[libside.git] / include / side / trace.h

// SPDX-License-Identifier: MIT
/*
 * Copyright 2022 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#ifndef _SIDE_TRACE_H
#define _SIDE_TRACE_H

#include <stdint.h>
#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <stdbool.h>
#include <stddef.h>
#include <side/macros.h>
#include <side/endian.h>

/*
 * SIDE stands for "Software Instrumentation Dynamically Enabled"
 *
 * This is an instrumentation ABI for Linux user-space, which exposes an
 * instrumentation type system and facilities allowing a kernel or
 * user-space tracer to consume user-space instrumentation.
 *
 * This instrumentation ABI exposes 3 type systems:
 *
 * * Stack-copy type system: This is the core type system which can
 *   represent all supported types and into which all other type systems
 *   can be nested. This type system requires that every type is
 *   statically or dynamically declared and then registered, thus giving
 *   tracers a complete description of the events and their associated
 *   fields before the associated instrumentation is invoked. The
 *   application needs to copy each argument (side_arg_...()) onto the
 *   stack when calling the instrumentation.
 *
 *   This is the most expressive of the 3 type systems, althrough not the
 *   fastest due to the extra copy of the arguments.
 *
 * * Data-gathering type system: This type system requires every type to
 *   be statically or dynamically declared and registered, but does not
 *   require the application to copy its arguments onto the stack.
 *   Instead, the type description contains all the required information
 *   to fetch the data from the application memory. The only argument
 *   required from the instrumentation is the base pointer from which
 *   the data should be fetched.
 *
 *   This type system can be used as an event field, or nested within
 *   the stack-copy type system. Nesting of gather-vla within
 *   gather-array and gather-vla types is not allowed.
 *
 *   This type system is has the least overhead of the 3 type systems.
 *
 * * Dynamic type system: This type system receives both type
 *   description and actual data onto the stack at runtime. It has more
 *   overhead that the 2 other type systems, but does not require a
 *   prior registration of event field description. This makes it useful
 *   for seldom used types which are not performance critical, but for
 *   which registering each individual events would needlessly grow the
 *   number of events to declare and register.
 *
 *   Another use-case for this type system is for use by dynamically
 *   typed language runtimes, where the field type is only known when
 *   the instrumentation is called.
 *
 *   Those dynamic types can be either used as arguments to a variadic
 *   field list, or as on-stack instrumentation argument for a static
 *   type SIDE_TYPE_DYNAMIC place holder in the stack-copy type system.
 *
 * The extensibility scheme for the SIDE ABI is as follows:
 *
 * * Existing field types are never changed nor extended. Field types
 *   can be added to the ABI by reserving a label within
 *   enum side_type_label.
 * * Existing attribute types are never changed nor extended. Attribute
 *   types can be added to the ABI by reserving a label within
 *   enum side_attr_type.
 * * Each union part of the ABI has an explicit side defined by a
 *   side_padding() member. Each structure and union have a static
 *   assert validating its size.
 *
 * Handling of unknown types by the tracers:
 *
 * * A tracer may choose to support only a subset of the types supported
 *   by libside. When encountering an unknown or unsupported type, the
 *   tracer has the option to either disallow the entire event or skip
 *   over the unknown type, both at event registration and when
 *   receiving the side_call arguments.
 *
 * * Event descriptions can be extended by adding fields at the end of
 *   the structure. The "struct side_event_description" is therefore a
 *   structure with flexible size and must not be used within arrays.
 */

#define SIDE_ABI_VERSION        0

struct side_arg;
struct side_arg_vec;
union side_arg_dynamic;
struct side_arg_dynamic_field;
struct side_arg_dynamic_vla;
struct side_type;
struct side_event_field;
struct side_tracer_visitor_ctx;
struct side_tracer_dynamic_struct_visitor_ctx;
struct side_event_description;
struct side_arg_dynamic_struct;
struct side_events_register_handle;
struct side_arg_variant;
struct side_event_state;
struct side_callback;

enum side_type_label {
        /* Stack-copy basic types */
        SIDE_TYPE_NULL,
        SIDE_TYPE_BOOL,
        SIDE_TYPE_U8,
        SIDE_TYPE_U16,
        SIDE_TYPE_U32,
        SIDE_TYPE_U64,
        SIDE_TYPE_S8,
        SIDE_TYPE_S16,
        SIDE_TYPE_S32,
        SIDE_TYPE_S64,
        SIDE_TYPE_BYTE,
        SIDE_TYPE_POINTER,
        SIDE_TYPE_FLOAT_BINARY16,
        SIDE_TYPE_FLOAT_BINARY32,
        SIDE_TYPE_FLOAT_BINARY64,
        SIDE_TYPE_FLOAT_BINARY128,
        SIDE_TYPE_STRING_UTF8,
        SIDE_TYPE_STRING_UTF16,
        SIDE_TYPE_STRING_UTF32,

        /* Stack-copy compound types */
        SIDE_TYPE_STRUCT,
        SIDE_TYPE_VARIANT,
        SIDE_TYPE_ARRAY,
        SIDE_TYPE_VLA,
        SIDE_TYPE_VLA_VISITOR,

        /* Stack-copy enumeration types */
        SIDE_TYPE_ENUM,
        SIDE_TYPE_ENUM_BITMAP,

        /* Stack-copy place holder for dynamic types */
        SIDE_TYPE_DYNAMIC,

        /* Gather basic types */
        SIDE_TYPE_GATHER_BOOL,
        SIDE_TYPE_GATHER_INTEGER,
        SIDE_TYPE_GATHER_BYTE,
        SIDE_TYPE_GATHER_POINTER,
        SIDE_TYPE_GATHER_FLOAT,
        SIDE_TYPE_GATHER_STRING,

        /* Gather compound types */
        SIDE_TYPE_GATHER_STRUCT,
        SIDE_TYPE_GATHER_ARRAY,
        SIDE_TYPE_GATHER_VLA,

        /* Gather enumeration types */
        SIDE_TYPE_GATHER_ENUM,

        /* Dynamic basic types */
        SIDE_TYPE_DYNAMIC_NULL,
        SIDE_TYPE_DYNAMIC_BOOL,
        SIDE_TYPE_DYNAMIC_INTEGER,
        SIDE_TYPE_DYNAMIC_BYTE,
        SIDE_TYPE_DYNAMIC_POINTER,
        SIDE_TYPE_DYNAMIC_FLOAT,
        SIDE_TYPE_DYNAMIC_STRING,

        /* Dynamic compound types */
        SIDE_TYPE_DYNAMIC_STRUCT,
        SIDE_TYPE_DYNAMIC_STRUCT_VISITOR,
        SIDE_TYPE_DYNAMIC_VLA,
        SIDE_TYPE_DYNAMIC_VLA_VISITOR,

        _NR_SIDE_TYPE_LABEL,    /* Last entry. */
};

enum side_attr_type {
        SIDE_ATTR_TYPE_NULL,
        SIDE_ATTR_TYPE_BOOL,
        SIDE_ATTR_TYPE_U8,
        SIDE_ATTR_TYPE_U16,
        SIDE_ATTR_TYPE_U32,
        SIDE_ATTR_TYPE_U64,
        SIDE_ATTR_TYPE_S8,
        SIDE_ATTR_TYPE_S16,
        SIDE_ATTR_TYPE_S32,
        SIDE_ATTR_TYPE_S64,
        SIDE_ATTR_TYPE_FLOAT_BINARY16,
        SIDE_ATTR_TYPE_FLOAT_BINARY32,
        SIDE_ATTR_TYPE_FLOAT_BINARY64,
        SIDE_ATTR_TYPE_FLOAT_BINARY128,
        SIDE_ATTR_TYPE_STRING,

        _NR_SIDE_ATTR_TYPE,     /* Last entry. */
};

enum side_loglevel {
        SIDE_LOGLEVEL_EMERG = 0,
        SIDE_LOGLEVEL_ALERT = 1,
        SIDE_LOGLEVEL_CRIT = 2,
        SIDE_LOGLEVEL_ERR = 3,
        SIDE_LOGLEVEL_WARNING = 4,
        SIDE_LOGLEVEL_NOTICE = 5,
        SIDE_LOGLEVEL_INFO = 6,
        SIDE_LOGLEVEL_DEBUG = 7,
};

enum side_visitor_status {
        SIDE_VISITOR_STATUS_OK = 0,
        SIDE_VISITOR_STATUS_ERROR = -1,
};

enum side_error {
        SIDE_ERROR_OK = 0,
        SIDE_ERROR_INVAL = 1,
        SIDE_ERROR_EXIST = 2,
        SIDE_ERROR_NOMEM = 3,
        SIDE_ERROR_NOENT = 4,
        SIDE_ERROR_EXITING = 5,
};

enum side_type_label_byte_order {
        SIDE_TYPE_BYTE_ORDER_LE = 0,
        SIDE_TYPE_BYTE_ORDER_BE = 1,
};

#if (SIDE_BYTE_ORDER == SIDE_LITTLE_ENDIAN)
# define SIDE_TYPE_BYTE_ORDER_HOST              SIDE_TYPE_BYTE_ORDER_LE
#else
# define SIDE_TYPE_BYTE_ORDER_HOST              SIDE_TYPE_BYTE_ORDER_BE
#endif

#if (SIDE_FLOAT_WORD_ORDER == SIDE_LITTLE_ENDIAN)
# define SIDE_TYPE_FLOAT_WORD_ORDER_HOST        SIDE_TYPE_BYTE_ORDER_LE
#else
# define SIDE_TYPE_FLOAT_WORD_ORDER_HOST        SIDE_TYPE_BYTE_ORDER_BE
#endif

enum side_type_gather_access_mode {
        SIDE_TYPE_GATHER_ACCESS_DIRECT,
        SIDE_TYPE_GATHER_ACCESS_POINTER,        /* Pointer dereference */
};

typedef enum side_visitor_status (*side_visitor_func)(
                const struct side_tracer_visitor_ctx *tracer_ctx,
                void *app_ctx);
typedef enum side_visitor_status (*side_dynamic_struct_visitor_func)(
                const struct side_tracer_dynamic_struct_visitor_ctx *tracer_ctx,
                void *app_ctx);
typedef enum side_visitor_status (*side_write_elem_func)(
                const struct side_tracer_visitor_ctx *tracer_ctx,
                const struct side_arg *elem);
typedef enum side_visitor_status (*side_write_field_func)(
                const struct side_tracer_dynamic_struct_visitor_ctx *tracer_ctx,
                const struct side_arg_dynamic_field *dynamic_field);

union side_integer_value {
        uint8_t side_u8;
        uint16_t side_u16;
        uint32_t side_u32;
        uint64_t side_u64;
        int8_t side_s8;
        int16_t side_s16;
        int32_t side_s32;
        int64_t side_s64;
        uintptr_t side_uptr;
        side_padding(32);
} SIDE_PACKED;
side_check_size(union side_integer_value, 32);

union side_bool_value {
        uint8_t side_bool8;
        uint16_t side_bool16;
        uint32_t side_bool32;
        uint64_t side_bool64;
        side_padding(32);
} SIDE_PACKED;
side_check_size(union side_bool_value, 32);

union side_float_value {
#if __HAVE_FLOAT16
        _Float16 side_float_binary16;
#endif
#if __HAVE_FLOAT32
        _Float32 side_float_binary32;
#endif
#if __HAVE_FLOAT64
        _Float64 side_float_binary64;
#endif
#if __HAVE_FLOAT128
        _Float128 side_float_binary128;
#endif
        side_padding(32);
} SIDE_PACKED;
side_check_size(union side_float_value, 32);

struct side_type_raw_string {
        side_ptr_t(const void) p;       /* pointer to string */
        uint8_t unit_size;              /* 1, 2, or 4 bytes */
        side_enum_t(enum side_type_label_byte_order, uint8_t) byte_order;
} SIDE_PACKED;
side_check_size(struct side_type_raw_string, 18);

struct side_attr_value {
        side_enum_t(enum side_attr_type, uint32_t) type;
        union {
                uint8_t bool_value;
                struct side_type_raw_string string_value;
                union side_integer_value integer_value;
                union side_float_value float_value;
                side_padding(32);
        } SIDE_PACKED u;
};
side_check_size(struct side_attr_value, 36);

