1 //===-- MachineFunction.cpp -----------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Collect native machine code information for a function. This allows
11 // target-specific information about the generated code to be stored with each
14 //===----------------------------------------------------------------------===//
16 #include "llvm/CodeGen/MachineFunction.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/SmallString.h"
19 #include "llvm/Analysis/ConstantFolding.h"
20 #include "llvm/CodeGen/MachineConstantPool.h"
21 #include "llvm/CodeGen/MachineFrameInfo.h"
22 #include "llvm/CodeGen/MachineFunctionPass.h"
23 #include "llvm/CodeGen/MachineInstr.h"
24 #include "llvm/CodeGen/MachineJumpTableInfo.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/CodeGen/MachineRegisterInfo.h"
27 #include "llvm/CodeGen/Passes.h"
28 #include "llvm/DebugInfo.h"
29 #include "llvm/IR/DataLayout.h"
30 #include "llvm/IR/Function.h"
31 #include "llvm/MC/MCAsmInfo.h"
32 #include "llvm/MC/MCContext.h"
33 #include "llvm/Support/Debug.h"
34 #include "llvm/Support/GraphWriter.h"
35 #include "llvm/Support/raw_ostream.h"
36 #include "llvm/Target/TargetFrameLowering.h"
37 #include "llvm/Target/TargetLowering.h"
38 #include "llvm/Target/TargetMachine.h"
41 //===----------------------------------------------------------------------===//
42 // MachineFunction implementation
43 //===----------------------------------------------------------------------===//
45 // Out of line virtual method.
46 MachineFunctionInfo::~MachineFunctionInfo() {}
48 void ilist_traits<MachineBasicBlock>::deleteNode(MachineBasicBlock *MBB) {
49 MBB->getParent()->DeleteMachineBasicBlock(MBB);
52 MachineFunction::MachineFunction(const Function *F, const TargetMachine &TM,
53 unsigned FunctionNum, MachineModuleInfo &mmi,
55 : Fn(F), Target(TM), Ctx(mmi.getContext()), MMI(mmi), GMI(gmi) {
56 if (TM.getRegisterInfo())
57 RegInfo = new (Allocator) MachineRegisterInfo(*TM.getRegisterInfo());
61 FrameInfo = new (Allocator) MachineFrameInfo(*TM.getFrameLowering(),
62 TM.Options.RealignStack);
63 if (Fn->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
64 Attribute::StackAlignment))
65 FrameInfo->ensureMaxAlignment(Fn->getAttributes().
66 getStackAlignment(AttributeSet::FunctionIndex));
67 ConstantPool = new (Allocator) MachineConstantPool(TM.getDataLayout());
68 Alignment = TM.getTargetLowering()->getMinFunctionAlignment();
69 // FIXME: Shouldn't use pref alignment if explicit alignment is set on Fn.
70 if (!Fn->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
71 Attribute::OptimizeForSize))
72 Alignment = std::max(Alignment,
73 TM.getTargetLowering()->getPrefFunctionAlignment());
74 FunctionNumber = FunctionNum;
78 MachineFunction::~MachineFunction() {
79 // Don't call destructors on MachineInstr and MachineOperand. All of their
80 // memory comes from the BumpPtrAllocator which is about to be purged.
82 // Do call MachineBasicBlock destructors, it contains std::vectors.
83 for (iterator I = begin(), E = end(); I != E; I = BasicBlocks.erase(I))
84 I->Insts.clearAndLeakNodesUnsafely();
86 InstructionRecycler.clear(Allocator);
87 OperandRecycler.clear(Allocator);
88 BasicBlockRecycler.clear(Allocator);
90 RegInfo->~MachineRegisterInfo();
91 Allocator.Deallocate(RegInfo);
94 MFInfo->~MachineFunctionInfo();
95 Allocator.Deallocate(MFInfo);
98 FrameInfo->~MachineFrameInfo();
99 Allocator.Deallocate(FrameInfo);
101 ConstantPool->~MachineConstantPool();
102 Allocator.Deallocate(ConstantPool);
105 JumpTableInfo->~MachineJumpTableInfo();
106 Allocator.Deallocate(JumpTableInfo);
110 /// getOrCreateJumpTableInfo - Get the JumpTableInfo for this function, if it
111 /// does already exist, allocate one.
