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/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"
43 //===----------------------------------------------------------------------===//
44 // MachineFunction implementation
45 //===----------------------------------------------------------------------===//
47 // Out of line virtual method.
48 MachineFunctionInfo::~MachineFunctionInfo() {}
50 void ilist_traits<MachineBasicBlock>::deleteNode(MachineBasicBlock *MBB) {
51 MBB->getParent()->DeleteMachineBasicBlock(MBB);
54 MachineFunction::MachineFunction(const Function *F, const TargetMachine &TM,
55 unsigned FunctionNum, MachineModuleInfo &mmi,
57 : Fn(F), Target(TM), Ctx(mmi.getContext()), MMI(mmi), GMI(gmi) {
58 if (TM.getRegisterInfo())
59 RegInfo = new (Allocator) MachineRegisterInfo(*TM.getRegisterInfo());
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;
73 MachineFunction::~MachineFunction() {
75 InstructionRecycler.clear(Allocator);
76 BasicBlockRecycler.clear(Allocator);
78 RegInfo->~MachineRegisterInfo();
79 Allocator.Deallocate(RegInfo);
82 MFInfo->~MachineFunctionInfo();
83 Allocator.Deallocate(MFInfo);
85 FrameInfo->~MachineFrameInfo(); Allocator.Deallocate(FrameInfo);
86 ConstantPool->~MachineConstantPool(); Allocator.Deallocate(ConstantPool);
89 JumpTableInfo->~MachineJumpTableInfo();
90 Allocator.Deallocate(JumpTableInfo);
94 /// getOrCreateJumpTableInfo - Get the JumpTableInfo for this function, if it
95 /// does already exist, allocate one.
96 MachineJumpTableInfo *MachineFunction::
97 getOrCreateJumpTableInfo(unsigned EntryKind) {
98 if (JumpTableInfo) return JumpTableInfo;
100 JumpTableInfo = new (Allocator)
101 MachineJumpTableInfo((MachineJumpTableInfo::JTEntryKind)EntryKind);
102 return JumpTableInfo;
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.
110 void MachineFunction::RenumberBlocks(MachineBasicBlock *MBB) {
111 if (empty()) { MBBNumbering.clear(); return; }
112 MachineFunction::iterator MBBI, E = end();
118 // Figure out the block number this should have.
119 unsigned BlockNo = 0;
121 BlockNo = prior(MBBI)->getNumber()+1;
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;
132 // If BlockNo is already taken, set that block's number to -1.
133 if (MBBNumbering[BlockNo])
134 MBBNumbering[BlockNo]->setNumber(-1);
136 MBBNumbering[BlockNo] = MBBI;
137 MBBI->setNumber(BlockNo);
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);
147 /// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
148 /// of `new MachineInstr'.
151 MachineFunction::CreateMachineInstr(const TargetInstrDesc &TID,
152 DebugLoc DL, bool NoImp) {
153 return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
154 MachineInstr(TID, DL, NoImp);
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.
162 MachineFunction::CloneMachineInstr(const MachineInstr *Orig) {
163 return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
164 MachineInstr(*this, *Orig);
167 /// DeleteMachineInstr - Delete the given MachineInstr.
170 MachineFunction::DeleteMachineInstr(MachineInstr *MI) {
172 InstructionRecycler.Deallocate(Allocator, MI);
175 /// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
176 /// instead of `new MachineBasicBlock'.
179 MachineFunction::CreateMachineBasicBlock(const BasicBlock *bb) {
180 return new (BasicBlockRecycler.Allocate<MachineBasicBlock>(Allocator))
181 MachineBasicBlock(*this, bb);
184 /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
187 MachineFunction::DeleteMachineBasicBlock(MachineBasicBlock *MBB) {
188 assert(MBB->getParent() == this && "MBB parent mismatch!");
189 MBB->~MachineBasicBlock();
190 BasicBlockRecycler.Deallocate(Allocator, MBB);
194 MachineFunction::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,
202 MachineFunction::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);
211 MachineInstr::mmo_iterator
212 MachineFunction::allocateMemRefsArray(unsigned long Num) {
213 return Allocator.Allocate<MachineMemOperand *>(Num);
216 std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator>
217 MachineFunction::extractLoadMemRefs(MachineInstr::mmo_iterator Begin,
218 MachineInstr::mmo_iterator End) {
219 // Count the number of load mem refs.
221 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I)
225 // Allocate a new array and populate it with the load information.
