Author: Finn Plummer
Date: 2025-07-04T09:48:24-07:00
New Revision: 6a948145aa7a55af31e7406842a4f45a86b74eaf

URL: 
https://github.com/llvm/llvm-project/commit/6a948145aa7a55af31e7406842a4f45a86b74eaf
DIFF: 
https://github.com/llvm/llvm-project/commit/6a948145aa7a55af31e7406842a4f45a86b74eaf.diff

LOG: [HLSL][RootSignature] Update `setDefaultFlags` to account for Root 
Signature Version (#145828)

This pr updates `setDefaultFlags` in `HLSLRootSignature.h` to account
for which version it should initialize the default flag values for.

- Updates `setDefaultFlags` with a `Version` argument and initializes
them to be compliant as described
[here](https://github.com/llvm/wg-hlsl/pull/297).
- Updates `RootSignatureParser` to retain the `Version` and pass this
into `setDefaultFlags`
- Updates all uses of `setDefaultFlags` in test-cases
- Adds some new unit testing to ensure behaviour is as expected and that
the Parser correctly passes down the version

Resolves https://github.com/llvm/llvm-project/issues/145820.

Added: 
    

Modified: 
    clang/include/clang/Parse/ParseHLSLRootSignature.h
    clang/lib/Parse/ParseDeclCXX.cpp
    clang/lib/Parse/ParseHLSLRootSignature.cpp
    clang/test/AST/HLSL/RootSignatures-AST.hlsl
    clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp
    llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
    llvm/unittests/Frontend/HLSLRootSignatureDumpTest.cpp

Removed: 
    


################################################################################
diff  --git a/clang/include/clang/Parse/ParseHLSLRootSignature.h 
b/clang/include/clang/Parse/ParseHLSLRootSignature.h
index 18cd1f379e62c..66a5a3b7eaad0 100644
--- a/clang/include/clang/Parse/ParseHLSLRootSignature.h
+++ b/clang/include/clang/Parse/ParseHLSLRootSignature.h
@@ -27,7 +27,8 @@ namespace hlsl {
 
 class RootSignatureParser {
 public:
-  RootSignatureParser(SmallVector<llvm::hlsl::rootsig::RootElement> &Elements,
+  RootSignatureParser(llvm::dxbc::RootSignatureVersion Version,
+                      SmallVector<llvm::hlsl::rootsig::RootElement> &Elements,
                       RootSignatureLexer &Lexer, clang::Preprocessor &PP);
 
   /// Consumes tokens from the Lexer and constructs the in-memory
@@ -187,6 +188,7 @@ class RootSignatureParser {
   bool tryConsumeExpectedToken(ArrayRef<RootSignatureToken::Kind> Expected);
 
 private:
+  llvm::dxbc::RootSignatureVersion Version;
   SmallVector<llvm::hlsl::rootsig::RootElement> &Elements;
   RootSignatureLexer &Lexer;
 

diff  --git a/clang/lib/Parse/ParseDeclCXX.cpp 
b/clang/lib/Parse/ParseDeclCXX.cpp
index bd5c28b1992c4..6b0564dca6f45 100644
--- a/clang/lib/Parse/ParseDeclCXX.cpp
+++ b/clang/lib/Parse/ParseDeclCXX.cpp
@@ -4956,7 +4956,8 @@ void 
Parser::ParseHLSLRootSignatureAttributeArgs(ParsedAttributes &Attrs) {
     // Invoke the root signature parser to construct the in-memory constructs
     hlsl::RootSignatureLexer Lexer(Signature, SignatureLoc);
     SmallVector<llvm::hlsl::rootsig::RootElement> RootElements;
-    hlsl::RootSignatureParser Parser(RootElements, Lexer, PP);
+    hlsl::RootSignatureParser Parser(getLangOpts().HLSLRootSigVer, 
RootElements,
+                                     Lexer, PP);
     if (Parser.parse()) {
       T.consumeClose();
       return;

diff  --git a/clang/lib/Parse/ParseHLSLRootSignature.cpp 
b/clang/lib/Parse/ParseHLSLRootSignature.cpp
index 18d3644114eef..96d3999ff2acb 100644
--- a/clang/lib/Parse/ParseHLSLRootSignature.cpp
+++ b/clang/lib/Parse/ParseHLSLRootSignature.cpp
@@ -17,10 +17,12 @@ namespace hlsl {
 
 using TokenKind = RootSignatureToken::Kind;
 
