Make sure we don't fallback to printing the initial value of a
non-const variable in the executable.
Also make sure we can do 'disassemble', as another test that GDB is
able to read read-only parts from the executable (the existing test of
printing constglob also covers that case).
gdb/testsuite/
2013-03-20 Pedro Alves <palves@redhat.com>
Yao Qi <yao@codesourcery.com>
* gdb.trace/tfile.c: Add comments.
(nonconstglob): New global.
* gdb.trace/tfile.exp: Add comments. Test printing a non-const
global that is not covered by the trace frame. Test
disassembling.
gdb/python/python-internal.h (HAVE_SNPRINTF)
[_WIN32 && HAVE_DECL_SNPRINTF]: Define, to avoid compiler warnings
about redefinition of snprintf by pyerrors.h.
* dwarf2read.c (dw2_map_symtabs_matching_filename): Put continue after
any successful compare_filenames_for_search or FILENAME_CMP.
* psymtab.c (partial_map_symtabs_matching_filename): Likewise.
* symtab.c (iterate_over_some_symtabs): Likewise.
Subject: [PATCH] Fix for PR c++/15203 and PR c++/15210
Date: Sat, 09 Mar 2013 02:50:49 -0300 (5 days, 4 hours, 57 minutes ago)
Message-ID: <m3a9qdnmti.fsf@redhat.com>
Hi,
This bug was reported internally at our Bugzilla, along with a proposed
fix. After talking to Keith about it, he investigated and came up with
another patch needed to really fix the issue on CVS HEAD.
The first part of the fix is the patch to cp-namespace.c. It handles
the case when we are accessing a static variable inside a function
(inside a class) by the full linespec (is it right, Keith?). E.g.:
class foo
{
public:
int bar()
{
static int var = 0;
}
};
And then, printing the value of `var':
(gdb) print 'foo::bar()::var'
GDB would fall in an internal_error:
gdb/cp-namespace.c:816: internal-error: cp_lookup_nested_symbol called on a non-aggregate type.
This is because `cp_lookup_nested_symbol' is not handling the case when
TYPE_CODE is either _FUNC or _METHOD. This patch fixes it by returning
NULL in this case.
The second part of the fix is the patch to elfread.c. It is needed
because the BSF_GNU_UNIQUE flag was added to some symbols in
<http://sourceware.org/ml/binutils/2009-06/msg00016.html>. Because of
that, (still) the command:
(gdb) print 'foo::bar()::var'
where `var' is a static variable returns:
"No symbol "foo::bar()::var" in current context."
So with the second patch applied the command finally DTRT:
(gdb) print 'foo::bar()::var'
$1 = 0
This may not be the ideal solution, according to Keith it would be good
to implement productions on c-exp.y in order to recognize
CLASS::FUNCTION::VARIABLE, but it is a solution which works with what we
have today.
I regtested it in Fedora 17 x86_64 with -m64 and -m32, including
gdbserver, without regressions.
gdb/:
2013-03-14 Keith Seitz <keiths@redhat.com>
Alan Matsuoka <alanm@redhat.com>
PR c++/15203
PR c++/15210
* cp-namespace.c (cp_lookup_nested_symbol): Handle TYPE_CODE_FUNC and
TYPE_CODE_METHOD.
* elfread.c (elf_symtab_read): Handle BSF_GNU_UNIQUE for certain
symbols.
gdb/testsuite/:
2013-03-14 Sergio Durigan Junior <sergiodj@redhat.com>
PR c++/15203
PR c++/15210
* gdb.cp/m-static.cc (keepalive_int): New function.
(gnu_obj_1::method): New variable `sintvar', call `keepalive_int'.
* gdb.cp/m-static.exp: New test for `sintvar'.
* gdb.trace/tstatus.exp (run_trace_experiment): Save the output
of 'tstatus' into tstatus_output.
(top level): Save the trace data to tfile. Read trace file in
tfile target. Check the trace status.
As mentioned in the previous patch, I grepped for "\*\*) &" and found
one hit in completer.c.
