PPCAsmPrinter.cpp revision 70d4107a45ab39e1bc3e7a67a86b59655cba34ec
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 "PPCPredicates.h" 22#include "PPCTargetMachine.h" 23#include "PPCSubtarget.h" 24#include "llvm/Constants.h" 25#include "llvm/DerivedTypes.h" 26#include "llvm/Module.h" 27#include "llvm/Assembly/Writer.h" 28#include "llvm/CodeGen/AsmPrinter.h" 29#include "llvm/CodeGen/DwarfWriter.h" 30#include "llvm/CodeGen/MachineDebugInfo.h" 31#include "llvm/CodeGen/MachineFunctionPass.h" 32#include "llvm/CodeGen/MachineInstr.h" 33#include "llvm/Support/Mangler.h" 34#include "llvm/Support/MathExtras.h" 35#include "llvm/Support/CommandLine.h" 36#include "llvm/Support/Debug.h" 37#include "llvm/Support/Compiler.h" 38#include "llvm/Target/TargetAsmInfo.h" 39#include "llvm/Target/MRegisterInfo.h" 40#include "llvm/Target/TargetInstrInfo.h" 41#include "llvm/Target/TargetOptions.h" 42#include "llvm/ADT/Statistic.h" 43#include "llvm/ADT/StringExtras.h" 44#include <set> 45using namespace llvm; 46 47STATISTIC(EmittedInsts, "Number of machine instrs printed"); 48 49namespace { 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 /// stripRegisterPrefix - This method strips the character prefix from a 91 /// register name so that only the number is left. Used by for linux asm. 92 const char *stripRegisterPrefix(const char *RegName) { 93 switch (RegName[0]) { 94 case 'r': 95 case 'f': 96 case 'v': return RegName + 1; 97 case 'c': if (RegName[1] == 'r') return RegName + 2; 98 } 99 100 return RegName; 101 } 102 103 /// printRegister - Print register according to target requirements. 104 /// 105 void printRegister(const MachineOperand &MO, bool R0AsZero) { 106 unsigned RegNo = MO.getReg(); 107 assert(MRegisterInfo::isPhysicalRegister(RegNo) && "Not physreg??"); 108 109 // If we should use 0 for R0. 110 if (R0AsZero && RegNo == PPC::R0) { 111 O << "0"; 112 return; 113 } 114 115 const char *RegName = TM.getRegisterInfo()->get(RegNo).Name; 116 // Linux assembler (Others?) does not take register mnemonics. 117 // FIXME - What about special registers used in mfspr/mtspr? 118 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName); 119 O << RegName; 120 } 121 122 void printOperand(const MachineInstr *MI, unsigned OpNo) { 123 const MachineOperand &MO = MI->getOperand(OpNo); 124 if (MO.isRegister()) { 125 printRegister(MO, false); 126 } else if (MO.isImmediate()) { 127 O << MO.getImmedValue(); 128 } else { 129 printOp(MO); 130 } 131 } 132 133 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 134 unsigned AsmVariant, const char *ExtraCode); 135 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 136 unsigned AsmVariant, const char *ExtraCode); 137 138 139 void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) { 140 char value = MI->getOperand(OpNo).getImmedValue(); 141 value = (value << (32-5)) >> (32-5); 142 O << (int)value; 143 } 144 void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) { 145 unsigned char value = MI->getOperand(OpNo).getImmedValue(); 146 assert(value <= 31 && "Invalid u5imm argument!"); 147 O << (unsigned int)value; 148 } 149 void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) { 150 unsigned char value = MI->getOperand(OpNo).getImmedValue(); 151 assert(value <= 63 && "Invalid u6imm argument!"); 152 O << (unsigned int)value; 153 } 154 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) { 155 O << (short)MI->getOperand(OpNo).getImmedValue(); 156 } 157 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) { 158 O << (unsigned short)MI->getOperand(OpNo).getImmedValue(); 159 } 160 void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) { 161 if (MI->getOperand(OpNo).isImmediate()) { 162 O << (short)(MI->getOperand(OpNo).getImmedValue()*4); 163 } else { 164 O << "lo16("; 165 printOp(MI->getOperand(OpNo)); 166 if (TM.getRelocationModel() == Reloc::PIC_) 167 O << "-\"L" << getFunctionNumber() << "$pb\")"; 168 else 169 O << ')'; 170 } 171 } 