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/IR/DataLayout.h"
29 #include "llvm/IR/DebugInfo.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 #define DEBUG_TYPE "codegen"
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);
65 new (Allocator) MachineFrameInfo(TM,!F->hasFnAttribute("no-realign-stack"));
67 if (Fn->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
68 Attribute::StackAlignment))
69 FrameInfo->ensureMaxAlignment(Fn->getAttributes().
70 getStackAlignment(AttributeSet::FunctionIndex));
72 ConstantPool = new (Allocator) MachineConstantPool(TM);
73 Alignment = TM.getTargetLowering()->getMinFunctionAlignment();
75 // FIXME: Shouldn't use pref alignment if explicit alignment is set on Fn.
76 if (!Fn->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
77 Attribute::OptimizeForSize))
78 Alignment = std::max(Alignment,
79 TM.getTargetLowering()->getPrefFunctionAlignment());
81 FunctionNumber = FunctionNum;
82 JumpTableInfo = nullptr;
85 MachineFunction::~MachineFunction() {
86 // Don't call destructors on MachineInstr and MachineOperand. All of their
87 // memory comes from the BumpPtrAllocator which is about to be purged.
89 // Do call MachineBasicBlock destructors, it contains std::vectors.
90 for (iterator I = begin(), E = end(); I != E; I = BasicBlocks.erase(I))
91 I->Insts.clearAndLeakNodesUnsafely();
93 InstructionRecycler.clear(Allocator);
94 OperandRecycler.clear(Allocator);
95 BasicBlockRecycler.clear(Allocator);
97 RegInfo->~MachineRegisterInfo();
98 Allocator.Deallocate(RegInfo);
101 MFInfo->~MachineFunctionInfo();
102 Allocator.Deallocate(MFInfo);
105 FrameInfo->~MachineFrameInfo();
106 Allocator.Deallocate(FrameInfo);
108 ConstantPool->~MachineConstantPool();
109 Allocator.Deallocate(ConstantPool);
112 JumpTableInfo->~MachineJumpTableInfo();
113 Allocator.Deallocate(JumpTableInfo);
117 /// getOrCreateJumpTableInfo - Get the JumpTableInfo for this function, if it
118 /// does already exist, allocate one.
119 MachineJumpTableInfo *MachineFunction::
120 getOrCreateJumpTableInfo(unsigned EntryKind) {
121 if (JumpTableInfo) return JumpTableInfo;
123 JumpTableInfo = new (Allocator)
124 MachineJumpTableInfo((MachineJumpTableInfo::JTEntryKind)EntryKind);
125 return JumpTableInfo;
128 /// Should we be emitting segmented stack stuff for the function
129 bool MachineFunction::shouldSplitStack() {
130 return getFunction()->hasFnAttribute("split-stack");
133 /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
134 /// recomputes them. This guarantees that the MBB numbers are sequential,
135 /// dense, and match the ordering of the blocks within the function. If a
136 /// specific MachineBasicBlock is specified, only that block and those after
137 /// it are renumbered.
138 void MachineFunction::RenumberBlocks(MachineBasicBlock *MBB) {
139 if (empty()) { MBBNumbering.clear(); return; }
140 MachineFunction::iterator MBBI, E = end();
146 // Figure out the block number this should have.
147 unsigned BlockNo = 0;
149 BlockNo = std::prev(MBBI)->getNumber() + 1;
151 for (; MBBI != E; ++MBBI, ++BlockNo) {
152 if (MBBI->getNumber() != (int)BlockNo) {
153 // Remove use of the old number.
154 if (MBBI->getNumber() != -1) {
155 assert(MBBNumbering[MBBI->getNumber()] == &*MBBI &&
156 "MBB number mismatch!");
157 MBBNumbering[MBBI->getNumber()] = nullptr;
160 // If BlockNo is already taken, set that block's number to -1.
161 if (MBBNumbering[BlockNo])
162 MBBNumbering[BlockNo]->setNumber(-1);
164 MBBNumbering[BlockNo] = MBBI;
165 MBBI->setNumber(BlockNo);
169 // Okay, all the blocks are renumbered. If we have compactified the block
170 // numbering, shrink MBBNumbering now.
