================
@@ -12,44 +12,59 @@
using namespace llvm;
using namespace llvm::mcdxbc;
+void setRewrite(raw_ostream &Stream, uint32_t &Offset) {
+ const uint32_t DummyValue = std::numeric_limits<uint32_t>::max();
+ Offset = Stream.tell();
+ support::endian::write(Stream, DummyValue, llvm::endianness::little);
+}
+
+void rewriteOffset(buffer_ostream &Stream, uint32_t Offset) {
+ uint32_t Value = Stream.tell();
+ auto *InsertPoint = &Stream.buffer()[Offset];
+ support::endian::write(InsertPoint, Value, llvm::endianness::little);
+}
+
void RootSignatureDesc::write(raw_ostream &OS) const {
- // Root signature header in dxcontainer has 6 uint_32t values.
- const uint32_t HeaderSize = 24;
- const uint32_t ParameterByteSize = Parameters.size_in_bytes();
- const uint32_t NumParametes = Parameters.size();
+ buffer_ostream Writer(OS);
+ const uint32_t NumParameters = Parameters.size();
const uint32_t Zero = 0;
- // Writing header information
- support::endian::write(OS, Header.Version, llvm::endianness::little);
- support::endian::write(OS, NumParametes, llvm::endianness::little);
- support::endian::write(OS, HeaderSize, llvm::endianness::little);
+ support::endian::write(Writer, Header.Version, llvm::endianness::little);
+ support::endian::write(Writer, NumParameters, llvm::endianness::little);
- // Static samplers still not implemented
- support::endian::write(OS, Zero, llvm::endianness::little);
- support::endian::write(OS, ParameterByteSize + HeaderSize,
- llvm::endianness::little);
+ uint32_t HeaderPoint;
+ setRewrite(Writer, HeaderPoint);
- support::endian::write(OS, Header.Flags, llvm::endianness::little);
+ support::endian::write(Writer, Zero, llvm::endianness::little);
+ support::endian::write(Writer, Zero, llvm::endianness::little);
+ support::endian::write(Writer, Header.Flags, llvm::endianness::little);
- uint32_t ParamsOffset =
- HeaderSize + (3 * sizeof(uint32_t) * Parameters.size());
- for (const dxbc::RootParameter &P : Parameters) {
- support::endian::write(OS, P.ParameterType, llvm::endianness::little);
- support::endian::write(OS, P.ShaderVisibility, llvm::endianness::little);
- support::endian::write(OS, ParamsOffset, llvm::endianness::little);
+ rewriteOffset(Writer, HeaderPoint);
- // Size of root parameter, removing the ParameterType and ShaderVisibility.
- ParamsOffset += sizeof(dxbc::RootParameter) - 2 * sizeof(uint32_t);
+ SmallVector<uint32_t> ParamsOffset;
+ for (const auto &P : Parameters) {
+ support::endian::write(Writer, P.ParameterType, llvm::endianness::little);
+ support::endian::write(Writer, P.ShaderVisibility,
+ llvm::endianness::little);
+
+ uint32_t Offset;
+ setRewrite(Writer, Offset);
+
+ ParamsOffset.push_back(Offset);
----------------
damyanp wrote:
Take this or leave it, but I think this can be made a little nicer:
```suggestion
ParamsOffset.push_back(writePlaceholder(Writer));
```
https://github.com/llvm/llvm-project/pull/128577
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