDataSection(".lazy_symbol_pointer", 0); 619 O << "L" << *i << "$lazy_ptr:\n"; 620 O << "\t.indirect_symbol " << *i << "\n"; 621 if (isPPC64) 622 O << "\t.quad dyld_stub_binding_helper\n"; 623 else 624 O << "\t.long dyld_stub_binding_helper\n"; 625 } 626 } else { 627 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); 628 i != e; ++i) { 629 SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs," 630 "pure_instructions,16", 0); 631 EmitAlignment(4); 632 O << "L" << *i << "$stub:\n"; 633 O << "\t.indirect_symbol " << *i << "\n"; 634 O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n"; 635 if (isPPC64) 636 O << "\tldu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n"; 637 else 638 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n"; 639 O << "\tmtctr r12\n"; 640 O << "\tbctr\n"; 641 SwitchToDataSection(".lazy_symbol_pointer", 0); 642 O << "L" << *i << "$lazy_ptr:\n"; 643 O << "\t.indirect_symbol " << *i << "\n"; 644 if (isPPC64) 645 O << "\t.quad dyld_stub_binding_helper\n"; 646 else 647 O << "\t.long dyld_stub_binding_helper\n"; 648 } 649 } 650 651 O << "\n"; 652 653 // Output stubs for external and common global variables. 654 if (GVStubs.begin() != GVStubs.end()) { 655 SwitchToDataSection(".non_lazy_symbol_pointer", 0); 656 for (std::set<std::string>::iterator I = GVStubs.begin(), 657 E = GVStubs.end(); I != E; ++I) { 658 O << "L" << *I << "$non_lazy_ptr:\n"; 659 O << "\t.indirect_symbol " << *I << "\n"; 660 if (isPPC64) 661 O << "\t.quad\t0\n"; 662 else 663 O << "\t.long\t0\n"; 664 665 } 666 } 667 668 // Emit initial debug information. 669 DW.EndModule(); 670 671 // Funny Darwin hack: This flag tells the linker that no global symbols 672 // contain code that falls through to other global symbols (e.g. the obvious 673 // implementation of multiple entry points). If this doesn't occur, the 674 // linker can safely perform dead code stripping. Since LLVM never generates 675 // code that does this, it is always safe to set. 676 O << "\t.subsections_via_symbols\n"; 677 678 AsmPrinter::doFinalization(M); 679 return false; // success 680} 681 682