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130 lines
4.0 KiB
C++
130 lines
4.0 KiB
C++
//===- JITTargetMachineBuilder.h - Build TargetMachines for JIT -*- 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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// A utitily for building TargetMachines for JITs.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_EXECUTIONENGINE_ORC_JITTARGETMACHINEBUILDER_H
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#define LLVM_EXECUTIONENGINE_ORC_JITTARGETMACHINEBUILDER_H
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/Support/CodeGen.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include <memory>
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#include <string>
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#include <vector>
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namespace llvm {
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namespace orc {
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/// A utility class for building TargetMachines for JITs.
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class JITTargetMachineBuilder {
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public:
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/// Create a JITTargetMachineBuilder based on the given triple.
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///
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/// Note: TargetOptions is default-constructed, then EmulatedTLS and
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/// ExplicitEmulatedTLS are set to true. If EmulatedTLS is not
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/// required, these values should be reset before calling
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/// createTargetMachine.
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JITTargetMachineBuilder(Triple TT);
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/// Create a JITTargetMachineBuilder for the host system.
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///
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/// Note: TargetOptions is default-constructed, then EmulatedTLS and
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/// ExplicitEmulatedTLS are set to true. If EmulatedTLS is not
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/// required, these values should be reset before calling
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/// createTargetMachine.
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static Expected<JITTargetMachineBuilder> detectHost();
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/// Create a TargetMachine.
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///
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/// This operation will fail if the requested target is not registered,
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/// in which case see llvm/Support/TargetSelect.h. To JIT IR the Target and
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/// the target's AsmPrinter must both be registered. To JIT assembly
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/// (including inline and module level assembly) the target's AsmParser must
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/// also be registered.
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Expected<std::unique_ptr<TargetMachine>> createTargetMachine();
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/// Get the default DataLayout for the target.
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///
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/// Note: This is reasonably expensive, as it creates a temporary
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/// TargetMachine instance under the hood. It is only suitable for use during
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/// JIT setup.
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Expected<DataLayout> getDefaultDataLayoutForTarget() {
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auto TM = createTargetMachine();
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if (!TM)
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return TM.takeError();
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return (*TM)->createDataLayout();
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}
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/// Set the CPU string.
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JITTargetMachineBuilder &setCPU(std::string CPU) {
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this->CPU = std::move(CPU);
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return *this;
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}
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/// Set the relocation model.
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JITTargetMachineBuilder &setRelocationModel(Optional<Reloc::Model> RM) {
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this->RM = std::move(RM);
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return *this;
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}
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/// Set the code model.
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JITTargetMachineBuilder &setCodeModel(Optional<CodeModel::Model> CM) {
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this->CM = std::move(CM);
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return *this;
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}
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/// Set the LLVM CodeGen optimization level.
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JITTargetMachineBuilder &setCodeGenOptLevel(CodeGenOpt::Level OptLevel) {
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this->OptLevel = OptLevel;
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return *this;
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}
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/// Add subtarget features.
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JITTargetMachineBuilder &
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addFeatures(const std::vector<std::string> &FeatureVec);
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/// Access subtarget features.
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SubtargetFeatures &getFeatures() { return Features; }
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/// Access subtarget features.
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const SubtargetFeatures &getFeatures() const { return Features; }
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/// Access TargetOptions.
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TargetOptions &getOptions() { return Options; }
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/// Access TargetOptions.
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const TargetOptions &getOptions() const { return Options; }
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/// Access Triple.
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Triple &getTargetTriple() { return TT; }
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/// Access Triple.
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const Triple &getTargetTriple() const { return TT; }
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private:
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Triple TT;
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std::string CPU;
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SubtargetFeatures Features;
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TargetOptions Options;
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Optional<Reloc::Model> RM;
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Optional<CodeModel::Model> CM;
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CodeGenOpt::Level OptLevel = CodeGenOpt::None;
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};
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} // end namespace orc
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} // end namespace llvm
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#endif // LLVM_EXECUTIONENGINE_ORC_JITTARGETMACHINEBUILDER_H
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