PPCAsmPrinter.cpp revision b5f662fa0314f7e7e690aae8ebff7136cc3a5ab0
1//===-- PowerPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly --===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file contains a printer that converts from our internal representation 11// of machine-dependent LLVM code to PowerPC assembly language. This printer is 12// the output mechanism used by `llc'. 13// 14// Documentation at http://developer.apple.com/documentation/DeveloperTools/ 15// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html 16// 17//===----------------------------------------------------------------------===// 18 19#define DEBUG_TYPE "asmprinter" 20#include "PowerPC.h" 21#include "PowerPCTargetMachine.h" 22#include "llvm/Constants.h" 23#include "llvm/DerivedTypes.h" 24#include "llvm/Module.h" 25#include "llvm/Assembly/Writer.h" 26#include "llvm/CodeGen/AsmPrinter.h" 27#include "llvm/CodeGen/MachineConstantPool.h" 28#include "llvm/CodeGen/MachineFunctionPass.h" 29#include "llvm/CodeGen/MachineInstr.h" 30#include "llvm/CodeGen/ValueTypes.h" 31#include "llvm/Support/Mangler.h" 32#include "llvm/Support/MathExtras.h" 33#include "llvm/Support/CommandLine.h" 34#include "llvm/Support/Debug.h" 35#include "llvm/Target/MRegisterInfo.h" 36#include "llvm/Target/TargetInstrInfo.h" 37#include "llvm/ADT/Statistic.h" 38#include "llvm/ADT/StringExtras.h" 39#include <set> 40using namespace llvm; 41 42namespace { 43 Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed"); 44 45 struct PowerPCAsmPrinter : public AsmPrinter { 46 std::set<std::string> FnStubs, GVStubs, LinkOnceStubs; 47 std::set<std::string> Strings; 48 49 PowerPCAsmPrinter(std::ostream &O, TargetMachine &TM) 50 : AsmPrinter(O, TM), LabelNumber(0) {} 51 52 /// Unique incrementer for label values for referencing Global values. 53 /// 54 unsigned LabelNumber; 55 56 virtual const char *getPassName() const { 57 return "PowerPC Assembly Printer"; 58 } 59 60 PowerPCTargetMachine &getTM() { 61 return static_cast<PowerPCTargetMachine&>(TM); 62 } 63 64 /// printInstruction - This method is automatically generated by tablegen 65 /// from the instruction set description. This method returns true if the 66 /// machine instruction was sufficiently described to print it, otherwise it 67 /// returns false. 68 bool printInstruction(const MachineInstr *MI); 69 70 void printMachineInstruction(const MachineInstr *MI); 71 void printOp(const MachineOperand &MO, bool IsCallOp = false); 72 73 void printOperand(const MachineInstr *MI, unsigned OpNo, MVT::ValueType VT){ 74 const MachineOperand &MO = MI->getOperand(OpNo); 75 if (MO.getType() == MachineOperand::MO_MachineRegister) { 76 assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??"); 77 O << LowercaseString(TM.getRegisterInfo()->get(MO.getReg()).Name); 78 } else if (MO.isImmediate()) { 79 O << MO.getImmedValue(); 80 } else { 81 printOp(MO); 82 } 83 } 84 85 void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo, 86 MVT::ValueType VT) { 87 unsigned char value = MI->getOperand(OpNo).getImmedValue(); 88 assert(value <= 31 && "Invalid u5imm argument!"); 89 O << (unsigned int)value; 90 } 91 void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo, 92 MVT::ValueType VT) { 93 unsigned char value = MI->getOperand(OpNo).getImmedValue(); 94 assert(value <= 63 && "Invalid u6imm argument!"); 95 O << (unsigned int)value; 96 } 97 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo, 98 MVT::ValueType VT) { 99 O << (short)MI->getOperand(OpNo).getImmedValue(); 