2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
155 lines
4.7 KiB
C++
155 lines
4.7 KiB
C++
//===- lib/ReaderWriter/MachO/ExecutableAtoms.h ---------------------------===//
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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_READER_WRITER_MACHO_EXECUTABLE_ATOMS_H
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#define LLD_READER_WRITER_MACHO_EXECUTABLE_ATOMS_H
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#include "Atoms.h"
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#include "File.h"
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#include "llvm/BinaryFormat/MachO.h"
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#include "lld/Core/DefinedAtom.h"
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#include "lld/Core/File.h"
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#include "lld/Core/LinkingContext.h"
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#include "lld/Core/Reference.h"
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#include "lld/Core/Simple.h"
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#include "lld/Core/UndefinedAtom.h"
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#include "lld/ReaderWriter/MachOLinkingContext.h"
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namespace lld {
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namespace mach_o {
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//
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// CEntryFile adds an UndefinedAtom for "_main" so that the Resolving
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// phase will fail if "_main" is undefined.
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//
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class CEntryFile : public SimpleFile {
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public:
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CEntryFile(const MachOLinkingContext &context)
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: SimpleFile("C entry", kindCEntryObject),
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_undefMain(*this, context.entrySymbolName()) {
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this->addAtom(_undefMain);
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}
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private:
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SimpleUndefinedAtom _undefMain;
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};
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//
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// StubHelperFile adds an UndefinedAtom for "dyld_stub_binder" so that
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// the Resolveing phase will fail if "dyld_stub_binder" is undefined.
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//
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class StubHelperFile : public SimpleFile {
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public:
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StubHelperFile(const MachOLinkingContext &context)
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: SimpleFile("stub runtime", kindStubHelperObject),
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_undefBinder(*this, context.binderSymbolName()) {
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this->addAtom(_undefBinder);
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}
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private:
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SimpleUndefinedAtom _undefBinder;
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};
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//
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// MachHeaderAliasFile lazily instantiates the magic symbols that mark the start
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// of the mach_header for final linked images.
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//
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class MachHeaderAliasFile : public SimpleFile {
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public:
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MachHeaderAliasFile(const MachOLinkingContext &context)
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: SimpleFile("mach_header symbols", kindHeaderObject) {
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StringRef machHeaderSymbolName;
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DefinedAtom::Scope symbolScope = DefinedAtom::scopeLinkageUnit;
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StringRef dsoHandleName;
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switch (context.outputMachOType()) {
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case llvm::MachO::MH_OBJECT:
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machHeaderSymbolName = "__mh_object_header";
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break;
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case llvm::MachO::MH_EXECUTE:
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machHeaderSymbolName = "__mh_execute_header";
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symbolScope = DefinedAtom::scopeGlobal;
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dsoHandleName = "___dso_handle";
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break;
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case llvm::MachO::MH_FVMLIB:
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llvm_unreachable("no mach_header symbol for file type");
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case llvm::MachO::MH_CORE:
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llvm_unreachable("no mach_header symbol for file type");
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case llvm::MachO::MH_PRELOAD:
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llvm_unreachable("no mach_header symbol for file type");
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case llvm::MachO::MH_DYLIB:
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machHeaderSymbolName = "__mh_dylib_header";
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dsoHandleName = "___dso_handle";
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break;
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case llvm::MachO::MH_DYLINKER:
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machHeaderSymbolName = "__mh_dylinker_header";
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dsoHandleName = "___dso_handle";
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break;
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case llvm::MachO::MH_BUNDLE:
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machHeaderSymbolName = "__mh_bundle_header";
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dsoHandleName = "___dso_handle";
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break;
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case llvm::MachO::MH_DYLIB_STUB:
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llvm_unreachable("no mach_header symbol for file type");
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case llvm::MachO::MH_DSYM:
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llvm_unreachable("no mach_header symbol for file type");
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case llvm::MachO::MH_KEXT_BUNDLE:
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dsoHandleName = "___dso_handle";
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break;
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}
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if (!machHeaderSymbolName.empty())
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_definedAtoms.push_back(new (allocator()) MachODefinedAtom(
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*this, machHeaderSymbolName, symbolScope,
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DefinedAtom::typeMachHeader, DefinedAtom::mergeNo, false,
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true /* noDeadStrip */,
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ArrayRef<uint8_t>(), DefinedAtom::Alignment(4096)));
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if (!dsoHandleName.empty())
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_definedAtoms.push_back(new (allocator()) MachODefinedAtom(
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*this, dsoHandleName, DefinedAtom::scopeLinkageUnit,
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DefinedAtom::typeDSOHandle, DefinedAtom::mergeNo, false,
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true /* noDeadStrip */,
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ArrayRef<uint8_t>(), DefinedAtom::Alignment(1)));
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}
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const AtomRange<DefinedAtom> defined() const override {
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return _definedAtoms;
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}
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const AtomRange<UndefinedAtom> undefined() const override {
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return _noUndefinedAtoms;
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}
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const AtomRange<SharedLibraryAtom> sharedLibrary() const override {
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return _noSharedLibraryAtoms;
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}
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const AtomRange<AbsoluteAtom> absolute() const override {
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return _noAbsoluteAtoms;
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}
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void clearAtoms() override {
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_definedAtoms.clear();
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_noUndefinedAtoms.clear();
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_noSharedLibraryAtoms.clear();
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_noAbsoluteAtoms.clear();
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}
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private:
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mutable AtomVector<DefinedAtom> _definedAtoms;
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};
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} // namespace mach_o
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} // namespace lld
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#endif // LLD_READER_WRITER_MACHO_EXECUTABLE_ATOMS_H
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