172 void printBranchOperand(const MachineInstr *MI, unsigned OpNo) { 173 // Branches can take an immediate operand. This is used by the branch 174 // selection pass to print $+8, an eight byte displacement from the PC. 175 if (MI->getOperand(OpNo).isImmediate()) { 176 O << "$+" << MI->getOperand(OpNo).getImmedValue()*4; 177 } else { 178 printOp(MI->getOperand(OpNo)); 179 } 180 } 181 void printCallOperand(const MachineInstr *MI, unsigned OpNo) { 182 const MachineOperand &MO = MI->getOperand(OpNo); 183 if (TM.getRelocationModel() != Reloc::Static) { 184 if (MO.getType() == MachineOperand::MO_GlobalAddress) { 185 GlobalValue *GV = MO.getGlobal(); 186 if (((GV->isExternal() || GV->hasWeakLinkage() || 187 GV->hasLinkOnceLinkage()))) { 188 // Dynamically-resolved functions need a stub for the function. 189 std::string Name = Mang->getValueName(GV); 190 FnStubs.insert(Name); 191 O << "L" << Name << "$stub"; 192 if (GV->hasExternalWeakLinkage()) 193 ExtWeakSymbols.insert(GV); 194 return; 195 } 196 } 197 if (MO.getType() == MachineOperand::MO_ExternalSymbol) { 198 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName(); 199 FnStubs.insert(Name); 200 O << "L" << Name << "$stub"; 201 return; 202 } 203 } 204 205 printOp(MI->getOperand(OpNo)); 206 } 207 void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) { 208 O << (int)MI->getOperand(OpNo).getImmedValue()*4; 209 } 210 void printPICLabel(const MachineInstr *MI, unsigned OpNo) { 211 O << "\"L" << getFunctionNumber() << "$pb\"\n"; 212 O << "\"L" << getFunctionNumber() << "$pb\":"; 213 } 214 void printSymbolHi(const MachineInstr *MI, unsigned OpNo) { 215 if (MI->getOperand(OpNo).isImmediate()) { 216 printS16ImmOperand(MI, OpNo); 217 } else { 218 O << "ha16("; 219 printOp(MI->getOperand(OpNo)); 220 if (TM.getRelocationModel() == Reloc::PIC_) 221 O << "-\"L" << getFunctionNumber() << "$pb\")"; 222 else 223 O << ')'; 224 } 225 } 226 void printSymbolLo(const MachineInstr *MI, unsigned OpNo) { 227 if (MI->getOperand(OpNo).isImmediate()) { 228 printS16ImmOperand(MI, OpNo); 229 } else { 230 O << "lo16("; 231 printOp(MI->getOperand(OpNo)); 232 if (TM.getRelocationModel() == Reloc::PIC_) 233 O << "-\"L" << getFunctionNumber() << "$pb\")"; 234 else 235 O << ')'; 236 } 237 } 238 void printcrbitm(const MachineInstr *MI, unsigned OpNo) { 239 unsigned CCReg = MI->getOperand(OpNo).getReg(); 240 unsigned RegNo = enumRegToMachineReg(CCReg); 241 O << (0x80 >> RegNo); 242 } 243 // The new addressing mode printers. 244 void printMemRegImm(const MachineInstr *MI, unsigned OpNo) { 245 printSymbolLo(MI, OpNo); 246 O << '('; 247 if (MI->getOperand(OpNo+1).isRegister() && 248 MI->getOperand(OpNo+1).getReg() == PPC::R0) 249 O << "0"; 250 else 251 printOperand(MI, OpNo+1); 252 O << ')'; 253 } 254 void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) { 255 if (MI->getOperand(OpNo).isImmediate()) 256 printS16X4ImmOperand(MI, OpNo); 257 else 258 printSymbolLo(MI, OpNo); 259 O << '('; 260 if (MI->getOperand(OpNo+1).isRegister() && 261 MI->getOperand(OpNo+1).getReg() == PPC::R0) 262 O << "0"; 263 else 264 printOperand(MI, OpNo+1); 265 O << ')'; 266 } 267 268 void printMemRegReg(const MachineInstr *MI, unsigned OpNo) { 269 // When used as the base register, r0 reads constant zero rather than 270 // the value contained in the register. For this reason, the darwin 271 // assembler requires that we print r0 as 0 (no r) when used as the base. 272 const MachineOperand &MO = MI->getOperand(OpNo); 273 printRegister(MO, true); 274 O << ", "; 275 printOperand(MI, OpNo+1); 276 } 277 278 void printPredicateOperand(const MachineInstr *MI, unsigned OpNo, 279 const char *Modifier); 280 281 virtual bool runOnMachineFunction(MachineFunction &F) = 0; 282 virtual bool doFinalization(Module &M) = 0; 283 }; 284 285 /// LinuxAsmPrinter - PowerPC assembly printer, customized for Linux 286 struct VISIBILITY_HIDDEN LinuxAsmPrinter : public PPCAsmPrinter { 287 288 DwarfWriter