I was about to post a patch that simply made
current_demangling_style_string const, and cast away constness at the
xfree site. However, looking deeper, it seem to be there's a lot of
dead code in the file.
First, all external callers of set_demangling_style are found in the
stabs reader, commented out for over 12 years:
http://sourceware.org/ml/gdb-patches/2000-12/msg00214.html
I don't think it's likely we'll ever make the older mangling schemes
work for stabs. If we do, we can rediscuss the approach then.
Then, set_demangling_command has special handling for unknown
demangling styles, but "set demangle-style" is an enum command, and
with those, the user can only specify a known enumeration value, by
design:
(gdb) set demangle-style gangnam-style
Undefined item: "gangnam-style".
This patch removes all that dead code, then makes
current_demangling_style_string point to an element of
demangling_style_names, as the FIXME suggests, and then makes
current_demangling_style_string, removing the need for the 'const char
**' cast.
gdb/
2013-03-13 Pedro Alves <palves@redhat.com>
* dbxread.c (read_ofile_symtab, process_one_symbol): Remove
commented out code.
* demangle.c (current_demangling_style_string): Make it const.
(set_demangling_command): Assert the demangling style is known.
Remove all handling of unknown styles. Set
'current_demangling_style_string' to an element of the
demangling_style_names array.
(set_demangling_style): Delete.
(_initialize_demangler): Set current_demangling_style_string to the
element of the demangling_style_names array that corresponds to
the default demangling style. Remove FIXME note. Don't call
set_demangling_style.
* gdb-demangle.h (set_demangling_style): Remove declaration.
This fixes the followin error when HAVE_LINUX_BTRACE is not defined:
linux-low.c:5943: error: excess elements in struct initializer
linux-low.c:5943: error: (near initialization for 'linux_target_ops')
gdb/gdbserver/ChangeLog:
* linux-low.c (linux_target_ops) [!HAVE_LINUX_BTRACE]:
Remove extraneous NULL element.
This is sort of a continuation of Keith's parse_exp_1 constification
patch. It started out by undoing these bits:
@@ -754,9 +754,12 @@ validate_actionline (char **line, struct
tmp_p = p;
for (loc = t->base.loc; loc; loc = loc->next)
{
- p = tmp_p;
- exp = parse_exp_1 (&p, loc->address,
+ const char *q;
+
+ q = tmp_p;
+ exp = parse_exp_1 (&q, loc->address,
block_for_pc (loc->address), 1);
+ p = (char *) q;
and progressively making more things const upwards, fixing fallout,
rinse repeat, until GDB built again (--enable-targets=all).
That ended up constifying lookup_cmd/add_cmd and (lots of) friends,
and the completers.
I didn't try to constify the command hooks themselves, because I know
upfront there are commands that write to the command string argument,
and I think I managed to stop at a nice non-hacky split point already.
I think the only non-really-super-obvious changes are
tracepoint.c:validate_actionline, and tracepoint.c:trace_dump_actions.
The rest is just mostly about 'char *' => 'const char *', 'char **'=>
'const char **', and the occasional (e.g., deprecated_cmd_warning)
case of 'char **'=> 'const char *', where/when I noticed that nothing
actually cares about the pointer to pointer output.
Tested on x86_64 Fedora 17, native and gdbserver.
gdb/
2013-03-13 Pedro Alves <palves@redhat.com>
* ada-lang.c (struct add_partial_datum) <text, text0, word>: Make
fields const.
(ada_make_symbol_completion_list): Make "text0" parameter const.
* ax-gdb.c (agent_eval_command_one): Make "exp" parameter const.
* breakpoint.c (condition_completer): Make "text" and "word"
parameters const. Adjust.
(check_tracepoint_command): Adjust to validate_actionline
prototype change.
(catch_syscall_completer): Make "text" and "word" parameters
const.
* cli/cli-cmds.c (show_user): Make "comname" local const.
(valid_command_p): Make "command" parameter const.
(alias_command): Make "alias_prefix" and "command_prefix" locals
const.
