gdb/rust-lang.h

   1 /* Rust language support definitions for GDB, the GNU debugger.
   2
   3    Copyright (C) 2016-2022 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 /* Given a block, find the name of the block's crate. Returns an empty
  38    stringif no crate name can be found.  */
  39 extern std::string rust_crate_for_block (const struct block *block);
  40
  41 /* Returns the last segment of a Rust path like foo::bar::baz.  Will
  42    not handle cases where the last segment contains generics.  */
  43
  44 extern const char *rust_last_path_segment (const char *path);
  45
  46 /* Create a new slice type.  NAME is the name of the type.  ELT_TYPE
  47    is the type of the elements of the slice.  USIZE_TYPE is the Rust
  48    "usize" type to use.  The new type is allocated whereever ELT_TYPE
  49    is allocated.  */
  50 extern struct type *rust_slice_type (const char *name, struct type *elt_type,
  51                                      struct type *usize_type);
  52
  53 /* Class representing the Rust language.  */
  54
  55 class rust_language : public language_defn
  56 {
  57 public:
  58   rust_language ()
  59     : language_defn (language_rust)
  60   { /* Nothing.  */ }
  61
  62   /* See language.h.  */
  63
  64   const char *name () const override
  65   { return "rust"; }
  66
  67   /* See language.h.  */
  68
  69   const char *natural_name () const override
  70   { return "Rust"; }
  71
  72   /* See language.h.  */
  73
  74   const std::vector<const char *> &filename_extensions () const override
  75   {
  76     static const std::vector<const char *> extensions = { ".rs" };
  77     return extensions;
  78   }
  79
  80   /* See language.h.  */
  81
  82   void language_arch_info (struct gdbarch *gdbarch,
  83                            struct language_arch_info *lai) const override;
  84
  85   /* See language.h.  */
  86
  87   bool sniff_from_mangled_name
  88        (const char *mangled, gdb::unique_xmalloc_ptr<char> *demangled)
  89        const override
  90   {
  91     *demangled = gdb_demangle (mangled, DMGL_PARAMS | DMGL_ANSI);
  92     return *demangled != NULL;
  93   }
  94
  95   /* See language.h.  */
  96
  97   gdb::unique_xmalloc_ptr<char> demangle_symbol (const char *mangled,
  98                                                  int options) const override
  99   {
 100     return gdb_demangle (mangled, options);
 101   }
 102
 103   /* See language.h.  */
 104
 105   void print_type (struct type *type, const char *varstring,
 106                    struct ui_file *stream, int show, int level,
 107                    const struct type_print_options *flags) const override;
 108
 109   /* See language.h.  */
 110
 111   gdb::unique_xmalloc_ptr<char> watch_location_expression
 112         (struct type *type, CORE_ADDR addr) const override
 113   {
 114     type = check_typedef (TYPE_TARGET_TYPE (check_typedef (type)));
 115     std::string name = type_to_string (type);
 116     return xstrprintf ("*(%s as *mut %s)", core_addr_to_string (addr),
 117                        name.c_str ());
 118   }
 119
 120   /* See language.h.  */
 121
 122   void value_print_inner
 123         (struct value *val, struct ui_file *stream, int recurse,
 124          const struct value_print_options *options) const override;
 125
 126   /* See language.h.  */
 127
 128   struct block_symbol lookup_symbol_nonlocal
 129         (const char *name, const struct block *block,
 130          const domain_enum domain) const override
 131   {
 132     struct block_symbol result = {};
 133
 134     if (symbol_lookup_debug)
 135       {
 136         gdb_printf (gdb_stdlog,
 137                     "rust_lookup_symbol_non_local"
 138                     " (%s, %s (scope %s), %s)\n",
 139                     name, host_address_to_string (block),
 140                     block_scope (block), domain_name (domain));
 141       }
 142
 143     /* Look up bare names in the block's scope.  */
 144     std::string scopedname;
 145     if (name[cp_find_first_component (name)] == '\0')
 146       {
 147         const char *scope = block_scope (block);
 148
 149         if (scope[0] != '\0')
 150           {
 151             scopedname = std::string (scope) + "::" + name;
 152             name = scopedname.c_str ();
 153           }
 154         else
 155           name = NULL;
 156       }
 157
 158     if (name != NULL)
 159       {
 160         result = lookup_symbol_in_static_block (name, block, domain);
 161         if (result.symbol == NULL)
 162           result = lookup_global_symbol (name, block, domain);
 163       }
 164     return result;
 165   }
 166
 167   /* See language.h.  */
 168
 169   int parser (struct parser_state *ps) const override;
 170
 171   /* See language.h.  */
 172
 173   void emitchar (int ch, struct type *chtype,
 174                  struct ui_file *stream, int quoter) const override;
 175
 176   /* See language.h.  */
 177
 178   void printchar (int ch, struct type *chtype,
 179                   struct ui_file *stream) const override
 180   {
 181     gdb_puts ("'", stream);
 182     emitchar (ch, chtype, stream, '\'');
 183     gdb_puts ("'", stream);
 184   }
 185
 186   /* See language.h.  */
 187
 188   void printstr (struct ui_file *stream, struct type *elttype,
 189                  const gdb_byte *string, unsigned int length,
 190                  const char *encoding, int force_ellipses,
 191                  const struct value_print_options *options) const override;
 192
 193   /* See language.h.  */
 194
 195   void print_typedef (struct type *type, struct symbol *new_symbol,
 196                       struct ui_file *stream) const override
 197   {
 198     type = check_typedef (type);
 199     gdb_printf (stream, "type %s = ", new_symbol->print_name ());
 200     type_print (type, "", stream, 0);
 201     gdb_printf (stream, ";");
 202   }
 203
 204   /* See language.h.  */
 205
 206   bool is_string_type_p (struct type *type) const override;
 207
 208   /* See language.h.  */
 209
 210   bool range_checking_on_by_default () const override
 211   { return true; }
 212
 213 private:
 214
 215   /* Helper for value_print_inner, arguments are as for that function.
 216      Prints structs and untagged unions.  */
 217
 218   void val_print_struct (struct value *val, struct ui_file *stream,
 219                          int recurse,
 220                          const struct value_print_options *options) const;
 221
 222   /* Helper for value_print_inner, arguments are as for that function.
 223      Prints discriminated unions (Rust enums).  */
 224
 225   void print_enum (struct value *val, struct ui_file *stream, int recurse,
 226                    const struct value_print_options *options) const;
 227 };
 228
 229 #endif /* RUST_LANG_H */