Import prebuilt clang toolchain for linux.
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+//===-- llvm/CodeGen/TargetFrameLowering.h ----------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Interface to describe the layout of a stack frame on the target machine.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_TARGETFRAMELOWERING_H
+#define LLVM_CODEGEN_TARGETFRAMELOWERING_H
+
+#include "llvm/CodeGen/MachineBasicBlock.h"
+#include <utility>
+#include <vector>
+
+namespace llvm {
+ class BitVector;
+ class CalleeSavedInfo;
+ class MachineFunction;
+ class RegScavenger;
+
+/// Information about stack frame layout on the target. It holds the direction
+/// of stack growth, the known stack alignment on entry to each function, and
+/// the offset to the locals area.
+///
+/// The offset to the local area is the offset from the stack pointer on
+/// function entry to the first location where function data (local variables,
+/// spill locations) can be stored.
+class TargetFrameLowering {
+public:
+ enum StackDirection {
+ StackGrowsUp, // Adding to the stack increases the stack address
+ StackGrowsDown // Adding to the stack decreases the stack address
+ };
+
+ // Maps a callee saved register to a stack slot with a fixed offset.
+ struct SpillSlot {
+ unsigned Reg;
+ int Offset; // Offset relative to stack pointer on function entry.
+ };
+private:
+ StackDirection StackDir;
+ unsigned StackAlignment;
+ unsigned TransientStackAlignment;
+ int LocalAreaOffset;
+ bool StackRealignable;
+public:
+ TargetFrameLowering(StackDirection D, unsigned StackAl, int LAO,
+ unsigned TransAl = 1, bool StackReal = true)
+ : StackDir(D), StackAlignment(StackAl), TransientStackAlignment(TransAl),
+ LocalAreaOffset(LAO), StackRealignable(StackReal) {}
+
+ virtual ~TargetFrameLowering();
+
+ // These methods return information that describes the abstract stack layout
+ // of the target machine.
+
+ /// getStackGrowthDirection - Return the direction the stack grows
+ ///
+ StackDirection getStackGrowthDirection() const { return StackDir; }
+
+ /// getStackAlignment - This method returns the number of bytes to which the
+ /// stack pointer must be aligned on entry to a function. Typically, this
+ /// is the largest alignment for any data object in the target.
+ ///
+ unsigned getStackAlignment() const { return StackAlignment; }
+
+ /// alignSPAdjust - This method aligns the stack adjustment to the correct
+ /// alignment.
+ ///
+ int alignSPAdjust(int SPAdj) const {
+ if (SPAdj < 0) {
+ SPAdj = -alignTo(-SPAdj, StackAlignment);
+ } else {
+ SPAdj = alignTo(SPAdj, StackAlignment);
+ }
+ return SPAdj;
+ }
+
+ /// getTransientStackAlignment - This method returns the number of bytes to
+ /// which the stack pointer must be aligned at all times, even between
+ /// calls.
+ ///
+ unsigned getTransientStackAlignment() const {
+ return TransientStackAlignment;
+ }
+
+ /// isStackRealignable - This method returns whether the stack can be
+ /// realigned.
+ bool isStackRealignable() const {
+ return StackRealignable;
+ }
+
+ /// Return the skew that has to be applied to stack alignment under
+ /// certain conditions (e.g. stack was adjusted before function \p MF
+ /// was called).
+ virtual unsigned getStackAlignmentSkew(const MachineFunction &MF) const;
+
+ /// getOffsetOfLocalArea - This method returns the offset of the local area
+ /// from the stack pointer on entrance to a function.
+ ///
+ int getOffsetOfLocalArea() const { return LocalAreaOffset; }
+
+ /// isFPCloseToIncomingSP - Return true if the frame pointer is close to
+ /// the incoming stack pointer, false if it is close to the post-prologue
+ /// stack pointer.
+ virtual bool isFPCloseToIncomingSP() const { return true; }
+
+ /// assignCalleeSavedSpillSlots - Allows target to override spill slot
+ /// assignment logic. If implemented, assignCalleeSavedSpillSlots() should
+ /// assign frame slots to all CSI entries and return true. If this method
+ /// returns false, spill slots will be assigned using generic implementation.
+ /// assignCalleeSavedSpillSlots() may add, delete or rearrange elements of
+ /// CSI.
+ virtual bool
+ assignCalleeSavedSpillSlots(MachineFunction &MF,
+ const TargetRegisterInfo *TRI,
+ std::vector<CalleeSavedInfo> &CSI) const {
+ return false;
+ }
+
+ /// getCalleeSavedSpillSlots - This method returns a pointer to an array of
+ /// pairs, that contains an entry for each callee saved register that must be
+ /// spilled to a particular stack location if it is spilled.