* cli/cli-decode.c (add_cmd): Make "name" parameter const.
(add_alias_cmd): Make "name" and "oldname" parameters const.
Adjust. No longer make copy of OLDNAME.
(add_prefix_cmd, add_abbrev_prefix_cmd, add_set_or_show_cmd)
(add_setshow_cmd_full, add_setshow_enum_cmd)
(add_setshow_auto_boolean_cmd, add_setshow_boolean_cmd)
(add_setshow_filename_cmd, add_setshow_string_cmd)
(add_setshow_string_noescape_cmd)
(add_setshow_optional_filename_cmd, add_setshow_integer_cmd)
(add_setshow_uinteger_cmd, add_setshow_zinteger_cmd)
(add_setshow_zuinteger_unlimited_cmd, add_setshow_zuinteger_cmd)
(delete_cmd, add_info, add_info_alias, add_com, add_com_alias):
Make "name" parameter const.
(help_cmd): Rename "command" parameter to "arg". New const local
"command".
(find_cmd): Make "command" parameter const.
(lookup_cmd_1): Make "text" parameter pointer to const. Adjust to
deprecated_cmd_warning prototype change.
(undef_cmd_error): Make "cmdtype" parameter const.
(lookup_cmd): Make "line" parameter const.
(deprecated_cmd_warning): Change type of "text" parameter to
pointer to const char, from pointer to pointer to char. Adjust.
(lookup_cmd_composition): Make "text" parameter const.
(complete_on_cmdlist, complete_on_enum): Make "text" and "word"
parameters const.
* cli/cli-decode.h (struct cmd_list_element) <name>: Make field
const.
* cli/cli-script.c (validate_comname): Make "tem" local const.
(define_command): New const local "tem_c". Use it in calls to
lookup_cmd.
(document_command): Make "tem" and "comfull" locals const.
(show_user_1): Make "prefix" and "name" parameters const.
* cli-script.h (show_user_1): Make "prefix" and "name" parameters
const.
* command.h (add_cmd, add_alias_cmd, add_prefix_cmd)
(add_abbrev_prefix_cmd, completer_ftype, lookup_cmd, lookup_cmd_1)
(deprecated_cmd_warning, lookup_cmd_composition, add_com)
(add_com_alias, add_info, add_info_alias, complete_on_cmdlist)
(complete_on_enum, add_setshow_enum_cmd)
(add_setshow_auto_boolean_cmd, add_setshow_boolean_cmd)
(add_setshow_filename_cmd, add_setshow_string_cmd)
(add_setshow_string_noescape_cmd)
(add_setshow_optional_filename_cmd, add_setshow_integer_cmd)
(add_setshow_uinteger_cmd, add_setshow_zinteger_cmd)
(add_setshow_zuinteger_cmd, add_setshow_zuinteger_unlimited_cmd):
Change prototypes, constifying strings.
* completer.c (noop_completer, filename_completer): Make "text"
and "prefix" parameters const.
(location_completer, expression_completer)
(complete_line_internal): Make "text" and "prefix" parameters
const and adjust.
(command_completer, signal_completer): Make "text" and "prefix"
parameters const.
* completer.h (noop_completer, filename_completer)
(expression_completer, location_completer, command_completer)
(signal_completer): Change prototypes.
* corefile.c (complete_set_gnutarget): Make "text" and "word"
parameters const.
* cp-abi.c (cp_abi_completer): Likewise.
* expression.h (parse_expression_for_completion): Change
prototype.
* f-lang.c (f_make_symbol_completion_list): Make "text" and "word"
parameters const.
* infcmd.c (_initialize_infcmd): Make "cmd_name" local const.
* infrun.c (handle_completer): Make "text" and "word" parameters
const.
* interps.c (interpreter_completer): Make "text" and "word"
parameters const.
* language.h (struct language_defn)
<la_make_symbol_completion_list>: Make "text" and "word"
parameters const.
* parse.c (parse_exp_1): Move const hack to parse_exp_in_context.
