/// @brief Abstract Stack Frame Information
class MachineFrameInfo {
- // StackObject - Represent a single object allocated on the stack.
+ // Represent a single object allocated on the stack.
struct StackObject {
- // SPOffset - The offset of this object from the stack pointer on entry to
+ // The offset of this object from the stack pointer on entry to
// the function. This field has no meaning for a variable sized element.
int64_t SPOffset;
// ~0ULL means a dead object.
uint64_t Size;
- // Alignment - The required alignment of this stack slot.
+ // The required alignment of this stack slot.
unsigned Alignment;
- // isImmutable - If true, the value of the stack object is set before
+ // If true, the value of the stack object is set before
// entering the function and is not modified inside the function. By
// default, fixed objects are immutable unless marked otherwise.
bool isImmutable;
- // isSpillSlot - If true the stack object is used as spill slot. It
+ // If true the stack object is used as spill slot. It
// cannot alias any other memory objects.
bool isSpillSlot;
- /// Alloca - If this stack object is originated from an Alloca instruction
+ /// If this stack object is originated from an Alloca instruction
/// this value saves the original IR allocation. Can be NULL.
const AllocaInst *Alloca;
- // PreAllocated - If true, the object was mapped into the local frame
+ // If true, the object was mapped into the local frame
// block and doesn't need additional handling for allocation beyond that.
bool PreAllocated;
+ // If true, an LLVM IR value might point to this object.
+ // Normally, spill slots and fixed-offset objects don't alias IR-accessible
+ // objects, but there are exceptions (on PowerPC, for example, some byval
+ // arguments have ABI-prescribed offsets).
+ bool isAliased;
+
StackObject(uint64_t Sz, unsigned Al, int64_t SP, bool IM,
- bool isSS, const AllocaInst *Val)
+ bool isSS, const AllocaInst *Val, bool A)
: SPOffset(SP), Size(Sz), Alignment(Al), isImmutable(IM),
- isSpillSlot(isSS), Alloca(Val), PreAllocated(false) {}
+ isSpillSlot(isSS), Alloca(Val), PreAllocated(false), isAliased(A) {}
};
- const TargetMachine &TM;
+ /// The alignment of the stack.
+ unsigned StackAlignment;
- /// Objects - The list of stack objects allocated...
- ///
+ /// Can the stack be realigned.
+ bool StackRealignable;
+
+ /// The list of stack objects allocated.
std::vector<StackObject> Objects;
- /// NumFixedObjects - This contains the number of fixed objects contained on
+ /// This contains the number of fixed objects contained on
/// the stack. Because fixed objects are stored at a negative index in the
/// Objects list, this is also the index to the 0th object in the list.
- ///
unsigned NumFixedObjects;
- /// HasVarSizedObjects - This boolean keeps track of whether any variable
+ /// This boolean keeps track of whether any variable
/// sized objects have been allocated yet.
- ///
bool HasVarSizedObjects;
- /// FrameAddressTaken - This boolean keeps track of whether there is a call
+ /// This boolean keeps track of whether there is a call
/// to builtin \@llvm.frameaddress.
bool FrameAddressTaken;
- /// ReturnAddressTaken - This boolean keeps track of whether there is a call
+ /// This boolean keeps track of whether there is a call
/// to builtin \@llvm.returnaddress.
bool ReturnAddressTaken;
- /// HasStackMap - This boolean keeps track of whether there is a call
+ /// This boolean keeps track of whether there is a call
/// to builtin \@llvm.experimental.stackmap.
bool HasStackMap;
- /// HasPatchPoint - This boolean keeps track of whether there is a call
+ /// This boolean keeps track of whether there is a call
/// to builtin \@llvm.experimental.patchpoint.
bool HasPatchPoint;
- /// StackSize - The prolog/epilog code inserter calculates the final stack
+ /// The prolog/epilog code inserter calculates the final stack
/// offsets for all of the fixed size objects, updating the Objects list
/// above. It then updates StackSize to contain the number of bytes that need
/// to be allocated on entry to the function.
