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 <endian.h>
  24
  25 static
  26 struct definition *_float_definition_new(struct declaration *declaration,
  27                                    struct definition_scope *parent_scope,
  28                                    GQuark field_name, int index,
  29                                    const char *root_name);
  30 static
  31 void _float_definition_free(struct definition *definition);
  32
  33 static
  34 void _float_declaration_free(struct declaration *declaration)
  35 {
  36         struct declaration_float *float_declaration =
  37                 container_of(declaration, struct declaration_float, p);
  38
  39         declaration_unref(&float_declaration->exp->p);
  40         declaration_unref(&float_declaration->mantissa->p);
  41         declaration_unref(&float_declaration->sign->p);
  42         g_free(float_declaration);
  43 }
  44
  45 struct declaration_float *
  46         float_declaration_new(size_t mantissa_len,
  47                        size_t exp_len, int byte_order, size_t alignment)
  48 {
  49         struct declaration_float *float_declaration;
  50         struct declaration *declaration;
  51
  52         float_declaration = g_new(struct declaration_float, 1);
  53         declaration = &float_declaration->p;
  54         declaration->id = CTF_TYPE_FLOAT;
  55         declaration->alignment = alignment;
  56         declaration->declaration_free = _float_declaration_free;
  57         declaration->definition_new = _float_definition_new;
  58         declaration->definition_free = _float_definition_free;
  59         declaration->ref = 1;
  60         float_declaration->byte_order = byte_order;
  61
  62         float_declaration->sign = integer_declaration_new(1,
  63                                                 byte_order, false, 1, 2,
  64                                                 CTF_STRING_NONE, NULL);
  65         float_declaration->mantissa = integer_declaration_new(mantissa_len - 1,
  66                                                 byte_order, false, 1, 10,
  67                                                 CTF_STRING_NONE, NULL);
  68         float_declaration->exp = integer_declaration_new(exp_len,
  69                                                 byte_order, true, 1, 10,
  70                                                 CTF_STRING_NONE, NULL);
  71         return float_declaration;
  72 }
  73
  74 static
  75 struct definition *
  76         _float_definition_new(struct declaration *declaration,
  77                               struct definition_scope *parent_scope,
  78                               GQuark field_name, int index,
  79                               const char *root_name)
  80 {
  81         struct declaration_float *float_declaration =
  82                 container_of(declaration, struct declaration_float, p);
  83         struct definition_float *_float;
  84         struct definition *tmp;
  85         int ret;
  86
  87         _float = g_new(struct definition_float, 1);
  88         declaration_ref(&float_declaration->p);
  89         _float->p.declaration = declaration;
  90         _float->declaration = float_declaration;
  91         _float->p.scope = new_definition_scope(parent_scope, field_name, root_name);
  92         _float->p.path = new_definition_path(parent_scope, field_name, root_name);
  93         if (float_declaration->byte_order == LITTLE_ENDIAN) {
  94                 tmp = float_declaration->mantissa->p.definition_new(&float_declaration->mantissa->p,
  95                         _float->p.scope, g_quark_from_static_string("mantissa"), 0, NULL);
  96                 _float->mantissa = container_of(tmp, struct definition_integer, p);
  97                 tmp = float_declaration->exp->p.definition_new(&float_declaration->exp->p,
  98                         _float->p.scope, g_quark_from_static_string("exp"), 1, NULL);
  99                 _float->exp = container_of(tmp, struct definition_integer, p);
 100                 tmp = float_declaration->sign->p.definition_new(&float_declaration->sign->p,
 101                         _float->p.scope, g_quark_from_static_string("sign"), 2, NULL);
 102                 _float->sign = container_of(tmp, struct definition_integer, p);
 103         } else {
 104                 tmp = float_declaration->sign->p.definition_new(&float_declaration->sign->p,
 105                         _float->p.scope, g_quark_from_static_string("sign"), 0, NULL);
 106                 _float->sign = container_of(tmp, struct definition_integer, p);
 107                 tmp = float_declaration->exp->p.definition_new(&float_declaration->exp->p,
 108                         _float->p.scope, g_quark_from_static_string("exp"), 1, NULL);
 109                 _float->exp = container_of(tmp, struct definition_integer, p);
 110                 tmp = float_declaration->mantissa->p.definition_new(&float_declaration->mantissa->p,
 111                         _float->p.scope, g_quark_from_static_string("mantissa"), 2, NULL);
 112                 _float->mantissa = container_of(tmp, struct definition_integer, p);
 113         }
 114         _float->p.ref = 1;
 115         /*
 116          * Use INT_MAX order to ensure that all fields of the parent
 117          * scope are seen as being prior to this scope.
 118          */
 119         _float->p.index = root_name ? INT_MAX : index;
 120         _float->p.name = field_name;
 121         _float->value = 0.0;
 122         if (parent_scope) {
 123                 ret = register_field_definition(field_name, &_float->p,
 124                                                 parent_scope);
 125                 assert(!ret);
 126         }
 127         return &_float->p;
 128 }
 129
 130 static
 131 void _float_definition_free(struct definition *definition)
 132 {
 133         struct definition_float *_float =
 134                 container_of(definition, struct definition_float, p);
 135
 136         definition_unref(&_float->sign->p);
 137         definition_unref(&_float->exp->p);
 138         definition_unref(&_float->mantissa->p);
 139         free_definition_scope(_float->p.scope);
 140         declaration_unref(_float->p.declaration);
 141         g_free(_float);
 142 }