types/float.c

   1 /*
   2  * float.c
   3  *
   4  * BabelTrace - Float 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 #include <endian.h>
  22
  23 static
  24 struct definition *_float_definition_new(struct declaration *declaration,
  25                                    struct definition_scope *parent_scope,
  26                                    GQuark field_name, int index,
  27                                    const char *root_name);
  28 static
  29 void _float_definition_free(struct definition *definition);
  30
  31 static
  32 void _float_declaration_free(struct declaration *declaration)
  33 {
  34         struct declaration_float *float_declaration =
  35                 container_of(declaration, struct declaration_float, p);
  36
  37         declaration_unref(&float_declaration->exp->p);
  38         declaration_unref(&float_declaration->mantissa->p);
  39         declaration_unref(&float_declaration->sign->p);
  40         g_free(float_declaration);
  41 }
  42
  43 struct declaration_float *
  44         float_declaration_new(size_t mantissa_len,
  45                        size_t exp_len, int byte_order, size_t alignment)
  46 {
  47         struct declaration_float *float_declaration;
  48         struct declaration *declaration;
  49
  50         float_declaration = g_new(struct declaration_float, 1);
  51         declaration = &float_declaration->p;
  52         declaration->id = CTF_TYPE_FLOAT;
  53         declaration->alignment = alignment;
  54         declaration->declaration_free = _float_declaration_free;
  55         declaration->definition_new = _float_definition_new;
  56         declaration->definition_free = _float_definition_free;
  57         declaration->ref = 1;
  58         float_declaration->byte_order = byte_order;
  59
  60         float_declaration->sign = integer_declaration_new(1,
  61                                                 byte_order, false, 1, 2,
  62                                                 CTF_STRING_NONE);
  63         float_declaration->mantissa = integer_declaration_new(mantissa_len - 1,
  64                                                 byte_order, false, 1, 10,
  65                                                 CTF_STRING_NONE);
  66         float_declaration->exp = integer_declaration_new(exp_len,
  67                                                 byte_order, true, 1, 10,
  68                                                 CTF_STRING_NONE);
  69         return float_declaration;
  70 }
  71
  72 static
  73 struct definition *
  74         _float_definition_new(struct declaration *declaration,
  75                               struct definition_scope *parent_scope,
  76                               GQuark field_name, int index,
  77                               const char *root_name)
  78 {
  79         struct declaration_float *float_declaration =
  80                 container_of(declaration, struct declaration_float, p);
  81         struct definition_float *_float;
  82         struct definition *tmp;
  83         int ret;
  84
  85         _float = g_new(struct definition_float, 1);
  86         declaration_ref(&float_declaration->p);
  87         _float->p.declaration = declaration;
  88         _float->declaration = float_declaration;
  89         _float->p.scope = new_definition_scope(parent_scope, field_name, root_name);
  90         _float->p.path = new_definition_path(parent_scope, field_name, root_name);
  91         if (float_declaration->byte_order == LITTLE_ENDIAN) {
  92                 tmp = float_declaration->mantissa->p.definition_new(&float_declaration->mantissa->p,
  93                         _float->p.scope, g_quark_from_static_string("mantissa"), 0, NULL);
  94                 _float->mantissa = container_of(tmp, struct definition_integer, p);
  95                 tmp = float_declaration->exp->p.definition_new(&float_declaration->exp->p,
  96                         _float->p.scope, g_quark_from_static_string("exp"), 1, NULL);
  97                 _float->exp = container_of(tmp, struct definition_integer, p);
  98                 tmp = float_declaration->sign->p.definition_new(&float_declaration->sign->p,
  99                         _float->p.scope, g_quark_from_static_string("sign"), 2, NULL);
 100                 _float->sign = container_of(tmp, struct definition_integer, p);
 101         } else {
 102                 tmp = float_declaration->sign->p.definition_new(&float_declaration->sign->p,
 103                         _float->p.scope, g_quark_from_static_string("sign"), 0, NULL);
 104                 _float->sign = container_of(tmp, struct definition_integer, p);
 105                 tmp = float_declaration->exp->p.definition_new(&float_declaration->exp->p,
 106                         _float->p.scope, g_quark_from_static_string("exp"), 1, NULL);
 107                 _float->exp = container_of(tmp, struct definition_integer, p);
 108                 tmp = float_declaration->mantissa->p.definition_new(&float_declaration->mantissa->p,
 109                         _float->p.scope, g_quark_from_static_string("mantissa"), 2, NULL);
 110                 _float->mantissa = container_of(tmp, struct definition_integer, p);
 111         }
 112         _float->p.ref = 1;
 113         /*
 114          * Use INT_MAX order to ensure that all fields of the parent
 115          * scope are seen as being prior to this scope.
 116          */
 117         _float->p.index = root_name ? INT_MAX : index;
 118         _float->p.name = field_name;
 119         _float->value = 0.0;
 120         ret = register_field_definition(field_name, &_float->p,
 121                                         parent_scope);
 122         assert(!ret);
 123         return &_float->p;
 124 }
 125
 126 static
 127 void _float_definition_free(struct definition *definition)
 128 {
 129         struct definition_float *_float =
 130                 container_of(definition, struct definition_float, p);
 131
 132         definition_unref(&_float->sign->p);
 133         definition_unref(&_float->exp->p);
 134         definition_unref(&_float->mantissa->p);
 135         free_definition_scope(_float->p.scope);
 136         declaration_unref(_float->p.declaration);
 137         g_free(_float);
 138 }