llvm-mc: Start MCAssembler and MCMachOStreamer.

 - Together these form the (Mach-O) back end of the assembler.

 - MCAssembler is the actual assembler backend, which is designed to have a
   reasonable API. This will eventually grow to support multiple object file
   implementations, but for now its Mach-O/i386 only.

 - MCMachOStreamer adapts the MCStreamer "actions" API to the MCAssembler API,
   e.g. converting the various directives into fragments, managing state like
   the current section, and so on.

 - llvm-mc will use the new backend via '-filetype=obj', which may eventually
   be, but is not yet, since I hear that people like assemblers which actually
   assemble.

 - The only thing that works at the moment is changing sections. For the time
   being I have a Python Mach-O dumping tool in test/scripts so this stuff can
   be easily tested, eventually I expect to replace this with a real LLVM tool.

 - More doxyments to come.

I assume that since this stuff doesn't touch any of the things which are part of
2.6 that it is ok to put this in not so long before the freeze, but if someone
objects let me know, I can pull it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79612 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 694 insertions, 0 deletions

diff --git a/test/MC/MachO/dg.exp b/test/MC/MachO/dg.exp
new file mode 100644
index 0000000000..ebd84187f5
--- /dev/null
+++ b/test/MC/MachO/dg.exp
@@ -0,0 +1,3 @@
+load_lib llvm.exp
+
+RunLLVMTests [lsort [glob -nocomplain $srcdir/$subdir/*.{s}]]
diff --git a/test/MC/MachO/sections.s b/test/MC/MachO/sections.s
new file mode 100644
index 0000000000..7b7f9a1e43
--- /dev/null
+++ b/test/MC/MachO/sections.s
@@ -0,0 +1,532 @@
+// RUN: llvm-mc %s -filetype=obj -o - | macho-dump | FileCheck %s
+
+        .const
+        .static_const
+        .cstring
+        .literal4
+        .literal8
+        .literal16
+        .constructor
+        .destructor
+        .symbol_stub
+        .picsymbol_stub
+        .data
+        .static_data
+        .non_lazy_symbol_pointer
+        .lazy_symbol_pointer
+        .dyld
+        .mod_init_func
+        .mod_term_func
+        .const_data
+        .objc_class
+        .objc_meta_class
+        .objc_cat_cls_meth
+        .objc_cat_inst_meth
+        .objc_protocol
+        .objc_string_object
+        .objc_cls_meth
+        .objc_inst_meth
+        .objc_cls_refs
+        .objc_message_refs
+        .objc_symbols
+        .objc_category
+        .objc_class_vars
+        .objc_instance_vars
+        .objc_module_info
+
+// FIXME: These are aliases for __TEXT, __cstring which we don't properly unique
+//	yet.
+//        .objc_class_names
+//        .objc_meth_var_types
+//        .objc_meth_var_names
+        
+        .objc_selector_strs
+
+
+// CHECK: ('cputype', 7)
+// CHECK: ('cpusubtype', 3)
+// CHECK: ('filetype', 1)
+// CHECK: ('num_load_commands', 1)
+// CHECK: ('load_commands_size', 2436)
+// CHECK: ('flag', 0)
+// CHECK: ('load_commands', [
+// CHECK:   # Load Command 0
+// CHECK:  (('command', 1)
+// CHECK:   ('size', 2436)
+// CHECK:   ('segment_name', '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:   ('vm_addr', 0)
+// CHECK:   ('vm_size', 0)
+// CHECK:   ('file_offset', 2464)
+// CHECK:   ('file_size', 0)
+// CHECK:   ('maxprot', 7)
+// CHECK:   ('initprot', 7)
+// CHECK:   ('num_sections', 35)
+// CHECK:   ('flags', 0)
+// CHECK:   ('sections', [
+// CHECK:     # Section 0
+// CHECK:    (('section_name', '__text\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x80000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 1
+// CHECK:    (('section_name', '__const\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x0)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 2
+// CHECK:    (('section_name', '__static_const\x00\x00')
+// CHECK:     ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x0)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 3
+// CHECK:    (('section_name', '__cstring\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x2)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 4
+// CHECK:    (('section_name', '__literal4\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+        // FIXME: We aren't setting alignment correctly yet.
+// CHECX:     ('alignment', 2)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x3)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 5
+// CHECK:    (('section_name', '__literal8\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+        // FIXME: We aren't setting alignment correctly yet.
+// CHECX:     ('alignment', 3)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x4)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 6
+// CHECK:    (('section_name', '__literal16\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+        // FIXME: We aren't setting alignment correctly yet.
+// CHECX:     ('alignment', 4)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0xe)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 7
+// CHECK:    (('section_name', '__constructor\x00\x00\x00')