112 MachineJumpTableInfo *MachineFunction::
113 getOrCreateJumpTableInfo(unsigned EntryKind) {
114 if (JumpTableInfo) return JumpTableInfo;
116 JumpTableInfo = new (Allocator)
117 MachineJumpTableInfo((MachineJumpTableInfo::JTEntryKind)EntryKind);
118 return JumpTableInfo;
121 /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
122 /// recomputes them. This guarantees that the MBB numbers are sequential,
123 /// dense, and match the ordering of the blocks within the function. If a
124 /// specific MachineBasicBlock is specified, only that block and those after
125 /// it are renumbered.
126 void MachineFunction::RenumberBlocks(MachineBasicBlock *MBB) {
127 if (empty()) { MBBNumbering.clear(); return; }
128 MachineFunction::iterator MBBI, E = end();
134 // Figure out the block number this should have.
135 unsigned BlockNo = 0;
137 BlockNo = prior(MBBI)->getNumber()+1;
139 for (; MBBI != E; ++MBBI, ++BlockNo) {
140 if (MBBI->getNumber() != (int)BlockNo) {
141 // Remove use of the old number.
142 if (MBBI->getNumber() != -1) {
143 assert(MBBNumbering[MBBI->getNumber()] == &*MBBI &&
144 "MBB number mismatch!");
145 MBBNumbering[MBBI->getNumber()] = 0;
148 // If BlockNo is already taken, set that block's number to -1.
149 if (MBBNumbering[BlockNo])
150 MBBNumbering[BlockNo]->setNumber(-1);
152 MBBNumbering[BlockNo] = MBBI;
153 MBBI->setNumber(BlockNo);
157 // Okay, all the blocks are renumbered. If we have compactified the block
158 // numbering, shrink MBBNumbering now.
159 assert(BlockNo <= MBBNumbering.size() && "Mismatch!");
160 MBBNumbering.resize(BlockNo);
163 /// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
164 /// of `new MachineInstr'.
167 MachineFunction::CreateMachineInstr(const MCInstrDesc &MCID,
168 DebugLoc DL, bool NoImp) {
169 return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
170 MachineInstr(*this, MCID, DL, NoImp);
173 /// CloneMachineInstr - Create a new MachineInstr which is a copy of the
174 /// 'Orig' instruction, identical in all ways except the instruction
175 /// has no parent, prev, or next.
178 MachineFunction::CloneMachineInstr(const MachineInstr *Orig) {
179 return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
180 MachineInstr(*this, *Orig);
183 /// DeleteMachineInstr - Delete the given MachineInstr.
185 /// This function also serves as the MachineInstr destructor - the real
186 /// ~MachineInstr() destructor must be empty.
188 MachineFunction::DeleteMachineInstr(MachineInstr *MI) {
189 // Strip it for parts. The operand array and the MI object itself are
190 // independently recyclable.
192 deallocateOperandArray(MI->CapOperands, MI->Operands);
193 // Don't call ~MachineInstr() which must be trivial anyway because
194 // ~MachineFunction drops whole lists of MachineInstrs wihout calling their
196 InstructionRecycler.Deallocate(Allocator, MI);
199 /// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
200 /// instead of `new MachineBasicBlock'.
203 MachineFunction::CreateMachineBasicBlock(const BasicBlock *bb) {
204 return new (BasicBlockRecycler.Allocate<MachineBasicBlock>(Allocator))
205 MachineBasicBlock(*this, bb);
208 /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
211 MachineFunction::DeleteMachineBasicBlock(MachineBasicBlock *MBB) {
212 assert(MBB->getParent() == this && "MBB parent mismatch!");
213 MBB->~MachineBasicBlock();
214 BasicBlockRecycler.Deallocate(Allocator, MBB);
218 MachineFunction::getMachineMemOperand(MachinePointerInfo PtrInfo, unsigned f,
219 uint64_t s, unsigned base_alignment,
220 const MDNode *TBAAInfo,
221 const MDNode *Ranges) {
222 return new (Allocator) MachineMemOperand(PtrInfo, f, s, base_alignment,
227 MachineFunction::getMachineMemOperand(const MachineMemOperand *MMO,
228 int64_t Offset, uint64_t Size) {
229 return new (Allocator)
230 MachineMemOperand(MachinePointerInfo(MMO->getValue(),
231 MMO->getOffset()+Offset),
232 MMO->getFlags(), Size,
233 MMO->getBaseAlignment(), 0);
236 MachineInstr::mmo_iterator
237 MachineFunction::allocateMemRefsArray(unsigned long Num) {
238 return Allocator.Allocate<MachineMemOperand *>(Num);
241 std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator>
242 MachineFunction::extractLoadMemRefs(MachineInstr::mmo_iterator Begin,
243 MachineInstr::mmo_iterator End) {
244 // Count the number of load mem refs.