-RootSignatureParser::RootSignatureParser(SmallVector<RootElement> &Elements,
-                                         RootSignatureLexer &Lexer,
-                                         Preprocessor &PP)
-    : Elements(Elements), Lexer(Lexer), PP(PP), CurToken(SourceLocation()) {}
+RootSignatureParser::RootSignatureParser(
+    llvm::dxbc::RootSignatureVersion Version,
+    SmallVector<RootElement> &Elements, RootSignatureLexer &Lexer,
+    Preprocessor &PP)
+    : Version(Version), Elements(Elements), Lexer(Lexer), PP(PP),
+      CurToken(SourceLocation()) {}
 
 bool RootSignatureParser::parse() {
   // Iterate as many RootElements as possible
@@ -199,7 +201,7 @@ std::optional<RootDescriptor> 
RootSignatureParser::parseRootDescriptor() {
     ExpectedReg = TokenKind::uReg;
     break;
   }
-  Descriptor.setDefaultFlags();
+  Descriptor.setDefaultFlags(Version);
 
   auto Params = parseRootDescriptorParams(ExpectedReg);
   if (!Params.has_value())
@@ -318,7 +320,7 @@ RootSignatureParser::parseDescriptorTableClause() {
     ExpectedReg = TokenKind::sReg;
     break;
   }
-  Clause.setDefaultFlags();
+  Clause.setDefaultFlags(Version);
 
   auto Params = parseDescriptorTableClauseParams(ExpectedReg);
   if (!Params.has_value())

diff  --git a/clang/test/AST/HLSL/RootSignatures-AST.hlsl 
b/clang/test/AST/HLSL/RootSignatures-AST.hlsl
index 1e60b9367c145..27c40430c9d0a 100644
--- a/clang/test/AST/HLSL/RootSignatures-AST.hlsl
+++ b/clang/test/AST/HLSL/RootSignatures-AST.hlsl
@@ -1,11 +1,11 @@
 // RUN: %clang_cc1 -triple dxil-pc-shadermodel6.0-library -ast-dump \
-// RUN:  -disable-llvm-passes -o - %s | FileCheck %s
+// RUN:  -disable-llvm-passes -o - %s | FileCheck %s 
--check-prefixes=CHECK,CHECK-V1_1
 // RUN: %clang_cc1 -triple dxil-pc-shadermodel6.0-library -ast-dump \
 // RUN:  -fdx-rootsignature-version=rootsig_1_0 \
-// RUN:  -disable-llvm-passes -o - %s | FileCheck %s --check-prefix=CHECK-V1_0
+// RUN:  -disable-llvm-passes -o - %s | FileCheck %s 
--check-prefixes=CHECK,CHECK-V1_0
 // RUN: %clang_cc1 -triple dxil-pc-shadermodel6.0-library -ast-dump \
 // RUN:  -fdx-rootsignature-version=rootsig_1_1 \
-// RUN:  -disable-llvm-passes -o - %s | FileCheck %s --check-prefix=CHECK-V1_1
+// RUN:  -disable-llvm-passes -o - %s | FileCheck %s 
--check-prefixes=CHECK,CHECK-V1_1
 
