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06c1a3680b
1c5a3c4d3823 updated the variables inserted by Emscripten SjLj lowering to be thread-local, depending on the CoalesceFeaturesAndStripAtomics pass to downgrade them to normal globals if the target features did not support TLS. However, this had the unintended side effect of preventing all non-TLS-supporting objects from being linked into modules with shared memory, because stripping TLS marks an object as thread-unsafe. This patch fixes the problem by only making the SjLj lowering variables thread-local if the target machine supports TLS so that it never introduces new usage of TLS that will be stripped. Since SjLj lowering works on Modules instead of Functions, this required that the WebAssemblyTargetMachine have its feature string updated to reflect the coalesced features collected from all the functions so that a WebAssemblySubtarget can be created without using any particular function. Differential Revision: https://reviews.llvm.org/D88323
65 lines
2.3 KiB
C++
65 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() const;
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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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