MachineFunction.cpp revision e2f669fb3fa7a6bee4196999b119a98f31c072a3
1//===-- MachineFunction.cpp -----------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// Collect native machine code information for a function. This allows 11// target-specific information about the generated code to be stored with each 12// function. 13// 14//===----------------------------------------------------------------------===// 15 16#include "llvm/DerivedTypes.h" 17#include "llvm/Function.h" 18#include "llvm/Instructions.h" 19#include "llvm/Config/config.h" 20#include "llvm/CodeGen/MachineConstantPool.h" 21#include "llvm/CodeGen/MachineFunction.h" 22#include "llvm/CodeGen/MachineFunctionPass.h" 23#include "llvm/CodeGen/MachineFrameInfo.h" 24#include "llvm/CodeGen/MachineInstr.h" 25#include "llvm/CodeGen/MachineJumpTableInfo.h" 26#include "llvm/CodeGen/MachineModuleInfo.h" 27#include "llvm/CodeGen/MachineRegisterInfo.h" 28#include "llvm/CodeGen/Passes.h" 29#include "llvm/MC/MCAsmInfo.h" 30#include "llvm/MC/MCContext.h" 31#include "llvm/Analysis/DebugInfo.h" 32#include "llvm/Support/Debug.h" 33#include "llvm/Target/TargetData.h" 34#include "llvm/Target/TargetLowering.h" 35#include "llvm/Target/TargetMachine.h" 36#include "llvm/Target/TargetFrameLowering.h" 37#include "llvm/ADT/SmallString.h" 38#include "llvm/ADT/STLExtras.h" 39#include "llvm/Support/GraphWriter.h" 40#include "llvm/Support/raw_ostream.h" 41using namespace llvm; 42 43//===----------------------------------------------------------------------===// 44// MachineFunction implementation 45//===----------------------------------------------------------------------===// 46 47// Out of line virtual method. 48MachineFunctionInfo::~MachineFunctionInfo() {} 49 50void ilist_traits<MachineBasicBlock>::deleteNode(MachineBasicBlock *MBB) { 51 MBB->getParent()->DeleteMachineBasicBlock(MBB); 52} 53 54MachineFunction::MachineFunction(const Function *F, const TargetMachine &TM, 55 unsigned FunctionNum, MachineModuleInfo &mmi, 56 GCModuleInfo* gmi) 57 : Fn(F), Target(TM), Ctx(mmi.getContext()), MMI(mmi), GMI(gmi) { 58 if (TM.getRegisterInfo()) 59 RegInfo = new (Allocator) MachineRegisterInfo(*TM.getRegisterInfo()); 60 else 61 RegInfo = 0; 62 MFInfo = 0; 63 FrameInfo = new (Allocator) MachineFrameInfo(*TM.getFrameLowering()); 64 if (Fn->hasFnAttr(Attribute::StackAlignment)) 65 FrameInfo->setMaxAlignment(Attribute::getStackAlignmentFromAttrs( 66 Fn->getAttributes().getFnAttributes())); 67 ConstantPool = new (Allocator) MachineConstantPool(TM.getTargetData()); 68 Alignment = TM.getTargetLowering()->getFunctionAlignment(F); 69 FunctionNumber = FunctionNum; 70 JumpTableInfo = 0; 71} 72 73MachineFunction::~MachineFunction() { 74 BasicBlocks.clear(); 75 InstructionRecycler.clear(Allocator); 76 BasicBlockRecycler.clear(Allocator); 77 if (RegInfo) { 78 RegInfo->~MachineRegisterInfo(); 79 Allocator.Deallocate(RegInfo); 80 } 81 if (MFInfo) { 82 MFInfo->~MachineFunctionInfo(); 83 Allocator.Deallocate(MFInfo); 84 } 85 FrameInfo->~MachineFrameInfo(); Allocator.Deallocate(FrameInfo); 86 ConstantPool->~MachineConstantPool(); Allocator.Deallocate(ConstantPool); 87 88 if (JumpTableInfo) { 89 JumpTableInfo->~MachineJumpTableInfo(); 90 Allocator.Deallocate(JumpTableInfo); 91 } 92} 93 94/// getOrCreateJumpTableInfo - Get the JumpTableInfo for this function, if it 95/// does already exist, allocate one. 96MachineJumpTableInfo *MachineFunction:: 97getOrCreateJumpTableInfo(unsigned EntryKind) { 98 if (JumpTableInfo) return JumpTableInfo; 99 100 JumpTableInfo = new (Allocator) 101 MachineJumpTableInfo((MachineJumpTableInfo::JTEntryKind)EntryKind); 102 return JumpTableInfo; 103} 104 105/// RenumberBlocks - This discards all of the MachineBasicBlock numbers and 106/// recomputes them. This guarantees that the MBB numbers are sequential, 107/// dense, and match the ordering of the blocks within the function. If a 108/// specific MachineBasicBlock is specified, only that block and those after 109/// it are renumbered. 