MachineFunction.cpp revision 204642
1235288Sadrian//===-- MachineFunction.cpp -----------------------------------------------===// 2235288Sadrian// 3235288Sadrian// The LLVM Compiler Infrastructure 4235288Sadrian// 5235288Sadrian// This file is distributed under the University of Illinois Open Source 6235288Sadrian// License. See LICENSE.TXT for details. 7235288Sadrian// 8235288Sadrian//===----------------------------------------------------------------------===// 9235288Sadrian// 10235288Sadrian// Collect native machine code information for a function. This allows 11235288Sadrian// target-specific information about the generated code to be stored with each 12235288Sadrian// function. 13235288Sadrian// 14235288Sadrian//===----------------------------------------------------------------------===// 15235288Sadrian 16235288Sadrian#include "llvm/DerivedTypes.h" 17235288Sadrian#include "llvm/Function.h" 18235288Sadrian#include "llvm/Instructions.h" 19235288Sadrian#include "llvm/Config/config.h" 20235288Sadrian#include "llvm/CodeGen/MachineConstantPool.h" 21235288Sadrian#include "llvm/CodeGen/MachineFunction.h" 22235288Sadrian#include "llvm/CodeGen/MachineFunctionPass.h" 23235288Sadrian#include "llvm/CodeGen/MachineFrameInfo.h" 24235288Sadrian#include "llvm/CodeGen/MachineInstr.h" 25235288Sadrian#include "llvm/CodeGen/MachineJumpTableInfo.h" 26235288Sadrian#include "llvm/CodeGen/MachineRegisterInfo.h" 27235288Sadrian#include "llvm/CodeGen/Passes.h" 28235288Sadrian#include "llvm/MC/MCAsmInfo.h" 29235288Sadrian#include "llvm/MC/MCContext.h" 30235288Sadrian#include "llvm/Analysis/DebugInfo.h" 31235288Sadrian#include "llvm/Support/Debug.h" 32235288Sadrian#include "llvm/Target/TargetData.h" 33235288Sadrian#include "llvm/Target/TargetLowering.h" 34235288Sadrian#include "llvm/Target/TargetMachine.h" 35235288Sadrian#include "llvm/Target/TargetFrameInfo.h" 36235288Sadrian#include "llvm/ADT/SmallString.h" 37235288Sadrian#include "llvm/ADT/STLExtras.h" 38235288Sadrian#include "llvm/Support/GraphWriter.h" 39235288Sadrian#include "llvm/Support/raw_ostream.h" 40235288Sadrianusing namespace llvm; 41235288Sadrian 42235288Sadriannamespace { 43235288Sadrian struct Printer : public MachineFunctionPass { 44235288Sadrian static char ID; 45235288Sadrian 46235288Sadrian raw_ostream &OS; 47235288Sadrian const std::string Banner; 48235288Sadrian 49235288Sadrian Printer(raw_ostream &os, const std::string &banner) 50235288Sadrian : MachineFunctionPass(&ID), OS(os), Banner(banner) {} 51235288Sadrian 52235288Sadrian const char *getPassName() const { return "MachineFunction Printer"; } 53235288Sadrian 54235288Sadrian virtual void getAnalysisUsage(AnalysisUsage &AU) const { 55235288Sadrian AU.setPreservesAll(); 56235288Sadrian MachineFunctionPass::getAnalysisUsage(AU); 57235288Sadrian } 58235288Sadrian 59235288Sadrian bool runOnMachineFunction(MachineFunction &MF) { 60235288Sadrian OS << "# " << Banner << ":\n"; 61235288Sadrian MF.print(OS); 62235323Sadrian return false; 63235288Sadrian } 64235288Sadrian }; 65235288Sadrian char Printer::ID = 0; 66235288Sadrian} 67235288Sadrian 68235288Sadrian/// Returns a newly-created MachineFunction Printer pass. The default banner is 69235288Sadrian/// empty. 70235288Sadrian/// 71235288SadrianFunctionPass *llvm::createMachineFunctionPrinterPass(raw_ostream &OS, 72235288Sadrian const std::string &Banner){ 73235288Sadrian return new Printer(OS, Banner); 74235288Sadrian} 75235288Sadrian 76235288Sadrian//===----------------------------------------------------------------------===// 77235288Sadrian// MachineFunction implementation 78235288Sadrian//===----------------------------------------------------------------------===// 79235288Sadrian 80235288Sadrian// Out of line virtual method. 