PPCAsmPrinter.cpp revision 52a51e38dc312aa262b0d771419afe1785f3cb22
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/Visibility.h" 37#include "llvm/Target/MRegisterInfo.h" 38#include "llvm/Target/TargetInstrInfo.h" 39#include "llvm/Target/TargetOptions.h" 40#include "llvm/ADT/Statistic.h" 41#include "llvm/ADT/StringExtras.h" 42#include <iostream> 43#include <set> 44using namespace llvm; 45 46namespace { 47 Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed"); 48 49 class VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter { 50 public: 51 std::set<std::string> FnStubs, GVStubs; 52 53 PPCAsmPrinter(std::ostream &O, TargetMachine &TM) 54 : AsmPrinter(O, TM) {} 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(); 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 << "$stub"; 150 return; 151 } 152 } 153 if (MO.getType() == MachineOperand::MO_ExternalSymbol) { 154 std::string Name(GlobalPrefix); Name += MO.getSymbolName(); 155 FnStubs.insert(Name); 156 O << "L" << Name << "$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 /// DarwinDwarfWriter - Dwarf debug info writer customized for Darwin/Mac OS X 243 /// 244 struct VISIBILITY_HIDDEN DarwinDwarfWriter : public DwarfWriter { 245 // Ctor. 246 DarwinDwarfWriter(std::ostream &o, AsmPrinter *ap) 247 : DwarfWriter(o, ap) 248 { 249 needsSet = true; 250 DwarfAbbrevSection = ".section __DWARF,__debug_abbrev"; 251 DwarfInfoSection = ".section __DWARF,__debug_info"; 252 DwarfLineSection = ".section __DWARF,__debug_line"; 253 DwarfFrameSection = ".section __DWARF,__debug_frame"; 254 DwarfPubNamesSection = ".section __DWARF,__debug_pubnames"; 255 DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes"; 256 DwarfStrSection = ".section __DWARF,__debug_str"; 257 DwarfLocSection = ".section __DWARF,__debug_loc"; 258 DwarfARangesSection = ".section __DWARF,__debug_aranges"; 259 DwarfRangesSection = ".section __DWARF,__debug_ranges"; 260 DwarfMacInfoSection = ".section __DWARF,__debug_macinfo"; 261 TextSection = ".text"; 262 DataSection = ".data"; 263 } 264 }; 265 266 /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS 267 /// X 268 struct VISIBILITY_HIDDEN DarwinAsmPrinter : public PPCAsmPrinter { 269 270 DarwinDwarfWriter DW; 271 272 DarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM) 273 : PPCAsmPrinter(O, TM), DW(O, this) { 274 bool isPPC64 = TM.getSubtargetImpl()->isPPC64(); 275 CommentString = ";"; 276 GlobalPrefix = "_"; 277 PrivateGlobalPrefix = "L"; // Marker for constant pool idxs 278 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros. 279 SetDirective = "\t.set"; 280 if (isPPC64) 281 Data64bitsDirective = ".quad\t"; // we can't emit a 64-bit unit 282 else 283 Data64bitsDirective = 0; // we can't emit a 64-bit unit 284 AlignmentIsInBytes = false; // Alignment is by power of 2. 285 ConstantPoolSection = "\t.const\t"; 286 JumpTableDataSection = ".const"; 287 JumpTableTextSection = "\t.text"; 288 LCOMMDirective = "\t.lcomm\t"; 289 StaticCtorsSection = ".mod_init_func"; 290 StaticDtorsSection = ".mod_term_func"; 291 InlineAsmStart = "# InlineAsm Start"; 292 InlineAsmEnd = "# InlineAsm End"; 293 } 294 295 virtual const char *getPassName() const { 296 return "Darwin PPC Assembly Printer"; 297 } 298 299 bool runOnMachineFunction(MachineFunction &F); 300 bool doInitialization(Module &M); 301 bool doFinalization(Module &M); 302 303 void getAnalysisUsage(AnalysisUsage &AU) const { 304 AU.setPreservesAll(); 305 AU.addRequired<MachineDebugInfo>(); 306 PPCAsmPrinter::getAnalysisUsage(AU); 307 } 308 309 }; 310} // end of anonymous namespace 311 312/// createDarwinAsmPrinterPass - Returns a pass that prints the PPC assembly 313/// code for a MachineFunction to the given output stream, in a format that the 314/// Darwin assembler can deal with. 315/// 316FunctionPass *llvm::createDarwinAsmPrinter(std::ostream &o, 317 PPCTargetMachine &tm) { 318 return new