/* User attributes. */
struct side_attr {
        const struct side_type_raw_string key;
        const struct side_attr_value value;
} SIDE_PACKED;
side_check_size(struct side_attr, 54);

/* Type descriptions */
struct side_type_null {
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_attr;
} SIDE_PACKED;
side_check_size(struct side_type_null, 20);

struct side_type_bool {
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_attr;
        uint16_t bool_size;             /* bytes */
        uint16_t len_bits;              /* bits. 0 for (bool_size * CHAR_BITS) */
        side_enum_t(enum side_type_label_byte_order, uint8_t) byte_order;
} SIDE_PACKED;
side_check_size(struct side_type_bool, 25);

struct side_type_byte {
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_attr;
} SIDE_PACKED;
side_check_size(struct side_type_byte, 20);

struct side_type_string {
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_attr;
        uint8_t unit_size;              /* 1, 2, or 4 bytes */
        side_enum_t(enum side_type_label_byte_order, uint8_t) byte_order;
} SIDE_PACKED;
side_check_size(struct side_type_string, 22);

struct side_type_integer {
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_attr;
        uint16_t integer_size;          /* bytes */
        uint16_t len_bits;              /* bits. 0 for (integer_size * CHAR_BITS) */
        uint8_t signedness;             /* true/false */
        side_enum_t(enum side_type_label_byte_order, uint8_t) byte_order;
} SIDE_PACKED;
side_check_size(struct side_type_integer, 26);

struct side_type_float {
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_attr;
        uint16_t float_size;            /* bytes */
        side_enum_t(enum side_type_label_byte_order, uint8_t) byte_order;
} SIDE_PACKED;
side_check_size(struct side_type_float, 23);

struct side_enum_mapping {
        int64_t range_begin;
        int64_t range_end;
        struct side_type_raw_string label;
} SIDE_PACKED;
side_check_size(struct side_enum_mapping, 16 + sizeof(struct side_type_raw_string));

struct side_enum_mappings {
        side_ptr_t(const struct side_enum_mapping) mappings;
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_mappings;
        uint32_t nr_attr;
} SIDE_PACKED;
side_check_size(struct side_enum_mappings, 40);

struct side_enum_bitmap_mapping {
        uint64_t range_begin;
        uint64_t range_end;
        struct side_type_raw_string label;
} SIDE_PACKED;
side_check_size(struct side_enum_bitmap_mapping, 16 + sizeof(struct side_type_raw_string));

struct side_enum_bitmap_mappings {
        side_ptr_t(const struct side_enum_bitmap_mapping) mappings;
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_mappings;
        uint32_t nr_attr;
} SIDE_PACKED;
side_check_size(struct side_enum_bitmap_mappings, 40);

struct side_type_struct {
        side_ptr_t(const struct side_event_field) fields;
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_fields;
        uint32_t nr_attr;
} SIDE_PACKED;
side_check_size(struct side_type_struct, 40);

struct side_type_array {
        side_ptr_t(const struct side_type) elem_type;
        side_ptr_t(const struct side_attr) attr;
        uint32_t length;
        uint32_t nr_attr;
} SIDE_PACKED;
side_check_size(struct side_type_array, 40);

struct side_type_vla {
        side_ptr_t(const struct side_type) elem_type;
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_attr;
} SIDE_PACKED;
side_check_size(struct side_type_vla, 36);

struct side_type_vla_visitor {
        side_ptr_t(const struct side_type) elem_type;
        side_func_ptr_t(side_visitor_func) visitor;
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_attr;
} SIDE_PACKED;
side_check_size(struct side_type_vla_visitor, 52);

struct side_type_enum {
        side_ptr_t(const struct side_enum_mappings) mappings;
        side_ptr_t(const struct side_type) elem_type;
} SIDE_PACKED;
side_check_size(struct side_type_enum, 32);

struct side_type_enum_bitmap {
        side_ptr_t(const struct side_enum_bitmap_mappings) mappings;
        side_ptr_t(const struct side_type) elem_type;
} SIDE_PACKED;
side_check_size(struct side_type_enum_bitmap, 32);

struct side_type_gather_bool {
        uint64_t offset;        /* bytes */
        uint16_t offset_bits;   /* bits */
        uint8_t access_mode;    /* enum side_type_gather_access_mode */
        struct side_type_bool type;
} SIDE_PACKED;
side_check_size(struct side_type_gather_bool, 11 + sizeof(struct side_type_bool));

struct side_type_gather_byte {
        uint64_t offset;        /* bytes */
        uint8_t access_mode;    /* enum side_type_gather_access_mode */
        struct side_type_byte type;
} SIDE_PACKED;
side_check_size(struct side_type_gather_byte, 9 + sizeof(struct side_type_byte));

struct side_type_gather_integer {
        uint64_t offset;        /* bytes */
        uint16_t offset_bits;   /* bits */
        uint8_t access_mode;    /* enum side_type_gather_access_mode */
        struct side_type_integer type;
} SIDE_PACKED;
side_check_size(struct side_type_gather_integer, 11 + sizeof(struct side_type_integer));

struct side_type_gather_float {
        uint64_t offset;        /* bytes */
        uint8_t access_mode;    /* enum side_type_gather_access_mode */
        struct side_type_float type;
} SIDE_PACKED;
side_check_size(struct side_type_gather_float, 9 + sizeof(struct side_type_float));

struct side_type_gather_string {
        uint64_t offset;        /* bytes */
        uint8_t access_mode;    /* enum side_type_gather_access_mode */
        struct side_type_string type;
} SIDE_PACKED;
side_check_size(struct side_type_gather_string, 9 + sizeof(struct side_type_string));

struct side_type_gather_enum {
        side_ptr_t(const struct side_enum_mappings) mappings;
        side_ptr_t(const struct side_type) elem_type;
} SIDE_PACKED;
side_check_size(struct side_type_gather_enum, 32);

struct side_type_gather_struct {
        side_ptr_t(const struct side_type_struct) type;
        uint64_t offset;        /* bytes */
        uint8_t access_mode;    /* enum side_type_gather_access_mode */
        uint32_t size;          /* bytes */
} SIDE_PACKED;
side_check_size(struct side_type_gather_struct, 29);

struct side_type_gather_array {
        uint64_t offset;        /* bytes */
        uint8_t access_mode;    /* enum side_type_gather_access_mode */
        struct side_type_array type;
} SIDE_PACKED;
side_check_size(struct side_type_gather_array, 9 + sizeof(struct side_type_array));

struct side_type_gather_vla {
        side_ptr_t(const struct side_type) length_type; /* side_length() */
        uint64_t offset;        /* bytes */
        uint8_t access_mode;    /* enum side_type_gather_access_mode */
        struct side_type_vla type;
} SIDE_PACKED;
side_check_size(struct side_type_gather_vla, 25 + sizeof(struct side_type_vla));

struct side_type_gather {
        union {
                struct side_type_gather_bool side_bool;
                struct side_type_gather_byte side_byte;
                struct side_type_gather_integer side_integer;
                struct side_type_gather_float side_float;
                struct side_type_gather_string side_string;
                struct side_type_gather_enum side_enum;
                struct side_type_gather_array side_array;
                struct side_type_gather_vla side_vla;
                struct side_type_gather_struct side_struct;
                side_padding(61);
        } SIDE_PACKED u;
} SIDE_PACKED;
side_check_size(struct side_type_gather, 61);

struct side_type {
        side_enum_t(enum side_type_label, uint16_t) type;
        union {
                /* Stack-copy basic types */
                struct side_type_null side_null;
                struct side_type_bool side_bool;
                struct side_type_byte side_byte;
                struct side_type_string side_string;
                struct side_type_integer side_integer;
                struct side_type_float side_float;

                /* Stack-copy compound types */
                struct side_type_array side_array;
                struct side_type_vla side_vla;
                struct side_type_vla_visitor side_vla_visitor;
                side_ptr_t(const struct side_type_struct) side_struct;
                side_ptr_t(const struct side_type_variant) side_variant;

                /* Stack-copy enumeration types */
                struct side_type_enum side_enum;
                struct side_type_enum_bitmap side_enum_bitmap;

                /* Gather types */
                struct side_type_gather side_gather;
                side_padding(62);
        } SIDE_PACKED u;
} SIDE_PACKED;
side_check_size(struct side_type, 64);

struct side_variant_option {
        int64_t range_begin;
        int64_t range_end;
        const struct side_type side_type;
} SIDE_PACKED;
side_check_size(struct side_variant_option, 16 + sizeof(const struct side_type));

struct side_type_variant {
        side_ptr_t(const struct side_variant_option) options;
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_options;
        uint32_t nr_attr;
        const struct side_type selector;
} SIDE_PACKED;
side_check_size(struct side_type_variant, 40 + sizeof(const struct side_type));

struct side_event_field {
        side_ptr_t(const char) field_name;
        struct side_type side_type;
} SIDE_PACKED;
side_check_size(struct side_event_field, 16 + sizeof(struct side_type));

enum side_event_flags {
        SIDE_EVENT_FLAG_VARIADIC = (1 << 0),
};

union side_arg_static {
        /* Stack-copy basic types */
        union side_bool_value bool_value;
        uint8_t byte_value;
        side_ptr_t(const void) string_value;    /* const {uint8_t, uint16_t, uint32_t} * */
        union side_integer_value integer_value;
        union side_float_value float_value;

        /* Stack-copy compound types */
        side_ptr_t(const struct side_arg_vec) side_struct;
        side_ptr_t(const struct side_arg_variant) side_variant;
        side_ptr_t(const struct side_arg_vec) side_array;
        side_ptr_t(const struct side_arg_vec) side_vla;
        void *side_vla_app_visitor_ctx;

        /* Gather basic types */
        side_ptr_t(const void) side_bool_gather_ptr;
        side_ptr_t(const void) side_byte_gather_ptr;
        side_ptr_t(const void) side_integer_gather_ptr;
        side_ptr_t(const void) side_float_gather_ptr;
        side_ptr_t(const void) side_string_gather_ptr;

