6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-29 13:24:25 +00:00
Code Issues Projects Releases Wiki Activity

LTO: introduce object file-based on-disk module format.

Browse Source 
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
This commit is contained in:
Peter Collingbourne
2014-09-18 21:28:49 +00:00
parent 65edced76b
commit 394be6c159
15 changed files with 178 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
lib/Object/SymbolicFile.cpp
View File

@ -40,11 +40,9 @@ ErrorOr<std::unique_ptr<SymbolicFile>> SymbolicFile::createSymbolicFile(
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 @@ ErrorOr<std::unique_ptr<SymbolicFile>> SymbolicFile::createSymbolicFile(
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");
}