 // This test ensures that the sample root signature is parsed without error and
 // the Attr AST Node is created succesfully. If an invalid root signature was
@@ -37,13 +37,17 @@
 // CHECK-SAME:   space = 1, visibility = All, flags = DataStatic
 // CHECK-SAME: ),
 // CHECK-SAME: RootSRV(t0,
-// CHECK-SAME:   space = 0, visibility = All, flags = 
DataStaticWhileSetAtExecute
+// CHECK-SAME:   space = 0, visibility = All,
+// CHECK-V1_0-SAME: flags = DataVolatile
+// CHECK-V1_1-SAME: flags = DataStaticWhileSetAtExecute
 // CHECK-SAME: ),
 // CHECK-SAME: RootUAV(
 // CHECK-SAME:   u0, space = 0, visibility = All, flags = DataVolatile
 // CHECK-SAME: ),
 // CHECK-SAME: CBV(
-// CHECK-SAME:   b1, numDescriptors = 1, space = 0, offset = 
DescriptorTableOffsetAppend, flags = DataStaticWhileSetAtExecute
+// CHECK-SAME:   b1, numDescriptors = 1, space = 0, offset = 
DescriptorTableOffsetAppend,
+// CHECK-V1_0-SAME: flags = DescriptorsVolatile | DataVolatile
+// CHECK-V1_1-SAME: flags = DataStaticWhileSetAtExecute
 // CHECK-SAME: ),
 // CHECK-SAME: SRV(
 // CHECK-SAME:   t1, numDescriptors = 8, space = 0, offset = 
DescriptorTableOffsetAppend, flags = DescriptorsVolatile
@@ -55,7 +59,9 @@
 // CHECK-SAME:   numClauses = 3, visibility = All
 // CHECK-SAME: ),
 // CHECK-SAME: Sampler(
-// CHECK-SAME:   s0, numDescriptors = 4, space = 1, offset = 
DescriptorTableOffsetAppend, flags = None
+// CHECK-SAME:   s0, numDescriptors = 4, space = 1, offset = 
DescriptorTableOffsetAppend,
+// CHECK-V1_0-SAME:  flags = DescriptorsVolatile
+// CHECK-V1_1-SAME:  flags = None
 // CHECK-SAME: ),
 // CHECK-SAME: DescriptorTable(
 // CHECK-SAME:   numClauses = 1, visibility = All
@@ -112,9 +118,13 @@ void same_rs_string_main() {}
 // a seperate decl and identifier to reference
 
 // CHECK: -HLSLRootSignatureDecl 0x{{.*}} {{.*}} implicit 
[[DIFF_RS_DECL:__hlsl_rootsig_decl_\d*]]
+// CHECK-V1_0: version: 1.0,
+// CHECK-V1_1: version: 1.1,
 // CHECK-SAME: RootElements{
-// CHECK-SAME:   Sampler(s0, numDescriptors = 4, space = 1,
-// CHECK-SAME:     offset = DescriptorTableOffsetAppend, flags = None),
+// CHECK-SAME:   Sampler(s0, numDescriptors = 4, space = 1, offset = 
DescriptorTableOffsetAppend,
+// CHECK-V1_0-SAME:  flags = DescriptorsVolatile
+// CHECK-V1_1-SAME:  flags = None
+// CHECK-SAME: ),
 // CHECK-SAME:   DescriptorTable(numClauses = 1, visibility = All)
 // CHECK-SAME: }
 

diff  --git a/clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp 
b/clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp
index 8831198e4b9c2..871f12ef3cce3 100644
--- a/clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp
+++ b/clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp
@@ -29,6 +29,8 @@ using namespace llvm::hlsl::rootsig;
 
 namespace {
 
+using llvm::dxbc::RootSignatureVersion;
+
 // Diagnostic helper for helper tests
 class ExpectedDiagConsumer : public DiagnosticConsumer {
   virtual void anchor() {}
@@ -115,7 +117,8 @@ TEST_F(ParseHLSLRootSignatureTest, ValidParseEmptyTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test no diagnostics produced
   Consumer->setNoDiag();
@@ -149,7 +152,8 @@ TEST_F(ParseHLSLRootSignatureTest, ValidParseDTClausesTest) 
{
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test no diagnostics produced
   Consumer->setNoDiag();
@@ -252,7 +256,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
ValidParseStaticSamplerTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test no diagnostics produced
   Consumer->setNoDiag();
@@ -337,7 +342,8 @@ TEST_F(ParseHLSLRootSignatureTest, ValidParseFloatsTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test no diagnostics produced
   Consumer->setNoDiag();
@@ -412,7 +418,8 @@ TEST_F(ParseHLSLRootSignatureTest, ValidSamplerFlagsTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test no diagnostics produced
   Consumer->setNoDiag();
@@ -443,7 +450,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
ValidParseRootConsantsTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test no diagnostics produced
   Consumer->setNoDiag();
@@ -500,7 +508,8 @@ TEST_F(ParseHLSLRootSignatureTest, ValidParseRootFlagsTest) 
{
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test no diagnostics produced
   Consumer->setNoDiag();
@@ -553,7 +562,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
ValidParseRootDescriptorsTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test no diagnostics produced
   Consumer->setNoDiag();
@@ -627,7 +637,8 @@ TEST_F(ParseHLSLRootSignatureTest, ValidTrailingCommaTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test no diagnostics produced
   Consumer->setNoDiag();
@@ -637,6 +648,152 @@ TEST_F(ParseHLSLRootSignatureTest, 
ValidTrailingCommaTest) {
   ASSERT_TRUE(Consumer->isSatisfied());
 }
 