81235288SadrianMachineFunctionInfo::~MachineFunctionInfo() {} 82235288Sadrian 83235288Sadrianvoid ilist_traits<MachineBasicBlock>::deleteNode(MachineBasicBlock *MBB) { 84235288Sadrian MBB->getParent()->DeleteMachineBasicBlock(MBB); 85235288Sadrian} 86235288Sadrian 87235288SadrianMachineFunction::MachineFunction(Function *F, const TargetMachine &TM, 88235288Sadrian unsigned FunctionNum) 89235288Sadrian : Fn(F), Target(TM) { 90235288Sadrian if (TM.getRegisterInfo()) 91235288Sadrian RegInfo = new (Allocator.Allocate<MachineRegisterInfo>()) 92235288Sadrian MachineRegisterInfo(*TM.getRegisterInfo()); 93235288Sadrian else 94235288Sadrian RegInfo = 0; 95235288Sadrian MFInfo = 0; 96235288Sadrian FrameInfo = new (Allocator.Allocate<MachineFrameInfo>()) 97235288Sadrian MachineFrameInfo(*TM.getFrameInfo()); 98235288Sadrian if (Fn->hasFnAttr(Attribute::StackAlignment)) 99235288Sadrian FrameInfo->setMaxAlignment(Attribute::getStackAlignmentFromAttrs( 100235323Sadrian Fn->getAttributes().getFnAttributes())); 101235323Sadrian ConstantPool = new (Allocator.Allocate<MachineConstantPool>()) 102235323Sadrian MachineConstantPool(TM.getTargetData()); 103235323Sadrian Alignment = TM.getTargetLowering()->getFunctionAlignment(F); 104235323Sadrian FunctionNumber = FunctionNum; 105235323Sadrian JumpTableInfo = 0; 106235323Sadrian} 107235323Sadrian 108235323SadrianMachineFunction::~MachineFunction() { 109235288Sadrian BasicBlocks.clear(); 110235288Sadrian InstructionRecycler.clear(Allocator); 111235288Sadrian BasicBlockRecycler.clear(Allocator); 112235288Sadrian if (RegInfo) { 113235288Sadrian RegInfo->~MachineRegisterInfo(); 114235288Sadrian Allocator.Deallocate(RegInfo); 115235288Sadrian } 116235288Sadrian if (MFInfo) { 117235288Sadrian MFInfo->~MachineFunctionInfo(); 118235288Sadrian Allocator.Deallocate(MFInfo); 119235288Sadrian } 120235288Sadrian FrameInfo->~MachineFrameInfo(); Allocator.Deallocate(FrameInfo); 121235288Sadrian ConstantPool->~MachineConstantPool(); Allocator.Deallocate(ConstantPool); 122235288Sadrian 123235288Sadrian if (JumpTableInfo) { 124235288Sadrian JumpTableInfo->~MachineJumpTableInfo(); 125235288Sadrian Allocator.Deallocate(JumpTableInfo); 126235288Sadrian } 127235323Sadrian} 128235323Sadrian 129235288Sadrian/// getOrCreateJumpTableInfo - Get the JumpTableInfo for this function, if it 130235288Sadrian/// does already exist, allocate one. 131235288SadrianMachineJumpTableInfo *MachineFunction:: 132235288SadriangetOrCreateJumpTableInfo(unsigned EntryKind) { 133235288Sadrian if (JumpTableInfo) return JumpTableInfo; 134235288Sadrian 135235288Sadrian JumpTableInfo = new (Allocator.Allocate<MachineJumpTableInfo>()) 136235288Sadrian MachineJumpTableInfo((MachineJumpTableInfo::JTEntryKind)EntryKind); 137235288Sadrian return JumpTableInfo; 138235288Sadrian} 139235288Sadrian 140235288Sadrian/// RenumberBlocks - This discards all of the MachineBasicBlock numbers and 141235288Sadrian/// recomputes them. This guarantees that the MBB numbers are sequential, 142235288Sadrian/// dense, and match the ordering of the blocks within the function. If a 143235288Sadrian/// specific MachineBasicBlock is specified, only that block and those after 144235288Sadrian/// it are renumbered. 145235288Sadrianvoid MachineFunction::RenumberBlocks(MachineBasicBlock *MBB) { 146235288Sadrian if (empty()) { MBBNumbering.clear(); return; } 147235288Sadrian MachineFunction::iterator MBBI, E = end(); 148235288Sadrian if (MBB == 0) 149235288Sadrian MBBI = begin(); 150235288Sadrian else 151235288Sadrian MBBI = MBB; 152235288Sadrian 153235288Sadrian // Figure out the block number this should have. 154235288Sadrian unsigned BlockNo = 0; 155235288Sadrian if (MBBI != begin()) 156235288Sadrian BlockNo = prior(MBBI)->getNumber()+1; 157235288Sadrian 158235288Sadrian for (; MBBI != E; ++MBBI, ++BlockNo) { 159235288Sadrian if (MBBI->getNumber() != (int)BlockNo) { 160235288Sadrian // Remove use of the old number. 161235288Sadrian if (MBBI->getNumber() != -1) { 162235288Sadrian assert(MBBNumbering[MBBI->getNumber()] == &*MBBI && 163235288Sadrian "MBB number mismatch!"); 164235288Sadrian MBBNumbering[MBBI->getNumber()] = 0; 165235288Sadrian } 166235288Sadrian 167235288Sadrian // If BlockNo is already taken, set that block's number to -1. 168235288Sadrian if (MBBNumbering[BlockNo]) 169235288Sadrian MBBNumbering[BlockNo]->setNumber(-1); 170235288Sadrian 171235288Sadrian MBBNumbering[BlockNo] = MBBI; 172235288Sadrian MBBI->setNumber(BlockNo); 173235288Sadrian } 174235288Sadrian } 175235288Sadrian 176235288Sadrian // Okay, all the blocks are renumbered. If we have compactified the block 177235288Sadrian // numbering, shrink MBBNumbering now. 178235288Sadrian assert(BlockNo <= MBBNumbering.size() && "Mismatch!"); 179235288Sadrian MBBNumbering.resize(BlockNo); 180235288Sadrian} 181235288Sadrian 182235288Sadrian/// CreateMachineInstr - Allocate a new MachineInstr. Use this instead 183235288Sadrian/// of `new MachineInstr'. 