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//===-------------- MachO.cpp - JIT linker function for MachO -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// MachO jit-link function.
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/JITLink/MachO.h"
#include "llvm/BinaryFormat/MachO.h"
#include "llvm/ExecutionEngine/JITLink/MachO_arm64.h"
#include "llvm/ExecutionEngine/JITLink/MachO_x86_64.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SwapByteOrder.h"
using namespace llvm;
#define DEBUG_TYPE "jitlink"
namespace llvm {
namespace jitlink {
void jitLink_MachO(std::unique_ptr<JITLinkContext> Ctx) {
// We don't want to do full MachO validation here. Just parse enough of the
// header to find out what MachO linker to use.
StringRef Data = Ctx->getObjectBuffer().getBuffer();
if (Data.size() < 4) {
StringRef BufferName = Ctx->getObjectBuffer().getBufferIdentifier();
Ctx->notifyFailed(make_error<JITLinkError>("Truncated MachO buffer \"" +
BufferName + "\""));
return;
}
uint32_t Magic;
memcpy(&Magic, Data.data(), sizeof(uint32_t));
LLVM_DEBUG({
dbgs() << "jitLink_MachO: magic = " << format("0x%08" PRIx32, Magic)
<< ", identifier = \""
<< Ctx->getObjectBuffer().getBufferIdentifier() << "\"\n";
});
if (Magic == MachO::MH_MAGIC || Magic == MachO::MH_CIGAM) {
Ctx->notifyFailed(
make_error<JITLinkError>("MachO 32-bit platforms not supported"));
return;
} else if (Magic == MachO::MH_MAGIC_64 || Magic == MachO::MH_CIGAM_64) {
if (Data.size() < sizeof(MachO::mach_header_64)) {
StringRef BufferName = Ctx->getObjectBuffer().getBufferIdentifier();
Ctx->notifyFailed(make_error<JITLinkError>("Truncated MachO buffer \"" +
BufferName + "\""));
return;
}
// Read the CPU type from the header.
uint32_t CPUType;
memcpy(&CPUType, Data.data() + 4, sizeof(uint32_t));
if (Magic == MachO::MH_CIGAM_64)
CPUType = ByteSwap_32(CPUType);
LLVM_DEBUG({
dbgs() << "jitLink_MachO: cputype = " << format("0x%08" PRIx32, CPUType)
<< "\n";
});
switch (CPUType) {
case MachO::CPU_TYPE_ARM64:
return jitLink_MachO_arm64(std::move(Ctx));
case MachO::CPU_TYPE_X86_64:
return jitLink_MachO_x86_64(std::move(Ctx));
}
Ctx->notifyFailed(make_error<JITLinkError>("MachO-64 CPU type not valid"));
return;
}
Ctx->notifyFailed(make_error<JITLinkError>("MachO magic not valid"));
}
} // end namespace jitlink
} // end namespace llvm
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