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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_AST_FUNCTION_H_
#define SRC_AST_FUNCTION_H_
#include <string>
#include <tuple>
#include <utility>
#include <vector>
#include "src/ast/binding_decoration.h"
#include "src/ast/block_statement.h"
#include "src/ast/builtin_decoration.h"
#include "src/ast/decoration.h"
#include "src/ast/group_decoration.h"
#include "src/ast/location_decoration.h"
#include "src/ast/pipeline_stage.h"
#include "src/ast/variable.h"
namespace tint {
namespace ast {
/// A Function statement.
class Function : public Castable<Function, Node> {
public:
/// Create a function
/// @param program_id the identifier of the program that owns this node
/// @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 decorations the function decorations
/// @param return_type_decorations the return type decorations
Function(ProgramID program_id,
const Source& source,
Symbol symbol,
VariableList params,
const Type* return_type,
const BlockStatement* body,
DecorationList decorations,
DecorationList return_type_decorations);
/// 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 VariableList params;
/// The function return type
const Type* const return_type;
/// The function body
const BlockStatement* const body;
/// The decorations attached to this function
const DecorationList decorations;
/// The decorations attached to the function return type.
const DecorationList return_type_decorations;
};
/// A list of functions
class FunctionList : public std::vector<const Function*> {
public:
/// Appends f to the end of the list
/// @param f the function to append to this list
void Add(const Function* f) { this->emplace_back(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 ast
} // namespace tint
#endif // SRC_AST_FUNCTION_H_