#ifndef LLVM_CODEGEN_MACHINEFRAMEINFO_H
#define LLVM_CODEGEN_MACHINEFRAMEINFO_H
-#include "llvm/ADT/BitVector.h"
-#include "llvm/ADT/DenseSet.h"
-#include "llvm/Support/DataTypes.h"
+#include "llvm/ADT/SmallVector.h"
+//#include "llvm/ADT/IndexedMap.h"
+#include "llvm/System/DataTypes.h"
#include <cassert>
#include <vector>
class TargetData;
class TargetRegisterClass;
class Type;
-class MachineModuleInfo;
class MachineFunction;
class MachineBasicBlock;
class TargetFrameInfo;
+class BitVector;
/// The CalleeSavedInfo class tracks the information need to locate where a
-/// callee saved register in the current frame.
+/// callee saved register in the current frame.
class CalleeSavedInfo {
-
-private:
unsigned Reg;
- const TargetRegisterClass *RegClass;
int FrameIdx;
-
+
public:
- CalleeSavedInfo(unsigned R, const TargetRegisterClass *RC, int FI = 0)
- : Reg(R)
- , RegClass(RC)
- , FrameIdx(FI)
- {}
-
+ explicit CalleeSavedInfo(unsigned R, int FI = 0)
+ : Reg(R), FrameIdx(FI) {}
+
// Accessors.
unsigned getReg() const { return Reg; }
- const TargetRegisterClass *getRegClass() const { return RegClass; }
int getFrameIdx() const { return FrameIdx; }
void setFrameIdx(int FI) { FrameIdx = FI; }
};
// StackObject - Represent a single object allocated on the stack.
struct StackObject {
+ // SPOffset - 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;
+
// The size of this object on the stack. 0 means a variable sized object,
// ~0ULL means a dead object.
uint64_t Size;
// default, fixed objects are immutable unless marked otherwise.
bool isImmutable;
- // SPOffset - 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;
-
- StackObject(uint64_t Sz, unsigned Al, int64_t SP = 0, bool IM = false)
- : Size(Sz), Alignment(Al), isImmutable(IM), SPOffset(SP) {}
+ // isSpillSlot - If true the stack object is used as spill slot. It
+ // cannot alias any other memory objects.
+ bool isSpillSlot;
+
+ // MayNeedSP - If true the stack object triggered the creation of the stack
+ // protector. We should allocate this object right after the stack
+ // protector.
+ bool MayNeedSP;
+
+ // PreAllocated - If true, the object was mapped into the local frame
+ // block and doesn't need additional handling for allocation beyond that.
+ bool PreAllocated;
+
+ StackObject(uint64_t Sz, unsigned Al, int64_t SP, bool IM,
+ bool isSS, bool NSP)
+ : SPOffset(SP), Size(Sz), Alignment(Al), isImmutable(IM),
+ isSpillSlot(isSS), MayNeedSP(NSP), PreAllocated(false) {}
};
/// Objects - The list of stack objects allocated...
/// to builtin \@llvm.frameaddress.
bool FrameAddressTaken;
+ /// ReturnAddressTaken - This boolean keeps track of whether there is a call
+ /// to builtin \@llvm.returnaddress.
+ bool ReturnAddressTaken;
+
/// StackSize - 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
- /// have the actual offset from the stack/frame pointer. The calculation is
- /// MFI->getObjectOffset(Index) + StackSize - TFI.getOffsetOfLocalArea() +
- /// OffsetAdjustment. If OffsetAdjustment is zero (default) then offsets are
- /// away from TOS. If OffsetAdjustment == StackSize then offsets are toward
- /// TOS.
+ /// 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
+ /// SP then OffsetAdjustment is zero; if FP is used, OffsetAdjustment is set
+ /// to the distance between the initial SP and the value in FP. For many
+ /// targets, this value is only used when generating debug info (via
+ /// TargetRegisterInfo::getFrameIndexOffset); when generating code, the
+ /// corresponding adjustments are performed directly.
int OffsetAdjustment;
-
- /// MaxAlignment - The prolog/epilog code inserter may process objects
+
+ /// 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
+ /// 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;
- /// HasCalls - Set to true if this function has any function calls. This is
- /// only valid during and after prolog/epilog code insertion.
+ /// AdjustsStack - 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.
bool HasCalls;
/// StackProtectorIdx - The frame index for the stack protector.
/// insertion.
