PPCAsmPrinter.cpp revision 9b7ce7da820ada2cdada185de9c9aa94298e485e
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 const PPCSubtarget &Subtarget; 53 54 PPCAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T) 55 : AsmPrinter(O, TM, T), Subtarget(TM.getSubtarget<PPCSubtarget>()) { 56 } 57 58 virtual const char *getPassName() const { 59 return "PowerPC Assembly Printer"; 60 } 61 62 PPCTargetMachine &getTM() { 63 return static_cast<PPCTargetMachine&>(TM); 64 } 65 66 unsigned enumRegToMachineReg(unsigned enumReg) { 67 switch (enumReg) { 68 default: assert(0 && "Unhandled register!"); break; 69 case PPC::CR0: return 0; 70 case PPC::CR1: return 1; 71 case PPC::CR2: return 2; 72 case PPC::CR3: return 3; 73 case PPC::CR4: return 4; 74 case PPC::CR5: return 5; 75 case PPC::CR6: return 6; 76 case PPC::CR7: return 7; 77 } 78 abort(); 79 } 80 81 /// printInstruction - This method is automatically generated by tablegen 82 /// from the instruction set description. This method returns true if the 83 /// machine instruction was sufficiently described to print it, otherwise it 84 /// returns false. 85 bool printInstruction(const MachineInstr *MI); 86 87 void printMachineInstruction(const MachineInstr *MI); 88 void printOp(const MachineOperand &MO); 89 90 void printOperand(const MachineInstr *MI, unsigned OpNo) { 91 const MachineOperand &MO = MI->getOperand(OpNo); 92 if (MO.isRegister()) { 93 assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??"); 94 O << TM.getRegisterInfo()->get(MO.getReg()).Name; 95 } else if (MO.isImmediate()) { 96 O << MO.getImmedValue(); 97 } else { 98 printOp(MO); 99 } 100 } 101 102 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 103 unsigned AsmVariant, const char *ExtraCode); 104 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 105 unsigned AsmVariant, const char *ExtraCode); 106 107 108 void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) { 109 char value = MI->getOperand(OpNo).getImmedValue(); 110 value = (value << (32-5)) >> (32-5); 111 O << (int)value; 112 } 113 void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) { 114 unsigned char value = MI->getOperand(OpNo).getImmedValue(); 115 assert(value <= 31 && "Invalid u5imm argument!"); 116 O << (unsigned int)value; 117 } 118 void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) { 119 unsigned char value = MI->getOperand(OpNo).getImmedValue(); 120 assert(value <= 63 && "Invalid u6imm argument!"); 121 O << (unsigned int)value; 122 } 123 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) { 124 O << (short)MI->getOperand(OpNo).getImmedValue(); 125 } 126 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) { 127 O << (unsigned short)MI->getOperand(OpNo).getImmedValue(); 128 } 129 void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) { 130 O << (short)(MI->getOperand(OpNo).getImmedValue()*4); 131 } 132 void printBranchOperand(const MachineInstr *MI, unsigned OpNo) { 133 // Branches can take an immediate operand. This is used by the branch 134 // selection pass to print $+8, an eight byte displacement from the PC. 135 if (MI->getOperand(OpNo).isImmediate()) { 136 O << "$+" << MI->getOperand(OpNo).getImmedValue()*4; 137 } else { 138 printOp(MI->getOperand(OpNo)); 139 } 140 } 141 void printCallOperand(const MachineInstr *MI, unsigned OpNo) { 142 const MachineOperand &MO = MI->getOperand(OpNo); 143 if (TM.getRelocationModel() != Reloc::Static) { 144 if (MO.getType() == MachineOperand::MO_GlobalAddress) { 145 GlobalValue *GV = MO.getGlobal(); 146 if (((GV->isExternal() || GV->hasWeakLinkage() || 147 GV->hasLinkOnceLinkage()))) { 148 // Dynamically-resolved functions need a stub for the function. 