bb3f5e1fed
Following discussions in #110443, and the following earlier discussions in https://lists.llvm.org/pipermail/llvm-dev/2017-October/117907.html, https://reviews.llvm.org/D38482, https://reviews.llvm.org/D38489, this PR attempts to overhaul the `TargetMachine` and `LLVMTargetMachine` interface classes. More specifically: 1. Makes `TargetMachine` the only class implemented under `TargetMachine.h` in the `Target` library. 2. `TargetMachine` contains target-specific interface functions that relate to IR/CodeGen/MC constructs, whereas before (at least on paper) it was supposed to have only IR/MC constructs. Any Target that doesn't want to use the independent code generator simply does not implement them, and returns either `false` or `nullptr`. 3. Renames `LLVMTargetMachine` to `CodeGenCommonTMImpl`. This renaming aims to make the purpose of `LLVMTargetMachine` clearer. Its interface was moved under the CodeGen library, to further emphasis its usage in Targets that use CodeGen directly. 4. Makes `TargetMachine` the only interface used across LLVM and its projects. With these changes, `CodeGenCommonTMImpl` is simply a set of shared function implementations of `TargetMachine`, and CodeGen users don't need to static cast to `LLVMTargetMachine` every time they need a CodeGen-specific feature of the `TargetMachine`. 5. More importantly, does not change any requirements regarding library linking. cc @arsenm @aeubanks
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/CodeGen/CodeGenTargetMachineImpl.h"
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#include "llvm/IR/DataLayout.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 CodeGenTargetMachineImpl {
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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, CodeGenOptLevel 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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