+TEST_F(ParseHLSLRootSignatureTest, ValidVersion10Test) {
+  // This test checks that the default values are set correctly
+  // when parsing with root signature version 1.0
+  const llvm::StringLiteral Source = R"cc(
+    CBV(b0),
+    SRV(t0),
+    UAV(u0),
+    DescriptorTable(
+      CBV(b1),
+      SRV(t1),
+      UAV(u1),
+      Sampler(s1),
+    )
+  )cc";
+
+  TrivialModuleLoader ModLoader;
+  auto PP = createPP(Source, ModLoader);
+  auto TokLoc = SourceLocation();
+
+  hlsl::RootSignatureLexer Lexer(Source, TokLoc);
+  SmallVector<RootElement> Elements;
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_0, Elements, Lexer,
+                                   *PP);
+
+  // Test no diagnostics produced
+  Consumer->setNoDiag();
+
+  ASSERT_FALSE(Parser.parse());
+
+  auto DefRootDescriptorFlag = llvm::dxbc::RootDescriptorFlags::DataVolatile;
+  RootElement Elem = Elements[0];
+  ASSERT_TRUE(std::holds_alternative<RootDescriptor>(Elem));
+  ASSERT_EQ(std::get<RootDescriptor>(Elem).Type, DescriptorType::CBuffer);
+  ASSERT_EQ(std::get<RootDescriptor>(Elem).Flags, DefRootDescriptorFlag);
+
+  Elem = Elements[1];
+  ASSERT_TRUE(std::holds_alternative<RootDescriptor>(Elem));
+  ASSERT_EQ(std::get<RootDescriptor>(Elem).Type, DescriptorType::SRV);
+  ASSERT_EQ(std::get<RootDescriptor>(Elem).Flags, DefRootDescriptorFlag);
+
+  Elem = Elements[2];
+  ASSERT_TRUE(std::holds_alternative<RootDescriptor>(Elem));
+  ASSERT_EQ(std::get<RootDescriptor>(Elem).Type, DescriptorType::UAV);
+  ASSERT_EQ(std::get<RootDescriptor>(Elem).Flags, DefRootDescriptorFlag);
+
+  auto ValidNonSamplerFlags =
+      llvm::dxbc::DescriptorRangeFlags::DescriptorsVolatile |
+      llvm::dxbc::DescriptorRangeFlags::DataVolatile;
+  Elem = Elements[3];
+  ASSERT_TRUE(std::holds_alternative<DescriptorTableClause>(Elem));
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Type, ClauseType::CBuffer);
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Flags, ValidNonSamplerFlags);
+
+  Elem = Elements[4];
+  ASSERT_TRUE(std::holds_alternative<DescriptorTableClause>(Elem));
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Type, ClauseType::SRV);
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Flags, ValidNonSamplerFlags);
+
+  Elem = Elements[5];
+  ASSERT_TRUE(std::holds_alternative<DescriptorTableClause>(Elem));
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Type, ClauseType::UAV);
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Flags, ValidNonSamplerFlags);
+
+  Elem = Elements[6];
+  ASSERT_TRUE(std::holds_alternative<DescriptorTableClause>(Elem));
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Type, ClauseType::Sampler);
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Flags,
+            llvm::dxbc::DescriptorRangeFlags::DescriptorsVolatile);
+
+  ASSERT_TRUE(Consumer->isSatisfied());
+}
+
+TEST_F(ParseHLSLRootSignatureTest, ValidVersion11Test) {
+  // This test checks that the default values are set correctly
+  // when parsing with root signature version 1.1
+  const llvm::StringLiteral Source = R"cc(
+    CBV(b0),
+    SRV(t0),
+    UAV(u0),
+    DescriptorTable(
+      CBV(b1),
+      SRV(t1),
+      UAV(u1),
+      Sampler(s1),
+    )
+  )cc";
+
+  TrivialModuleLoader ModLoader;
+  auto PP = createPP(Source, ModLoader);
+  auto TokLoc = SourceLocation();
+
+  hlsl::RootSignatureLexer Lexer(Source, TokLoc);
+  SmallVector<RootElement> Elements;
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
+
+  // Test no diagnostics produced
+  Consumer->setNoDiag();
+
+  ASSERT_FALSE(Parser.parse());
+
+  RootElement Elem = Elements[0];
+  ASSERT_TRUE(std::holds_alternative<RootDescriptor>(Elem));
+  ASSERT_EQ(std::get<RootDescriptor>(Elem).Type, DescriptorType::CBuffer);
+  ASSERT_EQ(std::get<RootDescriptor>(Elem).Flags,
+            llvm::dxbc::RootDescriptorFlags::DataStaticWhileSetAtExecute);
+
+  Elem = Elements[1];
+  ASSERT_TRUE(std::holds_alternative<RootDescriptor>(Elem));
+  ASSERT_EQ(std::get<RootDescriptor>(Elem).Type, DescriptorType::SRV);
+  ASSERT_EQ(std::get<RootDescriptor>(Elem).Flags,
+            llvm::dxbc::RootDescriptorFlags::DataStaticWhileSetAtExecute);
+
+  Elem = Elements[2];
+  ASSERT_TRUE(std::holds_alternative<RootDescriptor>(Elem));
+  ASSERT_EQ(std::get<RootDescriptor>(Elem).Type, DescriptorType::UAV);
+  ASSERT_EQ(std::get<RootDescriptor>(Elem).Flags,
+            llvm::dxbc::RootDescriptorFlags::DataVolatile);
+
+  Elem = Elements[3];
+  ASSERT_TRUE(std::holds_alternative<DescriptorTableClause>(Elem));
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Type, ClauseType::CBuffer);
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Flags,
+            llvm::dxbc::DescriptorRangeFlags::DataStaticWhileSetAtExecute);
+
+  Elem = Elements[4];
+  ASSERT_TRUE(std::holds_alternative<DescriptorTableClause>(Elem));
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Type, ClauseType::SRV);
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Flags,
+            llvm::dxbc::DescriptorRangeFlags::DataStaticWhileSetAtExecute);
+
+  Elem = Elements[5];
+  ASSERT_TRUE(std::holds_alternative<DescriptorTableClause>(Elem));
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Type, ClauseType::UAV);
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Flags,
+            llvm::dxbc::DescriptorRangeFlags::DataVolatile);
+
+  Elem = Elements[6];
+  ASSERT_TRUE(std::holds_alternative<DescriptorTableClause>(Elem));
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Type, ClauseType::Sampler);
+  ASSERT_EQ(std::get<DescriptorTableClause>(Elem).Flags,
+            llvm::dxbc::DescriptorRangeFlags::None);
+
+  ASSERT_TRUE(Consumer->isSatisfied());
+}
+
 // Invalid Parser Tests
 
