adding test to check flags

Author: joaosaffran

llvm/include/llvm/Frontend/HLSL/RootSignatureValidations.h

@@ -33,8 +33,7 @@ LLVM_ABI bool verifyRangeType(uint32_t Type);
 LLVM_ABI bool verifyDescriptorRangeFlag(uint32_t Version,
                                         dxil::ResourceClass Type,
                                         dxbc::DescriptorRangeFlags FlagsVal);
-LLVM_ABI bool verifyStaticSamplerFlags(uint32_t Version,
-                                       dxbc::StaticSamplerFlags Flags);
+LLVM_ABI bool verifyStaticSamplerFlags(uint32_t Version, uint32_t FlagsNumber);
 LLVM_ABI bool verifyNumDescriptors(uint32_t NumDescriptors);
 LLVM_ABI bool verifyMipLODBias(float MipLODBias);
 LLVM_ABI bool verifyMaxAnisotropy(uint32_t MaxAnisotropy);

llvm/lib/Frontend/HLSL/RootSignatureMetadata.cpp

@@ -663,8 +663,7 @@ Error MetadataParser::validateRootSignature(
                      make_error<RootSignatureValidationError<uint32_t>>(
                          "RegisterSpace", Sampler.RegisterSpace));
 
-    if (!hlsl::rootsig::verifyStaticSamplerFlags(
-            RSD.Version, dxbc::StaticSamplerFlags(Sampler.Flags)))
+    if (!hlsl::rootsig::verifyStaticSamplerFlags(RSD.Version, Sampler.Flags))
       DeferredErrs =
           joinErrors(std::move(DeferredErrs),
                      make_error<RootSignatureValidationError<uint32_t>>(

llvm/lib/Frontend/HLSL/RootSignatureValidations.cpp

@@ -113,9 +113,13 @@ bool verifyDescriptorRangeFlag(uint32_t Version, dxil::ResourceClass Type,
   return (Flags & ~Mask) == FlagT::None;
 }
 
-bool verifyStaticSamplerFlags(uint32_t Version,
-                              dxbc::StaticSamplerFlags Flags) {
+bool verifyStaticSamplerFlags(uint32_t Version, uint32_t FlagsNumber) {
+  uint32_t LargestValue = llvm::to_underlying(
+      dxbc::StaticSamplerFlags::LLVM_BITMASK_LARGEST_ENUMERATOR);
+  if (FlagsNumber >= NextPowerOf2(LargestValue))
+    return false;
 
+  dxbc::StaticSamplerFlags Flags = dxbc::StaticSamplerFlags(FlagsNumber);
   if (Version <= 2)
     return Flags == dxbc::StaticSamplerFlags::None;
 

llvm/test/CodeGen/DirectX/ContainerData/RootSignature-StaticSamplers-Invalid-Flag.ll

@@ -3,7 +3,7 @@
 
 target triple = "dxil-unknown-shadermodel6.0-compute"
 
-; CHECK: error: Invalid value for ShaderVisibility: 666
+; CHECK: error: Invalid value for Static Sampler Flag: 4 
 ; CHECK-NOT: Root Signature Definitions
 
 define void @main() #0 {
@@ -14,6 +14,6 @@ attributes #0 = { "hlsl.numthreads"="1,1,1" "hlsl.shader"="compute" }
 
 
 !dx.rootsignatures = !{!2} ; list of function/root signature pairs
-!2 = !{ ptr @main, !3, i32 2 } ; function, root signature
+!2 = !{ ptr @main, !3, i32 3 } ; function, root signature
 !3 = !{ !5 } ; list of root signature elements
-!5 = !{ !"StaticSampler", i32 4, i32 2, i32 3, i32 5, float 0x3FF6CCCCC0000000, i32 9, i32 3, i32 2, float -1.280000e+02, float 1.280000e+02, i32 42, i32 0, i32 666 }
+!5 = !{ !"StaticSampler", i32 4, i32 2, i32 3, i32 5, float 0x3FF6CCCCC0000000, i32 9, i32 3, i32 2, float -1.280000e+02, float 1.280000e+02, i32 42, i32 0, i32 0, i32 4 }