149 std::string Name = Mang->getValueName(GV); 150 FnStubs.insert(Name); 151 O << "L" << Name << "$stub"; 152 return; 153 } 154 } 155 if (MO.getType() == MachineOperand::MO_ExternalSymbol) { 156 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName(); 157 FnStubs.insert(Name); 158 O << "L" << Name << "$stub"; 159 return; 160 } 161 } 162 163 printOp(MI->getOperand(OpNo)); 164 } 165 void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) { 166 O << (int)MI->getOperand(OpNo).getImmedValue()*4; 167 } 168 void printPICLabel(const MachineInstr *MI, unsigned OpNo) { 169 O << "\"L" << getFunctionNumber() << "$pb\"\n"; 170 O << "\"L" << getFunctionNumber() << "$pb\":"; 171 } 172 void printSymbolHi(const MachineInstr *MI, unsigned OpNo) { 173 if (MI->getOperand(OpNo).isImmediate()) { 174 printS16ImmOperand(MI, OpNo); 175 } else { 176 O << "ha16("; 177 printOp(MI->getOperand(OpNo)); 178 if (TM.getRelocationModel() == Reloc::PIC_) 179 O << "-\"L" << getFunctionNumber() << "$pb\")"; 180 else 181 O << ')'; 182 } 183 } 184 void printSymbolLo(const MachineInstr *MI, unsigned OpNo) { 185 if (MI->getOperand(OpNo).isImmediate()) { 186 printS16ImmOperand(MI, OpNo); 187 } else { 188 O << "lo16("; 189 printOp(MI->getOperand(OpNo)); 190 if (TM.getRelocationModel() == Reloc::PIC_) 191 O << "-\"L" << getFunctionNumber() << "$pb\")"; 192 else 193 O << ')'; 194 } 195 } 196 void printcrbitm(const MachineInstr *MI, unsigned OpNo) { 197 unsigned CCReg = MI->getOperand(OpNo).getReg(); 198 unsigned RegNo = enumRegToMachineReg(CCReg); 199 O << (0x80 >> RegNo); 200 } 201 // The new addressing mode printers. 202 void printMemRegImm(const MachineInstr *MI, unsigned OpNo) { 203 printSymbolLo(MI, OpNo); 204 O << '('; 205 if (MI->getOperand(OpNo+1).isRegister() && 206 MI->getOperand(OpNo+1).getReg() == PPC::R0) 207 O << "0"; 208 else 209 printOperand(MI, OpNo+1); 210 O << ')'; 211 } 212 void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) { 213 if (MI->getOperand(OpNo).isImmediate()) 214 printS16X4ImmOperand(MI, OpNo); 215 else 216 printSymbolLo(MI, OpNo); 217 O << '('; 218 if (MI->getOperand(OpNo+1).isRegister() && 219 MI->getOperand(OpNo+1).getReg() == PPC::R0) 220 O << "0"; 221 else 222 printOperand(MI, OpNo+1); 223 O << ')'; 224 } 225 226 void printMemRegReg(const MachineInstr *MI, unsigned OpNo) { 227 // When used as the base register, r0 reads constant zero rather than 228 // the value contained in the register. For this reason, the darwin 229 // assembler requires that we print r0 as 0 (no r) when used as the base. 230 const MachineOperand &MO = MI->getOperand(OpNo); 231 if (MO.getReg() == PPC::R0) 232 O << '0'; 233 else 234 O << TM.getRegisterInfo()->get(MO.getReg()).Name; 235 O << ", "; 236 printOperand(MI, OpNo+1); 237 } 238 239 virtual bool runOnMachineFunction(MachineFunction &F) = 0; 240 virtual bool doFinalization(Module &M) = 0; 241 }; 242 243 /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS 244 /// X 245 struct VISIBILITY_HIDDEN DarwinAsmPrinter : public PPCAsmPrinter { 246 247 DwarfWriter DW; 248 249 DarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM, 250 const TargetAsmInfo *T) 251 : PPCAsmPrinter(O, TM, T), DW(O, this, T) { 252 bool isPPC64 = Subtarget.isPPC64(); 253 } 254 255 virtual const char *getPassName() const { 256 return "Darwin PPC Assembly Printer"; 257 } 258 259 bool runOnMachineFunction(MachineFunction &F); 260 bool doInitialization(Module &M); 261 bool doFinalization(Module &M); 262 263 void getAnalysisUsage(AnalysisUsage &AU) const { 264 AU.setPreservesAll(); 265 AU.addRequired<MachineDebugInfo>(); 266 PPCAsmPrinter::getAnalysisUsage(AU); 267 } 268 269 /// getSectionForFunction - Return the section that we should emit the 270 /// specified function body into. 271 virtual std::string getSectionForFunction(const Function &F) const; 272 }; 273} // end of anonymous namespace 274 275// Include the auto-generated portion of the assembly writer 276#include "PPCGenAsmWriter.inc" 277 278void PPCAsmPrinter::printOp(const MachineOperand &MO) { 279 switch (MO.getType()) { 280 case MachineOperand::MO_Immediate: 281 std::cerr << "printOp() does not handle immediate values\n"; 282 abort(); 283 return; 284 285 case MachineOperand::MO_MachineBasicBlock: 286 printBasicBlockLabel(MO.getMachineBasicBlock()); 287 return; 288 