[babeltrace.git] / types / struct.c

/*
 * struct.c
 *
 * BabelTrace - Structure Type Converter
 *
 * Copyright 2010, 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 */

#include <babeltrace/compiler.h>
#include <babeltrace/format.h>

#ifndef max
#define max(a, b)	((a) < (b) ? (b) : (a))
#endif

static
struct definition *_struct_definition_new(struct type *type,
				struct definition_scope *parent_scope);
static
void _struct_definition_free(struct definition *definition);

void struct_copy(struct stream_pos *dest, const struct format *fdest, 
		 struct stream_pos *src, const struct format *fsrc,
		 struct definition *definition)
{
	struct definition_struct *_struct =
		container_of(definition, struct definition_struct, p);
	struct type_struct *struct_type = _struct->type;
	unsigned long i;

	fsrc->struct_begin(src, struct_type);
	fdest->struct_begin(dest, struct_type);

	for (i = 0; i < _struct->fields->len; i++) {
		struct field *field = &g_array_index(_struct->fields,
						     struct field, i);
		struct type *field_type = field->definition->type;

		field_type->copy(dest, fdest, src, fsrc, field->definition);

	}
	fsrc->struct_end(src, struct_type);
	fdest->struct_end(dest, struct_type);
}

static
void _struct_type_free(struct type *type)
{
	struct type_struct *struct_type =
		container_of(type, struct type_struct, p);
	unsigned long i;

	free_type_scope(struct_type->scope);
	g_hash_table_destroy(struct_type->fields_by_name);

	for (i = 0; i < struct_type->fields->len; i++) {
		struct type_field *type_field =
			&g_array_index(struct_type->fields,
				       struct type_field, i);
		type_unref(type_field->type);
	}
	g_array_free(struct_type->fields, true);
	g_free(struct_type);
}

struct type_struct *struct_type_new(const char *name,
				    struct type_scope *parent_scope)
{
	struct type_struct *struct_type;
	struct type *type;

	struct_type = g_new(struct type_struct, 1);
	type = &struct_type->p;
	struct_type->fields_by_name = g_hash_table_new(g_direct_hash,
						       g_direct_equal);
	struct_type->fields = g_array_sized_new(FALSE, TRUE,
						sizeof(struct type_field),
						DEFAULT_NR_STRUCT_FIELDS);
	struct_type->scope = new_type_scope(parent_scope);
	type->id = CTF_TYPE_STRUCT;
	type->name = g_quark_from_string(name);
	type->alignment = 1;
	type->copy = struct_copy;
	type->type_free = _struct_type_free;
	type->definition_new = _struct_definition_new;
	type->definition_free = _struct_definition_free;
	type->ref = 1;
	return struct_type;
}

static
struct definition *
	_struct_definition_new(struct type *type,
			       struct definition_scope *parent_scope)
{
	struct type_struct *struct_type =
		container_of(type, struct type_struct, p);
	struct definition_struct *_struct;
	unsigned long i;
	int ret;

	_struct = g_new(struct definition_struct, 1);
	type_ref(&struct_type->p);
	_struct->p.type = type;
	_struct->type = struct_type;
	_struct->p.ref = 1;
	_struct->scope = new_definition_scope(parent_scope);
	_struct->fields = g_array_sized_new(FALSE, TRUE,
					    sizeof(struct field),
					    DEFAULT_NR_STRUCT_FIELDS);
	g_array_set_size(_struct->fields, struct_type->fields->len);
	for (i = 0; i < struct_type->fields->len; i++) {
		struct type_field *type_field =
			&g_array_index(struct_type->fields,
				       struct type_field, i);
		struct field *field = &g_array_index(_struct->fields,
						     struct field, i);

		field->name = type_field->name;
		field->definition =
			type_field->type->definition_new(type_field->type,
							  _struct->scope);
		ret = register_field_definition(field->name,
						field->definition,
						_struct->scope);
		assert(!ret);
	}
	return &_struct->p;
}

static
void _struct_definition_free(struct definition *definition)
{
	struct definition_struct *_struct =
		container_of(definition, struct definition_struct, p);
	unsigned long i;

	assert(_struct->fields->len == _struct->type->fields->len);
	for (i = 0; i < _struct->fields->len; i++) {
		struct field *field = &g_array_index(_struct->fields,
						     struct field, i);
		definition_unref(field->definition);
	}
	free_definition_scope(_struct->scope);
	type_unref(_struct->p.type);
	g_free(_struct);
}

void struct_type_add_field(struct type_struct *struct_type,
			   const char *field_name,
			   struct type *field_type)
{
	struct type_field *field;
	unsigned long index;