110void MachineFunction::RenumberBlocks(MachineBasicBlock *MBB) { 111 if (empty()) { MBBNumbering.clear(); return; } 112 MachineFunction::iterator MBBI, E = end(); 113 if (MBB == 0) 114 MBBI = begin(); 115 else 116 MBBI = MBB; 117 118 // Figure out the block number this should have. 119 unsigned BlockNo = 0; 120 if (MBBI != begin()) 121 BlockNo = prior(MBBI)->getNumber()+1; 122 123 for (; MBBI != E; ++MBBI, ++BlockNo) { 124 if (MBBI->getNumber() != (int)BlockNo) { 125 // Remove use of the old number. 126 if (MBBI->getNumber() != -1) { 127 assert(MBBNumbering[MBBI->getNumber()] == &*MBBI && 128 "MBB number mismatch!"); 129 MBBNumbering[MBBI->getNumber()] = 0; 130 } 131 132 // If BlockNo is already taken, set that block's number to -1. 133 if (MBBNumbering[BlockNo]) 134 MBBNumbering[BlockNo]->setNumber(-1); 135 136 MBBNumbering[BlockNo] = MBBI; 137 MBBI->setNumber(BlockNo); 138 } 139 } 140 141 // Okay, all the blocks are renumbered. If we have compactified the block 142 // numbering, shrink MBBNumbering now. 143 assert(BlockNo <= MBBNumbering.size() && "Mismatch!"); 144 MBBNumbering.resize(BlockNo); 145} 146 147/// CreateMachineInstr - Allocate a new MachineInstr. Use this instead 148/// of `new MachineInstr'. 149/// 150MachineInstr * 151MachineFunction::CreateMachineInstr(const TargetInstrDesc &TID, 152 DebugLoc DL, bool NoImp) { 153 return new (InstructionRecycler.Allocate<MachineInstr>(Allocator)) 154 MachineInstr(TID, DL, NoImp); 155} 156 157/// CloneMachineInstr - Create a new MachineInstr which is a copy of the 158/// 'Orig' instruction, identical in all ways except the instruction 159/// has no parent, prev, or next. 160/// 161MachineInstr * 162MachineFunction::CloneMachineInstr(const MachineInstr *Orig) { 163 return new (InstructionRecycler.Allocate<MachineInstr>(Allocator)) 164 MachineInstr(*this, *Orig); 165} 166 167/// DeleteMachineInstr - Delete the given MachineInstr. 168/// 169void 170MachineFunction::DeleteMachineInstr(MachineInstr *MI) { 171 MI->~MachineInstr(); 172 InstructionRecycler.Deallocate(Allocator, MI); 173} 174 175/// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this 176/// instead of `new MachineBasicBlock'. 177/// 178MachineBasicBlock * 179MachineFunction::CreateMachineBasicBlock(const BasicBlock *bb) { 180 return new (BasicBlockRecycler.Allocate<MachineBasicBlock>(Allocator)) 181 MachineBasicBlock(*this, bb); 182} 183 184/// DeleteMachineBasicBlock - Delete the given MachineBasicBlock. 185/// 186void 187MachineFunction::DeleteMachineBasicBlock(MachineBasicBlock *MBB) { 188 assert(MBB->getParent() == this && "MBB parent mismatch!"); 189 MBB->~MachineBasicBlock(); 190 BasicBlockRecycler.Deallocate(Allocator, MBB); 191} 192 193MachineMemOperand * 194MachineFunction::getMachineMemOperand(MachinePointerInfo PtrInfo, unsigned f, 195 uint64_t s, unsigned base_alignment, 196 const MDNode *TBAAInfo) { 197 return new (Allocator) MachineMemOperand(PtrInfo, f, s, base_alignment, 198 TBAAInfo); 199} 200 201MachineMemOperand * 202MachineFunction::getMachineMemOperand(const MachineMemOperand *MMO, 203 int64_t Offset, uint64_t Size) { 204 return new (Allocator) 205 MachineMemOperand(MachinePointerInfo(MMO->getValue(), 206 MMO->getOffset()+Offset), 207 MMO->getFlags(), Size, 208 MMO->getBaseAlignment(), 0); 209} 210 211MachineInstr::mmo_iterator 212MachineFunction::allocateMemRefsArray(unsigned long Num) { 213 return Allocator.Allocate<MachineMemOperand *>(Num); 214} 215 216std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator> 217MachineFunction::extractLoadMemRefs(MachineInstr::mmo_iterator Begin, 218 MachineInstr::mmo_iterator End) { 219 // Count the number of load mem refs. 220 unsigned Num = 0; 221 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) 222 if ((*I)->isLoad()) 223 ++Num; 224 225 // Allocate a new array and populate it with the load information. 