[HLSL][RootSignature] Add Metadata generation of Root Signatures for Attr #125131

inbelic · 2025-01-30T23:03:10Z

Define and implement MetadataBuilder in HLSLRootSignature
Integrate and invoke the builder in CGHLSLRuntime.cpp to generate the Root Signature for any associated entry functions
Add tests to demonstrate functionality in RootSignature.hlsl

Resolves #126584

github-actions · 2025-01-30T23:06:49Z

✅ With the latest revision this PR passed the C/C++ code formatter.

- test that we have the correct number of elements

llvmbot · 2025-02-13T00:22:50Z

@llvm/pr-subscribers-hlsl

@llvm/pr-subscribers-clang

Author: Finn Plummer (inbelic)

Changes

Define and implement MetadataBuilder in HLSLRootSignature
Integrate and invoke the builder in CGHLSLRuntime.cpp to generate the Root Signature for any associated entry functions
Add tests to demonstrate functionality in RootSignature.hlsl

Resolves #126584

Full diff: https://github.com/llvm/llvm-project/pull/125131.diff

5 Files Affected:

(modified) clang/lib/CodeGen/CGHLSLRuntime.cpp (+20)
(added) clang/test/CodeGenHLSL/RootSignature.hlsl (+29)
(modified) llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h (+27)
(modified) llvm/lib/Frontend/HLSL/CMakeLists.txt (+1)
(added) llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp (+108)

diff --git a/clang/lib/CodeGen/CGHLSLRuntime.cpp b/clang/lib/CodeGen/CGHLSLRuntime.cpp
index c354e58e15f4b..62d062be91046 100644
--- a/clang/lib/CodeGen/CGHLSLRuntime.cpp
+++ b/clang/lib/CodeGen/CGHLSLRuntime.cpp
@@ -119,6 +119,20 @@ GlobalVariable *replaceBuffer(CGHLSLRuntime::Buffer &Buf) {
   return CBGV;
 }
 
+void addRootSignature(ArrayRef<llvm::hlsl::rootsig::RootElement> Elements,
+                      llvm::Function *Fn, llvm::Module &M) {
+  auto &Ctx = M.getContext();
+
+  llvm::hlsl::rootsig::MetadataBuilder Builder(Ctx, Elements);
+  MDNode *RootSignature = Builder.BuildRootSignature();
+  MDNode *FnPairing =
+      MDNode::get(Ctx, {ValueAsMetadata::get(Fn), RootSignature});
+
+  StringRef RootSignatureValKey = "dx.rootsignatures";
+  auto *RootSignatureValMD = M.getOrInsertNamedMetadata(RootSignatureValKey);
+  RootSignatureValMD->addOperand(FnPairing);
+}
+
 } // namespace
 
 llvm::Type *CGHLSLRuntime::convertHLSLSpecificType(const Type *T) {
@@ -453,6 +467,12 @@ void CGHLSLRuntime::emitEntryFunction(const FunctionDecl *FD,
   // FIXME: Handle codegen for return type semantics.
   // See: https://github.com/llvm/llvm-project/issues/57875
   B.CreateRetVoid();
+
+  // Add and identify root signature to function, if applicable
+  const AttrVec &Attrs = FD->getAttrs();
+  for (const Attr *Attr : Attrs)
+    if (const auto *RSAttr = dyn_cast<HLSLRootSignatureAttr>(Attr))
+      addRootSignature(RSAttr->getElements(), EntryFn, M);
 }
 