DarwinAsmPrinter(o, tm); 319} 320 321// Include the auto-generated portion of the assembly writer 322#include "PPCGenAsmWriter.inc" 323 324void PPCAsmPrinter::printOp(const MachineOperand &MO) { 325 switch (MO.getType()) { 326 case MachineOperand::MO_Immediate: 327 std::cerr << "printOp() does not handle immediate values\n"; 328 abort(); 329 return; 330 331 case MachineOperand::MO_MachineBasicBlock: 332 printBasicBlockLabel(MO.getMachineBasicBlock()); 333 return; 334 case MachineOperand::MO_JumpTableIndex: 335 O << PrivateGlobalPrefix << "JTI" << getFunctionNumber() 336 << '_' << MO.getJumpTableIndex(); 337 // FIXME: PIC relocation model 338 return; 339 case MachineOperand::MO_ConstantPoolIndex: 340 O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() 341 << '_' << MO.getConstantPoolIndex(); 342 return; 343 case MachineOperand::MO_ExternalSymbol: 344 // Computing the address of an external symbol, not calling it. 345 if (TM.getRelocationModel() != Reloc::Static) { 346 std::string Name(GlobalPrefix); Name += MO.getSymbolName(); 347 GVStubs.insert(Name); 348 O << "L" << Name << "$non_lazy_ptr"; 349 return; 350 } 351 O << GlobalPrefix << MO.getSymbolName(); 352 return; 353 case MachineOperand::MO_GlobalAddress: { 354 // Computing the address of a global symbol, not calling it. 355 GlobalValue *GV = MO.getGlobal(); 356 std::string Name = Mang->getValueName(GV); 357 int offset = MO.getOffset(); 358 359 // External or weakly linked global variables need non-lazily-resolved stubs 360 if (TM.getRelocationModel() != Reloc::Static) { 361 if (((GV->isExternal() || GV->hasWeakLinkage() || 362 GV->hasLinkOnceLinkage()))) { 363 GVStubs.insert(Name); 364 O << "L" << Name << "$non_lazy_ptr"; 365 return; 366 } 367 } 368 369 O << Name; 370 return; 371 } 372 373 default: 374 O << "<unknown operand type: " << MO.getType() << ">"; 375 return; 376 } 377} 378 379/// PrintAsmOperand - Print out an operand for an inline asm expression. 380/// 381bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 382 unsigned AsmVariant, 383 const char *ExtraCode) { 384 // Does this asm operand have a single letter operand modifier? 385 if (ExtraCode && ExtraCode[0]) { 386 if (ExtraCode[1] != 0) return true; // Unknown modifier. 387 388 switch (ExtraCode[0]) { 389 default: return true; // Unknown modifier. 390 case 'L': // Write second word of DImode reference. 391 // Verify that this operand has two consecutive registers. 392 if (!MI->getOperand(OpNo).isRegister() || 393 OpNo+1 == MI->getNumOperands() || 394 !MI->getOperand(OpNo+1).isRegister()) 395 return true; 396 ++OpNo; // Return the high-part. 397 break; 398 } 399 } 400 401 printOperand(MI, OpNo); 402 return false; 403} 404 405bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 406 unsigned AsmVariant, 407 const char *ExtraCode) { 408 if (ExtraCode && ExtraCode[0]) 409 return true; // Unknown modifier. 410 printMemRegReg(MI, OpNo); 411 return false; 412} 413 414/// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to 415/// the current output stream. 416/// 417void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) { 418 ++EmittedInsts; 419 420 // Check for slwi/srwi mnemonics. 421 if (MI->getOpcode() == PPC::RLWINM) { 422 bool FoundMnemonic = false; 423 unsigned char SH = MI->getOperand(2).getImmedValue(); 424 unsigned char MB = MI->getOperand(3).getImmedValue(); 425 unsigned char ME = MI->getOperand(4).getImmedValue(); 426 if (SH <= 31 && MB == 0 && ME == (31-SH)) { 427 O << "slwi "; FoundMnemonic = true; 428 } 429 if (SH <= 31 && MB == (32-SH) && ME == 31) { 430 O << "srwi "; FoundMnemonic = true; 431 SH = 32-SH; 432 } 433 if (FoundMnemonic) { 434 printOperand(MI, 0); 435 O << ", "; 436 printOperand(MI, 1); 437 O << ", " << (unsigned int)SH << "\n"; 438 return; 439 } 440 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) { 441 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) { 442 O << "mr "; 443 printOperand(MI, 0); 444 O << ", "; 445 printOperand(MI, 1); 446 O << "\n"; 447 return; 448 } 449 } 450 451 if (printInstruction(MI)) 452 return; // Printer was automatically generated 453 454 assert(0 && "Unhandled instruction in asm writer!"); 455 abort(); 456 return; 457} 458 459/// runOnMachineFunction - This uses the printMachineInstruction() 460/// method to print assembly for each instruction. 