gdb/rust-lang.h

   1 /* Rust language support definitions for GDB, the GNU debugger.
   2
   3    Copyright (C) 2016-2023 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 RUST_LANG_H
  21 #define RUST_LANG_H
  22
  23 #include "demangle.h"
  24 #include "language.h"
  25 #include "value.h"
  26 #include "c-lang.h"
  27
  28 struct parser_state;
  29 struct type;
  30
  31 /* Return true if TYPE is a tuple type; otherwise false.  */
  32 extern bool rust_tuple_type_p (struct type *type);
  33
  34 /* Return true if TYPE is a tuple struct type; otherwise false.  */
  35 extern bool rust_tuple_struct_type_p (struct type *type);
  36
  37 /* Return true if TYPE is a slice type, otherwise false.  */
  38 extern bool rust_slice_type_p (const struct type *type);
  39
  40 /* Given a block, find the name of the block's crate. Returns an empty
  41    stringif no crate name can be found.  */
  42 extern std::string rust_crate_for_block (const struct block *block);
  43
  44 /* Returns the last segment of a Rust path like foo::bar::baz.  Will
  45    not handle cases where the last segment contains generics.  */
  46
  47 extern const char *rust_last_path_segment (const char *path);
  48
  49 /* Create a new slice type.  NAME is the name of the type.  ELT_TYPE
  50    is the type of the elements of the slice.  USIZE_TYPE is the Rust
  51    "usize" type to use.  The new type is allocated whereever ELT_TYPE
  52    is allocated.  */
  53 extern struct type *rust_slice_type (const char *name, struct type *elt_type,
  54                                      struct type *usize_type);
  55
  56 /* Return a new array that holds the contents of the given slice,
  57    VAL.  */
  58 extern struct value *rust_slice_to_array (struct value *val);
  59
  60 /* Class representing the Rust language.  */
  61
  62 class rust_language : public language_defn
  63 {
  64 public:
  65   rust_language ()
  66     : language_defn (language_rust)
  67   { /* Nothing.  */ }
  68
  69   /* See language.h.  */
  70
  71   const char *name () const override
  72   { return "rust"; }
  73
  74   /* See language.h.  */
  75
  76   const char *natural_name () const override
  77   { return "Rust"; }
  78
  79   /* See language.h.  */
  80
  81   const char *get_digit_separator () const override
  82   { return "_"; }
  83
  84   /* See language.h.  */
  85
  86   const std::vector<const char *> &filename_extensions () const override
  87   {
  88     static const std::vector<const char *> extensions = { ".rs" };
  89     return extensions;
  90   }
  91
  92   /* See language.h.  */
  93
  94   void language_arch_info (struct gdbarch *gdbarch,
  95                            struct language_arch_info *lai) const override;
  96
  97   /* See language.h.  */
  98
  99   bool sniff_from_mangled_name
 100        (const char *mangled, gdb::unique_xmalloc_ptr<char> *demangled)
 101        const override
 102   {
 103     demangled->reset (rust_demangle (mangled, 0));
 104     return *demangled != NULL;
 105   }
 106
 107   /* See language.h.  */
 108
 109   gdb::unique_xmalloc_ptr<char> demangle_symbol (const char *mangled,
 110                                                  int options) const override
 111   {
 112     return gdb::unique_xmalloc_ptr<char> (rust_demangle (mangled, options));
 113   }
 114
 115   /* See language.h.  */
 116
 117   bool can_print_type_offsets () const override
 118   {
 119     return true;
 120   }
 121
 122   /* See language.h.  */
 123
 124   void print_type (struct type *type, const char *varstring,
 125                    struct ui_file *stream, int show, int level,
 126                    const struct type_print_options *flags) const override;
 127
 128   /* See language.h.  */
 129
 130   gdb::unique_xmalloc_ptr<char> watch_location_expression
 131         (struct type *type, CORE_ADDR addr) const override
 132   {
 133     type = check_typedef (check_typedef (type)->target_type ());
 134     std::string name = type_to_string (type);
 135     return xstrprintf ("*(%s as *mut %s)", core_addr_to_string (addr),
 136                        name.c_str ());
 137   }
 138
 139   /* See language.h.  */
 140
 141   void value_print_inner
 142         (struct value *val, struct ui_file *stream, int recurse,
 143          const struct value_print_options *options) const override;
 144
 145   /* See language.h.  */
 146
 147   void value_print (struct value *val, struct ui_file *stream,
 148                     const struct value_print_options *options) const override;
 149
 150   /* See language.h.  */
 151
 152   struct block_symbol lookup_symbol_nonlocal
 153         (const char *name, const struct block *block,
 154          const domain_enum domain) const override;
 155
 156   /* See language.h.  */
 157
 158   int parser (struct parser_state *ps) const override;
 159
 160   /* See language.h.  */
 161
 162   void emitchar (int ch, struct type *chtype,
 163                  struct ui_file *stream, int quoter) const override;
 164
 165   /* See language.h.  */
 166
 167   void printchar (int ch, struct type *chtype,
 168                   struct ui_file *stream) const override
 169   {
 170     gdb_puts ("'", stream);
 171     emitchar (ch, chtype, stream, '\'');
 172     gdb_puts ("'", stream);
 173   }
 174
 175   /* See language.h.  */
 176
 177   void printstr (struct ui_file *stream, struct type *elttype,
 178                  const gdb_byte *string, unsigned int length,
 179                  const char *encoding, int force_ellipses,
 180                  const struct value_print_options *options) const override;
 181
 182   /* See language.h.  */
 183
 184   void print_typedef (struct type *type, struct symbol *new_symbol,
 185                       struct ui_file *stream) const override
 186   {
 187     type = check_typedef (type);
 188     gdb_printf (stream, "type %s = ", new_symbol->print_name ());
 189     type_print (type, "", stream, 0);
 190     gdb_printf (stream, ";");
 191   }
 192
 193   /* See language.h.  */
 194
 195   bool is_string_type_p (struct type *type) const override;
 196
 197   /* See language.h.  */
 198
 199   bool is_array_like (struct type *type) const override
 200   { return rust_slice_type_p (type); }
 201
 202   /* See language.h.  */
 203
 204   struct value *to_array (struct value *val) const override
 205   { return rust_slice_to_array (val); }
 206
 207   /* See language.h.  */
 208
 209   bool range_checking_on_by_default () const override
 210   { return true; }
 211
 212 private:
 213
 214   /* Helper for value_print_inner, arguments are as for that function.
 215      Prints structs and untagged unions.  */
 216
 217   void val_print_struct (struct value *val, struct ui_file *stream,
 218                          int recurse,
 219                          const struct value_print_options *options) const;
 220
 221   /* Helper for value_print_inner, arguments are as for that function.
 222      Prints discriminated unions (Rust enums).  */
 223
 224   void print_enum (struct value *val, struct ui_file *stream, int recurse,
 225                    const struct value_print_options *options) const;
 226 };
 227
 228 #endif /* RUST_LANG_H */