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
llvm-svn: 218078
diff --git a/llvm/lib/Object/SymbolicFile.cpp b/llvm/lib/Object/SymbolicFile.cpp
index f8dd4b3..9dfb09d 100644
--- a/llvm/lib/Object/SymbolicFile.cpp
+++ b/llvm/lib/Object/SymbolicFile.cpp
@@ -40,11 +40,9 @@
case sys::fs::file_magic::macho_universal_binary:
case sys::fs::file_magic::windows_resource:
return object_error::invalid_file_type;
- case sys::fs::file_magic::elf_relocatable:
case sys::fs::file_magic::elf_executable:
case sys::fs::file_magic::elf_shared_object:
case sys::fs::file_magic::elf_core:
- case sys::fs::file_magic::macho_object:
case sys::fs::file_magic::macho_executable:
case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
case sys::fs::file_magic::macho_core:
@@ -54,10 +52,26 @@
case sys::fs::file_magic::macho_bundle:
case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
case sys::fs::file_magic::macho_dsym_companion:
- case sys::fs::file_magic::coff_object:
case sys::fs::file_magic::coff_import_library:
case sys::fs::file_magic::pecoff_executable:
return ObjectFile::createObjectFile(Object, Type);
+ case sys::fs::file_magic::elf_relocatable:
+ case sys::fs::file_magic::macho_object:
+ case sys::fs::file_magic::coff_object: {
+ ErrorOr<std::unique_ptr<ObjectFile>> Obj =
+ ObjectFile::createObjectFile(Object, Type);
+ if (!Obj || !Context)
+ return std::move(Obj);
+
+ ErrorOr<MemoryBufferRef> BCData =
+ IRObjectFile::findBitcodeInObject(*Obj->get());
+ if (!BCData)
+ return std::move(Obj);
+
+ return IRObjectFile::createIRObjectFile(
+ MemoryBufferRef(BCData->getBuffer(), Object.getBufferIdentifier()),
+ *Context);
+ }
}
llvm_unreachable("Unexpected Binary File Type");
}