Add Preview Hashing sentinel value to dxil validator

[bob80905]

When the dxil validator detects that the target shader model is a preview shader model that hasn't officially been released, it should sign the dxil container with a special sentinel hash: 02020202020202020202020202020202

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You can test this locally with the following command:

darker --check --diff -r 070d0d5a2beacef9eeb51037a9b04665716fd6f3..a55b66722f8a6359a9244d5a52df5635fc6834d4 utils/hct/hctdb_instrhelp.py

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--- hctdb_instrhelp.py	2025-01-09 03:03:18.000000 +0000
+++ hctdb_instrhelp.py	2025-01-09 03:07:38.185354 +0000
@@ -1557,10 +1557,11 @@
         highest_major,
         highest_minor,
     )
     return result
 
+
 def get_prerelease_shader_model():
     result = """static const unsigned kPreReleaseMajor = %d;
 static const unsigned kPreReleaseMinor = %d;""" % (
         prerelease_major,
         prerelease_minor,

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⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff 070d0d5a2beacef9eeb51037a9b04665716fd6f3 a55b66722f8a6359a9244d5a52df5635fc6834d4 -- include/dxc/DXIL/DxilConstants.h include/dxc/DXIL/DxilShaderModel.h lib/DXIL/DxilMetadataHelper.cpp lib/DXIL/DxilShaderModel.cpp tools/clang/tools/dxcompiler/dxcassembler.cpp tools/clang/tools/dxcvalidator/dxcvalidator.cpp

View the diff from clang-format here.

diff --git a/tools/clang/tools/dxcompiler/dxcassembler.cpp b/tools/clang/tools/dxcompiler/dxcassembler.cpp
index d7972a01..6764a22a 100644
--- a/tools/clang/tools/dxcompiler/dxcassembler.cpp
+++ b/tools/clang/tools/dxcompiler/dxcassembler.cpp
@@ -67,8 +67,10 @@ public:
 
 // Assemble dxil in ll or llvm bitcode to dxbc container.
 HRESULT STDMETHODCALLTYPE DxcAssembler::AssembleToContainer(
-    IDxcBlob *pShader,             // Shader to assemble.
-    IDxcOperationResult **ppResult // Assemble output status, buffer, and errors) { // inputs used to assemble the container
+    IDxcBlob *pShader, // Shader to assemble.
+    IDxcOperationResult *
+        *ppResult // Assemble output status, buffer, and errors) { // inputs
+                  // used to assemble the container
 ) {
   if (pShader == nullptr || ppResult == nullptr)
     return E_POINTER;
diff --git a/tools/clang/tools/dxcvalidator/dxcvalidator.cpp b/tools/clang/tools/dxcvalidator/dxcvalidator.cpp
index f53a535a..e4e54c3c 100644
--- a/tools/clang/tools/dxcvalidator/dxcvalidator.cpp
+++ b/tools/clang/tools/dxcvalidator/dxcvalidator.cpp
@@ -20,12 +20,11 @@
 #include "dxc/dxcapi.h"
 #include "dxcvalidator.h"
 
+#include "dxc/DXIL/DxilShaderModel.h"
 #include "dxc/DxilRootSignature/DxilRootSignature.h"
 #include "dxc/Support/FileIOHelper.h"
 #include "dxc/Support/Global.h"
 #include "dxc/Support/dxcapi.impl.h"
-#include "dxc/DXIL/DxilShaderModel.h"
-
 
 #ifdef _WIN32
 #include "dxcetw.h"
@@ -49,12 +48,10 @@ static void HashAndUpdate(DxilContainerHeader *Container, bool isPreRelease) {
       (const unsigned char *)Container + DXBCHashStartOffset;
   unsigned AmountToHash = Container->ContainerSizeInBytes - DXBCHashStartOffset;
   ComputeHashRetail(DataToHash, AmountToHash, Container->Hash.Digest);
-  
 }
 
 static void HashAndUpdateOrCopy(uint32_t Flags, IDxcBlob *Shader,
-                                IDxcBlob **Hashed,
-                                llvm::Module *DebugModule) {
+                                IDxcBlob **Hashed, llvm::Module *DebugModule) {
   bool isPreRelease = false;
   const DxilContainerHeader *DxilContainer =
       IsDxilContainerLike(Shader->GetBufferPointer(), Shader->GetBufferSize());
@@ -72,7 +69,8 @@ static void HashAndUpdateOrCopy(uint32_t Flags, IDxcBlob *Shader,
   }
 
   if (Flags & DxcValidatorFlags_InPlaceEdit) {
-    HashAndUpdate((DxilContainerHeader *)Shader->GetBufferPointer(), isPreRelease);
+    HashAndUpdate((DxilContainerHeader *)Shader->GetBufferPointer(),
+                  isPreRelease);
     *Hashed = Shader;
     Shader->AddRef();
   } else {
@@ -81,7 +79,8 @@ static void HashAndUpdateOrCopy(uint32_t Flags, IDxcBlob *Shader,
     unsigned long CB;
     IFT(HashedBlobStream->Write(Shader->GetBufferPointer(),
                                 Shader->GetBufferSize(), &CB));
-    HashAndUpdate((DxilContainerHeader *)HashedBlobStream->GetPtr(), isPreRelease);
+    HashAndUpdate((DxilContainerHeader *)HashedBlobStream->GetPtr(),
+                  isPreRelease);
     IFT(HashedBlobStream.QueryInterface(Hashed));
   }
 }

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