171 assert(BlockNo <= MBBNumbering.size() && "Mismatch!");
172 MBBNumbering.resize(BlockNo);
175 /// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
176 /// of `new MachineInstr'.
179 MachineFunction::CreateMachineInstr(const MCInstrDesc &MCID,
180 DebugLoc DL, bool NoImp) {
181 return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
182 MachineInstr(*this, MCID, DL, NoImp);
185 /// CloneMachineInstr - Create a new MachineInstr which is a copy of the
186 /// 'Orig' instruction, identical in all ways except the instruction
187 /// has no parent, prev, or next.
190 MachineFunction::CloneMachineInstr(const MachineInstr *Orig) {
191 return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
192 MachineInstr(*this, *Orig);
195 /// DeleteMachineInstr - Delete the given MachineInstr.
197 /// This function also serves as the MachineInstr destructor - the real
198 /// ~MachineInstr() destructor must be empty.
200 MachineFunction::DeleteMachineInstr(MachineInstr *MI) {
201 // Strip it for parts. The operand array and the MI object itself are
202 // independently recyclable.
204 deallocateOperandArray(MI->CapOperands, MI->Operands);
205 // Don't call ~MachineInstr() which must be trivial anyway because
206 // ~MachineFunction drops whole lists of MachineInstrs wihout calling their
208 InstructionRecycler.Deallocate(Allocator, MI);
211 /// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
212 /// instead of `new MachineBasicBlock'.
215 MachineFunction::CreateMachineBasicBlock(const BasicBlock *bb) {
216 return new (BasicBlockRecycler.Allocate<MachineBasicBlock>(Allocator))
217 MachineBasicBlock(*this, bb);
220 /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
223 MachineFunction::DeleteMachineBasicBlock(MachineBasicBlock *MBB) {
224 assert(MBB->getParent() == this && "MBB parent mismatch!");
225 MBB->~MachineBasicBlock();
226 BasicBlockRecycler.Deallocate(Allocator, MBB);
230 MachineFunction::getMachineMemOperand(MachinePointerInfo PtrInfo, unsigned f,
231 uint64_t s, unsigned base_alignment,
232 const MDNode *TBAAInfo,
233 const MDNode *Ranges) {
234 return new (Allocator) MachineMemOperand(PtrInfo, f, s, base_alignment,
239 MachineFunction::getMachineMemOperand(const MachineMemOperand *MMO,
240 int64_t Offset, uint64_t Size) {
242 return new (Allocator)
243 MachineMemOperand(MachinePointerInfo(MMO->getValue(),
244 MMO->getOffset()+Offset),
245 MMO->getFlags(), Size,
246 MMO->getBaseAlignment(), nullptr);
247 return new (Allocator)
248 MachineMemOperand(MachinePointerInfo(MMO->getPseudoValue(),
249 MMO->getOffset()+Offset),
250 MMO->getFlags(), Size,
251 MMO->getBaseAlignment(), nullptr);
254 MachineInstr::mmo_iterator
255 MachineFunction::allocateMemRefsArray(unsigned long Num) {
256 return Allocator.Allocate<MachineMemOperand *>(Num);
259 std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator>
260 MachineFunction::extractLoadMemRefs(MachineInstr::mmo_iterator Begin,
261 MachineInstr::mmo_iterator End) {
262 // Count the number of load mem refs.
264 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I)
268 // Allocate a new array and populate it with the load information.
269 MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num);
271 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) {
272 if ((*I)->isLoad()) {
273 if (!(*I)->isStore())
277 // Clone the MMO and unset the store flag.
278 MachineMemOperand *JustLoad =
279 getMachineMemOperand((*I)->getPointerInfo(),
280 (*I)->getFlags() & ~MachineMemOperand::MOStore,
281 (*I)->getSize(), (*I)->getBaseAlignment(),
282 (*I)->getTBAAInfo());
283 Result[Index] = JustLoad;
288 return std::make_pair(Result, Result + Num);
291 std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator>
292 MachineFunction::extractStoreMemRefs(MachineInstr::mmo_iterator Begin,
293 MachineInstr::mmo_iterator End) {
294 // Count the number of load mem refs.