 void CGHLSLRuntime::setHLSLFunctionAttributes(const FunctionDecl *FD,
diff --git a/clang/test/CodeGenHLSL/RootSignature.hlsl b/clang/test/CodeGenHLSL/RootSignature.hlsl
new file mode 100644
index 0000000000000..76aa2690b96a7
--- /dev/null
+++ b/clang/test/CodeGenHLSL/RootSignature.hlsl
@@ -0,0 +1,29 @@
+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -emit-llvm -o - %s | FileCheck %s
+
+// CHECK-DAG: ![[#EMPTY:]] = !{}
+[shader("compute"), RootSignature("")]
+[numthreads(1,1,1)]
+void FirstEntry() {}
+
+// CHECK-DAG: ![[#CBV:]] = !{!"CBV", i32 1, i32 0, i32 0, i32 -1, i32 4}
+// CHECK-DAG: ![[#SRV:]] = !{!"SRV", i32 4, i32 42, i32 3, i32 32, i32 0}
+// CHECK-DAG: ![[#TABLE:]] = !{!"DescriptorTable", i32 0, ![[#CBV]], ![[#SRV]]}
+// CHECK-DAG: ![[#SECOND_RS:]] = !{![[#TABLE]]}
+
+#define SampleDescriptorTable \
+  "DescriptorTable( " \
+  "  CBV(b0), " \
+  "  SRV(t42, space = 3, offset = 32, numDescriptors = 4, flags = 0) " \
+  ")"
+[shader("compute"), RootSignature(SampleDescriptorTable)]
+[numthreads(1,1,1)]
+void SecondEntry() {}
+
+// Sanity test to ensure no root is added for this function
+[shader("compute")]
+[numthreads(1,1,1)]
+void ThirdEntry() {}
+
+// CHECK-DAG: ![[#FIRST_ENTRY:]] = !{ptr @FirstEntry, ![[#EMPTY]]}
+// CHECK-DAG: ![[#SECOND_ENTRY:]] = !{ptr @SecondEntry, ![[#SECOND_RS]]}
+// CHECK-DAG: !dx.rootsignatures = !{![[#FIRST_ENTRY]], ![[#SECOND_ENTRY]]}
diff --git a/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h b/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
index f999a0b5eef33..d1c39b720d213 100644
--- a/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
+++ b/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
@@ -14,10 +14,16 @@
 #ifndef LLVM_FRONTEND_HLSL_HLSLROOTSIGNATURE_H
 #define LLVM_FRONTEND_HLSL_HLSLROOTSIGNATURE_H
 
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/STLForwardCompat.h"
 #include "llvm/Support/DXILABI.h"
 #include <variant>
 
 namespace llvm {
+class LLVMContext;
+class MDNode;
+class Metadata;
+
 namespace hlsl {
 namespace rootsig {
 
@@ -122,6 +128,27 @@ using RootElement = std::variant<DescriptorTable, DescriptorTableClause>;
 using ParamType = std::variant<uint32_t *, DescriptorRangeOffset *,
                                DescriptorRangeFlags *, ShaderVisibility *>;
 
+class MetadataBuilder {
+public:
+  MetadataBuilder(llvm::LLVMContext &Ctx, ArrayRef<RootElement> Elements)
+      : Ctx(Ctx), Elements(Elements) {}
+
+  /// Iterates through the elements and dispatches onto the correct Build method
+  ///
+  /// Accumulates the root signature and returns the Metadata node that is just
+  /// a list of all the elements
+  MDNode *BuildRootSignature();
+
+private:
+  /// Define the various builders for the different metadata types
+  MDNode *BuildDescriptorTable(const DescriptorTable &Table);
+  MDNode *BuildDescriptorTableClause(const DescriptorTableClause &Clause);
+
+  llvm::LLVMContext &Ctx;
+  ArrayRef<RootElement> Elements;
+  SmallVector<Metadata *> GeneratedMetadata;
+};
+
 } // namespace rootsig
 } // namespace hlsl
 } // namespace llvm
diff --git a/llvm/lib/Frontend/HLSL/CMakeLists.txt b/llvm/lib/Frontend/HLSL/CMakeLists.txt
index eda6cb8e69a49..739bfef8dbc37 100644
--- a/llvm/lib/Frontend/HLSL/CMakeLists.txt
+++ b/llvm/lib/Frontend/HLSL/CMakeLists.txt
@@ -1,5 +1,6 @@
 add_llvm_component_library(LLVMFrontendHLSL
   HLSLResource.cpp
+  HLSLRootSignature.cpp
 
