gdb/p-lang.h

   1 /* Pascal language support definitions for GDB, the GNU debugger.
   2
   3    Copyright (C) 2000-2021 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef P_LANG_H
  21 #define P_LANG_H
  22
  23 /* This file is derived from c-lang.h */
  24
  25 struct value;
  26 struct parser_state;
  27
  28 /* Determines if type TYPE is a pascal string type.  Returns a positive
  29    value if the type is a known pascal string type.  This function is used
  30    by p-valprint.c code to allow better string display.  If it is a pascal
  31    string type, then it also sets info needed to get the length and the
  32    data of the string length_pos, length_size and string_pos are given in
  33    bytes.  char_size gives the element size in bytes.  FIXME: if the
  34    position or the size of these fields are not multiple of TARGET_CHAR_BIT
  35    then the results are wrong but this does not happen for Free Pascal nor
  36    for GPC.  */
  37
  38 extern int pascal_is_string_type (struct type *type,int *length_pos,
  39                                   int *length_size, int *string_pos,
  40                                   struct type **char_type,
  41                                   const char **arrayname);
  42
  43 /* Defined in p-lang.c */
  44
  45 extern const char *pascal_main_name (void);
  46
  47 /* These are in p-lang.c: */
  48
  49 extern int is_pascal_string_type (struct type *, int *, int *, int *,
  50                                   struct type **, const char **);
  51
  52 extern int pascal_object_is_vtbl_ptr_type (struct type *);
  53
  54 extern int pascal_object_is_vtbl_member (struct type *);
  55
  56 /* Class representing the Pascal language.  */
  57
  58 class pascal_language : public language_defn
  59 {
  60 public:
  61   pascal_language ()
  62     : language_defn (language_pascal)
  63   { /* Nothing.  */ }
  64
  65   /* See language.h.  */
  66
  67   const char *name () const override
  68   { return "pascal"; }
  69
  70   /* See language.h.  */
  71
  72   const char *natural_name () const override
  73   { return "Pascal"; }
  74
  75   /* See language.h.  */
  76
  77   const std::vector<const char *> &filename_extensions () const override
  78   {
  79     static const std::vector<const char *> extensions
  80       = { ".pas", ".p", ".pp" };
  81     return extensions;
  82   }
  83
  84   /* See language.h.  */
  85
  86   void language_arch_info (struct gdbarch *gdbarch,
  87                            struct language_arch_info *lai) const override;
  88
  89   /* See language.h.  */
  90
  91   void print_type (struct type *type, const char *varstring,
  92                    struct ui_file *stream, int show, int level,
  93                    const struct type_print_options *flags) const override;
  94
  95   /* See language.h.  */
  96
  97   void value_print (struct value *val, struct ui_file *stream,
  98                     const struct value_print_options *options) const override;
  99
 100   /* See language.h.  */
 101
 102   void value_print_inner
 103         (struct value *val, struct ui_file *stream, int recurse,
 104          const struct value_print_options *options) const override;
 105
 106   /* See language.h.  */
 107
 108   int parser (struct parser_state *ps) const override;
 109
 110   /* See language.h.  */
 111
 112   void emitchar (int ch, struct type *chtype,
 113                  struct ui_file *stream, int quoter) const override
 114   {
 115     int in_quotes = 0;
 116
 117     print_one_char (ch, stream, &in_quotes);
 118     if (in_quotes)
 119       fputs_filtered ("'", stream);
 120   }
 121
 122   /* See language.h.  */
 123
 124   void printchar (int ch, struct type *chtype,
 125                   struct ui_file *stream) const override;
 126
 127   /* See language.h.  */
 128
 129   void printstr (struct ui_file *stream, struct type *elttype,
 130                  const gdb_byte *string, unsigned int length,
 131                  const char *encoding, int force_ellipses,
 132                  const struct value_print_options *options) const override;
 133
 134   /* See language.h.  */
 135
 136   void print_typedef (struct type *type, struct symbol *new_symbol,
 137                       struct ui_file *stream) const override;
 138
 139   /* See language.h.  */
 140
 141   bool is_string_type_p (struct type *type) const override
 142   {
 143     return pascal_is_string_type(type, nullptr, nullptr, nullptr,
 144                                  nullptr, nullptr) > 0;
 145   }
 146
 147   /* See language.h.  */
 148
 149   const char *name_of_this () const override
 150   { return "this"; }
 151
 152   /* See language.h.  */
 153
 154   bool range_checking_on_by_default () const override
 155   { return true; }
 156
 157 private:
 158
 159   /* Print the character C on STREAM as part of the contents of a literal
 160      string.  IN_QUOTES is reset to 0 if a char is written with #4 notation.  */
 161
 162   void print_one_char (int c, struct ui_file *stream, int *in_quotes) const;
 163
 164   /* Print the name of the type (or the ultimate pointer target,
 165      function value or array element), or the description of a
 166      structure or union.
