[PATCH] D136913: [HLSL] support RWByteAddressBuffer.

[Xiang Li via Phabricator via cfe-commits]

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Only RWByteAddressBuffer::Load is supported in this PR.
Implement Load by cast handle to uint8_t ptr first.
Then add the byte address to get target address.
Cast the target address to target type ptr and deref.

struct RWByteAddressBuffer {

  void *handle;
  template<typename T> Load(uint i) {
     return *((T*)(((uint8_t*)handle) + i));
  }

};

Allow ref/ptr use for HLSLExternalSemaSource to skip the check when Location is invalid.

Also add HLSLResourceHelper to share code for RWByteAddressBuffer and RWBuffer.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D136913

Files:
  clang/include/clang/Sema/HLSLExternalSemaSource.h
  clang/lib/Sema/HLSLExternalSemaSource.cpp
  clang/lib/Sema/SemaExpr.cpp
  clang/lib/Sema/SemaExprMember.cpp
  clang/test/AST/HLSL/RWByteAddressBuffer.hlsl
  clang/test/SemaHLSL/BuiltIns/RWByteAddressBuffer.hlsl

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