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| author | Tom Tromey <tom@tromey.com> | 2017-05-14 11:12:14 -0600 |
|---|---|---|
| committer | Tom Tromey <tom@tromey.com> | 2017-05-19 21:23:16 -0600 |
| commit | 43cc5389bc4662b31cad02a9f13358bd367d0ab3 (patch) | |
| tree | 4b2f2c7522c88aeb6235cb82fe642d4e0079d265 /gdb/c-lang.h | |
| parent | a9dba87af1aeabffb01769004ab893173f3ef472 (diff) | |
| download | gdb-43cc5389bc4662b31cad02a9f13358bd367d0ab3.zip gdb-43cc5389bc4662b31cad02a9f13358bd367d0ab3.tar.gz gdb-43cc5389bc4662b31cad02a9f13358bd367d0ab3.tar.bz2 | |
Use watchpoint's language when re-parsing expression
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.
Diffstat (limited to 'gdb/c-lang.h')
| -rw-r--r-- | gdb/c-lang.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/gdb/c-lang.h b/gdb/c-lang.h index 9746238..5ce6486 100644 --- a/gdb/c-lang.h +++ b/gdb/c-lang.h @@ -112,6 +112,9 @@ extern void c_emit_char (int c, struct type *type, extern const struct op_print c_op_print_tab[]; +extern gdb::unique_xmalloc_ptr<char> c_watch_location_expression + (struct type *type, CORE_ADDR addr); + /* These are in c-typeprint.c: */ extern void c_type_print_base (struct type *, struct ui_file *, |