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To accommodate frame layouts that have both fixed and scalable objects on the stack, describing a stack location or offset using a pointer + uint64_t is not sufficient. For this reason, we've introduced the StackOffset class, which models both the fixed- and scalable sized offsets. The TargetFrameLowering::getFrameIndexReference is made to return a StackOffset, so that this can be used in other interfaces, such as to eliminate frame indices in PEI or to emit Debug locations for variables on the stack. This patch is purely mechanical and doesn't change the behaviour of how the result of this function is used for fixed-sized offsets. The patch adds various checks to assert that the offset has no scalable component, as frame offsets with a scalable component are not yet supported in various places. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D90018
69 lines
2.5 KiB
C++
69 lines
2.5 KiB
C++
//===-- SparcFrameLowering.h - Define frame lowering for Sparc --*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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//
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H
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#define LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H
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#include "Sparc.h"
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#include "llvm/CodeGen/TargetFrameLowering.h"
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#include "llvm/Support/TypeSize.h"
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namespace llvm {
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class SparcSubtarget;
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class SparcFrameLowering : public TargetFrameLowering {
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public:
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explicit SparcFrameLowering(const SparcSubtarget &ST);
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/// emitProlog/emitEpilog - These methods insert prolog and epilog code into
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/// the function.
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void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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MachineBasicBlock::iterator
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eliminateCallFramePseudoInstr(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) const override;
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bool hasReservedCallFrame(const MachineFunction &MF) const override;
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bool hasFP(const MachineFunction &MF) const override;
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void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
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RegScavenger *RS = nullptr) const override;
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StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
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Register &FrameReg) const override;
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/// targetHandlesStackFrameRounding - Returns true if the target is
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/// responsible for rounding up the stack frame (probably at emitPrologue
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/// time).
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bool targetHandlesStackFrameRounding() const override { return true; }
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private:
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// Remap input registers to output registers for leaf procedure.
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void remapRegsForLeafProc(MachineFunction &MF) const;
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// Returns true if MF is a leaf procedure.
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bool isLeafProc(MachineFunction &MF) const;
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// Emits code for adjusting SP in function prologue/epilogue.
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void emitSPAdjustment(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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int NumBytes, unsigned ADDrr, unsigned ADDri) const;
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};
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} // End llvm namespace
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#endif
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