 167
 168      SHOW positive means print details about the type (e.g. enum values),
 169      and print structure elements passing SHOW - 1 for show.  SHOW negative
 170      means just print the type name or struct tag if there is one.  If
 171      there is no name, print something sensible but concise like "struct
 172      {...}".
 173      SHOW zero means just print the type name or struct tag if there is one.
 174      If there is no name, print something sensible but not as concise like
 175      "struct {int x; int y;}".
 176
 177      LEVEL is the number of spaces to indent by.
 178      We increase it for some recursive calls.  */
 179
 180   void type_print_base (struct type *type, struct ui_file *stream, int show,
 181                         int level,
 182                         const struct type_print_options *flags) const;
 183
 184
 185   /* Print any array sizes, function arguments or close parentheses
 186      needed after the variable name (to describe its type).
 187      Args work like pascal_type_print_varspec_prefix.  */
 188
 189   void type_print_varspec_suffix (struct type *type, struct ui_file *stream,
 190                                   int show, int passed_a_ptr,
 191                                   int demangled_args,
 192                                   const struct type_print_options *flags) const;
 193
 194   /* Helper for pascal_language::type_print_varspec_suffix to print the
 195      suffix of a function or method.  */
 196
 197   void type_print_func_varspec_suffix
 198         (struct type *type, struct ui_file *stream, int show,
 199          int passed_a_ptr, int demangled_args,
 200          const struct type_print_options *flags) const;
 201
 202   /* Print any asterisks or open-parentheses needed before the
 203      variable name (to describe its type).
 204
 205      On outermost call, pass 0 for PASSED_A_PTR.
 206      On outermost call, SHOW > 0 means should ignore
 207      any typename for TYPE and show its details.
 208      SHOW is always zero on recursive calls.  */
 209
 210   void type_print_varspec_prefix
 211         (struct type *type, struct ui_file *stream, int show,
 212          int passed_a_ptr, const struct type_print_options *flags) const;
 213
 214   /* Print the function args from TYPE (a TYPE_CODE_FUNC) to STREAM taking
 215      FLAGS into account where appropriate.  */
 216
 217   void  print_func_args (struct type *type, struct ui_file *stream,
 218                          const struct type_print_options *flags) const;
 219
 220   /* Print the Pascal method arguments for PHYSNAME and METHODNAME to the
 221      file STREAM.  */
 222
 223   void type_print_method_args (const char *physname, const char *methodname,
 224                                struct ui_file *stream) const;
 225
 226   /* If TYPE is a derived type, then print out derivation information.
 227      Print only the actual base classes of this type, not the base classes
 228      of the base classes.  I.e. for the derivation hierarchy:
 229
 230      class A { int a; };
 231      class B : public A {int b; };
 232      class C : public B {int c; };
 233
 234      Print the type of class C as:
 235
 236      class C : public B {
 237      int c;
 238      }
 239
 240      Not as the following (like gdb used to), which is not legal C++ syntax
 241      for derived types and may be confused with the multiple inheritance
 242      form:
 243
 244      class C : public B : public A {
 245      int c;
 246      }
 247
 248      In general, gdb should try to print the types as closely as possible
 249      to the form that they appear in the source code.  */
 250
 251   void type_print_derivation_info (struct ui_file *stream,
 252                                    struct type *type) const;
 253 };
 254
 255 #endif /* P_LANG_H */