forked from OSchip/llvm-project
58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
//===- InputSection.cpp ---------------------------------------------------===//
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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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#include "InputSection.h"
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#include "OutputSegment.h"
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#include "Symbols.h"
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#include "Target.h"
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#include "lld/Common/Memory.h"
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#include "llvm/Support/Endian.h"
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using namespace llvm::MachO;
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using namespace llvm::support;
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using namespace lld;
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using namespace lld::macho;
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std::vector<InputSection *> macho::inputSections;
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uint64_t InputSection::getFileOffset() const {
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return parent->fileOff + outSecFileOff;
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}
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uint64_t InputSection::getVA() const { return parent->addr + outSecOff; }
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void InputSection::writeTo(uint8_t *buf) {
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if (!data.empty())
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memcpy(buf, data.data(), data.size());
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for (Reloc &r : relocs) {
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uint64_t va = 0;
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uint64_t addend = r.addend;
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if (auto *s = r.target.dyn_cast<Symbol *>()) {
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if (auto *dylibSymbol = dyn_cast<DylibSymbol>(s)) {
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va = target->getDylibSymbolVA(*dylibSymbol, r.type);
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} else {
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va = s->getVA();
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}
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} else if (auto *isec = r.target.dyn_cast<InputSection *>()) {
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va = isec->getVA();
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// The implicit addend for pcrel section relocations is the pcrel offset
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// in terms of the addresses in the input file. Here we adjust it so that
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// it describes the offset from the start of the target section.
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// TODO: Figure out what to do for non-pcrel section relocations.
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// TODO: The offset of 4 is probably not right for ARM64.
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addend -= isec->header->addr - (header->addr + r.offset + 4);
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}
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uint64_t val = va + addend;
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if (1) // TODO: handle non-pcrel relocations
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val -= getVA() + r.offset;
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target->relocateOne(buf + r.offset, r.type, val);
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}
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}
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