X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FCodeGen%2FMachineFrameInfo.h;h=f5a688458d2e65621aa7b36b34101d70d6ede0bc;hb=2f351a5ca7784cdb01586086199789a291d98c50;hp=78898a4a69ef7b31f2ae90253eac6ed41db18ebe;hpb=3f0dbab963197cadb32f70e1ee1a106fe35f5c8e;p=oota-llvm.git diff --git a/include/llvm/CodeGen/MachineFrameInfo.h b/include/llvm/CodeGen/MachineFrameInfo.h index 78898a4a69e..f5a688458d2 100644 --- a/include/llvm/CodeGen/MachineFrameInfo.h +++ b/include/llvm/CodeGen/MachineFrameInfo.h @@ -21,13 +21,16 @@ namespace llvm { class raw_ostream; -class TargetData; +class DataLayout; class TargetRegisterClass; class Type; class MachineFunction; class MachineBasicBlock; class TargetFrameLowering; +class TargetMachine; class BitVector; +class Value; +class AllocaInst; /// The CalleeSavedInfo class tracks the information need to locate where a /// callee saved register is in the current frame. @@ -76,9 +79,9 @@ public: /// @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; @@ -86,124 +89,142 @@ class MachineFrameInfo { // ~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; - // 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; + /// 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, bool NSP) + bool isSS, const AllocaInst *Val, bool A) : SPOffset(SP), Size(Sz), Alignment(Al), isImmutable(IM), - isSpillSlot(isSS), MayNeedSP(NSP), PreAllocated(false) {} + isSpillSlot(isSS), Alloca(Val), PreAllocated(false), isAliased(A) {} }; - /// Objects - The list of stack objects allocated... - /// + /// The alignment of the stack. + unsigned StackAlignment; + + /// Can the stack be realigned. + /// Targets that set this to false don't have the ability to overalign + /// their stack frame, and thus, overaligned allocas are all treated + /// as dynamic allocations and the target must handle them as part + /// of DYNAMIC_STACKALLOC lowering. + /// FIXME: There is room for improvement in this case, in terms of + /// grouping overaligned allocas into a "secondary stack frame" and + /// then only use a single alloca to allocate this frame and only a + /// single virtual register to access it. Currently, without such an + /// optimization, each such alloca gets it's own dynamic + /// realignment. + bool StackRealignable; + + /// The list of stack objects allocated. std::vector 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; - /// StackSize - The prolog/epilog code inserter calculates the final stack + /// This boolean keeps track of whether there is a call + /// to builtin \@llvm.experimental.stackmap. + bool HasStackMap; + + /// This boolean keeps track of whether there is a call + /// to builtin \@llvm.experimental.patchpoint. + bool HasPatchPoint; + + /// 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 /// 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 + /// TargetRegisterInfo::getFrameIndexReference); when generating code, the /// 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. + /// It 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 CSInfo; - /// CSIValid - Has CSInfo been set yet? + /// Has CSInfo been set yet? bool CSIValid; - /// TargetFrameLowering - Target information about frame layout. - /// - const TargetFrameLowering &TFI; - - /// LocalFrameObjects - References to frame indices which are mapped + /// References to frame indices which are mapped /// into the local frame allocation block. SmallVector, 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 @@ -215,16 +236,40 @@ class MachineFrameInfo { /// just allocate them normally. bool UseLocalStackAllocationBlock; - /// After the stack pointer has been restore from the base pointer we - /// use a cached adjusment. Currently only used for x86. - int64_t BPAdj; + /// Whether the "realign-stack" option is on. + bool RealignOption; + + /// 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; public: - explicit MachineFrameInfo(const TargetFrameLowering &tfi) : TFI(tfi) { + explicit MachineFrameInfo(unsigned StackAlign, bool isStackRealign, + bool RealignOpt) + : StackAlignment(StackAlign), StackRealignable(isStackRealign), + RealignOption(RealignOpt) { StackSize = NumFixedObjects = OffsetAdjustment = MaxAlignment = 0; HasVarSizedObjects = false; FrameAddressTaken = false; ReturnAddressTaken = false; + HasStackMap = false; + HasPatchPoint = false; AdjustsStack = false; HasCalls = false; StackProtectorIdx = -1; @@ -234,93 +279,102 @@ public: LocalFrameSize = 0; LocalFrameMaxAlign = 0; UseLocalStackAllocationBlock = false; - BPAdj = 0; + 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; } + bool hasStackProtectorIndex() const { return StackProtectorIdx != -1; } - /// 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; } - /// getObjectIndexBegin - Return the minimum frame object index. - /// + /// 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; } + + /// 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; } + + /// 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(ObjectIndex, Offset)); Objects[ObjectIndex + NumFixedObjects].PreAllocated = true; } - /// getLocalFrameObjectMap - Get the local offset mapping for a for an object - std::pair getLocalFrameObjectMap(int i) { + /// Get the local offset mapping for a for an object. + std::pair 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 @@ -329,30 +383,28 @@ public: 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!"); @@ -367,17 +419,16 @@ public: ensureMaxAlignment(Align); } - /// NeedsStackProtector - Returns true if the object may need stack - /// protectors. - bool MayNeedStackProtector(int ObjectIdx) const { + /// 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() && "Invalid Object Idx!"); - return Objects[ObjectIdx+NumFixedObjects].MayNeedSP; + 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!"); @@ -386,9 +437,8 @@ public: 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!"); @@ -397,47 +447,57 @@ public: 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; } - /// getOffsetAdjustment - Return the correction for frame offsets. - /// + /// Estimate and return the size of the stack frame. + unsigned estimateStackSize(const MachineFunction &MF) const; + + /// 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. - void ensureMaxAlignment(unsigned Align) { - if (MaxAlignment < Align) MaxAlignment = Align; - } + /// 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; } - /// getMaxCallFrameSize - Return the maximum size of a call frame that must be + /// 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; } + + /// 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. @@ -445,128 +505,116 @@ public: 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, - bool MayNeedSP = false) { - assert(Size != 0 && "Cannot allocate zero size stack objects!"); - Objects.push_back(StackObject(Size, Alignment, 0, false, isSS, MayNeedSP)); - int Index = (int)Objects.size() - NumFixedObjects - 1; - assert(Index >= 0 && "Bad frame index!"); - ensureMaxAlignment(Alignment); - return Index; - } + const AllocaInst *Alloca = nullptr); - /// 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; - ensureMaxAlignment(Alignment); - return Index; - } + /// 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. - /// - int CreateVariableSizedObject(unsigned Alignment) { - HasVarSizedObjects = true; - Objects.push_back(StackObject(0, Alignment, 0, false, false, true)); - ensureMaxAlignment(Alignment); - return (int)Objects.size()-NumFixedObjects-1; - } + /// 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 &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 &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; } - /// setBasePtrStackAdjustment - If we're restoring the stack pointer from the - /// base pointer, due to dynamic stack realignment + VLAs, we cache the - /// number of bytes initially allocated for the stack frame. In obscure - /// cases (e.g., tail calls with byval argument and no stack protector), the - /// stack gets adjusted outside of the prolog, but these shouldn't be - /// considered when restoring from the base pointer. Currently, this is only - /// needed for x86. - void setBasePtrStackAdjustment(int64_t adj) { BPAdj = adj; } - int64_t getBasePtrStackAdjustment() const { return BPAdj; } - - /// 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.