DW; 289 290 LinuxAsmPrinter(std::ostream &O, PPCTargetMachine &TM, 291 const TargetAsmInfo *T) 292 : PPCAsmPrinter(O, TM, T), DW(O, this, T) { 293 } 294 295 virtual const char *getPassName() const { 296 return "Linux 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 /// getSectionForFunction - Return the section that we should emit the 310 /// specified function body into. 311 virtual std::string getSectionForFunction(const Function &F) const; 312 }; 313 314 /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS 315 /// X 316 struct VISIBILITY_HIDDEN DarwinAsmPrinter : public PPCAsmPrinter { 317 318 DwarfWriter DW; 319 320 DarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM, 321 const TargetAsmInfo *T) 322 : PPCAsmPrinter(O, TM, T), DW(O, this, T) { 323 } 324 325 virtual const char *getPassName() const { 326 return "Darwin PPC Assembly Printer"; 327 } 328 329 bool runOnMachineFunction(MachineFunction &F); 330 bool doInitialization(Module &M); 331 bool doFinalization(Module &M); 332 333 void getAnalysisUsage(AnalysisUsage &AU) const { 334 AU.setPreservesAll(); 335 AU.addRequired<MachineDebugInfo>(); 336 PPCAsmPrinter::getAnalysisUsage(AU); 337 } 338 339 /// getSectionForFunction - Return the section that we should emit the 340 /// specified function body into. 341 virtual std::string getSectionForFunction(const Function &F) const; 342 }; 343} // end of anonymous namespace 344 345// Include the auto-generated portion of the assembly writer 346#include "PPCGenAsmWriter.inc" 347 348void PPCAsmPrinter::printOp(const MachineOperand &MO) { 349 switch (MO.getType()) { 350 case MachineOperand::MO_Immediate: 351 cerr << "printOp() does not handle immediate values\n"; 352 abort(); 353 return; 354 355 case MachineOperand::MO_MachineBasicBlock: 356 printBasicBlockLabel(MO.getMachineBasicBlock()); 357 return; 358 case MachineOperand::MO_JumpTableIndex: 359 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() 360 << '_' << MO.getJumpTableIndex(); 361 // FIXME: PIC relocation model 362 return; 363 case MachineOperand::MO_ConstantPoolIndex: 364 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() 365 << '_' << MO.getConstantPoolIndex(); 366 return; 367 case MachineOperand::MO_ExternalSymbol: 368 // Computing the address of an external symbol, not calling it. 369 if (TM.getRelocationModel() != Reloc::Static) { 370 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName(); 371 GVStubs.insert(Name); 372 O << "L" << Name << "$non_lazy_ptr"; 373 return; 374 } 375 O << TAI->getGlobalPrefix() << MO.getSymbolName(); 376 return; 377 case MachineOperand::MO_GlobalAddress: { 378 // Computing the address of a global symbol, not calling it. 379 GlobalValue *GV = MO.getGlobal(); 380 std::string Name = Mang->getValueName(GV); 381 382 // External or weakly linked global variables need non-lazily-resolved stubs 383 if (TM.getRelocationModel() != Reloc::Static) { 384 if (((GV->isExternal() || GV->hasWeakLinkage() || 385 GV->hasLinkOnceLinkage()))) { 386 GVStubs.insert(Name); 387 O << "L" << Name << "$non_lazy_ptr"; 388 return; 389 } 390 } 391 O << Name; 392 393 if (GV->hasExternalWeakLinkage()) 394 ExtWeakSymbols.insert(GV); 395 return; 396 } 397 398 default: 399 O << "<unknown operand type: " << MO.getType() << ">"; 400 return; 401 } 402} 403 404/// PrintAsmOperand - Print out an operand for an inline asm expression. 405/// 406bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 407 unsigned AsmVariant, 408 const char *ExtraCode) { 409 // Does this asm operand have a single letter operand modifier? 410 if (ExtraCode && ExtraCode[0]) { 411 if (ExtraCode[1] != 0) return true; // Unknown modifier. 412 413 switch (ExtraCode[0]) { 414 default: return true; // Unknown modifier. 415 case 'L': // Write second word of DImode reference. 416 // Verify that this operand has two consecutive registers. 