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a3d7e7e900
be saved/restored in the prolog/epilog. We need to do this iff something in the function stores into it. llvm-svn: 58116
105 lines
3.9 KiB
C++
105 lines
3.9 KiB
C++
//===-- PPCMachineFunctionInfo.h - Private data used for PowerPC --*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the PowerPC specific subclass of MachineFunctionInfo.
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//
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//===----------------------------------------------------------------------===//
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#ifndef PPC_MACHINE_FUNCTION_INFO_H
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#define PPC_MACHINE_FUNCTION_INFO_H
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#include "llvm/CodeGen/MachineFunction.h"
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namespace llvm {
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/// PPCFunctionInfo - This class is derived from MachineFunction private
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/// PowerPC target-specific information for each MachineFunction.
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class PPCFunctionInfo : public MachineFunctionInfo {
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private:
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/// FramePointerSaveIndex - Frame index of where the old frame pointer is
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/// stored. Also used as an anchor for instructions that need to be altered
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/// when using frame pointers (dyna_add, dyna_sub.)
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int FramePointerSaveIndex;
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/// ReturnAddrSaveIndex - Frame index of where the return address is stored.
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///
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int ReturnAddrSaveIndex;
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/// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current
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/// function. This is only valid after the initial scan of the function by
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/// PEI.
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bool MustSaveLR;
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/// SpillsCR - Indicates whether CR is spilled in the current function.
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bool SpillsCR;
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/// LRStoreRequired - The bool indicates whether there is some explicit use of
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/// the LR/LR8 stack slot that is not obvious from scanning the code. This
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/// requires that the code generator produce a store of LR to the stack on
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/// entry, even though LR may otherwise apparently not be used.
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bool LRStoreRequired;
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/// MinReservedArea - This is the frame size that is at least reserved in a
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/// potential caller (parameter+linkage area).
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unsigned MinReservedArea;
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/// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
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/// amount the stack pointer is adjusted to make the frame bigger for tail
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/// calls. Used for creating an area before the register spill area.
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int TailCallSPDelta;
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/// HasFastCall - Does this function contain a fast call. Used to determine
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/// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
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bool HasFastCall;
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public:
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PPCFunctionInfo(MachineFunction &MF)
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: FramePointerSaveIndex(0),
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ReturnAddrSaveIndex(0),
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SpillsCR(false),
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LRStoreRequired(false),
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MinReservedArea(0),
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TailCallSPDelta(0),
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HasFastCall(false) {}
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int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
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void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
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int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
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void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
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unsigned getMinReservedArea() const { return MinReservedArea; }
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void setMinReservedArea(unsigned size) { MinReservedArea = size; }
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int getTailCallSPDelta() const { return TailCallSPDelta; }
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void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
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/// MustSaveLR - This is set when the prolog/epilog inserter does its initial
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/// scan of the function. It is true if the LR/LR8 register is ever explicitly
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/// defined/clobbered in the machine function (e.g. by calls and movpctolr,
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/// which is used in PIC generation), or if the LR stack slot is explicitly
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/// referenced by builtin_return_address.
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void setMustSaveLR(bool U) { MustSaveLR = U; }
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bool mustSaveLR() const { return MustSaveLR; }
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void setSpillsCR() { SpillsCR = true; }
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bool isCRSpilled() const { return SpillsCR; }
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void setLRStoreRequired() { LRStoreRequired = true; }
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bool isLRStoreRequired() const { return LRStoreRequired; }
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void setHasFastCall() { HasFastCall = true; }
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bool hasFastCall() const { return HasFastCall;}
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};
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} // end of namespace llvm
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#endif
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