llvm-6502/lib/Target/Mips/MipsMachineFunction.h
Akira Hatanaka a76220a40c Add methods to MipsFunctionInfo for initializing and accessing the stack frame
object for the global base register.

This is the first of a series of patches which implements long branch expansion
for MIPS.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158427 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-14 01:15:36 +00:00

127 lines
4.3 KiB
C++

//===-- MipsMachineFunctionInfo.h - Private data used for Mips ----*- 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 Mips specific subclass of MachineFunctionInfo.
//
//===----------------------------------------------------------------------===//
#ifndef MIPS_MACHINE_FUNCTION_INFO_H
#define MIPS_MACHINE_FUNCTION_INFO_H
#include "MipsSubtarget.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetMachine.h"
#include <utility>
namespace llvm {
/// MipsFunctionInfo - This class is derived from MachineFunction private
/// Mips target-specific information for each MachineFunction.
class MipsFunctionInfo : public MachineFunctionInfo {
virtual void anchor();
MachineFunction& MF;
/// 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;
// Range of frame object indices.
// InArgFIRange: Range of indices of all frame objects created during call to
// LowerFormalArguments.
// OutArgFIRange: Range of indices of all frame objects created during call to
// LowerCall except for the frame object for restoring $gp.
std::pair<int, int> InArgFIRange, OutArgFIRange;
int GlobalRegFI;
mutable int DynAllocFI; // Frame index of dynamically allocated stack area.
unsigned MaxCallFrameSize;
bool EmitNOAT;
public:
MipsFunctionInfo(MachineFunction& MF)
: MF(MF), SRetReturnReg(0), GlobalBaseReg(0),
VarArgsFrameIndex(0), InArgFIRange(std::make_pair(-1, 0)),
OutArgFIRange(std::make_pair(-1, 0)), GlobalRegFI(0), DynAllocFI(0),
MaxCallFrameSize(0), EmitNOAT(false)
{}
bool isInArgFI(int FI) const {
return FI <= InArgFIRange.first && FI >= InArgFIRange.second;
}
void setLastInArgFI(int FI) { InArgFIRange.second = FI; }
bool isOutArgFI(int FI) const {
return FI <= OutArgFIRange.first && FI >= OutArgFIRange.second;
}
void extendOutArgFIRange(int FirstFI, int LastFI) {
if (!OutArgFIRange.second)
// this must be the first time this function was called.
OutArgFIRange.first = FirstFI;
OutArgFIRange.second = LastFI;
}
bool isGlobalRegFI(int FI) const {
return GlobalRegFI && (FI == GlobalRegFI);
}
int getGlobalRegFI() const {
return GlobalRegFI;
}
int initGlobalRegFI() {
const TargetMachine &TM = MF.getTarget();
unsigned RegSize = TM.getSubtarget<MipsSubtarget>().isABI_N64() ? 8 : 4;
int64_t StackAlignment = TM.getFrameLowering()->getStackAlignment();
uint64_t Offset = RoundUpToAlignment(MaxCallFrameSize, StackAlignment);
GlobalRegFI = MF.getFrameInfo()->CreateFixedObject(RegSize, Offset, true);
return GlobalRegFI;
}
// The first call to this function creates a frame object for dynamically
// allocated stack area.
int getDynAllocFI() const {
if (!DynAllocFI)
DynAllocFI = MF.getFrameInfo()->CreateFixedObject(4, 0, true);
return DynAllocFI;
}
bool isDynAllocFI(int FI) const { return DynAllocFI && DynAllocFI == FI; }
unsigned getSRetReturnReg() const { return SRetReturnReg; }
void setSRetReturnReg(unsigned Reg) { SRetReturnReg = Reg; }
bool globalBaseRegSet() const;
unsigned getGlobalBaseReg();
int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
unsigned getMaxCallFrameSize() const { return MaxCallFrameSize; }
void setMaxCallFrameSize(unsigned S) { MaxCallFrameSize = S; }
bool getEmitNOAT() const { return EmitNOAT; }
void setEmitNOAT() { EmitNOAT = true; }
};
} // end of namespace llvm
#endif // MIPS_MACHINE_FUNCTION_INFO_H