417 if (!MI->getOperand(OpNo).isRegister() || 418 OpNo+1 == MI->getNumOperands() || 419 !MI->getOperand(OpNo+1).isRegister()) 420 return true; 421 ++OpNo; // Return the high-part. 422 break; 423 } 424 } 425 426 printOperand(MI, OpNo); 427 return false; 428} 429 430bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, 431 unsigned AsmVariant, 432 const char *ExtraCode) { 433 if (ExtraCode && ExtraCode[0]) 434 return true; // Unknown modifier. 435 printMemRegReg(MI, OpNo); 436 return false; 437} 438 439void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo, 440 const char *Modifier) { 441 assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!"); 442 unsigned Code = MI->getOperand(OpNo).getImm(); 443 if (!strcmp(Modifier, "cc")) { 444 switch ((PPC::Predicate)Code) { 445 case PPC::PRED_ALWAYS: return; // Don't print anything for always. 446 case PPC::PRED_LT: O << "lt"; return; 447 case PPC::PRED_LE: O << "le"; return; 448 case PPC::PRED_EQ: O << "eq"; return; 449 case PPC::PRED_GE: O << "ge"; return; 450 case PPC::PRED_GT: O << "gt"; return; 451 case PPC::PRED_NE: O << "ne"; return; 452 case PPC::PRED_UN: O << "un"; return; 453 case PPC::PRED_NU: O << "nu"; return; 454 } 455 456 } else { 457 assert(!strcmp(Modifier, "reg") && 458 "Need to specify 'cc' or 'reg' as predicate op modifier!"); 459 // Don't print the register for 'always'. 460 if (Code == PPC::PRED_ALWAYS) return; 461 printOperand(MI, OpNo+1); 462 } 463} 464 465 466/// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to 467/// the current output stream. 468/// 469void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) { 470 ++EmittedInsts; 471 472 // Check for slwi/srwi mnemonics. 473 if (MI->getOpcode() == PPC::RLWINM) { 474 bool FoundMnemonic = false; 475 unsigned char SH = MI->getOperand(2).getImmedValue(); 476 unsigned char MB = MI->getOperand(3).getImmedValue(); 477 unsigned char ME = MI->getOperand(4).getImmedValue(); 478 if (SH <= 31 && MB == 0 && ME == (31-SH)) { 479 O << "slwi "; FoundMnemonic = true; 480 } 481 if (SH <= 31 && MB == (32-SH) && ME == 31) { 482 O << "srwi "; FoundMnemonic = true; 483 SH = 32-SH; 484 } 485 if (FoundMnemonic) { 486 printOperand(MI, 0); 487 O << ", "; 488 printOperand(MI, 1); 489 O << ", " << (unsigned int)SH << "\n"; 490 return; 491 } 492 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) { 493 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) { 494 O << "mr "; 495 printOperand(MI, 0); 496 O << ", "; 497 printOperand(MI, 1); 498 O << "\n"; 499 return; 500 } 501 } else if (MI->getOpcode() == PPC::RLDICR) { 502 unsigned char SH = MI->getOperand(2).getImmedValue(); 503 unsigned char ME = MI->getOperand(3).getImmedValue(); 504 // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH 505 if (63-SH == ME) { 506 O << "sldi "; 507 printOperand(MI, 0); 508 O << ", "; 509 printOperand(MI, 1); 510 O << ", " << (unsigned int)SH << "\n"; 511 return; 512 } 513 } 514 515 if (printInstruction(MI)) 516 return; // Printer was automatically generated 517 518 assert(0 && "Unhandled instruction in asm writer!"); 519 abort(); 520 return; 521} 522 523/// runOnMachineFunction - This uses the printMachineInstruction() 524/// method to print assembly for each instruction. 525/// 526bool LinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) { 527 DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>()); 528 529 SetupMachineFunction(MF); 530 O << "\n\n"; 531 532 // Print out constants referenced by the function 533 EmitConstantPool(MF.getConstantPool()); 534 535 // Print out labels for the function. 536 const Function *F = MF.getFunction(); 537 SwitchToTextSection(getSectionForFunction(*F).c_str(), F); 538 539 switch (F->getLinkage()) { 540 default: assert(0 && "Unknown linkage type!"); 541 case Function::InternalLinkage: // Symbols default to internal. 