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// Copyright 2020 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_TRANSFORM_BOUND_ARRAY_ACCESSORS_TRANSFORM_H_
#define SRC_TRANSFORM_BOUND_ARRAY_ACCESSORS_TRANSFORM_H_
#include <string>
#include "src/ast/array_accessor_expression.h"
#include "src/ast/expression.h"
#include "src/ast/module.h"
#include "src/ast/statement.h"
#include "src/context.h"
#include "src/scope_stack.h"
#include "src/transform/transformer.h"
namespace tint {
namespace transform {
/// This transformer is responsible for clamping all array accesses to be within
/// the bounds of the array. Any access before the start of the array will clamp
/// to zero and any access past the end of the array will clamp to
/// (array length - 1).
class BoundArrayAccessorsTransform : public Transformer {
public:
/// Constructor
/// @param ctx the Tint context object
/// @param mod the module transform
explicit BoundArrayAccessorsTransform(Context* ctx, ast::Module* mod);
~BoundArrayAccessorsTransform() override;
/// Users of Tint should register the transform with transform manager and
/// invoke its Run(), instead of directly calling the transform's Run().
/// Calling Run() directly does not perform module state cleanup operations.
/// @returns true if the transformation was successful
bool Run() override;
private:
bool ProcessStatement(ast::Statement* stmt);
bool ProcessExpression(ast::Expression* expr);
bool ProcessArrayAccessor(ast::ArrayAccessorExpression* expr);
bool ProcessAccessExpression(ast::ArrayAccessorExpression* expr,
uint32_t size);
ScopeStack<ast::Variable*> scope_stack_;
};
} // namespace transform
} // namespace tint
#endif // SRC_TRANSFORM_BOUND_ARRAY_ACCESSORS_TRANSFORM_H_