46 lines
1.7 KiB
C++
46 lines
1.7 KiB
C++
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//===----- TargetFrameLoweringImpl.cpp - Implement target frame interface --==//
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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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// Implements the layout of a stack frame on the target machine.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include <cstdlib>
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using namespace llvm;
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TargetFrameLowering::~TargetFrameLowering() {
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}
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/// getFrameIndexOffset - Returns the displacement from the frame register to
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/// the stack frame of the specified index. This is the default implementation
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/// which is overridden for some targets.
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int TargetFrameLowering::getFrameIndexOffset(const MachineFunction &MF,
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int FI) const {
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const MachineFrameInfo *MFI = MF.getFrameInfo();
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return MFI->getObjectOffset(FI) + MFI->getStackSize() -
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getOffsetOfLocalArea() + MFI->getOffsetAdjustment();
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}
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int TargetFrameLowering::getFrameIndexReference(const MachineFunction &MF,
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int FI, unsigned &FrameReg) const {
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const TargetRegisterInfo *RI = MF.getTarget().getRegisterInfo();
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// By default, assume all frame indices are referenced via whatever
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// getFrameRegister() says. The target can override this if it's doing
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// something different.
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FrameReg = RI->getFrameRegister(MF);
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return getFrameIndexOffset(MF, FI);
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}
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