542 break; 543 case Function::ExternalLinkage: 544 O << "\t.global\t" << CurrentFnName << '\n' 545 << "\t.type\t" << CurrentFnName << ", @function\n"; 546 break; 547 case Function::WeakLinkage: 548 case Function::LinkOnceLinkage: 549 O << "\t.global\t" << CurrentFnName << '\n'; 550 O << "\t.weak\t" << CurrentFnName << '\n'; 551 break; 552 } 553 554 if (F->hasHiddenVisibility()) 555 if (const char *Directive = TAI->getHiddenDirective()) 556 O << Directive << CurrentFnName << "\n"; 557 558 EmitAlignment(2, F); 559 O << CurrentFnName << ":\n"; 560 561 // Emit pre-function debug information. 562 DW.BeginFunction(&MF); 563 564 // Print out code for the function. 565 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); 566 I != E; ++I) { 567 // Print a label for the basic block. 568 if (I != MF.begin()) { 569 printBasicBlockLabel(I, true); 570 O << '\n'; 571 } 572 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); 573 II != E; ++II) { 574 // Print the assembly for the instruction. 575 O << "\t"; 576 printMachineInstruction(II); 577 } 578 } 579 580 O << "\t.size\t" << CurrentFnName << ",.-" << CurrentFnName << "\n"; 581 582 // Print out jump tables referenced by the function. 583 EmitJumpTableInfo(MF.getJumpTableInfo(), MF); 584 585 // Emit post-function debug information. 586 DW.EndFunction(); 587 588 // We didn't modify anything. 589 return false; 590} 591 592bool LinuxAsmPrinter::doInitialization(Module &M) { 593 AsmPrinter::doInitialization(M); 594 595 // GNU as handles section names wrapped in quotes 596 Mang->setUseQuotes(true); 597 598 SwitchToTextSection(TAI->getTextSection()); 599 600 // Emit initial debug information. 601 DW.BeginModule(&M); 602 return false; 603} 604 605bool LinuxAsmPrinter::doFinalization(Module &M) { 606 const TargetData *TD = TM.getTargetData(); 607 608 // Print out module-level global variables here. 609 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 610 I != E; ++I) { 611 if (!I->hasInitializer()) continue; // External global require no code 612 613 // Check to see if this is a special global used by LLVM, if so, emit it. 614 if (EmitSpecialLLVMGlobal(I)) 615 continue; 616 617 std::string name = Mang->getValueName(I); 618 619 if (I->hasHiddenVisibility()) 620 if (const char *Directive = TAI->getHiddenDirective()) 621 O << Directive << name << "\n"; 622 623 Constant *C = I->getInitializer(); 624 unsigned Size = TD->getTypeSize(C->getType()); 625 unsigned Align = TD->getPreferredAlignmentLog(I); 626 627 if (C->isNullValue() && /* FIXME: Verify correct */ 628 (I->hasInternalLinkage() || I->hasWeakLinkage() || 629 I->hasLinkOnceLinkage() || 630 (I->hasExternalLinkage() && !I->hasSection()))) { 631 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 632 if (I->hasExternalLinkage()) { 633 O << "\t.global " << name << '\n'; 634 O << "\t.type " << name << ", @object\n"; 635 //O << "\t.zerofill __DATA, __common, " << name << ", " 636 // << Size << ", " << Align; 637 } else if (I->hasInternalLinkage()) { 638 SwitchToDataSection("\t.data", I); 639 O << TAI->getLCOMMDirective() << name << "," << Size; 640 } else { 641 SwitchToDataSection("\t.data", I); 642 O << ".comm " << name << "," << Size; 643 } 644 O << "\t\t" << TAI->getCommentString() << " '" << I->getName() << "'\n"; 645 } else { 646 switch (I->getLinkage()) { 647 case GlobalValue::LinkOnceLinkage: 648 case GlobalValue::WeakLinkage: 649 O << "\t.global " << name << '\n' 650 << "\t.type " << name << ", @object\n" 651 << "\t.weak " << name << '\n'; 652 SwitchToDataSection("\t.data", I); 653 break; 654 case GlobalValue::AppendingLinkage: 655 // FIXME: appending linkage variables should go into a section of 656 // their name or something. For now, just emit them as external. 