types/sequence.c

   1 /*
   2  * sequence.c
   3  *
   4  * BabelTrace - Sequence 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 *_sequence_definition_new(struct declaration *declaration,
  28                                         struct definition_scope *parent_scope,
  29                                         GQuark field_name, int index);
  30 static
  31 void _sequence_definition_free(struct definition *definition);
  32
  33 void sequence_copy(struct stream_pos *dest, const struct format *fdest,
  34                    struct stream_pos *src, const struct format *fsrc,
  35                    struct definition *definition)
  36 {
  37         struct definition_sequence *sequence =
  38                 container_of(definition, struct definition_sequence, p);
  39         struct declaration_sequence *sequence_declaration = sequence->declaration;
  40         uint64_t i;
  41
  42         fsrc->sequence_begin(src, sequence_declaration);
  43         fdest->sequence_begin(dest, sequence_declaration);
  44
  45         sequence->len->p.declaration->copy(dest, fdest, src, fsrc,
  46                                     &sequence->len->p);
  47
  48         for (i = 0; i < sequence->len->value._unsigned; i++) {
  49                 struct definition *elem =
  50                         sequence->current_element.definition;
  51                 elem->declaration->copy(dest, fdest, src, fsrc, elem);
  52         }
  53         fsrc->sequence_end(src, sequence_declaration);
  54         fdest->sequence_end(dest, sequence_declaration);
  55 }
  56
  57 static
  58 void _sequence_declaration_free(struct declaration *declaration)
  59 {
  60         struct declaration_sequence *sequence_declaration =
  61                 container_of(declaration, struct declaration_sequence, p);
  62
  63         free_declaration_scope(sequence_declaration->scope);
  64         declaration_unref(&sequence_declaration->len_declaration->p);
  65         declaration_unref(sequence_declaration->elem);
  66         g_free(sequence_declaration);
  67 }
  68
  69 struct declaration_sequence *
  70         sequence_declaration_new(struct declaration_integer *len_declaration,
  71                           struct declaration *elem_declaration,
  72                           struct declaration_scope *parent_scope)
  73 {
  74         struct declaration_sequence *sequence_declaration;
  75         struct declaration *declaration;
  76
  77         sequence_declaration = g_new(struct declaration_sequence, 1);
  78         declaration = &sequence_declaration->p;
  79         assert(!len_declaration->signedness);
  80         declaration_ref(&len_declaration->p);
  81         sequence_declaration->len_declaration = len_declaration;
  82         declaration_ref(elem_declaration);
  83         sequence_declaration->elem = elem_declaration;
  84         sequence_declaration->scope = new_declaration_scope(parent_scope);
  85         declaration->id = CTF_TYPE_SEQUENCE;
  86         declaration->alignment = max(len_declaration->p.alignment, elem_declaration->alignment);
  87         declaration->copy = sequence_copy;
  88         declaration->declaration_free = _sequence_declaration_free;
  89         declaration->definition_new = _sequence_definition_new;
  90         declaration->definition_free = _sequence_definition_free;
  91         declaration->ref = 1;
  92         return sequence_declaration;
  93 }
  94
  95 static
  96 struct definition *_sequence_definition_new(struct declaration *declaration,
  97                                 struct definition_scope *parent_scope,
  98                                 GQuark field_name, int index)
  99 {
 100         struct declaration_sequence *sequence_declaration =
 101                 container_of(declaration, struct declaration_sequence, p);
 102         struct definition_sequence *sequence;
 103         struct definition *len_parent;
 104
 105         sequence = g_new(struct definition_sequence, 1);
 106         declaration_ref(&sequence_declaration->p);
 107         sequence->p.declaration = declaration;
 108         sequence->declaration = sequence_declaration;
 109         sequence->p.ref = 1;
 110         sequence->p.index = index;
 111         sequence->scope = new_definition_scope(parent_scope, field_name);
 112         len_parent = sequence_declaration->len_declaration->p.definition_new(&sequence_declaration->len_declaration->p,
 113                                 parent_scope,
 114                                 g_quark_from_static_string("length"), 0);
 115         sequence->len =
 116                 container_of(len_parent, struct definition_integer, p);
 117         sequence->current_element.definition =
 118                 sequence_declaration->elem->definition_new(sequence_declaration->elem,
 119                                 parent_scope,
 120                                 g_quark_from_static_string("[]"), 1);
 121         return &sequence->p;
 122 }
 123
 124 static
 125 void _sequence_definition_free(struct definition *definition)
 126 {
 127         struct definition_sequence *sequence =
 128                 container_of(definition, struct definition_sequence, p);
 129         struct definition *len_definition = &sequence->len->p;
 130         struct definition *elem_definition =
 131                 sequence->current_element.definition;
 132
 133         len_definition->declaration->definition_free(len_definition);
 134         elem_definition->declaration->definition_free(elem_definition);
 135         free_definition_scope(sequence->scope);
 136         declaration_unref(sequence->p.declaration);
 137         g_free(sequence);
 138 }