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3c9100fb78
References to symbols in dylibs work very similarly regardless of whether the symbol is a TLV. The main difference is that we have a separate `__thread_ptrs` section that acts as the GOT for these thread-locals. We can identify thread-locals in dylibs by a flag in their export trie entries, and we cross-check it with the relocations that refer to them to ensure that we are not using a GOT relocation to reference a thread-local (or vice versa). Reviewed By: #lld-macho, smeenai Differential Revision: https://reviews.llvm.org/D85081
63 lines
1.8 KiB
C++
63 lines
1.8 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 "InputFiles.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;
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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 (getFileSize() == 0)
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return;
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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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if (auto *s = r.target.dyn_cast<Symbol *>()) {
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va = target->resolveSymbolVA(buf + r.offset, *s, r.type);
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if (isThreadLocalVariables(flags)) {
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// References from thread-local variable sections are treated as
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// offsets relative to the start of the target section, instead of as
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// absolute addresses.
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if (auto *defined = dyn_cast<Defined>(s))
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va -= defined->isec->parent->addr;
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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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}
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uint64_t val = va + r.addend;
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if (r.pcrel)
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val -= getVA() + r.offset;
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target->relocateOne(buf + r.offset, r, val);
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}
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}
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std::string lld::toString(const InputSection *isec) {
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return (toString(isec->file) + ":(" + isec->name + ")").str();
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}
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