#define LLVM_TARGET_TARGETFRAMELOWERING_H
#include "llvm/CodeGen/MachineBasicBlock.h"
-
#include <utility>
#include <vector>
namespace llvm {
class CalleeSavedInfo;
class MachineFunction;
- class MachineBasicBlock;
- class MachineMove;
class RegScavenger;
/// Information about stack frame layout on the target. It holds the direction
unsigned StackAlignment;
unsigned TransientStackAlignment;
int LocalAreaOffset;
+ bool StackRealignable;
public:
TargetFrameLowering(StackDirection D, unsigned StackAl, int LAO,
- unsigned TransAl = 1)
+ unsigned TransAl = 1, bool StackReal = true)
: StackDir(D), StackAlignment(StackAl), TransientStackAlignment(TransAl),
- LocalAreaOffset(LAO) {}
+ LocalAreaOffset(LAO), StackRealignable(StackReal) {}
virtual ~TargetFrameLowering();
return TransientStackAlignment;
}
+ /// isStackRealignable - This method returns whether the stack can be
+ /// realigned.
+ bool isStackRealignable() const {
+ return StackRealignable;
+ }
+
/// 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; }
+
/// 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.
virtual void emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const = 0;
+ /// 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) 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) 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
return hasReservedCallFrame(MF) || hasFP(MF);
}
- /// getInitialFrameState - Returns a list of machine moves that are assumed
- /// on entry to all functions. Note that LabelID is ignored (assumed to be
- /// the beginning of the function.)
- virtual void getInitialFrameState(std::vector<MachineMove> &Moves) const;
-
/// getFrameIndexOffset - Returns the displacement from the frame register to
/// the stack frame of the specified index.
virtual int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
/// finalized. Once the frame is finalized, MO_FrameIndex operands are
/// replaced with direct constants. This method is optional.
///
- virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
+ virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF,
+ RegScavenger *RS = NULL) const {
+ }
+
+ /// eliminateCallFramePseudoInstr - 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.
+ ///
+ virtual void
+ eliminateCallFramePseudoInstr(MachineFunction &MF,
+ MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI) const {
+ llvm_unreachable("Call Frame Pseudo Instructions do not exist on this "
+ "target!");
}
};