case MachineOperand::MO_JumpTableIndex: 289 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 290 << '_' << MO.getJumpTableIndex(); 291 // FIXME: PIC relocation model 292 return; 293 case MachineOperand::MO_ConstantPoolIndex: 294 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() 295 << '_' << MO.getConstantPoolIndex(); 296 return; 297 case MachineOperand::MO_ExternalSymbol: 298 // Computing the address of an external symbol, not calling it. 299 if (TM.getRelocationModel() != Reloc::Static) { 300 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName(); 301 GVStubs.insert(Name); 302 O << "L" << Name << "$non_lazy_ptr"; 303 return; 304 } 305 O << TAI->getGlobalPrefix() << MO.getSymbolName(); 306 return; 307 case MachineOperand::MO_GlobalAddress: { 308 // Computing the address of a global symbol, not calling it. 309 GlobalValue *GV = MO.getGlobal(); 310 std::string Name = Mang->getValueName(GV); 311 int offset = MO.getOffset(); 312 313 // External or weakly linked global variables need non-lazily-resolved stubs 314 if (TM.getRelocationModel() != Reloc::Static) { 315 if (((GV->isExternal() || GV->hasWeakLinkage() || 316 GV->hasLinkOnceLinkage()))) { 317 GVStubs.insert(Name); 318 O << "L" << Name << "$non_lazy_ptr"; 319 return; 320 } 321 } 322 323 O << Name; 324 return; 325 } 326 327 default: 328 O << "<unknown operand type: " << MO.getType() << ">"; 329 return; 330 } 331} 332 333/// PrintAsmOperand - Print out an operand for an inline asm expression. 334/// 335bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 336 unsigned AsmVariant, 337 const char *ExtraCode) { 338 // Does this asm operand have a single letter operand modifier? 339 if (ExtraCode && ExtraCode[0]) { 340 if (ExtraCode[1] != 0) return true; // Unknown modifier. 341 342 switch (ExtraCode[0]) { 343 default: return true; // Unknown modifier. 344 case 'L': // Write second word of DImode reference. 345 // Verify that this operand has two consecutive registers. 346 if (!MI->getOperand(OpNo).isRegister() || 347 OpNo+1 == MI->getNumOperands() || 348 !MI->getOperand(OpNo+1).isRegister()) 349 return true; 350 ++OpNo; // Return the high-part. 351 break; 352 } 353 } 354 355 printOperand(MI, OpNo); 356 return false; 357} 358 359bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 360 unsigned AsmVariant, 361 const char *ExtraCode) { 362 if (ExtraCode && ExtraCode[0]) 363 return true; // Unknown modifier. 364 printMemRegReg(MI, OpNo); 365 return false; 366} 367 368/// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to 369/// the current output stream. 370/// 371void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) { 372 ++EmittedInsts; 373 374 // Check for slwi/srwi mnemonics. 375 if (MI->getOpcode() == PPC::RLWINM) { 376 bool FoundMnemonic = false; 377 unsigned char SH = MI->getOperand(2).getImmedValue(); 378 unsigned char MB = MI->getOperand(3).getImmedValue(); 379 unsigned char ME = MI->getOperand(4).getImmedValue(); 380 if (SH <= 31 && MB == 0 && ME == (31-SH)) { 381 O << "slwi "; FoundMnemonic = true; 382 } 383 if (SH <= 31 && MB == (32-SH) && ME == 31) { 384 O << "srwi "; FoundMnemonic = true; 385 SH = 32-SH; 386 } 387 if (FoundMnemonic) { 388 printOperand(MI, 0); 389 O << ", "; 390 printOperand(MI, 1); 391 O << ", " << (unsigned int)SH << "\n"; 392 return; 393 } 394 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) { 395 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) { 396 O << "mr "; 397 printOperand(MI, 0); 398 O << ", "; 399 printOperand(MI, 1); 400 O << "\n"; 401 return; 402 } 403 } 404 405 if (printInstruction(MI)) 406 return; // Printer was automatically generated 407 408 assert(0 && "Unhandled instruction in asm writer!"); 409 abort(); 410 return; 411} 412 413 414 415std::string DarwinAsmPrinter::getSectionForFunction(const Function &F) const { 416 switch (F.getLinkage()) { 417 default: assert(0 && "Unknown linkage type!"); 418 case Function::ExternalLinkage: 419 case Function::InternalLinkage: return TAI->getTextSection(); 420 case Function::WeakLinkage: 421 case Function::LinkOnceLinkage: 422 return ".section __TEXT,__textcoal_nt,coalesced,pure_instructions"; 423 } 424} 425 426/// runOnMachineFunction - This uses the printMachineInstruction() 427/// method to print assembly for each instruction. 