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