///
unsigned MaxCallFrameSize;
-
+
/// CSInfo - 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
/// CSIValid - Has CSInfo been set yet?
bool CSIValid;
- /// MMI - This field is set (via setMachineModuleInfo) by a module info
- /// consumer (ex. DwarfWriter) to indicate that frame layout information
- /// should be acquired. Typically, it's the responsibility of the target's
- /// TargetRegisterInfo prologue/epilogue emitting code to inform
- /// MachineModuleInfo of frame layouts.
- MachineModuleInfo *MMI;
-
+ /// SpillObjects - A vector indicating which frame indices refer to
+ /// spill slots.
+ SmallVector<bool, 8> SpillObjects;
+
/// TargetFrameInfo - Target information about frame layout.
///
const TargetFrameInfo &TFI;
+
+ /// LocalFrameObjects - 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.
+ int64_t LocalFrameSize;
+
+ /// LocalFrameBaseOffset - The base offset from the stack pointer at
+ /// function entry of the local frame blob. Set by PEI for use by
+ /// target in eliminateFrameIndex().
+ int64_t LocalFrameBaseOffset;
+
+ /// Required alignment of the local object blob, which is the strictest
+ /// alignment of any object in it.
+ unsigned LocalFrameMaxAlign;
+
+ /// Whether the local object blob needs to be allocated together. If not,
+ /// PEI should ignore the isPreAllocated flags on the stack objects and
+ /// just allocate them normally.
+ bool UseLocalStackAllocationBlock;
+
public:
- explicit MachineFrameInfo(const TargetFrameInfo &tfi) : TFI(tfi) {
+ explicit MachineFrameInfo(const TargetFrameInfo &tfi) : TFI(tfi) {
StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0;
HasVarSizedObjects = false;
FrameAddressTaken = false;
+ ReturnAddressTaken = false;
+ AdjustsStack = false;
HasCalls = false;
StackProtectorIdx = -1;
MaxCallFrameSize = 0;
CSIValid = false;
- MMI = 0;
+ LocalFrameSize = 0;
+ LocalFrameBaseOffset = 0;
+ LocalFrameMaxAlign = 0;
}
/// hasStackObjects - Return true if there are any stack objects in this
bool isFrameAddressTaken() const { return FrameAddressTaken; }
void setFrameAddressIsTaken(bool T) { FrameAddressTaken = T; }
+ /// isReturnAddressTaken - 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; }
+
/// getObjectIndexBegin - Return the minimum frame object index.
///
int getObjectIndexBegin() const { return -NumFixedObjects; }
///
int getObjectIndexEnd() const { return (int)Objects.size()-NumFixedObjects; }
- /// getNumFixedObjects() - Return the number of fixed objects.
+ /// getNumFixedObjects - Return the number of fixed objects.
unsigned getNumFixedObjects() const { return NumFixedObjects; }
- /// getNumObjects() - Return the number of objects.
+ /// getNumObjects - Return the number of objects.
///
unsigned getNumObjects() const { return Objects.size(); }
+ /// mapLocalFrameObject - 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) {
+ 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(); }
+
+ /// setLocalFrameBaseOffset - Set the base SP offset of the local frame
+ /// blob.
+ void setLocalFrameBaseOffset(int64_t o) { LocalFrameBaseOffset = o; }
+
+ /// getLocalFrameBaseOffset - Get the base SP offset of the local frame
+ /// blob.
+ int64_t getLocalFrameBaseOffset() const { return LocalFrameBaseOffset; }
+
+ /// setLocalFrameSize - Set the size of the local object blob.
+ void setLocalFrameSize(int64_t sz) { LocalFrameSize = sz; }
+
+ /// getLocalFrameSize - Get the size of the local object blob.
+ int64_t getLocalFrameSize() const { return LocalFrameSize; }
+
+ /// setLocalFrameMaxAlign - 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.
+ unsigned getLocalFrameMaxAlign() { 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;}
+
+ /// setUseLocalStackAllocationBlock - Set whether the local allocation blob
+ /// should be allocated together or let PEI allocate the locals in it
+ /// directly.
+ void setUseLocalStackAllocationBlock(bool v) {
+ UseLocalStackAllocationBlock = v;
+ }
+
+ /// isObjectPreAllocated - 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.
///
int64_t getObjectSize(int ObjectIdx) const {
assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
"Invalid Object Idx!");
Objects[ObjectIdx+NumFixedObjects].Alignment = Align;
+ MaxAlignment = std::max(MaxAlignment, Align);
+ }
+
+ /// NeedsStackProtector - Returns true if the object may need stack
+ /// protectors.
