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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_TINT_AST_FUNCTION_H_
#define SRC_TINT_AST_FUNCTION_H_
#include <string>
#include <tuple>
#include <utility>
#include <vector>
#include "src/tint/ast/attribute.h"
#include "src/tint/ast/binding_attribute.h"
#include "src/tint/ast/block_statement.h"
#include "src/tint/ast/builtin_attribute.h"
#include "src/tint/ast/group_attribute.h"
#include "src/tint/ast/location_attribute.h"
#include "src/tint/ast/parameter.h"
#include "src/tint/ast/pipeline_stage.h"
namespace tint::ast {
/// A Function statement.
class Function final : public Castable<Function, Node> {
public:
/// Create a function
/// @param pid the identifier of the program that owns this node
/// @param nid the unique node identifier
/// @param source the variable source
/// @param symbol the function symbol
/// @param params the function parameters
/// @param return_type the return type
/// @param body the function body
/// @param attributes the function attributes
/// @param return_type_attributes the return type attributes
Function(ProgramID pid,
NodeID nid,
const Source& source,
Symbol symbol,
utils::VectorRef<const Parameter*> params,
const Type* return_type,
const BlockStatement* body,
utils::VectorRef<const Attribute*> attributes,
utils::VectorRef<const Attribute*> return_type_attributes);
/// Move constructor
Function(Function&&);
~Function() override;
/// @returns the functions pipeline stage or None if not set
ast::PipelineStage PipelineStage() const;
/// @returns true if this function is an entry point
bool IsEntryPoint() const { return PipelineStage() != PipelineStage::kNone; }
/// Clones this node and all transitive child nodes using the `CloneContext`
/// `ctx`.
/// @param ctx the clone context
/// @return the newly cloned node
const Function* Clone(CloneContext* ctx) const override;
/// The function symbol
const Symbol symbol;
/// The function params
const utils::Vector<const Parameter*, 8> params;
/// The function return type
const Type* const return_type;
/// The function body
const BlockStatement* const body;
/// The attributes attached to this function
const utils::Vector<const Attribute*, 2> attributes;
/// The attributes attached to the function return type.
const utils::Vector<const Attribute*, 2> return_type_attributes;
};
/// A list of functions
class FunctionList : public utils::Vector<const Function*, 8> {
public:
/// Appends f to the end of the list
/// @param f the function to append to this list
void Add(const Function* f) { this->Push(f); }
/// Returns the function with the given name
/// @param sym the function symbol to search for
/// @returns the associated function or nullptr if none exists
const Function* Find(Symbol sym) const;
/// Returns the function with the given name
/// @param sym the function symbol to search for
/// @param stage the pipeline stage
/// @returns the associated function or nullptr if none exists
const Function* Find(Symbol sym, PipelineStage stage) const;
/// @param stage the pipeline stage
/// @returns true if the Builder contains an entrypoint function with
/// the given stage
bool HasStage(PipelineStage stage) const;
};
} // namespace tint::ast
#endif // SRC_TINT_AST_FUNCTION_H_