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//===------ ObjectFileInterface.cpp - MU interface utils for objects ------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/Orc/ObjectFileInterface.h"
#include "llvm/ExecutionEngine/Orc/ELFNixPlatform.h"
#include "llvm/ExecutionEngine/Orc/MachOPlatform.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "orc"
namespace llvm {
namespace orc {
void addInitSymbol(MaterializationUnit::Interface &I, ExecutionSession &ES,
StringRef ObjFileName) {
assert(!I.InitSymbol && "I already has an init symbol");
size_t Counter = 0;
do {
std::string InitSymString;
raw_string_ostream(InitSymString)
<< "$." << ObjFileName << ".__inits." << Counter++;
I.InitSymbol = ES.intern(InitSymString);
} while (I.SymbolFlags.count(I.InitSymbol));
I.SymbolFlags[I.InitSymbol] = JITSymbolFlags::MaterializationSideEffectsOnly;
}
static Expected<MaterializationUnit::Interface>
getMachOObjectFileSymbolInfo(ExecutionSession &ES,
const object::MachOObjectFile &Obj) {
MaterializationUnit::Interface I;
for (auto &Sym : Obj.symbols()) {
Expected<uint32_t> SymFlagsOrErr = Sym.getFlags();
if (!SymFlagsOrErr)
// TODO: Test this error.
return SymFlagsOrErr.takeError();
// Skip symbols not defined in this object file.
if (*SymFlagsOrErr & object::BasicSymbolRef::SF_Undefined)
continue;
// Skip symbols that are not global.
if (!(*SymFlagsOrErr & object::BasicSymbolRef::SF_Global))
continue;
// Skip symbols that have type SF_File.
if (auto SymType = Sym.getType()) {
if (*SymType == object::SymbolRef::ST_File)
continue;
} else
return SymType.takeError();
auto Name = Sym.getName();
if (!Name)
return Name.takeError();
auto InternedName = ES.intern(*Name);
auto SymFlags = JITSymbolFlags::fromObjectSymbol(Sym);
if (!SymFlags)
return SymFlags.takeError();
// Strip the 'exported' flag from MachO linker-private symbols.
if (Name->startswith("l"))
*SymFlags &= ~JITSymbolFlags::Exported;
I.SymbolFlags[InternedName] = std::move(*SymFlags);
}
for (auto &Sec : Obj.sections()) {
auto SecType = Obj.getSectionType(Sec);
if ((SecType & MachO::SECTION_TYPE) == MachO::S_MOD_INIT_FUNC_POINTERS) {
addInitSymbol(I, ES, Obj.getFileName());
break;
}
auto SegName = Obj.getSectionFinalSegmentName(Sec.getRawDataRefImpl());
auto SecName = cantFail(Obj.getSectionName(Sec.getRawDataRefImpl()));
if (MachOPlatform::isInitializerSection(SegName, SecName)) {
addInitSymbol(I, ES, Obj.getFileName());
break;
}
}
return I;
}
static Expected<MaterializationUnit::Interface>
getELFObjectFileSymbolInfo(ExecutionSession &ES,
const object::ELFObjectFileBase &Obj) {
MaterializationUnit::Interface I;
for (auto &Sym : Obj.symbols()) {
Expected<uint32_t> SymFlagsOrErr = Sym.getFlags();
if (!SymFlagsOrErr)
// TODO: Test this error.
return SymFlagsOrErr.takeError();
// Skip symbols not defined in this object file.
if (*SymFlagsOrErr & object::BasicSymbolRef::SF_Undefined)
continue;
// Skip symbols that are not global.
if (!(*SymFlagsOrErr & object::BasicSymbolRef::SF_Global))
continue;
// Skip symbols that have type SF_File.
if (auto SymType = Sym.getType()) {
if (*SymType == object::SymbolRef::ST_File)
continue;
} else
return SymType.takeError();
auto Name = Sym.getName();
if (!Name)
return Name.takeError();
auto InternedName = ES.intern(*Name);
auto SymFlags = JITSymbolFlags::fromObjectSymbol(Sym);
if (!SymFlags)
return SymFlags.takeError();
// ELF STB_GNU_UNIQUE should map to Weak for ORC.
if (Sym.getBinding() == ELF::STB_GNU_UNIQUE)
*SymFlags |= JITSymbolFlags::Weak;
I.SymbolFlags[InternedName] = std::move(*SymFlags);
}
SymbolStringPtr InitSymbol;
for (auto &Sec : Obj.sections()) {
if (auto SecName = Sec.getName()) {
if (ELFNixPlatform::isInitializerSection(*SecName)) {
addInitSymbol(I, ES, Obj.getFileName());
break;
}
}
}
return I;
}
Expected<MaterializationUnit::Interface>
getGenericObjectFileSymbolInfo(ExecutionSession &ES,
const object::ObjectFile &Obj) {
MaterializationUnit::Interface I;
for (auto &Sym : Obj.symbols()) {
Expected<uint32_t> SymFlagsOrErr = Sym.getFlags();
if (!SymFlagsOrErr)
// TODO: Test this error.
return SymFlagsOrErr.takeError();
// Skip symbols not defined in this object file.
if (*SymFlagsOrErr & object::BasicSymbolRef::SF_Undefined)
continue;
// Skip symbols that are not global.
if (!(*SymFlagsOrErr & object::BasicSymbolRef::SF_Global))
continue;
// Skip symbols that have type SF_File.
if (auto SymType = Sym.getType()) {
if (*SymType == object::SymbolRef::ST_File)
continue;
} else
return SymType.takeError();
auto Name = Sym.getName();
if (!Name)
return Name.takeError();
auto InternedName = ES.intern(*Name);
auto SymFlags = JITSymbolFlags::fromObjectSymbol(Sym);
if (!SymFlags)
return SymFlags.takeError();
I.SymbolFlags[InternedName] = std::move(*SymFlags);
}
return I;
}
Expected<MaterializationUnit::Interface>
getObjectFileInterface(ExecutionSession &ES, MemoryBufferRef ObjBuffer) {
auto Obj = object::ObjectFile::createObjectFile(ObjBuffer);
if (!Obj)
return Obj.takeError();
if (auto *MachOObj = dyn_cast<object::MachOObjectFile>(Obj->get()))
return getMachOObjectFileSymbolInfo(ES, *MachOObj);
else if (auto *ELFObj = dyn_cast<object::ELFObjectFileBase>(Obj->get()))
return getELFObjectFileSymbolInfo(ES, *ELFObj);
return getGenericObjectFileSymbolInfo(ES, **Obj);
}
} // End namespace orc.
} // End namespace llvm.
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