gdb/typeprint.h

   1 /* Language independent support for printing types for GDB, the GNU debugger.
   2    Copyright (C) 1986-2022 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef TYPEPRINT_H
  20 #define TYPEPRINT_H
  21
  22 #include "gdbsupport/gdb_obstack.h"
  23
  24 enum language;
  25 struct ui_file;
  26 struct typedef_hash_table;
  27 struct ext_lang_type_printers;
  28
  29 struct type_print_options
  30 {
  31   /* True means that no special printing flags should apply.  */
  32   unsigned int raw : 1;
  33
  34   /* True means print methods in a class.  */
  35   unsigned int print_methods : 1;
  36
  37   /* True means print typedefs in a class.  */
  38   unsigned int print_typedefs : 1;
  39
  40   /* True means to print offsets, a la 'pahole'.  */
  41   unsigned int print_offsets : 1;
  42
  43   /* True means to print offsets in hex, otherwise use decimal.  */
  44   unsigned int print_in_hex : 1;
  45
  46   /* The number of nested type definitions to print.  -1 == all.  */
  47   int print_nested_type_limit;
  48
  49   /* If not NULL, a local typedef hash table used when printing a
  50      type.  */
  51   typedef_hash_table *local_typedefs;
  52
  53   /* If not NULL, a global typedef hash table used when printing a
  54      type.  */
  55   typedef_hash_table *global_typedefs;
  56
  57   /* The list of type printers associated with the global typedef
  58      table.  This is intentionally opaque.  */
  59   struct ext_lang_type_printers *global_printers;
  60 };
  61
  62 struct print_offset_data
  63 {
  64   /* Indicate if the offset an d size fields should be printed in decimal
  65      (default) or hexadecimal.  */
  66   bool print_in_hex  = false;
  67
  68   /* The offset to be applied to bitpos when PRINT_OFFSETS is true.
  69      This is needed for when we are printing nested structs and want
  70      to make sure that the printed offset for each field carries over
  71      the offset of the outter struct.  */
  72   unsigned int offset_bitpos = 0;
  73
  74   /* END_BITPOS is the one-past-the-end bit position of the previous
  75      field (where we expect the current field to be if there is no
  76      hole).  */
  77   unsigned int end_bitpos = 0;
  78
  79   /* Print information about field at index FIELD_IDX of the struct type
  80      TYPE and update this object.
  81
  82      If the field is static, it simply prints the correct number of
  83      spaces.
  84
  85      The output is strongly based on pahole(1).  */
  86   void update (struct type *type, unsigned int field_idx,
  87                struct ui_file *stream);
  88
  89   /* Call when all fields have been printed.  This will print
  90      information about any padding that may exist.  LEVEL is the
  91      desired indentation level.  */
  92   void finish (struct type *type, int level, struct ui_file *stream);
  93
  94   /* When printing the offsets of a struct and its fields (i.e.,
  95      'ptype /o'; type_print_options::print_offsets), we use this many
  96      characters when printing the offset information at the beginning
  97      of the line.  This is needed in order to generate the correct
  98      amount of whitespaces when no offset info should be printed for a
  99      certain field.  */
 100   static const int indentation;
 101
 102   explicit print_offset_data (const struct type_print_options *flags);
 103
 104 private:
 105
 106   /* Helper function for ptype/o implementation that prints
 107      information about a hole, if necessary.  STREAM is where to
 108      print.  BITPOS is the bitpos of the current field.  FOR_WHAT is a
 109      string describing the purpose of the hole.  */
 110
 111   void maybe_print_hole (struct ui_file *stream, unsigned int bitpos,
 112                          const char *for_what);
 113 };
 114
 115 extern const struct type_print_options type_print_raw_options;
 116
 117 /* A hash table holding typedef_field objects.  This is more
 118    complicated than an ordinary hash because it must also track the
 119    lifetime of some -- but not all -- of the contained objects.  */
 120
 121 class typedef_hash_table
 122 {
 123 public:
 124
 125   /* Create a new typedef-lookup hash table.  */
 126   typedef_hash_table ();
 127
 128   /* Copy a typedef hash.  */
 129   typedef_hash_table (const typedef_hash_table &);
 130
 131   typedef_hash_table &operator= (const typedef_hash_table &) = delete;
 132
 133   /* Add typedefs from T to the hash table TABLE.  */
 134   void recursively_update (struct type *);
 135
 136   /* Add template parameters from T to the typedef hash TABLE.  */
 137   void add_template_parameters (struct type *t);
 138
 139   /* Look up the type T in the typedef hash tables contained in FLAGS.
 140      The local table is searched first, then the global table (either
 141      table can be NULL, in which case it is skipped).  If T is in a
 142      table, return its short (class-relative) typedef name.  Otherwise
 143      return NULL.  */
 144   static const char *find_typedef (const struct type_print_options *flags,
 145                                    struct type *t);
 146
 147 private:
 148
 149   static const char *find_global_typedef (const struct type_print_options *flags,
 150                                           struct type *t);
 151
 152
 153   /* The actual hash table.  */
 154   htab_up m_table;
 155
 156   /* Storage for typedef_field objects that must be synthesized.  */
 157   auto_obstack m_storage;
 158 };
 159
 160
 161 void print_type_scalar (struct type * type, LONGEST, struct ui_file *);
 162
 163 /* Assuming the TYPE is a fixed point type, print its type description
 164    on STREAM.  */
 165
 166 void print_type_fixed_point (struct type *type, struct ui_file *stream);
 167
 168 void c_type_print_args (struct type *, struct ui_file *, int, enum language,
 169                         const struct type_print_options *);
 170
 171 /* Print <unknown return type> to stream STREAM.  */
 172
 173 void type_print_unknown_return_type (struct ui_file *stream);
 174
 175 /* Throw an error indicating that the user tried to use a symbol that
 176    has unknown type.  SYM_PRINT_NAME is the name of the symbol, to be
 177    included in the error message.  */
 178 extern void error_unknown_type (const char *sym_print_name);
 179
 180 extern void val_print_not_allocated (struct ui_file *stream);
 181
 182 extern void val_print_not_associated (struct ui_file *stream);
 183
 184 #endif