[obj2yaml] [yaml2obj] Support for MachO load command structures

This adds support for all the MachO *_command structures. The load_command payloads still are not represented, but that will come next.

llvm-svn: 269782

1 files changed, 26 insertions, 10 deletions

diff --git a/llvm/tools/yaml2obj/yaml2macho.cpp b/llvm/tools/yaml2obj/yaml2macho.cpp
index ed243a2cdd9..bf891a6e983 100644
--- a/llvm/tools/yaml2obj/yaml2macho.cpp
+++ b/llvm/tools/yaml2obj/yaml2macho.cpp
@@ -79,17 +79,33 @@ Error MachOWriter::writeHeader(raw_ostream &OS) {
 
 Error MachOWriter::writeLoadCommands(raw_ostream &OS) {
   for (auto &LC : Obj.LoadCommands) {
-    MachO::load_command LCTemp;
-    LCTemp.cmd = LC->cmd;
-    LCTemp.cmdsize = LC->cmdsize;
-    OS.write(reinterpret_cast<const char *>(&LCTemp),
-             sizeof(MachO::load_command));
-    auto remaining_size = LC->cmdsize - sizeof(MachO::load_command);
-    if (remaining_size > 0) {
+    size_t BytesWritten = 0;
+#define HANDLE_LOAD_COMMAND(LCName, LCValue, LCStruct)                         \
+  case MachO::LCName:                                                          \
+    OS.write(reinterpret_cast<const char *>(&(LC.load_command_data.LCStruct)), \
+             sizeof(MachO::LCStruct));                                         \
+    BytesWritten = sizeof(MachO::LCStruct);                                    \
+    break;
+
+    switch (LC.load_command_data.load_command.cmd) {
+    default:
+      OS.write(
+          reinterpret_cast<const char *>(&(LC.load_command_data.load_command)),
+          sizeof(MachO::load_command));
+      BytesWritten = sizeof(MachO::load_command);
+      break;
+#include "llvm/Support/MachO.def"
+    }
+
+    auto BytesRemaining =
+        LC.load_command_data.load_command.cmdsize - BytesWritten;
+    if (BytesRemaining > 0) {
       // TODO: Replace all this once the load command data is present in yaml.
-      std::vector<char> fill_data;
-      fill_data.insert(fill_data.begin(), remaining_size, 0);
-      OS.write(fill_data.data(), remaining_size);
+      // For now I fill with 0xDEADBEEF because it is easy to spot on a hex
+      // viewer.
+      std::vector<uint32_t> FillData;
+      FillData.insert(FillData.begin(), BytesRemaining / 4 + 1, 0xDEADBEEFu);
+      OS.write(reinterpret_cast<char *>(FillData.data()), BytesRemaining);
     }
   }
   return Error::success();