3f34e1b883
Summary: It does not currently make sense to use WebAssembly features in some functions but not others, so this CL adds an IR pass that takes the union of all used feature sets and applies it to each function in the module. This allows us to prevent atomics from being lowered away if some function has opted in to using them. When atomics is not enabled anywhere, we detect whether there exists any atomic operations or thread local storage that would be stripped and disallow linking with objects that contain atomics if and only if atomics or tls are stripped. When atomics is enabled, mark it as used but do not require it of other objects in the link. These changes allow libraries that do not use atomics to be built once and linked into both single-threaded and multithreaded binaries. Reviewers: aheejin, sbc100, dschuff Subscribers: jgravelle-google, hiraditya, sunfish, jfb, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D59625 llvm-svn: 357226
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 usesPhysRegsForPEI() 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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