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
109 lines
3.6 KiB
C++
109 lines
3.6 KiB
C++
//=- WebAssemblySubtarget.h - Define Subtarget for the 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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/// TargetSubtarget.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYSUBTARGET_H
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#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYSUBTARGET_H
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#include "WebAssemblyFrameLowering.h"
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#include "WebAssemblyISelLowering.h"
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#include "WebAssemblyInstrInfo.h"
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#include "WebAssemblySelectionDAGInfo.h"
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#include "llvm/CodeGen/TargetSubtargetInfo.h"
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#include <string>
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#define GET_SUBTARGETINFO_ENUM
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#define GET_SUBTARGETINFO_HEADER
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#include "WebAssemblyGenSubtargetInfo.inc"
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namespace llvm {
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// Defined in WebAssemblyGenSubtargetInfo.inc.
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extern const SubtargetFeatureKV
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WebAssemblyFeatureKV[WebAssembly::NumSubtargetFeatures];
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class WebAssemblySubtarget final : public WebAssemblyGenSubtargetInfo {
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enum SIMDEnum {
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NoSIMD,
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SIMD128,
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UnimplementedSIMD128,
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} SIMDLevel = NoSIMD;
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bool HasAtomics = false;
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bool HasNontrappingFPToInt = false;
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bool HasSignExt = false;
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bool HasExceptionHandling = false;
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bool HasBulkMemory = false;
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/// String name of used CPU.
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std::string CPUString;
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/// What processor and OS we're targeting.
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Triple TargetTriple;
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WebAssemblyFrameLowering FrameLowering;
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WebAssemblyInstrInfo InstrInfo;
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WebAssemblySelectionDAGInfo TSInfo;
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WebAssemblyTargetLowering TLInfo;
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/// Initializes using CPUString and the passed in feature string so that we
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/// can use initializer lists for subtarget initialization.
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WebAssemblySubtarget &initializeSubtargetDependencies(StringRef FS);
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public:
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/// This constructor initializes the data members to match that
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/// of the specified triple.
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WebAssemblySubtarget(const Triple &TT, const std::string &CPU,
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const std::string &FS, const TargetMachine &TM);
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const WebAssemblySelectionDAGInfo *getSelectionDAGInfo() const override {
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return &TSInfo;
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}
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const WebAssemblyFrameLowering *getFrameLowering() const override {
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return &FrameLowering;
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}
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const WebAssemblyTargetLowering *getTargetLowering() const override {
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return &TLInfo;
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}
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const WebAssemblyInstrInfo *getInstrInfo() const override {
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return &InstrInfo;
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}
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const WebAssemblyRegisterInfo *getRegisterInfo() const override {
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return &getInstrInfo()->getRegisterInfo();
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}
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const Triple &getTargetTriple() const { return TargetTriple; }
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bool enableAtomicExpand() const override;
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bool enableMachineScheduler() const override;
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bool useAA() const override;
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// Predicates used by WebAssemblyInstrInfo.td.
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bool hasAddr64() const { return TargetTriple.isArch64Bit(); }
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bool hasSIMD128() const { return SIMDLevel >= SIMD128; }
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bool hasUnimplementedSIMD128() const {
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return SIMDLevel >= UnimplementedSIMD128;
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}
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bool hasAtomics() const { return HasAtomics; }
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bool hasNontrappingFPToInt() const { return HasNontrappingFPToInt; }
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bool hasSignExt() const { return HasSignExt; }
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bool hasExceptionHandling() const { return HasExceptionHandling; }
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bool hasBulkMemory() const { return HasBulkMemory; }
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/// Parses features string setting specified subtarget options. Definition of
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/// function is auto generated by tblgen.
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void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
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};
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} // end namespace llvm
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#endif
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