| /* |
| * Copyright (C) 2019 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "WHLSLCheckReferenceTypes.h" |
| |
| #if ENABLE(WEBGPU) |
| |
| #include "WHLSLAST.h" |
| #include "WHLSLVisitor.h" |
| |
| namespace WebCore { |
| |
| namespace WHLSL { |
| |
| class ReferenceTypeChecker final : public Visitor { |
| public: |
| ReferenceTypeChecker() = default; |
| virtual ~ReferenceTypeChecker() = default; |
| |
| private: |
| ALWAYS_INLINE void checkType(AST::UnnamedType& type, CodeLocation codeLocation, const char* error) |
| { |
| auto& unifiedType = type.unifyNode(); |
| if (is<AST::ReferenceType>(unifiedType)) { |
| setError(Error(error, codeLocation)); |
| return; |
| } |
| |
| if (is<AST::UnnamedType>(unifiedType)) |
| checkErrorAndVisit(downcast<AST::UnnamedType>(unifiedType)); |
| } |
| |
| void visit(AST::ReferenceType& referenceType) override |
| { |
| checkType(referenceType.elementType(), referenceType.codeLocation(), "reference type cannot have another reference type as an inner type"); |
| } |
| |
| void visit(AST::ArrayType& arrayType) override |
| { |
| checkType(arrayType.type(), arrayType.codeLocation(), "array type cannot have a reference type as its inner type"); |
| } |
| |
| void visit(AST::StructureElement& structureElement) override |
| { |
| checkType(structureElement.type(), structureElement.codeLocation(), "cannot have a structure field which is a reference type"); |
| } |
| |
| void visit(AST::Expression& expression) override |
| { |
| Visitor::visit(expression); |
| checkErrorAndVisit(expression.resolvedType()); |
| } |
| }; |
| |
| Expected<void, Error> checkReferenceTypes(Program& program) |
| { |
| // This pass does these things: |
| // 1. Disallow structs to have fields which are references. This prevents us from having to |
| // figure out how to default initialize such a struct. We could relax this in the future if we |
| // did an analysis on which structs contain reference fields, and ensure such struct variables |
| // always have initializers. This would also require us to create constructors for structs which |
| // initialize each field. |
| // 2. We also do the same for arrays. |
| // 3. References can only be one level deep. So no pointers to pointers. No references to |
| // references, etc. This is to support logical mode. |
| ReferenceTypeChecker referenceTypeChecker; |
| referenceTypeChecker.checkErrorAndVisit(program); |
| return referenceTypeChecker.result(); |
| } |
| |
| } // namespace WHLSL |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(WEBGPU) |