Refactor data-in-code annotations.

Use a dedicated MachO load command to annotate data-in-code regions.
This is the same format the linker produces for final executable images,
allowing consistency of representation and use of introspection tools
for both object and executable files.

Data-in-code regions are annotated via ".data_region"/".end_data_region"
directive pairs, with an optional region type.

data_region_directive := ".data_region" { region_type }
region_type := "jt8" | "jt16" | "jt32" | "jta32"
end_data_region_directive := ".end_data_region"

The previous handling of ARM-style "$d.*" labels was broken and has
been removed. Specifically, it didn't handle ARM vs. Thumb mode when
marking the end of the section.

rdar://11459456

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157062 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 0 deletions

diff --git a/include/llvm/MC/MCDirectives.h b/include/llvm/MC/MCDirectives.h
index 9180d1b369..0461766c2f 100644
--- a/include/llvm/MC/MCDirectives.h
+++ b/include/llvm/MC/MCDirectives.h
@@ -52,6 +52,14 @@ enum MCAssemblerFlag {
   MCAF_Code64                 ///< .code64 (X86)
 };
 
+enum MCDataRegionType {
+  MCDR_DataRegion,            ///< .data_region
+  MCDR_DataRegionJT8,         ///< .data_region jt8
+  MCDR_DataRegionJT16,        ///< .data_region jt16
+  MCDR_DataRegionJT32,        ///< .data_region jt32
+  MCDR_DataRegionEnd          ///< .end_data_region
+};
+
 } // end namespace llvm
 
 #endif