+// CHECK:     ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x0)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 8
+// CHECK:    (('section_name', '__destructor\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x0)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 9
+// CHECK:    (('section_name', '__symbol_stub\x00\x00\x00')
+// CHECK:     ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x80000008)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 16)
+// CHECK:    ),
+// CHECK:     # Section 10
+// CHECK:    (('section_name', '__picsymbol_stub')
+// CHECK:     ('segment_name', '__TEXT\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x80000008)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 26)
+// CHECK:    ),
+// CHECK:     # Section 11
+// CHECK:    (('section_name', '__data\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x0)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 12
+// CHECK:    (('section_name', '__static_data\x00\x00\x00')
+// CHECK:     ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x0)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 13
+// CHECK:    (('section_name', '__nl_symbol_ptr\x00')
+// CHECK:     ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+        // FIXME: We aren't setting alignment correctly yet.
+// CHECX:     ('alignment', 2)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x6)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 14
+// CHECK:    (('section_name', '__la_symbol_ptr\x00')
+// CHECK:     ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+        // FIXME: We aren't setting alignment correctly yet.
+// CHECX:     ('alignment', 2)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x7)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 15
+// CHECK:    (('section_name', '__dyld\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x0)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 16
+// CHECK:    (('section_name', '__mod_init_func\x00')
+// CHECK:     ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+        // FIXME: We aren't setting alignment correctly yet.
+// CHECX:     ('alignment', 2)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x9)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 17
+// CHECK:    (('section_name', '__mod_term_func\x00')
+// CHECK:     ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+        // FIXME: We aren't setting alignment correctly yet.
+// CHECX:     ('alignment', 2)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0xa)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 18
+// CHECK:    (('section_name', '__const\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__DATA\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x0)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 19
+// CHECK:    (('section_name', '__class\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 20
+// CHECK:    (('section_name', '__meta_class\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 21
+// CHECK:    (('section_name', '__cat_cls_meth\x00\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 22
+// CHECK:    (('section_name', '__cat_inst_meth\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 23
+// CHECK:    (('section_name', '__protocol\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 24
+// CHECK:    (('section_name', '__string_object\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 25
+// CHECK:    (('section_name', '__cls_meth\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 26
+// CHECK:    (('section_name', '__inst_meth\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 27
+// CHECK:    (('section_name', '__cls_refs\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+        // FIXME: We aren't setting alignment correctly yet.
+// CHECX:     ('alignment', 2)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000005)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 28
+// CHECK:    (('section_name', '__message_refs\x00\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+        // FIXME: We aren't setting alignment correctly yet.
+// CHECX:     ('alignment', 2)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000005)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 29
+// CHECK:    (('section_name', '__symbols\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 30
+// CHECK:    (('section_name', '__category\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 31
+// CHECK:    (('section_name', '__class_vars\x00\x00\x00\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 32
+// CHECK:    (('section_name', '__instance_vars\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 33
+// CHECK:    (('section_name', '__module_info\x00\x00\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x10000000)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:     # Section 34
+// CHECK:    (('section_name', '__selector_strs\x00')
+// CHECK:     ('segment_name', '__OBJC\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+// CHECK:     ('address', 0)
+// CHECK:     ('size', 0)
+// CHECK:     ('offset', 2464)
+// CHECK:     ('alignment', 0)
+// CHECK:     ('reloc_offset', 0)