100 } 101 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo, 102 MVT::ValueType VT) { 103 O << (unsigned short)MI->getOperand(OpNo).getImmedValue(); 104 } 105 void printBranchOperand(const MachineInstr *MI, unsigned OpNo, 106 MVT::ValueType VT) { 107 // Branches can take an immediate operand. This is used by the branch 108 // selection pass to print $+8, an eight byte displacement from the PC. 109 if (MI->getOperand(OpNo).isImmediate()) { 110 O << "$+" << MI->getOperand(OpNo).getImmedValue(); 111 } else { 112 printOp(MI->getOperand(OpNo), 113 TM.getInstrInfo()->isCall(MI->getOpcode())); 114 } 115 } 116 void printPICLabel(const MachineInstr *MI, unsigned OpNo, 117 MVT::ValueType VT) { 118 // FIXME: should probably be converted to cout.width and cout.fill 119 O << "\"L0000" << LabelNumber << "$pb\"\n"; 120 O << "\"L0000" << LabelNumber << "$pb\":"; 121 } 122 void printSymbolHi(const MachineInstr *MI, unsigned OpNo, 123 MVT::ValueType VT) { 124 O << "ha16("; 125 printOp(MI->getOperand(OpNo)); 126 O << "-\"L0000" << LabelNumber << "$pb\")"; 127 } 128 void printSymbolLo(const MachineInstr *MI, unsigned OpNo, 129 MVT::ValueType VT) { 130 // FIXME: Because LFS, LFD, and LWZ can be used either with a s16imm or 131 // a lo16 of a global or constant pool operand, we must handle both here. 132 // this isn't a great design, but it works for now. 133 if (MI->getOperand(OpNo).isImmediate()) { 134 O << (short)MI->getOperand(OpNo).getImmedValue(); 135 } else { 136 O << "lo16("; 137 printOp(MI->getOperand(OpNo)); 138 O << "-\"L0000" << LabelNumber << "$pb\")"; 139 } 140 } 141 void printcrbit(const MachineInstr *MI, unsigned OpNo, 142 MVT::ValueType VT) { 143 unsigned char value = MI->getOperand(OpNo).getImmedValue(); 144 assert(value <= 3 && "Invalid crbit argument!"); 145 unsigned RegNo, CCReg = MI->getOperand(OpNo-1).getReg(); 146 switch (CCReg) { 147 case PPC::CR0: RegNo = 0; break; 148 case PPC::CR1: RegNo = 1; break; 149 case PPC::CR2: RegNo = 2; break; 150 case PPC::CR3: RegNo = 3; break; 151 case PPC::CR4: RegNo = 4; break; 152 case PPC::CR5: RegNo = 5; break; 153 case PPC::CR6: RegNo = 6; break; 154 case PPC::CR7: RegNo = 7; break; 155 default: 156 std::cerr << "Unhandled reg in enumRegToRealReg!\n"; 157 abort(); 158 } 159 O << 4 * RegNo + value; 160 } 161 162 virtual void printConstantPool(MachineConstantPool *MCP) = 0; 163 virtual bool runOnMachineFunction(MachineFunction &F) = 0; 164 virtual bool doFinalization(Module &M) = 0; 165 }; 166 167 /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS 168 /// X 169 /// 170 struct DarwinAsmPrinter : public PowerPCAsmPrinter { 171 172 DarwinAsmPrinter(std::ostream &O, TargetMachine &TM) 173 : PowerPCAsmPrinter(O, TM) { 174 CommentString = ";"; 175 GlobalPrefix = "_"; 176 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros. 177 Data64bitsDirective = 0; // we can't emit a 64-bit unit 178 AlignmentIsInBytes = false; // Alignment is by power of 2. 179 } 180 181 virtual const char *getPassName() const { 182 return "Darwin PPC Assembly Printer"; 183 } 184 185 void printConstantPool(MachineConstantPool *MCP); 186 bool runOnMachineFunction(MachineFunction &F); 187 bool doFinalization(Module &M); 188 }; 189 190 /// AIXAsmPrinter - PowerPC assembly printer, customized for AIX 191 /// 192 struct AIXAsmPrinter : public PowerPCAsmPrinter { 193 /// Map for labels corresponding to global variables 194 /// 195 std::map<const GlobalVariable*,std::string> GVToLabelMap; 196 197 AIXAsmPrinter(std::ostream &O, TargetMachine &TM) 198 : PowerPCAsmPrinter(O, TM) { 199 CommentString = "#"; 200 GlobalPrefix = "_"; 201 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros. 202 Data64bitsDirective = 0; // we can't emit a 64-bit unit 203 AlignmentIsInBytes = false; // Alignment is by power of 2. 