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This is part of the work to remove TargetMachine::resetTargetOptions. In this patch, instead of updating global variable NoFramePointerElim in resetTargetOptions, its use in DisableFramePointerElim is replaced with a call to TargetFrameLowering::noFramePointerElim. This function determines on a per-function basis if frame pointer elimination should be disabled. There is no change in functionality except that cl:opt option "disable-fp-elim" can now override function attribute "no-frame-pointer-elim". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238080 91177308-0d34-0410-b5e6-96231b3b80d8
57 lines
2.2 KiB
C++
57 lines
2.2 KiB
C++
//===----- 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/Target/TargetFrameLowering.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/IR/Function.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Target/TargetSubtargetInfo.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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/// The default implementation just looks at attribute "no-frame-pointer-elim".
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bool TargetFrameLowering::noFramePointerElim(const MachineFunction &MF) const {
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auto Attr = MF.getFunction()->getFnAttribute("no-frame-pointer-elim");
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return Attr.getValueAsString() == "true";
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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.getSubtarget().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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bool TargetFrameLowering::needsFrameIndexResolution(
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const MachineFunction &MF) const {
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return MF.getFrameInfo()->hasStackObjects();
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}
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