- ///
uint64_t StackSize;
- /// OffsetAdjustment - The amount that a frame offset needs to be adjusted to
+ /// The amount that a frame offset needs to be adjusted to
/// have the actual offset from the stack/frame pointer. The exact usage of
/// this is target-dependent, but it is typically used to adjust between
/// SP-relative and FP-relative offsets. E.G., if objects are accessed via
/// corresponding adjustments are performed directly.
int OffsetAdjustment;
- /// MaxAlignment - The prolog/epilog code inserter may process objects
- /// that require greater alignment than the default alignment the target
- /// provides. To handle this, MaxAlignment is set to the maximum alignment
+ /// The prolog/epilog code inserter may process objects that require greater
+ /// alignment than the default alignment the target provides.
+ /// To handle this, MaxAlignment is set to the maximum alignment
/// needed by the objects on the current frame. If this is greater than the
/// native alignment maintained by the compiler, dynamic alignment code will
/// be needed.
///
unsigned MaxAlignment;
- /// AdjustsStack - Set to true if this function adjusts the stack -- e.g.,
+ /// Set to true if this function adjusts the stack -- e.g.,
/// when calling another function. This is only valid during and after
/// prolog/epilog code insertion.
bool AdjustsStack;
- /// HasCalls - Set to true if this function has any function calls.
+ /// Set to true if this function has any function calls.
bool HasCalls;
- /// StackProtectorIdx - The frame index for the stack protector.
+ /// The frame index for the stack protector.
int StackProtectorIdx;
- /// FunctionContextIdx - The frame index for the function context. Used for
- /// SjLj exceptions.
+ /// The frame index for the function context. Used for SjLj exceptions.
int FunctionContextIdx;
- /// MaxCallFrameSize - This contains the size of the largest call frame if the
- /// target uses frame setup/destroy pseudo instructions (as defined in the
- /// TargetFrameInfo class). This information is important for frame pointer
- /// elimination. If is only valid during and after prolog/epilog code
- /// insertion.
- ///
+ /// This contains the size of the largest call frame if the target uses frame
+ /// setup/destroy pseudo instructions (as defined in the TargetFrameInfo
+ /// class). This information is important for frame pointer elimination.
+ /// If is only valid during and after prolog/epilog code insertion.
unsigned MaxCallFrameSize;
- /// CSInfo - The prolog/epilog code inserter fills in this vector with each
+ /// The prolog/epilog code inserter fills in this vector with each
/// callee saved register saved in the frame. Beyond its use by the prolog/
/// epilog code inserter, this data used for debug info and exception
/// handling.
std::vector<CalleeSavedInfo> CSInfo;
- /// CSIValid - Has CSInfo been set yet?
+ /// Has CSInfo been set yet?
bool CSIValid;
- /// LocalFrameObjects - References to frame indices which are mapped
+ /// References to frame indices which are mapped
/// into the local frame allocation block. <FrameIdx, LocalOffset>
SmallVector<std::pair<int, int64_t>, 32> LocalFrameObjects;
- /// LocalFrameSize - Size of the pre-allocated local frame block.
+ /// Size of the pre-allocated local frame block.
int64_t LocalFrameSize;
/// Required alignment of the local object blob, which is the strictest
/// Whether the "realign-stack" option is on.
bool RealignOption;
- /// True if the function includes inline assembly that adjusts the stack
- /// pointer.
- bool HasInlineAsmWithSPAdjust;
+ /// True if the function dynamically adjusts the stack pointer through some
+ /// opaque mechanism like inline assembly or Win32 EH.
+ bool HasOpaqueSPAdjustment;
+
+ /// True if the function contains a call to the llvm.vastart intrinsic.
+ bool HasVAStart;
+
+ /// True if this is a varargs function that contains a musttail call.