296 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I)
300 // Allocate a new array and populate it with the store information.
301 MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num);
303 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) {
304 if ((*I)->isStore()) {
309 // Clone the MMO and unset the load flag.
310 MachineMemOperand *JustStore =
311 getMachineMemOperand((*I)->getPointerInfo(),
312 (*I)->getFlags() & ~MachineMemOperand::MOLoad,
313 (*I)->getSize(), (*I)->getBaseAlignment(),
314 (*I)->getTBAAInfo());
315 Result[Index] = JustStore;
320 return std::make_pair(Result, Result + Num);
323 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
324 void MachineFunction::dump() const {
329 StringRef MachineFunction::getName() const {
330 assert(getFunction() && "No function!");
331 return getFunction()->getName();
334 void MachineFunction::print(raw_ostream &OS, SlotIndexes *Indexes) const {
335 OS << "# Machine code for function " << getName() << ": ";
337 OS << (RegInfo->isSSA() ? "SSA" : "Post SSA");
338 if (!RegInfo->tracksLiveness())
339 OS << ", not tracking liveness";
343 // Print Frame Information
344 FrameInfo->print(*this, OS);
346 // Print JumpTable Information
348 JumpTableInfo->print(OS);
350 // Print Constant Pool
351 ConstantPool->print(OS);
353 const TargetRegisterInfo *TRI = getTarget().getRegisterInfo();
355 if (RegInfo && !RegInfo->livein_empty()) {
356 OS << "Function Live Ins: ";
357 for (MachineRegisterInfo::livein_iterator
358 I = RegInfo->livein_begin(), E = RegInfo->livein_end(); I != E; ++I) {
359 OS << PrintReg(I->first, TRI);
361 OS << " in " << PrintReg(I->second, TRI);
362 if (std::next(I) != E)
368 for (const auto &BB : *this) {
370 BB.print(OS, Indexes);
373 OS << "\n# End machine code for function " << getName() << ".\n\n";
378 struct DOTGraphTraits<const MachineFunction*> : public DefaultDOTGraphTraits {
380 DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {}
382 static std::string getGraphName(const MachineFunction *F) {
383 return "CFG for '" + F->getName().str() + "' function";
386 std::string getNodeLabel(const MachineBasicBlock *Node,
387 const MachineFunction *Graph) {
390 raw_string_ostream OSS(OutStr);
393 OSS << "BB#" << Node->getNumber();
394 if (const BasicBlock *BB = Node->getBasicBlock())
395 OSS << ": " << BB->getName();
400 if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());
402 // Process string output to make it nicer...
403 for (unsigned i = 0; i != OutStr.length(); ++i)
404 if (OutStr[i] == '\n') { // Left justify
406 OutStr.insert(OutStr.begin()+i+1, 'l');
413 void MachineFunction::viewCFG() const
416 ViewGraph(this, "mf" + getName());
418 errs() << "MachineFunction::viewCFG is only available in debug builds on "
419 << "systems with Graphviz or gv!\n";
423 void MachineFunction::viewCFGOnly() const
426 ViewGraph(this, "mf" + getName(), true);
428 errs() << "MachineFunction::viewCFGOnly is only available in debug builds on "
429 << "systems with Graphviz or gv!\n";
433 /// addLiveIn - Add the specified physical register as a live-in value and
434 /// create a corresponding virtual register for it.
435 unsigned MachineFunction::addLiveIn(unsigned PReg,
436 const TargetRegisterClass *RC) {
437 MachineRegisterInfo &MRI = getRegInfo();
438 unsigned VReg = MRI.getLiveInVirtReg(PReg);
440 const TargetRegisterClass *VRegRC = MRI.getRegClass(VReg);
442 // A physical register can be added several times.
443 // Between two calls, the register class of the related virtual register
444 // may have been constrained to match some operation constraints.
445 // In that case, check that the current register class includes the
446 // physical register and is a sub class of the specified RC.