184235288Sadrian/// 185235288SadrianMachineInstr * 186235288SadrianMachineFunction::CreateMachineInstr(const TargetInstrDesc &TID, 187235288Sadrian DebugLoc DL, bool NoImp) { 188235288Sadrian return new (InstructionRecycler.Allocate<MachineInstr>(Allocator)) 189235288Sadrian MachineInstr(TID, DL, NoImp); 190235288Sadrian} 191235323Sadrian 192235323Sadrian/// CloneMachineInstr - Create a new MachineInstr which is a copy of the 193235323Sadrian/// 'Orig' instruction, identical in all ways except the instruction 194235288Sadrian/// has no parent, prev, or next. 195235288Sadrian/// 196235288SadrianMachineInstr * 197235288SadrianMachineFunction::CloneMachineInstr(const MachineInstr *Orig) { 198235288Sadrian return new (InstructionRecycler.Allocate<MachineInstr>(Allocator)) 199235288Sadrian MachineInstr(*this, *Orig); 200235288Sadrian} 201235288Sadrian 202235288Sadrian/// DeleteMachineInstr - Delete the given MachineInstr. 203235288Sadrian/// 204235288Sadrianvoid 205235288SadrianMachineFunction::DeleteMachineInstr(MachineInstr *MI) { 206235288Sadrian MI->~MachineInstr(); 207235288Sadrian InstructionRecycler.Deallocate(Allocator, MI); 208235288Sadrian} 209235288Sadrian 210235288Sadrian/// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this 211235288Sadrian/// instead of `new MachineBasicBlock'. 212235288Sadrian/// 213235288SadrianMachineBasicBlock * 214235288SadrianMachineFunction::CreateMachineBasicBlock(const BasicBlock *bb) { 215235288Sadrian return new (BasicBlockRecycler.Allocate<MachineBasicBlock>(Allocator)) 216235288Sadrian MachineBasicBlock(*this, bb); 217235288Sadrian} 218235288Sadrian 219235288Sadrian/// DeleteMachineBasicBlock - Delete the given MachineBasicBlock. 220235288Sadrian/// 221235288Sadrianvoid 222235288SadrianMachineFunction::DeleteMachineBasicBlock(MachineBasicBlock *MBB) { 223235288Sadrian assert(MBB->getParent() == this && "MBB parent mismatch!"); 224235288Sadrian MBB->~MachineBasicBlock(); 225235288Sadrian BasicBlockRecycler.Deallocate(Allocator, MBB); 226235288Sadrian} 227235288Sadrian 228235288SadrianMachineMemOperand * 229235288SadrianMachineFunction::getMachineMemOperand(const Value *v, unsigned f, 230235288Sadrian int64_t o, uint64_t s, 231235288Sadrian unsigned base_alignment) { 232235288Sadrian return new (Allocator.Allocate<MachineMemOperand>()) 233235288Sadrian MachineMemOperand(v, f, o, s, base_alignment); 234235288Sadrian} 235235288Sadrian 236235288SadrianMachineMemOperand * 237235288SadrianMachineFunction::getMachineMemOperand(const MachineMemOperand *MMO, 238235288Sadrian int64_t Offset, uint64_t Size) { 239235288Sadrian return new (Allocator.Allocate<MachineMemOperand>()) 240235288Sadrian MachineMemOperand(MMO->getValue(), MMO->getFlags(), 241235288Sadrian int64_t(uint64_t(MMO->getOffset()) + 242235288Sadrian uint64_t(Offset)), 243235288Sadrian Size, MMO->getBaseAlignment()); 244235288Sadrian} 245235288Sadrian 246235288SadrianMachineInstr::mmo_iterator 247235288SadrianMachineFunction::allocateMemRefsArray(unsigned long Num) { 248235288Sadrian return Allocator.Allocate<MachineMemOperand *>(Num); 249235288Sadrian} 250235288Sadrian 251235288Sadrianstd::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator> 252235288SadrianMachineFunction::extractLoadMemRefs(MachineInstr::mmo_iterator Begin, 253235288Sadrian MachineInstr::mmo_iterator End) { 254235288Sadrian // Count the number of load mem refs. 255235288Sadrian unsigned Num = 0; 256235288Sadrian for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) 257235288Sadrian if ((*I)->isLoad()) 258235288Sadrian ++Num; 259235288Sadrian 260235288Sadrian // Allocate a new array and populate it with the load information. 261235288Sadrian MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num); 262235288Sadrian unsigned Index = 0; 263235288Sadrian for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) { 264235288Sadrian if ((*I)->isLoad()) { 265235288Sadrian if (!