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23fe8db89f
This change implements lowering of references global symbols in PIC mode. This change implements lowering of global references in PIC mode using a new @GOT reference type. @GOT references can be used with function or data symbol names combined with the get_global instruction. In this case the linker will insert the wasm global that stores the address of the symbol (either in memory for data symbols or in the wasm table for function symbols). For now I'm continuing to use the R_WASM_GLOBAL_INDEX_LEB relocation type for this type of reference which means that this relocation type can refer to either a global or a function or data symbol. We could choose to introduce specific relocation types for GOT entries in the future. See the current dynamic linking proposal: https://github.com/WebAssembly/tool-conventions/blob/master/DynamicLinking.md Differential Revision: https://reviews.llvm.org/D54647 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357022 91177308-0d34-0410-b5e6-96231b3b80d8
46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
//===-- WebAssemblyMCInstLower.h - Lower MachineInstr to MCInst -*- 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 class to lower WebAssembly MachineInstrs to
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/// their corresponding MCInst records.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMCINSTLOWER_H
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#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMCINSTLOWER_H
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#include "llvm/MC/MCInst.h"
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#include "llvm/Support/Compiler.h"
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namespace llvm {
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class WebAssemblyAsmPrinter;
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class MCContext;
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class MCSymbol;
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class MachineInstr;
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class MachineOperand;
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/// This class is used to lower an MachineInstr into an MCInst.
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class LLVM_LIBRARY_VISIBILITY WebAssemblyMCInstLower {
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MCContext &Ctx;
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WebAssemblyAsmPrinter &Printer;
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MCSymbol *GetGlobalAddressSymbol(const MachineOperand &MO) const;
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MCSymbol *GetExternalSymbolSymbol(const MachineOperand &MO) const;
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MCOperand lowerSymbolOperand(MCSymbol *Sym, int64_t Offset, bool IsFunc,
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unsigned flags) const;
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public:
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WebAssemblyMCInstLower(MCContext &ctx, WebAssemblyAsmPrinter &printer)
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: Ctx(ctx), Printer(printer) {}
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void lower(const MachineInstr *MI, MCInst &OutMI) const;
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};
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} // end namespace llvm
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#endif
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