   ADDITIONAL_HEADER_DIRS
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Frontend
diff --git a/llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp b/llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp
new file mode 100644
index 0000000000000..fb1a2ddc72640
--- /dev/null
+++ b/llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp
@@ -0,0 +1,108 @@
+//===- HLSLRootSignature.cpp - HLSL Root Signature helper objects
+//----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file This file contains helpers for working with HLSL Root Signatures.
+///
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Frontend/HLSL/HLSLRootSignature.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/Metadata.h"
+#include "llvm/IR/Module.h"
+
+namespace llvm {
+namespace hlsl {
+namespace rootsig {
+
+// Static helper functions
+
+static MDString *ClauseTypeToName(LLVMContext &Ctx, ClauseType Type) {
+  StringRef Name;
+  switch (Type) {
+  case ClauseType::CBuffer:
+    Name = "CBV";
+    break;
+  case ClauseType::SRV:
+    Name = "SRV";
+    break;
+  case ClauseType::UAV:
+    Name = "UAV";
+    break;
+  case ClauseType::Sampler:
+    Name = "Sampler";
+    break;
+  }
+  return MDString::get(Ctx, Name);
+}
+
+// Helper struct so that we can use the overloaded notation of std::visit
+template <class... Ts> struct OverloadBuilds : Ts... {
+  using Ts::operator()...;
+};
+template <class... Ts> OverloadBuilds(Ts...) -> OverloadBuilds<Ts...>;
+
+MDNode *MetadataBuilder::BuildRootSignature() {
+  for (const RootElement &Element : Elements) {
+    MDNode *ElementMD =
+        std::visit(OverloadBuilds{
+                       [&](DescriptorTable Table) -> MDNode * {
+                         return BuildDescriptorTable(Table);
+                       },
+                       [&](DescriptorTableClause Clause) -> MDNode * {
+                         return BuildDescriptorTableClause(Clause);
+                       },
+                   },
+                   Element);
+    GeneratedMetadata.push_back(ElementMD);
+  }
+
+  return MDNode::get(Ctx, GeneratedMetadata);
+}
+
+MDNode *MetadataBuilder::BuildDescriptorTable(const DescriptorTable &Table) {
+  IRBuilder<> B(Ctx);
+  SmallVector<Metadata *> TableOperands;
+  // Set the mandatory arguments
+  TableOperands.push_back(MDString::get(Ctx, "DescriptorTable"));
+  TableOperands.push_back(ConstantAsMetadata::get(
+      B.getInt32(llvm::to_underlying(Table.Visibility))));
+
+  // Remaining operands are references to the table's clauses. The in-memory
+  // representation of the Root Elements created from parsing will ensure that
+  // the previous N elements are the clauses for this table.
+  assert(Table.NumClauses <= GeneratedMetadata.size() &&
+         "Table expected all owned clauses to be generated already");
+  // So, add a refence to each clause to our operands
+  TableOperands.append(GeneratedMetadata.end() - Table.NumClauses,
+                       GeneratedMetadata.end());
+  // Then, remove those clauses from the general list of Root Elements
+  GeneratedMetadata.pop_back_n(Table.NumClauses);
+
+  return MDNode::get(Ctx, TableOperands);
+}
+
+MDNode *MetadataBuilder::BuildDescriptorTableClause(
+    const DescriptorTableClause &Clause) {
+  IRBuilder<> B(Ctx);
+  return MDNode::get(
+      Ctx, {
+               ClauseTypeToName(Ctx, Clause.Type),
+               ConstantAsMetadata::get(B.getInt32(Clause.NumDescriptors)),
+               ConstantAsMetadata::get(B.getInt32(Clause.Register.Number)),
+               ConstantAsMetadata::get(B.getInt32(Clause.Space)),
+               ConstantAsMetadata::get(
+                   B.getInt32(llvm::to_underlying(Clause.Offset))),
+               ConstantAsMetadata::get(
+                   B.getInt32(llvm::to_underlying(Clause.Flags))),
+           });
+}
+
+} // namespace rootsig
+} // namespace hlsl
+} // namespace llvm

llvmbot · 2025-02-13T00:22:51Z

@llvm/pr-subscribers-clang-codegen

Author: Finn Plummer (inbelic)

