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4b075bb218
With this we only ask LTO to keep a C named section if there is a __start_ or __end symbol. This is not as strict as lld's --gc-sections, but is as good as we can get without having a far more detailed ir summary. llvm-svn: 309232
60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
//===- LTO.h ----------------------------------------------------*- C++ -*-===//
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//
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// The LLVM Linker
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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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// This file provides a way to combine bitcode files into one ELF
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// file by compiling them using LLVM.
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//
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// If LTO is in use, your input files are not in regular ELF files
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// but instead LLVM bitcode files. In that case, the linker has to
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// convert bitcode files into the native format so that we can create
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// an ELF file that contains native code. This file provides that
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// functionality.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLD_ELF_LTO_H
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#define LLD_ELF_LTO_H
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#include "lld/Core/LLVM.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/SmallString.h"
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#include <memory>
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#include <vector>
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namespace llvm {
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namespace lto {
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class LTO;
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}
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} // namespace llvm
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namespace lld {
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namespace elf {
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class BitcodeFile;
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class InputFile;
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class BitcodeCompiler {
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public:
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BitcodeCompiler();
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~BitcodeCompiler();
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void add(BitcodeFile &F);
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std::vector<InputFile *> compile();
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private:
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std::unique_ptr<llvm::lto::LTO> LTOObj;
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std::vector<SmallString<0>> Buff;
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std::vector<std::unique_ptr<MemoryBuffer>> Files;
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llvm::DenseSet<StringRef> UsedStartStop;
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};
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} // namespace elf
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} // namespace lld
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#endif
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