447 assert((VRegRC == RC || (VRegRC->contains(PReg) &&
448 RC->hasSubClassEq(VRegRC))) &&
449 "Register class mismatch!");
452 VReg = MRI.createVirtualRegister(RC);
453 MRI.addLiveIn(PReg, VReg);
457 /// getJTISymbol - Return the MCSymbol for the specified non-empty jump table.
458 /// If isLinkerPrivate is specified, an 'l' label is returned, otherwise a
459 /// normal 'L' label is returned.
460 MCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx,
461 bool isLinkerPrivate) const {
462 const DataLayout *DL = getTarget().getDataLayout();
463 assert(JumpTableInfo && "No jump tables");
464 assert(JTI < JumpTableInfo->getJumpTables().size() && "Invalid JTI!");
466 const char *Prefix = isLinkerPrivate ? DL->getLinkerPrivateGlobalPrefix() :
467 DL->getPrivateGlobalPrefix();
468 SmallString<60> Name;
469 raw_svector_ostream(Name)
470 << Prefix << "JTI" << getFunctionNumber() << '_' << JTI;
471 return Ctx.GetOrCreateSymbol(Name.str());
474 /// getPICBaseSymbol - Return a function-local symbol to represent the PIC
476 MCSymbol *MachineFunction::getPICBaseSymbol() const {
477 const DataLayout *DL = getTarget().getDataLayout();
478 return Ctx.GetOrCreateSymbol(Twine(DL->getPrivateGlobalPrefix())+
479 Twine(getFunctionNumber())+"$pb");
482 //===----------------------------------------------------------------------===//
483 // MachineFrameInfo implementation
484 //===----------------------------------------------------------------------===//
486 const TargetFrameLowering *MachineFrameInfo::getFrameLowering() const {
487 return TM.getFrameLowering();
490 /// ensureMaxAlignment - Make sure the function is at least Align bytes
492 void MachineFrameInfo::ensureMaxAlignment(unsigned Align) {
493 if (!getFrameLowering()->isStackRealignable() || !RealignOption)
494 assert(Align <= getFrameLowering()->getStackAlignment() &&
495 "For targets without stack realignment, Align is out of limit!");
496 if (MaxAlignment < Align) MaxAlignment = Align;
499 /// clampStackAlignment - Clamp the alignment if requested and emit a warning.
500 static inline unsigned clampStackAlignment(bool ShouldClamp, unsigned Align,
501 unsigned StackAlign) {
502 if (!ShouldClamp || Align <= StackAlign)
504 DEBUG(dbgs() << "Warning: requested alignment " << Align
505 << " exceeds the stack alignment " << StackAlign
506 << " when stack realignment is off" << '\n');
510 /// CreateStackObject - Create a new statically sized stack object, returning
511 /// a nonnegative identifier to represent it.
513 int MachineFrameInfo::CreateStackObject(uint64_t Size, unsigned Alignment,
514 bool isSS, const AllocaInst *Alloca) {
515 assert(Size != 0 && "Cannot allocate zero size stack objects!");
517 clampStackAlignment(!getFrameLowering()->isStackRealignable() ||
519 Alignment, getFrameLowering()->getStackAlignment());
520 Objects.push_back(StackObject(Size, Alignment, 0, false, isSS, Alloca));
521 int Index = (int)Objects.size() - NumFixedObjects - 1;
522 assert(Index >= 0 && "Bad frame index!");
523 ensureMaxAlignment(Alignment);
527 /// CreateSpillStackObject - Create a new statically sized stack object that
528 /// represents a spill slot, returning a nonnegative identifier to represent
531 int MachineFrameInfo::CreateSpillStackObject(uint64_t Size,
532 unsigned Alignment) {
533 Alignment = clampStackAlignment(
534 !getFrameLowering()->isStackRealignable() || !RealignOption, Alignment,
535 getFrameLowering()->getStackAlignment());
536 CreateStackObject(Size, Alignment, true);
537 int Index = (int)Objects.size() - NumFixedObjects - 1;
538 ensureMaxAlignment(Alignment);
542 /// CreateVariableSizedObject - Notify the MachineFrameInfo object that a
543 /// variable sized object has been created. This must be created whenever a
544 /// variable sized object is created, whether or not the index returned is
547 int MachineFrameInfo::CreateVariableSizedObject(unsigned Alignment,
548 const AllocaInst *Alloca) {
549 HasVarSizedObjects = true;
550 Alignment = clampStackAlignment(
551 !getFrameLowering()->isStackRealignable() || !RealignOption, Alignment,
552 getFrameLowering()->getStackAlignment());
553 Objects.push_back(StackObject(0, Alignment, 0, false, false, Alloca));
554 ensureMaxAlignment(Alignment);
555 return (int)Objects.size()-NumFixedObjects-1;
558 /// CreateFixedObject - Create a new object at a fixed location on the stack.
