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//===- lib/ReaderWriter/MachO/ExecutableAtoms.hpp -------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLD_READER_WRITER_MACHO_EXECUTABLE_ATOMS_H
#define LLD_READER_WRITER_MACHO_EXECUTABLE_ATOMS_H
#include "Atoms.h"
#include "llvm/Support/MachO.h"
#include "lld/Core/ArchiveLibraryFile.h"
#include "lld/Core/DefinedAtom.h"
#include "lld/Core/File.h"
#include "lld/Core/LinkingContext.h"
#include "lld/Core/Reference.h"
#include "lld/Core/Simple.h"
#include "lld/Core/UndefinedAtom.h"
#include "lld/ReaderWriter/MachOLinkingContext.h"
namespace lld {
namespace mach_o {
//
// CEntryFile adds an UndefinedAtom for "_main" so that the Resolving
// phase will fail if "_main" is undefined.
//
class CEntryFile : public SimpleFile {
public:
CEntryFile(const MachOLinkingContext &context)
: SimpleFile("C entry"),
_undefMain(*this, context.entrySymbolName()) {
this->addAtom(_undefMain);
}
private:
SimpleUndefinedAtom _undefMain;
};
//
// StubHelperFile adds an UndefinedAtom for "dyld_stub_binder" so that
// the Resolveing phase will fail if "dyld_stub_binder" is undefined.
//
class StubHelperFile : public SimpleFile {
public:
StubHelperFile(const MachOLinkingContext &context)
: SimpleFile("stub runtime"),
_undefBinder(*this, context.binderSymbolName()) {
this->addAtom(_undefBinder);
}
private:
SimpleUndefinedAtom _undefBinder;
};
//
// MachHeaderAliasFile lazily instantiates the magic symbols that mark the start
// of the mach_header for final linked images.
//
class MachHeaderAliasFile : public ArchiveLibraryFile {
public:
MachHeaderAliasFile(const MachOLinkingContext &context)
: ArchiveLibraryFile("mach_header symbols") {
switch (context.outputMachOType()) {
case llvm::MachO::MH_EXECUTE:
_machHeaderSymbolName = "__mh_execute_header";
break;
case llvm::MachO::MH_DYLIB:
_machHeaderSymbolName = "__mh_dylib_header";
break;
case llvm::MachO::MH_BUNDLE:
_machHeaderSymbolName = "__mh_bundle_header";
break;
case llvm::MachO::MH_DYLINKER:
_machHeaderSymbolName = "__mh_dylinker_header";
break;
case llvm::MachO::MH_PRELOAD:
_machHeaderSymbolName = "__mh_preload_header";
break;
default:
llvm_unreachable("no mach_header symbol for file type");
}
}
std::error_code
parseAllMembers(std::vector<std::unique_ptr<File>> &result) override {
return std::error_code();
}
File *find(StringRef sym, bool dataSymbolOnly) override {
if (sym.equals("___dso_handle") || sym.equals(_machHeaderSymbolName)) {
_definedAtoms._atoms.push_back(new (allocator()) MachODefinedAtom(
*this, sym, DefinedAtom::scopeLinkageUnit,
DefinedAtom::typeMachHeader, DefinedAtom::mergeNo, false, false,
ArrayRef<uint8_t>(), DefinedAtom::Alignment(12,0)));
return this;
}
return nullptr;
}
const atom_collection<DefinedAtom> &defined() const override {
return _definedAtoms;
}
const atom_collection<UndefinedAtom> &undefined() const override {
return _undefinedAtoms;
}
const atom_collection<SharedLibraryAtom> &sharedLibrary() const override {
return _sharedLibraryAtoms;
}
const atom_collection<AbsoluteAtom> &absolute() const override {
return _absoluteAtoms;
}
private:
mutable atom_collection_vector<DefinedAtom> _definedAtoms;
atom_collection_vector<UndefinedAtom> _undefinedAtoms;
atom_collection_vector<SharedLibraryAtom> _sharedLibraryAtoms;
atom_collection_vector<AbsoluteAtom> _absoluteAtoms;
StringRef _machHeaderSymbolName;
};
} // namespace mach_o
} // namespace lld
#endif // LLD_READER_WRITER_MACHO_EXECUTABLE_ATOMS_H
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