204 } 205 206 virtual const char *getPassName() const { 207 return "AIX PPC Assembly Printer"; 208 } 209 210 void printConstantPool(MachineConstantPool *MCP); 211 bool runOnMachineFunction(MachineFunction &F); 212 bool doInitialization(Module &M); 213 bool doFinalization(Module &M); 214 }; 215} // end of anonymous namespace 216 217// SwitchSection - Switch to the specified section of the executable if we are 218// not already in it! 219// 220static void SwitchSection(std::ostream &OS, std::string &CurSection, 221 const char *NewSection) { 222 if (CurSection != NewSection) { 223 CurSection = NewSection; 224 if (!CurSection.empty()) 225 OS << "\t" << NewSection << "\n"; 226 } 227} 228 229/// isStringCompatible - Can we treat the specified array as a string? 230/// Only if it is an array of ubytes or non-negative sbytes. 231/// 232static bool isStringCompatible(const ConstantArray *CVA) { 233 const Type *ETy = cast<ArrayType>(CVA->getType())->getElementType(); 234 if (ETy == Type::UByteTy) return true; 235 if (ETy != Type::SByteTy) return false; 236 237 for (unsigned i = 0; i < CVA->getNumOperands(); ++i) 238 if (cast<ConstantSInt>(CVA->getOperand(i))->getValue() < 0) 239 return false; 240 241 return true; 242} 243 244/// toOctal - Convert the low order bits of X into an octal digit. 245/// 246static inline char toOctal(int X) { 247 return (X&7)+'0'; 248} 249 250// Possible states while outputting ASCII strings 251namespace { 252 enum StringSection { 253 None, 254 Alpha, 255 Numeric 256 }; 257} 258 259/// SwitchStringSection - manage the changes required to output bytes as 260/// characters in a string vs. numeric decimal values 261/// 262static inline void SwitchStringSection(std::ostream &O, StringSection NewSect, 263 StringSection &Current) { 264 if (Current == None) { 265 if (NewSect == Alpha) 266 O << "\t.byte \""; 267 else if (NewSect == Numeric) 268 O << "\t.byte "; 269 } else if (Current == Alpha) { 270 if (NewSect == None) 271 O << "\""; 272 else if (NewSect == Numeric) 273 O << "\"\n" 274 << "\t.byte "; 275 } else if (Current == Numeric) { 276 if (NewSect == Alpha) 277 O << '\n' 278 << "\t.byte \""; 279 else if (NewSect == Numeric) 280 O << ", "; 281 } 282 283 Current = NewSect; 284} 285 286/// getAsCString - Return the specified array as a C compatible 287/// string, only if the predicate isStringCompatible is true. 288/// 289static void printAsCString(std::ostream &O, const ConstantArray *CVA) { 290 assert(isStringCompatible(CVA) && "Array is not string compatible!"); 291 292 if (CVA->getNumOperands() == 0) 293 return; 294 295 StringSection Current = None; 296 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i) { 297 unsigned char C = cast<ConstantInt>(CVA->getOperand(i))->getRawValue(); 298 if (C == '"') { 299 SwitchStringSection(O, Alpha, Current); 300 O << "\"\""; 301 } else if (isprint(C)) { 302 SwitchStringSection(O, Alpha, Current); 303 O << C; 304 } else { 305 SwitchStringSection(O, Numeric, Current); 306 O << utostr((unsigned)C); 307 } 308 } 309 SwitchStringSection(O, None, Current); 310 O << '\n'; 311} 312 313/// createDarwinAsmPrinterPass - Returns a pass that prints the PPC assembly 314/// code for a MachineFunction to the given output