226 MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num); 227 unsigned Index = 0; 228 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) { 229 if ((*I)->isLoad()) { 230 if (!(*I)->isStore()) 231 // Reuse the MMO. 232 Result[Index] = *I; 233 else { 234 // Clone the MMO and unset the store flag. 235 MachineMemOperand *JustLoad = 236 getMachineMemOperand((*I)->getPointerInfo(), 237 (*I)->getFlags() & ~MachineMemOperand::MOStore, 238 (*I)->getSize(), (*I)->getBaseAlignment(), 239 (*I)->getTBAAInfo()); 240 Result[Index] = JustLoad; 241 } 242 ++Index; 243 } 244 } 245 return std::make_pair(Result, Result + Num); 246} 247 248std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator> 249MachineFunction::extractStoreMemRefs(MachineInstr::mmo_iterator Begin, 250 MachineInstr::mmo_iterator End) { 251 // Count the number of load mem refs. 252 unsigned Num = 0; 253 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) 254 if ((*I)->isStore()) 255 ++Num; 256 257 // Allocate a new array and populate it with the store information. 258 MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num); 259 unsigned Index = 0; 260 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) { 261 if ((*I)->isStore()) { 262 if (!(*I)->isLoad()) 263 // Reuse the MMO. 264 Result[Index] = *I; 265 else { 266 // Clone the MMO and unset the load flag. 267 MachineMemOperand *JustStore = 268 getMachineMemOperand((*I)->getPointerInfo(), 269 (*I)->getFlags() & ~MachineMemOperand::MOLoad, 270 (*I)->getSize(), (*I)->getBaseAlignment(), 271 (*I)->getTBAAInfo()); 272 Result[Index] = JustStore; 273 } 274 ++Index; 275 } 276 } 277 return std::make_pair(Result, Result + Num); 278} 279 280void MachineFunction::dump() const { 281 print(dbgs()); 282} 283 284void MachineFunction::print(raw_ostream &OS, SlotIndexes *Indexes) const { 285 OS << "# Machine code for function " << Fn->getName() << ":\n"; 286 287 // Print Frame Information 288 FrameInfo->print(*this, OS); 289 290 // Print JumpTable Information 291 if (JumpTableInfo) 292 JumpTableInfo->print(OS); 293 294 // Print Constant Pool 295 ConstantPool->print(OS); 296 297 const TargetRegisterInfo *TRI = getTarget().getRegisterInfo(); 298 299 if (RegInfo && !RegInfo->livein_empty()) { 300 OS << "Function Live Ins: "; 301 for (MachineRegisterInfo::livein_iterator 302 I = RegInfo->livein_begin(), E = RegInfo->livein_end(); I != E; ++I) { 303 OS << PrintReg(I->first, TRI); 304 if (I->second) 305 OS << " in " << PrintReg(I->second, TRI); 306 if (llvm::next(I) != E) 307 OS << ", "; 308 } 309 OS << '\n'; 310 } 311 if (RegInfo && !RegInfo->liveout_empty()) { 312 OS << "Function Live Outs:"; 313 for (MachineRegisterInfo::liveout_iterator 314 I = RegInfo->liveout_begin(), E = RegInfo->liveout_end(); I != E; ++I) 315 OS << ' ' << PrintReg(*I, TRI); 316 OS << '\n'; 317 } 318 319 for (const_iterator BB = begin(), E = end(); BB != E; ++BB) { 320 OS << '\n'; 321 BB->print(OS, Indexes); 322 } 323 324 OS << "\n# End machine code for function " << Fn->getName() << ".