PPCAsmPrinter.cpp revision 27499e3f1beaf21b5afa95c0008649a6cfcadf7a
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 } 141 142 virtual void printConstantPool(MachineConstantPool *MCP) = 0; 143 virtual bool runOnMachineFunction(MachineFunction &F) = 0; 144 virtual bool doFinalization(Module &M) = 0; 145 }; 146 147 /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS 148 /// X 149 /// 150 struct DarwinAsmPrinter : public PowerPCAsmPrinter { 151 152 DarwinAsmPrinter(std::ostream &O, TargetMachine &TM) 153 : PowerPCAsmPrinter(O, TM) { 154 CommentString = ";"; 155 GlobalPrefix = "_"; 156 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros. 157 Data64bitsDirective = 0; // we can't emit a 64-bit unit 158 AlignmentIsInBytes = false; // Alignment is by power of 2. 159 } 160 161 virtual const char *getPassName() const { 162 return "Darwin PPC Assembly Printer"; 163 } 164 165 void printConstantPool(MachineConstantPool *MCP); 166 bool runOnMachineFunction(MachineFunction &F); 167 bool doFinalization(Module &M); 168 }; 169 170 /// AIXAsmPrinter - PowerPC assembly printer, customized for AIX 171 /// 172 struct AIXAsmPrinter : public PowerPCAsmPrinter { 173 /// Map for labels corresponding to global variables 174 /// 175 std::map<const GlobalVariable*,std::string> GVToLabelMap; 176 177 AIXAsmPrinter(std::ostream &O, TargetMachine &TM) 178 : PowerPCAsmPrinter(O, TM) { 179 CommentString = "#"; 180 GlobalPrefix = "_"; 181 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros. 182 Data64bitsDirective = 0; // we can't emit a 64-bit unit 183 AlignmentIsInBytes = false; // Alignment is by power of 2. 184 } 185 186 virtual const char *getPassName() const { 187 return "AIX PPC Assembly Printer"; 188 } 189 190 void printConstantPool(MachineConstantPool *MCP); 191 bool runOnMachineFunction(MachineFunction &F); 192 bool doInitialization(Module &M); 193 bool doFinalization(Module &M); 194 }; 195} // end of anonymous namespace 196 197// SwitchSection - Switch to the specified section of the executable if we are 198// not already in it! 199// 200static void SwitchSection(std::ostream &OS, std::string &CurSection, 201 const char *NewSection) { 202 if (CurSection != NewSection) { 203 CurSection = NewSection; 204 if (!CurSection.empty()) 205 OS << "\t" << NewSection << "\n"; 206 } 207} 208 209/// isStringCompatible - Can we treat the specified array as a string? 210/// Only if it is an array of ubytes or non-negative sbytes. 211/// 212static bool isStringCompatible(const ConstantArray *CVA) { 213 const Type *ETy = cast<ArrayType>(CVA->getType())->getElementType(); 214 if (ETy == Type::UByteTy) return true; 215 if (ETy != Type::SByteTy) return false; 216 217 for (unsigned i = 0; i < CVA->getNumOperands(); ++i) 218 if (cast<ConstantSInt>(CVA->getOperand(i))->getValue() < 0) 219 return false; 220 221 return true; 222} 223 224/// toOctal - Convert the low order bits of X into an octal digit. 225/// 226static inline char toOctal(int X) { 227 return (X&7)+'0'; 228} 229 230// Possible states while outputting ASCII strings 231namespace { 232 enum StringSection { 233 None, 234 Alpha, 235 Numeric 236 }; 237} 238 239/// SwitchStringSection - manage the changes required to output bytes as 240/// characters in a string vs. numeric decimal values 241/// 242static inline void SwitchStringSection(std::ostream &O, StringSection NewSect, 243 StringSection &Current) { 244 if (Current == None) { 245 if (NewSect == Alpha) 246 O << "\t.byte \""; 247 else if (NewSect == Numeric) 248 O << "\t.byte "; 249 } else if (Current == Alpha) { 250 if (NewSect == None) 251 O << "\""; 252 else if (NewSect == Numeric) 253 O << "\"\n" 254 << "\t.byte "; 255 } else if (Current == Numeric) { 256 if (NewSect == Alpha) 257 O << '\n' 258 << "\t.byte \""; 259 else if (NewSect == Numeric) 260 O << ", "; 261 } 262 263 Current = NewSect; 264} 265 266/// getAsCString - Return the specified array as a C compatible 267/// string, only if the predicate isStringCompatible is true. 268/// 269static void printAsCString(std::ostream &O, const ConstantArray *CVA) { 270 assert(isStringCompatible(CVA) && "Array is not string compatible!"); 271 272 if (CVA->getNumOperands() == 0) 273 return; 274 275 StringSection Current = None; 276 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i) { 277 unsigned char C = cast<ConstantInt>(CVA->getOperand(i))->getRawValue(); 278 if (C == '"') { 279 SwitchStringSection(O, Alpha, Current); 280 O << "\"\""; 281 } else if (isprint(C)) { 282 SwitchStringSection(O, Alpha, Current); 283 O << C; 284 } else { 285 SwitchStringSection(O, Numeric, Current); 286 O << utostr((unsigned)C); 287 } 288 } 289 SwitchStringSection(O, None, Current); 290 O << '\n'; 291} 292 293/// createDarwinAsmPrinterPass - Returns a pass that prints the PPC assembly 294/// code for a MachineFunction to the given output stream, in a format that the 295/// Darwin assembler can deal with. 296/// 297FunctionPass *llvm::createDarwinAsmPrinter(std::ostream &o, TargetMachine &tm) { 298 return new DarwinAsmPrinter(o, tm); 299} 300 301/// createAIXAsmPrinterPass - Returns a pass that prints the PPC assembly code 302/// for a MachineFunction to the given output stream, in a format that the 303/// AIX 5L assembler can deal with. 304/// 305FunctionPass *llvm::createAIXAsmPrinter(std::ostream &o, TargetMachine &tm) { 306 return new AIXAsmPrinter(o, tm); 307} 308 309// Include the auto-generated portion of the assembly writer 310#include "PowerPCGenAsmWriter.inc" 311 312void PowerPCAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) { 313 const MRegisterInfo &RI = *TM.getRegisterInfo(); 314 int new_symbol; 315 316 switch (MO.getType()) { 317 case MachineOperand::MO_VirtualRegister: 318 if (Value *V = MO.getVRegValueOrNull()) { 319 O << "<" << V->getName() << ">"; 320 return; 321 } 322 // FALLTHROUGH 323 case MachineOperand::MO_MachineRegister: 324 case MachineOperand::MO_CCRegister: 325 O << LowercaseString(RI.get(MO.getReg()).Name); 326 return; 327 328 case MachineOperand::MO_SignExtendedImmed: 329 case MachineOperand::MO_UnextendedImmed: 330 std::cerr << "printOp() does not handle immediate values\n"; 331 abort(); 332 return; 333 334 case MachineOperand::MO_PCRelativeDisp: 335 std::cerr << "Shouldn't use addPCDisp() when building PPC MachineInstrs"; 336 abort(); 337 return; 338 339 case MachineOperand::MO_MachineBasicBlock: { 340 MachineBasicBlock *MBBOp = MO.getMachineBasicBlock(); 341 O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction()) 342 << "_" << MBBOp->getNumber() << "\t; " 343 << MBBOp->getBasicBlock()->getName(); 344 return; 345 } 346 347 case MachineOperand::MO_ConstantPoolIndex: 348 O << ".CPI" << CurrentFnName << "_" << MO.getConstantPoolIndex(); 349 return; 350 351 case MachineOperand::MO_ExternalSymbol: 352 if (IsCallOp) { 353 std::string Name(GlobalPrefix); Name += MO.getSymbolName(); 354 FnStubs.insert(Name); 355 O << "L" << Name << "$stub"; 356 return; 357 } 358 O << GlobalPrefix << MO.getSymbolName(); 359 return; 360 361 case MachineOperand::MO_GlobalAddress: { 362 GlobalValue *GV = MO.getGlobal(); 363 std::string Name = Mang->getValueName(GV); 364 365 // Dynamically-resolved functions need a stub for the function. Be 366 // wary however not to output $stub for external functions whose addresses 367 // are taken. Those should be emitted as $non_lazy_ptr below. 368 Function *F = dyn_cast<Function>(GV); 369 if (F && IsCallOp && F->isExternal()) { 370 FnStubs.insert(Name); 371 O << "L" << Name << "$stub"; 372 return; 373 } 374 375 // External or weakly linked global variables need non-lazily-resolved stubs 376 if ((GV->isExternal() || GV->hasWeakLinkage() || GV->hasLinkOnceLinkage())){ 377 if (GV->hasLinkOnceLinkage()) 378 LinkOnceStubs.insert(Name); 379 else 380 GVStubs.insert(Name); 381 O << "L" << Name << "$non_lazy_ptr"; 382 return; 383 } 384 385 O << Mang->getValueName(GV); 386 return; 387 } 388 389 default: 390 O << "<unknown operand type: " << MO.getType() << ">"; 391 return; 392 } 393} 394 395/// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to 396/// the current output stream. 