	g_array_set_size(struct_type->fields, struct_type->fields->len + 1);
	index = struct_type->fields->len - 1;	/* last field (new) */
	field = &g_array_index(struct_type->fields, struct type_field, index);
	field->name = g_quark_from_string(field_name);
	type_ref(field_type);
	field->type = field_type;
	/* Keep index in hash rather than pointer, because array can relocate */
	g_hash_table_insert(struct_type->fields_by_name,
			    (gpointer) (unsigned long) field->name,
			    (gpointer) index);
	/*
	 * Alignment of structure is the max alignment of types contained
	 * therein.
	 */
	struct_type->p.alignment = max(struct_type->p.alignment,
				       field_type->alignment);
}

unsigned long
	struct_type_lookup_field_index(struct type_struct *struct_type,
				       GQuark field_name)
{
	unsigned long index;

	index = (unsigned long) g_hash_table_lookup(struct_type->fields_by_name,
						    (gconstpointer) (unsigned long) field_name);
	return index;
}

/*
 * field returned only valid as long as the field structure is not appended to.
 */
struct type_field *
	struct_type_get_field_from_index(struct type_struct *struct_type,
					 unsigned long index)
{
	return &g_array_index(struct_type->fields, struct type_field, index);
}

/*
 * field returned only valid as long as the field structure is not appended to.
 */
struct field *
struct_definition_get_field_from_index(struct definition_struct *_struct,
					unsigned long index)
{
	return &g_array_index(_struct->fields, struct field, index);
}
Commit	Line	Data
	1	/*
	2	* struct.c
	3	*
	4	* BabelTrace - Structure Type Converter
	5	*
	6	* Copyright 2010, 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	7	*
	8	* Permission is hereby granted, free of charge, to any person obtaining a copy
	9	* of this software and associated documentation files (the "Software"), to deal
	10	* in the Software without restriction, including without limitation the rights
	11	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	12	* copies of the Software, and to permit persons to whom the Software is
	13	* furnished to do so, subject to the following conditions:
	14	*
	15	* The above copyright notice and this permission notice shall be included in
	16	* all copies or substantial portions of the Software.
	17	*/
	18
	19	#include <babeltrace/compiler.h>
	20	#include <babeltrace/format.h>
	21
	22	#ifndef max
	23	#define max(a, b) ((a) < (b) ? (b) : (a))
	24	#endif
	25
	26	static
	27	struct definition _struct_definition_new(struct type type,
	28	struct definition_scope *parent_scope);
	29	static
	30	void _struct_definition_free(struct definition *definition);
	31
	32	void struct_copy(struct stream_pos dest, const struct format fdest,
	33	struct stream_pos src, const struct format fsrc,
	34	struct definition *definition)
	35	{
	36	struct definition_struct *_struct =
	37	container_of(definition, struct definition_struct, p);
	38	struct type_struct *struct_type = _struct->type;
	39	unsigned long i;
	40
	41	fsrc->struct_begin(src, struct_type);
	42	fdest->struct_begin(dest, struct_type);
	43
	44	for (i = 0; i < _struct->fields->len; i++) {
	45	struct field *field = &g_array_index(_struct->fields,
	46	struct field, i);
	47	struct type *field_type = field->definition->type;
	48
	49	field_type->copy(dest, fdest, src, fsrc, field->definition);
	50
	51	}
	52	fsrc->struct_end(src, struct_type);
	53	fdest->struct_end(dest, struct_type);
	54	}
	55
	56	static
	57	void _struct_type_free(struct type *type)
	58	{
	59	struct type_struct *struct_type =
	60	container_of(type, struct type_struct, p);
	61	unsigned long i;
	62
	63	free_type_scope(struct_type->scope);
	64	g_hash_table_destroy(struct_type->fields_by_name);
	65
	66	for (i = 0; i < struct_type->fields->len; i++) {
	67	struct type_field *type_field =
	68	&g_array_index(struct_type->fields,
	69	struct type_field, i);
	70	type_unref(type_field->type);
	71	}
	72	g_array_free(struct_type->fields, true);
	73	g_free(struct_type);
	74	}
	75
	76	struct type_struct struct_type_new(const char name,
	77	struct type_scope *parent_scope)
	78	{
	79	struct type_struct *struct_type;
	80	struct type *type;
	81
	82	struct_type = g_new(struct type_struct, 1);
	83	type = &struct_type->p;