Changes

Define and implement MetadataBuilder in HLSLRootSignature
Integrate and invoke the builder in CGHLSLRuntime.cpp to generate the Root Signature for any associated entry functions
Add tests to demonstrate functionality in RootSignature.hlsl

Resolves #126584

Full diff: https://github.com/llvm/llvm-project/pull/125131.diff

5 Files Affected:

(modified) clang/lib/CodeGen/CGHLSLRuntime.cpp (+20)
(added) clang/test/CodeGenHLSL/RootSignature.hlsl (+29)
(modified) llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h (+27)
(modified) llvm/lib/Frontend/HLSL/CMakeLists.txt (+1)
(added) llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp (+108)

diff --git a/clang/lib/CodeGen/CGHLSLRuntime.cpp b/clang/lib/CodeGen/CGHLSLRuntime.cpp
index c354e58e15f4b..62d062be91046 100644
--- a/clang/lib/CodeGen/CGHLSLRuntime.cpp
+++ b/clang/lib/CodeGen/CGHLSLRuntime.cpp
@@ -119,6 +119,20 @@ GlobalVariable *replaceBuffer(CGHLSLRuntime::Buffer &Buf) {
   return CBGV;
 }
 
+void addRootSignature(ArrayRef<llvm::hlsl::rootsig::RootElement> Elements,
+                      llvm::Function *Fn, llvm::Module &M) {
+  auto &Ctx = M.getContext();
+
+  llvm::hlsl::rootsig::MetadataBuilder Builder(Ctx, Elements);
+  MDNode *RootSignature = Builder.BuildRootSignature();
+  MDNode *FnPairing =
+      MDNode::get(Ctx, {ValueAsMetadata::get(Fn), RootSignature});
+
+  StringRef RootSignatureValKey = "dx.rootsignatures";
+  auto *RootSignatureValMD = M.getOrInsertNamedMetadata(RootSignatureValKey);
+  RootSignatureValMD->addOperand(FnPairing);
+}
+
 } // namespace
 
 llvm::Type *CGHLSLRuntime::convertHLSLSpecificType(const Type *T) {
@@ -453,6 +467,12 @@ void CGHLSLRuntime::emitEntryFunction(const FunctionDecl *FD,
   // FIXME: Handle codegen for return type semantics.
   // See: https://github.com/llvm/llvm-project/issues/57875
   B.CreateRetVoid();
+
+  // Add and identify root signature to function, if applicable
+  const AttrVec &Attrs = FD->getAttrs();
+  for (const Attr *Attr : Attrs)
+    if (const auto *RSAttr = dyn_cast<HLSLRootSignatureAttr>(Attr))
+      addRootSignature(RSAttr->getElements(), EntryFn, M);
 }
 
