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//===- Offloading.cpp - Utilities for handling offloading code -*- C++ -*-===//
//
// 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/Object/OffloadBinary.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/BinaryFormat/Magic.h"
#include "llvm/MC/StringTableBuilder.h"
#include "llvm/Object/Error.h"
#include "llvm/Support/FileOutputBuffer.h"
using namespace llvm;
using namespace llvm::object;
Expected<std::unique_ptr<OffloadBinary>>
OffloadBinary::create(MemoryBufferRef Buf) {
if (Buf.getBufferSize() < sizeof(Header) + sizeof(Entry))
return errorCodeToError(object_error::parse_failed);
// Check for 0x10FF1OAD magic bytes.
if (identify_magic(Buf.getBuffer()) != file_magic::offload_binary)
return errorCodeToError(object_error::parse_failed);
const char *Start = Buf.getBufferStart();
const Header *TheHeader = reinterpret_cast<const Header *>(Start);
if (TheHeader->Version != OffloadBinary::Version)
return errorCodeToError(object_error::parse_failed);
if (TheHeader->Size > Buf.getBufferSize() ||
TheHeader->EntryOffset > TheHeader->Size - sizeof(Entry) ||
TheHeader->EntrySize > TheHeader->Size - sizeof(Header))
return errorCodeToError(object_error::unexpected_eof);
const Entry *TheEntry =
reinterpret_cast<const Entry *>(&Start[TheHeader->EntryOffset]);
if (TheEntry->ImageOffset > Buf.getBufferSize() ||
TheEntry->StringOffset > Buf.getBufferSize())
return errorCodeToError(object_error::unexpected_eof);
return std::unique_ptr<OffloadBinary>(
new OffloadBinary(Buf, TheHeader, TheEntry));
}
std::unique_ptr<MemoryBuffer>
OffloadBinary::write(const OffloadingImage &OffloadingData) {
// Create a null-terminated string table with all the used strings.
StringTableBuilder StrTab(StringTableBuilder::ELF);
for (auto &KeyAndValue : OffloadingData.StringData) {
StrTab.add(KeyAndValue.getKey());
StrTab.add(KeyAndValue.getValue());
}
StrTab.finalize();
uint64_t StringEntrySize =
sizeof(StringEntry) * OffloadingData.StringData.size();
// Make sure the image we're wrapping around is aligned as well.
uint64_t BinaryDataSize = alignTo(sizeof(Header) + sizeof(Entry) +
StringEntrySize + StrTab.getSize(),
getAlignment());
// Create the header and fill in the offsets. The entry will be directly
// placed after the header in memory. Align the size to the alignment of the
// header so this can be placed contiguously in a single section.
Header TheHeader;
TheHeader.Size = alignTo(
BinaryDataSize + OffloadingData.Image->getBufferSize(), getAlignment());
TheHeader.EntryOffset = sizeof(Header);
TheHeader.EntrySize = sizeof(Entry);
// Create the entry using the string table offsets. The string table will be
// placed directly after the entry in memory, and the image after that.
Entry TheEntry;
TheEntry.TheImageKind = OffloadingData.TheImageKind;
TheEntry.TheOffloadKind = OffloadingData.TheOffloadKind;
TheEntry.Flags = OffloadingData.Flags;
TheEntry.StringOffset = sizeof(Header) + sizeof(Entry);
TheEntry.NumStrings = OffloadingData.StringData.size();
TheEntry.ImageOffset = BinaryDataSize;
TheEntry.ImageSize = OffloadingData.Image->getBufferSize();
SmallVector<char> Data;
Data.reserve(TheHeader.Size);
raw_svector_ostream OS(Data);
OS << StringRef(reinterpret_cast<char *>(&TheHeader), sizeof(Header));
OS << StringRef(reinterpret_cast<char *>(&TheEntry), sizeof(Entry));
for (auto &KeyAndValue : OffloadingData.StringData) {
uint64_t Offset = sizeof(Header) + sizeof(Entry) + StringEntrySize;
StringEntry Map{Offset + StrTab.getOffset(KeyAndValue.getKey()),
Offset + StrTab.getOffset(KeyAndValue.getValue())};
OS << StringRef(reinterpret_cast<char *>(&Map), sizeof(StringEntry));
}
StrTab.write(OS);
// Add padding to required image alignment.
OS.write_zeros(TheEntry.ImageOffset - OS.tell());
OS << OffloadingData.Image->getBuffer();
// Add final padding to required alignment.
assert(TheHeader.Size >= OS.tell() && "Too much data written?");
OS.write_zeros(TheHeader.Size - OS.tell());
assert(TheHeader.Size == OS.tell() && "Size mismatch");
return MemoryBuffer::getMemBufferCopy(OS.str());
}
OffloadKind object::getOffloadKind(StringRef Name) {
return llvm::StringSwitch<OffloadKind>(Name)
.Case("openmp", OFK_OpenMP)
.Case("cuda", OFK_Cuda)
.Case("hip", OFK_HIP)
.Default(OFK_None);
}
StringRef object::getOffloadKindName(OffloadKind Kind) {
switch (Kind) {
case OFK_OpenMP:
return "openmp";
case OFK_Cuda:
return "cuda";
case OFK_HIP:
return "hip";
default:
return "none";
}
}
ImageKind object::getImageKind(StringRef Name) {
return llvm::StringSwitch<ImageKind>(Name)
.Case("o", IMG_Object)
.Case("bc", IMG_Bitcode)
.Case("cubin", IMG_Cubin)
.Case("fatbin", IMG_Fatbinary)
.Case("s", IMG_PTX)
.Default(IMG_None);
}
StringRef object::getImageKindName(ImageKind Kind) {
switch (Kind) {
case IMG_Object:
return "o";
case IMG_Bitcode:
return "bc";
case IMG_Cubin:
return "cubin";
case IMG_Fatbinary:
return "fatbin";
case IMG_PTX:
return "s";
default:
return "";
}
}
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