(*I)->isStore()) 266235288Sadrian // Reuse the MMO. 267235288Sadrian Result[Index] = *I; 268235288Sadrian else { 269235288Sadrian // Clone the MMO and unset the store flag. 270235288Sadrian MachineMemOperand *JustLoad = 271235288Sadrian getMachineMemOperand((*I)->getValue(), 272235288Sadrian (*I)->getFlags() & ~MachineMemOperand::MOStore, 273235288Sadrian (*I)->getOffset(), (*I)->getSize(), 274235288Sadrian (*I)->getBaseAlignment()); 275235288Sadrian Result[Index] = JustLoad; 276235288Sadrian } 277235288Sadrian ++Index; 278235288Sadrian } 279235288Sadrian } 280235288Sadrian return std::make_pair(Result, Result + Num); 281235288Sadrian} 282235288Sadrian 283235288Sadrianstd::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator> 284235288SadrianMachineFunction::extractStoreMemRefs(MachineInstr::mmo_iterator Begin, 285235288Sadrian MachineInstr::mmo_iterator End) { 286235288Sadrian // Count the number of load mem refs. 287235288Sadrian unsigned Num = 0; 288235288Sadrian for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) 289235288Sadrian if ((*I)->isStore()) 290235288Sadrian ++Num; 291235288Sadrian 292235288Sadrian // Allocate a new array and populate it with the store information. 293235288Sadrian MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num); 294235288Sadrian unsigned Index = 0; 295235288Sadrian for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) { 296235288Sadrian if ((*I)->isStore()) { 297235288Sadrian if (!(*I)->isLoad()) 298235288Sadrian // Reuse the MMO. 299235288Sadrian Result[Index] = *I; 300235288Sadrian else { 301235288Sadrian // Clone the MMO and unset the load flag. 302235288Sadrian MachineMemOperand *JustStore = 303235288Sadrian getMachineMemOperand((*I)->getValue(), 304235288Sadrian (*I)->getFlags() & ~MachineMemOperand::MOLoad, 305235288Sadrian (*I)->getOffset(), (*I)->getSize(), 306235288Sadrian (*I)->getBaseAlignment()); 307235288Sadrian Result[Index] = JustStore; 308235288Sadrian } 309235288Sadrian ++Index; 310235288Sadrian } 311235288Sadrian } 312235288Sadrian return std::make_pair(Result, Result + Num); 313235288Sadrian} 314235288Sadrian 315235288Sadrianvoid MachineFunction::dump() const { 316235288Sadrian print(dbgs()); 317235288Sadrian} 318235288Sadrian 319235288Sadrianvoid MachineFunction::print(raw_ostream &OS) const { 320235288Sadrian OS << "# Machine code for function " << Fn->getName() << ":\n"; 321235288Sadrian 322235288Sadrian // Print Frame Information 323235288Sadrian FrameInfo->print(*this, OS); 324235288Sadrian 325235288Sadrian // Print JumpTable Information 326235288Sadrian if (JumpTableInfo) 327235288Sadrian JumpTableInfo->print(OS); 328235288Sadrian 329235288Sadrian // Print Constant Pool 330235288Sadrian ConstantPool->print(OS); 331235288Sadrian 332235288Sadrian const TargetRegisterInfo *TRI = getTarget().getRegisterInfo(); 333235288Sadrian 334235288Sadrian if (RegInfo && !RegInfo->livein_empty()) { 335235288Sadrian OS << "Function Live Ins: "; 336235288Sadrian for (MachineRegisterInfo::livein_iterator 337235288Sadrian I = RegInfo->livein_begin(), E = RegInfo->livein_end(); I != E; ++I) { 338235288Sadrian if (TRI) 339235288Sadrian OS << "%" << TRI->getName(I->first); 340235288Sadrian else 341235288Sadrian OS << " %physreg" << I->first; 342235288Sadrian 343235288Sadrian if (I->second) 344235288Sadrian OS << " in reg%" << I->second; 345235288Sadrian 346235288Sadrian if (llvm::next(I) != E) 347235288Sadrian OS << ", "; 348235288Sadrian } 349235288Sadrian OS << '\n'; 350235288Sadrian } 351235288Sadrian if (RegInfo && !RegInfo->liveout_empty()) { 352235288Sadrian OS << "Function Live Outs: "; 353235288Sadrian for (MachineRegisterInfo::liveout_iterator 354235288Sadrian I = RegInfo->liveout_begin(), E = RegInfo->liveout_end(); I != E; ++I){ 355235288Sadrian if (TRI) 356235288Sadrian OS << '%' << TRI->getName(*I); 357235288Sadrian else 358235288Sadrian OS << "%physreg" << *I; 359235288Sadrian 360235288Sadrian if (llvm::next(I) != E) 361235288Sadrian OS << " "; 362235288Sadrian } 363235288Sadrian OS << '\n'; 364235288Sadrian } 365235288Sadrian 366235288Sadrian for (const_iterator BB = begin(), E = end(); BB != E; ++BB) { 367235288Sadrian OS << '\n'; 368235288Sadrian BB->print(OS); 369235288Sadrian } 370235288Sadrian 371235288Sadrian OS << "\n# End machine code for function " << Fn->getName() << ".