+ bool HasMustTailInVarArgFunc;
+
+ /// True if this function contains a tail call. If so immutable objects like
+ /// function arguments are no longer so. A tail call *can* override fixed
+ /// stack objects like arguments so we can't treat them as immutable.
+ bool HasTailCall;
+
+ /// Not null, if shrink-wrapping found a better place for the prologue.
+ MachineBasicBlock *Save;
+ /// Not null, if shrink-wrapping found a better place for the epilogue.
+ MachineBasicBlock *Restore;
- const TargetFrameLowering *getFrameLowering() const;
public:
- explicit MachineFrameInfo(const TargetMachine &TM, bool RealignOpt)
- : TM(TM), RealignOption(RealignOpt) {
+ explicit MachineFrameInfo(unsigned StackAlign, bool isStackRealign,
+ bool RealignOpt)
+ : StackAlignment(StackAlign), StackRealignable(isStackRealign),
+ RealignOption(RealignOpt) {
StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0;
HasVarSizedObjects = false;
FrameAddressTaken = false;
LocalFrameSize = 0;
LocalFrameMaxAlign = 0;
UseLocalStackAllocationBlock = false;
- HasInlineAsmWithSPAdjust = false;
+ HasOpaqueSPAdjustment = false;
+ HasVAStart = false;
+ HasMustTailInVarArgFunc = false;
+ Save = nullptr;
+ Restore = nullptr;
+ HasTailCall = false;
}
- /// hasStackObjects - Return true if there are any stack objects in this
- /// function.
- ///
+ /// Return true if there are any stack objects in this function.
bool hasStackObjects() const { return !Objects.empty(); }
- /// hasVarSizedObjects - This method may be called any time after instruction
+ /// This method may be called any time after instruction
/// selection is complete to determine if the stack frame for this function
/// contains any variable sized objects.
- ///
bool hasVarSizedObjects() const { return HasVarSizedObjects; }
- /// getStackProtectorIndex/setStackProtectorIndex - Return the index for the
- /// stack protector object.
- ///
+ /// Return the index for the stack protector object.
int getStackProtectorIndex() const { return StackProtectorIdx; }
void setStackProtectorIndex(int I) { StackProtectorIdx = I; }
- /// getFunctionContextIndex/setFunctionContextIndex - Return the index for the
- /// function context object. This object is used for SjLj exceptions.
+ /// Return the index for the function context object.
+ /// This object is used for SjLj exceptions.
int getFunctionContextIndex() const { return FunctionContextIdx; }
void setFunctionContextIndex(int I) { FunctionContextIdx = I; }
- /// isFrameAddressTaken - This method may be called any time after instruction
+ /// This method may be called any time after instruction
/// selection is complete to determine if there is a call to
/// \@llvm.frameaddress in this function.
bool isFrameAddressTaken() const { return FrameAddressTaken; }
void setFrameAddressIsTaken(bool T) { FrameAddressTaken = T; }
- /// isReturnAddressTaken - This method may be called any time after
+ /// This method may be called any time after
/// instruction selection is complete to determine if there is a call to
/// \@llvm.returnaddress in this function.
bool isReturnAddressTaken() const { return ReturnAddressTaken; }
void setReturnAddressIsTaken(bool s) { ReturnAddressTaken = s; }
- /// hasStackMap - This method may be called any time after instruction
+ /// This method may be called any time after instruction
/// selection is complete to determine if there is a call to builtin
/// \@llvm.experimental.stackmap.
bool hasStackMap() const { return HasStackMap; }
void setHasStackMap(bool s = true) { HasStackMap = s; }
- /// hasPatchPoint - This method may be called any time after instruction
+ /// This method may be called any time after instruction
/// selection is complete to determine if there is a call to builtin
/// \@llvm.experimental.patchpoint.
bool hasPatchPoint() const { return HasPatchPoint; }
void setHasPatchPoint(bool s = true) { HasPatchPoint = s; }
- /// getObjectIndexBegin - Return the minimum frame object index.
