[llvm] [DirectX] adding support to read/write descriptor table data using obj2yaml/yaml2obj (PR #138315)

[Chris B via llvm-commits]

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@@ -228,6 +273,19 @@ class RootSignature {
       else
         DataSize = sizeof(dxbc::RTS0::v2::RootDescriptor);
       break;
+    case dxbc::RootParameterType::DescriptorTable:
+      uint32_t NumRanges =
+          support::endian::read<uint32_t, llvm::endianness::little>(
+              PartData.begin() + Header.ParameterOffset);
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llvm-beanz wrote:

The DXContainer reader really needs to be hardened against crashing since this code may be used in drivers and/or runtime libraries.

We should at least validate that the offset is within the part's range and error appropriately.

https://github.com/llvm/llvm-project/pull/138315