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//===- Bitcode/Writer/DXILBitcodeWriter.cpp - DXIL Bitcode Writer ---------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Bitcode writer implementation.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/ModuleSummaryIndex.h"
#include "llvm/MC/StringTableBuilder.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/MemoryBufferRef.h"
#include <map>
#include <memory>
#include <string>
#include <vector>
namespace llvm {
class BitstreamWriter;
class Module;
class raw_ostream;
namespace dxil {
class BitcodeWriter {
SmallVectorImpl<char> &Buffer;
std::unique_ptr<BitstreamWriter> Stream;
StringTableBuilder StrtabBuilder{StringTableBuilder::RAW};
// Owns any strings created by the irsymtab writer until we create the
// string table.
BumpPtrAllocator Alloc;
bool WroteStrtab = false, WroteSymtab = false;
void writeBlob(unsigned Block, unsigned Record, StringRef Blob);
std::vector<Module *> Mods;
public:
/// Create a BitcodeWriter that writes to Buffer.
BitcodeWriter(SmallVectorImpl<char> &Buffer, raw_fd_stream *FS = nullptr);
~BitcodeWriter();
/// Attempt to write a symbol table to the bitcode file. This must be called
/// at most once after all modules have been written.
///
/// A reader does not require a symbol table to interpret a bitcode file;
/// the symbol table is needed only to improve link-time performance. So
/// this function may decide not to write a symbol table. It may so decide
/// if, for example, the target is unregistered or the IR is malformed.
void writeSymtab();
/// Write the bitcode file's string table. This must be called exactly once
/// after all modules and the optional symbol table have been written.
void writeStrtab();
/// Copy the string table for another module into this bitcode file. This
/// should be called after copying the module itself into the bitcode file.
void copyStrtab(StringRef Strtab);
/// Write the specified module to the buffer specified at construction time.
void writeModule(const Module &M);
};
/// Write the specified module to the specified raw output stream.
///
/// For streams where it matters, the given stream should be in "binary"
/// mode.
void WriteDXILToFile(const Module &M, raw_ostream &Out);
} // namespace dxil
} // namespace llvm
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