 TEST_F(ParseHLSLRootSignatureTest, InvalidParseUnexpectedTokenTest) {
@@ -651,7 +808,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidParseUnexpectedTokenTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_unexpected_end_of_params);
@@ -671,7 +829,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidParseInvalidTokenTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced - invalid token
   Consumer->setExpected(diag::err_hlsl_unexpected_end_of_params);
@@ -691,7 +850,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidParseUnexpectedEndOfStreamTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced - end of stream
   Consumer->setExpected(diag::err_expected_after);
@@ -716,7 +876,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidMissingDTParameterTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_rootsig_missing_param);
@@ -738,7 +899,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidMissingRDParameterTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_rootsig_missing_param);
@@ -760,7 +922,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidMissingRCParameterTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_rootsig_missing_param);
@@ -784,7 +947,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidRepeatedMandatoryDTParameterTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_rootsig_repeat_param);
@@ -806,7 +970,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidRepeatedMandatoryRCParameterTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_rootsig_repeat_param);
@@ -830,7 +995,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidRepeatedOptionalDTParameterTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_rootsig_repeat_param);
@@ -856,7 +1022,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidRepeatedOptionalRCParameterTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_rootsig_repeat_param);
@@ -879,7 +1046,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidLexOverflowedNumberTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_number_literal_overflow);
@@ -901,7 +1069,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidParseOverflowedNegativeNumberTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_number_literal_overflow);
@@ -922,7 +1091,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidLexOverflowedFloatTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_number_literal_overflow);
@@ -943,7 +1113,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidLexNegOverflowedFloatTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_number_literal_overflow);
@@ -964,7 +1135,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidLexOverflowedDoubleTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_number_literal_overflow);
@@ -985,7 +1157,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidLexUnderflowFloatTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_number_literal_underflow);
@@ -1009,7 +1182,8 @@ TEST_F(ParseHLSLRootSignatureTest, 
InvalidNonZeroFlagsTest) {
 