(parse_exp_in_context): Rename to ...
(parse_exp_in_context_1): ... this.
(parse_exp_in_context): Reimplement, with const hack from
parse_exp_1.
(parse_expression_for_completion): Make "string" parameter const.
* printcmd.c (decode_format): Make "string_ptr" parameter pointer
to pointer to const char. Adjust.
(print_command_1): Make "exp" parameter const.
(output_command): Rename to ...
(output_command_const): ... this. Make "exp" parameter const.
(output_command): Reimplement.
(x_command): Adjust.
(display_command): Rename "exp" parameter to "arg". New "exp"
local, const version of "arg".
* python/py-auto-load.c (gdbpy_initialize_auto_load): Make
"cmd_name" local const.
* python/py-cmd.c (cmdpy_destroyer): Cast const away in xfree
call.
(cmdpy_completer): Make "text" and "word" parameters const.
(gdbpy_parse_command_name): Make "prefix_text2" local const.
* python/py-param.c (add_setshow_generic): Make "tmp_name" local
const.
* remote.c (_initialize_remote): Make "cmd_name" local const.
* symtab.c (language_search_unquoted_string): Make "text" and "p"
parameters const. Adjust.
(completion_list_add_fields): Make "sym_text", "text" and "word"
parameters const.
(struct add_name_data) <sym_text, text, word>: Make fields const.
(default_make_symbol_completion_list_break_on): Make "text" and
"word" parameters const. Adjust locals.
(default_make_symbol_completion_list)
(make_symbol_completion_list, make_symbol_completion_type)
(make_symbol_completion_list_fn): Make "text" and "word"
parameters const.
(make_file_symbol_completion_list): Make "text", "word" and
"srcfile" parameters const. Adjust locals.
(add_filename_to_list): Make "text" and "word" parameters const.
(struct add_partial_filename_data) <text, word>: Make fields
const.
(make_source_files_completion_list): Make "text" and "word"
parameters const.
* symtab.h (default_make_symbol_completion_list_break_on)
(default_make_symbol_completion_list, make_symbol_completion_list)
(make_symbol_completion_type enum type_code)
(make_symbol_completion_list_fn make_file_symbol_completion_list)
(make_source_files_completion_list): Change prototype.
* top.c (execute_command): Adjust to pass pointer to pointer to
const char to lookup_cmd, and to deprecated_cmd_warning prototype
change.
(set_verbose): Make "cmdname" local const.
* tracepoint.c (decode_agent_options): Make "exp" parameter const,
and adjust.
(validate_actionline): Make "line" parameter a pointer to const
char, and adjust.
(encode_actions_1): Make "action_exp" local const, and adjust.
(encode_actions): Adjust.
(replace_comma): Delete.
(trace_dump_actions): Make "action_exp" and "next_comma" locals
const, and adjust. Don't frob the action string while splitting
it at commas. Instead, make a copy of each split substring in
turn.
(trace_dump_command): Adjust to validate_actionline prototype
change.
* tracepoint.h (decode_agent_options, decode_agent_options)
(encode_actions, validate_actionline): Change prototypes.
* valprint.h (output_command): Delete declaration.
(output_command_const): Declare.
* value.c (function_destroyer): Cast const away in xfree call.
As a follow up to:
http://sourceware.org/ml/gdb-patches/2013-03/msg00449.html
In a nutshell, casts between 'char **' <-> 'unsigned char **' and
'char **' <-> 'const char **' are invalid.
I grepped for "\*\*) &" and found these. There's another one in
demangle.c, but I've split fixing that one to a separate patch.
I think the ada_decode_symbol change is perhaps the one that could be
surprising. The function's description has this comment, which makes
things much clearer:
The GSYMBOL parameter is "mutable" in the C++ sense: logically
const, but nevertheless modified to a semantically equivalent form
when a decoded name is cached in it. */
const char *
ada_decode_symbol (const struct general_symbol_info *gsymbol)
With that out of the way, I think the patch ends up being pretty
obvious.