397/// 398void PowerPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) { 399 ++EmittedInsts; 400 // Check for slwi/srwi mnemonics. 401 if (MI->getOpcode() == PPC::RLWINM) { 402 bool FoundMnemonic = false; 403 unsigned char SH = MI->getOperand(2).getImmedValue(); 404 unsigned char MB = MI->getOperand(3).getImmedValue(); 405 unsigned char ME = MI->getOperand(4).getImmedValue(); 406 if (SH <= 31 && MB == 0 && ME == (31-SH)) { 407 O << "slwi "; FoundMnemonic = true; 408 } 409 if (SH <= 31 && MB == (32-SH) && ME == 31) { 410 O << "srwi "; FoundMnemonic = true; 411 SH = 32-SH; 412 } 413 if (FoundMnemonic) { 414 printOperand(MI, 0, MVT::i64); 415 O << ", "; 416 printOperand(MI, 1, MVT::i64); 417 O << ", " << (unsigned int)SH << "\n"; 418 return; 419 } 420 } 421 422 if (printInstruction(MI)) 423 return; // Printer was automatically generated 424 425 assert(0 && "Unhandled instruction in asm writer!"); 426 abort(); 427 return; 428} 429 430/// runOnMachineFunction - This uses the printMachineInstruction() 431/// method to print assembly for each instruction. 432/// 433bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) { 434 setupMachineFunction(MF); 435 O << "\n\n"; 436 437 // Print out constants referenced by the function 438 printConstantPool(MF.getConstantPool()); 439 440 // Print out labels for the function. 441 O << "\t.text\n"; 442 emitAlignment(2); 443 O << "\t.globl\t" << CurrentFnName << "\n"; 444 O << CurrentFnName << ":\n"; 445 446 // Print out code for the function. 447 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); 448 I != E; ++I) { 449 // Print a label for the basic block. 450 O << ".LBB" << CurrentFnName << "_" << I->getNumber() << ":\t" 451 << CommentString << " " << I->getBasicBlock()->getName() << "\n"; 452 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); 453 II != E; ++II) { 454 // Print the assembly for the instruction. 455 O << "\t"; 456 printMachineInstruction(II); 457 } 458 } 459 ++LabelNumber; 460 461 // We didn't modify anything. 462 return false; 463} 464 465/// printConstantPool - Print to the current output stream assembly 466/// representations of the constants in the constant pool MCP. This is 467/// used to print out constants which have been "spilled to memory" by 468/// the code generator. 469/// 470void DarwinAsmPrinter::printConstantPool(MachineConstantPool *MCP) { 471 const std::vector<Constant*> &CP = MCP->getConstants(); 472 const TargetData &TD = TM.getTargetData(); 473 474 if (CP.empty()) return; 475 476 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 477 O << "\t.const\n"; 478 emitAlignment(TD.getTypeAlignmentShift(CP[i]->getType())); 479 O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t" << CommentString 480 << *CP[i] << "\n"; 481 emitGlobalConstant(CP[i]); 482 } 483} 484 485bool DarwinAsmPrinter::doFinalization(Module &M) { 486 const TargetData &TD = TM.getTargetData(); 487 std::string CurSection; 488 489 // Print out module-level global variables here. 490 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) 491 if (I->hasInitializer()) { // External global require no code 492 O << '\n'; 493 std::string name = Mang->getValueName(I); 494 Constant *C = I->getInitializer(); 495 unsigned Size = TD.getTypeSize(C->getType()); 496 unsigned Align = TD.getTypeAlignmentShift(C->getType()); 497 498 if (C->isNullValue() && /* FIXME: Verify correct */ 499 (I->hasInternalLinkage() || I->hasWeakLinkage() || 500 I->hasLinkOnceLinkage())) { 501 SwitchSection(O, CurSection, ".data"); 502 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. 