559 /// All fixed objects should be created before other objects are created for
560 /// efficiency. By default, fixed objects are immutable. This returns an
561 /// index with a negative value.
563 int MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset,
565 assert(Size != 0 && "Cannot allocate zero size fixed stack objects!");
566 // The alignment of the frame index can be determined from its offset from
567 // the incoming frame position. If the frame object is at offset 32 and
568 // the stack is guaranteed to be 16-byte aligned, then we know that the
569 // object is 16-byte aligned.
570 unsigned StackAlign = getFrameLowering()->getStackAlignment();
571 unsigned Align = MinAlign(SPOffset, StackAlign);
572 Align = clampStackAlignment(!getFrameLowering()->isStackRealignable() ||
574 Align, getFrameLowering()->getStackAlignment());
575 Objects.insert(Objects.begin(), StackObject(Size, Align, SPOffset, Immutable,
577 /*Alloca*/ nullptr));
578 return -++NumFixedObjects;
581 /// CreateFixedSpillStackObject - Create a spill slot at a fixed location
582 /// on the stack. Returns an index with a negative value.
583 int MachineFrameInfo::CreateFixedSpillStackObject(uint64_t Size,
585 unsigned StackAlign = getFrameLowering()->getStackAlignment();
586 unsigned Align = MinAlign(SPOffset, StackAlign);
587 Align = clampStackAlignment(!getFrameLowering()->isStackRealignable() ||
589 Align, getFrameLowering()->getStackAlignment());
590 Objects.insert(Objects.begin(), StackObject(Size, Align, SPOffset,
593 /*Alloca*/ nullptr));
594 return -++NumFixedObjects;
598 MachineFrameInfo::getPristineRegs(const MachineBasicBlock *MBB) const {
599 assert(MBB && "MBB must be valid");
600 const MachineFunction *MF = MBB->getParent();
601 assert(MF && "MBB must be part of a MachineFunction");
602 const TargetMachine &TM = MF->getTarget();
603 const TargetRegisterInfo *TRI = TM.getRegisterInfo();
604 BitVector BV(TRI->getNumRegs());
606 // Before CSI is calculated, no registers are considered pristine. They can be
607 // freely used and PEI will make sure they are saved.
608 if (!isCalleeSavedInfoValid())
611 for (const MCPhysReg *CSR = TRI->getCalleeSavedRegs(MF); CSR && *CSR; ++CSR)
614 // The entry MBB always has all CSRs pristine.
615 if (MBB == &MF->front())
618 // On other MBBs the saved CSRs are not pristine.
619 const std::vector<CalleeSavedInfo> &CSI = getCalleeSavedInfo();
620 for (std::vector<CalleeSavedInfo>::const_iterator I = CSI.begin(),
621 E = CSI.end(); I != E; ++I)
622 BV.reset(I->getReg());
627 unsigned MachineFrameInfo::estimateStackSize(const MachineFunction &MF) const {
628 const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
629 const TargetRegisterInfo *RegInfo = MF.getTarget().getRegisterInfo();
630 unsigned MaxAlign = getMaxAlignment();
633 // This code is very, very similar to PEI::calculateFrameObjectOffsets().
634 // It really should be refactored to share code. Until then, changes
635 // should keep in mind that there's tight coupling between the two.
