gdb/rust-lang.h

   1 /* Rust language support definitions for GDB, the GNU debugger.
   2
   3    Copyright (C) 2016-2021 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 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 (const char *mangled,
  88                                 char **demangled) const override
  89   {
  90     *demangled = gdb_demangle (mangled, DMGL_PARAMS | DMGL_ANSI);
  91     return *demangled != NULL;
  92   }
  93
  94   /* See language.h.  */
  95
  96   char *demangle_symbol (const char *mangled, int options) const override
  97   {
  98     return gdb_demangle (mangled, options);
  99   }
 100
 101   /* See language.h.  */
 102
 103   void print_type (struct type *type, const char *varstring,
 104                    struct ui_file *stream, int show, int level,
 105                    const struct type_print_options *flags) const override;
 106
 107   /* See language.h.  */
 108
 109   gdb::unique_xmalloc_ptr<char> watch_location_expression
 110         (struct type *type, CORE_ADDR addr) const override
 111   {
 112     type = check_typedef (TYPE_TARGET_TYPE (check_typedef (type)));
 113     std::string name = type_to_string (type);
 114     return gdb::unique_xmalloc_ptr<char>
 115       (xstrprintf ("*(%s as *mut %s)", core_addr_to_string (addr),
 116                    name.c_str ()));
 117   }
 118
 119   /* See language.h.  */
 120
 121   void value_print_inner
 122         (struct value *val, struct ui_file *stream, int recurse,
 123          const struct value_print_options *options) const override;
 124
 125   /* See language.h.  */
 126
 127   struct block_symbol lookup_symbol_nonlocal
 128         (const char *name, const struct block *block,
 129          const domain_enum domain) const override
 130   {
 131     struct block_symbol result = {};
 132
 133     if (symbol_lookup_debug)
 134       {
 135         fprintf_unfiltered (gdb_stdlog,
 136                             "rust_lookup_symbol_non_local"
 137                             " (%s, %s (scope %s), %s)\n",
 138                             name, host_address_to_string (block),
 139                             block_scope (block), domain_name (domain));
 140       }
 141
 142     /* Look up bare names in the block's scope.  */
 143     std::string scopedname;
 144     if (name[cp_find_first_component (name)] == '\0')
 145       {
 146         const char *scope = block_scope (block);
 147
 148         if (scope[0] != '\0')
 149           {
 150             scopedname = std::string (scope) + "::" + name;
 151             name = scopedname.c_str ();
 152           }
 153         else
 154           name = NULL;
 155       }
 156
 157     if (name != NULL)
 158       {
 159         result = lookup_symbol_in_static_block (name, block, domain);
 160         if (result.symbol == NULL)
 161           result = lookup_global_symbol (name, block, domain);
 162       }
 163     return result;
 164   }
 165
 166   /* See language.h.  */
 167
 168   int parser (struct parser_state *ps) const override;
 169
 170   /* See language.h.  */
 171
 172   void emitchar (int ch, struct type *chtype,
 173                  struct ui_file *stream, int quoter) const override;
 174
 175   /* See language.h.  */
 176
 177   void printchar (int ch, struct type *chtype,
 178                   struct ui_file *stream) const override
 179   {
 180     fputs_filtered ("'", stream);
 181     emitchar (ch, chtype, stream, '\'');
 182     fputs_filtered ("'", stream);
 183   }
 184
 185   /* See language.h.  */
 186
 187   void printstr (struct ui_file *stream, struct type *elttype,
 188                  const gdb_byte *string, unsigned int length,
 189                  const char *encoding, int force_ellipses,
 190                  const struct value_print_options *options) const override;
 191
 192   /* See language.h.  */
 193
 194   void print_typedef (struct type *type, struct symbol *new_symbol,
 195                       struct ui_file *stream) const override
 196   {
 197     type = check_typedef (type);
 198     fprintf_filtered (stream, "type %s = ", new_symbol->print_name ());
 199     type_print (type, "", stream, 0);
 200     fprintf_filtered (stream, ";");
 201   }
 202
 203   /* See language.h.  */
 204
 205   bool is_string_type_p (struct type *type) const override;
 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 */