stream, in a format that the 315/// Darwin assembler can deal with. 316/// 317FunctionPass *llvm::createDarwinAsmPrinter(std::ostream &o, TargetMachine &tm) { 318 return new DarwinAsmPrinter(o, tm); 319} 320 321/// createAIXAsmPrinterPass - Returns a pass that prints the PPC assembly code 322/// for a MachineFunction to the given output stream, in a format that the 323/// AIX 5L assembler can deal with. 324/// 325FunctionPass *llvm::createAIXAsmPrinter(std::ostream &o, TargetMachine &tm) { 326 return new AIXAsmPrinter(o, tm); 327} 328 329// Include the auto-generated portion of the assembly writer 330#include "PowerPCGenAsmWriter.inc" 331 332void PowerPCAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) { 333 const MRegisterInfo &RI = *TM.getRegisterInfo(); 334 int new_symbol; 335 336 switch (MO.getType()) { 337 case MachineOperand::MO_VirtualRegister: 338 if (Value *V = MO.getVRegValueOrNull()) { 339 O << "<" << V->getName() << ">"; 340 return; 341 } 342 // FALLTHROUGH 343 case MachineOperand::MO_MachineRegister: 344 case MachineOperand::MO_CCRegister: 345 O << LowercaseString(RI.get(MO.getReg()).Name); 346 return; 347 348 case MachineOperand::MO_SignExtendedImmed: 349 case MachineOperand::MO_UnextendedImmed: 350 std::cerr << "printOp() does not handle immediate values\n"; 351 abort(); 352 return; 353 354 case MachineOperand::MO_PCRelativeDisp: 355 std::cerr << "Shouldn't use addPCDisp() when building PPC MachineInstrs"; 356 abort(); 357 return; 358 359 case MachineOperand::MO_MachineBasicBlock: { 360 MachineBasicBlock *MBBOp = MO.getMachineBasicBlock(); 361 O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction()) 362 << "_" << MBBOp->getNumber() << "\t; " 363 << MBBOp->getBasicBlock()->getName(); 364 return; 365 } 366 367 case MachineOperand::MO_ConstantPoolIndex: 368 O << ".CPI" << CurrentFnName << "_" << MO.getConstantPoolIndex(); 369 return; 370 371 case MachineOperand::MO_ExternalSymbol: 372 if (IsCallOp) { 373 std::string Name(GlobalPrefix); Name += MO.getSymbolName(); 374 FnStubs.insert(Name); 375 O << "L" << Name << "$stub"; 376 return; 377 } 378 O << GlobalPrefix << MO.getSymbolName(); 379 return; 380 381 case MachineOperand::MO_GlobalAddress: { 382 GlobalValue *GV = MO.getGlobal(); 383 std::string Name = Mang->getValueName(GV); 384 385 // Dynamically-resolved functions need a stub for the function. Be 386 // wary however not to output $stub for external functions whose addresses 387 // are taken. Those should be emitted as $non_lazy_ptr below. 388 Function *F = dyn_cast<Function>(GV); 389 if (F && IsCallOp && F->isExternal()) { 390 FnStubs.insert(Name); 391 O << "L" << Name << "$stub"; 392 return; 393 } 394 395 // External or weakly linked global variables need non-lazily-resolved stubs 396 if ((GV->isExternal() || GV->hasWeakLinkage() || GV->hasLinkOnceLinkage())){ 397 if (GV->hasLinkOnceLinkage()) 398 LinkOnceStubs.insert(Name); 399 else 400 GVStubs.insert(Name); 401 O << "L" << Name << "$non_lazy_ptr"; 402 return; 403 } 404 405 O << Mang->getValueName(GV); 406 return; 407 } 408 409 default: 410 O << "<unknown operand type: " << MO.getType() << ">"; 411 return; 412 } 413} 414 415/// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to 416/// the current output stream. 