1 //===-- PPCMachineFunctionInfo.h - Private data used for PowerPC --*- C++ -*-=//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the PowerPC specific subclass of MachineFunctionInfo.
12 //===----------------------------------------------------------------------===//
14 #ifndef PPC_MACHINE_FUNCTION_INFO_H
15 #define PPC_MACHINE_FUNCTION_INFO_H
17 #include "llvm/CodeGen/MachineFunction.h"
21 /// PPCFunctionInfo - This class is derived from MachineFunction private
22 /// PowerPC target-specific information for each MachineFunction.
23 class PPCFunctionInfo : public MachineFunctionInfo {
25 /// FramePointerSaveIndex - Frame index of where the old frame pointer is
26 /// stored. Also used as an anchor for instructions that need to be altered
27 /// when using frame pointers (dyna_add, dyna_sub.)
28 int FramePointerSaveIndex;
30 /// ReturnAddrSaveIndex - Frame index of where the return address is stored.
32 int ReturnAddrSaveIndex;
34 /// UsesLR - Indicates whether LR is used in the current function. This is
35 /// only valid after the initial scan of the function by PEI.
38 /// SpillsCR - Indicates whether CR is spilled in the current function.
41 /// LRStoreRequired - The bool indicates whether there is some explicit use of
42 /// the LR/LR8 stack slot that is not obvious from scanning the code. This
43 /// requires that the code generator produce a store of LR to the stack on
44 /// entry, even though LR may otherwise apparently not be used.
47 /// MinReservedArea - This is the frame size that is at least reserved in a
48 /// potential caller (parameter+linkage area).
49 unsigned MinReservedArea;
51 /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
52 /// amount the stack pointer is adjusted to make the frame bigger for tail
53 /// calls. Used for creating an area before the register spill area.
56 /// HasFastCall - Does this function contain a fast call. Used to determine
57 /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
61 PPCFunctionInfo(MachineFunction &MF)
62 : FramePointerSaveIndex(0),
63 ReturnAddrSaveIndex(0),
65 LRStoreRequired(false),
70 int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
71 void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
73 int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
74 void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
76 unsigned getMinReservedArea() const { return MinReservedArea; }
77 void setMinReservedArea(unsigned size) { MinReservedArea = size; }
79 int getTailCallSPDelta() const { return TailCallSPDelta; }
80 void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
82 /// UsesLR - This is set when the prolog/epilog inserter does its initial scan
83 /// of the function, it is true if the LR/LR8 register is ever explicitly
84 /// accessed/clobbered in the machine function (e.g. by calls and movpctolr,
85 /// which is used in PIC generation).
86 void setUsesLR(bool U) { UsesLR = U; }
87 bool usesLR() const { return UsesLR; }
89 void setSpillsCR() { SpillsCR = true; }
90 bool isCRSpilled() const { return SpillsCR; }
92 void setLRStoreRequired() { LRStoreRequired = true; }
93 bool isLRStoreRequired() const { return LRStoreRequired; }
95 void setHasFastCall() { HasFastCall = true; }
96 bool hasFastCall() const { return HasFastCall;}
99 } // end of namespace llvm