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/* Rust language support definitions for GDB, the GNU debugger.
Copyright (C) 2016-2021 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 gdb::unique_xmalloc_ptr<char>
(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)
{
fprintf_unfiltered (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
{
fputs_filtered ("'", stream);
emitchar (ch, chtype, stream, '\'');
fputs_filtered ("'", 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);
fprintf_filtered (stream, "type %s = ", new_symbol->print_name ());
type_print (type, "", stream, 0);
fprintf_filtered (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 */
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