f3b4f99007
Summary: In the clang UI, replaces -mthread-model posix with -matomics as the source of truth on threading. In the backend, replaces -thread-model=posix with the atomics target feature, which is now collected on the WebAssemblyTargetMachine along with all other used features. These collected features will also be used to emit the target features section in the future. The default configuration for the backend is thread-model=posix and no atomics, which was previously an invalid configuration. This change makes the default valid because the thread model is ignored. A side effect of this change is that objects are never emitted with passive segments. It will instead be up to the linker to decide whether sections should be active or passive based on whether atomics are used in the final link. Reviewers: aheejin, sbc100, dschuff Subscribers: mehdi_amini, jgravelle-google, hiraditya, sunfish, steven_wu, dexonsmith, rupprecht, jfb, jdoerfert, cfe-commits, llvm-commits Tags: #clang, #llvm Differential Revision: https://reviews.llvm.org/D58742 llvm-svn: 355112
59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
// WebAssemblyTargetMachine.h - Define TargetMachine for WebAssembly -*- C++ -*-
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// \file
|
|
/// This file declares the WebAssembly-specific subclass of
|
|
/// TargetMachine.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYTARGETMACHINE_H
|
|
#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYTARGETMACHINE_H
|
|
|
|
#include "WebAssemblySubtarget.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
|
|
namespace llvm {
|
|
|
|
class WebAssemblyTargetMachine final : public LLVMTargetMachine {
|
|
std::unique_ptr<TargetLoweringObjectFile> TLOF;
|
|
mutable StringMap<std::unique_ptr<WebAssemblySubtarget>> SubtargetMap;
|
|
mutable FeatureBitset UsedFeatures;
|
|
|
|
public:
|
|
WebAssemblyTargetMachine(const Target &T, const Triple &TT, StringRef CPU,
|
|
StringRef FS, const TargetOptions &Options,
|
|
Optional<Reloc::Model> RM,
|
|
Optional<CodeModel::Model> CM, CodeGenOpt::Level OL,
|
|
bool JIT);
|
|
|
|
~WebAssemblyTargetMachine() override;
|
|
|
|
const WebAssemblySubtarget *getSubtargetImpl(std::string CPU,
|
|
std::string FS) const;
|
|
const WebAssemblySubtarget *
|
|
getSubtargetImpl(const Function &F) const override;
|
|
|
|
// Pass Pipeline Configuration
|
|
TargetPassConfig *createPassConfig(PassManagerBase &PM) override;
|
|
|
|
TargetLoweringObjectFile *getObjFileLowering() const override {
|
|
return TLOF.get();
|
|
}
|
|
|
|
FeatureBitset getUsedFeatures() const { return UsedFeatures; }
|
|
|
|
TargetTransformInfo getTargetTransformInfo(const Function &F) override;
|
|
|
|
bool usesPhysRegsForPEI() const override { return false; }
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|