1 //===-- CodeGen/MachineFrameInfo.h - Abstract Stack Frame Rep. --*- C++ -*-===//
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 // The file defines the MachineFrameInfo class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CODEGEN_MACHINEFRAMEINFO_H
15 #define LLVM_CODEGEN_MACHINEFRAMEINFO_H
17 #include "llvm/ADT/SmallVector.h"
18 #include "llvm/Support/DataTypes.h"
25 class TargetRegisterClass;
27 class MachineFunction;
28 class MachineBasicBlock;
29 class TargetFrameLowering;
35 /// The CalleeSavedInfo class tracks the information need to locate where a
36 /// callee saved register is in the current frame.
37 class CalleeSavedInfo {
42 explicit CalleeSavedInfo(unsigned R, int FI = 0)
43 : Reg(R), FrameIdx(FI) {}
46 unsigned getReg() const { return Reg; }
47 int getFrameIdx() const { return FrameIdx; }
48 void setFrameIdx(int FI) { FrameIdx = FI; }
51 /// The MachineFrameInfo class represents an abstract stack frame until
52 /// prolog/epilog code is inserted. This class is key to allowing stack frame
53 /// representation optimizations, such as frame pointer elimination. It also
54 /// allows more mundane (but still important) optimizations, such as reordering
55 /// of abstract objects on the stack frame.
57 /// To support this, the class assigns unique integer identifiers to stack
58 /// objects requested clients. These identifiers are negative integers for
59 /// fixed stack objects (such as arguments passed on the stack) or nonnegative
60 /// for objects that may be reordered. Instructions which refer to stack
61 /// objects use a special MO_FrameIndex operand to represent these frame
64 /// Because this class keeps track of all references to the stack frame, it
65 /// knows when a variable sized object is allocated on the stack. This is the
66 /// sole condition which prevents frame pointer elimination, which is an
67 /// important optimization on register-poor architectures. Because original
68 /// variable sized alloca's in the source program are the only source of
69 /// variable sized stack objects, it is safe to decide whether there will be
70 /// any variable sized objects before all stack objects are known (for
71 /// example, register allocator spill code never needs variable sized
74 /// When prolog/epilog code emission is performed, the final stack frame is
75 /// built and the machine instructions are modified to refer to the actual
76 /// stack offsets of the object, eliminating all MO_FrameIndex operands from
79 /// @brief Abstract Stack Frame Information
80 class MachineFrameInfo {
82 // StackObject - Represent a single object allocated on the stack.
84 // SPOffset - The offset of this object from the stack pointer on entry to
85 // the function. This field has no meaning for a variable sized element.
88 // The size of this object on the stack. 0 means a variable sized object,
89 // ~0ULL means a dead object.
92 // Alignment - The required alignment of this stack slot.
95 // isImmutable - If true, the value of the stack object is set before
96 // entering the function and is not modified inside the function. By
97 // default, fixed objects are immutable unless marked otherwise.
100 // isSpillSlot - If true the stack object is used as spill slot. It
101 // cannot alias any other memory objects.
104 /// Alloca - If this stack object is originated from an Alloca instruction
105 /// this value saves the original IR allocation. Can be NULL.
106 const AllocaInst *Alloca;
108 // PreAllocated - If true, the object was mapped into the local frame
109 // block and doesn't need additional handling for allocation beyond that.
112 // If true, an LLVM IR value might point to this object.
113 // Normally, spill slots and fixed-offset objects don't alias IR-accessible
114 // objects, but there are exceptions (on PowerPC, for example, some byval
115 // arguments have ABI-prescribed offsets).
118 StackObject(uint64_t Sz, unsigned Al, int64_t SP, bool IM,
119 bool isSS, const AllocaInst *Val, bool A)
120 : SPOffset(SP), Size(Sz), Alignment(Al), isImmutable(IM),
121 isSpillSlot(isSS), Alloca(Val), PreAllocated(false), isAliased(A) {}
124 /// StackAlignment - The alignment of the stack.
125 unsigned StackAlignment;
127 /// StackRealignable - Can the stack be realigned.
128 bool StackRealignable;
130 /// Objects - The list of stack objects allocated...
