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39812314f7
Summary: Implements a new target features section in assembly and object files that records what features are used, required, and disallowed in WebAssembly objects. The linker uses this information to ensure that all objects participating in a link are feature-compatible and records the set of used features in the output binary for use by optimizers and other tools later in the toolchain. The "atomics" feature is always required or disallowed to prevent linking code with stripped atomics into multithreaded binaries. Other features are marked used if they are enabled globally or on any function in a module. Future CLs will add linker flags for ignoring feature compatibility checks and for specifying the set of allowed features, implement using the presence of the "atomics" feature to control the type of memory and segments in the linked binary, and add front-end flags for relaxing the linkage policy for atomics. Reviewers: aheejin, sbc100, dschuff Subscribers: jgravelle-google, hiraditya, sunfish, mgrang, jfb, jdoerfert, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D59173 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356610 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
3.0 KiB
C++
82 lines
3.0 KiB
C++
// WebAssemblyAsmPrinter.h - WebAssembly implementation of AsmPrinter-*- 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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#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYASMPRINTER_H
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#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYASMPRINTER_H
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#include "WebAssemblyMachineFunctionInfo.h"
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#include "WebAssemblySubtarget.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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class MCSymbol;
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class WebAssemblyTargetStreamer;
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class WebAssemblyMCInstLower;
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class LLVM_LIBRARY_VISIBILITY WebAssemblyAsmPrinter final : public AsmPrinter {
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const WebAssemblySubtarget *Subtarget;
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const MachineRegisterInfo *MRI;
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WebAssemblyFunctionInfo *MFI;
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// TODO: Do the uniquing of Signatures here instead of ObjectFileWriter?
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std::vector<std::unique_ptr<wasm::WasmSignature>> Signatures;
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public:
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explicit WebAssemblyAsmPrinter(TargetMachine &TM,
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std::unique_ptr<MCStreamer> Streamer)
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: AsmPrinter(TM, std::move(Streamer)), Subtarget(nullptr), MRI(nullptr),
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MFI(nullptr) {}
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StringRef getPassName() const override {
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return "WebAssembly Assembly Printer";
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}
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const WebAssemblySubtarget &getSubtarget() const { return *Subtarget; }
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void addSignature(std::unique_ptr<wasm::WasmSignature> &&Sig) {
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Signatures.push_back(std::move(Sig));
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}
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//===------------------------------------------------------------------===//
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// MachineFunctionPass Implementation.
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//===------------------------------------------------------------------===//
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bool runOnMachineFunction(MachineFunction &MF) override {
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Subtarget = &MF.getSubtarget<WebAssemblySubtarget>();
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MRI = &MF.getRegInfo();
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MFI = MF.getInfo<WebAssemblyFunctionInfo>();
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return AsmPrinter::runOnMachineFunction(MF);
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}
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//===------------------------------------------------------------------===//
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// AsmPrinter Implementation.
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//===------------------------------------------------------------------===//
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void EmitEndOfAsmFile(Module &M) override;
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void EmitProducerInfo(Module &M);
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void EmitTargetFeatures();
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void EmitJumpTableInfo() override;
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void EmitConstantPool() override;
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void EmitFunctionBodyStart() override;
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void EmitInstruction(const MachineInstr *MI) override;
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &OS) override;
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bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &OS) override;
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MVT getRegType(unsigned RegNo) const;
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std::string regToString(const MachineOperand &MO);
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WebAssemblyTargetStreamer *getTargetStreamer();
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};
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} // end namespace llvm
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#endif
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