        /* Gather compound types */
        side_ptr_t(const void) side_array_gather_ptr;
        side_ptr_t(const void) side_struct_gather_ptr;
        struct {
                side_ptr_t(const void) ptr;
                side_ptr_t(const void) length_ptr;
        } SIDE_PACKED side_vla_gather;
        side_padding(32);
} SIDE_PACKED;
side_check_size(union side_arg_static, 32);

struct side_arg_dynamic_vla {
        side_ptr_t(const struct side_arg) sav;
        side_ptr_t(const struct side_attr) attr;
        uint32_t len;
        uint32_t nr_attr;
} SIDE_PACKED;
side_check_size(struct side_arg_dynamic_vla, 40);

struct side_arg_dynamic_struct {
        side_ptr_t(const struct side_arg_dynamic_field) fields;
        side_ptr_t(const struct side_attr) attr;
        uint32_t len;
        uint32_t nr_attr;
} SIDE_PACKED;
side_check_size(struct side_arg_dynamic_struct, 40);

struct side_dynamic_struct_visitor {
        side_func_ptr_t(side_dynamic_struct_visitor_func) visitor;
        side_ptr_t(void) app_ctx;
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_attr;
} SIDE_PACKED;
side_check_size(struct side_dynamic_struct_visitor, 52);

struct side_dynamic_vla_visitor {
        side_func_ptr_t(side_visitor_func) visitor;
        side_ptr_t(void) app_ctx;
        side_ptr_t(const struct side_attr) attr;
        uint32_t nr_attr;
} SIDE_PACKED;
side_check_size(struct side_dynamic_vla_visitor, 52);

union side_arg_dynamic {
        /* Dynamic basic types */
        struct side_type_null side_null;
        struct {
                struct side_type_bool type;
                union side_bool_value value;
        } SIDE_PACKED side_bool;
        struct {
                struct side_type_byte type;
                uint8_t value;
        } SIDE_PACKED side_byte;
        struct {
                struct side_type_string type;
                uint64_t value; /* const char * */
        } SIDE_PACKED side_string;
        struct {
                struct side_type_integer type;
                union side_integer_value value;
        } SIDE_PACKED side_integer;
        struct {
                struct side_type_float type;
                union side_float_value value;
        } SIDE_PACKED side_float;

        /* Dynamic compound types */
        side_ptr_t(const struct side_arg_dynamic_struct) side_dynamic_struct;
        side_ptr_t(const struct side_arg_dynamic_vla) side_dynamic_vla;

        struct side_dynamic_struct_visitor side_dynamic_struct_visitor;
        struct side_dynamic_vla_visitor side_dynamic_vla_visitor;

        side_padding(58);
} SIDE_PACKED;
side_check_size(union side_arg_dynamic, 58);

struct side_arg {
        side_enum_t(enum side_type_label, uint16_t) type;
        union {
                union side_arg_static side_static;
                union side_arg_dynamic side_dynamic;
                side_padding(62);
        } SIDE_PACKED u;
} SIDE_PACKED;
side_check_size(struct side_arg, 64);

struct side_arg_variant {
        struct side_arg selector;
        struct side_arg option;
} SIDE_PACKED;
side_check_size(struct side_arg_variant, 128);

struct side_arg_vec {
        side_ptr_t(const struct side_arg) sav;
        uint32_t len;
} SIDE_PACKED;
side_check_size(struct side_arg_vec, 20);

struct side_arg_dynamic_field {
        side_ptr_t(const char) field_name;
        const struct side_arg elem;
} SIDE_PACKED;
side_check_size(struct side_arg_dynamic_field, 16 + sizeof(const struct side_arg));

struct side_event_description {
        uint32_t struct_size;   /* Size of this structure. */
        uint32_t version;       /* ABI version. */

        side_ptr_t(struct side_event_state) state;
        side_ptr_t(const char) provider_name;
        side_ptr_t(const char) event_name;
        side_ptr_t(const struct side_event_field) fields;
        side_ptr_t(const struct side_attr) attr;
        uint64_t flags;
        uint16_t nr_side_type_label;
        uint16_t nr_side_attr_type;
        side_enum_t(enum side_loglevel, uint32_t) loglevel;
        uint32_t nr_fields;
        uint32_t nr_attr;
        uint32_t nr_callbacks;
#define side_event_description_orig_abi_last    nr_callbacks
        /* End of fields supported in the original ABI. */

        char end[];     /* End with a flexible array to account for extensibility. */
} SIDE_PACKED;

/*
 * This structure is _not_ packed to allow atomic operations on its
 * fields.
 */
struct side_event_state {
        uintptr_t enabled;
        const struct side_callback *callbacks;
        struct side_event_description *desc;
};

/* Event and type attributes */

#define side_attr(_key, _value) \
        { \
                .key = { \
                        .p = SIDE_PTR_INIT(_key), \
                        .unit_size = sizeof(uint8_t), \
                        .byte_order = SIDE_ENUM_INIT(SIDE_TYPE_BYTE_ORDER_HOST), \
                }, \
                .value = SIDE_PARAM(_value), \
        }

#define side_attr_list(...) \
        SIDE_COMPOUND_LITERAL(const struct side_attr, __VA_ARGS__)

#define side_attr_null(_val)            { .type = SIDE_ATTR_TYPE_NULL }
#define side_attr_bool(_val)            { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_BOOL), .u = { .bool_value = !!(_val) } }
#define side_attr_u8(_val)              { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_U8), .u = { .integer_value = { .side_u8 = (_val) } } }
#define side_attr_u16(_val)             { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_U16), .u = { .integer_value = { .side_u16 = (_val) } } }
#define side_attr_u32(_val)             { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_U32), .u = { .integer_value = { .side_u32 = (_val) } } }
#define side_attr_u64(_val)             { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_U64), .u = { .integer_value = { .side_u64 = (_val) } } }
#define side_attr_s8(_val)              { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_S8), .u = { .integer_value = { .side_s8 = (_val) } } }
#define side_attr_s16(_val)             { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_S16), .u = { .integer_value = { .side_s16 = (_val) } } }
#define side_attr_s32(_val)             { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_S32), .u = { .integer_value = { .side_s32 = (_val) } } }
#define side_attr_s64(_val)             { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_S64), .u = { .integer_value = { .side_s64 = (_val) } } }
#define side_attr_float_binary16(_val)  { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_FLOAT_BINARY16), .u = { .float_value = { .side_float_binary16 = (_val) } } }
#define side_attr_float_binary32(_val)  { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_FLOAT_BINARY32), .u = { .float_value = { .side_float_binary32 = (_val) } } }
#define side_attr_float_binary64(_val)  { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_FLOAT_BINARY64), .u = { .float_value = { .side_float_binary64 = (_val) } } }
#define side_attr_float_binary128(_val) { .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_FLOAT_BINARY128), .u = { .float_value = { .side_float_binary128 = (_val) } } }

#define _side_attr_string(_val, _byte_order, _unit_size) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_ATTR_TYPE_STRING), \
                .u = { \
                        .string_value = { \
                                .p = SIDE_PTR_INIT(_val), \
                                .unit_size = _unit_size, \
                                .byte_order = SIDE_ENUM_INIT(_byte_order), \
                        }, \
                }, \
        }

#define side_attr_string(_val)          _side_attr_string(_val, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint8_t))
#define side_attr_string16(_val)        _side_attr_string(_val, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint16_t))
#define side_attr_string32(_val)        _side_attr_string(_val, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint32_t))

/* Stack-copy enumeration type definitions */

#define side_define_enum(_identifier, _mappings, _attr...) \
        const struct side_enum_mappings _identifier = { \
                .mappings = SIDE_PTR_INIT(_mappings), \
                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                .nr_mappings = SIDE_ARRAY_SIZE(SIDE_PARAM(_mappings)), \
                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
        }

#define side_enum_mapping_list(...) \
        SIDE_COMPOUND_LITERAL(const struct side_enum_mapping, __VA_ARGS__)

#define side_enum_mapping_range(_label, _begin, _end) \
        { \
                .range_begin = _begin, \
                .range_end = _end, \
                .label = { \
                        .p = SIDE_PTR_INIT(_label), \
                        .unit_size = sizeof(uint8_t), \
                        .byte_order = SIDE_ENUM_INIT(SIDE_TYPE_BYTE_ORDER_HOST), \
                }, \
        }

#define side_enum_mapping_value(_label, _value) \
        { \
                .range_begin = _value, \
                .range_end = _value, \
                .label = { \
                        .p = SIDE_PTR_INIT(_label), \
                        .unit_size = sizeof(uint8_t), \
                        .byte_order = SIDE_ENUM_INIT(SIDE_TYPE_BYTE_ORDER_HOST), \
                }, \
        }

#define side_define_enum_bitmap(_identifier, _mappings, _attr...) \
        const struct side_enum_bitmap_mappings _identifier = { \
                .mappings = SIDE_PTR_INIT(_mappings), \
                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                .nr_mappings = SIDE_ARRAY_SIZE(SIDE_PARAM(_mappings)), \
                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
        }

#define side_enum_bitmap_mapping_list(...) \
        SIDE_COMPOUND_LITERAL(const struct side_enum_bitmap_mapping, __VA_ARGS__)

#define side_enum_bitmap_mapping_range(_label, _begin, _end) \
        { \
                .range_begin = _begin, \
                .range_end = _end, \
                .label = { \
                        .p = SIDE_PTR_INIT(_label), \
                        .unit_size = sizeof(uint8_t), \
                        .byte_order = SIDE_ENUM_INIT(SIDE_TYPE_BYTE_ORDER_HOST), \
                }, \
        }

#define side_enum_bitmap_mapping_value(_label, _value) \
        { \
                .range_begin = _value, \
                .range_end = _value, \
                .label = { \
                        .p = SIDE_PTR_INIT(_label), \
                        .unit_size = sizeof(uint8_t), \
                        .byte_order = SIDE_ENUM_INIT(SIDE_TYPE_BYTE_ORDER_HOST), \
                }, \
        }

/* Stack-copy field and type definitions */

#define side_type_null(_attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_NULL), \
                .u = { \
                        .side_null = { \
                                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                        }, \
                }, \
        }

#define side_type_bool(_attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_BOOL), \
                .u = { \
                        .side_bool = { \
                                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                .bool_size = sizeof(uint8_t), \
                                .len_bits = 0, \
                                .byte_order = SIDE_ENUM_INIT(SIDE_TYPE_BYTE_ORDER_HOST), \
                        }, \
                }, \
        }

#define side_type_byte(_attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_BYTE), \
                .u = { \
                        .side_byte = { \
                                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                        }, \
                }, \
        }

#define _side_type_string(_type, _byte_order, _unit_size, _attr) \
        { \
                .type = SIDE_ENUM_INIT(_type), \
                .u = { \
                        .side_string = { \
                                .attr = SIDE_PTR_INIT(_attr), \
                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM(_attr)), \
                                .unit_size = _unit_size, \
                                .byte_order = SIDE_ENUM_INIT(_byte_order), \
                        }, \
                }, \
        }

#define side_type_dynamic() \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_DYNAMIC), \
        }

#define _side_type_integer(_type, _signedness, _byte_order, _integer_size, _len_bits, _attr) \
        { \
                .type = SIDE_ENUM_INIT(_type), \
                .u = { \
                        .side_integer = { \
                                .attr = SIDE_PTR_INIT(_attr), \
                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM(_attr)), \
                                .integer_size = _integer_size, \
                                .len_bits = _len_bits, \
                                .signedness = _signedness, \
                                .byte_order = SIDE_ENUM_INIT(_byte_order), \
                        }, \
                }, \
        }

#define _side_type_float(_type, _byte_order, _float_size, _attr) \
        { \
                .type = SIDE_ENUM_INIT(_type), \
                .u = { \
                        .side_float = { \
                                .attr = SIDE_PTR_INIT(_attr), \
                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM(_attr)), \
                                .float_size = _float_size, \
                                .byte_order = SIDE_ENUM_INIT(_byte_order), \
                        }, \
                }, \
        }

#define _side_field(_name, _type) \
        { \
                .field_name = SIDE_PTR_INIT(_name), \
                .side_type = _type, \
        }

#define side_option_range(_range_begin, _range_end, _type) \
        { \
                .range_begin = _range_begin, \
                .range_end = _range_end, \
                .side_type = _type, \
        }

#define side_option(_value, _type) \
        side_option_range(_value, _value, SIDE_PARAM(_type))

