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43cc5389bc
PR rust/21484 notes that watch -location does not work with Rust:
(gdb) watch -location a
syntax error in expression, near `) 0x00007fffffffe0f4'.
update_watchpoint tries to tell gdb that the new expression it creates
has C syntax:
/* The above expression is in C. */
b->language = language_c;
However, update_watchpoint doesn't actually use this language when
re-parsing the expression.
Originally I was going to fix this by saving and restoring the
language in update_watchpoint, but this regressed
gdb.dlang/watch-loc.exp, because the constructed expression actually
has D syntax (specifically the name is not parseable by C).
Next I looked at directly constructing an expression, and not relying
on the parser at all; but it seemed to me that upon a re-set, we'd
want to reparse the type, and there is no existing API to do this
correctly.
So, in the end I made a hook to let each language choose what
expression to use. I made all the languages other than Rust use the C
expression, because that is the status quo ante. However, this is
probably not truly correct. After this patch, at least, it is easy to
correct by someone who knows the language(s) in question.
Regtested by the buildbot.
ChangeLog
2017-05-19 Tom Tromey <tom@tromey.com>
PR rust/21484:
* rust-lang.c (exp_descriptor_rust): New function.
(rust_language_defn): Use it.
* p-lang.c (pascal_language_defn): Update.
* opencl-lang.c (opencl_language_defn): Update.
* objc-lang.c (objc_language_defn): Update.
* m2-lang.c (m2_language_defn): Update.
* language.h (struct language_defn)
<la_watch_location_expression>: New member.
* language.c (unknown_language_defn, auto_language_defn)
(local_language_defn): Update.
* go-lang.c (go_language_defn): Update.
* f-lang.c (f_language_defn): Update.
* d-lang.c (d_language_defn): Update.
* c-lang.h (c_watch_location_expression): Declare.
* c-lang.c (c_watch_location_expression): New function.
(c_language_defn, cplus_language_defn, asm_language_defn)
(minimal_language_defn): Use it.
* breakpoint.c (watch_command_1): Call
la_watch_location_expression.
* ada-lang.c (ada_language_defn): Update.
testsuite/ChangeLog
2017-05-19 Tom Tromey <tom@tromey.com>
PR rust/21484:
* gdb.rust/watch.exp: New file.
* gdb.rust/watch.rs: New file.
171 lines
5.0 KiB
C++
171 lines
5.0 KiB
C++
/* C language support definitions for GDB, the GNU debugger.
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Copyright (C) 1992-2017 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#if !defined (C_LANG_H)
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#define C_LANG_H 1
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struct ui_file;
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struct language_arch_info;
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struct type_print_options;
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struct parser_state;
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#include "value.h"
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#include "macroexp.h"
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#include "parser-defs.h"
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#include "common/enum-flags.h"
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/* The various kinds of C string and character. Note that these
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values are chosen so that they may be or'd together in certain
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ways. */
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enum c_string_type_values
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{
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/* An ordinary string: "value". */
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C_STRING = 0,
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/* A wide string: L"value". */
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C_WIDE_STRING = 1,
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/* A 16-bit Unicode string: u"value". */
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C_STRING_16 = 2,
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/* A 32-bit Unicode string: U"value". */
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C_STRING_32 = 3,
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/* An ordinary char: 'v'. This can also be or'd with one of the
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above to form the corresponding CHAR value from a STRING
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value. */
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C_CHAR = 4,
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/* A wide char: L'v'. */
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C_WIDE_CHAR = 5,
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/* A 16-bit Unicode char: u'v'. */
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C_CHAR_16 = 6,
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/* A 32-bit Unicode char: U'v'. */
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C_CHAR_32 = 7
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};
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DEF_ENUM_FLAGS_TYPE (enum c_string_type_values, c_string_type);
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/* Defined in c-exp.y. */
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extern int c_parse (struct parser_state *);
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extern void c_yyerror (const char *);
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extern int c_parse_escape (const char **, struct obstack *);
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/* Defined in c-typeprint.c */
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extern void c_print_type (struct type *, const char *,
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struct ui_file *, int, int,
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const struct type_print_options *);
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extern void c_print_typedef (struct type *,
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struct symbol *,
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struct ui_file *);
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extern void c_val_print (struct type *,
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int, CORE_ADDR,
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struct ui_file *, int,
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struct value *,
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const struct value_print_options *);
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extern void c_value_print (struct value *, struct ui_file *,
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const struct value_print_options *);
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/* These are in c-lang.c: */
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extern struct value *evaluate_subexp_c (struct type *expect_type,
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struct expression *exp,
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int *pos,
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enum noside noside);
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extern void c_printchar (int, struct type *, struct ui_file *);
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extern void c_printstr (struct ui_file * stream,
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struct type *elttype,
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const gdb_byte *string,
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unsigned int length,
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const char *user_encoding,
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int force_ellipses,
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const struct value_print_options *options);
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extern void c_language_arch_info (struct gdbarch *gdbarch,
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struct language_arch_info *lai);
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extern const struct exp_descriptor exp_descriptor_c;
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extern void c_emit_char (int c, struct type *type,
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struct ui_file *stream, int quoter);
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extern const struct op_print c_op_print_tab[];
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extern gdb::unique_xmalloc_ptr<char> c_watch_location_expression
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(struct type *type, CORE_ADDR addr);
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/* These are in c-typeprint.c: */
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extern void c_type_print_base (struct type *, struct ui_file *,
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int, int, const struct type_print_options *);
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/* These are in cp-valprint.c */
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extern void cp_print_class_member (const gdb_byte *, struct type *,
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struct ui_file *, const char *);
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extern void cp_print_value_fields (struct type *, struct type *,
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LONGEST, CORE_ADDR,
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struct ui_file *, int,
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struct value *,
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const struct value_print_options *,
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struct type **, int);
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extern void cp_print_value_fields_rtti (struct type *,
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const gdb_byte *, LONGEST, CORE_ADDR,
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struct ui_file *, int,
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struct value *,
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const struct value_print_options *,
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struct type **, int);
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extern int cp_is_vtbl_ptr_type (struct type *);
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extern int cp_is_vtbl_member (struct type *);
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/* These are in c-valprint.c. */
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extern int c_textual_element_type (struct type *, char);
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/* Create a new instance of the C compiler and return it. The new
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compiler is owned by the caller and must be freed using the destroy
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method. This function never returns NULL, but rather throws an
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exception on failure. This is suitable for use as the
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la_get_compile_instance language method. */
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extern struct compile_instance *c_get_compile_context (void);
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/* This takes the user-supplied text and returns a new bit of code to
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compile.
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This is used as the la_compute_program language method; see that
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for a description of the arguments. */
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extern std::string c_compute_program (struct compile_instance *inst,
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const char *input,
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struct gdbarch *gdbarch,
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const struct block *expr_block,
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CORE_ADDR expr_pc);
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#endif /* !defined (C_LANG_H) */
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