132 std::vector<StackObject> Objects;
134 /// NumFixedObjects - This contains the number of fixed objects contained on
135 /// the stack. Because fixed objects are stored at a negative index in the
136 /// Objects list, this is also the index to the 0th object in the list.
138 unsigned NumFixedObjects;
140 /// HasVarSizedObjects - This boolean keeps track of whether any variable
141 /// sized objects have been allocated yet.
143 bool HasVarSizedObjects;
145 /// FrameAddressTaken - This boolean keeps track of whether there is a call
146 /// to builtin \@llvm.frameaddress.
147 bool FrameAddressTaken;
149 /// ReturnAddressTaken - This boolean keeps track of whether there is a call
150 /// to builtin \@llvm.returnaddress.
151 bool ReturnAddressTaken;
153 /// HasStackMap - This boolean keeps track of whether there is a call
154 /// to builtin \@llvm.experimental.stackmap.
157 /// HasPatchPoint - This boolean keeps track of whether there is a call
158 /// to builtin \@llvm.experimental.patchpoint.
161 /// StackSize - The prolog/epilog code inserter calculates the final stack
162 /// offsets for all of the fixed size objects, updating the Objects list
163 /// above. It then updates StackSize to contain the number of bytes that need
164 /// to be allocated on entry to the function.
168 /// OffsetAdjustment - The amount that a frame offset needs to be adjusted to
169 /// have the actual offset from the stack/frame pointer. The exact usage of
170 /// this is target-dependent, but it is typically used to adjust between
171 /// SP-relative and FP-relative offsets. E.G., if objects are accessed via
172 /// SP then OffsetAdjustment is zero; if FP is used, OffsetAdjustment is set
173 /// to the distance between the initial SP and the value in FP. For many
174 /// targets, this value is only used when generating debug info (via
175 /// TargetRegisterInfo::getFrameIndexOffset); when generating code, the
176 /// corresponding adjustments are performed directly.
177 int OffsetAdjustment;
179 /// MaxAlignment - The prolog/epilog code inserter may process objects
180 /// that require greater alignment than the default alignment the target
181 /// provides. To handle this, MaxAlignment is set to the maximum alignment
182 /// needed by the objects on the current frame. If this is greater than the
183 /// native alignment maintained by the compiler, dynamic alignment code will
186 unsigned MaxAlignment;
188 /// AdjustsStack - Set to true if this function adjusts the stack -- e.g.,
189 /// when calling another function. This is only valid during and after
190 /// prolog/epilog code insertion.
193 /// HasCalls - Set to true if this function has any function calls.
196 /// StackProtectorIdx - The frame index for the stack protector.
197 int StackProtectorIdx;
199 /// FunctionContextIdx - The frame index for the function context. Used for
201 int FunctionContextIdx;
203 /// MaxCallFrameSize - This contains the size of the largest call frame if the
204 /// target uses frame setup/destroy pseudo instructions (as defined in the
205 /// TargetFrameInfo class). This information is important for frame pointer
206 /// elimination. If is only valid during and after prolog/epilog code
209 unsigned MaxCallFrameSize;
211 /// CSInfo - The prolog/epilog code inserter fills in this vector with each
212 /// callee saved register saved in the frame. Beyond its use by the prolog/
213 /// epilog code inserter, this data used for debug info and exception
215 std::vector<CalleeSavedInfo> CSInfo;
217 /// CSIValid - Has CSInfo been set yet?
220 /// LocalFrameObjects - References to frame indices which are mapped
221 /// into the local frame allocation block. <FrameIdx, LocalOffset>
222 SmallVector<std::pair<int, int64_t>, 32> LocalFrameObjects;
224 /// LocalFrameSize - Size of the pre-allocated local frame block.
225 int64_t LocalFrameSize;
227 /// Required alignment of the local object blob, which is the strictest
228 /// alignment of any object in it.
229 unsigned LocalFrameMaxAlign;
231 /// Whether the local object blob needs to be allocated together. If not,
232 /// PEI should ignore the isPreAllocated flags on the stack objects and
233 /// just allocate them normally.
234 bool UseLocalStackAllocationBlock;
236 /// Whether the "realign-stack" option is on.
