Reland "[HLSL][RootSignature] Implement serialization of RootConstants and RootFlags" (#143019)

This relands #141130.

The initial commit uncovered that we are missing the correct linking of
FrontendHLSL into clang/lib/Parse and clang/lib/unittests/Parse.

This change addreses this by linking them accordingly.

It was also checked and ensured that the LexHLSLRootSignature libraries
do not depend on FrontendHLSL and so we are not required to link there.

Resolves: #138190 and #138192

clang/lib/Parse/CMakeLists.txt

@@ -1,4 +1,5 @@
 set(LLVM_LINK_COMPONENTS
+  FrontendHLSL
   FrontendOpenMP
   MC
   MCParser

clang/unittests/Parse/CMakeLists.txt

@@ -11,5 +11,6 @@ add_clang_unittest(ParseTests
   LLVMTestingSupport
   clangTesting
   LLVM_COMPONENTS
+  FrontendHLSL
   Support
   )

llvm/include/llvm/Frontend/HLSL/HLSLRootSignatureUtils.h

@@ -27,6 +27,11 @@ class Metadata;
 namespace hlsl {
 namespace rootsig {
 
+LLVM_ABI raw_ostream &operator<<(raw_ostream &OS, const RootFlags &Flags);
+
+LLVM_ABI raw_ostream &operator<<(raw_ostream &OS,
+                                 const RootConstants &Constants);
+
 LLVM_ABI raw_ostream &operator<<(raw_ostream &OS,
                                  const DescriptorTableClause &Clause);
 

llvm/lib/Frontend/HLSL/HLSLRootSignatureUtils.cpp

@@ -129,6 +129,39 @@ static raw_ostream &operator<<(raw_ostream &OS,
   return OS;
 }
 
+static const EnumEntry<RootFlags> RootFlagNames[] = {
+    {"AllowInputAssemblerInputLayout",
+     RootFlags::AllowInputAssemblerInputLayout},
+    {"DenyVertexShaderRootAccess", RootFlags::DenyVertexShaderRootAccess},
+    {"DenyHullShaderRootAccess", RootFlags::DenyHullShaderRootAccess},
+    {"DenyDomainShaderRootAccess", RootFlags::DenyDomainShaderRootAccess},
+    {"DenyGeometryShaderRootAccess", RootFlags::DenyGeometryShaderRootAccess},
+    {"DenyPixelShaderRootAccess", RootFlags::DenyPixelShaderRootAccess},
+    {"AllowStreamOutput", RootFlags::AllowStreamOutput},
+    {"LocalRootSignature", RootFlags::LocalRootSignature},
+    {"DenyAmplificationShaderRootAccess",
+     RootFlags::DenyAmplificationShaderRootAccess},
+    {"DenyMeshShaderRootAccess", RootFlags::DenyMeshShaderRootAccess},
+    {"CBVSRVUAVHeapDirectlyIndexed", RootFlags::CBVSRVUAVHeapDirectlyIndexed},
+    {"SamplerHeapDirectlyIndexed", RootFlags::SamplerHeapDirectlyIndexed},
+};
+
+raw_ostream &operator<<(raw_ostream &OS, const RootFlags &Flags) {
+  OS << "RootFlags(";
+  printFlags(OS, Flags, ArrayRef(RootFlagNames));
+  OS << ")";
+
+  return OS;
+}
+
+raw_ostream &operator<<(raw_ostream &OS, const RootConstants &Constants) {
+  OS << "RootConstants(num32BitConstants = " << Constants.Num32BitConstants
+     << ", " << Constants.Reg << ", space = " << Constants.Space
+     << ", visibility = " << Constants.Visibility << ")";
+
+  return OS;
+}
+
 raw_ostream &operator<<(raw_ostream &OS, const DescriptorTable &Table) {
   OS << "DescriptorTable(numClauses = " << Table.NumClauses
      << ", visibility = " << Table.Visibility << ")";

llvm/unittests/Frontend/HLSLRootSignatureDumpTest.cpp

@@ -108,4 +108,73 @@ TEST(HLSLRootSignatureTest, DescriptorTableDump) {
   EXPECT_EQ(Out, Expected);
 }
 
+TEST(HLSLRootSignatureTest, DefaultRootConstantsDump) {
+  RootConstants Constants;
+  Constants.Num32BitConstants = 1;
+  Constants.Reg = {RegisterType::BReg, 3};
+
+  std::string Out;
+  llvm::raw_string_ostream OS(Out);
+  OS << Constants;
+  OS.flush();
+
+  std::string Expected = "RootConstants(num32BitConstants = 1, b3, space = 0, "
+                         "visibility = All)";
+  EXPECT_EQ(Out, Expected);
+}
+
+TEST(HLSLRootSignatureTest, SetRootConstantsDump) {
+  RootConstants Constants;
+  Constants.Num32BitConstants = 983;
+  Constants.Reg = {RegisterType::BReg, 34593};
+  Constants.Space = 7;
+  Constants.Visibility = ShaderVisibility::Pixel;
+
+  std::string Out;
+  llvm::raw_string_ostream OS(Out);
+  OS << Constants;
+  OS.flush();
+
+  std::string Expected = "RootConstants(num32BitConstants = 983, b34593, "
+                         "space = 7, visibility = Pixel)";
+  EXPECT_EQ(Out, Expected);
+}
+
+TEST(HLSLRootSignatureTest, NoneRootFlagsDump) {
+  RootFlags Flags = RootFlags::None;
+
+  std::string Out;
+  llvm::raw_string_ostream OS(Out);
+  OS << Flags;
+  OS.flush();
+
+  std::string Expected = "RootFlags(None)";
+  EXPECT_EQ(Out, Expected);
+}
+
+TEST(HLSLRootSignatureTest, AllRootFlagsDump) {
+  RootFlags Flags = RootFlags::ValidFlags;
+
+  std::string Out;
+  llvm::raw_string_ostream OS(Out);
+  OS << Flags;
+  OS.flush();
+
+  std::string Expected = "RootFlags("
+                         "AllowInputAssemblerInputLayout | "
+                         "DenyVertexShaderRootAccess | "
+                         "DenyHullShaderRootAccess | "
+                         "DenyDomainShaderRootAccess | "
+                         "DenyGeometryShaderRootAccess | "
+                         "DenyPixelShaderRootAccess | "
+                         "AllowStreamOutput | "
+                         "LocalRootSignature | "
+                         "DenyAmplificationShaderRootAccess | "
+                         "DenyMeshShaderRootAccess | "
+                         "CBVSRVUAVHeapDirectlyIndexed | "
+                         "SamplerHeapDirectlyIndexed)";
+
+  EXPECT_EQ(Out, Expected);
+}
+
 } // namespace