417/// 418void PowerPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) { 419 ++EmittedInsts; 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, MVT::i64); 435 O << ", "; 436 printOperand(MI, 1, MVT::i64); 437 O << ", " << (unsigned int)SH << "\n"; 438 return; 439 } 440 } 441 442 if (printInstruction(MI)) 443 return; // Printer was automatically generated 444 445 assert(0 && "Unhandled instruction in asm writer!"); 446 abort(); 447 return; 448} 449 450/// runOnMachineFunction - This uses the printMachineInstruction() 451/// method to print assembly for each instruction. 452/// 453bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) { 454 setupMachineFunction(MF); 455 O << "\n\n"; 456 457 // Print out constants referenced by the function 458 printConstantPool(MF.getConstantPool()); 459 460 // Print out labels for the function. 461 O << "\t.text\n"; 462 emitAlignment(2); 463 O << "\t.globl\t" << CurrentFnName << "\n"; 464 O << CurrentFnName << ":\n"; 465 466 // Print out code for the function. 467 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); 468 I != E; ++I) { 469 // Print a label for the basic block. 470 O << ".LBB" << CurrentFnName << "_" << I->getNumber() << ":\t" 471 << CommentString << " " << I->getBasicBlock()->getName() << "\n"; 472 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); 473 II != E; ++II) { 474 // Print the assembly for the instruction. 475 O << "\t"; 476 printMachineInstruction(II); 477 } 478 } 479 ++LabelNumber; 480 481 // We didn't modify anything. 482 return false; 483} 484 485/// printConstantPool - Print to the current output stream assembly 486/// representations of the constants in the constant pool MCP. This is 487/// used to print out constants which have been "spilled to memory" by 488/// the code generator. 489/// 490void DarwinAsmPrinter::printConstantPool(MachineConstantPool *MCP) { 491 const std::vector<Constant*> &CP = MCP->getConstants(); 492 const TargetData &TD = TM.getTargetData(); 493 494 if (CP.empty()) return; 495 496 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 497 O << "\t.const\n"; 498 emitAlignment(TD.getTypeAlignmentShift(CP[i]->getType())); 499 O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t" << CommentString 500 << *CP[i] << "\n"; 501 emitGlobalConstant(CP[i]); 502 } 503} 504 505bool DarwinAsmPrinter::doFinalization(Module &M) { 506 const TargetData &TD = TM.getTargetData(); 507 std::string CurSection; 508 509 // Print out module-level global variables here. 510 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) 511 if (I->hasInitializer()) { // External global require no code 512 O << '\n'; 513 std::string name = Mang->getValueName(I); 514 Constant *C = I->getInitializer(); 515 unsigned Size = TD.getTypeSize(C->getType()); 516 unsigned Align = TD.getTypeAlignmentShift(C->getType()); 517 518 if (C->isNullValue() && /* FIXME: Verify correct */ 519 (I->hasInternalLinkage() || I->hasWeakLinkage() || 520 I->hasLinkOnceLinkage())) { 521 SwitchSection(O, CurSection, ".data"); 522 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 523 if (I->hasInternalLinkage()) 524 O << ".lcomm " << name << "," << Size << "," << Align; 525 else 526 O << ".comm " << name << "," << Size; 527 O << "\t\t; "; 528 WriteAsOperand(O, I, true, true, &M); 529 O << '\n'; 530 } else { 531 switch (I->getLinkage()) { 532 case GlobalValue::LinkOnceLinkage: 533 O << ".section __TEXT,__textcoal_nt,coalesced,no_toc\n" 534 << ".weak_definition " << name << '\n' 535 << ".private_extern " << name << '\n' 536 << ".section __DATA,__datacoal_nt,coalesced,no_toc\n"; 537 LinkOnceStubs.insert(name); 538 break; 539 case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak. 540 // Nonnull linkonce -> weak 541 O << "\t.weak " << name << "\n"; 542 SwitchSection(O, CurSection, ""); 543 O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n"; 544 break; 545 case GlobalValue::AppendingLinkage: 546 // FIXME: appending linkage variables should go into a section of 547 // their name or something. For now, just emit them as external. 