239 /// True if the function includes inline assembly that adjusts the stack
241 bool HasInlineAsmWithSPAdjust;
243 /// True if the function contains a call to the llvm.vastart intrinsic.
246 /// True if this is a varargs function that contains a musttail call.
247 bool HasMustTailInVarArgFunc;
249 /// True if this function contains a tail call. If so immutable objects like
250 /// function arguments are no longer so. A tail call *can* override fixed
251 /// stack objects like arguments so we can't treat them as immutable.
254 /// Not null, if shrink-wrapping found a better place for the prologue.
255 MachineBasicBlock *Save;
256 /// Not null, if shrink-wrapping found a better place for the epilogue.
257 MachineBasicBlock *Restore;
260 explicit MachineFrameInfo(unsigned StackAlign, bool isStackRealign,
262 : StackAlignment(StackAlign), StackRealignable(isStackRealign),
263 RealignOption(RealignOpt) {
264 StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0;
265 HasVarSizedObjects = false;
266 FrameAddressTaken = false;
267 ReturnAddressTaken = false;
269 HasPatchPoint = false;
270 AdjustsStack = false;
272 StackProtectorIdx = -1;
273 FunctionContextIdx = -1;
274 MaxCallFrameSize = 0;
277 LocalFrameMaxAlign = 0;
278 UseLocalStackAllocationBlock = false;
279 HasInlineAsmWithSPAdjust = false;
281 HasMustTailInVarArgFunc = false;
287 /// hasStackObjects - Return true if there are any stack objects in this
290 bool hasStackObjects() const { return !Objects.empty(); }
292 /// hasVarSizedObjects - This method may be called any time after instruction
293 /// selection is complete to determine if the stack frame for this function
294 /// contains any variable sized objects.
296 bool hasVarSizedObjects() const { return HasVarSizedObjects; }
298 /// getStackProtectorIndex/setStackProtectorIndex - Return the index for the
299 /// stack protector object.
301 int getStackProtectorIndex() const { return StackProtectorIdx; }
302 void setStackProtectorIndex(int I) { StackProtectorIdx = I; }
304 /// getFunctionContextIndex/setFunctionContextIndex - Return the index for the
305 /// function context object. This object is used for SjLj exceptions.
306 int getFunctionContextIndex() const { return FunctionContextIdx; }
307 void setFunctionContextIndex(int I) { FunctionContextIdx = I; }
309 /// isFrameAddressTaken - This method may be called any time after instruction
310 /// selection is complete to determine if there is a call to
311 /// \@llvm.frameaddress in this function.
312 bool isFrameAddressTaken() const { return FrameAddressTaken; }
313 void setFrameAddressIsTaken(bool T) { FrameAddressTaken = T; }
315 /// isReturnAddressTaken - This method may be called any time after
316 /// instruction selection is complete to determine if there is a call to
317 /// \@llvm.returnaddress in this function.
318 bool isReturnAddressTaken() const { return ReturnAddressTaken; }
319 void setReturnAddressIsTaken(bool s) { ReturnAddressTaken = s; }
321 /// hasStackMap - This method may be called any time after instruction
322 /// selection is complete to determine if there is a call to builtin
323 /// \@llvm.experimental.stackmap.
324 bool hasStackMap() const { return HasStackMap; }
325 void setHasStackMap(bool s = true) { HasStackMap = s; }
327 /// hasPatchPoint - This method may be called any time after instruction
328 /// selection is complete to determine if there is a call to builtin
329 /// \@llvm.experimental.patchpoint.
330 bool hasPatchPoint() const { return HasPatchPoint; }
331 void setHasPatchPoint(bool s = true) { HasPatchPoint = s; }
333 /// getObjectIndexBegin - Return the minimum frame object index.
335 int getObjectIndexBegin() const { return -NumFixedObjects; }
337 /// getObjectIndexEnd - Return one past the maximum frame object index.
339 int getObjectIndexEnd() const { return (int)Objects.size()-NumFixedObjects; }
341 /// getNumFixedObjects - Return the number of fixed objects.