+ bool MayNeedStackProtector(int ObjectIdx) const {
+ assert(unsigned(ObjectIdx+NumFixedObjects) < Objects.size() &&
+ "Invalid Object Idx!");
+ return Objects[ObjectIdx+NumFixedObjects].MayNeedSP;
}
/// getObjectOffset - Return the assigned stack offset of the specified object
/// setStackSize - Set the size of the stack...
///
void setStackSize(uint64_t Size) { StackSize = Size; }
-
+
/// getOffsetAdjustment - Return the correction for frame offsets.
///
int getOffsetAdjustment() const { return OffsetAdjustment; }
-
+
/// setOffsetAdjustment - 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
+ /// 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.
///
unsigned getMaxAlignment() const { return MaxAlignment; }
-
+
/// setMaxAlignment - Set the preferred alignment.
///
void setMaxAlignment(unsigned Align) { MaxAlignment = Align; }
-
- /// hasCalls - Return true if the current function has no function calls.
- /// This is only valid during or after prolog/epilog code emission.
- ///
+
+ /// AdjustsStack - 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.
bool hasCalls() const { return HasCalls; }
void setHasCalls(bool V) { HasCalls = V; }
/// 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 = true);
-
-
+ int CreateFixedObject(uint64_t Size, int64_t SPOffset, bool Immutable);
+
+
/// isFixedObjectIndex - Returns true if the specified index corresponds to a
/// fixed stack object.
bool isFixedObjectIndex(int ObjectIdx) const {
return Objects[ObjectIdx+NumFixedObjects].isImmutable;
}
+ /// isSpillSlotObjectIndex - 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.
bool isDeadObjectIndex(int ObjectIdx) const {
/// CreateStackObject - Create a new statically sized stack object, returning
/// a nonnegative identifier to represent it.
///
- int CreateStackObject(uint64_t Size, unsigned Alignment) {
+ int CreateStackObject(uint64_t Size, unsigned Alignment, bool isSS,
+ bool MayNeedSP = false) {
assert(Size != 0 && "Cannot allocate zero size stack objects!");
- Objects.push_back(StackObject(Size, Alignment));
- return (int)Objects.size()-NumFixedObjects-1;
+ Objects.push_back(StackObject(Size, Alignment, 0, false, isSS, MayNeedSP));
+ int Index = (int)Objects.size() - NumFixedObjects - 1;
+ assert(Index >= 0 && "Bad frame index!");
+ MaxAlignment = std::max(MaxAlignment, Alignment);
+ return Index;
+ }
+
+ /// CreateSpillStackObject - 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) {
+ CreateStackObject(Size, Alignment, true, false);
+ int Index = (int)Objects.size() - NumFixedObjects - 1;
+ MaxAlignment = std::max(MaxAlignment, Alignment);
+ return Index;
}
/// RemoveStackObject - Remove or mark dead a statically sized stack object.
/// variable sized object is created, whether or not the index returned is
/// actually used.
///
- int CreateVariableSizedObject() {
+ int CreateVariableSizedObject(unsigned Alignment) {
HasVarSizedObjects = true;
- Objects.push_back(StackObject(0, 1));
+ Objects.push_back(StackObject(0, Alignment, 0, false, false, true));
+ MaxAlignment = std::max(MaxAlignment, Alignment);
return (int)Objects.size()-NumFixedObjects-1;
}
-
+
/// getCalleeSavedInfo - Returns a reference to call saved info vector for the
/// current function.
const std::vector<CalleeSavedInfo> &getCalleeSavedInfo() const {
/// setCalleeSavedInfo - Used by prolog/epilog inserter to set the function's
/// callee saved information.
- void setCalleeSavedInfo(const std::vector<CalleeSavedInfo> &CSI) {
+ void setCalleeSavedInfo(const std::vector<CalleeSavedInfo> &CSI) {
CSInfo = CSI;
}
/// method always returns an empty set.
BitVector getPristineRegs(const MachineBasicBlock *MBB) const;
- /// getMachineModuleInfo - Used by a prologue/epilogue
- /// emitter (TargetRegisterInfo) to provide frame layout information.
- MachineModuleInfo *getMachineModuleInfo() const { return MMI; }
-
- /// setMachineModuleInfo - Used by a meta info consumer (DwarfWriter) to
- /// indicate that frame layout information should be gathered.
- void setMachineModuleInfo(MachineModuleInfo *mmi) { MMI = mmi; }
-
/// print - Used by the MachineFunction printer to print information about
- /// stack objects. Implemented in MachineFunction.cpp
+ /// stack objects. Implemented in MachineFunction.cpp
///
void print(const MachineFunction &MF, raw_ostream &OS) const;
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