Commit Graph

56 Commits

Author SHA1 Message Date
Joey Gouly 9d263e0afe Fix some indentation issues, I saw while reading this file.
llvm-svn: 198024
2013-12-25 19:39:08 +00:00
Rui Ueyama 170a1a892e Run clang-format on r197727.
llvm-svn: 197788
2013-12-20 07:48:29 +00:00
Nick Kledzik e555277780 [lld] Introduce registry and Reference kind tuple
The main changes are in:
  include/lld/Core/Reference.h
  include/lld/ReaderWriter/Reader.h
Everything else is details to support the main change.

1) Registration based Readers
Previously, lld had a tangled interdependency with all the Readers.  It would
have been impossible to make a streamlined linker (say for a JIT) which
just supported one file format and one architecture (no yaml, no archives, etc).
The old model also required a LinkingContext to read an object file, which
would have made .o inspection tools awkward.

The new model is that there is a global Registry object. You programmatically 
register the Readers you want with the registry object. Whenever you need to 
read/parse a file, you ask the registry to do it, and the registry tries each 
registered reader.

For ease of use with the existing lld code base, there is one Registry
object inside the LinkingContext object. 


2) Changing kind value to be a tuple
Beside Readers, the registry also keeps track of the mapping for Reference
Kind values to and from strings.  Along with that, this patch also fixes
an ambiguity with the previous Reference::Kind values.  The problem was that
we wanted to reuse existing relocation type values as Reference::Kind values.
But then how can the YAML write know how to convert a value to a string? The
fix is to change the 32-bit Reference::Kind into a tuple with an 8-bit namespace
(e.g. ELF, COFFF, etc), an 8-bit architecture (e.g. x86_64, PowerPC, etc), and
a 16-bit value.  This tuple system allows conversion to and from strings with 
no ambiguities.

llvm-svn: 197727
2013-12-19 21:58:00 +00:00
Nick Kledzik 020fa7f080 [mach-o] add llvm_unreachable
llvm-svn: 194172
2013-11-06 22:18:09 +00:00
Nick Kledzik 020a49c95d [mach-o] fix DEBUG_WITH_TYPE to compile without warnings in non-debug case
llvm-svn: 194171
2013-11-06 21:57:52 +00:00
Nick Kledzik e34182f396 [mach-o] binary reader and writer
This patch adds support for converting normalized mach-o to and from binary
mach-o. It also changes WriterMachO (which previously directly wrote a 
mach-o binary given a set of Atoms) to instead do it in two steps. The first 
step uses normalizedFromAtoms() to convert Atoms to normalized mach-o, and the
second step uses writeBinary() which to generate the mach-o binary file.  

llvm-svn: 194167
2013-11-06 21:36:55 +00:00