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
  22 static
  23 struct definition *_float_definition_new(struct declaration *declaration,
  24                                    struct definition_scope *parent_scope,
  25                                    GQuark field_name, int index);
  26 static
  27 void _float_definition_free(struct definition *definition);
  28
  29 void float_copy(struct stream_pos *destp,
  30                 const struct format *fdest,
  31                 struct stream_pos *srcp,
  32                 const struct format *fsrc,
  33                 struct definition *definition)
  34 {
  35         struct definition_float *_float =
  36                 container_of(definition, struct definition_float, p);
  37         struct declaration_float *float_declaration = _float->declaration;
  38
  39         if (fsrc->float_copy == fdest->float_copy) {
  40                 fsrc->float_copy(destp, srcp, float_declaration);
  41         } else {
  42                 double v;
  43
  44                 v = fsrc->double_read(srcp, float_declaration);
  45                 fdest->double_write(destp, float_declaration, v);
  46         }
  47 }
  48
  49 static
  50 void _float_declaration_free(struct declaration *declaration)
  51 {
  52         struct declaration_float *float_declaration =
  53                 container_of(declaration, struct declaration_float, p);
  54
  55         declaration_unref(&float_declaration->exp->p);
  56         declaration_unref(&float_declaration->mantissa->p);
  57         declaration_unref(&float_declaration->sign->p);
  58         g_free(float_declaration);
  59 }
  60
  61 struct declaration_float *
  62         float_declaration_new(size_t mantissa_len,
  63                        size_t exp_len, int byte_order, size_t alignment)
  64 {
  65         struct declaration_float *float_declaration;
  66         struct declaration *declaration;
  67
  68         float_declaration = g_new(struct declaration_float, 1);
  69         declaration = &float_declaration->p;
  70         declaration->id = CTF_TYPE_FLOAT;
  71         declaration->alignment = alignment;
  72         declaration->copy = float_copy;
  73         declaration->declaration_free = _float_declaration_free;
  74         declaration->definition_new = _float_definition_new;
  75         declaration->definition_free = _float_definition_free;
  76         declaration->ref = 1;
  77         float_declaration->byte_order = byte_order;
  78
  79         float_declaration->sign = integer_declaration_new(1,
  80                                             byte_order, false, 1);
  81         float_declaration->mantissa = integer_declaration_new(mantissa_len - 1,
  82                                                 byte_order, false, 1);
  83         float_declaration->exp = integer_declaration_new(exp_len,
  84                                            byte_order, true, 1);
  85         return float_declaration;
  86 }
  87
  88 static
  89 struct definition *
  90         _float_definition_new(struct declaration *declaration,
  91                               struct definition_scope *parent_scope,
  92                               GQuark field_name, int index)
  93 {
  94         struct declaration_float *float_declaration =
  95                 container_of(declaration, struct declaration_float, p);
  96         struct definition_float *_float;
  97
  98         _float = g_new(struct definition_float, 1);
  99         declaration_ref(&float_declaration->p);
 100         _float->p.declaration = declaration;
 101         _float->declaration = float_declaration;
 102         _float->p.ref = 1;
 103         _float->p.index = index;
 104         _float->value = 0.0;
 105         return &_float->p;
 106 }
 107
 108 static
 109 void _float_definition_free(struct definition *definition)
 110 {
 111         struct definition_float *_float =
 112                 container_of(definition, struct definition_float, p);
 113
 114         declaration_unref(_float->p.declaration);
 115         g_free(_float);
 116 }