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[JITLink] Read MachO Header CPU field only in jitLink_MachO.
It's the only field we need in this function.
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@ -16,9 +16,9 @@
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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/Endian.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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@ -34,7 +34,9 @@ void jitLink_MachO(std::unique_ptr<JITLinkContext> Ctx) {
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StringRef Data = Ctx->getObjectBuffer().getBuffer();
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if (Data.size() < 4) {
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Ctx->notifyFailed(make_error<JITLinkError>("Truncated MachO buffer"));
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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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@ -51,20 +53,26 @@ void jitLink_MachO(std::unique_ptr<JITLinkContext> Ctx) {
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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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MachO::mach_header_64 Header;
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memcpy(&Header, Data.data(), sizeof(MachO::mach_header_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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swapStruct(Header);
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ByteSwap_32(CPUType);
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LLVM_DEBUG({
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dbgs() << "jitLink_MachO: cputype = "
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<< format("0x%08" PRIx32, Header.cputype)
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<< ", cpusubtype = " << format("0x%08" PRIx32, Header.cpusubtype)
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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 (Header.cputype) {
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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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