637 for (int i = getObjectIndexBegin(); i != 0; ++i) {
638 int FixedOff = -getObjectOffset(i);
639 if (FixedOff > Offset) Offset = FixedOff;
641 for (unsigned i = 0, e = getObjectIndexEnd(); i != e; ++i) {
642 if (isDeadObjectIndex(i))
644 Offset += getObjectSize(i);
645 unsigned Align = getObjectAlignment(i);
646 // Adjust to alignment boundary
647 Offset = (Offset+Align-1)/Align*Align;
649 MaxAlign = std::max(Align, MaxAlign);
652 if (adjustsStack() && TFI->hasReservedCallFrame(MF))
653 Offset += getMaxCallFrameSize();
655 // Round up the size to a multiple of the alignment. If the function has
656 // any calls or alloca's, align to the target's StackAlignment value to
657 // ensure that the callee's frame or the alloca data is suitably aligned;
658 // otherwise, for leaf functions, align to the TransientStackAlignment
661 if (adjustsStack() || hasVarSizedObjects() ||
662 (RegInfo->needsStackRealignment(MF) && getObjectIndexEnd() != 0))
663 StackAlign = TFI->getStackAlignment();
665 StackAlign = TFI->getTransientStackAlignment();
667 // If the frame pointer is eliminated, all frame offsets will be relative to
668 // SP not FP. Align to MaxAlign so this works.
669 StackAlign = std::max(StackAlign, MaxAlign);
670 unsigned AlignMask = StackAlign - 1;
671 Offset = (Offset + AlignMask) & ~uint64_t(AlignMask);
673 return (unsigned)Offset;
676 void MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{
677 if (Objects.empty()) return;
679 const TargetFrameLowering *FI = MF.getTarget().getFrameLowering();
680 int ValOffset = (FI ? FI->getOffsetOfLocalArea() : 0);
682 OS << "Frame Objects:\n";
684 for (unsigned i = 0, e = Objects.size(); i != e; ++i) {
685 const StackObject &SO = Objects[i];
686 OS << " fi#" << (int)(i-NumFixedObjects) << ": ";
687 if (SO.Size == ~0ULL) {
692 OS << "variable sized";
694 OS << "size=" << SO.Size;
695 OS << ", align=" << SO.Alignment;
697 if (i < NumFixedObjects)
699 if (i < NumFixedObjects || SO.SPOffset != -1) {
700 int64_t Off = SO.SPOffset - ValOffset;
701 OS << ", at location [SP";
712 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
713 void MachineFrameInfo::dump(const MachineFunction &MF) const {
718 //===----------------------------------------------------------------------===//
719 // MachineJumpTableInfo implementation
720 //===----------------------------------------------------------------------===//
722 /// getEntrySize - Return the size of each entry in the jump table.
723 unsigned MachineJumpTableInfo::getEntrySize(const DataLayout &TD) const {
724 // The size of a jump table entry is 4 bytes unless the entry is just the
725 // address of a block, in which case it is the pointer size.
726 switch (getEntryKind()) {
727 case MachineJumpTableInfo::EK_BlockAddress:
728 return TD.getPointerSize();
729 case MachineJumpTableInfo::EK_GPRel64BlockAddress:
731 case MachineJumpTableInfo::EK_GPRel32BlockAddress:
732 case MachineJumpTableInfo::EK_LabelDifference32:
733 case MachineJumpTableInfo::EK_Custom32:
735 case MachineJumpTableInfo::EK_Inline:
738 llvm_unreachable("Unknown jump table encoding!");
741 /// getEntryAlignment - Return the alignment of each entry in the jump table.