- ///
+ /// Return the minimum frame object index.
int getObjectIndexBegin() const { return -NumFixedObjects; }
- /// getObjectIndexEnd - Return one past the maximum frame object index.
- ///
+ /// Return one past the maximum frame object index.
int getObjectIndexEnd() const { return (int)Objects.size()-NumFixedObjects; }
- /// getNumFixedObjects - Return the number of fixed objects.
+ /// Return the number of fixed objects.
unsigned getNumFixedObjects() const { return NumFixedObjects; }
- /// getNumObjects - Return the number of objects.
- ///
+ /// Return the number of objects.
unsigned getNumObjects() const { return Objects.size(); }
- /// mapLocalFrameObject - Map a frame index into the local object block
+ /// Map a frame index into the local object block
void mapLocalFrameObject(int ObjectIndex, int64_t Offset) {
LocalFrameObjects.push_back(std::pair<int, int64_t>(ObjectIndex, Offset));
Objects[ObjectIndex + NumFixedObjects].PreAllocated = true;
}
- /// getLocalFrameObjectMap - Get the local offset mapping for a for an object
- std::pair<int, int64_t> getLocalFrameObjectMap(int i) {
+ /// Get the local offset mapping for a for an object.
+ std::pair<int, int64_t> getLocalFrameObjectMap(int i) const {
assert (i >= 0 && (unsigned)i < LocalFrameObjects.size() &&
"Invalid local object reference!");
return LocalFrameObjects[i];
}
- /// getLocalFrameObjectCount - Return the number of objects allocated into
- /// the local object block.
- int64_t getLocalFrameObjectCount() { return LocalFrameObjects.size(); }
+ /// Return the number of objects allocated into the local object block.
+ int64_t getLocalFrameObjectCount() const { return LocalFrameObjects.size(); }
- /// setLocalFrameSize - Set the size of the local object blob.
+ /// Set the size of the local object blob.
void setLocalFrameSize(int64_t sz) { LocalFrameSize = sz; }
- /// getLocalFrameSize - Get the size of the local object blob.
+ /// Get the size of the local object blob.
int64_t getLocalFrameSize() const { return LocalFrameSize; }
- /// setLocalFrameMaxAlign - Required alignment of the local object blob,
+ /// Required alignment of the local object blob,
/// which is the strictest alignment of any object in it.
void setLocalFrameMaxAlign(unsigned Align) { LocalFrameMaxAlign = Align; }
- /// getLocalFrameMaxAlign - Return the required alignment of the local
- /// object blob.
+ /// Return the required alignment of the local object blob.
unsigned getLocalFrameMaxAlign() const { return LocalFrameMaxAlign; }
- /// getUseLocalStackAllocationBlock - Get whether the local allocation blob
- /// should be allocated together or let PEI allocate the locals in it
- /// directly.
- bool getUseLocalStackAllocationBlock() {return UseLocalStackAllocationBlock;}
+ /// Get whether the local allocation blob should be allocated together or
+ /// let PEI allocate the locals in it directly.
+ bool getUseLocalStackAllocationBlock() const {
+ return UseLocalStackAllocationBlock;
+ }
/// setUseLocalStackAllocationBlock - Set whether the local allocation blob
/// should be allocated together or let PEI allocate the locals in it
UseLocalStackAllocationBlock = v;
}
- /// isObjectPreAllocated - Return true if the object was pre-allocated into
- /// the local block.
+ /// Return true if the object was pre-allocated into the local block.
bool isObjectPreAllocated(int ObjectIdx) const {
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
return Objects[ObjectIdx+NumFixedObjects].PreAllocated;
}
- /// getObjectSize - Return the size of the specified object.