246 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I)
250 // Allocate a new array and populate it with the load information.
251 MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num);
253 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) {
254 if ((*I)->isLoad()) {
255 if (!(*I)->isStore())
259 // Clone the MMO and unset the store flag.
260 MachineMemOperand *JustLoad =
261 getMachineMemOperand((*I)->getPointerInfo(),
262 (*I)->getFlags() & ~MachineMemOperand::MOStore,
263 (*I)->getSize(), (*I)->getBaseAlignment(),
264 (*I)->getTBAAInfo());
265 Result[Index] = JustLoad;
270 return std::make_pair(Result, Result + Num);
273 std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator>
274 MachineFunction::extractStoreMemRefs(MachineInstr::mmo_iterator Begin,
275 MachineInstr::mmo_iterator End) {
276 // Count the number of load mem refs.
278 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I)
282 // Allocate a new array and populate it with the store information.
283 MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num);
285 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) {
286 if ((*I)->isStore()) {
291 // Clone the MMO and unset the load flag.
292 MachineMemOperand *JustStore =
293 getMachineMemOperand((*I)->getPointerInfo(),
294 (*I)->getFlags() & ~MachineMemOperand::MOLoad,
295 (*I)->getSize(), (*I)->getBaseAlignment(),
296 (*I)->getTBAAInfo());
297 Result[Index] = JustStore;
302 return std::make_pair(Result, Result + Num);
305 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
306 void MachineFunction::dump() const {
311 StringRef MachineFunction::getName() const {
312 assert(getFunction() && "No function!");
313 return getFunction()->getName();
316 void MachineFunction::print(raw_ostream &OS, SlotIndexes *Indexes) const {
317 OS << "# Machine code for function " << getName() << ": ";
319 OS << (RegInfo->isSSA() ? "SSA" : "Post SSA");
320 if (!RegInfo->tracksLiveness())
321 OS << ", not tracking liveness";
325 // Print Frame Information
326 FrameInfo->print(*this, OS);
328 // Print JumpTable Information
330 JumpTableInfo->print(OS);
332 // Print Constant Pool
333 ConstantPool->print(OS);
335 const TargetRegisterInfo *TRI = getTarget().getRegisterInfo();
337 if (RegInfo && !RegInfo->livein_empty()) {
338 OS << "Function Live Ins: ";
339 for (MachineRegisterInfo::livein_iterator
340 I = RegInfo->livein_begin(), E = RegInfo->livein_end(); I != E; ++I) {
341 OS << PrintReg(I->first, TRI);
343 OS << " in " << PrintReg(I->second, TRI);
344 if (llvm::next(I) != E)
349 if (RegInfo && !RegInfo->liveout_empty()) {
350 OS << "Function Live Outs:";
351 for (MachineRegisterInfo::liveout_iterator
352 I = RegInfo->liveout_begin(), E = RegInfo->liveout_end(); I != E; ++I)
353 OS << ' ' << PrintReg(*I, TRI);
357 for (const_iterator BB = begin(), E = end(); BB != E; ++BB) {
359 BB->print(OS, Indexes);
362 OS << "\n# End machine code for function " << getName() << ".\n\n";
367 struct DOTGraphTraits<const MachineFunction*> : public DefaultDOTGraphTraits {
369 DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {}
371 static std::string getGraphName(const MachineFunction *F) {
372 return "CFG for '" + F->getName().str() + "' function";
375 std::string getNodeLabel(const MachineBasicBlock *Node,
376 const MachineFunction *Graph) {
379 raw_string_ostream OSS(OutStr);
382 OSS << "BB#" << Node->getNumber();
383 if (const BasicBlock *BB = Node->getBasicBlock())
384 OSS << ": " << BB->getName();
389 if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());
391 // Process string output to make it nicer...