461/// 462bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) { 463 DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>()); 464 465 SetupMachineFunction(MF); 466 O << "\n\n"; 467 468 // Print out constants referenced by the function 469 EmitConstantPool(MF.getConstantPool()); 470 471 // Print out jump tables referenced by the function 472 EmitJumpTableInfo(MF.getJumpTableInfo()); 473 474 // Print out labels for the function. 475 const Function *F = MF.getFunction(); 476 switch (F->getLinkage()) { 477 default: assert(0 && "Unknown linkage type!"); 478 case Function::InternalLinkage: // Symbols default to internal. 479 SwitchToTextSection("\t.text", F); 480 break; 481 case Function::ExternalLinkage: 482 SwitchToTextSection("\t.text", F); 483 O << "\t.globl\t" << CurrentFnName << "\n"; 484 break; 485 case Function::WeakLinkage: 486 case Function::LinkOnceLinkage: 487 SwitchToTextSection( 488 ".section __TEXT,__textcoal_nt,coalesced,pure_instructions", F); 489 O << "\t.globl\t" << CurrentFnName << "\n"; 490 O << "\t.weak_definition\t" << CurrentFnName << "\n"; 491 break; 492 } 493 EmitAlignment(4, F); 494 O << CurrentFnName << ":\n"; 495 496 // Emit pre-function debug information. 497 DW.BeginFunction(&MF); 498 499 // Print out code for the function. 500 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); 501 I != E; ++I) { 502 // Print a label for the basic block. 503 if (I != MF.begin()) { 504 printBasicBlockLabel(I, true); 505 O << '\n'; 506 } 507 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); 508 II != E; ++II) { 509 // Print the assembly for the instruction. 510 O << "\t"; 511 printMachineInstruction(II); 512 } 513 } 514 515 // Emit post-function debug information. 516 DW.EndFunction(); 517 518 // We didn't modify anything. 519 return false; 520} 521 522 523bool DarwinAsmPrinter::doInitialization(Module &M) { 524 if (TM.getSubtarget<PPCSubtarget>().isGigaProcessor()) 525 O << "\t.machine ppc970\n"; 526 AsmPrinter::doInitialization(M); 527 528 // Darwin wants symbols to be quoted if they have complex names. 529 Mang->setUseQuotes(true); 530 531 // Emit initial debug information. 532 DW.BeginModule(&M); 533 return false; 534} 535 536bool DarwinAsmPrinter::doFinalization(Module &M) { 537 const TargetData *TD = TM.getTargetData(); 538 539 // Print out module-level global variables here. 540 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 541 I != E; ++I) { 542 if (!I->hasInitializer()) continue; // External global require no code 543 544 // Check to see if this is a special global used by LLVM, if so, emit it. 545 if (EmitSpecialLLVMGlobal(I)) 546 continue; 547 548 std::string name = Mang->getValueName(I); 549 Constant *C = I->getInitializer(); 550 unsigned Size = TD->getTypeSize(C->getType()); 551 unsigned Align = getPreferredAlignmentLog(I); 552 553 if (C->isNullValue() && /* FIXME: Verify correct */ 554 (I->hasInternalLinkage() || I->hasWeakLinkage() || 555 I->hasLinkOnceLinkage() || 556 (I->hasExternalLinkage() && !I->hasSection()))) { 557 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 558 if (I->hasExternalLinkage()) { 559 O << "\t.globl " << name << '\n'; 560 O << "\t.zerofill __DATA, __common, " << name << ", " 561 << Size << ", " << Align; 562 } else if (I->hasInternalLinkage()) { 563 SwitchToDataSection("\t.data", I); 564 O << LCOMMDirective << name << "," << Size << "," << Align; 565 } else { 566 SwitchToDataSection("\t.data", I); 567 O << ".comm " << name << "," << Size; 568 } 569 O << "\t\t; '" << I->getName() << "'\n"; 570 } else { 571 switch (I->getLinkage()) { 572 case GlobalValue::LinkOnceLinkage: 573 case GlobalValue::WeakLinkage: 574 O << "\t.globl " << name << '\n' 575 << "\t.weak_definition " << name << '\n'; 576 SwitchToDataSection(".section __DATA,__datacoal_nt,coalesced", I); 577 break; 578 case GlobalValue::AppendingLinkage: 579 // FIXME: appending linkage variables should go into a section of 580 // their name or something. For now, just emit them as external. 