\n\n"; 325} 326 327namespace llvm { 328 template<> 329 struct DOTGraphTraits<const MachineFunction*> : public DefaultDOTGraphTraits { 330 331 DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {} 332 333 static std::string getGraphName(const MachineFunction *F) { 334 return "CFG for '" + F->getFunction()->getNameStr() + "' function"; 335 } 336 337 std::string getNodeLabel(const MachineBasicBlock *Node, 338 const MachineFunction *Graph) { 339 std::string OutStr; 340 { 341 raw_string_ostream OSS(OutStr); 342 343 if (isSimple()) { 344 OSS << "BB#" << Node->getNumber(); 345 if (const BasicBlock *BB = Node->getBasicBlock()) 346 OSS << ": " << BB->getName(); 347 } else 348 Node->print(OSS); 349 } 350 351 if (OutStr[0] == '\n') OutStr.erase(OutStr.begin()); 352 353 // Process string output to make it nicer... 354 for (unsigned i = 0; i != OutStr.length(); ++i) 355 if (OutStr[i] == '\n') { // Left justify 356 OutStr[i] = '\\'; 357 OutStr.insert(OutStr.begin()+i+1, 'l'); 358 } 359 return OutStr; 360 } 361 }; 362} 363 364void MachineFunction::viewCFG() const 365{ 366#ifndef NDEBUG 367 ViewGraph(this, "mf" + getFunction()->getNameStr()); 368#else 369 errs() << "MachineFunction::viewCFG is only available in debug builds on " 370 << "systems with Graphviz or gv!\n"; 371#endif // NDEBUG 372} 373 374void MachineFunction::viewCFGOnly() const 375{ 376#ifndef NDEBUG 377 ViewGraph(this, "mf" + getFunction()->getNameStr(), true); 378#else 379 errs() << "MachineFunction::viewCFGOnly is only available in debug builds on " 380 << "systems with Graphviz or gv!\n"; 381#endif // NDEBUG 382} 383 384/// addLiveIn - Add the specified physical register as a live-in value and 385/// create a corresponding virtual register for it. 386unsigned MachineFunction::addLiveIn(unsigned PReg, 387 const TargetRegisterClass *RC) { 388 MachineRegisterInfo &MRI = getRegInfo(); 389 unsigned VReg = MRI.getLiveInVirtReg(PReg); 390 if (VReg) { 391 assert(MRI.getRegClass(VReg) == RC && "Register class mismatch!"); 392 return VReg; 393 } 394 VReg = MRI.createVirtualRegister(RC); 395 MRI.addLiveIn(PReg, VReg); 396 return VReg; 397} 398 399/// getJTISymbol - Return the MCSymbol for the specified non-empty jump table. 400/// If isLinkerPrivate is specified, an 'l' label is returned, otherwise a 401/// normal 'L' label is returned. 402MCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx, 403 bool isLinkerPrivate) const { 404 assert(JumpTableInfo && "No jump tables"); 405 406 assert(JTI < JumpTableInfo->getJumpTables().size() && "Invalid JTI!"); 407 const MCAsmInfo &MAI = *getTarget().getMCAsmInfo(); 408 409 const char *Prefix = isLinkerPrivate ? MAI.getLinkerPrivateGlobalPrefix() : 410 MAI.getPrivateGlobalPrefix(); 411 SmallString<60> Name; 412 raw_svector_ostream(Name) 413 << Prefix << "JTI" << getFunctionNumber() << '_' << JTI; 414 return Ctx.GetOrCreateSymbol(Name.str()); 415} 416 417/// getPICBaseSymbol - Return a function-local symbol to represent the PIC 418/// base. 419MCSymbol *MachineFunction::getPICBaseSymbol() const { 420 const MCAsmInfo &MAI = *Target.getMCAsmInfo(); 421 return Ctx.GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix())+ 422 Twine(getFunctionNumber())+"$pb"); 423} 424 425//===----------------------------------------------------------------------===// 426// MachineFrameInfo implementation 427//===----------------------------------------------------------------------===// 428 429/// CreateFixedObject - Create a new object at a fixed location on the stack. 430/// All fixed objects should be created before other objects are created for 431/// efficiency. By default, fixed objects are immutable. This returns an 432/// index with a negative value. 