392 for (unsigned i = 0; i != OutStr.length(); ++i)
393 if (OutStr[i] == '\n') { // Left justify
395 OutStr.insert(OutStr.begin()+i+1, 'l');
402 void MachineFunction::viewCFG() const
405 ViewGraph(this, "mf" + getName());
407 errs() << "MachineFunction::viewCFG is only available in debug builds on "
408 << "systems with Graphviz or gv!\n";
412 void MachineFunction::viewCFGOnly() const
415 ViewGraph(this, "mf" + getName(), true);
417 errs() << "MachineFunction::viewCFGOnly is only available in debug builds on "
418 << "systems with Graphviz or gv!\n";
422 /// addLiveIn - Add the specified physical register as a live-in value and
423 /// create a corresponding virtual register for it.
424 unsigned MachineFunction::addLiveIn(unsigned PReg,
425 const TargetRegisterClass *RC) {
426 MachineRegisterInfo &MRI = getRegInfo();
427 unsigned VReg = MRI.getLiveInVirtReg(PReg);
429 assert(MRI.getRegClass(VReg) == RC && "Register class mismatch!");
432 VReg = MRI.createVirtualRegister(RC);
433 MRI.addLiveIn(PReg, VReg);
437 /// getJTISymbol - Return the MCSymbol for the specified non-empty jump table.
438 /// If isLinkerPrivate is specified, an 'l' label is returned, otherwise a
439 /// normal 'L' label is returned.
440 MCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx,
441 bool isLinkerPrivate) const {
442 assert(JumpTableInfo && "No jump tables");
443 assert(JTI < JumpTableInfo->getJumpTables().size() && "Invalid JTI!");
444 const MCAsmInfo &MAI = *getTarget().getMCAsmInfo();
446 const char *Prefix = isLinkerPrivate ? MAI.getLinkerPrivateGlobalPrefix() :
447 MAI.getPrivateGlobalPrefix();
448 SmallString<60> Name;
449 raw_svector_ostream(Name)
450 << Prefix << "JTI" << getFunctionNumber() << '_' << JTI;
451 return Ctx.GetOrCreateSymbol(Name.str());
454 /// getPICBaseSymbol - Return a function-local symbol to represent the PIC
456 MCSymbol *MachineFunction::getPICBaseSymbol() const {
457 const MCAsmInfo &MAI = *Target.getMCAsmInfo();
458 return Ctx.GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix())+
459 Twine(getFunctionNumber())+"$pb");
462 //===----------------------------------------------------------------------===//
463 // MachineFrameInfo implementation
464 //===----------------------------------------------------------------------===//
466 /// ensureMaxAlignment - Make sure the function is at least Align bytes
468 void MachineFrameInfo::ensureMaxAlignment(unsigned Align) {
469 if (!TFI.isStackRealignable() || !RealignOption)
470 assert(Align <= TFI.getStackAlignment() &&
471 "For targets without stack realignment, Align is out of limit!");
472 if (MaxAlignment < Align) MaxAlignment = Align;
475 /// clampStackAlignment - Clamp the alignment if requested and emit a warning.
476 static inline unsigned clampStackAlignment(bool ShouldClamp, unsigned Align,
477 unsigned StackAlign) {
478 if (!ShouldClamp || Align <= StackAlign)
480 DEBUG(dbgs() << "Warning: requested alignment " << Align
481 << " exceeds the stack alignment " << StackAlign
482 << " when stack realignment is off" << '\n');
486 /// CreateStackObject - Create a new statically sized stack object, returning
487 /// a nonnegative identifier to represent it.
