//===-- MBlazeMachineFunctionInfo.h - Private data --------------*- 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 MBlaze specific subclass of MachineFunctionInfo. // //===----------------------------------------------------------------------===// #ifndef MBLAZE_MACHINE_FUNCTION_INFO_H #define MBLAZE_MACHINE_FUNCTION_INFO_H #include "llvm/ADT/DenseMap.h" #include "llvm/ADT/SmallVector.h" #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineFunction.h" namespace llvm { /// MBlazeFunctionInfo - This class is derived from MachineFunction private /// MBlaze target-specific information for each MachineFunction. class MBlazeFunctionInfo : public MachineFunctionInfo { virtual void anchor(); /// Holds for each function where on the stack the Frame Pointer must be /// saved. This is used on Prologue and Epilogue to emit FP save/restore int FPStackOffset; /// Holds for each function where on the stack the Return Address must be /// saved. This is used on Prologue and Epilogue to emit RA save/restore int RAStackOffset; /// MBlazeFIHolder - Holds a FrameIndex and it's Stack Pointer Offset struct MBlazeFIHolder { int FI; int SPOffset; MBlazeFIHolder(int FrameIndex, int StackPointerOffset) : FI(FrameIndex), SPOffset(StackPointerOffset) {} }; /// When PIC is used the GP must be saved on the stack on the function /// prologue and must be reloaded from this stack location after every /// call. A reference to its stack location and frame index must be kept /// to be used on emitPrologue and processFunctionBeforeFrameFinalized. MBlazeFIHolder GPHolder; /// On LowerFormalArguments the stack size is unknown, so the Stack /// Pointer Offset calculation of "not in register arguments" must be /// postponed to emitPrologue. SmallVector<MBlazeFIHolder, 16> FnLoadArgs; bool HasLoadArgs; // When VarArgs, we must write registers back to caller stack, preserving // on register arguments. Since the stack size is unknown on // LowerFormalArguments, the Stack Pointer Offset calculation must be // postponed to emitPrologue. SmallVector<MBlazeFIHolder, 4> FnStoreVarArgs; bool HasStoreVarArgs; // When determining the final stack layout some of the frame indexes may // be replaced by new frame indexes that reside in the caller's stack // frame. The replacements are recorded in this structure. DenseMap<int,int> FIReplacements; /// SRetReturnReg - Some subtargets require that sret lowering includes /// returning the value of the returned struct in a register. This field /// holds the virtual register into which the sret argument is passed. unsigned SRetReturnReg; /// GlobalBaseReg - keeps track of the virtual register initialized for /// use as the global base register. This is used for PIC in some PIC /// relocation models. unsigned GlobalBaseReg; // VarArgsFrameIndex - FrameIndex for start of varargs area. int VarArgsFrameIndex; /// LiveInFI - keeps track of the frame indexes in a callers stack /// frame that are live into a function. SmallVector<int, 16> LiveInFI; public: MBlazeFunctionInfo(MachineFunction& MF) : FPStackOffset(0), RAStackOffset(0), GPHolder(-1,-1), HasLoadArgs(false), HasStoreVarArgs(false), SRetReturnReg(0), GlobalBaseReg(0), VarArgsFrameIndex(0), LiveInFI() {} int getFPStackOffset() const { return FPStackOffset; } void setFPStackOffset(int Off) { FPStackOffset = Off; } int getRAStackOffset() const { return RAStackOffset; } void setRAStackOffset(int Off) { RAStackOffset = Off; } int getGPStackOffset() const { return GPHolder.SPOffset; } int getGPFI() const { return GPHolder.FI; } void setGPStackOffset(int Off) { GPHolder.SPOffset = Off; } void setGPFI(int FI) { GPHolder.FI = FI; } bool needGPSaveRestore() const { return GPHolder.SPOffset != -1; } bool hasLoadArgs() const { return HasLoadArgs; } bool hasStoreVarArgs() const { return HasStoreVarArgs; } void recordLiveIn(int FI) { LiveInFI.push_back(FI); } bool isLiveIn(int FI) { for (unsigned i = 0, e = LiveInFI.size(); i < e; ++i) if (FI == LiveInFI[i]) return true; return false; } const SmallVector<int, 16>& getLiveIn() const { return LiveInFI; } void recordReplacement(int OFI, int NFI) { FIReplacements.insert(std::make_pair(OFI,NFI)); } bool hasReplacement(int OFI) const { return FIReplacements.find(OFI) != FIReplacements.end(); } int getReplacement(int OFI) const { return FIReplacements.lookup(OFI); } void recordLoadArgsFI(int FI, int SPOffset) { if (!HasLoadArgs) HasLoadArgs=true; FnLoadArgs.push_back(MBlazeFIHolder(FI, SPOffset)); } void recordStoreVarArgsFI(int FI, int SPOffset) { if (!HasStoreVarArgs) HasStoreVarArgs=true; FnStoreVarArgs.push_back(MBlazeFIHolder(FI, SPOffset)); } void adjustLoadArgsFI(MachineFrameInfo *MFI) const { if (!hasLoadArgs()) return; for (unsigned i = 0, e = FnLoadArgs.size(); i != e; ++i) MFI->setObjectOffset(FnLoadArgs[i].FI, FnLoadArgs[i].SPOffset); } void adjustStoreVarArgsFI(MachineFrameInfo *MFI) const { if (!hasStoreVarArgs()) return; for (unsigned i = 0, e = FnStoreVarArgs.size(); i != e; ++i) MFI->setObjectOffset(FnStoreVarArgs[i].FI, FnStoreVarArgs[i].SPOffset); } unsigned getSRetReturnReg() const { return SRetReturnReg; } void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; } unsigned getGlobalBaseReg() const { return GlobalBaseReg; } void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; } int getVarArgsFrameIndex() const { return VarArgsFrameIndex; } void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; } }; } // end of namespace llvm #endif // MBLAZE_MACHINE_FUNCTION_INFO_H