548 case GlobalValue::ExternalLinkage: 549 // If external or appending, declare as a global symbol 550 O << "\t.globl " << name << "\n"; 551 // FALL THROUGH 552 case GlobalValue::InternalLinkage: 553 SwitchSection(O, CurSection, ".data"); 554 break; 555 case GlobalValue::GhostLinkage: 556 std::cerr << "Error: unmaterialized (GhostLinkage) function in asm!"; 557 abort(); 558 } 559 560 emitAlignment(Align); 561 O << name << ":\t\t\t\t; "; 562 WriteAsOperand(O, I, true, true, &M); 563 O << " = "; 564 WriteAsOperand(O, C, false, false, &M); 565 O << "\n"; 566 emitGlobalConstant(C); 567 } 568 } 569 570 // Output stubs for dynamically-linked functions 571 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); 572 i != e; ++i) 573 { 574 O << ".data\n"; 575 O << ".section __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32\n"; 576 emitAlignment(2); 577 O << "L" << *i << "$stub:\n"; 578 O << "\t.indirect_symbol " << *i << "\n"; 579 O << "\tmflr r0\n"; 580 O << "\tbcl 20,31,L0$" << *i << "\n"; 581 O << "L0$" << *i << ":\n"; 582 O << "\tmflr r11\n"; 583 O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n"; 584 O << "\tmtlr r0\n"; 585 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; 586 O << "\tmtctr r12\n"; 587 O << "\tbctr\n"; 588 O << ".data\n"; 589 O << ".lazy_symbol_pointer\n"; 590 O << "L" << *i << "$lazy_ptr:\n"; 591 O << "\t.indirect_symbol " << *i << "\n"; 592 O << "\t.long dyld_stub_binding_helper\n"; 593 } 594 595 O << "\n"; 596 597 // Output stubs for external global variables 598 if (GVStubs.begin() != GVStubs.end()) 599 O << ".data\n.non_lazy_symbol_pointer\n"; 600 for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end(); 601 i != e; ++i) { 602 O << "L" << *i << "$non_lazy_ptr:\n"; 603 O << "\t.indirect_symbol " << *i << "\n"; 604 O << "\t.long\t0\n"; 605 } 606 607 // Output stubs for link-once variables 608 if (LinkOnceStubs.begin() != LinkOnceStubs.end()) 609 O << ".data\n.align 2\n"; 610 for (std::set<std::string>::iterator i = LinkOnceStubs.begin(), 611 e = LinkOnceStubs.end(); i != e; ++i) { 612 O << "L" << *i << "$non_lazy_ptr:\n" 613 << "\t.long\t" << *i << '\n'; 614 } 615 616 AsmPrinter::doFinalization(M); 617 return false; // success 618} 619 620/// runOnMachineFunction - This uses the printMachineInstruction() 621/// method to print assembly for each instruction. 622/// 623bool AIXAsmPrinter::runOnMachineFunction(MachineFunction &MF) { 624 CurrentFnName = MF.getFunction()->getName(); 625 626 // Print out constants referenced by the function 627 printConstantPool(MF.getConstantPool()); 628 629 // Print out header for the function. 630 O << "\t.csect .text[PR]\n" 631 << "\t.align 2\n" 632 << "\t.globl " << CurrentFnName << '\n' 633 << "\t.globl ." << CurrentFnName << '\n' 634 << "\t.csect " << CurrentFnName << "[DS],3\n" 635 << CurrentFnName << ":\n" 636 << "\t.llong ." << CurrentFnName << ", TOC[tc0], 0\n" 637 << "\t.csect .text[PR]\n" 638 << '.' << CurrentFnName << ":\n"; 639 640 // Print out code for the function. 641 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); 642 I != E; ++I) { 643 // Print a label for the basic block. 