- ///
+ /// Return the size of the specified object.
int64_t getObjectSize(int ObjectIdx) const {
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
return Objects[ObjectIdx+NumFixedObjects].Size;
}
- /// setObjectSize - Change the size of the specified stack object.
+ /// Change the size of the specified stack object.
void setObjectSize(int ObjectIdx, int64_t Size) {
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
Objects[ObjectIdx+NumFixedObjects].Size = Size;
}
- /// getObjectAlignment - Return the alignment of the specified stack object.
+ /// Return the alignment of the specified stack object.
unsigned getObjectAlignment(int ObjectIdx) const {
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
ensureMaxAlignment(Align);
}
- /// getObjectAllocation - Return the underlying Alloca of the specified
+ /// Return the underlying Alloca of the specified
/// stack object if it exists. Returns 0 if none exists.
const AllocaInst* getObjectAllocation(int ObjectIdx) const {
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
return Objects[ObjectIdx+NumFixedObjects].Alloca;
}
- /// getObjectOffset - Return the assigned stack offset of the specified object
+ /// Return the assigned stack offset of the specified object
/// from the incoming stack pointer.
- ///
int64_t getObjectOffset(int ObjectIdx) const {
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
return Objects[ObjectIdx+NumFixedObjects].SPOffset;
}
- /// setObjectOffset - Set the stack frame offset of the specified object. The
+ /// Set the stack frame offset of the specified object. The
/// offset is relative to the stack pointer on entry to the function.
- ///
void setObjectOffset(int ObjectIdx, int64_t SPOffset) {
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
Objects[ObjectIdx+NumFixedObjects].SPOffset = SPOffset;
}
- /// getStackSize - Return the number of bytes that must be allocated to hold
+ /// Return the number of bytes that must be allocated to hold
/// all of the fixed size frame objects. This is only valid after
/// Prolog/Epilog code insertion has finalized the stack frame layout.
- ///
uint64_t getStackSize() const { return StackSize; }
- /// setStackSize - Set the size of the stack...
- ///
+ /// Set the size of the stack.
void setStackSize(uint64_t Size) { StackSize = Size; }
/// Estimate and return the size of the stack frame.
unsigned estimateStackSize(const MachineFunction &MF) const;
- /// getOffsetAdjustment - Return the correction for frame offsets.
- ///
+ /// Return the correction for frame offsets.
int getOffsetAdjustment() const { return OffsetAdjustment; }
- /// setOffsetAdjustment - Set the correction for frame offsets.
- ///
+ /// Set the correction for frame offsets.
void setOffsetAdjustment(int Adj) { OffsetAdjustment = Adj; }
- /// getMaxAlignment - Return the alignment in bytes that this function must be
- /// aligned to, which is greater than the default stack alignment provided by
- /// the target.
- ///
+ /// Return the alignment in bytes that this function must be aligned to,
+ /// which is greater than the default stack alignment provided by the target.
unsigned getMaxAlignment() const { return MaxAlignment; }
- /// ensureMaxAlignment - Make sure the function is at least Align bytes
- /// aligned.
+ /// Make sure the function is at least Align bytes aligned.
void ensureMaxAlignment(unsigned Align);
- /// AdjustsStack - Return true if this function adjusts the stack -- e.g.,
+ /// Return true if this function adjusts the stack -- e.g.,
/// when calling another function. This is only valid during and after
/// prolog/epilog code insertion.
bool adjustsStack() const { return AdjustsStack; }
void setAdjustsStack(bool V) { AdjustsStack = V; }
- /// hasCalls - Return true if the current function has any function calls.
+ /// Return true if the current function has any function calls.
bool hasCalls() const { return HasCalls; }
void setHasCalls(bool V) { HasCalls = V; }
- /// Returns true if the function contains any stack-adjusting inline assembly.
- bool hasInlineAsmWithSPAdjust() const { return HasInlineAsmWithSPAdjust; }
- void setHasInlineAsmWithSPAdjust(bool B) { HasInlineAsmWithSPAdjust = B; }
+ /// Returns true if the function contains opaque dynamic stack adjustments.
