//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// Mangler.hpp --
//
// Author           : Richard C. Bilson
// Created On       : Sun May 17 21:44:03 2015
// Last Modified By : Andrew Beach
// Last Modified On : Thu Oct 27 11:58:00 2022
// Update Count     : 16
//

#pragma once

#include <map>                // for map, map<>::value_compare
#include <sstream>            // for ostringstream
#include <string>             // for string
#include <utility>            // for pair

#include "AST/Bitfield.hpp"

// https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling
// The CFA name mangling scheme is based closely on the itanium C++ name mangling scheme, with the following key differences:
// * Variable names are also mangled to include type information, not just functions
// * CFA does not have template expansion, so the rules for function specialization do not apply.
// * CFA instead has to handle type parameters and assertion parameters.
// * Currently name compression is not implemented.

namespace ast {
	class Node;
}

namespace Mangle {

/// Bitflags for mangle Mode:
enum {
	NoOverrideable  = 1 << 0,
	Type            = 1 << 1,
	NoGenericParams = 1 << 2
};

/// Bitflag type for mangle Mode:
struct mangle_flags {
	union {
		unsigned int val;
		struct {
			bool no_overrideable   : 1;
			bool type              : 1;
			bool no_generic_params : 1;
		};
	};

	constexpr mangle_flags( unsigned int val ) : val(val) {}
};

using Mode = bitfield<mangle_flags>;

/// Mangle declaration name.
std::string mangle( const ast::Node * decl, Mode mode = {} );

/// Most common mangle configuration for types.
static inline std::string mangleType( const ast::Node * type ) {
	return mangle( type, { NoOverrideable | Type } );
}

/// The substrings used in name mangling and demangling.
namespace Encoding {
	extern const std::string manglePrefix;
	extern const std::string basicTypes[];
	extern const std::map<int, std::string> qualifiers;

	extern const std::string void_t;
	extern const std::string zero;
	extern const std::string one;

	extern const std::string function;
	extern const std::string tuple;
	extern const std::string pointer;
	extern const std::string array;
	extern const std::string qualifiedTypeStart;
	extern const std::string qualifiedTypeEnd;

	extern const std::string forall;
	extern const std::string typeVariables[];

	extern const std::string struct_t;
	extern const std::string union_t;
	extern const std::string enum_t;
	extern const std::string type;

	extern const std::string autogen;
	extern const std::string intrinsic;
}

}

// Local Variables: //
// tab-width: 4 //
// mode: c++ //
// compile-command: "make install" //
// End: //