503 if (I->hasInternalLinkage()) 504 O << ".lcomm " << name << "," << Size << "," << Align; 505 else 506 O << ".comm " << name << "," << Size; 507 O << "\t\t; "; 508 WriteAsOperand(O, I, true, true, &M); 509 O << '\n'; 510 } else { 511 switch (I->getLinkage()) { 512 case GlobalValue::LinkOnceLinkage: 513 O << ".section __TEXT,__textcoal_nt,coalesced,no_toc\n" 514 << ".weak_definition " << name << '\n' 515 << ".private_extern " << name << '\n' 516 << ".section __DATA,__datacoal_nt,coalesced,no_toc\n"; 517 LinkOnceStubs.insert(name); 518 break; 519 case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak. 520 // Nonnull linkonce -> weak 521 O << "\t.weak " << name << "\n"; 522 SwitchSection(O, CurSection, ""); 523 O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n"; 524 break; 525 case GlobalValue::AppendingLinkage: 526 // FIXME: appending linkage variables should go into a section of 527 // their name or something. For now, just emit them as external. 528 case GlobalValue::ExternalLinkage: 529 // If external or appending, declare as a global symbol 530 O << "\t.globl " << name << "\n"; 531 // FALL THROUGH 532 case GlobalValue::InternalLinkage: 533 SwitchSection(O, CurSection, ".data"); 534 break; 535 case GlobalValue::GhostLinkage: 536 std::cerr << "Error: unmaterialized (GhostLinkage) function in asm!"; 537 abort(); 538 } 539 540 emitAlignment(Align); 541 O << name << ":\t\t\t\t; "; 542 WriteAsOperand(O, I, true, true, &M); 543 O << " = "; 544 WriteAsOperand(O, C, false, false, &M); 545 O << "\n"; 546 emitGlobalConstant(C); 547 } 548 } 549 550 // Output stubs for dynamically-linked functions 551 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); 552 i != e; ++i) 553 { 554 O << ".data\n"; 555 O << ".section __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32\n"; 556 emitAlignment(2); 557 O << "L" << *i << "$stub:\n"; 558 O << "\t.indirect_symbol " << *i << "\n"; 559 O << "\tmflr r0\n"; 560 O << "\tbcl 20,31,L0$" << *i << "\n"; 561 O << "L0$" << *i << ":\n"; 562 O << "\tmflr r11\n"; 563 O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n"; 564 O << "\tmtlr r0\n"; 565 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n"; 566 O << "\tmtctr r12\n"; 567 O << "\tbctr\n"; 568 O << ".data\n"; 569 O << ".lazy_symbol_pointer\n"; 570 O << "L" << *i << "$lazy_ptr:\n"; 571 O << "\t.indirect_symbol " << *i << "\n"; 572 O << "\t.long dyld_stub_binding_helper\n"; 573 } 574 575 O << "\n"; 576 577 // Output stubs for external global variables 578 if (GVStubs.begin() != GVStubs.end()) 579 O << ".data\n.non_lazy_symbol_pointer\n"; 580 for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end(); 581 i != e; ++i) { 582 O << "L" << *i << "$non_lazy_ptr:\n"; 583 O << "\t.indirect_symbol " << *i << "\n"; 584 O << "\t.long\t0\n"; 585 } 586 587 // Output stubs for link-once variables 588 if (LinkOnceStubs.begin() != LinkOnceStubs.end()) 589 O << ".data\n.align 2\n"; 590 for (std::set<std::string>::iterator i = LinkOnceStubs.begin(), 591 e = LinkOnceStubs.end(); i != e; ++i) { 592 O << "L" << *i << "$non_lazy_ptr:\n" 593 << "\t.long\t" << *i << '\n'; 594 } 595 596 AsmPrinter::doFinalization(M); 597 return false; // success 598} 599 600/// runOnMachineFunction - This uses the printMachineInstruction() 601/// method to print assembly for each instruction. 602/// 603bool AIXAsmPrinter::runOnMachineFunction(MachineFunction &MF) { 604 CurrentFnName = MF.getFunction()->getName(); 605 606 // Print out constants referenced by the function 607 printConstantPool(MF.getConstantPool()); 608 609 // Print out header for the function. 610 O << "\t.csect .text[PR]\n" 611 << "\t.align 2\n" 612 << "\t.globl " << CurrentFnName << '\n' 613 << "\t.globl ." << CurrentFnName << '\n' 614 << "\t.csect " << CurrentFnName << "[DS],3\n" 615 << CurrentFnName << ":\n" 616 << "\t.llong ." << CurrentFnName << ", TOC[tc0], 0\n" 617 << "\t.csect .text[PR]\n" 618 << '.' << CurrentFnName << ":\n"; 619 620 // Print out code for the function. 