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3ef169e586
Summary: WebAssembly is unique among upstream targets in that it does not at any point use physical registers to store values. Instead, it uses virtual registers to model positions in its value stack. This means that some target-independent lowering activities that would use physical registers need to use virtual registers instead for WebAssembly and similar downstream targets. This CL generalizes the existing `usesPhysRegsForPEI` lowering hook to `usesPhysRegsForValues` in preparation for using it in more places. One such place is in InstrEmitter for instructions that have variadic defs. On register machines, it only makes sense for these defs to be physical registers, but for WebAssembly they must be virtual registers like any other values. This CL changes InstrEmitter to check the new target lowering hook to determine whether variadic defs should be physical or virtual registers. These changes are necessary to support a generalized CALL instruction for WebAssembly that is capable of returning an arbitrary number of arguments. Fully implementing that instruction will require additional changes that are described in comments here but left for a follow up commit. Reviewers: aheejin, dschuff, qcolombet Subscribers: sbc100, jgravelle-google, hiraditya, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D71484
64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
// WebAssemblyTargetMachine.h - Define TargetMachine for WebAssembly -*- 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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/// This file declares the WebAssembly-specific subclass of
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/// TargetMachine.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYTARGETMACHINE_H
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#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYTARGETMACHINE_H
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#include "WebAssemblySubtarget.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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class WebAssemblyTargetMachine final : public LLVMTargetMachine {
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std::unique_ptr<TargetLoweringObjectFile> TLOF;
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mutable StringMap<std::unique_ptr<WebAssemblySubtarget>> SubtargetMap;
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public:
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WebAssemblyTargetMachine(const Target &T, const Triple &TT, StringRef CPU,
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StringRef FS, const TargetOptions &Options,
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Optional<Reloc::Model> RM,
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Optional<CodeModel::Model> CM, CodeGenOpt::Level OL,
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bool JIT);
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~WebAssemblyTargetMachine() override;
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const WebAssemblySubtarget *getSubtargetImpl(std::string CPU,
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std::string FS) const;
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const WebAssemblySubtarget *
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getSubtargetImpl(const Function &F) const override;
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// Pass Pipeline Configuration
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TargetPassConfig *createPassConfig(PassManagerBase &PM) override;
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TargetLoweringObjectFile *getObjFileLowering() const override {
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return TLOF.get();
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}
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TargetTransformInfo getTargetTransformInfo(const Function &F) override;
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bool usesPhysRegsForValues() const override { return false; }
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yaml::MachineFunctionInfo *createDefaultFuncInfoYAML() const override;
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yaml::MachineFunctionInfo *
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convertFuncInfoToYAML(const MachineFunction &MF) const override;
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bool parseMachineFunctionInfo(const yaml::MachineFunctionInfo &,
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PerFunctionMIParsingState &PFS,
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SMDiagnostic &Error,
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SMRange &SourceRange) const override;
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};
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} // end namespace llvm
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#endif
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