226 MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num);
228 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) {
229 if ((*I)->isLoad()) {
230 if (!(*I)->isStore())
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;
245 return std::make_pair(Result, Result + Num);
248 std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator>
249 MachineFunction::extractStoreMemRefs(MachineInstr::mmo_iterator Begin,
250 MachineInstr::mmo_iterator End) {
251 // Count the number of load mem refs.
253 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I)
257 // Allocate a new array and populate it with the store information.
258 MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num);
260 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) {
261 if ((*I)->isStore()) {
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;
277 return std::make_pair(Result, Result + Num);
280 void MachineFunction::dump() const {
284 void MachineFunction::print(raw_ostream &OS, SlotIndexes *Indexes) const {
285 OS << "# Machine code for function " << Fn->getName() << ":\n";
287 // Print Frame Information
288 FrameInfo->print(*this, OS);
290 // Print JumpTable Information
292 JumpTableInfo->print(OS);
294 // Print Constant Pool
295 ConstantPool->print(OS);
297 const TargetRegisterInfo *TRI = getTarget().getRegisterInfo();
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);
305 OS << " in " << PrintReg(I->second, TRI);
306 if (llvm::next(I) != E)
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);
319 for (const_iterator BB = begin(), E = end(); BB != E; ++BB) {
321 BB->print(OS, Indexes);
324 OS << "\n# End machine code for function " << Fn->getName() << ".\n\n";
329 struct DOTGraphTraits<const MachineFunction*> : public DefaultDOTGraphTraits {
331 DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {}
333 static std::string getGraphName(const MachineFunction *F) {
334 return "CFG for '" + F->getFunction()->getNameStr() + "' function";
337 std::string getNodeLabel(const MachineBasicBlock *Node,
338 const MachineFunction *Graph) {
341 raw_string_ostream OSS(OutStr);
344 OSS << "BB#" << Node->getNumber();
345 if (const BasicBlock *BB = Node->getBasicBlock())
346 OSS << ": " << BB->getName();
351 if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());
353 // Process string output to make it nicer...
354 for (unsigned i = 0; i != OutStr.length(); ++i)
355 if (OutStr[i] == '\n') { // Left justify
357 OutStr.insert(OutStr.begin()+i+1, 'l');
364 void MachineFunction::viewCFG() const
367 ViewGraph(this, "mf" + getFunction()->getNameStr());
369 errs() << "MachineFunction::viewCFG is only available in debug builds on "
370 << "systems with Graphviz or gv!\n";
374 void MachineFunction::viewCFGOnly() const
377 ViewGraph(this, "mf" + getFunction()->getNameStr(), true);
379 errs() << "MachineFunction::viewCFGOnly is only available in debug builds on "
380 << "systems with Graphviz or gv!\n";
384 /// addLiveIn - Add the specified physical register as a live-in value and
385 /// create a corresponding virtual register for it.
386 unsigned MachineFunction::addLiveIn(unsigned PReg,
387 const TargetRegisterClass *RC) {
388 MachineRegisterInfo &MRI = getRegInfo();
389 unsigned VReg = MRI.getLiveInVirtReg(PReg);
391 assert(MRI.getRegClass(VReg) == RC && "Register class mismatch!");
394 VReg = MRI.createVirtualRegister(RC);
395 MRI.addLiveIn(PReg, VReg);
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.
402 MCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx,
403 bool isLinkerPrivate) const {
404 assert(JumpTableInfo && "No jump tables");
406 assert(JTI < JumpTableInfo->getJumpTables().size() && "Invalid JTI!");
407 const MCAsmInfo &MAI = *getTarget().getMCAsmInfo();
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());
417 /// getPICBaseSymbol - Return a function-local symbol to represent the PIC
419 MCSymbol *MachineFunction::getPICBaseSymbol() const {
420 const MCAsmInfo &MAI = *Target.getMCAsmInfo();
421 return Ctx.GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix())+
422 Twine(getFunctionNumber())+"$pb");
425 //===----------------------------------------------------------------------===//
426 // MachineFrameInfo implementation
427 //===----------------------------------------------------------------------===//
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.
434 int MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset,
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;
450 MachineFrameInfo::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());
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())
463 for (const unsigned *CSR = TRI->getCalleeSavedRegs(MF); CSR && *CSR; ++CSR)
466 // The entry MBB always has all CSRs pristine.