581 case GlobalValue::ExternalLinkage: 582 // If external or appending, declare as a global symbol 583 O << "\t.globl " << name << "\n"; 584 // FALL THROUGH 585 case GlobalValue::InternalLinkage: 586 SwitchToDataSection("\t.data", I); 587 break; 588 default: 589 std::cerr << "Unknown linkage type!"; 590 abort(); 591 } 592 593 EmitAlignment(Align, I); 594 O << name << ":\t\t\t\t; '" << I->getName() << "'\n"; 595 EmitGlobalConstant(C); 596 O << '\n'; 597 } 598 } 599 600 bool isPPC64 = TD->getPointerSizeInBits() == 64; 601 602 // Output stubs for dynamically-linked functions 603 if (TM.getRelocationModel() == Reloc::PIC_) { 604 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); 605 i != e; ++i) { 606 SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs," 607 "pure_instructions,32", 0); 608 EmitAlignment(4); 609 O << "L" << *i << "$stub:\n"; 610 O << "\t.indirect_symbol " << *i << "\n"; 611 O << "\tmflr r0\n"; 612 O << "\tbcl 20,31,L0$" << *i << "\n"; 613 O << "L0$" << *i << ":\n"; 614 O << "\tmflr r11\n"; 615 O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n"; 616 O << "\tmtlr r0\n"; 617 if (isPPC64) 618 O << "\tldu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; 619 else 620 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; 621 O << "\tmtctr r12\n"; 622 O << "\tbctr\n"; 623 SwitchToDataSection(".lazy_symbol_pointer", 0); 624 O << "L" << *i << "$lazy_ptr:\n"; 625 O << "\t.indirect_symbol " << *i << "\n"; 626 if (isPPC64) 627 O << "\t.quad dyld_stub_binding_helper\n"; 628 else 629 O << "\t.long dyld_stub_binding_helper\n"; 630 } 631 } else { 632 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); 633 i != e; ++i) { 634 SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs," 635 "pure_instructions,16", 0); 636 EmitAlignment(4); 637 O << "L" << *i << "$stub:\n"; 638 O << "\t.indirect_symbol " << *i << "\n"; 639 O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n"; 640 if (isPPC64) 641 O << "\tldu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n"; 642 else 643 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n"; 644 O << "\tmtctr r12\n"; 645 O << "\tbctr\n"; 646 SwitchToDataSection(".lazy_symbol_pointer", 0); 647 O << "L" << *i << "$lazy_ptr:\n"; 648 O << "\t.indirect_symbol " << *i << "\n"; 649 if (isPPC64) 650 O << "\t.quad dyld_stub_binding_helper\n"; 651 else 652 O << "\t.long dyld_stub_binding_helper\n"; 653 } 654 } 655 656 O << "\n"; 657 658 // Output stubs for external and common global variables. 659 if (GVStubs.begin() != GVStubs.end()) { 660 SwitchToDataSection(".non_lazy_symbol_pointer", 0); 661 for (std::set<std::string>::iterator I = GVStubs.begin(), 662 E = GVStubs.end(); I != E; ++I) { 663 O << "L" << *I << "$non_lazy_ptr:\n"; 664 O << "\t.indirect_symbol " << *I << "\n"; 665 if (isPPC64) 666 O << "\t.quad\t0\n"; 667 else 668 O << "\t.long\t0\n"; 669 670 } 671 } 672 673 // Emit initial debug information. 674 DW.EndModule(); 675 676 // Funny Darwin hack: This flag tells the linker that no global symbols 677 // contain code that falls through to other global symbols (e.g. the obvious 678 // implementation of multiple entry points). If this doesn't occur, the 679 // linker can safely perform dead code stripping. Since LLVM never generates 680 // code that does this, it is always safe to set. 681 O << "\t.subsections_via_symbols\n"; 682 683 AsmPrinter::doFinalization(M); 684 return false; // success 685} 686 687