489 int MachineFrameInfo::CreateStackObject(uint64_t Size, unsigned Alignment,
490 bool isSS, bool MayNeedSP, const AllocaInst *Alloca) {
491 assert(Size != 0 && "Cannot allocate zero size stack objects!");
492 Alignment = clampStackAlignment(!TFI.isStackRealignable() || !RealignOption,
493 Alignment, TFI.getStackAlignment());
494 Objects.push_back(StackObject(Size, Alignment, 0, false, isSS, MayNeedSP,
496 int Index = (int)Objects.size() - NumFixedObjects - 1;
497 assert(Index >= 0 && "Bad frame index!");
498 ensureMaxAlignment(Alignment);
502 /// CreateSpillStackObject - Create a new statically sized stack object that
503 /// represents a spill slot, returning a nonnegative identifier to represent
506 int MachineFrameInfo::CreateSpillStackObject(uint64_t Size,
507 unsigned Alignment) {
508 Alignment = clampStackAlignment(!TFI.isStackRealignable() || !RealignOption,
509 Alignment, TFI.getStackAlignment());
510 CreateStackObject(Size, Alignment, true, false);
511 int Index = (int)Objects.size() - NumFixedObjects - 1;
512 ensureMaxAlignment(Alignment);
516 /// CreateVariableSizedObject - Notify the MachineFrameInfo object that a
517 /// variable sized object has been created. This must be created whenever a
518 /// variable sized object is created, whether or not the index returned is
521 int MachineFrameInfo::CreateVariableSizedObject(unsigned Alignment) {
522 HasVarSizedObjects = true;
523 Alignment = clampStackAlignment(!TFI.isStackRealignable() || !RealignOption,
524 Alignment, TFI.getStackAlignment());
525 Objects.push_back(StackObject(0, Alignment, 0, false, false, true, 0));
526 ensureMaxAlignment(Alignment);
527 return (int)Objects.size()-NumFixedObjects-1;
530 /// CreateFixedObject - Create a new object at a fixed location on the stack.
531 /// All fixed objects should be created before other objects are created for
532 /// efficiency. By default, fixed objects are immutable. This returns an
533 /// index with a negative value.
535 int MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset,
537 assert(Size != 0 && "Cannot allocate zero size fixed stack objects!");
538 // The alignment of the frame index can be determined from its offset from
539 // the incoming frame position. If the frame object is at offset 32 and
540 // the stack is guaranteed to be 16-byte aligned, then we know that the
541 // object is 16-byte aligned.
542 unsigned StackAlign = TFI.getStackAlignment();
543 unsigned Align = MinAlign(SPOffset, StackAlign);
544 Align = clampStackAlignment(!TFI.isStackRealignable() || !RealignOption,
545 Align, TFI.getStackAlignment());
546 Objects.insert(Objects.begin(), StackObject(Size, Align, SPOffset, Immutable,
550 return -++NumFixedObjects;
555 MachineFrameInfo::getPristineRegs(const MachineBasicBlock *MBB) const {
556 assert(MBB && "MBB must be valid");
557 const MachineFunction *MF = MBB->getParent();
558 assert(MF && "MBB must be part of a MachineFunction");
559 const TargetMachine &TM = MF->getTarget();
560 const TargetRegisterInfo *TRI = TM.getRegisterInfo();
561 BitVector BV(TRI->getNumRegs());
563 // Before CSI is calculated, no registers are considered pristine. They can be
564 // freely used and PEI will make sure they are saved.
565 if (!isCalleeSavedInfoValid())
568 for (const uint16_t *CSR = TRI->getCalleeSavedRegs(MF); CSR && *CSR; ++CSR)
571 // The entry MBB always has all CSRs pristine.
572 if (MBB == &MF->front())
575 // On other MBBs the saved CSRs are not pristine.
576 const std::vector<CalleeSavedInfo> &CSI = getCalleeSavedInfo();
577 for (std::vector<CalleeSavedInfo>::const_iterator I = CSI.begin(),
578 E = CSI.end(); I != E; ++I)
579 BV.reset(I->getReg());
585 void MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{
586 if (Objects.empty()) return;
588 const TargetFrameLowering *FI = MF.getTarget().getFrameLowering();
589 int ValOffset = (FI ? FI->getOffsetOfLocalArea() : 0);
591 OS << "Frame Objects:\n";
593 for (unsigned i = 0, e = Objects.size(); i != e; ++i) {
594 const StackObject &SO = Objects[i];
595 OS << " fi#" << (int)(i-NumFixedObjects) << ": ";
596 if (SO.Size == ~0ULL) {
601 OS << "variable sized";
603 OS << "size=" << SO.Size;
604 OS << ", align=" << SO.Alignment;
606 if (i < NumFixedObjects)
608 if (i < NumFixedObjects || SO.SPOffset != -1) {
609 int64_t Off = SO.SPOffset - ValOffset;
610 OS << ", at location [SP";
621 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
622 void MachineFrameInfo::dump(const MachineFunction &MF) const {
627 //===----------------------------------------------------------------------===//
628 // MachineJumpTableInfo implementation
629 //===----------------------------------------------------------------------===//
631 /// getEntrySize - Return the size of each entry in the jump table.
