8202a3da3c
All hardware address spaces on AVR can be freely cast between (they keep the same bit pattern). They just aren't dereferenceable when they're in a different address space as they really do point to a separate address space. This is supported in avr-gcc: https://godbolt.org/z/9Gfvhnhv9 avr-gcc also supports the `__memx` address space which is 24 bits. We don't support this address space yet but I've added a safeguard just in case. Differential Revison: https://reviews.llvm.org/D142107
68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
//===-- AVRTargetMachine.h - Define TargetMachine for AVR -------*- 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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// This file declares the AVR specific subclass of TargetMachine.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_AVR_TARGET_MACHINE_H
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#define LLVM_AVR_TARGET_MACHINE_H
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#include "llvm/IR/DataLayout.h"
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#include "llvm/Target/TargetMachine.h"
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#include "AVRFrameLowering.h"
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#include "AVRISelLowering.h"
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#include "AVRInstrInfo.h"
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#include "AVRSelectionDAGInfo.h"
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#include "AVRSubtarget.h"
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#include <optional>
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namespace llvm {
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/// A generic AVR implementation.
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class AVRTargetMachine : public LLVMTargetMachine {
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public:
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AVRTargetMachine(const Target &T, const Triple &TT, StringRef CPU,
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StringRef FS, const TargetOptions &Options,
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std::optional<Reloc::Model> RM,
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std::optional<CodeModel::Model> CM, CodeGenOpt::Level OL,
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bool JIT);
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const AVRSubtarget *getSubtargetImpl() const;
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const AVRSubtarget *getSubtargetImpl(const Function &) const override;
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TargetLoweringObjectFile *getObjFileLowering() const override {
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return this->TLOF.get();
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}
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TargetPassConfig *createPassConfig(PassManagerBase &PM) override;
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MachineFunctionInfo *
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createMachineFunctionInfo(BumpPtrAllocator &Allocator, const Function &F,
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const TargetSubtargetInfo *STI) const override;
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bool isNoopAddrSpaceCast(unsigned SrcAs, unsigned DestAs) const override {
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// While AVR has different address spaces, they are all represented by
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// 16-bit pointers that can be freely casted between (of course, a pointer
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// must be cast back to its original address space to be dereferenceable).
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// To be safe, also check the pointer size in case we implement __memx
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// pointers.
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return getPointerSize(SrcAs) == getPointerSize(DestAs);
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}
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private:
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std::unique_ptr<TargetLoweringObjectFile> TLOF;
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AVRSubtarget SubTarget;
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};
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} // end namespace llvm
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#endif // LLVM_AVR_TARGET_MACHINE_H
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