742 unsigned MachineJumpTableInfo::getEntryAlignment(const DataLayout &TD) const {
743 // The alignment of a jump table entry is the alignment of int32 unless the
744 // entry is just the address of a block, in which case it is the pointer
746 switch (getEntryKind()) {
747 case MachineJumpTableInfo::EK_BlockAddress:
748 return TD.getPointerABIAlignment();
749 case MachineJumpTableInfo::EK_GPRel64BlockAddress:
750 return TD.getABIIntegerTypeAlignment(64);
751 case MachineJumpTableInfo::EK_GPRel32BlockAddress:
752 case MachineJumpTableInfo::EK_LabelDifference32:
753 case MachineJumpTableInfo::EK_Custom32:
754 return TD.getABIIntegerTypeAlignment(32);
755 case MachineJumpTableInfo::EK_Inline:
758 llvm_unreachable("Unknown jump table encoding!");
761 /// createJumpTableIndex - Create a new jump table entry in the jump table info.
763 unsigned MachineJumpTableInfo::createJumpTableIndex(
764 const std::vector<MachineBasicBlock*> &DestBBs) {
765 assert(!DestBBs.empty() && "Cannot create an empty jump table!");
766 JumpTables.push_back(MachineJumpTableEntry(DestBBs));
767 return JumpTables.size()-1;
770 /// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update
771 /// the jump tables to branch to New instead.
772 bool MachineJumpTableInfo::ReplaceMBBInJumpTables(MachineBasicBlock *Old,
773 MachineBasicBlock *New) {
774 assert(Old != New && "Not making a change?");
775 bool MadeChange = false;
776 for (size_t i = 0, e = JumpTables.size(); i != e; ++i)
777 ReplaceMBBInJumpTable(i, Old, New);
781 /// ReplaceMBBInJumpTable - If Old is a target of the jump tables, update
782 /// the jump table to branch to New instead.
783 bool MachineJumpTableInfo::ReplaceMBBInJumpTable(unsigned Idx,
784 MachineBasicBlock *Old,
785 MachineBasicBlock *New) {
786 assert(Old != New && "Not making a change?");
787 bool MadeChange = false;
788 MachineJumpTableEntry &JTE = JumpTables[Idx];
789 for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j)
790 if (JTE.MBBs[j] == Old) {
797 void MachineJumpTableInfo::print(raw_ostream &OS) const {
798 if (JumpTables.empty()) return;
800 OS << "Jump Tables:\n";
802 for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) {
803 OS << " jt#" << i << ": ";
804 for (unsigned j = 0, f = JumpTables[i].MBBs.size(); j != f; ++j)
805 OS << " BB#" << JumpTables[i].MBBs[j]->getNumber();
811 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
812 void MachineJumpTableInfo::dump() const { print(dbgs()); }
816 //===----------------------------------------------------------------------===//
817 // MachineConstantPool implementation
818 //===----------------------------------------------------------------------===//
820 void MachineConstantPoolValue::anchor() { }
822 const DataLayout *MachineConstantPool::getDataLayout() const {
823 return TM.getDataLayout();
826 Type *MachineConstantPoolEntry::getType() const {
827 if (isMachineConstantPoolEntry())
828 return Val.MachineCPVal->getType();
829 return Val.ConstVal->getType();
833 unsigned MachineConstantPoolEntry::getRelocationInfo() const {
834 if (isMachineConstantPoolEntry())
835 return Val.MachineCPVal->getRelocationInfo();
836 return Val.ConstVal->getRelocationInfo();
840 MachineConstantPoolEntry::getSectionKind(const DataLayout *DL) const {
842 switch (getRelocationInfo()) {
844 llvm_unreachable("Unknown section kind");
846 Kind = SectionKind::getReadOnlyWithRel();
849 Kind = SectionKind::getReadOnlyWithRelLocal();
852 switch (DL->getTypeAllocSize(getType())) {
854 Kind = SectionKind::getMergeableConst4();
857 Kind = SectionKind::getMergeableConst8();
860 Kind = SectionKind::getMergeableConst16();
863 Kind = SectionKind::getMergeableConst();
870 MachineConstantPool::~MachineConstantPool() {
871 for (unsigned i = 0, e = Constants.size(); i != e; ++i)
872 if (Constants[i].isMachineConstantPoolEntry())
873 delete Constants[i].Val.MachineCPVal;
874 for (DenseSet<MachineConstantPoolValue*>::iterator I =
875 MachineCPVsSharingEntries.begin(), E = MachineCPVsSharingEntries.end();
880 /// CanShareConstantPoolEntry - Test whether the given two constants
881 /// can be allocated the same constant pool entry.