428/// 429bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) { 430 DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>()); 431 432 SetupMachineFunction(MF); 433 O << "\n\n"; 434 435 // Print out constants referenced by the function 436 EmitConstantPool(MF.getConstantPool()); 437 438 // Print out labels for the function. 439 const Function *F = MF.getFunction(); 440 SwitchToTextSection(getSectionForFunction(*F).c_str(), F); 441 442 switch (F->getLinkage()) { 443 default: assert(0 && "Unknown linkage type!"); 444 case Function::InternalLinkage: // Symbols default to internal. 445 break; 446 case Function::ExternalLinkage: 447 O << "\t.globl\t" << CurrentFnName << "\n"; 448 break; 449 case Function::WeakLinkage: 450 case Function::LinkOnceLinkage: 451 O << "\t.globl\t" << CurrentFnName << "\n"; 452 O << "\t.weak_definition\t" << CurrentFnName << "\n"; 453 break; 454 } 455 EmitAlignment(4, F); 456 O << CurrentFnName << ":\n"; 457 458 // Emit pre-function debug information. 459 DW.BeginFunction(&MF); 460 461 // Print out code for the function. 462 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); 463 I != E; ++I) { 464 // Print a label for the basic block. 465 if (I != MF.begin()) { 466 printBasicBlockLabel(I, true); 467 O << '\n'; 468 } 469 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); 470 II != E; ++II) { 471 // Print the assembly for the instruction. 472 O << "\t"; 473 printMachineInstruction(II); 474 } 475 } 476 477 // Print out jump tables referenced by the function. 478 EmitJumpTableInfo(MF.getJumpTableInfo()); 479 480 // Emit post-function debug information. 481 DW.EndFunction(); 482 483 // We didn't modify anything. 484 return false; 485} 486 487 488bool DarwinAsmPrinter::doInitialization(Module &M) { 489 if (Subtarget.isGigaProcessor()) 490 O << "\t.machine ppc970\n"; 491 AsmPrinter::doInitialization(M); 492 493 // Darwin wants symbols to be quoted if they have complex names. 494 Mang->setUseQuotes(true); 495 496 // Emit initial debug information. 497 DW.BeginModule(&M); 498 return false; 499} 500 501bool DarwinAsmPrinter::doFinalization(Module &M) { 502 const TargetData *TD = TM.getTargetData(); 503 504 // Print out module-level global variables here. 505 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 506 I != E; ++I) { 507 if (!I->hasInitializer()) continue; // External global require no code 508 509 // Check to see if this is a special global used by LLVM, if so, emit it. 510 if (EmitSpecialLLVMGlobal(I)) 511 continue; 512 513 std::string name = Mang->getValueName(I); 514 Constant *C = I->getInitializer(); 515 unsigned Size = TD->getTypeSize(C->getType()); 516 unsigned Align = getPreferredAlignmentLog(I); 517 518 if (C->isNullValue() && /* FIXME: Verify correct */ 519 (I->hasInternalLinkage() || I->hasWeakLinkage() || 520 I->hasLinkOnceLinkage() || 521 (I->hasExternalLinkage() && !I->hasSection()))) { 522 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 523 if (I->hasExternalLinkage()) { 524 O << "\t.globl " << name << '\n'; 525 O << "\t.zerofill __DATA, __common, " << name << ", " 526 << Size << ", " << Align; 527 } else if (I->hasInternalLinkage()) { 528 SwitchToDataSection("\t.data", I); 529 O << TAI->getLCOMMDirective() << name << "," << Size << "," << Align; 530 } else { 531 SwitchToDataSection("\t.data", I); 532 O << ".comm " << name << "," << Size; 533 } 534 O << "\t\t; '" << I->getName() << "'\n"; 535 } else { 536 switch (I->getLinkage()) { 537 case GlobalValue::LinkOnceLinkage: 538 case GlobalValue::WeakLinkage: 539 O << "\t.globl " << name << '\n' 540 << "\t.weak_definition " << name << '\n'; 541 SwitchToDataSection(".section __DATA,__datacoal_nt,coalesced", I); 542 break; 543 case GlobalValue::AppendingLinkage: 544 // FIXME: appending linkage variables should go into a section of 545 // their name or something. For now, just emit them as external. 