	84	struct_type->fields_by_name = g_hash_table_new(g_direct_hash,
	85	g_direct_equal);
	86	struct_type->fields = g_array_sized_new(FALSE, TRUE,
	87	sizeof(struct type_field),
	88	DEFAULT_NR_STRUCT_FIELDS);
	89	struct_type->scope = new_type_scope(parent_scope);
	90	type->id = CTF_TYPE_STRUCT;
	91	type->name = g_quark_from_string(name);
	92	type->alignment = 1;
	93	type->copy = struct_copy;
	94	type->type_free = _struct_type_free;
	95	type->definition_new = _struct_definition_new;
	96	type->definition_free = _struct_definition_free;
	97	type->ref = 1;
	98	return struct_type;
	99	}
	100
	101	static
	102	struct definition *
	103	_struct_definition_new(struct type *type,
	104	struct definition_scope *parent_scope)
	105	{
	106	struct type_struct *struct_type =
	107	container_of(type, struct type_struct, p);
	108	struct definition_struct *_struct;
	109	unsigned long i;
	110	int ret;
	111
	112	_struct = g_new(struct definition_struct, 1);
	113	type_ref(&struct_type->p);
	114	_struct->p.type = type;
	115	_struct->type = struct_type;
	116	_struct->p.ref = 1;
	117	_struct->scope = new_definition_scope(parent_scope);
	118	_struct->fields = g_array_sized_new(FALSE, TRUE,
	119	sizeof(struct field),
	120	DEFAULT_NR_STRUCT_FIELDS);
	121	g_array_set_size(_struct->fields, struct_type->fields->len);
	122	for (i = 0; i < struct_type->fields->len; i++) {
	123	struct type_field *type_field =
	124	&g_array_index(struct_type->fields,
	125	struct type_field, i);
	126	struct field *field = &g_array_index(_struct->fields,
	127	struct field, i);
	128
	129	field->name = type_field->name;
	130	field->definition =
	131	type_field->type->definition_new(type_field->type,
	132	_struct->scope);
	133	ret = register_field_definition(field->name,
	134	field->definition,
	135	_struct->scope);
	136	assert(!ret);
	137	}
	138	return &_struct->p;
	139	}
	140
	141	static
	142	void _struct_definition_free(struct definition *definition)
	143	{
	144	struct definition_struct *_struct =
	145	container_of(definition, struct definition_struct, p);
	146	unsigned long i;
	147
	148	assert(_struct->fields->len == _struct->type->fields->len);
	149	for (i = 0; i < _struct->fields->len; i++) {
	150	struct field *field = &g_array_index(_struct->fields,
	151	struct field, i);
	152	definition_unref(field->definition);
	153	}
	154	free_definition_scope(_struct->scope);
	155	type_unref(_struct->p.type);
	156	g_free(_struct);
	157	}
	158
	159	void struct_type_add_field(struct type_struct *struct_type,
	160	const char *field_name,
	161	struct type *field_type)
	162	{
	163	struct type_field *field;
	164	unsigned long index;
	165
	166	g_array_set_size(struct_type->fields, struct_type->fields->len + 1);
	167	index = struct_type->fields->len - 1; /* last field (new) */
	168	field = &g_array_index(struct_type->fields, struct type_field, index);
	169	field->name = g_quark_from_string(field_name);
	170	type_ref(field_type);
	171	field->type = field_type;
	172	/* Keep index in hash rather than pointer, because array can relocate */
	173	g_hash_table_insert(struct_type->fields_by_name,
	174	(gpointer) (unsigned long) field->name,
	175	(gpointer) index);
	176	/*
	177	* Alignment of structure is the max alignment of types contained
	178	* therein.
	179	*/
	180	struct_type->p.alignment = max(struct_type->p.alignment,
	181	field_type->alignment);
	182	}
	183
	184	unsigned long
	185	struct_type_lookup_field_index(struct type_struct *struct_type,
	186	GQuark field_name)
	187	{
	188	unsigned long index;
	189
	190	index = (unsigned long) g_hash_table_lookup(struct_type->fields_by_name,
	191	(gconstpointer) (unsigned long) field_name);
	192	return index;
	193	}
	194
	195	/*
	196	* field returned only valid as long as the field structure is not appended to.
	197	*/
	198	struct type_field *
	199	struct_type_get_field_from_index(struct type_struct *struct_type,
	200	unsigned long index)
	201	{
	202	return &g_array_index(struct_type->fields, struct type_field, index);
	203	}
	204
	205	/*
	206	* field returned only valid as long as the field structure is not appended to.
	207	*/
	208	struct field *
	209	struct_definition_get_field_from_index(struct definition_struct *_struct,
	210	unsigned long index)
	211	{
	212	return &g_array_index(_struct->fields, struct field, index);
	213	}