467 if (MBB == &MF->front())
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());
480 void MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{
481 if (Objects.empty()) return;
483 const TargetFrameLowering *FI = MF.getTarget().getFrameLowering();
484 int ValOffset = (FI ? FI->getOffsetOfLocalArea() : 0);
486 OS << "Frame Objects:\n";
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) {
496 OS << "variable sized";
498 OS << "size=" << SO.Size;
499 OS << ", align=" << SO.Alignment;
501 if (i < NumFixedObjects)
503 if (i < NumFixedObjects || SO.SPOffset != -1) {
504 int64_t Off = SO.SPOffset - ValOffset;
505 OS << ", at location [SP";
516 void MachineFrameInfo::dump(const MachineFunction &MF) const {
520 //===----------------------------------------------------------------------===//
521 // MachineJumpTableInfo implementation
522 //===----------------------------------------------------------------------===//
524 /// getEntrySize - Return the size of each entry in the jump table.
525 unsigned 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:
535 case MachineJumpTableInfo::EK_Inline:
538 assert(0 && "Unknown jump table encoding!");
542 /// getEntryAlignment - Return the alignment of each entry in the jump table.
543 unsigned 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
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:
557 assert(0 && "Unknown jump table encoding!");
561 /// createJumpTableIndex - Create a new jump table entry in the jump table info.
563 unsigned 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;
570 /// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update
571 /// the jump tables to branch to New instead.
572 bool 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);
581 /// ReplaceMBBInJumpTable - If Old is a target of the jump tables, update
582 /// the jump table to branch to New instead.
583 bool 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) {
597 void MachineJumpTableInfo::print(raw_ostream &OS) const {
598 if (JumpTables.empty()) return;
600 OS << "Jump Tables:\n";
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();
611 void MachineJumpTableInfo::dump() const { print(dbgs()); }
614 //===----------------------------------------------------------------------===//
615 // MachineConstantPool implementation
616 //===----------------------------------------------------------------------===//
618 const Type *MachineConstantPoolEntry::getType() const {
619 if (isMachineConstantPoolEntry())
620 return Val.MachineCPVal->getType();
621 return Val.ConstVal->getType();
625 unsigned MachineConstantPoolEntry::getRelocationInfo() const {
626 if (isMachineConstantPoolEntry())
627 return Val.MachineCPVal->getRelocationInfo();
628 return Val.ConstVal->getRelocationInfo();
631 MachineConstantPool::~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();
641 /// CanShareConstantPoolEntry - Test whether the given two constants
642 /// can be allocated the same constant pool entry.
643 static bool CanShareConstantPoolEntry(const Constant *A, const Constant *B,
644 const TargetData *TD) {
645 // Handle the trivial case quickly.
646 if (A == B) return true;
648 // If they have the same type but weren't the same constant, quickly
650 if (A->getType() == B->getType()) return false;
652 // For now, only support constants with the same size.
653 if (TD->getTypeStoreSize(A->getType()) != TD->getTypeStoreSize(B->getType()))
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();
665 // Two vectors can share an entry if each pair of corresponding
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())
671 for (unsigned i = 0, e = AV->getType()->getNumElements(); i != e; ++i)
672 if (!CanShareConstantPoolEntry(AV->getOperand(i),
673 BV->getOperand(i), TD))
678 // TODO: Handle other cases.
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.
687 unsigned MachineConstantPool::getConstantPoolIndex(const Constant *C,
688 unsigned Alignment) {
689 assert(Alignment && "Alignment must be specified!");
690 if (Alignment > PoolAlignment) PoolAlignment = Alignment;
692 // Check to see if we already have this constant.
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;
703 Constants.push_back(MachineConstantPoolEntry(C, Alignment));
704 return Constants.size()-1;
707 unsigned MachineConstantPool::getConstantPoolIndex(MachineConstantPoolValue *V,
708 unsigned Alignment) {
709 assert(Alignment && "Alignment must be specified!");
710 if (Alignment > PoolAlignment) PoolAlignment = Alignment;
712 // Check to see if we already have this constant.
714 // FIXME, this could be made much more efficient for large constant pools.
715 int Idx = V->getExistingMachineCPValue(this, Alignment);
717 MachineCPVsSharingEntries.insert(V);
718 return (unsigned)Idx;
721 Constants.push_back(MachineConstantPoolEntry(V, Alignment));
722 return Constants.size()-1;
725 void MachineConstantPool::print(raw_ostream &OS) const {
726 if (Constants.empty()) return;
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);
734 OS << *(Value*)Constants[i].Val.ConstVal;
735 OS << ", align=" << Constants[i].getAlignment();
740 void MachineConstantPool::dump() const { print(dbgs()); }