[HLSL] Update DXIL resource metadata code to support resource arrays (#152254)

Closes #145422

Author: hekota

llvm/lib/Analysis/DXILResource.cpp

@@ -612,7 +612,12 @@ void ResourceTypeInfo::print(raw_ostream &OS, const DataLayout &DL) const {
 
 GlobalVariable *ResourceInfo::createSymbol(Module &M, StructType *Ty) {
   assert(!Symbol && "Symbol has already been created");
-  Symbol = new GlobalVariable(M, Ty, /*isConstant=*/true,
+  Type *ResTy = Ty;
+  int64_t Size = Binding.Size;
+  if (Size != 1)
+    // unbounded arrays are represented as zero-sized arrays in LLVM IR
+    ResTy = ArrayType::get(Ty, Size == ~0u ? 0 : Size);
+  Symbol = new GlobalVariable(M, ResTy, /*isConstant=*/true,
                               GlobalValue::ExternalLinkage,
                               /*Initializer=*/nullptr, Name);
   return Symbol;

llvm/test/CodeGen/DirectX/Metadata/srv_metadata.ll

@@ -105,8 +105,8 @@ attributes #0 = { noinline nounwind "hlsl.shader"="compute" }
 ; CHECK: @Four = external constant %ByteAddressBuffer
 ; CHECK: @Five = external constant %"StructuredBuffer<int16_t>"
 ; CHECK: @Six = external constant %"Buffer<uint32_t>"
-; CHECK: @Array = external constant %"Buffer<float4>"
-; CHECK: @Array2 = external constant %"Buffer<double>"
+; CHECK: @Array = external constant [100 x %"Buffer<float4>"]
+; CHECK: @Array2 = external constant [0 x %"Buffer<double>"]
 ; CHECK: @Seven = external constant %"Buffer<uint32_t>"
 
 ; CHECK: !dx.resources = !{[[ResList:[!][0-9]+]]}

llvm/test/CodeGen/DirectX/Metadata/uav_metadata.ll

@@ -128,8 +128,8 @@ attributes #0 = { noinline nounwind "hlsl.shader"="compute" }
 ; CHECK: @Seven = external constant %"RasterizerOrderedStructuredBuffer<int32_t4>"
 ; CHECK: @Eight = external constant %RasterizerOrderedByteAddressBuffer
 ; CHECK: @Nine = external constant %"RWBuffer<uint32_t>"
-; CHECK: @Array = external constant %"RWBuffer<float4>"
-; CHECK: @Array2 = external constant %"RWBuffer<double>"
+; CHECK: @Array = external constant [100 x %"RWBuffer<float4>"]
+; CHECK: @Array2 = external constant [0 x %"RWBuffer<double>"]
 ; CHECK: @Ten = external constant %"RWBuffer<uint32_t>"
 
 ; CHECK: !dx.resources = !{[[ResList:[!][0-9]+]]}