 void CGHLSLRuntime::setHLSLFunctionAttributes(const FunctionDecl *FD,
diff --git a/clang/test/CodeGenHLSL/RootSignature.hlsl b/clang/test/CodeGenHLSL/RootSignature.hlsl
new file mode 100644
index 0000000000000..76aa2690b96a7
--- /dev/null
+++ b/clang/test/CodeGenHLSL/RootSignature.hlsl
@@ -0,0 +1,29 @@
+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -emit-llvm -o - %s | FileCheck %s
+
+// CHECK-DAG: ![[#EMPTY:]] = !{}
+[shader("compute"), RootSignature("")]
+[numthreads(1,1,1)]
+void FirstEntry() {}
+
+// CHECK-DAG: ![[#CBV:]] = !{!"CBV", i32 1, i32 0, i32 0, i32 -1, i32 4}
+// CHECK-DAG: ![[#SRV:]] = !{!"SRV", i32 4, i32 42, i32 3, i32 32, i32 0}
+// CHECK-DAG: ![[#TABLE:]] = !{!"DescriptorTable", i32 0, ![[#CBV]], ![[#SRV]]}
+// CHECK-DAG: ![[#SECOND_RS:]] = !{![[#TABLE]]}
+
+#define SampleDescriptorTable \
+  "DescriptorTable( " \
+  "  CBV(b0), " \
+  "  SRV(t42, space = 3, offset = 32, numDescriptors = 4, flags = 0) " \
+  ")"
+[shader("compute"), RootSignature(SampleDescriptorTable)]
+[numthreads(1,1,1)]
+void SecondEntry() {}
+
+// Sanity test to ensure no root is added for this function
+[shader("compute")]
+[numthreads(1,1,1)]
+void ThirdEntry() {}
+
+// CHECK-DAG: ![[#FIRST_ENTRY:]] = !{ptr @FirstEntry, ![[#EMPTY]]}
+// CHECK-DAG: ![[#SECOND_ENTRY:]] = !{ptr @SecondEntry, ![[#SECOND_RS]]}
+// CHECK-DAG: !dx.rootsignatures = !{![[#FIRST_ENTRY]], ![[#SECOND_ENTRY]]}
diff --git a/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h b/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
index f999a0b5eef33..d1c39b720d213 100644
--- a/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
+++ b/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
@@ -14,10 +14,16 @@
 #ifndef LLVM_FRONTEND_HLSL_HLSLROOTSIGNATURE_H
 #define LLVM_FRONTEND_HLSL_HLSLROOTSIGNATURE_H
 
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/STLForwardCompat.h"
 #include "llvm/Support/DXILABI.h"
 #include <variant>
 
 namespace llvm {
+class LLVMContext;
+class MDNode;
+class Metadata;
+
 namespace hlsl {
 namespace rootsig {
 
@@ -122,6 +128,27 @@ using RootElement = std::variant<DescriptorTable, DescriptorTableClause>;
 using ParamType = std::variant<uint32_t *, DescriptorRangeOffset *,
                                DescriptorRangeFlags *, ShaderVisibility *>;
 
+class MetadataBuilder {
+public:
+  MetadataBuilder(llvm::LLVMContext &Ctx, ArrayRef<RootElement> Elements)
+      : Ctx(Ctx), Elements(Elements) {}
+
+  /// Iterates through the elements and dispatches onto the correct Build method
+  ///
+  /// Accumulates the root signature and returns the Metadata node that is just
+  /// a list of all the elements
+  MDNode *BuildRootSignature();
+
+private:
+  /// Define the various builders for the different metadata types
+  MDNode *BuildDescriptorTable(const DescriptorTable &Table);
+  MDNode *BuildDescriptorTableClause(const DescriptorTableClause &Clause);
+
+  llvm::LLVMContext &Ctx;
+  ArrayRef<RootElement> Elements;
+  SmallVector<Metadata *> GeneratedMetadata;
+};
+
 } // namespace rootsig
 } // namespace hlsl
 } // namespace llvm
diff --git a/llvm/lib/Frontend/HLSL/CMakeLists.txt b/llvm/lib/Frontend/HLSL/CMakeLists.txt
index eda6cb8e69a49..739bfef8dbc37 100644
--- a/llvm/lib/Frontend/HLSL/CMakeLists.txt
+++ b/llvm/lib/Frontend/HLSL/CMakeLists.txt
@@ -1,5 +1,6 @@
 add_llvm_component_library(LLVMFrontendHLSL
   HLSLResource.cpp
+  HLSLRootSignature.cpp
 