433/// 434int MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset, 435 bool Immutable) { 436 assert(Size != 0 && "Cannot allocate zero size fixed stack objects!"); 437 // The alignment of the frame index can be determined from its offset from 438 // the incoming frame position. If the frame object is at offset 32 and 439 // the stack is guaranteed to be 16-byte aligned, then we know that the 440 // object is 16-byte aligned. 441 unsigned StackAlign = TFI.getStackAlignment(); 442 unsigned Align = MinAlign(SPOffset, StackAlign); 443 Objects.insert(Objects.begin(), StackObject(Size, Align, SPOffset, Immutable, 444 /*isSS*/false, false)); 445 return -++NumFixedObjects; 446} 447 448 449BitVector 450MachineFrameInfo::getPristineRegs(const MachineBasicBlock *MBB) const { 451 assert(MBB && "MBB must be valid"); 452 const MachineFunction *MF = MBB->getParent(); 453 assert(MF && "MBB must be part of a MachineFunction"); 454 const TargetMachine &TM = MF->getTarget(); 455 const TargetRegisterInfo *TRI = TM.getRegisterInfo(); 456 BitVector BV(TRI->getNumRegs()); 457 458 // Before CSI is calculated, no registers are considered pristine. They can be 459 // freely used and PEI will make sure they are saved. 460 if (!isCalleeSavedInfoValid()) 461 return BV; 462 463 for (const unsigned *CSR = TRI->getCalleeSavedRegs(MF); CSR && *CSR; ++CSR) 464 BV.set(*CSR); 465 466 // The entry MBB always has all CSRs pristine. 467 if (MBB == &MF->front()) 468 return BV; 469 470 // On other MBBs the saved CSRs are not pristine. 471 const std::vector<CalleeSavedInfo> &CSI = getCalleeSavedInfo(); 472 for (std::vector<CalleeSavedInfo>::const_iterator I = CSI.begin(), 473 E = CSI.end(); I != E; ++I) 474 BV.reset(I->getReg()); 475 476 return BV; 477} 478 479 480void MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{ 481 if (Objects.empty()) return; 482 483 const TargetFrameLowering *FI = MF.getTarget().getFrameLowering(); 484 int ValOffset = (FI ? FI->getOffsetOfLocalArea() : 0); 485 486 OS << "Frame Objects:\n"; 487 488 for (unsigned i = 0, e = Objects.size(); i != e; ++i) { 489 const StackObject &SO = Objects[i]; 490 OS << " fi#" << (int)(i-NumFixedObjects) << ": "; 491 if (SO.Size == ~0ULL) { 492 OS << "dead\n"; 493 continue; 494 } 495 if (SO.Size == 0) 496 OS << "variable sized"; 497 else 498 OS << "size=" << SO.Size; 499 OS << ", align=" << SO.Alignment; 500 501 if (i < NumFixedObjects) 502 OS << ", fixed"; 503 if (i < NumFixedObjects || SO.SPOffset != -1) { 504 int64_t Off = SO.SPOffset - ValOffset; 505 OS << ", at location [SP"; 506 if (Off > 0) 507 OS << "+" << Off; 508 else if (Off < 0) 509 OS << Off; 510 OS << "]"; 511 } 512 OS << "\n"; 513 } 514} 515 516void MachineFrameInfo::dump(const MachineFunction &MF) const { 517 print(MF, dbgs()); 518} 519 520//===----------------------------------------------------------------------===// 521// MachineJumpTableInfo implementation 522//===----------------------------------------------------------------------===// 523 524/// getEntrySize - Return the size of each entry in the jump table. 525unsigned MachineJumpTableInfo::getEntrySize(const TargetData &TD) const { 526 // The size of a jump table entry is 4 bytes unless the entry is just the 527 // address of a block, in which case it is the pointer size. 528 switch (getEntryKind()) { 529 case MachineJumpTableInfo::EK_BlockAddress: 530 return TD.getPointerSize(); 531 case MachineJumpTableInfo::EK_GPRel32BlockAddress: 532 case MachineJumpTableInfo::EK_LabelDifference32: 533 case MachineJumpTableInfo::EK_Custom32: 534 return 4; 535 case MachineJumpTableInfo::EK_Inline: 536 return 0; 537 } 538 assert(0 && "Unknown jump table encoding!"); 539 return ~0; 540} 541 542/// getEntryAlignment - Return the alignment of each entry in the jump table. 