342 unsigned getNumFixedObjects() const { return NumFixedObjects; }
344 /// getNumObjects - Return the number of objects.
346 unsigned getNumObjects() const { return Objects.size(); }
348 /// mapLocalFrameObject - Map a frame index into the local object block
349 void mapLocalFrameObject(int ObjectIndex, int64_t Offset) {
350 LocalFrameObjects.push_back(std::pair<int, int64_t>(ObjectIndex, Offset));
351 Objects[ObjectIndex + NumFixedObjects].PreAllocated = true;
354 /// getLocalFrameObjectMap - Get the local offset mapping for a for an object
355 std::pair<int, int64_t> getLocalFrameObjectMap(int i) {
356 assert (i >= 0 && (unsigned)i < LocalFrameObjects.size() &&
357 "Invalid local object reference!");
358 return LocalFrameObjects[i];
361 /// getLocalFrameObjectCount - Return the number of objects allocated into
362 /// the local object block.
363 int64_t getLocalFrameObjectCount() { return LocalFrameObjects.size(); }
365 /// setLocalFrameSize - Set the size of the local object blob.
366 void setLocalFrameSize(int64_t sz) { LocalFrameSize = sz; }
368 /// getLocalFrameSize - Get the size of the local object blob.
369 int64_t getLocalFrameSize() const { return LocalFrameSize; }
371 /// setLocalFrameMaxAlign - Required alignment of the local object blob,
372 /// which is the strictest alignment of any object in it.
373 void setLocalFrameMaxAlign(unsigned Align) { LocalFrameMaxAlign = Align; }
375 /// getLocalFrameMaxAlign - Return the required alignment of the local
377 unsigned getLocalFrameMaxAlign() const { return LocalFrameMaxAlign; }
379 /// getUseLocalStackAllocationBlock - Get whether the local allocation blob
380 /// should be allocated together or let PEI allocate the locals in it
382 bool getUseLocalStackAllocationBlock() {return UseLocalStackAllocationBlock;}
384 /// setUseLocalStackAllocationBlock - Set whether the local allocation blob
385 /// should be allocated together or let PEI allocate the locals in it
387 void setUseLocalStackAllocationBlock(bool v) {
388 UseLocalStackAllocationBlock = v;
391 /// isObjectPreAllocated - Return true if the object was pre-allocated into
393 bool isObjectPreAllocated(int ObjectIdx) const {
394 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
395 "Invalid Object Idx!");
396 return Objects[ObjectIdx+NumFixedObjects].PreAllocated;
399 /// getObjectSize - Return the size of the specified object.
401 int64_t getObjectSize(int ObjectIdx) const {
402 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
403 "Invalid Object Idx!");
404 return Objects[ObjectIdx+NumFixedObjects].Size;
407 /// setObjectSize - Change the size of the specified stack object.
408 void setObjectSize(int ObjectIdx, int64_t Size) {
409 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
410 "Invalid Object Idx!");
411 Objects[ObjectIdx+NumFixedObjects].Size = Size;
414 /// getObjectAlignment - Return the alignment of the specified stack object.
415 unsigned getObjectAlignment(int ObjectIdx) const {
416 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
417 "Invalid Object Idx!");
418 return Objects[ObjectIdx+NumFixedObjects].Alignment;
421 /// setObjectAlignment - Change the alignment of the specified stack object.
422 void setObjectAlignment(int ObjectIdx, unsigned Align) {
423 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
424 "Invalid Object Idx!");
425 Objects[ObjectIdx+NumFixedObjects].Alignment = Align;
426 ensureMaxAlignment(Align);
429 /// getObjectAllocation - Return the underlying Alloca of the specified
430 /// stack object if it exists. Returns 0 if none exists.
431 const AllocaInst* getObjectAllocation(int ObjectIdx) const {
432 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
433 "Invalid Object Idx!");
434 return Objects[ObjectIdx+NumFixedObjects].Alloca;
437 /// getObjectOffset - Return the assigned stack offset of the specified object
438 /// from the incoming stack pointer.