   ADDITIONAL_HEADER_DIRS
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Frontend
diff --git a/llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp b/llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp
new file mode 100644
index 0000000000000..fb1a2ddc72640
--- /dev/null
+++ b/llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp
@@ -0,0 +1,108 @@
+//===- HLSLRootSignature.cpp - HLSL Root Signature helper objects
+//----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file This file contains helpers for working with HLSL Root Signatures.
+///
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Frontend/HLSL/HLSLRootSignature.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/Metadata.h"
+#include "llvm/IR/Module.h"
+
+namespace llvm {
+namespace hlsl {
+namespace rootsig {
+
+// Static helper functions
+
+static MDString *ClauseTypeToName(LLVMContext &Ctx, ClauseType Type) {
+  StringRef Name;
+  switch (Type) {
+  case ClauseType::CBuffer:
+    Name = "CBV";
+    break;
+  case ClauseType::SRV:
+    Name = "SRV";
+    break;
+  case ClauseType::UAV:
+    Name = "UAV";
+    break;
+  case ClauseType::Sampler:
+    Name = "Sampler";
+    break;
+  }
+  return MDString::get(Ctx, Name);
+}
+
+// Helper struct so that we can use the overloaded notation of std::visit
+template <class... Ts> struct OverloadBuilds : Ts... {
+  using Ts::operator()...;
+};
+template <class... Ts> OverloadBuilds(Ts...) -> OverloadBuilds<Ts...>;
+
+MDNode *MetadataBuilder::BuildRootSignature() {
+  for (const RootElement &Element : Elements) {
+    MDNode *ElementMD =
+        std::visit(OverloadBuilds{
+                       [&](DescriptorTable Table) -> MDNode * {
+                         return BuildDescriptorTable(Table);
+                       },
+                       [&](DescriptorTableClause Clause) -> MDNode * {
+                         return BuildDescriptorTableClause(Clause);
+                       },
+                   },
+                   Element);
+    GeneratedMetadata.push_back(ElementMD);
+  }
+
+  return MDNode::get(Ctx, GeneratedMetadata);
+}
+
+MDNode *MetadataBuilder::BuildDescriptorTable(const DescriptorTable &Table) {
+  IRBuilder<> B(Ctx);
+  SmallVector<Metadata *> TableOperands;
+  // Set the mandatory arguments
+  TableOperands.push_back(MDString::get(Ctx, "DescriptorTable"));
+  TableOperands.push_back(ConstantAsMetadata::get(
+      B.getInt32(llvm::to_underlying(Table.Visibility))));
+
+  // Remaining operands are references to the table's clauses. The in-memory
+  // representation of the Root Elements created from parsing will ensure that
+  // the previous N elements are the clauses for this table.
+  assert(Table.NumClauses <= GeneratedMetadata.size() &&
+         "Table expected all owned clauses to be generated already");
+  // So, add a refence to each clause to our operands
+  TableOperands.append(GeneratedMetadata.end() - Table.NumClauses,
+                       GeneratedMetadata.end());
+  // Then, remove those clauses from the general list of Root Elements
+  GeneratedMetadata.pop_back_n(Table.NumClauses);
+
+  return MDNode::get(Ctx, TableOperands);
+}
+
+MDNode *MetadataBuilder::BuildDescriptorTableClause(
+    const DescriptorTableClause &Clause) {
+  IRBuilder<> B(Ctx);
+  return MDNode::get(
+      Ctx, {
+               ClauseTypeToName(Ctx, Clause.Type),
+               ConstantAsMetadata::get(B.getInt32(Clause.NumDescriptors)),
+               ConstantAsMetadata::get(B.getInt32(Clause.Register.Number)),
+               ConstantAsMetadata::get(B.getInt32(Clause.Space)),
+               ConstantAsMetadata::get(
+                   B.getInt32(llvm::to_underlying(Clause.Offset))),
+               ConstantAsMetadata::get(
+                   B.getInt32(llvm::to_underlying(Clause.Flags))),
+           });
+}
+
+} // namespace rootsig
+} // namespace hlsl
+} // namespace llvm

clang/test/CodeGenHLSL/RootSignature.hlsl

llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp

bob80905 · 2025-03-05T18:52:09Z

llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp

+  TableOperands.push_back(ConstantAsMetadata::get(
+      B.getInt32(llvm::to_underlying(Table.Visibility))));
+
+  // Remaining operands are references to the table's clauses. The in-memory