\n\n"; 372235288Sadrian} 373235288Sadrian 374235288Sadriannamespace llvm { 375235288Sadrian template<> 376235288Sadrian struct DOTGraphTraits<const MachineFunction*> : public DefaultDOTGraphTraits { 377235288Sadrian 378235288Sadrian DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {} 379235288Sadrian 380235288Sadrian static std::string getGraphName(const MachineFunction *F) { 381235288Sadrian return "CFG for '" + F->getFunction()->getNameStr() + "' function"; 382235288Sadrian } 383235288Sadrian 384235288Sadrian std::string getNodeLabel(const MachineBasicBlock *Node, 385235288Sadrian const MachineFunction *Graph) { 386235288Sadrian if (isSimple () && Node->getBasicBlock() && 387235288Sadrian !Node->getBasicBlock()->getName().empty()) 388235288Sadrian return Node->getBasicBlock()->getNameStr() + ":"; 389235288Sadrian 390235288Sadrian std::string OutStr; 391235288Sadrian { 392235288Sadrian raw_string_ostream OSS(OutStr); 393235288Sadrian 394235288Sadrian if (isSimple()) 395235288Sadrian OSS << Node->getNumber() << ':'; 396235288Sadrian else 397235288Sadrian Node->print(OSS); 398235288Sadrian } 399235288Sadrian 400235288Sadrian if (OutStr[0] == '\n') OutStr.erase(OutStr.begin()); 401235288Sadrian 402235288Sadrian // Process string output to make it nicer... 403235288Sadrian for (unsigned i = 0; i != OutStr.length(); ++i) 404235288Sadrian if (OutStr[i] == '\n') { // Left justify 405235288Sadrian OutStr[i] = '\\'; 406235288Sadrian OutStr.insert(OutStr.begin()+i+1, 'l'); 407235288Sadrian } 408235288Sadrian return OutStr; 409235288Sadrian } 410235288Sadrian }; 411235288Sadrian} 412235288Sadrian 413235288Sadrianvoid MachineFunction::viewCFG() const 414235288Sadrian{ 415235288Sadrian#ifndef NDEBUG 416235288Sadrian ViewGraph(this, "mf" + getFunction()->getNameStr()); 417235288Sadrian#else 418235288Sadrian errs() << "SelectionDAG::viewGraph is only available in debug builds on " 419235288Sadrian << "systems with Graphviz or gv!\n"; 420235288Sadrian#endif // NDEBUG 421235288Sadrian} 422235288Sadrian 423235288Sadrianvoid MachineFunction::viewCFGOnly() const 424235288Sadrian{ 425235288Sadrian#ifndef NDEBUG 426235288Sadrian ViewGraph(this, "mf" + getFunction()->getNameStr(), true); 427235288Sadrian#else 428235288Sadrian errs() << "SelectionDAG::viewGraph is only available in debug builds on " 429235288Sadrian << "systems with Graphviz or gv!\n"; 430235288Sadrian#endif // NDEBUG 431235288Sadrian} 432235288Sadrian 433235288Sadrian/// addLiveIn - Add the specified physical register as a live-in value and 434235288Sadrian/// create a corresponding virtual register for it. 435235288Sadrianunsigned MachineFunction::addLiveIn(unsigned PReg, 436235288Sadrian const TargetRegisterClass *RC) { 437235288Sadrian assert(RC->contains(PReg) && "Not the correct regclass!"); 438235288Sadrian unsigned VReg = getRegInfo().createVirtualRegister(RC); 439235288Sadrian getRegInfo().addLiveIn(PReg, VReg); 440235288Sadrian return VReg; 441235288Sadrian} 442235288Sadrian 443235288Sadrian/// getDILocation - Get the DILocation for a given DebugLoc object. 444235288SadrianDILocation MachineFunction::getDILocation(DebugLoc DL) const { 445235288Sadrian unsigned Idx = DL.getIndex(); 446235288Sadrian assert(Idx < DebugLocInfo.DebugLocations.size() && 447235288Sadrian "Invalid index into debug locations!"); 448235288Sadrian return DILocation(DebugLocInfo.DebugLocations[Idx]); 449235288Sadrian} 450235288Sadrian 451235288Sadrian 452235288Sadrian/// getJTISymbol - Return the MCSymbol for the specified non-empty jump table. 453235288Sadrian/// If isLinkerPrivate is specified, an 'l' label is returned, otherwise a 454235288Sadrian/// normal 'L' label is returned. 