types/float.c

   1 /*
   2  * float.c
   3  *
   4  * BabelTrace - Float Type Converter
   5  *
   6  * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
   7  *
   8  * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  */
  20
  21 #include <babeltrace/compiler.h>
  22 #include <babeltrace/format.h>
  23 #include <babeltrace/types.h>
  24 #include <babeltrace/endian.h>
  25
  26 static
  27 struct definition *_float_definition_new(struct declaration *declaration,
  28                                    struct definition_scope *parent_scope,
  29                                    GQuark field_name, int index,
  30                                    const char *root_name);
  31 static
  32 void _float_definition_free(struct definition *definition);
  33
  34 static
  35 void _float_declaration_free(struct declaration *declaration)
  36 {
  37         struct declaration_float *float_declaration =
  38                 container_of(declaration, struct declaration_float, p);
  39
  40         declaration_unref(&float_declaration->exp->p);
  41         declaration_unref(&float_declaration->mantissa->p);
  42         declaration_unref(&float_declaration->sign->p);
  43         g_free(float_declaration);
  44 }
  45
  46 struct declaration_float *
  47         float_declaration_new(size_t mantissa_len,
  48                        size_t exp_len, int byte_order, size_t alignment)
  49 {
  50         struct declaration_float *float_declaration;
  51         struct declaration *declaration;
  52
  53         float_declaration = g_new(struct declaration_float, 1);
  54         declaration = &float_declaration->p;
  55         declaration->id = CTF_TYPE_FLOAT;
  56         declaration->alignment = alignment;
  57         declaration->declaration_free = _float_declaration_free;
  58         declaration->definition_new = _float_definition_new;
  59         declaration->definition_free = _float_definition_free;
  60         declaration->ref = 1;
  61         float_declaration->byte_order = byte_order;
  62
  63         float_declaration->sign = integer_declaration_new(1,
  64                                                 byte_order, false, 1, 2,
  65                                                 CTF_STRING_NONE, NULL);
  66         float_declaration->mantissa = integer_declaration_new(mantissa_len - 1,
  67                                                 byte_order, false, 1, 10,
  68                                                 CTF_STRING_NONE, NULL);
  69         float_declaration->exp = integer_declaration_new(exp_len,
  70                                                 byte_order, true, 1, 10,
  71                                                 CTF_STRING_NONE, NULL);
  72         return float_declaration;
  73 }
  74
  75 static
  76 struct definition *
  77         _float_definition_new(struct declaration *declaration,
  78                               struct definition_scope *parent_scope,
  79                               GQuark field_name, int index,
  80                               const char *root_name)
  81 {
  82         struct declaration_float *float_declaration =
  83                 container_of(declaration, struct declaration_float, p);
  84         struct definition_float *_float;
  85         struct definition *tmp;
  86         int ret;
  87
  88         _float = g_new(struct definition_float, 1);
  89         declaration_ref(&float_declaration->p);
  90         _float->p.declaration = declaration;
  91         _float->declaration = float_declaration;
  92         _float->p.scope = new_definition_scope(parent_scope, field_name, root_name);
  93         _float->p.path = new_definition_path(parent_scope, field_name, root_name);
  94         if (float_declaration->byte_order == LITTLE_ENDIAN) {
  95                 tmp = float_declaration->mantissa->p.definition_new(&float_declaration->mantissa->p,
  96                         _float->p.scope, g_quark_from_static_string("mantissa"), 0, NULL);
  97                 _float->mantissa = container_of(tmp, struct definition_integer, p);
  98                 tmp = float_declaration->exp->p.definition_new(&float_declaration->exp->p,
  99                         _float->p.scope, g_quark_from_static_string("exp"), 1, NULL);
 100                 _float->exp = container_of(tmp, struct definition_integer, p);
 101                 tmp = float_declaration->sign->p.definition_new(&float_declaration->sign->p,
 102                         _float->p.scope, g_quark_from_static_string("sign"), 2, NULL);
 103                 _float->sign = container_of(tmp, struct definition_integer, p);
 104         } else {
 105                 tmp = float_declaration->sign->p.definition_new(&float_declaration->sign->p,
 106                         _float->p.scope, g_quark_from_static_string("sign"), 0, NULL);
 107                 _float->sign = container_of(tmp, struct definition_integer, p);
 108                 tmp = float_declaration->exp->p.definition_new(&float_declaration->exp->p,
 109                         _float->p.scope, g_quark_from_static_string("exp"), 1, NULL);
 110                 _float->exp = container_of(tmp, struct definition_integer, p);
 111                 tmp = float_declaration->mantissa->p.definition_new(&float_declaration->mantissa->p,
 112                         _float->p.scope, g_quark_from_static_string("mantissa"), 2, NULL);
 113                 _float->mantissa = container_of(tmp, struct definition_integer, p);
 114         }
 115         _float->p.ref = 1;
 116         /*
 117          * Use INT_MAX order to ensure that all fields of the parent
 118          * scope are seen as being prior to this scope.
 119          */
 120         _float->p.index = root_name ? INT_MAX : index;
 121         _float->p.name = field_name;
 122         _float->value = 0.0;
 123         if (parent_scope) {
 124                 ret = register_field_definition(field_name, &_float->p,
 125                                                 parent_scope);
 126                 assert(!ret);
 127         }
 128         return &_float->p;
 129 }
 130
 131 static
 132 void _float_definition_free(struct definition *definition)
 133 {
 134         struct definition_float *_float =
 135                 container_of(definition, struct definition_float, p);
 136
 137         definition_unref(&_float->sign->p);
 138         definition_unref(&_float->exp->p);
 139         definition_unref(&_float->mantissa->p);
 140         free_definition_scope(_float->p.scope);
 141         declaration_unref(_float->p.declaration);
 142         g_free(_float);
 143 }