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1 /* Definitions and declarations for stor-layout.c.
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2 Copyright (C) 2013-2018 Free Software Foundation, Inc.
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111
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef GCC_STOR_LAYOUT_H
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21 #define GCC_STOR_LAYOUT_H
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22
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23 extern void set_min_and_max_values_for_integral_type (tree, int, signop);
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24 extern void fixup_signed_type (tree);
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25 extern unsigned int update_alignment_for_field (record_layout_info, tree,
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26 unsigned int);
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27 extern record_layout_info start_record_layout (tree);
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28 extern tree bit_from_pos (tree, tree);
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29 extern tree byte_from_pos (tree, tree);
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30 extern void pos_from_bit (tree *, tree *, unsigned int, tree);
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31 extern void normalize_offset (tree *, tree *, unsigned int);
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32 extern tree rli_size_unit_so_far (record_layout_info);
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33 extern tree rli_size_so_far (record_layout_info);
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34 extern void normalize_rli (record_layout_info);
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35 extern void place_field (record_layout_info, tree);
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36 extern void compute_record_mode (tree);
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37 extern void finish_bitfield_layout (tree);
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38 extern void finish_record_layout (record_layout_info, int);
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39 extern unsigned int element_precision (const_tree);
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40 extern void finalize_size_functions (void);
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41 extern void fixup_unsigned_type (tree);
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42 extern void initialize_sizetypes (void);
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43
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44 /* Finish up a builtin RECORD_TYPE. Give it a name and provide its
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45 fields. Optionally specify an alignment, and then lay it out. */
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46 extern void finish_builtin_struct (tree, const char *, tree, tree);
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47
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48 /* Given a VAR_DECL, PARM_DECL, RESULT_DECL or FIELD_DECL node,
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49 calculates the DECL_SIZE, DECL_SIZE_UNIT, DECL_ALIGN and DECL_MODE
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50 fields. Call this only once for any given decl node.
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51
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52 Second argument is the boundary that this field can be assumed to
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53 be starting at (in bits). Zero means it can be assumed aligned
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54 on any boundary that may be needed. */
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55 extern void layout_decl (tree, unsigned);
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56
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57 /* Given a ..._TYPE node, calculate the TYPE_SIZE, TYPE_SIZE_UNIT,
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58 TYPE_ALIGN and TYPE_MODE fields. If called more than once on one
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59 node, does nothing except for the first time. */
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60 extern void layout_type (tree);
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61
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62 /* Return the least alignment in bytes required for type TYPE. */
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63 extern unsigned int min_align_of_type (tree);
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64
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65 /* Construct various nodes representing fract or accum data types. */
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66 extern tree make_fract_type (int, int, int);
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67 extern tree make_accum_type (int, int, int);
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68
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69 #define make_signed_fract_type(P) make_fract_type (P, 0, 0)
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70 #define make_unsigned_fract_type(P) make_fract_type (P, 1, 0)
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71 #define make_sat_signed_fract_type(P) make_fract_type (P, 0, 1)
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72 #define make_sat_unsigned_fract_type(P) make_fract_type (P, 1, 1)
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73 #define make_signed_accum_type(P) make_accum_type (P, 0, 0)
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74 #define make_unsigned_accum_type(P) make_accum_type (P, 1, 0)
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75 #define make_sat_signed_accum_type(P) make_accum_type (P, 0, 1)
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76 #define make_sat_unsigned_accum_type(P) make_accum_type (P, 1, 1)
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77
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78 #define make_or_reuse_signed_fract_type(P) \
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79 make_or_reuse_fract_type (P, 0, 0)
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80 #define make_or_reuse_unsigned_fract_type(P) \
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81 make_or_reuse_fract_type (P, 1, 0)
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82 #define make_or_reuse_sat_signed_fract_type(P) \
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83 make_or_reuse_fract_type (P, 0, 1)
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84 #define make_or_reuse_sat_unsigned_fract_type(P) \
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85 make_or_reuse_fract_type (P, 1, 1)
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86 #define make_or_reuse_signed_accum_type(P) \
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87 make_or_reuse_accum_type (P, 0, 0)
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88 #define make_or_reuse_unsigned_accum_type(P) \
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89 make_or_reuse_accum_type (P, 1, 0)
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90 #define make_or_reuse_sat_signed_accum_type(P) \
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91 make_or_reuse_accum_type (P, 0, 1)
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92 #define make_or_reuse_sat_unsigned_accum_type(P) \
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93 make_or_reuse_accum_type (P, 1, 1)
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94
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95 extern tree make_signed_type (int);
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96 extern tree make_unsigned_type (int);
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97
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98 /* Return the mode for data of a given size SIZE and mode class CLASS.
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99 If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
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100 The value is BLKmode if no other mode is found. This is like
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101 mode_for_size, but is passed a tree. */
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102 extern opt_machine_mode mode_for_size_tree (const_tree, enum mode_class, int);
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103
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104 extern tree bitwise_type_for_mode (machine_mode);
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105
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106 /* Given a VAR_DECL, PARM_DECL or RESULT_DECL, clears the results of
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107 a previous call to layout_decl and calls it again. */
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108 extern void relayout_decl (tree);
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109
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110 /* variable_size (EXP) is like save_expr (EXP) except that it
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111 is for the special case of something that is part of a
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112 variable size for a data type. It makes special arrangements
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113 to compute the value at the right time when the data type
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114 belongs to a function parameter. */
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115 extern tree variable_size (tree);
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116
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117 #endif // GCC_STOR_LAYOUT_H
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