aboutsummaryrefslogtreecommitdiff
path: root/gdb/rust-lang.h
blob: 0e89b8822cb345b56565919f560cdcfd85dfb83c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
/* Rust language support definitions for GDB, the GNU debugger.

   Copyright (C) 2016-2022 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef RUST_LANG_H
#define RUST_LANG_H

#include "demangle.h"
#include "language.h"
#include "value.h"
#include "c-lang.h"

struct parser_state;
struct type;

/* Return true if TYPE is a tuple type; otherwise false.  */
extern bool rust_tuple_type_p (struct type *type);

/* Return true if TYPE is a tuple struct type; otherwise false.  */
extern bool rust_tuple_struct_type_p (struct type *type);

/* Given a block, find the name of the block's crate. Returns an empty
   stringif no crate name can be found.  */
extern std::string rust_crate_for_block (const struct block *block);

/* Returns the last segment of a Rust path like foo::bar::baz.  Will
   not handle cases where the last segment contains generics.  */

extern const char *rust_last_path_segment (const char *path);

/* Create a new slice type.  NAME is the name of the type.  ELT_TYPE
   is the type of the elements of the slice.  USIZE_TYPE is the Rust
   "usize" type to use.  The new type is allocated whereever ELT_TYPE
   is allocated.  */
extern struct type *rust_slice_type (const char *name, struct type *elt_type,
				     struct type *usize_type);

/* Class representing the Rust language.  */

class rust_language : public language_defn
{
public:
  rust_language ()
    : language_defn (language_rust)
  { /* Nothing.  */ }

  /* See language.h.  */

  const char *name () const override
  { return "rust"; }

  /* See language.h.  */

  const char *natural_name () const override
  { return "Rust"; }

  /* See language.h.  */

  const std::vector<const char *> &filename_extensions () const override
  {
    static const std::vector<const char *> extensions = { ".rs" };
    return extensions;
  }

  /* See language.h.  */

  void language_arch_info (struct gdbarch *gdbarch,
			   struct language_arch_info *lai) const override;

  /* See language.h.  */

  bool sniff_from_mangled_name
       (const char *mangled, gdb::unique_xmalloc_ptr<char> *demangled)
       const override
  {
    *demangled = gdb_demangle (mangled, DMGL_PARAMS | DMGL_ANSI);
    return *demangled != NULL;
  }

  /* See language.h.  */

  gdb::unique_xmalloc_ptr<char> demangle_symbol (const char *mangled,
						 int options) const override
  {
    return gdb_demangle (mangled, options);
  }

  /* See language.h.  */

  void print_type (struct type *type, const char *varstring,
		   struct ui_file *stream, int show, int level,
		   const struct type_print_options *flags) const override;

  /* See language.h.  */

  gdb::unique_xmalloc_ptr<char> watch_location_expression
	(struct type *type, CORE_ADDR addr) const override
  {
    type = check_typedef (TYPE_TARGET_TYPE (check_typedef (type)));
    std::string name = type_to_string (type);
    return xstrprintf ("*(%s as *mut %s)", core_addr_to_string (addr),
		       name.c_str ());
  }

  /* See language.h.  */

  void value_print_inner
	(struct value *val, struct ui_file *stream, int recurse,
	 const struct value_print_options *options) const override;

  /* See language.h.  */

  struct block_symbol lookup_symbol_nonlocal
	(const char *name, const struct block *block,
	 const domain_enum domain) const override
  {
    struct block_symbol result = {};

    if (symbol_lookup_debug)
      {
	gdb_printf (gdb_stdlog,
		    "rust_lookup_symbol_non_local"
		    " (%s, %s (scope %s), %s)\n",
		    name, host_address_to_string (block),
		    block_scope (block), domain_name (domain));
      }

    /* Look up bare names in the block's scope.  */
    std::string scopedname;
    if (name[cp_find_first_component (name)] == '\0')
      {
	const char *scope = block_scope (block);

	if (scope[0] != '\0')
	  {
	    scopedname = std::string (scope) + "::" + name;
	    name = scopedname.c_str ();
	  }
	else
	  name = NULL;
      }

    if (name != NULL)
      {
	result = lookup_symbol_in_static_block (name, block, domain);
	if (result.symbol == NULL)
	  result = lookup_global_symbol (name, block, domain);
      }
    return result;
  }

  /* See language.h.  */

  int parser (struct parser_state *ps) const override;

  /* See language.h.  */

  void emitchar (int ch, struct type *chtype,
		 struct ui_file *stream, int quoter) const override;

  /* See language.h.  */

  void printchar (int ch, struct type *chtype,
		  struct ui_file *stream) const override
  {
    gdb_puts ("'", stream);
    emitchar (ch, chtype, stream, '\'');
    gdb_puts ("'", stream);
  }

  /* See language.h.  */

  void printstr (struct ui_file *stream, struct type *elttype,
		 const gdb_byte *string, unsigned int length,
		 const char *encoding, int force_ellipses,
		 const struct value_print_options *options) const override;

  /* See language.h.  */

  void print_typedef (struct type *type, struct symbol *new_symbol,
		      struct ui_file *stream) const override
  {
    type = check_typedef (type);
    gdb_printf (stream, "type %s = ", new_symbol->print_name ());
    type_print (type, "", stream, 0);
    gdb_printf (stream, ";");
  }

  /* See language.h.  */

  bool is_string_type_p (struct type *type) const override;

  /* See language.h.  */

  bool range_checking_on_by_default () const override
  { return true; }

private:

  /* Helper for value_print_inner, arguments are as for that function.
     Prints structs and untagged unions.  */

  void val_print_struct (struct value *val, struct ui_file *stream,
			 int recurse,
			 const struct value_print_options *options) const;

  /* Helper for value_print_inner, arguments are as for that function.
     Prints discriminated unions (Rust enums).  */

  void print_enum (struct value *val, struct ui_file *stream, int recurse,
		   const struct value_print_options *options) const;
};

#endif /* RUST_LANG_H */