Unref: handle null pointers

[babeltrace.git] / types / array.c

/*
 * array.c
 *
 * BabelTrace - Array 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>

static
struct definition *_array_definition_new(struct declaration *declaration,
			struct definition_scope *parent_scope,
			GQuark field_name, int index);
static
void _array_definition_free(struct definition *definition);

void array_copy(struct stream_pos *dest, const struct format *fdest, 
		struct stream_pos *src, const struct format *fsrc,
		struct definition *definition)
{
	struct definition_array *array =
		container_of(definition, struct definition_array, p);
	struct declaration_array *array_declaration = array->declaration;
	uint64_t i;

	fsrc->array_begin(src, array_declaration);
	fdest->array_begin(dest, array_declaration);

	for (i = 0; i < array_declaration->len; i++) {
		struct definition *elem = array->current_element.definition;
		elem->declaration->copy(dest, fdest, src, fsrc, elem);
	}
	fsrc->array_end(src, array_declaration);
	fdest->array_end(dest, array_declaration);
}

static
void _array_declaration_free(struct declaration *declaration)
{
	struct declaration_array *array_declaration =
		container_of(declaration, struct declaration_array, p);

	free_declaration_scope(array_declaration->scope);
	declaration_unref(array_declaration->elem);
	g_free(array_declaration);
}

struct declaration_array *
	array_declaration_new(size_t len,
			      struct declaration *elem_declaration,
			      struct declaration_scope *parent_scope)
{
	struct declaration_array *array_declaration;
	struct declaration *declaration;

	array_declaration = g_new(struct declaration_array, 1);
	declaration = &array_declaration->p;
	array_declaration->len = len;
	declaration_ref(elem_declaration);
	array_declaration->elem = elem_declaration;
	array_declaration->scope = new_declaration_scope(parent_scope);
	declaration->id = CTF_TYPE_ARRAY;
	/* No need to align the array, the first element will align itself */
	declaration->alignment = 1;
	declaration->copy = array_copy;
	declaration->declaration_free = _array_declaration_free;
	declaration->definition_new = _array_definition_new;
	declaration->definition_free = _array_definition_free;
	declaration->ref = 1;
	return array_declaration;
}

static
struct definition *
	_array_definition_new(struct declaration *declaration,
			      struct definition_scope *parent_scope,
			      GQuark field_name, int index)
{
	struct declaration_array *array_declaration =
		container_of(declaration, struct declaration_array, p);
	struct definition_array *array;

	array = g_new(struct definition_array, 1);
	declaration_ref(&array_declaration->p);
	array->p.declaration = declaration;
	array->declaration = array_declaration;
	array->p.ref = 1;
	array->p.index = index;
	array->scope = new_definition_scope(parent_scope, field_name);
	array->current_element.definition =
		array_declaration->elem->definition_new(array_declaration->elem,
					  parent_scope,
					  g_quark_from_static_string("[]"),
					  0);
	return &array->p;
}

static
void _array_definition_free(struct definition *definition)
{
	struct definition_array *array =
		container_of(definition, struct definition_array, p);
	struct definition *elem_definition =
		array->current_element.definition;

	elem_definition->declaration->definition_free(elem_definition);
	free_definition_scope(array->scope);
	declaration_unref(array->p.declaration);
	g_free(array);
}