455235288SadrianMCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx, 456235288Sadrian bool isLinkerPrivate) const { 457235288Sadrian assert(JumpTableInfo && "No jump tables"); 458235288Sadrian 459235288Sadrian assert(JTI < JumpTableInfo->getJumpTables().size() && "Invalid JTI!"); 460235288Sadrian const MCAsmInfo &MAI = *getTarget().getMCAsmInfo(); 461235288Sadrian 462235288Sadrian const char *Prefix = isLinkerPrivate ? MAI.getLinkerPrivateGlobalPrefix() : 463235288Sadrian MAI.getPrivateGlobalPrefix(); 464235288Sadrian SmallString<60> Name; 465235288Sadrian raw_svector_ostream(Name) 466235288Sadrian << Prefix << "JTI" << getFunctionNumber() << '_' << JTI; 467235288Sadrian return Ctx.GetOrCreateSymbol(Name.str()); 468235288Sadrian} 469235288Sadrian 470235288Sadrian 471235288Sadrian//===----------------------------------------------------------------------===// 472235288Sadrian// MachineFrameInfo implementation 473235288Sadrian//===----------------------------------------------------------------------===// 474235288Sadrian 475235288Sadrian/// CreateFixedObject - Create a new object at a fixed location on the stack. 476235288Sadrian/// All fixed objects should be created before other objects are created for 477235288Sadrian/// efficiency. By default, fixed objects are immutable. This returns an 478235288Sadrian/// index with a negative value. 479235288Sadrian/// 480235288Sadrianint MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset, 481235288Sadrian bool Immutable, bool isSS) { 482235288Sadrian assert(Size != 0 && "Cannot allocate zero size fixed stack objects!"); 483235288Sadrian Objects.insert(Objects.begin(), StackObject(Size, 1, SPOffset, Immutable, 484235288Sadrian isSS)); 485235288Sadrian return -++NumFixedObjects; 486235288Sadrian} 487235288Sadrian 488235288Sadrian 489235288SadrianBitVector 490235288SadrianMachineFrameInfo::getPristineRegs(const MachineBasicBlock *MBB) const { 491235288Sadrian assert(MBB && "MBB must be valid"); 492235288Sadrian const MachineFunction *MF = MBB->getParent(); 493235288Sadrian assert(MF && "MBB must be part of a MachineFunction"); 494235288Sadrian const TargetMachine &TM = MF->getTarget(); 495235288Sadrian const TargetRegisterInfo *TRI = TM.getRegisterInfo(); 496235288Sadrian BitVector BV(TRI->getNumRegs()); 497235288Sadrian 498235288Sadrian // Before CSI is calculated, no registers are considered pristine. They can be 499235288Sadrian // freely used and PEI will make sure they are saved. 500235288Sadrian if (!isCalleeSavedInfoValid()) 501235288Sadrian return BV; 502235288Sadrian 503235288Sadrian for (const unsigned *CSR = TRI->getCalleeSavedRegs(MF); CSR && *CSR; ++CSR) 504235288Sadrian BV.set(*CSR); 505235288Sadrian 506235288Sadrian // The entry MBB always has all CSRs pristine. 507235288Sadrian if (MBB == &MF->front()) 508235288Sadrian return BV; 509235288Sadrian 510235288Sadrian // On other MBBs the saved CSRs are not pristine. 511235288Sadrian const std::vector<CalleeSavedInfo> &CSI = getCalleeSavedInfo(); 512235288Sadrian for (std::vector<CalleeSavedInfo>::const_iterator I = CSI.begin(), 513235288Sadrian E = CSI.end(); I != E; ++I) 514235288Sadrian BV.reset(I->getReg()); 515235288Sadrian 516235288Sadrian return BV; 517235288Sadrian} 518235288Sadrian 519235288Sadrian 520235288Sadrianvoid MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{ 521235288Sadrian if (Objects.empty()) return; 522235288Sadrian 523235288Sadrian const TargetFrameInfo *FI = MF.getTarget().getFrameInfo(); 524235288Sadrian int ValOffset = (FI ? FI->getOffsetOfLocalArea() : 0); 525235288Sadrian 526235288Sadrian OS << "Frame Objects:\n"; 527235288Sadrian 528235288Sadrian for (unsigned i = 0, e = Objects.size(); i != e; ++i) { 529235288Sadrian const StackObject &SO = Objects[i]; 530235288Sadrian OS << " fi#" << (int)(i-NumFixedObjects) << ": "; 531235288Sadrian if (SO.Size == ~0ULL) { 532235288Sadrian OS << "dead\n"; 533235288Sadrian continue; 534235288Sadrian } 535235288Sadrian if (SO.Size == 0) 536235288Sadrian OS << "variable sized"; 537235288Sadrian else 538235288Sadrian OS << "size=" << SO.Size; 539235288Sadrian OS << ", align=" << SO.Alignment; 540235288Sadrian 541235288Sadrian if (i < NumFixedObjects) 542235288Sadrian OS << ", fixed"; 543235288Sadrian if (i < NumFixedObjects || SO.SPOffset != -1) { 544235288Sadrian int64_t Off = SO.SPOffset - ValOffset; 545235288Sadrian OS << ", at location [SP"; 546235288Sadrian if (Off > 0) 547235288Sadrian OS << "+" << Off; 548235288Sadrian else if (Off < 0) 549235288Sadrian OS << Off; 550235288Sadrian OS << "]"; 551235288Sadrian } 552235288Sadrian OS << "\n"; 553235288Sadrian } 554235288Sadrian} 555235288Sadrian 556235288Sadrianvoid MachineFrameInfo::dump(const MachineFunction &MF) const { 557235288Sadrian print(MF, dbgs()); 558235288Sadrian} 559235288Sadrian 560235288Sadrian//===----------------------------------------------------------------------===// 561235288Sadrian// MachineJumpTableInfo implementation 562235288Sadrian//===----------------------------------------------------------------------===// 563235288Sadrian 564235288Sadrian/// getEntrySize - Return the size of each entry in the jump table. 