forked from OSchip/llvm-project
87 lines
2.6 KiB
C++
87 lines
2.6 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 "Writer.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::getFileSize() const {
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return isZeroFill(flags) ? 0 : getSize();
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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 referentVA = 0;
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if (auto *referentSym = r.referent.dyn_cast<Symbol *>()) {
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referentVA =
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target->resolveSymbolVA(buf + r.offset, *referentSym, r.type);
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if (isThreadLocalVariables(flags)) {
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// References from thread-local variable sections are treated as offsets
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// relative to the start of the thread-local data memory area, which
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// is initialized via copying all the TLV data sections (which are all
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// contiguous).
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if (isa<Defined>(referentSym))
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referentVA -= firstTLVDataSection->addr;
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}
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} else if (auto *referentIsec = r.referent.dyn_cast<InputSection *>()) {
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referentVA = referentIsec->getVA();
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}
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uint64_t referentVal = referentVA + r.addend;
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if (r.pcrel)
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referentVal -= getVA() + r.offset;
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target->relocateOne(buf + r.offset, r, referentVal);
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}
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}
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bool macho::isCodeSection(InputSection *isec) {
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uint32_t type = isec->flags & MachO::SECTION_TYPE;
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if (type != S_REGULAR && type != S_COALESCED)
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return false;
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uint32_t attr = isec->flags & MachO::SECTION_ATTRIBUTES_USR;
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if (attr == S_ATTR_PURE_INSTRUCTIONS)
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return true;
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if (isec->segname == segment_names::text)
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return StringSwitch<bool>(isec->name)
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.Cases("__textcoal_nt", "__StaticInit", true)
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.Default(false);
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return false;
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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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