   hlsl::RootSignatureLexer Lexer(Source, TokLoc);
   SmallVector<RootElement> Elements;
-  hlsl::RootSignatureParser Parser(Elements, Lexer, *PP);
+  hlsl::RootSignatureParser Parser(RootSignatureVersion::V1_1, Elements, Lexer,
+                                   *PP);
 
   // Test correct diagnostic produced
   Consumer->setExpected(diag::err_hlsl_rootsig_non_zero_flag);

diff  --git a/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h 
b/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
index e10bd81c73aad..e44612af071bc 100644
--- a/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
+++ b/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
@@ -51,7 +51,14 @@ struct RootDescriptor {
   dxbc::ShaderVisibility Visibility = dxbc::ShaderVisibility::All;
   dxbc::RootDescriptorFlags Flags;
 
-  void setDefaultFlags() {
+  void setDefaultFlags(dxbc::RootSignatureVersion Version) {
+    if (Version == dxbc::RootSignatureVersion::V1_0) {
+      Flags = dxbc::RootDescriptorFlags::DataVolatile;
+      return;
+    }
+
+    assert(Version == llvm::dxbc::RootSignatureVersion::V1_1 &&
+           "Specified an invalid root signature version");
     switch (Type) {
     case DescriptorType::CBuffer:
     case DescriptorType::SRV:
@@ -84,7 +91,16 @@ struct DescriptorTableClause {
   uint32_t Offset = DescriptorTableOffsetAppend;
   dxbc::DescriptorRangeFlags Flags;
 
-  void setDefaultFlags() {
+  void setDefaultFlags(dxbc::RootSignatureVersion Version) {
+    if (Version == dxbc::RootSignatureVersion::V1_0) {
+      Flags = dxbc::DescriptorRangeFlags::DescriptorsVolatile;
+      if (Type != ClauseType::Sampler)
+        Flags |= dxbc::DescriptorRangeFlags::DataVolatile;
+      return;
+    }
+
+    assert(Version == dxbc::RootSignatureVersion::V1_1 &&
+           "Specified an invalid root signature version");
     switch (Type) {
     case ClauseType::CBuffer:
     case ClauseType::SRV:

diff  --git a/llvm/unittests/Frontend/HLSLRootSignatureDumpTest.cpp 
b/llvm/unittests/Frontend/HLSLRootSignatureDumpTest.cpp
index 2a326353d67a4..98b33fdfb8c12 100644
--- a/llvm/unittests/Frontend/HLSLRootSignatureDumpTest.cpp
+++ b/llvm/unittests/Frontend/HLSLRootSignatureDumpTest.cpp
@@ -17,7 +17,7 @@ TEST(HLSLRootSignatureTest, DescriptorCBVClauseDump) {
   DescriptorTableClause Clause;
   Clause.Type = ClauseType::CBuffer;
   Clause.Reg = {RegisterType::BReg, 0};
-  Clause.setDefaultFlags();
+  Clause.setDefaultFlags(llvm::dxbc::RootSignatureVersion::V1_1);
 
   std::string Out;
   llvm::raw_string_ostream OS(Out);
@@ -100,6 +100,40 @@ TEST(HLSLRootSignatureTest, DescriptorSamplerClauseDump) {
   EXPECT_EQ(Out, Expected);
 }
 
