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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
106 lines
3.5 KiB
C++
106 lines
3.5 KiB
C++
//===-- LlvmState.h ---------------------------------------------*- 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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/// \file
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/// A class to set up and access common LLVM objects.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_EXEGESIS_LLVMSTATE_H
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#define LLVM_TOOLS_LLVM_EXEGESIS_LLVMSTATE_H
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#include "MCInstrDescView.h"
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#include "RegisterAliasing.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCRegister.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include <memory>
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#include <string>
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static constexpr llvm::StringLiteral kNoRegister("%noreg");
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namespace llvm {
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namespace exegesis {
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class ExegesisTarget;
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struct PfmCountersInfo;
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// An object to initialize LLVM and prepare objects needed to run the
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// measurements.
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class LLVMState {
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public:
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// Factory function.
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// If `Triple` is empty, uses the host triple.
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// If `CpuName` is empty, uses the host CPU.
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// If `UseDummyPerfCounters` is set, does not query the kernel
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// for event counts.
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// `UseDummyPerfCounters` and `Features` are intended for tests.
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static Expected<LLVMState> Create(std::string TripleName, std::string CpuName,
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StringRef Features = "",
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bool UseDummyPerfCounters = false);
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const TargetMachine &getTargetMachine() const { return *TheTargetMachine; }
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std::unique_ptr<TargetMachine> createTargetMachine() const;
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const ExegesisTarget &getExegesisTarget() const { return *TheExegesisTarget; }
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bool canAssemble(const MCInst &mc_inst) const;
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// For convenience:
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const MCInstrInfo &getInstrInfo() const {
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return *TheTargetMachine->getMCInstrInfo();
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}
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const MCRegisterInfo &getRegInfo() const {
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return *TheTargetMachine->getMCRegisterInfo();
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}
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const MCSubtargetInfo &getSubtargetInfo() const {
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return *TheTargetMachine->getMCSubtargetInfo();
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}
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const RegisterAliasingTrackerCache &getRATC() const { return *RATC; }
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const InstructionsCache &getIC() const { return *IC; }
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const PfmCountersInfo &getPfmCounters() const { return *PfmCounters; }
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const DenseMap<StringRef, unsigned> &getOpcodeNameToOpcodeIdxMapping() const {
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assert(OpcodeNameToOpcodeIdxMapping);
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return *OpcodeNameToOpcodeIdxMapping;
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};
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std::optional<MCRegister>
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getRegisterNumberFromName(StringRef RegisterName) const;
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private:
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std::unique_ptr<const DenseMap<StringRef, unsigned>>
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createOpcodeNameToOpcodeIdxMapping() const;
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std::unique_ptr<const DenseMap<StringRef, MCRegister>>
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createRegNameToRegNoMapping() const;
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LLVMState(std::unique_ptr<const TargetMachine> TM, const ExegesisTarget *ET,
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const PfmCountersInfo *PCI);
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const ExegesisTarget *TheExegesisTarget;
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std::unique_ptr<const TargetMachine> TheTargetMachine;
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std::unique_ptr<const RegisterAliasingTrackerCache> RATC;
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std::unique_ptr<const InstructionsCache> IC;
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const PfmCountersInfo *PfmCounters;
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std::unique_ptr<const DenseMap<StringRef, unsigned>>
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OpcodeNameToOpcodeIdxMapping;
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std::unique_ptr<const DenseMap<StringRef, MCRegister>> RegNameToRegNoMapping;
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};
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} // namespace exegesis
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} // namespace llvm
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#endif // LLVM_TOOLS_LLVM_EXEGESIS_LLVMSTATE_H
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