657 case GlobalValue::ExternalLinkage: 658 // If external or appending, declare as a global symbol 659 O << "\t.global " << name << "\n" 660 << "\t.type " << name << ", @object\n"; 661 // FALL THROUGH 662 case GlobalValue::InternalLinkage: 663 if (I->isConstant()) { 664 const ConstantArray *CVA = dyn_cast<ConstantArray>(C); 665 if (TAI->getCStringSection() && CVA && CVA->isCString()) { 666 SwitchToDataSection(TAI->getCStringSection(), I); 667 break; 668 } 669 } 670 671 // FIXME: special handling for ".ctors" & ".dtors" sections 672 if (I->hasSection() && 673 (I->getSection() == ".ctors" || 674 I->getSection() == ".dtors")) { 675 std::string SectionName = ".section " + I->getSection() 676 + ",\"aw\",@progbits"; 677 SwitchToDataSection(SectionName.c_str()); 678 } else { 679 SwitchToDataSection(TAI->getDataSection(), I); 680 } 681 break; 682 default: 683 cerr << "Unknown linkage type!"; 684 abort(); 685 } 686 687 EmitAlignment(Align, I); 688 O << name << ":\t\t\t\t" << TAI->getCommentString() << " '" 689 << I->getName() << "'\n"; 690 691 // If the initializer is a extern weak symbol, remember to emit the weak 692 // reference! 693 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C)) 694 if (GV->hasExternalWeakLinkage()) 695 ExtWeakSymbols.insert(GV); 696 697 EmitGlobalConstant(C); 698 O << '\n'; 699 } 700 } 701 702 // TODO 703 704 // Emit initial debug information. 705 DW.EndModule(); 706 707 AsmPrinter::doFinalization(M); 708 return false; // success 709} 710 711std::string LinuxAsmPrinter::getSectionForFunction(const Function &F) const { 712 switch (F.getLinkage()) { 713 default: assert(0 && "Unknown linkage type!"); 714 case Function::ExternalLinkage: 715 case Function::InternalLinkage: return TAI->getTextSection(); 716 case Function::WeakLinkage: 717 case Function::LinkOnceLinkage: 718 return ".text"; 719 } 720} 721 722std::string DarwinAsmPrinter::getSectionForFunction(const Function &F) const { 723 switch (F.getLinkage()) { 724 default: assert(0 && "Unknown linkage type!"); 725 case Function::ExternalLinkage: 726 case Function::InternalLinkage: return TAI->getTextSection(); 727 case Function::WeakLinkage: 728 case Function::LinkOnceLinkage: 729 return ".section __TEXT,__textcoal_nt,coalesced,pure_instructions"; 730 } 731} 732 733/// runOnMachineFunction - This uses the printMachineInstruction() 734/// method to print assembly for each instruction. 735/// 736bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) { 737 DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>()); 738 739 SetupMachineFunction(MF); 740 O << "\n\n"; 741 742 // Print out constants referenced by the function 743 EmitConstantPool(MF.getConstantPool()); 744 745 // Print out labels for the function. 746 const Function *F = MF.getFunction(); 747 SwitchToTextSection(getSectionForFunction(*F).c_str(), F); 748 749 switch (F->getLinkage()) { 750 default: assert(0 && "Unknown linkage type!"); 751 case Function::InternalLinkage: // Symbols default to internal. 752 break; 753 case Function::ExternalLinkage: 754 O << "\t.globl\t" << CurrentFnName << "\n"; 755 break; 756 case Function::WeakLinkage: 757 case Function::LinkOnceLinkage: 758 O << "\t.globl\t" << CurrentFnName << "\n"; 759 O << "\t.weak_definition\t" << CurrentFnName << "\n"; 760 break; 761 } 762 763 if (F->hasHiddenVisibility()) 764 if (const char *Directive = TAI->getHiddenDirective()) 765 O << Directive << CurrentFnName << "\n"; 766 767 EmitAlignment(4, F); 768 O << CurrentFnName << ":\n"; 769 770 // Emit pre-function debug information. 771 DW.BeginFunction(&MF); 772 773 // Print out code for the function. 774 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); 775 I != E; ++I) { 776 // Print a label for the basic block. 777 if (I != MF.begin()) { 778 printBasicBlockLabel(I, true); 779 O << '\n'; 780 } 781 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); 782 II != E; ++II) { 783 // Print the assembly for the instruction. 784 O << "\t"; 785 printMachineInstruction(II); 786 } 787 } 788 789 // Print out jump tables referenced by the function. 790 EmitJumpTableInfo(MF.getJumpTableInfo(), MF); 791 792 // Emit post-function debug information. 793 DW.EndFunction(); 794 795 // We didn't modify anything. 