Add printing the LC_SUB_CLIENT load command with llvm-objdump’s -private-headers.

llvm-svn: 224616

llvm/include/llvm/Object/MachO.h

@@ -374,6 +374,8 @@ public:
   getSubUmbrellaCommand(const LoadCommandInfo &L) const;
   MachO::sub_library_command
   getSubLibraryCommand(const LoadCommandInfo &L) const;
+  MachO::sub_client_command
+  getSubClientCommand(const LoadCommandInfo &L) const;
 
   MachO::any_relocation_info getRelocation(DataRefImpl Rel) const;
   MachO::data_in_code_entry getDice(DataRefImpl Rel) const;

llvm/include/llvm/Support/MachO.h

@@ -1125,6 +1125,12 @@ namespace llvm {
       sys::swapByteOrder(s.sub_library);
     }
 
+    inline void swapStruct(sub_client_command &s) {
+      sys::swapByteOrder(s.cmd);
+      sys::swapByteOrder(s.cmdsize);
+      sys::swapByteOrder(s.client);
+    }
+
     inline void swapStruct(dylinker_command &d) {
       sys::swapByteOrder(d.cmd);
       sys::swapByteOrder(d.cmdsize);

llvm/lib/Object/MachOObjectFile.cpp

@@ -2327,6 +2327,11 @@ MachOObjectFile::getSubLibraryCommand(const LoadCommandInfo &L) const {
   return getStruct<MachO::sub_library_command>(this, L.Ptr);
 }
 
+MachO::sub_client_command
+MachOObjectFile::getSubClientCommand(const LoadCommandInfo &L) const {
+  return getStruct<MachO::sub_client_command>(this, L.Ptr);
+}
+
 MachO::any_relocation_info
 MachOObjectFile::getRelocation(DataRefImpl Rel) const {
   DataRefImpl Sec;

llvm/test/tools/llvm-objdump/X86/macho-private-headers.test

@@ -11,6 +11,8 @@
 // RUN:     | FileCheck %s -check-prefix=SUB_UMB
 // RUN: llvm-objdump -p %p/Inputs/dylibSubLibrary.macho-x86_64 \
 // RUN:     | FileCheck %s -check-prefix=SUB_LIB
+// RUN: llvm-objdump -p %p/Inputs/dylibSubClient.macho-x86_64 \
+// RUN:     | FileCheck %s -check-prefix=SUB_CLI
 
 CHECK: Mach header
 CHECK:       magic cputype cpusubtype  caps    filetype ncmds sizeofcmds      flags
@@ -400,3 +402,8 @@ SUB_LIB: Load command 5
 SUB_LIB:           cmd LC_SUB_LIBRARY
 SUB_LIB:       cmdsize 20
 SUB_LIB:   sub_library libfoo (offset 12)
+
+SUB_CLI: Load command 10
+SUB_CLI:           cmd LC_SUB_CLIENT
+SUB_CLI:       cmdsize 16
+SUB_CLI:        client bar (offset 12)

llvm/tools/llvm-objdump/MachODump.cpp

@@ -3722,6 +3722,21 @@ static void PrintSubLibraryCommand(MachO::sub_library_command sub,
   }
 }
 
+static void PrintSubClientCommand(MachO::sub_client_command sub,
+                                  const char *Ptr) {
+  outs() << "          cmd LC_SUB_CLIENT\n";
+  outs() << "      cmdsize " << sub.cmdsize;
+  if (sub.cmdsize < sizeof(struct MachO::sub_client_command))
+    outs() << " Incorrect size\n";
+  else
+    outs() << "\n";
+  if (sub.client < sub.cmdsize) {
+    const char *P = Ptr + sub.client;
+    outs() << "       client " << P << " (offset " << sub.client << ")\n";
+  } else {
+    outs() << "       client ?(bad offset " << sub.client << ")\n";
+  }
+}
 
 static void PrintDylibCommand(MachO::dylib_command dl, const char *Ptr) {
   if (dl.cmd == MachO::LC_ID_DYLIB)
@@ -3888,6 +3903,9 @@ static void PrintLoadCommands(const MachOObjectFile *Obj, uint32_t ncmds,
     } else if (Command.C.cmd == MachO::LC_SUB_LIBRARY) {
       MachO::sub_library_command Sl = Obj->getSubLibraryCommand(Command);
       PrintSubLibraryCommand(Sl, Command.Ptr);
+    } else if (Command.C.cmd == MachO::LC_SUB_CLIENT) {
+      MachO::sub_client_command Sc = Obj->getSubClientCommand(Command);
+      PrintSubClientCommand(Sc, Command.Ptr);
     } else if (Command.C.cmd == MachO::LC_LOAD_DYLIB ||
                Command.C.cmd == MachO::LC_ID_DYLIB ||
                Command.C.cmd == MachO::LC_LOAD_WEAK_DYLIB ||