+ ///
+ /// Each entry in this array contains a <register,offset> pair, indicating the
+ /// fixed offset from the incoming stack pointer that each register should be
+ /// spilled at. If a register is not listed here, the code generator is
+ /// allowed to spill it anywhere it chooses.
+ ///
+ virtual const SpillSlot *
+ getCalleeSavedSpillSlots(unsigned &NumEntries) const {
+ NumEntries = 0;
+ return nullptr;
+ }
+
+ /// targetHandlesStackFrameRounding - Returns true if the target is
+ /// responsible for rounding up the stack frame (probably at emitPrologue
+ /// time).
+ virtual bool targetHandlesStackFrameRounding() const {
+ return false;
+ }
+
+ /// Returns true if the target will correctly handle shrink wrapping.
+ virtual bool enableShrinkWrapping(const MachineFunction &MF) const {
+ return false;
+ }
+
+ /// Returns true if the stack slot holes in the fixed and callee-save stack
+ /// area should be used when allocating other stack locations to reduce stack
+ /// size.
+ virtual bool enableStackSlotScavenging(const MachineFunction &MF) const {
+ return false;
+ }
+
+ /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
+ /// the function.
+ virtual void emitPrologue(MachineFunction &MF,
+ MachineBasicBlock &MBB) const = 0;
+ virtual void emitEpilogue(MachineFunction &MF,
+ MachineBasicBlock &MBB) const = 0;
+
+ /// Replace a StackProbe stub (if any) with the actual probe code inline
+ virtual void inlineStackProbe(MachineFunction &MF,
+ MachineBasicBlock &PrologueMBB) const {}
+
+ /// Adjust the prologue to have the function use segmented stacks. This works
+ /// by adding a check even before the "normal" function prologue.
+ virtual void adjustForSegmentedStacks(MachineFunction &MF,
+ MachineBasicBlock &PrologueMBB) const {}
+
+ /// Adjust the prologue to add Erlang Run-Time System (ERTS) specific code in
+ /// the assembly prologue to explicitly handle the stack.
+ virtual void adjustForHiPEPrologue(MachineFunction &MF,
+ MachineBasicBlock &PrologueMBB) const {}
+
+ /// spillCalleeSavedRegisters - Issues instruction(s) to spill all callee
+ /// saved registers and returns true if it isn't possible / profitable to do
+ /// so by issuing a series of store instructions via
+ /// storeRegToStackSlot(). Returns false otherwise.
+ virtual bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ const std::vector<CalleeSavedInfo> &CSI,
+ const TargetRegisterInfo *TRI) const {
+ return false;
+ }
+
+ /// restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee
+ /// saved registers and returns true if it isn't possible / profitable to do
+ /// so by issuing a series of load instructions via loadRegToStackSlot().
+ /// If it returns true, and any of the registers in CSI is not restored,
+ /// it sets the corresponding Restored flag in CSI to false.
+ /// Returns false otherwise.
+ virtual bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI,
+ std::vector<CalleeSavedInfo> &CSI,
+ const TargetRegisterInfo *TRI) const {
+ return false;
+ }
+
+ /// Return true if the target needs to disable frame pointer elimination.
+ virtual bool noFramePointerElim(const MachineFunction &MF) const;
+
+ /// hasFP - Return true if the specified function should have a dedicated
+ /// frame pointer register. For most targets this is true only if the function
+ /// has variable sized allocas or if frame pointer elimination is disabled.
+ virtual bool hasFP(const MachineFunction &MF) const = 0;
+
+ /// hasReservedCallFrame - Under normal circumstances, when a frame pointer is
+ /// not required, we reserve argument space for call sites in the function
+ /// immediately on entry to the current function. This eliminates the need for
+ /// add/sub sp brackets around call sites. Returns true if the call frame is
+ /// included as part of the stack frame.
+ virtual bool hasReservedCallFrame(const MachineFunction &MF) const {
+ return !hasFP(MF);
+ }
+
+ /// canSimplifyCallFramePseudos - When possible, it's best to simplify the
+ /// call frame pseudo ops before doing frame index elimination. This is
+ /// possible only when frame index references between the pseudos won't
+ /// need adjusting for the call frame adjustments. Normally, that's true
+ /// if the function has a reserved call frame or a frame pointer. Some
+ /// targets (Thumb2, for example) may have more complicated criteria,
+ /// however, and can override this behavior.
+ virtual bool canSimplifyCallFramePseudos(const MachineFunction &MF) const {
+ return hasReservedCallFrame(MF) || hasFP(MF);
+ }
+
+ // needsFrameIndexResolution - Do we need to perform FI resolution for
+ // this function. Normally, this is required only when the function
+ // has any stack objects. However, targets may want to override this.
