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//===-------------- COFF.cpp - JIT linker function for COFF -------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// COFF jit-link function.
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/JITLink/COFF.h"
#include "llvm/BinaryFormat/COFF.h"
#include "llvm/ExecutionEngine/JITLink/COFF_x86_64.h"
#include "llvm/Object/COFF.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MemoryBuffer.h"
#include <cstring>
using namespace llvm;
#define DEBUG_TYPE "jitlink"
namespace llvm {
namespace jitlink {
static StringRef getMachineName(uint16_t Machine) {
switch (Machine) {
case COFF::IMAGE_FILE_MACHINE_I386:
return "i386";
case COFF::IMAGE_FILE_MACHINE_AMD64:
return "x86_64";
case COFF::IMAGE_FILE_MACHINE_ARMNT:
return "ARM";
case COFF::IMAGE_FILE_MACHINE_ARM64:
return "ARM64";
default:
return "unknown";
}
}
Expected<std::unique_ptr<LinkGraph>>
createLinkGraphFromCOFFObject(MemoryBufferRef ObjectBuffer) {
StringRef Data = ObjectBuffer.getBuffer();
// Check magic
auto Magic = identify_magic(ObjectBuffer.getBuffer());
if (Magic != file_magic::coff_object)
return make_error<JITLinkError>("Invalid COFF buffer");
if (Data.size() < sizeof(object::coff_file_header))
return make_error<JITLinkError>("Truncated COFF buffer");
uint64_t CurPtr = 0;
bool IsPE = false;
// Check if this is a PE/COFF file.
if (Data.size() >= sizeof(object::dos_header) + sizeof(COFF::PEMagic)) {
const auto *DH =
reinterpret_cast<const object::dos_header *>(Data.data() + CurPtr);
if (DH->Magic[0] == 'M' && DH->Magic[1] == 'Z') {
// Check the PE magic bytes. ("PE\0\0")
CurPtr = DH->AddressOfNewExeHeader;
if (memcmp(Data.data() + CurPtr, COFF::PEMagic, sizeof(COFF::PEMagic)) !=
0) {
return make_error<JITLinkError>("Incorrect PE magic");
}
CurPtr += sizeof(COFF::PEMagic);
IsPE = true;
}
}
if (Data.size() < CurPtr + sizeof(object::coff_file_header))
return make_error<JITLinkError>("Truncated COFF buffer");
const object::coff_file_header *COFFHeader =
reinterpret_cast<const object::coff_file_header *>(Data.data() + CurPtr);
const object::coff_bigobj_file_header *COFFBigObjHeader = nullptr;
// Deal with bigobj file
if (!IsPE && COFFHeader->Machine == COFF::IMAGE_FILE_MACHINE_UNKNOWN &&
COFFHeader->NumberOfSections == uint16_t(0xffff) &&
Data.size() >= sizeof(object::coff_bigobj_file_header)) {
if (Data.size() < sizeof(object::coff_file_header)) {
return make_error<JITLinkError>("Truncated COFF buffer");
}
COFFBigObjHeader =
reinterpret_cast<const object::coff_bigobj_file_header *>(Data.data() +
CurPtr);
// Verify that we are dealing with bigobj.
if (COFFBigObjHeader->Version >= COFF::BigObjHeader::MinBigObjectVersion &&
std::memcmp(COFFBigObjHeader->UUID, COFF::BigObjMagic,
sizeof(COFF::BigObjMagic)) == 0) {
COFFHeader = nullptr;
CurPtr += sizeof(object::coff_bigobj_file_header);
} else
COFFBigObjHeader = nullptr;
}
uint16_t Machine =
COFFHeader ? COFFHeader->Machine : COFFBigObjHeader->Machine;
LLVM_DEBUG({
dbgs() << "jitLink_COFF: PE = " << (IsPE ? "yes" : "no")
<< ", bigobj = " << (COFFBigObjHeader ? "yes" : "no")
<< ", identifier = \"" << ObjectBuffer.getBufferIdentifier() << "\" "
<< "machine = " << getMachineName(Machine) << "\n";
});
switch (Machine) {
case COFF::IMAGE_FILE_MACHINE_AMD64:
return createLinkGraphFromCOFFObject_x86_64(ObjectBuffer);
default:
return make_error<JITLinkError>(
"Unsupported target machine architecture in COFF object " +
ObjectBuffer.getBufferIdentifier() + ": " + getMachineName(Machine));
}
}
void link_COFF(std::unique_ptr<LinkGraph> G,
std::unique_ptr<JITLinkContext> Ctx) {
switch (G->getTargetTriple().getArch()) {
case Triple::x86_64:
link_COFF_x86_64(std::move(G), std::move(Ctx));
return;
default:
Ctx->notifyFailed(make_error<JITLinkError>(
"Unsupported target machine architecture in COFF link graph " +
G->getName()));
return;
}
}
} // end namespace jitlink
} // end namespace llvm
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