/* Host endian */
#define side_type_u8(_attr...)                          _side_type_integer(SIDE_TYPE_U8, false, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint8_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_u16(_attr...)                         _side_type_integer(SIDE_TYPE_U16, false, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint16_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_u32(_attr...)                         _side_type_integer(SIDE_TYPE_U32, false, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint32_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_u64(_attr...)                         _side_type_integer(SIDE_TYPE_U64, false, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint64_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_s8(_attr...)                          _side_type_integer(SIDE_TYPE_S8, true, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(int8_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_s16(_attr...)                         _side_type_integer(SIDE_TYPE_S16, true, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(int16_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_s32(_attr...)                         _side_type_integer(SIDE_TYPE_S32, true, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(int32_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_s64(_attr...)                         _side_type_integer(SIDE_TYPE_S64, true, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(int64_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_pointer(_attr...)                     _side_type_integer(SIDE_TYPE_POINTER, false, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uintptr_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_float_binary16(_attr...)              _side_type_float(SIDE_TYPE_FLOAT_BINARY16, SIDE_TYPE_FLOAT_WORD_ORDER_HOST, sizeof(_Float16), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_float_binary32(_attr...)              _side_type_float(SIDE_TYPE_FLOAT_BINARY32, SIDE_TYPE_FLOAT_WORD_ORDER_HOST, sizeof(_Float32), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_float_binary64(_attr...)              _side_type_float(SIDE_TYPE_FLOAT_BINARY64, SIDE_TYPE_FLOAT_WORD_ORDER_HOST, sizeof(_Float64), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_float_binary128(_attr...)             _side_type_float(SIDE_TYPE_FLOAT_BINARY128, SIDE_TYPE_FLOAT_WORD_ORDER_HOST, sizeof(_Float128), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_string(_attr...)                      _side_type_string(SIDE_TYPE_STRING_UTF8, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint8_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_string16(_attr...)                    _side_type_string(SIDE_TYPE_STRING_UTF16, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint16_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_string32(_attr...)                    _side_type_string(SIDE_TYPE_STRING_UTF32, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint32_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_field_null(_name, _attr...)                _side_field(_name, side_type_null(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_bool(_name, _attr...)                _side_field(_name, side_type_bool(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_u8(_name, _attr...)                  _side_field(_name, side_type_u8(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_u16(_name, _attr...)                 _side_field(_name, side_type_u16(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_u32(_name, _attr...)                 _side_field(_name, side_type_u32(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_u64(_name, _attr...)                 _side_field(_name, side_type_u64(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_s8(_name, _attr...)                  _side_field(_name, side_type_s8(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_s16(_name, _attr...)                 _side_field(_name, side_type_s16(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_s32(_name, _attr...)                 _side_field(_name, side_type_s32(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_s64(_name, _attr...)                 _side_field(_name, side_type_s64(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_byte(_name, _attr...)                _side_field(_name, side_type_byte(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_pointer(_name, _attr...)             _side_field(_name, side_type_pointer(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_float_binary16(_name, _attr...)      _side_field(_name, side_type_float_binary16(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_float_binary32(_name, _attr...)      _side_field(_name, side_type_float_binary32(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_float_binary64(_name, _attr...)      _side_field(_name, side_type_float_binary64(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_float_binary128(_name, _attr...)     _side_field(_name, side_type_float_binary128(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_string(_name, _attr...)              _side_field(_name, side_type_string(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_string16(_name, _attr...)            _side_field(_name, side_type_string16(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_string32(_name, _attr...)            _side_field(_name, side_type_string32(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_dynamic(_name)                       _side_field(_name, side_type_dynamic())

/* Little endian */
#define side_type_u16_le(_attr...)                      _side_type_integer(SIDE_TYPE_U16, false, SIDE_TYPE_BYTE_ORDER_LE, sizeof(uint16_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_u32_le(_attr...)                      _side_type_integer(SIDE_TYPE_U32, false, SIDE_TYPE_BYTE_ORDER_LE, sizeof(uint32_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_u64_le(_attr...)                      _side_type_integer(SIDE_TYPE_U64, false, SIDE_TYPE_BYTE_ORDER_LE, sizeof(uint64_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_s16_le(_attr...)                      _side_type_integer(SIDE_TYPE_S16, true, SIDE_TYPE_BYTE_ORDER_LE, sizeof(int16_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_s32_le(_attr...)                      _side_type_integer(SIDE_TYPE_S32, true, SIDE_TYPE_BYTE_ORDER_LE, sizeof(int32_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_s64_le(_attr...)                      _side_type_integer(SIDE_TYPE_S64, true, SIDE_TYPE_BYTE_ORDER_LE, sizeof(int64_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_pointer_le(_attr...)                  _side_type_integer(SIDE_TYPE_POINTER, false, SIDE_TYPE_BYTE_ORDER_LE, sizeof(uintptr_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_float_binary16_le(_attr...)           _side_type_float(SIDE_TYPE_FLOAT_BINARY16, SIDE_TYPE_BYTE_ORDER_LE, sizeof(_Float16), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_float_binary32_le(_attr...)           _side_type_float(SIDE_TYPE_FLOAT_BINARY32, SIDE_TYPE_BYTE_ORDER_LE, sizeof(_Float32), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_float_binary64_le(_attr...)           _side_type_float(SIDE_TYPE_FLOAT_BINARY64, SIDE_TYPE_BYTE_ORDER_LE, sizeof(_Float64), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_float_binary128_le(_attr...)          _side_type_float(SIDE_TYPE_FLOAT_BINARY128, SIDE_TYPE_BYTE_ORDER_LE, sizeof(_Float128), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_string16_le(_attr...)                 _side_type_string(SIDE_TYPE_STRING_UTF16, SIDE_TYPE_BYTE_ORDER_LE, sizeof(uint16_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_string32_le(_attr...)                 _side_type_string(SIDE_TYPE_STRING_UTF32, SIDE_TYPE_BYTE_ORDER_LE, sizeof(uint32_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_field_u16_le(_name, _attr...)              _side_field(_name, side_type_u16_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_u32_le(_name, _attr...)              _side_field(_name, side_type_u32_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_u64_le(_name, _attr...)              _side_field(_name, side_type_u64_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_s16_le(_name, _attr...)              _side_field(_name, side_type_s16_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_s32_le(_name, _attr...)              _side_field(_name, side_type_s32_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_s64_le(_name, _attr...)              _side_field(_name, side_type_s64_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_pointer_le(_name, _attr...)          _side_field(_name, side_type_pointer_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_float_binary16_le(_name, _attr...)   _side_field(_name, side_type_float_binary16_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_float_binary32_le(_name, _attr...)   _side_field(_name, side_type_float_binary32_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_float_binary64_le(_name, _attr...)   _side_field(_name, side_type_float_binary64_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_float_binary128_le(_name, _attr...)  _side_field(_name, side_type_float_binary128_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_string16_le(_name, _attr...)         _side_field(_name, side_type_string16_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_string32_le(_name, _attr...)         _side_field(_name, side_type_string32_le(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

/* Big endian */
#define side_type_u16_be(_attr...)                      _side_type_integer(SIDE_TYPE_U16, false, SIDE_TYPE_BYTE_ORDER_BE, sizeof(uint16_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_u32_be(_attr...)                      _side_type_integer(SIDE_TYPE_U32, false, SIDE_TYPE_BYTE_ORDER_BE, sizeof(uint32_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_u64_be(_attr...)                      _side_type_integer(SIDE_TYPE_U64, false, SIDE_TYPE_BYTE_ORDER_BE, sizeof(uint64_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_s16_be(_attr...)                      _side_type_integer(SIDE_TYPE_S16, false, SIDE_TYPE_BYTE_ORDER_BE, sizeof(int16_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_s32_be(_attr...)                      _side_type_integer(SIDE_TYPE_S32, false, SIDE_TYPE_BYTE_ORDER_BE, sizeof(int32_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_s64_be(_attr...)                      _side_type_integer(SIDE_TYPE_S64, false, SIDE_TYPE_BYTE_ORDER_BE, sizeof(int64_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_pointer_be(_attr...)                  _side_type_integer(SIDE_TYPE_POINTER, false, SIDE_TYPE_BYTE_ORDER_BE, sizeof(uintptr_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_float_binary16_be(_attr...)           _side_type_float(SIDE_TYPE_FLOAT_BINARY16, SIDE_TYPE_BYTE_ORDER_BE, sizeof(_Float16), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_float_binary32_be(_attr...)           _side_type_float(SIDE_TYPE_FLOAT_BINARY32, SIDE_TYPE_BYTE_ORDER_BE, sizeof(_Float32), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_float_binary64_be(_attr...)           _side_type_float(SIDE_TYPE_FLOAT_BINARY64, SIDE_TYPE_BYTE_ORDER_BE, sizeof(_Float64), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_float_binary128_be(_attr...)          _side_type_float(SIDE_TYPE_FLOAT_BINARY128, SIDE_TYPE_BYTE_ORDER_BE, sizeof(_Float128), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_string16_be(_attr...)                 _side_type_string(SIDE_TYPE_STRING_UTF16, SIDE_TYPE_BYTE_ORDER_BE, sizeof(uint16_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_string32_be(_attr...)                 _side_type_string(SIDE_TYPE_STRING_UTF32, SIDE_TYPE_BYTE_ORDER_BE, sizeof(uint32_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_field_u16_be(_name, _attr...)              _side_field(_name, side_type_u16_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_u32_be(_name, _attr...)              _side_field(_name, side_type_u32_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_u64_be(_name, _attr...)              _side_field(_name, side_type_u64_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_s16_be(_name, _attr...)              _side_field(_name, side_type_s16_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_s32_be(_name, _attr...)              _side_field(_name, side_type_s32_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_s64_be(_name, _attr...)              _side_field(_name, side_type_s64_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_pointer_be(_name, _attr...)          _side_field(_name, side_type_pointer_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_float_binary16_be(_name, _attr...)   _side_field(_name, side_type_float_binary16_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_float_binary32_be(_name, _attr...)   _side_field(_name, side_type_float_binary32_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_float_binary64_be(_name, _attr...)   _side_field(_name, side_type_float_binary64_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_float_binary128_be(_name, _attr...)  _side_field(_name, side_type_float_binary128_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_string16_be(_name, _attr...)         _side_field(_name, side_type_string16_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_string32_be(_name, _attr...)         _side_field(_name, side_type_string32_be(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_type_enum(_mappings, _elem_type) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_ENUM), \
                .u = { \
                        .side_enum = { \
                                .mappings = SIDE_PTR_INIT(_mappings), \
                                .elem_type = SIDE_PTR_INIT(_elem_type), \
                        }, \
                }, \
        }
#define side_field_enum(_name, _mappings, _elem_type) \
        _side_field(_name, side_type_enum(SIDE_PARAM(_mappings), SIDE_PARAM(_elem_type)))

#define side_type_enum_bitmap(_mappings, _elem_type) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_ENUM_BITMAP), \
                .u = { \
                        .side_enum_bitmap = { \
                                .mappings = SIDE_PTR_INIT(_mappings), \
                                .elem_type = SIDE_PTR_INIT(_elem_type), \
                        }, \
                }, \
        }
#define side_field_enum_bitmap(_name, _mappings, _elem_type) \
        _side_field(_name, side_type_enum_bitmap(SIDE_PARAM(_mappings), SIDE_PARAM(_elem_type)))

#define side_type_struct(_struct) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_STRUCT), \
                .u = { \
                        .side_struct = SIDE_PTR_INIT(_struct), \
                }, \
        }
#define side_field_struct(_name, _struct) \
        _side_field(_name, side_type_struct(SIDE_PARAM(_struct)))