546 case GlobalValue::ExternalLinkage: 547 // If external or appending, declare as a global symbol 548 O << "\t.globl " << name << "\n"; 549 // FALL THROUGH 550 case GlobalValue::InternalLinkage: 551 SwitchToDataSection("\t.data", I); 552 break; 553 default: 554 std::cerr << "Unknown linkage type!"; 555 abort(); 556 } 557 558 EmitAlignment(Align, I); 559 O << name << ":\t\t\t\t; '" << I->getName() << "'\n"; 560 EmitGlobalConstant(C); 561 O << '\n'; 562 } 563 } 564 565 bool isPPC64 = TD->getPointerSizeInBits() == 64; 566 567 // Output stubs for dynamically-linked functions 568 if (TM.getRelocationModel() == Reloc::PIC_) { 569 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); 570 i != e; ++i) { 571 SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs," 572 "pure_instructions,32", 0); 573 EmitAlignment(4); 574 O << "L" << *i << "$stub:\n"; 575 O << "\t.indirect_symbol " << *i << "\n"; 576 O << "\tmflr r0\n"; 577 O << "\tbcl 20,31,L0$" << *i << "\n"; 578 O << "L0$" << *i << ":\n"; 579 O << "\tmflr r11\n"; 580 O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n"; 581 O << "\tmtlr r0\n"; 582 if (isPPC64) 583 O << "\tldu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; 584 else 585 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; 586 O << "\tmtctr r12\n"; 587 O << "\tbctr\n"; 588 SwitchToDataSection(".lazy_symbol_pointer", 0); 589 O << "L" << *i << "$lazy_ptr:\n"; 590 O << "\t.indirect_symbol " << *i << "\n"; 591 if (isPPC64) 592 O << "\t.quad dyld_stub_binding_helper\n"; 593 else 594 O << "\t.long dyld_stub_binding_helper\n"; 595 } 596 } else { 597 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); 598 i != e; ++i) { 599 SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs," 600 "pure_instructions,16", 0); 601 EmitAlignment(4); 602 O << "L" << *i << "$stub:\n"; 603 O << "\t.indirect_symbol " << *i << "\n"; 604 O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n"; 605 if (isPPC64) 606 O << "\tldu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n"; 607 else 608 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n"; 609 O << "\tmtctr r12\n"; 610 O << "\tbctr\n"; 611 SwitchToDataSection(".lazy_symbol_pointer", 0); 612 O << "L" << *i << "$lazy_ptr:\n"; 613 O << "\t.indirect_symbol " << *i << "\n"; 614 if (isPPC64) 615 O << "\t.quad dyld_stub_binding_helper\n"; 616 else 617 O << "\t.long dyld_stub_binding_helper\n"; 618 } 619 } 620 621 O << "\n"; 622 623 // Output stubs for external and common global variables. 624 if (GVStubs.begin() != GVStubs.end()) { 625 SwitchToDataSection(".non_lazy_symbol_pointer", 0); 626 for (std::set<std::string>::iterator I = GVStubs.begin(), 627 E = GVStubs.end(); I != E; ++I) { 628 O << "L" << *I << "$non_lazy_ptr:\n"; 629 O << "\t.indirect_symbol " << *I << "\n"; 630 if (isPPC64) 631 O << "\t.quad\t0\n"; 632 else 633 O << "\t.long\t0\n"; 634 635 } 636 } 637 638 // Emit initial debug information. 639 DW.EndModule(); 640 641 // Funny Darwin hack: This flag tells the linker that no global symbols 642 // contain code that falls through to other global symbols (e.g. the obvious 643 // implementation of multiple entry points). If this doesn't occur, the 644 // linker can safely perform dead code stripping. Since LLVM never generates 645 // code that does this, it is always safe to set. 646 O << "\t.subsections_via_symbols\n"; 647 648 AsmPrinter::doFinalization(M); 649 return false; // success 650} 651 652 653 654/// createDarwinCodePrinterPass - Returns a pass that prints the PPC assembly 655/// code for a MachineFunction to the given output stream, in a format that the 656/// Darwin assembler can deal with. 657/// 658FunctionPass *llvm::createPPCAsmPrinterPass(std::ostream &o, 659 PPCTargetMachine &tm) { 660 return new DarwinAsmPrinter(o, tm, tm.getTargetAsmInfo()); 661} 662 663