forked from OSchip/llvm-project
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
//===- Target.h -------------------------------------------------*- 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 LLD_MACHO_TARGET_H
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#define LLD_MACHO_TARGET_H
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#include "llvm/BinaryFormat/MachO.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <cstddef>
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#include <cstdint>
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namespace lld {
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namespace macho {
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class DylibSymbol;
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class InputSection;
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struct Reloc;
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enum {
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// We are currently only supporting 64-bit targets since macOS and iOS are
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// deprecating 32-bit apps.
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WordSize = 8,
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PageSize = 4096,
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ImageBase = 4096,
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MaxAlignmentPowerOf2 = 32,
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};
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class TargetInfo {
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public:
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virtual ~TargetInfo() = default;
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// Validate the relocation structure and get its addend.
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virtual uint64_t
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getImplicitAddend(llvm::MemoryBufferRef, const llvm::MachO::section_64 &,
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const llvm::MachO::relocation_info &) const = 0;
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virtual void relocateOne(uint8_t *loc, uint8_t type, uint64_t val) const = 0;
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// Write code for lazy binding. See the comments on StubsSection for more
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// details.
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virtual void writeStub(uint8_t *buf, const DylibSymbol &) const = 0;
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virtual void writeStubHelperHeader(uint8_t *buf) const = 0;
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virtual void writeStubHelperEntry(uint8_t *buf, const DylibSymbol &,
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uint64_t entryAddr) const = 0;
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// Dylib symbols are referenced via either the GOT or the stubs section,
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// depending on the relocation type. prepareDylibSymbolRelocation() will set
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// up the GOT/stubs entries, and getDylibSymbolVA() will return the addresses
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// of those entries.
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virtual void prepareDylibSymbolRelocation(DylibSymbol &, uint8_t type) = 0;
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virtual uint64_t getDylibSymbolVA(const DylibSymbol &,
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uint8_t type) const = 0;
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uint32_t cpuType;
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uint32_t cpuSubtype;
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size_t stubSize;
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size_t stubHelperHeaderSize;
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size_t stubHelperEntrySize;
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};
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TargetInfo *createX86_64TargetInfo();
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extern TargetInfo *target;
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} // namespace macho
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} // namespace lld
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#endif
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