#define _side_type_struct_define(_fields, _attr) \
        { \
                .fields = SIDE_PTR_INIT(_fields), \
                .attr = SIDE_PTR_INIT(_attr), \
                .nr_fields = SIDE_ARRAY_SIZE(SIDE_PARAM(_fields)), \
                .nr_attr  = SIDE_ARRAY_SIZE(SIDE_PARAM(_attr)), \
        }

#define side_define_struct(_identifier, _fields, _attr...) \
        const struct side_type_struct _identifier = _side_type_struct_define(SIDE_PARAM(_fields), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_struct_literal(_fields, _attr...) \
        SIDE_COMPOUND_LITERAL(const struct side_type_struct, \
                _side_type_struct_define(SIDE_PARAM(_fields), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_type_variant(_variant) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_VARIANT), \
                .u = { \
                        .side_variant = SIDE_PTR_INIT(_variant), \
                }, \
        }
#define side_field_variant(_name, _variant) \
        _side_field(_name, side_type_variant(SIDE_PARAM(_variant)))

#define _side_type_variant_define(_selector, _options, _attr) \
        { \
                .selector = _selector, \
                .options = SIDE_PTR_INIT(_options), \
                .attr = SIDE_PTR_INIT(_attr), \
                .nr_options = SIDE_ARRAY_SIZE(SIDE_PARAM(_options)), \
                .nr_attr  = SIDE_ARRAY_SIZE(SIDE_PARAM(_attr)), \
        }

#define side_define_variant(_identifier, _selector, _options, _attr...) \
        const struct side_type_variant _identifier = \
                _side_type_variant_define(SIDE_PARAM(_selector), SIDE_PARAM(_options), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_variant_literal(_selector, _options, _attr...) \
        SIDE_COMPOUND_LITERAL(const struct side_type_variant, \
                _side_type_variant_define(SIDE_PARAM(_selector), SIDE_PARAM(_options), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_type_array(_elem_type, _length, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_ARRAY), \
                .u = { \
                        .side_array = { \
                                .elem_type = SIDE_PTR_INIT(_elem_type), \
                                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                .length = _length, \
                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                        }, \
                }, \
        }
#define side_field_array(_name, _elem_type, _length, _attr...) \
        _side_field(_name, side_type_array(SIDE_PARAM(_elem_type), _length, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_type_vla(_elem_type, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_VLA), \
                .u = { \
                        .side_vla = { \
                                .elem_type = SIDE_PTR_INIT(_elem_type), \
                                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                        }, \
                }, \
        }
#define side_field_vla(_name, _elem_type, _attr...) \
        _side_field(_name, side_type_vla(SIDE_PARAM(_elem_type), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_type_vla_visitor(_elem_type, _visitor, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_VLA_VISITOR), \
                .u = { \
                        .side_vla_visitor = { \
                                .elem_type = SIDE_PTR_INIT(_elem_type), \
                                .visitor = SIDE_PTR_INIT(_visitor), \
                                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                        }, \
                }, \
        }
#define side_field_vla_visitor(_name, _elem_type, _visitor, _attr...) \
        _side_field(_name, side_type_vla_visitor(SIDE_PARAM(_elem_type), _visitor, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

/* Gather field and type definitions */

#define side_type_gather_byte(_offset, _access_mode, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_BYTE), \
                .u = { \
                        .side_gather = { \
                                .u = { \
                                        .side_byte = { \
                                                .offset = _offset, \
                                                .access_mode = _access_mode, \
                                                .type = { \
                                                        .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                        .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                }, \
                                        }, \
                                }, \
                        }, \
                }, \
        }
#define side_field_gather_byte(_name, _offset, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_byte(_offset, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define _side_type_gather_bool(_byte_order, _offset, _bool_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_BOOL), \
                .u = { \
                        .side_gather = { \
                                .u = { \
                                        .side_bool = { \
                                                .offset = _offset, \
                                                .access_mode = _access_mode, \
                                                .type = { \
                                                        .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                        .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                        .bool_size = _bool_size, \
                                                        .len_bits = _len_bits, \
                                                        .byte_order = SIDE_ENUM_INIT(_byte_order), \
                                                }, \
                                                .offset_bits = _offset_bits, \
                                        }, \
                                }, \
                        }, \
                }, \
        }
#define side_type_gather_bool(_offset, _bool_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_type_gather_bool(SIDE_TYPE_BYTE_ORDER_HOST, _offset, _bool_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_gather_bool_le(_offset, _bool_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_type_gather_bool(SIDE_TYPE_BYTE_ORDER_LE, _offset, _bool_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_gather_bool_be(_offset, _bool_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_type_gather_bool(SIDE_TYPE_BYTE_ORDER_BE, _offset, _bool_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_field_gather_bool(_name, _offset, _bool_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_bool(_offset, _bool_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))))
#define side_field_gather_bool_le(_name, _offset, _bool_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_bool_le(_offset, _bool_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))))
#define side_field_gather_bool_be(_name, _offset, _bool_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_bool_be(_offset, _bool_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))))

#define _side_type_gather_integer(_type, _signedness, _byte_order, _offset, \
                _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(_type), \
                .u = { \
                        .side_gather = { \
                                .u = { \
                                        .side_integer = { \
                                                .offset = _offset, \
                                                .access_mode = _access_mode, \
                                                .type = { \
                                                        .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                        .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                        .integer_size = _integer_size, \
                                                        .len_bits = _len_bits, \
                                                        .signedness = _signedness, \
                                                        .byte_order = SIDE_ENUM_INIT(_byte_order), \
                                                }, \
                                                .offset_bits = _offset_bits, \
                                        }, \
                                }, \
                        }, \
                }, \
        }

#define side_type_gather_unsigned_integer(_integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_type_gather_integer(SIDE_TYPE_GATHER_INTEGER, false,  SIDE_TYPE_BYTE_ORDER_HOST, \
                        _integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_gather_signed_integer(_integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_type_gather_integer(SIDE_TYPE_GATHER_INTEGER, true, SIDE_TYPE_BYTE_ORDER_HOST, \
                        _integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_type_gather_unsigned_integer_le(_integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_type_gather_integer(SIDE_TYPE_GATHER_INTEGER, false,  SIDE_TYPE_BYTE_ORDER_LE, \
                        _integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_gather_signed_integer_le(_integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_type_gather_integer(SIDE_TYPE_GATHER_INTEGER, true, SIDE_TYPE_BYTE_ORDER_LE, \
                        _integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_type_gather_unsigned_integer_be(_integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_type_gather_integer(SIDE_TYPE_GATHER_INTEGER, false,  SIDE_TYPE_BYTE_ORDER_BE, \
                        _integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_gather_signed_integer_be(_integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_type_gather_integer(SIDE_TYPE_GATHER_INTEGER, true, SIDE_TYPE_BYTE_ORDER_BE, \
                        _integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_field_gather_unsigned_integer(_name, _integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_unsigned_integer(_integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_gather_signed_integer(_name, _integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_signed_integer(_integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_field_gather_unsigned_integer_le(_name, _integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_unsigned_integer_le(_integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_gather_signed_integer_le(_name, _integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_signed_integer_le(_integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_field_gather_unsigned_integer_be(_name, _integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_unsigned_integer_be(_integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_gather_signed_integer_be(_name, _integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_signed_integer_be(_integer_offset, _integer_size, _offset_bits, _len_bits, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_type_gather_pointer(_offset, _access_mode, _attr...) \
        _side_type_gather_integer(SIDE_TYPE_GATHER_POINTER, false, SIDE_TYPE_BYTE_ORDER_HOST, \
                        _offset, sizeof(uintptr_t), 0, 0, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_field_gather_pointer(_name, _offset, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_pointer(_offset, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_type_gather_pointer_le(_offset, _access_mode, _attr...) \
        _side_type_gather_integer(SIDE_TYPE_GATHER_POINTER, false, SIDE_TYPE_BYTE_ORDER_LE, \
                        _offset, sizeof(uintptr_t), 0, 0, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_field_gather_pointer_le(_name, _offset, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_pointer_le(_offset, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_type_gather_pointer_be(_offset, _access_mode, _attr...) \
        _side_type_gather_integer(SIDE_TYPE_GATHER_POINTER, false, SIDE_TYPE_BYTE_ORDER_BE, \
                        _offset, sizeof(uintptr_t), 0, 0, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_field_gather_pointer_be(_name, _offset, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_pointer_be(_offset, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define _side_type_gather_float(_byte_order, _offset, _float_size, _access_mode, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_FLOAT), \
                .u = { \
                        .side_gather = { \
                                .u = { \
                                        .side_float = { \
                                                .offset = _offset, \
                                                .access_mode = _access_mode, \
                                                .type = { \
                                                        .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                        .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                        .float_size = _float_size, \
                                                        .byte_order = SIDE_ENUM_INIT(_byte_order), \
                                                }, \
                                        }, \
                                }, \
                        }, \
                }, \
        }

#define side_type_gather_float(_offset, _float_size, _access_mode, _attr...) \
        _side_type_gather_float(SIDE_TYPE_FLOAT_WORD_ORDER_HOST, _offset, _float_size, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_gather_float_le(_offset, _float_size, _access_mode, _attr...) \
        _side_type_gather_float(SIDE_TYPE_BYTE_ORDER_LE, _offset, _float_size, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_gather_float_be(_offset, _float_size, _access_mode, _attr...) \
        _side_type_gather_float(SIDE_TYPE_BYTE_ORDER_BE, _offset, _float_size, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_field_gather_float(_name, _offset, _float_size, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_float(_offset, _float_size, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_gather_float_le(_name, _offset, _float_size, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_float_le(_offset, _float_size, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_gather_float_be(_name, _offset, _float_size, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_float_be(_offset, _float_size, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define _side_type_gather_string(_offset, _byte_order, _unit_size, _access_mode, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_STRING), \
                .u = { \
                        .side_gather = { \
                                .u = { \
                                        .side_string = { \
                                                .offset = _offset, \
                                                .access_mode = _access_mode, \
                                                .type = { \
                                                        .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                        .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                        .unit_size = _unit_size, \
                                                        .byte_order = SIDE_ENUM_INIT(_byte_order), \
                                                }, \
                                        }, \
                                }, \
                        }, \
                }, \
        }
#define side_type_gather_string(_offset, _access_mode, _attr...) \
        _side_type_gather_string(_offset, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint8_t), _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_field_gather_string(_name, _offset, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_string(_offset, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_type_gather_string16(_offset, _access_mode, _attr...) \
        _side_type_gather_string(_offset, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint16_t), _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_gather_string16_le(_offset, _access_mode, _attr...) \
        _side_type_gather_string(_offset, SIDE_TYPE_BYTE_ORDER_LE, sizeof(uint16_t), _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_gather_string16_be(_offset, _access_mode, _attr...) \
        _side_type_gather_string(_offset, SIDE_TYPE_BYTE_ORDER_BE, sizeof(uint16_t), _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_field_gather_string16(_name, _offset, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_string16(_offset, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_gather_string16_le(_name, _offset, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_string16_le(_offset, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_gather_string16_be(_name, _offset, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_string16_be(_offset, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_type_gather_string32(_offset, _access_mode, _attr...) \
        _side_type_gather_string(_offset, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint32_t), _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_gather_string32_le(_offset, _access_mode, _attr...) \
        _side_type_gather_string(_offset, SIDE_TYPE_BYTE_ORDER_LE, sizeof(uint32_t), _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_type_gather_string32_be(_offset, _access_mode, _attr...) \
        _side_type_gather_string(_offset, SIDE_TYPE_BYTE_ORDER_BE, sizeof(uint32_t), _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_field_gather_string32(_name, _offset, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_string32(_offset, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_gather_string32_le(_name, _offset, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_string32_le(_offset, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))
#define side_field_gather_string32_be(_name, _offset, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_string32_be(_offset, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_type_gather_enum(_mappings, _elem_type) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_ENUM), \
                .u = { \
                        .side_enum = { \
                                .mappings = SIDE_PTR_INIT(_mappings), \
                                .elem_type = SIDE_PTR_INIT(_elem_type), \
                        }, \
                }, \
        }
#define side_field_gather_enum(_name, _mappings, _elem_type) \
        _side_field(_name, side_type_gather_enum(SIDE_PARAM(_mappings), SIDE_PARAM(_elem_type)))