+// CHECK:     ('num_reloc', 0)
+// CHECK:     ('flags', 0x2)
+// CHECK:     ('reserved1', 0)
+// CHECK:     ('reserved2', 0)
+// CHECK:    ),
+// CHECK:   ])
+// CHECK:  ),
+// CHECK: ])
diff --git a/test/Scripts/macho-dump b/test/Scripts/macho-dump
new file mode 100755
index 0000000000..e844197a6c
--- /dev/null
+++ b/test/Scripts/macho-dump
@@ -0,0 +1,159 @@
+#!/usr/bin/env python
+
+import struct
+import sys
+
+class Reader:
+   def __init__(self, path):
+      if path == '-':
+         self.file = sys.stdin
+      else:
+         self.file = open(path,'rb')
+      self.isLSB = None
+      self.pos = 0
+
+   def setLSB(self, isLSB):
+      self.isLSB = bool(isLSB)
+
+   def tell(self):
+      return self.pos
+
+   def read(self, N):
+      data = self.file.read(N)
+      self.pos += len(data)
+      if len(data) != N:
+         raise ValueError,"Out of data!"
+      return data
+
+   def read32(self):
+      return struct.unpack('><'[self.isLSB] + 'I', self.read(4))[0]
+
+def dumpmacho(path, opts):
+   f = Reader(path)
+
+   magic = f.read(4)
+   if magic == '\xFE\xED\xFA\xCE':
+      f.setLSB(False)
+   elif magic == '\xCE\xFA\xED\xFE':
+      f.setLSB(True)
+   else:
+      raise ValueError,"Not a Mach-O object file: %r (bad magic)" % path
+
+   print "('cputype', %r)" % f.read32()
+   print "('cpusubtype', %r)" % f.read32()
+   filetype = f.read32()
+   print "('filetype', %r)" % filetype
+   
+   numLoadCommands = f.read32()
+   print "('num_load_commands', %r)" % filetype
+
+   loadCommandsSize = f.read32()
+   print "('load_commands_size', %r)" % loadCommandsSize
+
+   print "('flag', %r)" % f.read32()
+
+   start = f.tell()
+
+   print "('load_commands', ["
+   for i in range(numLoadCommands):
+      dumpLoadCommand(f, i, opts)
+   print "])"
+
+   if f.tell() - start != loadCommandsSize:
+      raise ValueError,"%s: warning: invalid load commands size: %r" % (sys.argv, loadCommandsSize)
+
+def dumpLoadCommand(f, i, opts):
+   start = f.tell()
+
+   print "  # Load Command %r" % i
+   cmd = f.read32()
+   print " (('command', %r)" % cmd
+   cmdSize = f.read32()
+   print "  ('size', %r)" % cmdSize
+
+   if cmd == 1:
+      dumpSegmentLoadCommand32(f, opts)
+   elif cmd == 2:
+      dumpSymtabCommand(f, opts)
+   elif cmd == 11:
+      dumpDysymtabCommand(f, opts)
+   else:
+      print >>sys.stderr,"%s: warning: unknown load command: %r" % (sys.argv[0], cmd)
+      f.read(cmdSize - 8)
+   print " ),"
+
+   if f.tell() - start != cmdSize:
+      raise ValueError,"%s: warning: invalid load command size: %r" % (sys.argv, cmdSize)
+
+def dumpSegmentLoadCommand32(f, opts):
+   print "  ('segment_name', %r)" % f.read(16) 
+   print "  ('vm_addr', %r)" % f.read32()
+   print "  ('vm_size', %r)" % f.read32()
+   print "  ('file_offset', %r)" % f.read32()
+   print "  ('file_size', %r)" % f.read32()
+   print "  ('maxprot', %r)" % f.read32()
+   print "  ('initprot', %r)" % f.read32()
+   numSections = f.read32()
+   print "  ('num_sections', %r)" % numSections
+   print "  ('flags', %r)" % f.read32()
+
+   print "  ('sections', ["
+   for i in range(numSections):
+      dumpSection32(f, i, opts)
+   print "  ])"
+
+def dumpSymtabCommand(f, opts):
+   print "  ('symoff', %r)" % f.read32()
+   print "  ('nsyms', %r)" % f.read32()
+   print "  ('stroff', %r)" % f.read32()
+   print "  ('strsize', %r)" % f.read32()
+
+def dumpDysymtabCommand(f, opts):   
+   print "  ('ilocalsym', %r)" % f.read32()
+   print "  ('nlocalsym', %r)" % f.read32()
+   print "  ('iextdefsym', %r)" % f.read32()
+   print "  ('nextdefsym', %r)" % f.read32()
+   print "  ('iundefsym', %r)" % f.read32()
+   print "  ('nundefsym', %r)" % f.read32()
+   print "  ('tocoff', %r)" % f.read32()
+   print "  ('ntoc', %r)" % f.read32()
+   print "  ('modtaboff', %r)" % f.read32()
+   print "  ('nmodtab', %r)" % f.read32()
+   print "  ('extrefsymoff', %r)" % f.read32()
+   print "  ('nextrefsyms', %r)" % f.read32()
+   print "  ('indirectsymoff', %r)" % f.read32()
+   print "  ('nindirectsyms', %r)" % f.read32()
+   print "  ('extreloff', %r)" % f.read32()
+   print "  ('nextrel', %r)" % f.read32()
+   print "  ('locreloff', %r)" % f.read32()
+   print "  ('nlocrel', %r)" % f.read32()
+
+def dumpSection32(f, i, opts):
+   print "    # Section %r" % i
+   print "   (('section_name', %r)" % f.read(16)
+   print "    ('segment_name', %r)" % f.read(16)
+   print "    ('address', %r)" % f.read32()
+   print "    ('size', %r)" % f.read32()
+   print "    ('offset', %r)" % f.read32()
+   print "    ('alignment', %r)" % f.read32()
+   print "    ('reloc_offset', %r)" % f.read32()
+   print "    ('num_reloc', %r)" % f.read32()
+   print "    ('flags', %#x)" % f.read32()
+   print "    ('reserved1', %r)" % f.read32()
+   print "    ('reserved2', %r)" % f.read32()
+   print "   ),"
+   
+def main():
+    from optparse import OptionParser, OptionGroup
+    parser = OptionParser("usage: %prog [options] {files}")
+
+    (opts, args) = parser.parse_args()
+
+    if not args:
+       args.append('-')
+
+    for arg in args:
+       dumpmacho(arg, opts)
+
+if __name__ == '__main__':
+   main()