632 unsigned MachineJumpTableInfo::getEntrySize(const DataLayout &TD) const {
633 // The size of a jump table entry is 4 bytes unless the entry is just the
634 // address of a block, in which case it is the pointer size.
635 switch (getEntryKind()) {
636 case MachineJumpTableInfo::EK_BlockAddress:
637 return TD.getPointerSize();
638 case MachineJumpTableInfo::EK_GPRel64BlockAddress:
640 case MachineJumpTableInfo::EK_GPRel32BlockAddress:
641 case MachineJumpTableInfo::EK_LabelDifference32:
642 case MachineJumpTableInfo::EK_Custom32:
644 case MachineJumpTableInfo::EK_Inline:
647 llvm_unreachable("Unknown jump table encoding!");
650 /// getEntryAlignment - Return the alignment of each entry in the jump table.
651 unsigned MachineJumpTableInfo::getEntryAlignment(const DataLayout &TD) const {
652 // The alignment of a jump table entry is the alignment of int32 unless the
653 // entry is just the address of a block, in which case it is the pointer
655 switch (getEntryKind()) {
656 case MachineJumpTableInfo::EK_BlockAddress:
657 return TD.getPointerABIAlignment();
658 case MachineJumpTableInfo::EK_GPRel64BlockAddress:
659 return TD.getABIIntegerTypeAlignment(64);
660 case MachineJumpTableInfo::EK_GPRel32BlockAddress:
661 case MachineJumpTableInfo::EK_LabelDifference32:
662 case MachineJumpTableInfo::EK_Custom32:
663 return TD.getABIIntegerTypeAlignment(32);
664 case MachineJumpTableInfo::EK_Inline:
667 llvm_unreachable("Unknown jump table encoding!");
670 /// createJumpTableIndex - Create a new jump table entry in the jump table info.
672 unsigned MachineJumpTableInfo::createJumpTableIndex(
673 const std::vector<MachineBasicBlock*> &DestBBs) {
674 assert(!DestBBs.empty() && "Cannot create an empty jump table!");
675 JumpTables.push_back(MachineJumpTableEntry(DestBBs));
676 return JumpTables.size()-1;
679 /// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update
680 /// the jump tables to branch to New instead.
681 bool MachineJumpTableInfo::ReplaceMBBInJumpTables(MachineBasicBlock *Old,
682 MachineBasicBlock *New) {
683 assert(Old != New && "Not making a change?");
684 bool MadeChange = false;
685 for (size_t i = 0, e = JumpTables.size(); i != e; ++i)
686 ReplaceMBBInJumpTable(i, Old, New);
690 /// ReplaceMBBInJumpTable - If Old is a target of the jump tables, update
691 /// the jump table to branch to New instead.
692 bool MachineJumpTableInfo::ReplaceMBBInJumpTable(unsigned Idx,
693 MachineBasicBlock *Old,
694 MachineBasicBlock *New) {
695 assert(Old != New && "Not making a change?");
696 bool MadeChange = false;
697 MachineJumpTableEntry &JTE = JumpTables[Idx];
698 for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j)
699 if (JTE.MBBs[j] == Old) {
706 void MachineJumpTableInfo::print(raw_ostream &OS) const {
707 if (JumpTables.empty()) return;
709 OS << "Jump Tables:\n";
711 for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) {
712 OS << " jt#" << i << ": ";
713 for (unsigned j = 0, f = JumpTables[i].MBBs.size(); j != f; ++j)
714 OS << " BB#" << JumpTables[i].MBBs[j]->getNumber();
720 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
721 void MachineJumpTableInfo::dump() const { print(dbgs()); }
725 //===----------------------------------------------------------------------===//
726 // MachineConstantPool implementation
727 //===----------------------------------------------------------------------===//
729 void MachineConstantPoolValue::anchor() { }
731 Type *MachineConstantPoolEntry::getType() const {
732 if (isMachineConstantPoolEntry())
733 return Val.MachineCPVal->getType();
734 return Val.ConstVal->getType();
738 unsigned MachineConstantPoolEntry::getRelocationInfo() const {
739 if (isMachineConstantPoolEntry())
740 return Val.MachineCPVal->getRelocationInfo();
741 return Val.ConstVal->getRelocationInfo();
744 MachineConstantPool::~MachineConstantPool() {
745 for (unsigned i = 0, e = Constants.size(); i != e; ++i)
746 if (Constants[i].isMachineConstantPoolEntry())
747 delete Constants[i].Val.MachineCPVal;
748 for (DenseSet<MachineConstantPoolValue*>::iterator I =
749 MachineCPVsSharingEntries.begin(), E = MachineCPVsSharingEntries.end();
754 /// CanShareConstantPoolEntry - Test whether the given two constants
755 /// can be allocated the same constant pool entry.
