[HLSL] Disallow writing to readonly resources #147806
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@llvm/pr-subscribers-clang Author: Ashley Coleman (V-FEXrt) ChangesFixes #141842 Only add the non-const subscript operator to write resources Full diff: https://github.com/llvm/llvm-project/pull/147806.diff 4 Files Affected:
diff --git a/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.cpp b/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.cpp
index e5c6220bfb47d..7c08a917f24be 100644
--- a/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.cpp
+++ b/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.cpp
@@ -613,6 +613,17 @@ BuiltinTypeDeclBuilder &BuiltinTypeDeclBuilder::addHandleMember(
ResourceClass RC, bool IsROV, bool RawBuffer, AccessSpecifier Access) {
assert(!Record->isCompleteDefinition() && "record is already complete");
+ switch (RC) {
+ case llvm::dxil::ResourceClass::UAV:
+ IsConstResourceClass = false;
+ break;
+ case llvm::dxil::ResourceClass::SRV:
+ case llvm::dxil::ResourceClass::CBuffer:
+ case llvm::dxil::ResourceClass::Sampler:
+ IsConstResourceClass = true;
+ break;
+ };
+
ASTContext &Ctx = SemaRef.getASTContext();
TypeSourceInfo *ElementTypeInfo =
Ctx.getTrivialTypeSourceInfo(getHandleElementType(), SourceLocation());
@@ -697,7 +708,9 @@ BuiltinTypeDeclBuilder &BuiltinTypeDeclBuilder::addArraySubscriptOperators() {
AST.DeclarationNames.getCXXOperatorName(OO_Subscript);
addHandleAccessFunction(Subscript, /*IsConst=*/true, /*IsRef=*/true);
- addHandleAccessFunction(Subscript, /*IsConst=*/false, /*IsRef=*/true);
+ if (!IsConstResourceClass)
+ addHandleAccessFunction(Subscript, /*IsConst=*/false, /*IsRef=*/true);
+
return *this;
}
diff --git a/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.h b/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.h
index a52e2938104c7..d8fac3cebc94a 100644
--- a/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.h
+++ b/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.h
@@ -52,6 +52,7 @@ class BuiltinTypeDeclBuilder {
ClassTemplateDecl *PrevTemplate = nullptr;
NamespaceDecl *HLSLNamespace = nullptr;
llvm::StringMap<FieldDecl *> Fields;
+ bool IsConstResourceClass = false;
public:
friend struct TemplateParameterListBuilder;
diff --git a/clang/test/SemaHLSL/BuiltIns/Buffers.hlsl b/clang/test/SemaHLSL/BuiltIns/Buffers.hlsl
index 477a16a454a9c..d7c6876d3b9e3 100644
--- a/clang/test/SemaHLSL/BuiltIns/Buffers.hlsl
+++ b/clang/test/SemaHLSL/BuiltIns/Buffers.hlsl
@@ -111,4 +111,8 @@ Buffer<threeDoubles> BufferErr3;
void main() {
(void)Buff.__handle; // expected-error {{'__handle' is a private member of 'hlsl::Buffer<vector<float, 3>>'}}
// expected-note@* {{implicitly declared private here}}
+
+ // expected-error@+2 {{cannot assign to return value because function 'operator[]' returns a const value}}
+ // expected-note@* {{function 'operator[]' which returns const-qualified type 'vector<float const hlsl_device &, 3>' declared here}}
+ Buff[0] = 0.0;
}
diff --git a/clang/test/SemaHLSL/BuiltIns/StructuredBuffers.hlsl b/clang/test/SemaHLSL/BuiltIns/StructuredBuffers.hlsl
index bf541f4a07da7..fbd9288590adc 100644
--- a/clang/test/SemaHLSL/BuiltIns/StructuredBuffers.hlsl
+++ b/clang/test/SemaHLSL/BuiltIns/StructuredBuffers.hlsl
@@ -28,4 +28,8 @@ StructuredBuffer<Empty> BufferErr4;
void main() {
(void)Buff.__handle; // expected-error {{'__handle' is a private member of 'hlsl::StructuredBuffer<vector<float, 3>>'}}
// expected-note@* {{implicitly declared private here}}
+
+ // expected-error@+2 {{cannot assign to return value because function 'operator[]' returns a const value}}
+ // expected-note@* {{function 'operator[]' which returns const-qualified type 'vector<float const hlsl_device &, 3>' declared here}}
+ Buff[0] = 0.0;
}
