llvm-6502/include/llvm/Object/IRObjectFile.h
Peter Collingbourne 394be6c159 LTO: introduce object file-based on-disk module format.
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
2014-09-18 21:28:49 +00:00

71 lines
2.1 KiB
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//===- IRObjectFile.h - LLVM IR object file implementation ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the IRObjectFile template class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_OBJECT_IROBJECTFILE_H
#define LLVM_OBJECT_IROBJECTFILE_H
#include "llvm/Object/SymbolicFile.h"
namespace llvm {
class Mangler;
class Module;
class GlobalValue;
namespace object {
class ObjectFile;
class IRObjectFile : public SymbolicFile {
std::unique_ptr<Module> M;
std::unique_ptr<Mangler> Mang;
std::vector<std::pair<std::string, uint32_t>> AsmSymbols;
public:
IRObjectFile(MemoryBufferRef Object, std::unique_ptr<Module> M);
~IRObjectFile();
void moveSymbolNext(DataRefImpl &Symb) const override;
std::error_code printSymbolName(raw_ostream &OS,
DataRefImpl Symb) const override;
uint32_t getSymbolFlags(DataRefImpl Symb) const override;
const GlobalValue *getSymbolGV(DataRefImpl Symb) const;
basic_symbol_iterator symbol_begin_impl() const override;
basic_symbol_iterator symbol_end_impl() const override;
const Module &getModule() const {
return const_cast<IRObjectFile*>(this)->getModule();
}
Module &getModule() {
return *M;
}
static inline bool classof(const Binary *v) {
return v->isIR();
}
/// \brief Finds and returns bitcode embedded in the given object file, or an
/// error code if not found.
static ErrorOr<MemoryBufferRef> findBitcodeInObject(const ObjectFile &Obj);
/// \brief Finds and returns bitcode in the given memory buffer (which may
/// be either a bitcode file or a native object file with embedded bitcode),
/// or an error code if not found.
static ErrorOr<MemoryBufferRef>
findBitcodeInMemBuffer(MemoryBufferRef Object);
static ErrorOr<std::unique_ptr<IRObjectFile>>
createIRObjectFile(MemoryBufferRef Object, LLVMContext &Context);
};
}
}
#endif