[llvm] [Archive][COFF] Split hybrid COFF files when adding them to an archive (PR #205160)

[Martin Storsjö via llvm-commits]

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@@ -1580,6 +1580,69 @@ std::optional<MemoryBufferRef> COFFObjectFile::findHybridObjectSection() const {
   return std::nullopt;
 }
 
+std::unique_ptr<MemoryBuffer> COFFObjectFile::stripHybridSection() const {
+  if (getDOSHeader() || getMachine() != COFF::IMAGE_FILE_MACHINE_ARM64)
+    return nullptr;
+
+  for (SectionRef S : sections()) {
+    Expected<StringRef> Name = S.getName();
+    if (errorToBool(Name.takeError()) || *Name != kArm64XSectionName)
+      continue;
+
+    const coff_section *HybridSec = getCOFFSection(S);
+    if (!HybridSec->SizeOfRawData)
+      continue;
+
+    // Copy the original buffer, skipping the hybrid section content.
+    std::unique_ptr<WritableMemoryBuffer> HybridView =
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mstorsjo wrote:

`HybridView` doesn't seem like the right name here - as we're aiming for the opposite, a non-hybrid view with only the main architecture?

https://github.com/llvm/llvm-project/pull/205160