Very helpful 👍

bob80905

Just a nit but this looks good to me

clang/test/CodeGenHLSL/RootSignature.hlsl

llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h

llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp

clang/test/CodeGenHLSL/RootSignature.hlsl

…139633) - prereq: Modify `RootSignatureAttr` to hold a reference to the owned declaration - Define and implement `MetadataBuilder` in `HLSLRootSignature` - Integrate and invoke the builder in `CGHLSLRuntime.cpp` to generate the Root Signature for any associated entry functions - Add tests to demonstrate functionality in `RootSignature.hlsl` Resolves #126584 Note: this is essentially just #125131 rebased onto the new approach of constructing a root signature decl, instead of holding the elements in `AdditionalMembers`.

…or tables (#139633) - prereq: Modify `RootSignatureAttr` to hold a reference to the owned declaration - Define and implement `MetadataBuilder` in `HLSLRootSignature` - Integrate and invoke the builder in `CGHLSLRuntime.cpp` to generate the Root Signature for any associated entry functions - Add tests to demonstrate functionality in `RootSignature.hlsl` Resolves llvm/llvm-project#126584 Note: this is essentially just llvm/llvm-project#125131 rebased onto the new approach of constructing a root signature decl, instead of holding the elements in `AdditionalMembers`.

inbelic linked an issue Feb 10, 2025 that may be closed by this pull request

[HLSL] Generate Root Signature Descriptor Table Metadata from AST #126584

Closed

5 tasks

inbelic mentioned this pull request Feb 12, 2025

[HLSL] Define the HLSLRootSignature Attr #123985

Closed

inbelic force-pushed the users/inbelic/pr-123985 branch from 14e7253 to 4180ab7 Compare February 12, 2025 23:31

inbelic added 5 commits February 12, 2025 23:40

add basic empty root signature

abe7e67

pass down the actual root elements

671f099

- test that we have the correct number of elements

introduce a MetadataBuilder to handle the construction of nodes

d02cb55

add support for DescriptorTableClauses

28c6dfa

add support for associating DescriptorTables with their clauses

9bdf703

inbelic force-pushed the inbelic/gen-ast-dt branch from 039f49d to 1d3408c Compare February 12, 2025 23:49

self-review: misc clean up

05e7c0f

inbelic force-pushed the inbelic/gen-ast-dt branch from 1d3408c to 05e7c0f Compare February 13, 2025 00:10

inbelic marked this pull request as ready for review February 13, 2025 00:22

llvmbot added clang Clang issues not falling into any other category clang:codegen IR generation bugs: mangling, exceptions, etc. HLSL HLSL Language Support labels Feb 13, 2025

bob80905 reviewed Feb 26, 2025

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review: remove use of CHECK-DAG

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bob80905 reviewed Mar 5, 2025

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llvm/lib/Frontend/HLSL/HLSLRootSignature.cpp Show resolved Hide resolved

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bob80905 approved these changes Mar 5, 2025

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hekota mentioned this pull request Mar 7, 2025

[HLSL] Remove old resource annotations #130338

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inbelic requested a review from joaosaffran March 7, 2025 23:51

joaosaffran reviewed Mar 8, 2025

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inbelic deleted the branch llvm:users/inbelic/pr-123985 March 31, 2025 21:05

inbelic closed this Mar 31, 2025

github-project-automation bot moved this to Closed in HLSL Support Mar 31, 2025

inbelic mentioned this pull request May 12, 2025

[HLSL][RootSignature] Add metadata generation for descriptor tables #139633

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inbelic deleted the inbelic/gen-ast-dt branch May 16, 2025 18:07

damyanp removed this from HLSL Support Jun 25, 2025

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[HLSL][RootSignature] Add Metadata generation of Root Signatures for Attr #125131

[HLSL][RootSignature] Add Metadata generation of Root Signatures for Attr #125131

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inbelic commented Jan 30, 2025 •

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[HLSL][RootSignature] Add Metadata generation of Root Signatures for Attr #125131

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