882 static bool CanShareConstantPoolEntry(const Constant *A, const Constant *B,
883 const DataLayout *TD) {
884 // Handle the trivial case quickly.
885 if (A == B) return true;
887 // If they have the same type but weren't the same constant, quickly
889 if (A->getType() == B->getType()) return false;
891 // We can't handle structs or arrays.
892 if (isa<StructType>(A->getType()) || isa<ArrayType>(A->getType()) ||
893 isa<StructType>(B->getType()) || isa<ArrayType>(B->getType()))
896 // For now, only support constants with the same size.
897 uint64_t StoreSize = TD->getTypeStoreSize(A->getType());
898 if (StoreSize != TD->getTypeStoreSize(B->getType()) || StoreSize > 128)
901 Type *IntTy = IntegerType::get(A->getContext(), StoreSize*8);
903 // Try constant folding a bitcast of both instructions to an integer. If we
904 // get two identical ConstantInt's, then we are good to share them. We use
905 // the constant folding APIs to do this so that we get the benefit of
907 if (isa<PointerType>(A->getType()))
908 A = ConstantFoldInstOperands(Instruction::PtrToInt, IntTy,
909 const_cast<Constant*>(A), TD);
910 else if (A->getType() != IntTy)
911 A = ConstantFoldInstOperands(Instruction::BitCast, IntTy,
912 const_cast<Constant*>(A), TD);
913 if (isa<PointerType>(B->getType()))
914 B = ConstantFoldInstOperands(Instruction::PtrToInt, IntTy,
915 const_cast<Constant*>(B), TD);
916 else if (B->getType() != IntTy)
917 B = ConstantFoldInstOperands(Instruction::BitCast, IntTy,
918 const_cast<Constant*>(B), TD);
923 /// getConstantPoolIndex - Create a new entry in the constant pool or return
924 /// an existing one. User must specify the log2 of the minimum required
925 /// alignment for the object.
927 unsigned MachineConstantPool::getConstantPoolIndex(const Constant *C,
928 unsigned Alignment) {
929 assert(Alignment && "Alignment must be specified!");
930 if (Alignment > PoolAlignment) PoolAlignment = Alignment;
932 // Check to see if we already have this constant.
934 // FIXME, this could be made much more efficient for large constant pools.
935 for (unsigned i = 0, e = Constants.size(); i != e; ++i)
936 if (!Constants[i].isMachineConstantPoolEntry() &&
937 CanShareConstantPoolEntry(Constants[i].Val.ConstVal, C,
939 if ((unsigned)Constants[i].getAlignment() < Alignment)
940 Constants[i].Alignment = Alignment;
944 Constants.push_back(MachineConstantPoolEntry(C, Alignment));
945 return Constants.size()-1;
948 unsigned MachineConstantPool::getConstantPoolIndex(MachineConstantPoolValue *V,
949 unsigned Alignment) {
950 assert(Alignment && "Alignment must be specified!");
951 if (Alignment > PoolAlignment) PoolAlignment = Alignment;
953 // Check to see if we already have this constant.
955 // FIXME, this could be made much more efficient for large constant pools.
956 int Idx = V->getExistingMachineCPValue(this, Alignment);
958 MachineCPVsSharingEntries.insert(V);
959 return (unsigned)Idx;
962 Constants.push_back(MachineConstantPoolEntry(V, Alignment));
963 return Constants.size()-1;
966 void MachineConstantPool::print(raw_ostream &OS) const {
967 if (Constants.empty()) return;
969 OS << "Constant Pool:\n";
970 for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
971 OS << " cp#" << i << ": ";
972 if (Constants[i].isMachineConstantPoolEntry())
973 Constants[i].Val.MachineCPVal->print(OS);
975 Constants[i].Val.ConstVal->printAsOperand(OS, /*PrintType=*/false);
976 OS << ", align=" << Constants[i].getAlignment();
981 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
982 void MachineConstantPool::dump() const { print(dbgs()); }