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This format is simply a regular object file with the bitcode stored in a section named ".llvmbc", plus any number of other (non-allocated) sections. One immediate use case for this is to accommodate compilation processes which expect the object file to contain metadata in non-allocated sections, such as the ".go_export" section used by some Go compilers [1], although I imagine that in the future we could consider compiling parts of the module (such as large non-inlinable functions) directly into the object file to improve LTO efficiency. [1] http://golang.org/doc/install/gccgo#Imports Differential Revision: http://reviews.llvm.org/D4371 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218078 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
//===- IRObjectFile.h - LLVM IR object file implementation ------*- C++ -*-===//
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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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// This file declares the IRObjectFile template class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OBJECT_IROBJECTFILE_H
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#define LLVM_OBJECT_IROBJECTFILE_H
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#include "llvm/Object/SymbolicFile.h"
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namespace llvm {
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class Mangler;
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class Module;
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class GlobalValue;
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namespace object {
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class ObjectFile;
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class IRObjectFile : public SymbolicFile {
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std::unique_ptr<Module> M;
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std::unique_ptr<Mangler> Mang;
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std::vector<std::pair<std::string, uint32_t>> AsmSymbols;
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public:
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IRObjectFile(MemoryBufferRef Object, std::unique_ptr<Module> M);
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~IRObjectFile();
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void moveSymbolNext(DataRefImpl &Symb) const override;
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std::error_code printSymbolName(raw_ostream &OS,
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DataRefImpl Symb) const override;
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uint32_t getSymbolFlags(DataRefImpl Symb) const override;
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const GlobalValue *getSymbolGV(DataRefImpl Symb) const;
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basic_symbol_iterator symbol_begin_impl() const override;
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basic_symbol_iterator symbol_end_impl() const override;
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const Module &getModule() const {
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return const_cast<IRObjectFile*>(this)->getModule();
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}
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Module &getModule() {
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return *M;
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}
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static inline bool classof(const Binary *v) {
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return v->isIR();
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}
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/// \brief Finds and returns bitcode embedded in the given object file, or an
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/// error code if not found.
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static ErrorOr<MemoryBufferRef> findBitcodeInObject(const ObjectFile &Obj);
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/// \brief Finds and returns bitcode in the given memory buffer (which may
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/// be either a bitcode file or a native object file with embedded bitcode),
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/// or an error code if not found.
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static ErrorOr<MemoryBufferRef>
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findBitcodeInMemBuffer(MemoryBufferRef Object);
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static ErrorOr<std::unique_ptr<IRObjectFile>>
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createIRObjectFile(MemoryBufferRef Object, LLVMContext &Context);
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};
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}
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}
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#endif
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