796 return false; 797} 798 799 800bool DarwinAsmPrinter::doInitialization(Module &M) { 801 static const char *CPUDirectives[] = { 802 "ppc", 803 "ppc601", 804 "ppc602", 805 "ppc603", 806 "ppc7400", 807 "ppc750", 808 "ppc970", 809 "ppc64" 810 }; 811 812 unsigned Directive = Subtarget.getDarwinDirective(); 813 if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970) 814 Directive = PPC::DIR_970; 815 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400) 816 Directive = PPC::DIR_7400; 817 if (Subtarget.isPPC64() && Directive < PPC::DIR_970) 818 Directive = PPC::DIR_64; 819 assert(Directive <= PPC::DIR_64 && "Directive out of range."); 820 O << "\t.machine " << CPUDirectives[Directive] << "\n"; 821 822 AsmPrinter::doInitialization(M); 823 824 // Darwin wants symbols to be quoted if they have complex names. 825 Mang->setUseQuotes(true); 826 827 // Prime text sections so they are adjacent. This reduces the likelihood a 828 // large data or debug section causes a branch to exceed 16M limit. 829 SwitchToTextSection(".section __TEXT,__textcoal_nt,coalesced," 830 "pure_instructions"); 831 if (TM.getRelocationModel() == Reloc::PIC_) { 832 SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs," 833 "pure_instructions,32"); 834 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) { 835 SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs," 836 "pure_instructions,16"); 837 } 838 SwitchToTextSection(TAI->getTextSection()); 839 840 // Emit initial debug information. 841 DW.BeginModule(&M); 842 return false; 843} 844 845bool DarwinAsmPrinter::doFinalization(Module &M) { 846 const TargetData *TD = TM.getTargetData(); 847 848 // Print out module-level global variables here. 849 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 850 I != E; ++I) { 851 if (!I->hasInitializer()) continue; // External global require no code 852 853 // Check to see if this is a special global used by LLVM, if so, emit it. 854 if (EmitSpecialLLVMGlobal(I)) 855 continue; 856 857 std::string name = Mang->getValueName(I); 858 859 if (I->hasHiddenVisibility()) 860 if (const char *Directive = TAI->getHiddenDirective()) 861 O << Directive << name << "\n"; 862 863 Constant *C = I->getInitializer(); 864 unsigned Size = TD->getTypeSize(C->getType()); 865 unsigned Align = TD->getPreferredAlignmentLog(I); 866 867 if (C->isNullValue() && /* FIXME: Verify correct */ 868 (I->hasInternalLinkage() || I->hasWeakLinkage() || 869 I->hasLinkOnceLinkage() || 870 (I->hasExternalLinkage() && !I->hasSection()))) { 871 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 872 if (I->hasExternalLinkage()) { 873 O << "\t.globl " << name << '\n'; 874 O << "\t.zerofill __DATA, __common, " << name << ", " 875 << Size << ", " << Align; 876 } else if (I->hasInternalLinkage()) { 877 SwitchToDataSection("\t.data", I); 878 O << TAI->getLCOMMDirective() << name << "," << Size << "," << Align; 879 } else { 880 SwitchToDataSection("\t.data", I); 881 O << ".comm " << name << "," << Size; 882 } 883 O << "\t\t" << TAI->getCommentString() << " '" << I->getName() << "'\n"; 884 } else { 885 switch (I->getLinkage()) { 886 case GlobalValue::LinkOnceLinkage: 887 case GlobalValue::WeakLinkage: 888 O << "\t.globl " << name << '\n' 889 << "\t.weak_definition " << name << '\n'; 890 SwitchToDataSection(".section __DATA,__datacoal_nt,coalesced", I); 891 break; 892 case GlobalValue::AppendingLinkage: 893 // FIXME: appending linkage variables should go into a section of 894 // their name or something. For now, just emit them as external. 895 case GlobalValue::ExternalLinkage: 896 // If external or appending, declare as a global symbol 897 O << "\t.globl " << name << "\n"; 898 // FALL THROUGH 899 case GlobalValue::InternalLinkage: 900 if (I->isConstant()) { 901 const ConstantArray *CVA = dyn_cast<ConstantArray>(C); 902 if (TAI->getCStringSection() && CVA && CVA->isCString()) { 903 SwitchToDataSection(TAI->getCStringSection(), I); 904 break; 905 } 906 } 907 908 SwitchToDataSection("\t.data", I); 909 break; 910 default: 911 cerr << "Unknown linkage type!"; 912 abort(); 913 } 914 915 EmitAlignment(Align, I); 916 O << name << ":\t\t\t\t" << TAI->getCommentString() << " '" 917 << I->getName() << "'\n"; 918 919 // If the initializer is a extern weak symbol, remember to emit the weak 920 // reference! 