+ bool hasOpaqueSPAdjustment() const { return HasOpaqueSPAdjustment; }
+ void setHasOpaqueSPAdjustment(bool B) { HasOpaqueSPAdjustment = B; }
+
+ /// Returns true if the function calls the llvm.va_start intrinsic.
+ bool hasVAStart() const { return HasVAStart; }
+ void setHasVAStart(bool B) { HasVAStart = B; }
- /// getMaxCallFrameSize - Return the maximum size of a call frame that must be
+ /// Returns true if the function is variadic and contains a musttail call.
+ bool hasMustTailInVarArgFunc() const { return HasMustTailInVarArgFunc; }
+ void setHasMustTailInVarArgFunc(bool B) { HasMustTailInVarArgFunc = B; }
+
+ /// Returns true if the function contains a tail call.
+ bool hasTailCall() const { return HasTailCall; }
+ void setHasTailCall() { HasTailCall = true; }
+
+ /// Return the maximum size of a call frame that must be
/// allocated for an outgoing function call. This is only available if
/// CallFrameSetup/Destroy pseudo instructions are used by the target, and
/// then only during or after prolog/epilog code insertion.
unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; }
void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; }
- /// CreateFixedObject - Create a new object at a fixed location on the stack.
+ /// Create a new object at a fixed location on the stack.
/// All fixed objects should be created before other objects are created for
- /// efficiency. By default, fixed objects are immutable. This returns an
- /// index with a negative value.
- ///
- int CreateFixedObject(uint64_t Size, int64_t SPOffset, bool Immutable);
+ /// efficiency. By default, fixed objects are not pointed to by LLVM IR
+ /// values. This returns an index with a negative value.
+ int CreateFixedObject(uint64_t Size, int64_t SPOffset, bool Immutable,
+ bool isAliased = false);
+ /// Create a spill slot at a fixed location on the stack.
+ /// Returns an index with a negative value.
+ int CreateFixedSpillStackObject(uint64_t Size, int64_t SPOffset);
- /// isFixedObjectIndex - Returns true if the specified index corresponds to a
- /// fixed stack object.
+ /// Returns true if the specified index corresponds to a fixed stack object.
bool isFixedObjectIndex(int ObjectIdx) const {
return ObjectIdx < 0 && (ObjectIdx >= -(int)NumFixedObjects);
}
+ /// Returns true if the specified index corresponds
+ /// to an object that might be pointed to by an LLVM IR value.
+ bool isAliasedObjectIndex(int ObjectIdx) const {
+ assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
+ "Invalid Object Idx!");
+ return Objects[ObjectIdx+NumFixedObjects].isAliased;
+ }
+
/// isImmutableObjectIndex - Returns true if the specified index corresponds
/// to an immutable object.
bool isImmutableObjectIndex(int ObjectIdx) const {
+ // Tail calling functions can clobber their function arguments.
+ if (HasTailCall)
+ return false;
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
return Objects[ObjectIdx+NumFixedObjects].isImmutable;
}
- /// isSpillSlotObjectIndex - Returns true if the specified index corresponds
- /// to a spill slot..
+ /// Returns true if the specified index corresponds to a spill slot.
bool isSpillSlotObjectIndex(int ObjectIdx) const {
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
return Objects[ObjectIdx+NumFixedObjects].isSpillSlot;
}
- /// isDeadObjectIndex - Returns true if the specified index corresponds to
- /// a dead object.
+ /// Returns true if the specified index corresponds to a dead object.
bool isDeadObjectIndex(int ObjectIdx) const {
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
return Objects[ObjectIdx+NumFixedObjects].Size == ~0ULL;
}
- /// CreateStackObject - Create a new statically sized stack object, returning
+ /// Returns true if the specified index corresponds to a variable sized
+ /// object.