756 static bool CanShareConstantPoolEntry(const Constant *A, const Constant *B,
757 const DataLayout *TD) {
758 // Handle the trivial case quickly.
759 if (A == B) return true;
761 // If they have the same type but weren't the same constant, quickly
763 if (A->getType() == B->getType()) return false;
765 // We can't handle structs or arrays.
766 if (isa<StructType>(A->getType()) || isa<ArrayType>(A->getType()) ||
767 isa<StructType>(B->getType()) || isa<ArrayType>(B->getType()))
770 // For now, only support constants with the same size.
771 uint64_t StoreSize = TD->getTypeStoreSize(A->getType());
772 if (StoreSize != TD->getTypeStoreSize(B->getType()) ||
776 Type *IntTy = IntegerType::get(A->getContext(), StoreSize*8);
778 // Try constant folding a bitcast of both instructions to an integer. If we
779 // get two identical ConstantInt's, then we are good to share them. We use
780 // the constant folding APIs to do this so that we get the benefit of
782 if (isa<PointerType>(A->getType()))
783 A = ConstantFoldInstOperands(Instruction::PtrToInt, IntTy,
784 const_cast<Constant*>(A), TD);
785 else if (A->getType() != IntTy)
786 A = ConstantFoldInstOperands(Instruction::BitCast, IntTy,
787 const_cast<Constant*>(A), TD);
788 if (isa<PointerType>(B->getType()))
789 B = ConstantFoldInstOperands(Instruction::PtrToInt, IntTy,
790 const_cast<Constant*>(B), TD);
791 else if (B->getType() != IntTy)
792 B = ConstantFoldInstOperands(Instruction::BitCast, IntTy,
793 const_cast<Constant*>(B), TD);
798 /// getConstantPoolIndex - Create a new entry in the constant pool or return
799 /// an existing one. User must specify the log2 of the minimum required
800 /// alignment for the object.
802 unsigned MachineConstantPool::getConstantPoolIndex(const Constant *C,
803 unsigned Alignment) {
804 assert(Alignment && "Alignment must be specified!");
805 if (Alignment > PoolAlignment) PoolAlignment = Alignment;
807 // Check to see if we already have this constant.
809 // FIXME, this could be made much more efficient for large constant pools.
810 for (unsigned i = 0, e = Constants.size(); i != e; ++i)
811 if (!Constants[i].isMachineConstantPoolEntry() &&
812 CanShareConstantPoolEntry(Constants[i].Val.ConstVal, C, TD)) {
813 if ((unsigned)Constants[i].getAlignment() < Alignment)
814 Constants[i].Alignment = Alignment;
818 Constants.push_back(MachineConstantPoolEntry(C, Alignment));
819 return Constants.size()-1;
822 unsigned MachineConstantPool::getConstantPoolIndex(MachineConstantPoolValue *V,
823 unsigned Alignment) {
824 assert(Alignment && "Alignment must be specified!");
825 if (Alignment > PoolAlignment) PoolAlignment = Alignment;
827 // Check to see if we already have this constant.
829 // FIXME, this could be made much more efficient for large constant pools.
830 int Idx = V->getExistingMachineCPValue(this, Alignment);
832 MachineCPVsSharingEntries.insert(V);
833 return (unsigned)Idx;
836 Constants.push_back(MachineConstantPoolEntry(V, Alignment));
837 return Constants.size()-1;
840 void MachineConstantPool::print(raw_ostream &OS) const {
841 if (Constants.empty()) return;
843 OS << "Constant Pool:\n";
844 for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
845 OS << " cp#" << i << ": ";
846 if (Constants[i].isMachineConstantPoolEntry())
847 Constants[i].Val.MachineCPVal->print(OS);
849 OS << *(const Value*)Constants[i].Val.ConstVal;
850 OS << ", align=" << Constants[i].getAlignment();
855 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
856 void MachineConstantPool::dump() const { print(dbgs()); }