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@llvm/pr-subscribers-hlsl Author: Ashley Coleman (V-FEXrt) ChangesFixes #141842 Only add the non-const subscript operator to write resources Full diff: https://github.com/llvm/llvm-project/pull/147806.diff 4 Files Affected:
diff --git a/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.cpp b/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.cpp
index e5c6220bfb47d..7c08a917f24be 100644
--- a/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.cpp
+++ b/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.cpp
@@ -613,6 +613,17 @@ BuiltinTypeDeclBuilder &BuiltinTypeDeclBuilder::addHandleMember(
ResourceClass RC, bool IsROV, bool RawBuffer, AccessSpecifier Access) {
assert(!Record->isCompleteDefinition() && "record is already complete");
+ switch (RC) {
+ case llvm::dxil::ResourceClass::UAV:
+ IsConstResourceClass = false;
+ break;
+ case llvm::dxil::ResourceClass::SRV:
+ case llvm::dxil::ResourceClass::CBuffer:
+ case llvm::dxil::ResourceClass::Sampler:
+ IsConstResourceClass = true;
+ break;
+ };
+
ASTContext &Ctx = SemaRef.getASTContext();
TypeSourceInfo *ElementTypeInfo =
Ctx.getTrivialTypeSourceInfo(getHandleElementType(), SourceLocation());
@@ -697,7 +708,9 @@ BuiltinTypeDeclBuilder &BuiltinTypeDeclBuilder::addArraySubscriptOperators() {
AST.DeclarationNames.getCXXOperatorName(OO_Subscript);
addHandleAccessFunction(Subscript, /*IsConst=*/true, /*IsRef=*/true);
- addHandleAccessFunction(Subscript, /*IsConst=*/false, /*IsRef=*/true);
+ if (!IsConstResourceClass)
+ addHandleAccessFunction(Subscript, /*IsConst=*/false, /*IsRef=*/true);
+
return *this;
}
diff --git a/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.h b/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.h
index a52e2938104c7..d8fac3cebc94a 100644
--- a/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.h
+++ b/clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.h
@@ -52,6 +52,7 @@ class BuiltinTypeDeclBuilder {
ClassTemplateDecl *PrevTemplate = nullptr;
NamespaceDecl *HLSLNamespace = nullptr;
llvm::StringMap<FieldDecl *> Fields;
+ bool IsConstResourceClass = false;
public:
friend struct TemplateParameterListBuilder;
diff --git a/clang/test/SemaHLSL/BuiltIns/Buffers.hlsl b/clang/test/SemaHLSL/BuiltIns/Buffers.hlsl
index 477a16a454a9c..d7c6876d3b9e3 100644
--- a/clang/test/SemaHLSL/BuiltIns/Buffers.hlsl
+++ b/clang/test/SemaHLSL/BuiltIns/Buffers.hlsl
@@ -111,4 +111,8 @@ Buffer<threeDoubles> BufferErr3;
void main() {
(void)Buff.__handle; // expected-error {{'__handle' is a private member of 'hlsl::Buffer<vector<float, 3>>'}}
// expected-note@* {{implicitly declared private here}}
+
+ // expected-error@+2 {{cannot assign to return value because function 'operator[]' returns a const value}}
+ // expected-note@* {{function 'operator[]' which returns const-qualified type 'vector<float const hlsl_device &, 3>' declared here}}
+ Buff[0] = 0.0;
}
diff --git a/clang/test/SemaHLSL/BuiltIns/StructuredBuffers.hlsl b/clang/test/SemaHLSL/BuiltIns/StructuredBuffers.hlsl
index bf541f4a07da7..fbd9288590adc 100644
--- a/clang/test/SemaHLSL/BuiltIns/StructuredBuffers.hlsl
+++ b/clang/test/SemaHLSL/BuiltIns/StructuredBuffers.hlsl
@@ -28,4 +28,8 @@ StructuredBuffer<Empty> BufferErr4;
void main() {
(void)Buff.__handle; // expected-error {{'__handle' is a private member of 'hlsl::StructuredBuffer<vector<float, 3>>'}}
// expected-note@* {{implicitly declared private here}}
+
+ // expected-error@+2 {{cannot assign to return value because function 'operator[]' returns a const value}}
+ // expected-note@* {{function 'operator[]' which returns const-qualified type 'vector<float const hlsl_device &, 3>' declared here}}
+ Buff[0] = 0.0;
}
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V-FEXrt
commented
Jul 9, 2025
spall
approved these changes
Jul 9, 2025
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Fixes #141842
Only add the non-const subscript operator to write resources