440 int64_t getObjectOffset(int ObjectIdx) const {
441 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
442 "Invalid Object Idx!");
443 assert(!isDeadObjectIndex(ObjectIdx) &&
444 "Getting frame offset for a dead object?");
445 return Objects[ObjectIdx+NumFixedObjects].SPOffset;
448 /// setObjectOffset - Set the stack frame offset of the specified object. The
449 /// offset is relative to the stack pointer on entry to the function.
451 void setObjectOffset(int ObjectIdx, int64_t SPOffset) {
452 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
453 "Invalid Object Idx!");
454 assert(!isDeadObjectIndex(ObjectIdx) &&
455 "Setting frame offset for a dead object?");
456 Objects[ObjectIdx+NumFixedObjects].SPOffset = SPOffset;
459 /// getStackSize - Return the number of bytes that must be allocated to hold
460 /// all of the fixed size frame objects. This is only valid after
461 /// Prolog/Epilog code insertion has finalized the stack frame layout.
463 uint64_t getStackSize() const { return StackSize; }
465 /// setStackSize - Set the size of the stack...
467 void setStackSize(uint64_t Size) { StackSize = Size; }
469 /// Estimate and return the size of the stack frame.
470 unsigned estimateStackSize(const MachineFunction &MF) const;
472 /// getOffsetAdjustment - Return the correction for frame offsets.
474 int getOffsetAdjustment() const { return OffsetAdjustment; }
476 /// setOffsetAdjustment - Set the correction for frame offsets.
478 void setOffsetAdjustment(int Adj) { OffsetAdjustment = Adj; }
480 /// getMaxAlignment - Return the alignment in bytes that this function must be
481 /// aligned to, which is greater than the default stack alignment provided by
484 unsigned getMaxAlignment() const { return MaxAlignment; }
486 /// ensureMaxAlignment - Make sure the function is at least Align bytes
488 void ensureMaxAlignment(unsigned Align);
490 /// AdjustsStack - Return true if this function adjusts the stack -- e.g.,
491 /// when calling another function. This is only valid during and after
492 /// prolog/epilog code insertion.
493 bool adjustsStack() const { return AdjustsStack; }
494 void setAdjustsStack(bool V) { AdjustsStack = V; }
496 /// hasCalls - Return true if the current function has any function calls.
497 bool hasCalls() const { return HasCalls; }
498 void setHasCalls(bool V) { HasCalls = V; }
500 /// Returns true if the function contains any stack-adjusting inline assembly.
501 bool hasInlineAsmWithSPAdjust() const { return HasInlineAsmWithSPAdjust; }
502 void setHasInlineAsmWithSPAdjust(bool B) { HasInlineAsmWithSPAdjust = B; }
504 /// Returns true if the function calls the llvm.va_start intrinsic.
505 bool hasVAStart() const { return HasVAStart; }
506 void setHasVAStart(bool B) { HasVAStart = B; }
508 /// Returns true if the function is variadic and contains a musttail call.
509 bool hasMustTailInVarArgFunc() const { return HasMustTailInVarArgFunc; }
510 void setHasMustTailInVarArgFunc(bool B) { HasMustTailInVarArgFunc = B; }
512 /// Returns true if the function contains a tail call.
513 bool hasTailCall() const { return HasTailCall; }
514 void setHasTailCall() { HasTailCall = true; }
516 /// getMaxCallFrameSize - Return the maximum size of a call frame that must be
517 /// allocated for an outgoing function call. This is only available if
518 /// CallFrameSetup/Destroy pseudo instructions are used by the target, and
519 /// then only during or after prolog/epilog code insertion.
521 unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; }
522 void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; }
524 /// CreateFixedObject - Create a new object at a fixed location on the stack.
525 /// All fixed objects should be created before other objects are created for
526 /// efficiency. By default, fixed objects are not pointed to by LLVM IR
527 /// values. This returns an index with a negative value.
529 int CreateFixedObject(uint64_t Size, int64_t SPOffset, bool Immutable,
530 bool isAliased = false);
532 /// CreateFixedSpillStackObject - Create a spill slot at a fixed location
533 /// on the stack. Returns an index with a negative value.
534 int CreateFixedSpillStackObject(uint64_t Size, int64_t SPOffset);
536 /// isFixedObjectIndex - Returns true if the specified index corresponds to a
537 /// fixed stack object.
