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//===-- PPCMachineFunctionInfo.h - Private data used for PowerPC --*- C++ -*-=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the PowerPC specific subclass of MachineFunctionInfo.
//
//===----------------------------------------------------------------------===//
#ifndef PPC_MACHINE_FUNCTION_INFO_H
#define PPC_MACHINE_FUNCTION_INFO_H
#include "llvm/CodeGen/MachineFunction.h"
namespace llvm {
/// PPCFunctionInfo - This class is derived from MachineFunction private
/// PowerPC target-specific information for each MachineFunction.
class PPCFunctionInfo : public MachineFunctionInfo {
private:
/// FramePointerSaveIndex - Frame index of where the old frame pointer is
/// stored. Also used as an anchor for instructions that need to be altered
/// when using frame pointers (dyna_add, dyna_sub.)
int FramePointerSaveIndex;
/// ReturnAddrSaveIndex - Frame index of where the return address is stored.
///
int ReturnAddrSaveIndex;
/// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current
/// function. This is only valid after the initial scan of the function by
/// PEI.
bool MustSaveLR;
/// SpillsCR - Indicates whether CR is spilled in the current function.
bool SpillsCR;
/// LRStoreRequired - The bool indicates whether there is some explicit use of
/// the LR/LR8 stack slot that is not obvious from scanning the code. This
/// requires that the code generator produce a store of LR to the stack on
/// entry, even though LR may otherwise apparently not be used.
bool LRStoreRequired;
/// MinReservedArea - This is the frame size that is at least reserved in a
/// potential caller (parameter+linkage area).
unsigned MinReservedArea;
/// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
/// amount the stack pointer is adjusted to make the frame bigger for tail
/// calls. Used for creating an area before the register spill area.
int TailCallSPDelta;
/// HasFastCall - Does this function contain a fast call. Used to determine
/// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
bool HasFastCall;
public:
PPCFunctionInfo(MachineFunction &MF)
: FramePointerSaveIndex(0),
ReturnAddrSaveIndex(0),
SpillsCR(false),
LRStoreRequired(false),
MinReservedArea(0),
TailCallSPDelta(0),
HasFastCall(false) {}
int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
unsigned getMinReservedArea() const { return MinReservedArea; }
void setMinReservedArea(unsigned size) { MinReservedArea = size; }
int getTailCallSPDelta() const { return TailCallSPDelta; }
void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
/// MustSaveLR - This is set when the prolog/epilog inserter does its initial
/// scan of the function. It is true if the LR/LR8 register is ever explicitly
/// defined/clobbered in the machine function (e.g. by calls and movpctolr,
/// which is used in PIC generation), or if the LR stack slot is explicitly
/// referenced by builtin_return_address.
void setMustSaveLR(bool U) { MustSaveLR = U; }
bool mustSaveLR() const { return MustSaveLR; }
void setSpillsCR() { SpillsCR = true; }
bool isCRSpilled() const { return SpillsCR; }
void setLRStoreRequired() { LRStoreRequired = true; }
bool isLRStoreRequired() const { return LRStoreRequired; }
void setHasFastCall() { HasFastCall = true; }
bool hasFastCall() const { return HasFastCall;}
};
} // end of namespace llvm
#endif
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