[MachO] Introduce MinVersion API.

While introducing support for MinVersionLoadCommand in llvm-readobj I noticed there's
no API to extract Major/Minor/Update components conveniently. Currently consumers
do the bit twiddling on their own, but this will change from now on.

I'll convert llvm-objdump (and llvm-readobj) in a later commit.

Differential Revision:	 http://reviews.llvm.org/D12282
Reviewed by:	rafael

llvm-svn: 245938

1 files changed, 18 insertions, 0 deletions

diff --git a/llvm/lib/Object/MachOObjectFile.cpp b/llvm/lib/Object/MachOObjectFile.cpp
index d1faf7be3af..d287eec6c2c 100644
--- a/llvm/lib/Object/MachOObjectFile.cpp
+++ b/llvm/lib/Object/MachOObjectFile.cpp
@@ -2001,6 +2001,24 @@ MachOObjectFile::getVersionMinLoadCommand(const LoadCommandInfo &L) const {
   return getStruct<MachO::version_min_command>(this, L.Ptr);
 }
 
+uint32_t
+MachOObjectFile::getVersionMinMajor(MachO::version_min_command &C, bool SDK) {
+  uint32_t VersionOrSDK = (SDK) ? C.sdk : C.version;
+  return (VersionOrSDK >> 16) & 0xffff;
+}
+
+uint32_t
+MachOObjectFile::getVersionMinMinor(MachO::version_min_command &C, bool SDK) {
+  uint32_t VersionOrSDK = (SDK) ? C.sdk : C.version;
+  return (VersionOrSDK >> 8) & 0xff;
+}
+
+uint32_t
+MachOObjectFile::getVersionMinUpdate(MachO::version_min_command &C, bool SDK) {
+  uint32_t VersionOrSDK = (SDK) ? C.sdk : C.version;
+  return VersionOrSDK & 0xff;
+}
+
 MachO::dylib_command
 MachOObjectFile::getDylibIDLoadCommand(const LoadCommandInfo &L) const {
   return getStruct<MachO::dylib_command>(this, L.Ptr);