538 bool isFixedObjectIndex(int ObjectIdx) const {
539 return ObjectIdx < 0 && (ObjectIdx >= -(int)NumFixedObjects);
542 /// isAliasedObjectIndex - Returns true if the specified index corresponds
543 /// to an object that might be pointed to by an LLVM IR value.
544 bool isAliasedObjectIndex(int ObjectIdx) const {
545 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
546 "Invalid Object Idx!");
547 return Objects[ObjectIdx+NumFixedObjects].isAliased;
550 /// isImmutableObjectIndex - Returns true if the specified index corresponds
551 /// to an immutable object.
552 bool isImmutableObjectIndex(int ObjectIdx) const {
553 // Tail calling functions can clobber their function arguments.
556 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
557 "Invalid Object Idx!");
558 return Objects[ObjectIdx+NumFixedObjects].isImmutable;
561 /// isSpillSlotObjectIndex - Returns true if the specified index corresponds
562 /// to a spill slot..
563 bool isSpillSlotObjectIndex(int ObjectIdx) const {
564 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
565 "Invalid Object Idx!");
566 return Objects[ObjectIdx+NumFixedObjects].isSpillSlot;
569 /// isDeadObjectIndex - Returns true if the specified index corresponds to
571 bool isDeadObjectIndex(int ObjectIdx) const {
572 assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
573 "Invalid Object Idx!");
574 return Objects[ObjectIdx+NumFixedObjects].Size == ~0ULL;
577 /// CreateStackObject - Create a new statically sized stack object, returning
578 /// a nonnegative identifier to represent it.
580 int CreateStackObject(uint64_t Size, unsigned Alignment, bool isSS,
581 const AllocaInst *Alloca = nullptr);
583 /// CreateSpillStackObject - Create a new statically sized stack object that
584 /// represents a spill slot, returning a nonnegative identifier to represent
587 int CreateSpillStackObject(uint64_t Size, unsigned Alignment);
589 /// RemoveStackObject - Remove or mark dead a statically sized stack object.
591 void RemoveStackObject(int ObjectIdx) {
593 Objects[ObjectIdx+NumFixedObjects].Size = ~0ULL;
596 /// CreateVariableSizedObject - Notify the MachineFrameInfo object that a
597 /// variable sized object has been created. This must be created whenever a
598 /// variable sized object is created, whether or not the index returned is
601 int CreateVariableSizedObject(unsigned Alignment, const AllocaInst *Alloca);
603 /// getCalleeSavedInfo - Returns a reference to call saved info vector for the
604 /// current function.
605 const std::vector<CalleeSavedInfo> &getCalleeSavedInfo() const {
609 /// setCalleeSavedInfo - Used by prolog/epilog inserter to set the function's
610 /// callee saved information.
611 void setCalleeSavedInfo(const std::vector<CalleeSavedInfo> &CSI) {
615 /// isCalleeSavedInfoValid - Has the callee saved info been calculated yet?
616 bool isCalleeSavedInfoValid() const { return CSIValid; }
618 void setCalleeSavedInfoValid(bool v) { CSIValid = v; }
620 MachineBasicBlock *getSavePoint() const { return Save; }
621 void setSavePoint(MachineBasicBlock *NewSave) { Save = NewSave; }
622 MachineBasicBlock *getRestorePoint() const { return Restore; }
623 void setRestorePoint(MachineBasicBlock *NewRestore) { Restore = NewRestore; }
625 /// Return a set of physical registers that are pristine.
627 /// Pristine registers hold a value that is useless to the current function,
628 /// but that must be preserved - they are callee saved registers that are not
631 /// Before the PrologueEpilogueInserter has placed the CSR spill code, this
632 /// method always returns an empty set.
633 BitVector getPristineRegs(const MachineFunction &MF) const;
635 /// print - Used by the MachineFunction printer to print information about
636 /// stack objects. Implemented in MachineFunction.cpp
638 void print(const MachineFunction &MF, raw_ostream &OS) const;
640 /// dump - Print the function to stderr.
641 void dump(const MachineFunction &MF) const;
644 } // End llvm namespace