#define side_type_gather_struct(_struct_gather, _offset, _size, _access_mode) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_STRUCT), \
                .u = { \
                        .side_gather = { \
                                .u = { \
                                        .side_struct = { \
                                                .offset = _offset, \
                                                .access_mode = _access_mode, \
                                                .type = SIDE_PTR_INIT(_struct_gather), \
                                                .size = _size, \
                                        }, \
                                }, \
                        }, \
                }, \
        }
#define side_field_gather_struct(_name, _struct_gather, _offset, _size, _access_mode) \
        _side_field(_name, side_type_gather_struct(SIDE_PARAM(_struct_gather), _offset, _size, _access_mode))

#define side_type_gather_array(_elem_type_gather, _length, _offset, _access_mode, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_ARRAY), \
                .u = { \
                        .side_gather = { \
                                .u = { \
                                        .side_array = { \
                                                .offset = _offset, \
                                                .access_mode = _access_mode, \
                                                .type = { \
                                                        .elem_type = SIDE_PTR_INIT(_elem_type_gather), \
                                                        .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                        .length = _length, \
                                                        .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                }, \
                                        }, \
                                }, \
                        }, \
                }, \
        }
#define side_field_gather_array(_name, _elem_type, _length, _offset, _access_mode, _attr...) \
        _side_field(_name, side_type_gather_array(SIDE_PARAM(_elem_type), _length, _offset, _access_mode, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_type_gather_vla(_elem_type_gather, _offset, _access_mode, _length_type_gather, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_VLA), \
                .u = { \
                        .side_gather = { \
                                .u = { \
                                        .side_vla = { \
                                                .length_type = SIDE_PTR_INIT(_length_type_gather), \
                                                .offset = _offset, \
                                                .access_mode = _access_mode, \
                                                .type = { \
                                                        .elem_type = SIDE_PTR_INIT(_elem_type_gather), \
                                                        .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                        .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                }, \
                                        }, \
                                }, \
                        }, \
                }, \
        }
#define side_field_gather_vla(_name, _elem_type_gather, _offset, _access_mode, _length_type_gather, _attr...) \
        _side_field(_name, side_type_gather_vla(SIDE_PARAM(_elem_type_gather), _offset, _access_mode, SIDE_PARAM(_length_type_gather), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())))

#define side_elem(...) \
        SIDE_COMPOUND_LITERAL(const struct side_type, __VA_ARGS__)

#define side_length(...) \
        SIDE_COMPOUND_LITERAL(const struct side_type, __VA_ARGS__)

#define side_field_list(...) \
        SIDE_COMPOUND_LITERAL(const struct side_event_field, __VA_ARGS__)

#define side_option_list(...) \
        SIDE_COMPOUND_LITERAL(const struct side_variant_option, __VA_ARGS__)

/* Stack-copy field arguments */

#define side_arg_null(_val)             { .type = SIDE_ENUM_INIT(SIDE_TYPE_NULL) }
#define side_arg_bool(_val)             { .type = SIDE_ENUM_INIT(SIDE_TYPE_BOOL), .u = { .side_static = { .bool_value = { .side_bool8 = !!(_val) } } } }
#define side_arg_byte(_val)             { .type = SIDE_ENUM_INIT(SIDE_TYPE_BYTE), .u = { .side_static = { .byte_value = (_val) } } }
#define side_arg_string(_val)           { .type = SIDE_ENUM_INIT(SIDE_TYPE_STRING_UTF8), .u = { .side_static = { .string_value = SIDE_PTR_INIT(_val) } } }
#define side_arg_string16(_val)         { .type = SIDE_ENUM_INIT(SIDE_TYPE_STRING_UTF16), .u = { .side_static = { .string_value = SIDE_PTR_INIT(_val) } } }
#define side_arg_string32(_val)         { .type = SIDE_ENUM_INIT(SIDE_TYPE_STRING_UTF32), .u = { .side_static = { .string_value = SIDE_PTR_INIT(_val) } } }

#define side_arg_u8(_val)               { .type = SIDE_ENUM_INIT(SIDE_TYPE_U8), .u = { .side_static = {  .integer_value = { .side_u8 = (_val) } } } }
#define side_arg_u16(_val)              { .type = SIDE_ENUM_INIT(SIDE_TYPE_U16), .u = { .side_static = { .integer_value = { .side_u16 = (_val) } } } }
#define side_arg_u32(_val)              { .type = SIDE_ENUM_INIT(SIDE_TYPE_U32), .u = { .side_static = { .integer_value = { .side_u32 = (_val) } } } }
#define side_arg_u64(_val)              { .type = SIDE_ENUM_INIT(SIDE_TYPE_U64), .u = { .side_static = { .integer_value = { .side_u64 = (_val) } } } }
#define side_arg_s8(_val)               { .type = SIDE_ENUM_INIT(SIDE_TYPE_S8), .u = { .side_static = { .integer_value = { .side_s8 = (_val) } } } }
#define side_arg_s16(_val)              { .type = SIDE_ENUM_INIT(SIDE_TYPE_S16), .u = { .side_static = { .integer_value = { .side_s16 = (_val) } } } }
#define side_arg_s32(_val)              { .type = SIDE_ENUM_INIT(SIDE_TYPE_S32), .u = { .side_static = { .integer_value = { .side_s32 = (_val) } } } }
#define side_arg_s64(_val)              { .type = SIDE_ENUM_INIT(SIDE_TYPE_S64), .u = { .side_static = { .integer_value = { .side_s64 = (_val) } } } }
#define side_arg_pointer(_val)          { .type = SIDE_ENUM_INIT(SIDE_TYPE_POINTER), .u = { .side_static = { .integer_value = { .side_uptr = (uintptr_t) (_val) } } } }
#define side_arg_float_binary16(_val)   { .type = SIDE_ENUM_INIT(SIDE_TYPE_FLOAT_BINARY16), .u = { .side_static = { .float_value = { .side_float_binary16 = (_val) } } } }
#define side_arg_float_binary32(_val)   { .type = SIDE_ENUM_INIT(SIDE_TYPE_FLOAT_BINARY32), .u = { .side_static = { .float_value = { .side_float_binary32 = (_val) } } } }
#define side_arg_float_binary64(_val)   { .type = SIDE_ENUM_INIT(SIDE_TYPE_FLOAT_BINARY64), .u = { .side_static = { .float_value = { .side_float_binary64 = (_val) } } } }
#define side_arg_float_binary128(_val)  { .type = SIDE_ENUM_INIT(SIDE_TYPE_FLOAT_BINARY128), .u = { .side_static = { .float_value = { .side_float_binary128 = (_val) } } } }

#define side_arg_struct(_side_type)     { .type = SIDE_ENUM_INIT(SIDE_TYPE_STRUCT), .u = { .side_static = { .side_struct = SIDE_PTR_INIT(_side_type) } } }

#define side_arg_define_variant(_identifier, _selector_val, _option) \
        const struct side_arg_variant _identifier = { \
                .selector = _selector_val, \
                .option = _option, \
        }
#define side_arg_variant(_side_variant) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_VARIANT), \
                .u = { \
                        .side_static = { \
                                .side_variant = SIDE_PTR_INIT(_side_variant), \
                        }, \
                }, \
        }

#define side_arg_array(_side_type)      { .type = SIDE_ENUM_INIT(SIDE_TYPE_ARRAY), .u = { .side_static = { .side_array = SIDE_PTR_INIT(_side_type) } } }
#define side_arg_vla(_side_type)        { .type = SIDE_ENUM_INIT(SIDE_TYPE_VLA), .u = { .side_static = { .side_vla = SIDE_PTR_INIT(_side_type) } } }
#define side_arg_vla_visitor(_ctx)      { .type = SIDE_ENUM_INIT(SIDE_TYPE_VLA_VISITOR), .u = { .side_static = { .side_vla_app_visitor_ctx = (_ctx) } } }

/* Gather field arguments */

#define side_arg_gather_bool(_ptr)              { .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_BOOL), .u = { .side_static = { .side_bool_gather_ptr = SIDE_PTR_INIT(_ptr) } } }
#define side_arg_gather_byte(_ptr)              { .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_BYTE), .u = { .side_static = { .side_byte_gather_ptr = SIDE_PTR_INIT(_ptr) } } }
#define side_arg_gather_pointer(_ptr)           { .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_POINTER), .u = { .side_static = { .side_integer_gather_ptr = SIDE_PTR_INIT(_ptr) } } }
#define side_arg_gather_integer(_ptr)           { .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_INTEGER), .u = { .side_static = { .side_integer_gather_ptr = SIDE_PTR_INIT(_ptr) } } }
#define side_arg_gather_float(_ptr)             { .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_FLOAT), .u = { .side_static = { .side_float_gather_ptr = SIDE_PTR_INIT(_ptr) } } }
#define side_arg_gather_string(_ptr)            { .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_STRING), .u = { .side_static = { .side_string_gather_ptr = SIDE_PTR_INIT(_ptr) } } }
#define side_arg_gather_struct(_ptr)            { .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_STRUCT), .u = { .side_static = { .side_struct_gather_ptr = SIDE_PTR_INIT(_ptr) } } }
#define side_arg_gather_array(_ptr)             { .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_ARRAY), .u = { .side_static = { .side_array_gather_ptr = SIDE_PTR_INIT(_ptr) } } }
#define side_arg_gather_vla(_ptr, _length_ptr)  { .type = SIDE_ENUM_INIT(SIDE_TYPE_GATHER_VLA), .u = { .side_static = { .side_vla_gather = { .ptr = SIDE_PTR_INIT(_ptr), .length_ptr = SIDE_PTR_INIT(_length_ptr) } } } }

/* Dynamic field arguments */

#define side_arg_dynamic_null(_attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_DYNAMIC_NULL), \
                .u = { \
                        .side_dynamic = { \
                                .side_null = { \
                                        .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                        .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                }, \
                        }, \
                }, \
        }

#define side_arg_dynamic_bool(_val, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_DYNAMIC_BOOL), \
                .u = { \
                        .side_dynamic = { \
                                .side_bool = { \
                                        .type = { \
                                                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                .bool_size = sizeof(uint8_t), \
                                                .len_bits = 0, \
                                                .byte_order = SIDE_ENUM_INIT(SIDE_TYPE_BYTE_ORDER_HOST), \
                                        }, \
                                        .value = { \
                                                .side_bool8 = !!(_val), \
                                        }, \
                                }, \
                        }, \
                }, \
        }

#define side_arg_dynamic_byte(_val, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_DYNAMIC_BYTE), \
                .u = { \
                        .side_dynamic = { \
                                .side_byte = { \
                                        .type = { \
                                                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                        }, \
                                        .value = (_val), \
                                }, \
                        }, \
                }, \
        }