543unsigned MachineJumpTableInfo::getEntryAlignment(const TargetData &TD) const { 544 // The alignment of a jump table entry is the alignment of int32 unless the 545 // entry is just the address of a block, in which case it is the pointer 546 // alignment. 547 switch (getEntryKind()) { 548 case MachineJumpTableInfo::EK_BlockAddress: 549 return TD.getPointerABIAlignment(); 550 case MachineJumpTableInfo::EK_GPRel32BlockAddress: 551 case MachineJumpTableInfo::EK_LabelDifference32: 552 case MachineJumpTableInfo::EK_Custom32: 553 return TD.getABIIntegerTypeAlignment(32); 554 case MachineJumpTableInfo::EK_Inline: 555 return 1; 556 } 557 assert(0 && "Unknown jump table encoding!"); 558 return ~0; 559} 560 561/// createJumpTableIndex - Create a new jump table entry in the jump table info. 562/// 563unsigned MachineJumpTableInfo::createJumpTableIndex( 564 const std::vector<MachineBasicBlock*> &DestBBs) { 565 assert(!DestBBs.empty() && "Cannot create an empty jump table!"); 566 JumpTables.push_back(MachineJumpTableEntry(DestBBs)); 567 return JumpTables.size()-1; 568} 569 570/// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update 571/// the jump tables to branch to New instead. 572bool MachineJumpTableInfo::ReplaceMBBInJumpTables(MachineBasicBlock *Old, 573 MachineBasicBlock *New) { 574 assert(Old != New && "Not making a change?"); 575 bool MadeChange = false; 576 for (size_t i = 0, e = JumpTables.size(); i != e; ++i) 577 ReplaceMBBInJumpTable(i, Old, New); 578 return MadeChange; 579} 580 581/// ReplaceMBBInJumpTable - If Old is a target of the jump tables, update 582/// the jump table to branch to New instead. 583bool MachineJumpTableInfo::ReplaceMBBInJumpTable(unsigned Idx, 584 MachineBasicBlock *Old, 585 MachineBasicBlock *New) { 586 assert(Old != New && "Not making a change?"); 587 bool MadeChange = false; 588 MachineJumpTableEntry &JTE = JumpTables[Idx]; 589 for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j) 590 if (JTE.MBBs[j] == Old) { 591 JTE.MBBs[j] = New; 592 MadeChange = true; 593 } 594 return MadeChange; 595} 596 597void MachineJumpTableInfo::print(raw_ostream &OS) const { 598 if (JumpTables.empty()) return; 599 600 OS << "Jump Tables:\n"; 601 602 for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) { 603 OS << " jt#" << i << ": "; 604 for (unsigned j = 0, f = JumpTables[i].MBBs.size(); j != f; ++j) 605 OS << " BB#" << JumpTables[i].MBBs[j]->getNumber(); 606 } 607 608 OS << '\n'; 609} 610 611void MachineJumpTableInfo::dump() const { print(dbgs()); } 612 613 614//===----------------------------------------------------------------------===// 615// MachineConstantPool implementation 616//===----------------------------------------------------------------------===// 617 618const Type *MachineConstantPoolEntry::getType() const { 619 if (isMachineConstantPoolEntry()) 620 return Val.MachineCPVal->getType(); 621 return Val.ConstVal->getType(); 622} 623 624 625unsigned MachineConstantPoolEntry::getRelocationInfo() const { 626 if (isMachineConstantPoolEntry()) 627 return Val.MachineCPVal->getRelocationInfo(); 628 return Val.ConstVal->getRelocationInfo(); 629} 630 631MachineConstantPool::~MachineConstantPool() { 632 for (unsigned i = 0, e = Constants.size(); i != e; ++i) 633 if (Constants[i].isMachineConstantPoolEntry()) 634 delete Constants[i].Val.MachineCPVal; 635 for (DenseSet<MachineConstantPoolValue*>::iterator I = 636 MachineCPVsSharingEntries.begin(), E = MachineCPVsSharingEntries.end(); 637 I != E; ++I) 638 delete *I; 639} 640 641/// CanShareConstantPoolEntry - Test whether the given two constants 642/// can be allocated the same constant pool entry. 