+TEST(HLSLRootSignatureTest, DescriptorCBVV10ClauseDump) {
+  DescriptorTableClause Clause;
+  Clause.Type = ClauseType::CBuffer;
+  Clause.Reg = {RegisterType::BReg, 0};
+  Clause.setDefaultFlags(llvm::dxbc::RootSignatureVersion::V1_0);
+
+  std::string Out;
+  llvm::raw_string_ostream OS(Out);
+  OS << Clause;
+  OS.flush();
+
+  std::string Expected = "CBV(b0, numDescriptors = 1, space = 0, "
+                         "offset = DescriptorTableOffsetAppend, "
+                         "flags = DescriptorsVolatile | DataVolatile)";
+  EXPECT_EQ(Out, Expected);
+}
+
+TEST(HLSLRootSignatureTest, DescriptorSamplerV10ClauseDump) {
+  DescriptorTableClause Clause;
+  Clause.Type = ClauseType::Sampler;
+  Clause.Reg = {RegisterType::SReg, 0};
+  Clause.setDefaultFlags(llvm::dxbc::RootSignatureVersion::V1_0);
+
+  std::string Out;
+  llvm::raw_string_ostream OS(Out);
+  OS << Clause;
+  OS.flush();
+
+  std::string Expected = "Sampler(s0, numDescriptors = 1, space = 0, offset = "
+                         "DescriptorTableOffsetAppend, "
+                         "flags = DescriptorsVolatile)";
+  EXPECT_EQ(Out, Expected);
+}
+
 TEST(HLSLRootSignatureTest, DescriptorTableDump) {
   DescriptorTable Table;
   Table.NumClauses = 4;
@@ -119,7 +153,7 @@ TEST(HLSLRootSignatureTest, RootCBVDump) {
   RootDescriptor Descriptor;
   Descriptor.Type = DescriptorType::CBuffer;
   Descriptor.Reg = {RegisterType::BReg, 0};
-  Descriptor.setDefaultFlags();
+  Descriptor.setDefaultFlags(llvm::dxbc::RootSignatureVersion::V1_1);
 
   std::string Out;
   llvm::raw_string_ostream OS(Out);
@@ -132,6 +166,40 @@ TEST(HLSLRootSignatureTest, RootCBVDump) {
   EXPECT_EQ(Out, Expected);
 }
 
+TEST(HLSLRootSignatureTest, RootSRV10Dump) {
+  RootDescriptor Descriptor;
+  Descriptor.Type = DescriptorType::SRV;
+  Descriptor.Reg = {RegisterType::TReg, 0};
+  Descriptor.setDefaultFlags(llvm::dxbc::RootSignatureVersion::V1_0);
+
+  std::string Out;
+  llvm::raw_string_ostream OS(Out);
+  OS << Descriptor;
+  OS.flush();
+
+  std::string Expected = "RootSRV(t0, space = 0, "
+                         "visibility = All, "
+                         "flags = DataVolatile)";
+  EXPECT_EQ(Out, Expected);
+}
+
+TEST(HLSLRootSignatureTest, RootUAVV10Dump) {
+  RootDescriptor Descriptor;
+  Descriptor.Type = DescriptorType::UAV;
+  Descriptor.Reg = {RegisterType::UReg, 0};
+  Descriptor.setDefaultFlags(llvm::dxbc::RootSignatureVersion::V1_0);
+
+  std::string Out;
+  llvm::raw_string_ostream OS(Out);
+  OS << Descriptor;
+  OS.flush();
+
+  std::string Expected = "RootUAV(u0, space = 0, "
+                         "visibility = All, "
+                         "flags = DataVolatile)";
+  EXPECT_EQ(Out, Expected);
+}
+
 TEST(HLSLRootSignatureTest, RootSRVDump) {
   RootDescriptor Descriptor;
   Descriptor.Type = DescriptorType::SRV;


        
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