921 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C)) 922 if (GV->hasExternalWeakLinkage()) 923 ExtWeakSymbols.insert(GV); 924 925 EmitGlobalConstant(C); 926 O << '\n'; 927 } 928 } 929 930 bool isPPC64 = TD->getPointerSizeInBits() == 64; 931 932 // Output stubs for dynamically-linked functions 933 if (TM.getRelocationModel() == Reloc::PIC_) { 934 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); 935 i != e; ++i) { 936 SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs," 937 "pure_instructions,32"); 938 EmitAlignment(4); 939 O << "L" << *i << "$stub:\n"; 940 O << "\t.indirect_symbol " << *i << "\n"; 941 O << "\tmflr r0\n"; 942 O << "\tbcl 20,31,L0$" << *i << "\n"; 943 O << "L0$" << *i << ":\n"; 944 O << "\tmflr r11\n"; 945 O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n"; 946 O << "\tmtlr r0\n"; 947 if (isPPC64) 948 O << "\tldu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; 949 else 950 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; 951 O << "\tmtctr r12\n"; 952 O << "\tbctr\n"; 953 SwitchToDataSection(".lazy_symbol_pointer"); 954 O << "L" << *i << "$lazy_ptr:\n"; 955 O << "\t.indirect_symbol " << *i << "\n"; 956 if (isPPC64) 957 O << "\t.quad dyld_stub_binding_helper\n"; 958 else 959 O << "\t.long dyld_stub_binding_helper\n"; 960 } 961 } else { 962 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); 963 i != e; ++i) { 964 SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs," 965 "pure_instructions,16"); 966 EmitAlignment(4); 967 O << "L" << *i << "$stub:\n"; 968 O << "\t.indirect_symbol " << *i << "\n"; 969 O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n"; 970 if (isPPC64) 971 O << "\tldu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n"; 972 else 973 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n"; 974 O << "\tmtctr r12\n"; 975 O << "\tbctr\n"; 976 SwitchToDataSection(".lazy_symbol_pointer"); 977 O << "L" << *i << "$lazy_ptr:\n"; 978 O << "\t.indirect_symbol " << *i << "\n"; 979 if (isPPC64) 980 O << "\t.quad dyld_stub_binding_helper\n"; 981 else 982 O << "\t.long dyld_stub_binding_helper\n"; 983 } 984 } 985 986 O << "\n"; 987 988 // Output stubs for external and common global variables. 989 if (GVStubs.begin() != GVStubs.end()) { 990 SwitchToDataSection(".non_lazy_symbol_pointer"); 991 for (std::set<std::string>::iterator I = GVStubs.begin(), 992 E = GVStubs.end(); I != E; ++I) { 993 O << "L" << *I << "$non_lazy_ptr:\n"; 994 O << "\t.indirect_symbol " << *I << "\n"; 995 if (isPPC64) 996 O << "\t.quad\t0\n"; 997 else 998 O << "\t.long\t0\n"; 999 1000 } 1001 } 1002 1003 // Emit initial debug information. 1004 DW.EndModule(); 1005 1006 // Funny Darwin hack: This flag tells the linker that no global symbols 1007 // contain code that falls through to other global symbols (e.g. the obvious 1008 // implementation of multiple entry points). If this doesn't occur, the 1009 // linker can safely perform dead code stripping. Since LLVM never generates 1010 // code that does this, it is always safe to set. 1011 O << "\t.subsections_via_symbols\n"; 1012 1013 AsmPrinter::doFinalization(M); 1014 return false; // success 1015} 1016 1017 1018 1019/// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code 1020/// for a MachineFunction to the given output stream, in a format that the 1021/// Darwin assembler can deal with. 1022/// 1023FunctionPass *llvm::createPPCAsmPrinterPass(std::ostream &o, 1024 PPCTargetMachine &tm) { 1025 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>(); 1026 1027 if (Subtarget->isDarwin()) { 1028 return new DarwinAsmPrinter(o, tm, tm.getTargetAsmInfo()); 1029 } else { 1030 return new LinuxAsmPrinter(o, tm, tm.getTargetAsmInfo()); 1031 } 1032} 1033 1034