643static bool CanShareConstantPoolEntry(const Constant *A, const Constant *B, 644 const TargetData *TD) { 645 // Handle the trivial case quickly. 646 if (A == B) return true; 647 648 // If they have the same type but weren't the same constant, quickly 649 // reject them. 650 if (A->getType() == B->getType()) return false; 651 652 // For now, only support constants with the same size. 653 if (TD->getTypeStoreSize(A->getType()) != TD->getTypeStoreSize(B->getType())) 654 return false; 655 656 // If a floating-point value and an integer value have the same encoding, 657 // they can share a constant-pool entry. 658 if (const ConstantFP *AFP = dyn_cast<ConstantFP>(A)) 659 if (const ConstantInt *BI = dyn_cast<ConstantInt>(B)) 660 return AFP->getValueAPF().bitcastToAPInt() == BI->getValue(); 661 if (const ConstantFP *BFP = dyn_cast<ConstantFP>(B)) 662 if (const ConstantInt *AI = dyn_cast<ConstantInt>(A)) 663 return BFP->getValueAPF().bitcastToAPInt() == AI->getValue(); 664 665 // Two vectors can share an entry if each pair of corresponding 666 // elements could. 667 if (const ConstantVector *AV = dyn_cast<ConstantVector>(A)) 668 if (const ConstantVector *BV = dyn_cast<ConstantVector>(B)) { 669 if (AV->getType()->getNumElements() != BV->getType()->getNumElements()) 670 return false; 671 for (unsigned i = 0, e = AV->getType()->getNumElements(); i != e; ++i) 672 if (!CanShareConstantPoolEntry(AV->getOperand(i), 673 BV->getOperand(i), TD)) 674 return false; 675 return true; 676 } 677 678 // TODO: Handle other cases. 679 680 return false; 681} 682 683/// getConstantPoolIndex - Create a new entry in the constant pool or return 684/// an existing one. User must specify the log2 of the minimum required 685/// alignment for the object. 686/// 687unsigned MachineConstantPool::getConstantPoolIndex(const Constant *C, 688 unsigned Alignment) { 689 assert(Alignment && "Alignment must be specified!"); 690 if (Alignment > PoolAlignment) PoolAlignment = Alignment; 691 692 // Check to see if we already have this constant. 693 // 694 // FIXME, this could be made much more efficient for large constant pools. 695 for (unsigned i = 0, e = Constants.size(); i != e; ++i) 696 if (!Constants[i].isMachineConstantPoolEntry() && 697 CanShareConstantPoolEntry(Constants[i].Val.ConstVal, C, TD)) { 698 if ((unsigned)Constants[i].getAlignment() < Alignment) 699 Constants[i].Alignment = Alignment; 700 return i; 701 } 702 703 Constants.push_back(MachineConstantPoolEntry(C, Alignment)); 704 return Constants.size()-1; 705} 706 707unsigned MachineConstantPool::getConstantPoolIndex(MachineConstantPoolValue *V, 708 unsigned Alignment) { 709 assert(Alignment && "Alignment must be specified!"); 710 if (Alignment > PoolAlignment) PoolAlignment = Alignment; 711 712 // Check to see if we already have this constant. 713 // 714 // FIXME, this could be made much more efficient for large constant pools. 715 int Idx = V->getExistingMachineCPValue(this, Alignment); 716 if (Idx != -1) { 717 MachineCPVsSharingEntries.insert(V); 718 return (unsigned)Idx; 719 } 720 721 Constants.push_back(MachineConstantPoolEntry(V, Alignment)); 722 return Constants.size()-1; 723} 724 725void MachineConstantPool::print(raw_ostream &OS) const { 726 if (Constants.empty()) return; 727 728 OS << "Constant Pool:\n"; 729 for (unsigned i = 0, e = Constants.size(); i != e; ++i) { 730 OS << " cp#" << i << ": "; 731 if (Constants[i].isMachineConstantPoolEntry()) 732 Constants[i].Val.MachineCPVal->print(OS); 733 else 734 OS << *(Value*)Constants[i].Val.ConstVal; 735 OS << ", align=" << Constants[i].getAlignment(); 736 OS << "\n"; 737 } 738} 739 740void MachineConstantPool::dump() const { print(dbgs()); } 741