565235288Sadrianunsigned MachineJumpTableInfo::getEntrySize(const TargetData &TD) const { 566235288Sadrian // The size of a jump table entry is 4 bytes unless the entry is just the 567235288Sadrian // address of a block, in which case it is the pointer size. 568235288Sadrian switch (getEntryKind()) { 569235288Sadrian case MachineJumpTableInfo::EK_BlockAddress: 570235288Sadrian return TD.getPointerSize(); 571235288Sadrian case MachineJumpTableInfo::EK_GPRel32BlockAddress: 572 case MachineJumpTableInfo::EK_LabelDifference32: 573 case MachineJumpTableInfo::EK_Custom32: 574 return 4; 575 } 576 assert(0 && "Unknown jump table encoding!"); 577 return ~0; 578} 579 580/// getEntryAlignment - Return the alignment of each entry in the jump table. 581unsigned MachineJumpTableInfo::getEntryAlignment(const TargetData &TD) const { 582 // The alignment of a jump table entry is the alignment of int32 unless the 583 // entry is just the address of a block, in which case it is the pointer 584 // alignment. 585 switch (getEntryKind()) { 586 case MachineJumpTableInfo::EK_BlockAddress: 587 return TD.getPointerABIAlignment(); 588 case MachineJumpTableInfo::EK_GPRel32BlockAddress: 589 case MachineJumpTableInfo::EK_LabelDifference32: 590 case MachineJumpTableInfo::EK_Custom32: 591 return TD.getABIIntegerTypeAlignment(32); 592 } 593 assert(0 && "Unknown jump table encoding!"); 594 return ~0; 595} 596 597/// getJumpTableIndex - Create a new jump table entry in the jump table info 598/// or return an existing one. 599/// 600unsigned MachineJumpTableInfo::getJumpTableIndex( 601 const std::vector<MachineBasicBlock*> &DestBBs) { 602 assert(!DestBBs.empty() && "Cannot create an empty jump table!"); 603 JumpTables.push_back(MachineJumpTableEntry(DestBBs)); 604 return JumpTables.size()-1; 605} 606 607 608/// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update 609/// the jump tables to branch to New instead. 610bool MachineJumpTableInfo::ReplaceMBBInJumpTables(MachineBasicBlock *Old, 611 MachineBasicBlock *New) { 612 assert(Old != New && "Not making a change?"); 613 bool MadeChange = false; 614 for (size_t i = 0, e = JumpTables.size(); i != e; ++i) 615 ReplaceMBBInJumpTable(i, Old, New); 616 return MadeChange; 617} 618 619/// ReplaceMBBInJumpTable - If Old is a target of the jump tables, update 620/// the jump table to branch to New instead. 621bool MachineJumpTableInfo::ReplaceMBBInJumpTable(unsigned Idx, 622 MachineBasicBlock *Old, 623 MachineBasicBlock *New) { 624 assert(Old != New && "Not making a change?"); 625 bool MadeChange = false; 626 MachineJumpTableEntry &JTE = JumpTables[Idx]; 627 for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j) 628 if (JTE.MBBs[j] == Old) { 629 JTE.MBBs[j] = New; 630 MadeChange = true; 631 } 632 return MadeChange; 633} 634 635void MachineJumpTableInfo::print(raw_ostream &OS) const { 636 if (JumpTables.empty()) return; 637 638 OS << "Jump Tables:\n"; 639 640 for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) { 641 OS << " jt#" << i << ": "; 642 for (unsigned j = 0, f = JumpTables[i].MBBs.size(); j != f; ++j) 643 OS << " BB#" << JumpTables[i].MBBs[j]->getNumber(); 644 } 645 646 OS << '\n'; 647} 648 649void MachineJumpTableInfo::dump() const { print(dbgs()); } 650 651 652//===----------------------------------------------------------------------===// 653// MachineConstantPool implementation 654//===----------------------------------------------------------------------===// 655 656const Type *MachineConstantPoolEntry::getType() const { 657 if (isMachineConstantPoolEntry()) 658 return Val.MachineCPVal->getType(); 659 return Val.ConstVal->getType(); 660} 661 662 663unsigned MachineConstantPoolEntry::getRelocationInfo() const { 664 if (isMachineConstantPoolEntry()) 665 return Val.MachineCPVal->getRelocationInfo(); 666 return Val.ConstVal->getRelocationInfo(); 667} 668 669MachineConstantPool::~MachineConstantPool() { 670 for (unsigned i = 0, e = Constants.size(); i != e; ++i) 671 if (Constants[i].isMachineConstantPoolEntry()) 672 delete Constants[i].Val.MachineCPVal; 673} 674 675/// CanShareConstantPoolEntry - Test whether the given two constants 676/// can be allocated the same constant pool entry. 