621 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); 622 I != E; ++I) { 623 // Print a label for the basic block. 624 O << "LBB" << CurrentFnName << "_" << I->getNumber() << ":\t# " 625 << I->getBasicBlock()->getName() << "\n"; 626 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); 627 II != E; ++II) { 628 // Print the assembly for the instruction. 629 O << "\t"; 630 printMachineInstruction(II); 631 } 632 } 633 ++LabelNumber; 634 635 O << "LT.." << CurrentFnName << ":\n" 636 << "\t.long 0\n" 637 << "\t.byte 0,0,32,65,128,0,0,0\n" 638 << "\t.long LT.." << CurrentFnName << "-." << CurrentFnName << '\n' 639 << "\t.short 3\n" 640 << "\t.byte \"" << CurrentFnName << "\"\n" 641 << "\t.align 2\n"; 642 643 // We didn't modify anything. 644 return false; 645} 646 647/// printConstantPool - Print to the current output stream assembly 648/// representations of the constants in the constant pool MCP. This is 649/// used to print out constants which have been "spilled to memory" by 650/// the code generator. 651/// 652void AIXAsmPrinter::printConstantPool(MachineConstantPool *MCP) { 653 const std::vector<Constant*> &CP = MCP->getConstants(); 654 const TargetData &TD = TM.getTargetData(); 655 656 if (CP.empty()) return; 657 658 for (unsigned i = 0, e = CP.size(); i != e; ++i) { 659 O << "\t.const\n"; 660 O << "\t.align " << (unsigned)TD.getTypeAlignment(CP[i]->getType()) 661 << "\n"; 662 O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t;" 663 << *CP[i] << "\n"; 664 emitGlobalConstant(CP[i]); 665 } 666} 667 668bool AIXAsmPrinter::doInitialization(Module &M) { 669 const TargetData &TD = TM.getTargetData(); 670 std::string CurSection; 671 672 O << "\t.machine \"ppc64\"\n" 673 << "\t.toc\n" 674 << "\t.csect .text[PR]\n"; 675 676 // Print out module-level global variables 677 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) { 678 if (!I->hasInitializer()) 679 continue; 680 681 std::string Name = I->getName(); 682 Constant *C = I->getInitializer(); 683 // N.B.: We are defaulting to writable strings 684 if (I->hasExternalLinkage()) { 685 O << "\t.globl " << Name << '\n' 686 << "\t.csect .data[RW],3\n"; 687 } else { 688 O << "\t.csect _global.rw_c[RW],3\n"; 689 } 690 O << Name << ":\n"; 691 emitGlobalConstant(C); 692 } 693 694 // Output labels for globals 695 if (M.global_begin() != M.global_end()) O << "\t.toc\n"; 696 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) { 697 const GlobalVariable *GV = I; 698 // Do not output labels for unused variables 699 if (GV->isExternal() && GV->use_begin() == GV->use_end()) 700 continue; 701 702 std::string Name = GV->getName(); 703 std::string Label = "LC.." + utostr(LabelNumber++); 704 GVToLabelMap[GV] = Label; 705 O << Label << ":\n" 706 << "\t.tc " << Name << "[TC]," << Name; 707 if (GV->isExternal()) O << "[RW]"; 708 O << '\n'; 709 } 710 711 Mang = new Mangler(M, "."); 712 return false; // success 713} 714 715bool AIXAsmPrinter::doFinalization(Module &M) { 716 const TargetData &TD = TM.getTargetData(); 717 // Print out module-level global variables 718 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) { 719 if (I->hasInitializer() || I->hasExternalLinkage()) 720 continue; 721 722 std::string Name = I->getName(); 723 if (I->hasInternalLinkage()) { 724 O << "\t.lcomm " << Name << ",16,_global.bss_c"; 725 } else { 726 O << "\t.comm " << Name << "," << TD.getTypeSize(I->getType()) 727 << "," << log2((unsigned)TD.getTypeAlignment(I->getType())); 728 } 729 O << "\t\t# "; 730 WriteAsOperand(O, I, true, true, &M); 731 O << "\n"; 732 } 733 734 O << "_section_.text:\n" 735 << "\t.csect .data[RW],3\n" 736 << "\t.llong _section_.text\n"; 737 738 delete Mang; 739 return false; // success 740} 741