src/tint/ast/disable_validation_attribute.h

// Copyright 2021 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef SRC_TINT_AST_DISABLE_VALIDATION_ATTRIBUTE_H_
#define SRC_TINT_AST_DISABLE_VALIDATION_ATTRIBUTE_H_

#include <string>

#include "src/tint/ast/internal_attribute.h"

namespace tint::ast {

/// Enumerator of validation features that can be disabled with a
/// DisableValidationAttribute attribute.
enum class DisabledValidation {
    /// When applied to a function, the validator will not complain there is no body to a function.
    kFunctionHasNoBody,
    /// When applied to a module-scoped variable, the validator will not complain if two resource
    /// variables have the same binding points.
    kBindingPointCollision,
    /// When applied to a variable, the validator will not complain about the declared address
    /// space.
    kIgnoreAddressSpace,
    /// When applied to an entry-point function parameter, the validator will not check for entry IO
    /// attributes.
    kEntryPointParameter,
    /// When applied to a function parameter, the parameter will not be validated.
    kFunctionParameter,
    /// When applied to a member attribute, a stride attribute may be applied to non-array types.
    kIgnoreStrideAttribute,
    /// When applied to a pointer function parameter, the validator will not require a function call
    /// argument passed for that parameter to have a certain form.
    kIgnoreInvalidPointerArgument,
    /// When applied to a function declaration, the validator will not complain if multiple
    /// pointer arguments alias when that function is called.
    kIgnorePointerAliasing,
    /// When applied to a struct, validation of max number of members is skipped.
    kIgnoreStructMemberLimit,
};

/// An internal attribute used to tell the validator to ignore specific
/// violations. Typically generated by transforms that need to produce ASTs that
/// would otherwise cause validation errors.
class DisableValidationAttribute final
    : public Castable<DisableValidationAttribute, InternalAttribute> {
  public:
    /// Constructor
    /// @param pid the identifier of the program that owns this node
    /// @param nid the unique node identifier
    /// @param validation the validation to disable
    explicit DisableValidationAttribute(ProgramID pid, NodeID nid, DisabledValidation validation);

    /// Destructor
    ~DisableValidationAttribute() override;

    /// @return a short description of the internal attribute which will be
    /// displayed in WGSL as `@internal(<name>)` (but is not parsable).
    std::string InternalName() const override;

    /// Performs a deep clone of this object using the CloneContext `ctx`.
    /// @param ctx the clone context
    /// @return the newly cloned object
    const DisableValidationAttribute* Clone(CloneContext* ctx) const override;

    /// The validation that this attribute disables
    const DisabledValidation validation;
};

}  // namespace tint::ast

#endif  // SRC_TINT_AST_DISABLE_VALIDATION_ATTRIBUTE_H_