#define _side_arg_dynamic_string(_val, _byte_order, _unit_size, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_DYNAMIC_STRING), \
                .u = { \
                        .side_dynamic = { \
                                .side_string = { \
                                        .type = { \
                                                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                .unit_size = _unit_size, \
                                                .byte_order = SIDE_ENUM_INIT(_byte_order), \
                                        }, \
                                        .value = (uintptr_t) (_val), \
                                }, \
                        }, \
                }, \
        }
#define side_arg_dynamic_string(_val, _attr...) \
        _side_arg_dynamic_string(_val, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint8_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_string16(_val, _attr...) \
        _side_arg_dynamic_string(_val, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint16_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_string16_le(_val, _attr...) \
        _side_arg_dynamic_string(_val, SIDE_TYPE_BYTE_ORDER_LE, sizeof(uint16_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_string16_be(_val, _attr...) \
        _side_arg_dynamic_string(_val, SIDE_TYPE_BYTE_ORDER_BE, sizeof(uint16_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_string32(_val, _attr...) \
        _side_arg_dynamic_string(_val, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint32_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_string32_le(_val, _attr...) \
        _side_arg_dynamic_string(_val, SIDE_TYPE_BYTE_ORDER_LE, sizeof(uint32_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_string32_be(_val, _attr...) \
        _side_arg_dynamic_string(_val, SIDE_TYPE_BYTE_ORDER_BE, sizeof(uint32_t), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define _side_arg_dynamic_integer(_field, _val, _type, _signedness, _byte_order, _integer_size, _len_bits, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(_type), \
                .u = { \
                        .side_dynamic = { \
                                .side_integer = { \
                                        .type = { \
                                                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                .integer_size = _integer_size, \
                                                .len_bits = _len_bits, \
                                                .signedness = _signedness, \
                                                .byte_order = SIDE_ENUM_INIT(_byte_order), \
                                        }, \
                                        .value = { \
                                                _field = (_val), \
                                        }, \
                                }, \
                        }, \
                }, \
        }

#define side_arg_dynamic_u8(_val, _attr...) \
        _side_arg_dynamic_integer(.side_u8, _val, SIDE_TYPE_DYNAMIC_INTEGER, false, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(uint8_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_s8(_val, _attr...) \
        _side_arg_dynamic_integer(.side_s8, _val, SIDE_TYPE_DYNAMIC_INTEGER, true, SIDE_TYPE_BYTE_ORDER_HOST, sizeof(int8_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define _side_arg_dynamic_u16(_val, _byte_order, _attr...) \
        _side_arg_dynamic_integer(.side_u16, _val, SIDE_TYPE_DYNAMIC_INTEGER, false, _byte_order, sizeof(uint16_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define _side_arg_dynamic_u32(_val, _byte_order, _attr...) \
        _side_arg_dynamic_integer(.side_u32, _val, SIDE_TYPE_DYNAMIC_INTEGER, false, _byte_order, sizeof(uint32_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define _side_arg_dynamic_u64(_val, _byte_order, _attr...) \
        _side_arg_dynamic_integer(.side_u64, _val, SIDE_TYPE_DYNAMIC_INTEGER, false, _byte_order, sizeof(uint64_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define _side_arg_dynamic_s16(_val, _byte_order, _attr...) \
        _side_arg_dynamic_integer(.side_s16, _val, SIDE_TYPE_DYNAMIC_INTEGER, true, _byte_order, sizeof(int16_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define _side_arg_dynamic_s32(_val, _byte_order, _attr...) \
        _side_arg_dynamic_integer(.side_s32, _val, SIDE_TYPE_DYNAMIC_INTEGER, true, _byte_order, sizeof(int32_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define _side_arg_dynamic_s64(_val, _byte_order, _attr...) \
        _side_arg_dynamic_integer(.side_s64, _val, SIDE_TYPE_DYNAMIC_INTEGER, true, _byte_order, sizeof(int64_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define _side_arg_dynamic_pointer(_val, _byte_order, _attr...) \
        _side_arg_dynamic_integer(.side_uptr, (uintptr_t) (_val), SIDE_TYPE_DYNAMIC_POINTER, false, _byte_order, \
                        sizeof(uintptr_t), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define _side_arg_dynamic_float(_field, _val, _type, _byte_order, _float_size, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(_type), \
                .u = { \
                        .side_dynamic = { \
                                .side_float = { \
                                        .type = { \
                                                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                                .float_size = _float_size, \
                                                .byte_order = SIDE_ENUM_INIT(_byte_order), \
                                        }, \
                                        .value = { \
                                                _field = (_val), \
                                        }, \
                                }, \
                        }, \
                }, \
        }

#define _side_arg_dynamic_float_binary16(_val, _byte_order, _attr...) \
        _side_arg_dynamic_float(.side_float_binary16, _val, SIDE_TYPE_DYNAMIC_FLOAT, _byte_order, sizeof(_Float16), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define _side_arg_dynamic_float_binary32(_val, _byte_order, _attr...) \
        _side_arg_dynamic_float(.side_float_binary32, _val, SIDE_TYPE_DYNAMIC_FLOAT, _byte_order, sizeof(_Float32), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define _side_arg_dynamic_float_binary64(_val, _byte_order, _attr...) \
        _side_arg_dynamic_float(.side_float_binary64, _val, SIDE_TYPE_DYNAMIC_FLOAT, _byte_order, sizeof(_Float64), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define _side_arg_dynamic_float_binary128(_val, _byte_order, _attr...) \
        _side_arg_dynamic_float(.side_float_binary128, _val, SIDE_TYPE_DYNAMIC_FLOAT, _byte_order, sizeof(_Float128), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

/* Host endian */
#define side_arg_dynamic_u16(_val, _attr...)                    _side_arg_dynamic_u16(_val, SIDE_TYPE_BYTE_ORDER_HOST, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_u32(_val, _attr...)                    _side_arg_dynamic_u32(_val, SIDE_TYPE_BYTE_ORDER_HOST, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_u64(_val, _attr...)                    _side_arg_dynamic_u64(_val, SIDE_TYPE_BYTE_ORDER_HOST, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_s16(_val, _attr...)                    _side_arg_dynamic_s16(_val, SIDE_TYPE_BYTE_ORDER_HOST, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_s32(_val, _attr...)                    _side_arg_dynamic_s32(_val, SIDE_TYPE_BYTE_ORDER_HOST, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_s64(_val, _attr...)                    _side_arg_dynamic_s64(_val, SIDE_TYPE_BYTE_ORDER_HOST, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_pointer(_val, _attr...)                _side_arg_dynamic_pointer(_val, SIDE_TYPE_BYTE_ORDER_HOST, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_float_binary16(_val, _attr...)         _side_arg_dynamic_float_binary16(_val, SIDE_TYPE_FLOAT_WORD_ORDER_HOST, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_float_binary32(_val, _attr...)         _side_arg_dynamic_float_binary32(_val, SIDE_TYPE_FLOAT_WORD_ORDER_HOST, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_float_binary64(_val, _attr...)         _side_arg_dynamic_float_binary64(_val, SIDE_TYPE_FLOAT_WORD_ORDER_HOST, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_float_binary128(_val, _attr...)        _side_arg_dynamic_float_binary128(_val, SIDE_TYPE_FLOAT_WORD_ORDER_HOST, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

/* Little endian */
#define side_arg_dynamic_u16_le(_val, _attr...)                 _side_arg_dynamic_u16(_val, SIDE_TYPE_BYTE_ORDER_LE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_u32_le(_val, _attr...)                 _side_arg_dynamic_u32(_val, SIDE_TYPE_BYTE_ORDER_LE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_u64_le(_val, _attr...)                 _side_arg_dynamic_u64(_val, SIDE_TYPE_BYTE_ORDER_LE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_s16_le(_val, _attr...)                 _side_arg_dynamic_s16(_val, SIDE_TYPE_BYTE_ORDER_LE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_s32_le(_val, _attr...)                 _side_arg_dynamic_s32(_val, SIDE_TYPE_BYTE_ORDER_LE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_s64_le(_val, _attr...)                 _side_arg_dynamic_s64(_val, SIDE_TYPE_BYTE_ORDER_LE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_pointer_le(_val, _attr...)             _side_arg_dynamic_pointer(_val, SIDE_TYPE_BYTE_ORDER_LE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_float_binary16_le(_val, _attr...)      _side_arg_dynamic_float_binary16(_val, SIDE_TYPE_BYTE_ORDER_LE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_float_binary32_le(_val, _attr...)      _side_arg_dynamic_float_binary32(_val, SIDE_TYPE_BYTE_ORDER_LE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_float_binary64_le(_val, _attr...)      _side_arg_dynamic_float_binary64(_val, SIDE_TYPE_BYTE_ORDER_LE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_float_binary128_le(_val, _attr...)     _side_arg_dynamic_float_binary128(_val, SIDE_TYPE_BYTE_ORDER_LE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

/* Big endian */
#define side_arg_dynamic_u16_be(_val, _attr...)                 _side_arg_dynamic_u16(_val, SIDE_TYPE_BYTE_ORDER_BE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_u32_be(_val, _attr...)                 _side_arg_dynamic_u32(_val, SIDE_TYPE_BYTE_ORDER_BE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_u64_be(_val, _attr...)                 _side_arg_dynamic_u64(_val, SIDE_TYPE_BYTE_ORDER_BE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_s16_be(_val, _attr...)                 _side_arg_dynamic_s16(_val, SIDE_TYPE_BYTE_ORDER_BE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_s32_be(_val, _attr...)                 _side_arg_dynamic_s32(_val, SIDE_TYPE_BYTE_ORDER_BE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_s64_be(_val, _attr...)                 _side_arg_dynamic_s64(_val, SIDE_TYPE_BYTE_ORDER_BE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_pointer_be(_val, _attr...)             _side_arg_dynamic_pointer(_val, SIDE_TYPE_BYTE_ORDER_BE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_float_binary16_be(_val, _attr...)      _side_arg_dynamic_float_binary16(_val, SIDE_TYPE_BYTE_ORDER_BE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_float_binary32_be(_val, _attr...)      _side_arg_dynamic_float_binary32(_val, SIDE_TYPE_BYTE_ORDER_BE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_float_binary64_be(_val, _attr...)      _side_arg_dynamic_float_binary64(_val, SIDE_TYPE_BYTE_ORDER_BE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))
#define side_arg_dynamic_float_binary128_be(_val, _attr...)     _side_arg_dynamic_float_binary128(_val, SIDE_TYPE_BYTE_ORDER_BE, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_arg_dynamic_vla(_vla) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_DYNAMIC_VLA), \
                .u = { \
                        .side_dynamic = { \
                                .side_dynamic_vla = SIDE_PTR_INIT(_vla), \
                        }, \
                }, \
        }

#define side_arg_dynamic_vla_visitor(_dynamic_vla_visitor, _ctx, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_DYNAMIC_VLA_VISITOR), \
                .u = { \
                        .side_dynamic = { \
                                .side_dynamic_vla_visitor = { \
                                        .app_ctx = SIDE_PTR_INIT(_ctx), \
                                        .visitor = SIDE_PTR_INIT(_dynamic_vla_visitor), \
                                        .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                        .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                }, \
                        }, \
                }, \
        }

#define side_arg_dynamic_struct(_struct) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_DYNAMIC_STRUCT), \
                .u = { \
                        .side_dynamic = { \
                                .side_dynamic_struct = SIDE_PTR_INIT(_struct), \
                        }, \
                }, \
        }