+ virtual bool needsFrameIndexResolution(const MachineFunction &MF) const;
+
+ /// getFrameIndexReference - This method should return the base register
+ /// and offset used to reference a frame index location. The offset is
+ /// returned directly, and the base register is returned via FrameReg.
+ virtual int getFrameIndexReference(const MachineFunction &MF, int FI,
+ unsigned &FrameReg) const;
+
+ /// Same as \c getFrameIndexReference, except that the stack pointer (as
+ /// opposed to the frame pointer) will be the preferred value for \p
+ /// FrameReg. This is generally used for emitting statepoint or EH tables that
+ /// use offsets from RSP. If \p IgnoreSPUpdates is true, the returned
+ /// offset is only guaranteed to be valid with respect to the value of SP at
+ /// the end of the prologue.
+ virtual int getFrameIndexReferencePreferSP(const MachineFunction &MF, int FI,
+ unsigned &FrameReg,
+ bool IgnoreSPUpdates) const {
+ // Always safe to dispatch to getFrameIndexReference.
+ return getFrameIndexReference(MF, FI, FrameReg);
+ }
+
+ /// This method determines which of the registers reported by
+ /// TargetRegisterInfo::getCalleeSavedRegs() should actually get saved.
+ /// The default implementation checks populates the \p SavedRegs bitset with
+ /// all registers which are modified in the function, targets may override
+ /// this function to save additional registers.
+ /// This method also sets up the register scavenger ensuring there is a free
+ /// register or a frameindex available.
+ virtual void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
+ RegScavenger *RS = nullptr) const;
+
+ /// processFunctionBeforeFrameFinalized - This method is called immediately
+ /// before the specified function's frame layout (MF.getFrameInfo()) is
+ /// finalized. Once the frame is finalized, MO_FrameIndex operands are
+ /// replaced with direct constants. This method is optional.
+ ///
+ virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF,
+ RegScavenger *RS = nullptr) const {
+ }
+
+ virtual unsigned getWinEHParentFrameOffset(const MachineFunction &MF) const {
+ report_fatal_error("WinEH not implemented for this target");
+ }
+
+ /// This method is called during prolog/epilog code insertion to eliminate
+ /// call frame setup and destroy pseudo instructions (but only if the Target
+ /// is using them). It is responsible for eliminating these instructions,
+ /// replacing them with concrete instructions. This method need only be
+ /// implemented if using call frame setup/destroy pseudo instructions.
+ /// Returns an iterator pointing to the instruction after the replaced one.
+ virtual MachineBasicBlock::iterator
+ eliminateCallFramePseudoInstr(MachineFunction &MF,
+ MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI) const {
+ llvm_unreachable("Call Frame Pseudo Instructions do not exist on this "
+ "target!");
+ }
+
+
+ /// Order the symbols in the local stack frame.
+ /// The list of objects that we want to order is in \p objectsToAllocate as
+ /// indices into the MachineFrameInfo. The array can be reordered in any way
+ /// upon return. The contents of the array, however, may not be modified (i.e.
+ /// only their order may be changed).
+ /// By default, just maintain the original order.
+ virtual void
+ orderFrameObjects(const MachineFunction &MF,
+ SmallVectorImpl<int> &objectsToAllocate) const {
+ }
+
+ /// Check whether or not the given \p MBB can be used as a prologue
+ /// for the target.
+ /// The prologue will be inserted first in this basic block.
+ /// This method is used by the shrink-wrapping pass to decide if
+ /// \p MBB will be correctly handled by the target.
+ /// As soon as the target enable shrink-wrapping without overriding
+ /// this method, we assume that each basic block is a valid
+ /// prologue.
+ virtual bool canUseAsPrologue(const MachineBasicBlock &MBB) const {
+ return true;
+ }
+
+ /// Check whether or not the given \p MBB can be used as a epilogue
+ /// for the target.
+ /// The epilogue will be inserted before the first terminator of that block.
+ /// This method is used by the shrink-wrapping pass to decide if
+ /// \p MBB will be correctly handled by the target.
+ /// As soon as the target enable shrink-wrapping without overriding
+ /// this method, we assume that each basic block is a valid
+ /// epilogue.
+ virtual bool canUseAsEpilogue(const MachineBasicBlock &MBB) const {
+ return true;
+ }
+
+ /// Check if given function is safe for not having callee saved registers.
+ /// This is used when interprocedural register allocation is enabled.
+ static bool isSafeForNoCSROpt(const Function &F) {
+ if (!F.hasLocalLinkage() || F.hasAddressTaken() ||
+ !F.hasFnAttribute(Attribute::NoRecurse))
+ return false;
+ // Function should not be optimized as tail call.
+ for (const User *U : F.users())
+ if (auto CS = ImmutableCallSite(U))
+ if (CS.isTailCall())
+ return false;
+ return true;
+ }
+};
+
+} // End llvm namespace
+
+#endif