+ bool isVariableSizedObjectIndex(int ObjectIdx) const {
+ assert(unsigned(ObjectIdx + NumFixedObjects) < Objects.size() &&
+ "Invalid Object Idx!");
+ return Objects[ObjectIdx + NumFixedObjects].Size == 0;
+ }
+
+ /// Create a new statically sized stack object, returning
/// a nonnegative identifier to represent it.
- ///
int CreateStackObject(uint64_t Size, unsigned Alignment, bool isSS,
const AllocaInst *Alloca = nullptr);
- /// CreateSpillStackObject - Create a new statically sized stack object that
- /// represents a spill slot, returning a nonnegative identifier to represent
- /// it.
- ///
+ /// Create a new statically sized stack object that represents a spill slot,
+ /// returning a nonnegative identifier to represent it.
int CreateSpillStackObject(uint64_t Size, unsigned Alignment);
- /// RemoveStackObject - Remove or mark dead a statically sized stack object.
- ///
+ /// Remove or mark dead a statically sized stack object.
void RemoveStackObject(int ObjectIdx) {
// Mark it dead.
Objects[ObjectIdx+NumFixedObjects].Size = ~0ULL;
}
- /// CreateVariableSizedObject - Notify the MachineFrameInfo object that a
- /// variable sized object has been created. This must be created whenever a
- /// variable sized object is created, whether or not the index returned is
- /// actually used.
- ///
+ /// Notify the MachineFrameInfo object that a variable sized object has been
+ /// created. This must be created whenever a variable sized object is
+ /// created, whether or not the index returned is actually used.
int CreateVariableSizedObject(unsigned Alignment, const AllocaInst *Alloca);
- /// getCalleeSavedInfo - Returns a reference to call saved info vector for the
- /// current function.
+ /// Returns a reference to call saved info vector for the current function.
const std::vector<CalleeSavedInfo> &getCalleeSavedInfo() const {
return CSInfo;
}
- /// setCalleeSavedInfo - Used by prolog/epilog inserter to set the function's
- /// callee saved information.
+ /// Used by prolog/epilog inserter to set the function's callee saved
+ /// information.
void setCalleeSavedInfo(const std::vector<CalleeSavedInfo> &CSI) {
CSInfo = CSI;
}
- /// isCalleeSavedInfoValid - Has the callee saved info been calculated yet?
+ /// Has the callee saved info been calculated yet?
bool isCalleeSavedInfoValid() const { return CSIValid; }
void setCalleeSavedInfoValid(bool v) { CSIValid = v; }
- /// getPristineRegs - Return a set of physical registers that are pristine on
- /// entry to the MBB.
+ MachineBasicBlock *getSavePoint() const { return Save; }
+ void setSavePoint(MachineBasicBlock *NewSave) { Save = NewSave; }
+ MachineBasicBlock *getRestorePoint() const { return Restore; }
+ void setRestorePoint(MachineBasicBlock *NewRestore) { Restore = NewRestore; }
+
+ /// Return a set of physical registers that are pristine.
///
/// Pristine registers hold a value that is useless to the current function,
- /// but that must be preserved - they are callee saved registers that have not
- /// been saved yet.
+ /// but that must be preserved - they are callee saved registers that are not
+ /// saved.
///
/// Before the PrologueEpilogueInserter has placed the CSR spill code, this
/// method always returns an empty set.
- BitVector getPristineRegs(const MachineBasicBlock *MBB) const;
+ BitVector getPristineRegs(const MachineFunction &MF) const;
- /// print - Used by the MachineFunction printer to print information about
- /// stack objects. Implemented in MachineFunction.cpp
- ///
+ /// Used by the MachineFunction printer to print information about
+ /// stack objects. Implemented in MachineFunction.cpp.
void print(const MachineFunction &MF, raw_ostream &OS) const;
/// dump - Print the function to stderr.
projects / oota-llvm.git / blobdiff