#define side_arg_dynamic_struct_visitor(_dynamic_struct_visitor, _ctx, _attr...) \
        { \
                .type = SIDE_ENUM_INIT(SIDE_TYPE_DYNAMIC_STRUCT_VISITOR), \
                .u = { \
                        .side_dynamic = { \
                                .side_dynamic_struct_visitor = { \
                                        .app_ctx = SIDE_PTR_INIT(_ctx), \
                                        .visitor = SIDE_PTR_INIT(_dynamic_struct_visitor), \
                                        .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                        .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                                }, \
                        }, \
                }, \
        }

#define side_arg_dynamic_define_vec(_identifier, _sav, _attr...) \
        const struct side_arg _identifier##_vec[] = { _sav }; \
        const struct side_arg_dynamic_vla _identifier = { \
                .sav = SIDE_PTR_INIT(_identifier##_vec), \
                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                .len = SIDE_ARRAY_SIZE(_identifier##_vec), \
                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
        }

#define side_arg_dynamic_define_struct(_identifier, _struct_fields, _attr...) \
        const struct side_arg_dynamic_field _identifier##_fields[] = { _struct_fields }; \
        const struct side_arg_dynamic_struct _identifier = { \
                .fields = SIDE_PTR_INIT(_identifier##_fields), \
                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                .len = SIDE_ARRAY_SIZE(_identifier##_fields), \
                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
        }

#define side_arg_define_vec(_identifier, _sav) \
        const struct side_arg _identifier##_vec[] = { _sav }; \
        const struct side_arg_vec _identifier = { \
                .sav = SIDE_PTR_INIT(_identifier##_vec), \
                .len = SIDE_ARRAY_SIZE(_identifier##_vec), \
        }

#define side_arg_dynamic_field(_name, _elem) \
        { \
                .field_name = SIDE_PTR_INIT(_name), \
                .elem = _elem, \
        }

/*
 * Event instrumentation description registration, runtime enabled state
 * check, and instrumentation invocation.
 */

#define side_arg_list(...)      __VA_ARGS__

#define side_event_cond(_identifier) \
        if (side_unlikely(__atomic_load_n(&side_event_state__##_identifier.enabled, \
                                        __ATOMIC_RELAXED)))

#define side_event_call(_identifier, _sav) \
        { \
                const struct side_arg side_sav[] = { _sav }; \
                const struct side_arg_vec side_arg_vec = { \
                        .sav = SIDE_PTR_INIT(side_sav), \
                        .len = SIDE_ARRAY_SIZE(side_sav), \
                }; \
                side_call(&(side_event_state__##_identifier), &side_arg_vec); \
        }

#define side_event(_identifier, _sav) \
        side_event_cond(_identifier) \
                side_event_call(_identifier, SIDE_PARAM(_sav))

#define side_event_call_variadic(_identifier, _sav, _var_fields, _attr...) \
        { \
                const struct side_arg side_sav[] = { _sav }; \
                const struct side_arg_vec side_arg_vec = { \
                        .sav = SIDE_PTR_INIT(side_sav), \
                        .len = SIDE_ARRAY_SIZE(side_sav), \
                }; \
                const struct side_arg_dynamic_field side_fields[] = { _var_fields }; \
                const struct side_arg_dynamic_struct var_struct = { \
                        .fields = SIDE_PTR_INIT(side_fields), \
                        .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                        .len = SIDE_ARRAY_SIZE(side_fields), \
                        .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                }; \
                side_call_variadic(&(side_event_state__##_identifier), &side_arg_vec, &var_struct); \
        }

#define side_event_variadic(_identifier, _sav, _var, _attr...) \
        side_event_cond(_identifier) \
                side_event_call_variadic(_identifier, SIDE_PARAM(_sav), SIDE_PARAM(_var), SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define _side_define_event(_linkage, _identifier, _provider, _event, _loglevel, _fields, _flags, _attr...) \
        _linkage struct side_event_description __attribute__((section("side_event_description"))) \
                        _identifier; \
        _linkage struct side_event_state __attribute__((section("side_event_state"))) \
                        side_event_state__##_identifier = { \
                .enabled = 0, \
                .callbacks = &side_empty_callback, \
                .desc = &(_identifier), \
        }; \
        _linkage struct side_event_description __attribute__((section("side_event_description"))) \
                        _identifier = { \
                .struct_size = offsetof(struct side_event_description, end), \
                .version = SIDE_ABI_VERSION, \
                .state = SIDE_PTR_INIT(&(side_event_state__##_identifier)), \
                .provider_name = SIDE_PTR_INIT(_provider), \
                .event_name = SIDE_PTR_INIT(_event), \
                .fields = SIDE_PTR_INIT(_fields), \
                .attr = SIDE_PTR_INIT(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                .flags = (_flags), \
                .nr_side_type_label = _NR_SIDE_TYPE_LABEL, \
                .nr_side_attr_type = _NR_SIDE_ATTR_TYPE, \
                .loglevel = SIDE_ENUM_INIT(_loglevel), \
                .nr_fields = SIDE_ARRAY_SIZE(SIDE_PARAM(_fields)), \
                .nr_attr = SIDE_ARRAY_SIZE(SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list())), \
                .nr_callbacks = 0, \
        }; \
        static const struct side_event_description *side_event_ptr__##_identifier \
                __attribute__((section("side_event_description_ptr"), used)) = &(_identifier);

#define side_static_event(_identifier, _provider, _event, _loglevel, _fields, _attr...) \
        _side_define_event(static, _identifier, _provider, _event, _loglevel, SIDE_PARAM(_fields), \
                        0, ##_attr)

#define side_static_event_variadic(_identifier, _provider, _event, _loglevel, _fields, _attr...) \
        _side_define_event(static, _identifier, _provider, _event, _loglevel, SIDE_PARAM(_fields), \
                        SIDE_EVENT_FLAG_VARIADIC, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_hidden_event(_identifier, _provider, _event, _loglevel, _fields, _attr...) \
        _side_define_event(__attribute__((visibility("hidden"))), _identifier, _provider, _event, \
                        _loglevel, SIDE_PARAM(_fields), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_hidden_event_variadic(_identifier, _provider, _event, _loglevel, _fields, _attr...) \
        _side_define_event(__attribute__((visibility("hidden"))), _identifier, _provider, _event, \
                        _loglevel, SIDE_PARAM(_fields), SIDE_EVENT_FLAG_VARIADIC, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_export_event(_identifier, _provider, _event, _loglevel, _fields, _attr...) \
        _side_define_event(__attribute__((visibility("default"))), _identifier, _provider, _event, \
                        _loglevel, SIDE_PARAM(_fields), 0, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_export_event_variadic(_identifier, _provider, _event, _loglevel, _fields, _attr...) \
        _side_define_event(__attribute__((visibility("default"))), _identifier, _provider, _event, \
                        _loglevel, SIDE_PARAM(_fields), SIDE_EVENT_FLAG_VARIADIC, SIDE_PARAM_SELECT_ARG1(_, ##_attr, side_attr_list()))

#define side_declare_event(_identifier) \
        extern struct side_event_state side_event_state_##_identifier; \
        extern struct side_event_description _identifier

#ifdef __cplusplus
extern "C" {
#endif

struct side_callback {
        union {
                void (*call)(const struct side_event_description *desc,
                        const struct side_arg_vec *side_arg_vec,
                        void *priv);
                void (*call_variadic)(const struct side_event_description *desc,
                        const struct side_arg_vec *side_arg_vec,
                        const struct side_arg_dynamic_struct *var_struct,
                        void *priv);
        } SIDE_PACKED u;
        void *priv;
} SIDE_PACKED;

/* The visitor pattern is a double-dispatch visitor. */
struct side_tracer_visitor_ctx {
        side_write_elem_func write_elem;
        void *priv;             /* Private tracer context. */
} SIDE_PACKED;

struct side_tracer_dynamic_struct_visitor_ctx {
        side_write_field_func write_field;
        void *priv;             /* Private tracer context. */
} SIDE_PACKED;

extern const struct side_callback side_empty_callback;

void side_call(const struct side_event_state *state,
        const struct side_arg_vec *side_arg_vec);
void side_call_variadic(const struct side_event_state *state,
        const struct side_arg_vec *side_arg_vec,
        const struct side_arg_dynamic_struct *var_struct);

struct side_events_register_handle *side_events_register(struct side_event_description **events,
                uint32_t nr_events);
void side_events_unregister(struct side_events_register_handle *handle);

/*
 * Userspace tracer registration API. This allows userspace tracers to
 * register event notification callbacks to be notified of the currently
 * registered instrumentation, and to register their callbacks to
 * specific events.
 */
typedef void (*side_tracer_callback_func)(const struct side_event_description *desc,
                        const struct side_arg_vec *side_arg_vec,
                        void *priv);
typedef void (*side_tracer_callback_variadic_func)(const struct side_event_description *desc,
                        const struct side_arg_vec *side_arg_vec,
                        const struct side_arg_dynamic_struct *var_struct,
                        void *priv);

int side_tracer_callback_register(struct side_event_description *desc,
                side_tracer_callback_func call,
                void *priv);
int side_tracer_callback_variadic_register(struct side_event_description *desc,
                side_tracer_callback_variadic_func call_variadic,
                void *priv);
int side_tracer_callback_unregister(struct side_event_description *desc,
                side_tracer_callback_func call,
                void *priv);
int side_tracer_callback_variadic_unregister(struct side_event_description *desc,
                side_tracer_callback_variadic_func call_variadic,
                void *priv);

enum side_tracer_notification {
        SIDE_TRACER_NOTIFICATION_INSERT_EVENTS,
        SIDE_TRACER_NOTIFICATION_REMOVE_EVENTS,
};

/* Callback is invoked with side library internal lock held. */
struct side_tracer_handle *side_tracer_event_notification_register(
                void (*cb)(enum side_tracer_notification notif,
                        struct side_event_description **events, uint32_t nr_events, void *priv),
                void *priv);
void side_tracer_event_notification_unregister(struct side_tracer_handle *handle);

/*
 * Explicit hooks to initialize/finalize the side instrumentation
 * library. Those are also library constructor/destructor.
 */
void side_init(void) __attribute__((constructor));
void side_exit(void) __attribute__((destructor));

/*
 * The following constructors/destructors perform automatic registration
 * of the declared side events. Those may have to be called explicitly
 * in a statically linked library.
 */

/*
 * These weak symbols, the constructor, and destructor take care of
 * registering only _one_ instance of the side instrumentation per
 * shared-ojbect (or for the whole main program).
 */
extern struct side_event_description * __start_side_event_description_ptr[]
        __attribute__((weak, visibility("hidden")));
extern struct side_event_description * __stop_side_event_description_ptr[]
        __attribute__((weak, visibility("hidden")));
int side_event_description_ptr_registered
        __attribute__((weak, visibility("hidden")));
struct side_events_register_handle *side_events_handle
        __attribute__((weak, visibility("hidden")));

static void
side_event_description_ptr_init(void)
        __attribute__((no_instrument_function))
        __attribute__((constructor));
static void
side_event_description_ptr_init(void)
{
        if (side_event_description_ptr_registered++)
                return;
        side_events_handle = side_events_register(__start_side_event_description_ptr,
                __stop_side_event_description_ptr - __start_side_event_description_ptr);
}

static void
side_event_description_ptr_exit(void)
        __attribute__((no_instrument_function))
        __attribute__((destructor));
static void
side_event_description_ptr_exit(void)
{
        if (--side_event_description_ptr_registered)
                return;
        side_events_unregister(side_events_handle);
        side_events_handle = NULL;
}

#ifdef __cplusplus
}
#endif

#endif /* _SIDE_TRACE_H */