[lld] [LLD][COFF] Add support for CHPE code ranges metadata. (PR #105741)

[Martin Storsjö via llvm-commits]

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@@ -1078,6 +1078,22 @@ void ECExportThunkChunk::writeTo(uint8_t *buf) const {
   write32le(buf + 10, target->getRVA() - rva - 14);
 }
 
+size_t CHPECodeRangesChunk::getSize() const {
+  return exportThunks.size() * sizeof(chpe_code_range_entry);
+}
+
+void CHPECodeRangesChunk::writeTo(uint8_t *buf) const {
+  auto ranges = reinterpret_cast<chpe_code_range_entry *>(buf);
+
+  for (uint32_t i = 0; i < exportThunks.size(); i++) {
+    Chunk *thunk = exportThunks[i].first;
+    uint32_t start = thunk->getRVA();
+    ranges[i].StartRva = start;
+    ranges[i].EndRva = start + thunk->getSize();
+    ranges[i].EntryPoint = start;
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mstorsjo wrote:

So this is a similar list as #105739, with the same start RVAs, but containing the size and not the destination? And the `EntryPoint` value seems pointless at this point, I presume it will seem more useful after some more future patches.

(I.e. I'm not questioning this patch, I'm questioning the usefulness of this data structure - but I guess it makes more sense when more complete.)

https://github.com/llvm/llvm-project/pull/105741