644 O << "LBB" << CurrentFnName << "_" << I->getNumber() << ":\t# " 645 << I->getBasicBlock()->getName() << "\n"; 646 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); 647 II != E; ++II) { 648 // Print the assembly for the instruction. 649 O << "\t"; 650 printMachineInstruction(II); 651 } 652 } 653 ++LabelNumber; 654 655 O << "LT.." << CurrentFnName << ":\n" 656 << "\t.long 0\n" 657 << "\t.byte 0,0,32,65,128,0,0,0\n" 658 << "\t.long LT.." << CurrentFnName << "-." << CurrentFnName << '\n' 659 << "\t.short 3\n" 660 << "\t.byte \"" << CurrentFnName << "\"\n" 661 << "\t.align 2\n"; 662 663 // We didn't modify anything. 664 return false; 665} 666 667/// printConstantPool - Print to the current output stream assembly 668/// representations of the constants in the constant pool MCP. This is 669/// used to print out constants which have been "spilled to memory" by 670/// the code generator. 671/// 672void AIXAsmPrinter::printConstantPool(MachineConstantPool *MCP) { 673 const std::vector<Constant*> &CP = MCP->getConstants(); 674 const TargetData &TD = TM.getTargetData(); 675 676 if (CP.empty()) return; 677 678 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 679 O << "\t.const\n"; 680 O << "\t.align " << (unsigned)TD.getTypeAlignment(CP[i]->getType()) 681 << "\n"; 682 O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t;" 683 << *CP[i] << "\n"; 684 emitGlobalConstant(CP[i]); 685 } 686} 687 688bool AIXAsmPrinter::doInitialization(Module &M) { 689 const TargetData &TD = TM.getTargetData(); 690 std::string CurSection; 691 692 O << "\t.machine \"ppc64\"\n" 693 << "\t.toc\n" 694 << "\t.csect .text[PR]\n"; 695 696 // Print out module-level global variables 697 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) { 698 if (!I->hasInitializer()) 699 continue; 700 701 std::string Name = I->getName(); 702 Constant *C = I->getInitializer(); 703 // N.B.: We are defaulting to writable strings 704 if (I->hasExternalLinkage()) { 705 O << "\t.globl " << Name << '\n' 706 << "\t.csect .data[RW],3\n"; 707 } else { 708 O << "\t.csect _global.rw_c[RW],3\n"; 709 } 710 O << Name << ":\n"; 711 emitGlobalConstant(C); 712 } 713 714 // Output labels for globals 715 if (M.global_begin() != M.global_end()) O << "\t.toc\n"; 716 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) { 717 const GlobalVariable *GV = I; 718 // Do not output labels for unused variables 719 if (GV->isExternal() && GV->use_begin() == GV->use_end()) 720 continue; 721 722 std::string Name = GV->getName(); 723 std::string Label = "LC.." + utostr(LabelNumber++); 724 GVToLabelMap[GV] = Label; 725 O << Label << ":\n" 726 << "\t.tc " << Name << "[TC]," << Name; 727 if (GV->isExternal()) O << "[RW]"; 728 O << '\n'; 729 } 730 731 Mang = new Mangler(M, "."); 732 return false; // success 733} 734 735bool AIXAsmPrinter::doFinalization(Module &M) { 736 const TargetData &TD = TM.getTargetData(); 737 // Print out module-level global variables 738 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) { 739 if (I->hasInitializer() || I->hasExternalLinkage()) 740 continue; 741 742 std::string Name = I->getName(); 743 if (I->hasInternalLinkage()) { 744 O << "\t.lcomm " << Name << ",16,_global.bss_c"; 745 } else { 746 O << "\t.comm " << Name << "," << TD.getTypeSize(I->getType()) 747 << "," << log2((unsigned)TD.getTypeAlignment(I->getType())); 748 } 749 O << "\t\t# "; 750 WriteAsOperand(O, I, true, true, &M); 751 O << "\n"; 752 } 753 754 O << "_section_.text:\n" 755 << "\t.csect .data[RW],3\n" 756 << "\t.llong _section_.text\n"; 757 758 delete Mang; 759 return false; // success 760} 761