677static bool CanShareConstantPoolEntry(Constant *A, Constant *B, 678 const TargetData *TD) { 679 // Handle the trivial case quickly. 680 if (A == B) return true; 681 682 // If they have the same type but weren't the same constant, quickly 683 // reject them. 684 if (A->getType() == B->getType()) return false; 685 686 // For now, only support constants with the same size. 687 if (TD->getTypeStoreSize(A->getType()) != TD->getTypeStoreSize(B->getType())) 688 return false; 689 690 // If a floating-point value and an integer value have the same encoding, 691 // they can share a constant-pool entry. 692 if (ConstantFP *AFP = dyn_cast<ConstantFP>(A)) 693 if (ConstantInt *BI = dyn_cast<ConstantInt>(B)) 694 return AFP->getValueAPF().bitcastToAPInt() == BI->getValue(); 695 if (ConstantFP *BFP = dyn_cast<ConstantFP>(B)) 696 if (ConstantInt *AI = dyn_cast<ConstantInt>(A)) 697 return BFP->getValueAPF().bitcastToAPInt() == AI->getValue(); 698 699 // Two vectors can share an entry if each pair of corresponding 700 // elements could. 701 if (ConstantVector *AV = dyn_cast<ConstantVector>(A)) 702 if (ConstantVector *BV = dyn_cast<ConstantVector>(B)) { 703 if (AV->getType()->getNumElements() != BV->getType()->getNumElements()) 704 return false; 705 for (unsigned i = 0, e = AV->getType()->getNumElements(); i != e; ++i) 706 if (!CanShareConstantPoolEntry(AV->getOperand(i), 707 BV->getOperand(i), TD)) 708 return false; 709 return true; 710 } 711 712 // TODO: Handle other cases. 713 714 return false; 715} 716 717/// getConstantPoolIndex - Create a new entry in the constant pool or return 718/// an existing one. User must specify the log2 of the minimum required 719/// alignment for the object. 720/// 721unsigned MachineConstantPool::getConstantPoolIndex(Constant *C, 722 unsigned Alignment) { 723 assert(Alignment && "Alignment must be specified!"); 724 if (Alignment > PoolAlignment) PoolAlignment = Alignment; 725 726 // Check to see if we already have this constant. 727 // 728 // FIXME, this could be made much more efficient for large constant pools. 729 for (unsigned i = 0, e = Constants.size(); i != e; ++i) 730 if (!Constants[i].isMachineConstantPoolEntry() && 731 CanShareConstantPoolEntry(Constants[i].Val.ConstVal, C, TD)) { 732 if ((unsigned)Constants[i].getAlignment() < Alignment) 733 Constants[i].Alignment = Alignment; 734 return i; 735 } 736 737 Constants.push_back(MachineConstantPoolEntry(C, Alignment)); 738 return Constants.size()-1; 739} 740 741unsigned MachineConstantPool::getConstantPoolIndex(MachineConstantPoolValue *V, 742 unsigned Alignment) { 743 assert(Alignment && "Alignment must be specified!"); 744 if (Alignment > PoolAlignment) PoolAlignment = Alignment; 745 746 // Check to see if we already have this constant. 747 // 748 // FIXME, this could be made much more efficient for large constant pools. 749 int Idx = V->getExistingMachineCPValue(this, Alignment); 750 if (Idx != -1) 751 return (unsigned)Idx; 752 753 Constants.push_back(MachineConstantPoolEntry(V, Alignment)); 754 return Constants.size()-1; 755} 756 757void MachineConstantPool::print(raw_ostream &OS) const { 758 if (Constants.empty()) return; 759 760 OS << "Constant Pool:\n"; 761 for (unsigned i = 0, e = Constants.size(); i != e; ++i) { 762 OS << " cp#" << i << ": "; 763 if (Constants[i].isMachineConstantPoolEntry()) 764 Constants[i].Val.MachineCPVal->print(OS); 765 else 766 OS << *(Value*)Constants[i].Val.ConstVal; 767 OS << ", align=" << Constants[i].getAlignment(); 768 OS << "\n"; 769 } 770} 771 772void MachineConstantPool::dump() const { print(dbgs()); } 773