Tested on x86_64 Fedora 17.
gdb/
2013-03-13 Pedro Alves <palves@redhat.com>
* ada-lang.c (ada_decode_symbol): Cast away constness of GSYMBOL
rather than casting 'const char * const *' to 'const char **'.
* ada-lex.l (processInt): Make "trailer" local const. Remove
'const char **' cast.
* arm-linux-tdep.c (arm_stap_parse_special_token): Add 'char *'
locals, and use those as strtol output pointer, instead than doing
invalid casts to from 'const char **' to 'char **'.
(_initialize_demangle): Remove cast.
* i386-tdep.c (i386_stap_parse_special_token): : Add 'char *'
locals, and use those as strtol output pointer, instead than doing
invalid casts to from 'const char **' to 'char **'.
* solib-dsbt.c (dsbt_get_initial_loadmaps): Remove 'gdb_byte**'
casts.
* stap-probe.c (stap_parse_register_operand)
(stap_parse_single_operand): Likewise.
the last matched 'V' blcok in trace frame.
gdb/gdbserver:
* tracepoint.c (traceframe_read_tsv): Look for the last matched
'V' block in trace frame.
gdb/testsuite:
* gdb.trace/tsv.exp (check_tsv): New.
(top level): Save a tfile on current trace session. Call
check_tsv on live target. Load the tfile with target tfile
and call check_tsv again.
* mi/mi-interp.c (mi_interpreter_exec): Make "command" const.
Remove temporary copy of input string.
(mi_execute_command_wrapper): Make "cmd" const.
* mi/mi-main.c (mi_execute_command): Make "string_ptr" const.
* mi/mi-parse.c (mi_parse_argv): Make "args" const.
Use const strings.
(mi_parse): Make "cmd" const.
Use const strings.
* mi/mi-parse.h (mi_parse): Make "cmd" const.
pointer to expression string to parse_exp_1.
(create_excep_cond_exprs): Likewise.
* ax-gdb.c (agent_eval_command_one): Likewise.
(maint_agent_printf_command): Likewise.
Constify much of the string handling/parsing.
* breakpoint.c (set_breakpoint_condition): Pass const
pointer to expression string to parse_exp_1.
(update_watchpoint): Likewise.
(parse_cmd_to_aexpr): Constify string handling.
Pass const pointer to parse_exp_1.
(init_breakpoint_sal): Pass const pointer to parse_exp_1.
(find_condition_and_thread): Likewise.
Make TOK const.
(watch_command_1): Make "arg" const.
Constify string handling.
Copy the expression string instead of changing the input
string.
(update_breakpoint_location): Pass const pointer to
parse_exp_1.
* eval.c (parse_and_eval_address): Make "exp" const.
(parse_to_comma_and_eval): Make "expp" const.
(parse_and_eval): Make "exp" const.
* expression.h (parse_expression): Make argument const.
(parse_exp_1): Make first argument const.
* findcmd.c (parse_find_args): Treat "args" as const.
* linespec.c (parse_linespec): Pass const pointer to
linespec_expression_to_pc.
(linespec_expression_to_pc): Make "exp_ptr" const.
* parse.c (parse_exp_1): Make "stringptr" const.
Make a copy of the expression to pass to parse_exp_in_context until
this whole interface can be constified.
(parse_expression): Make "string" const.
* printcmd.c (ui_printf): Treat "arg" as const.
Handle const strings.
* tracepoint.c (validate_actionline): Pass const pointer to
all calls to parse_exp_1.
(encode_actions_1): Likewise.
* value.h (parse_to_comma_and_eval): Make argument const.
(parse_and_eval_address): Likewise.
(parse_and_eval): Likewise.
* varobj.c (varobj_create): Pass const pointer to parse_exp_1.
(varobj_set_value): Likewise.
* cli/cli-cmds.c (disassemble_command): Treat "arg" as const and
constify string handling.
Pass const pointers to parse_and_eval_address and
parse_to_comman_and_eval.
* cli/cli-utils.c (skip_to_space): Rename to ...
(skip_to_space_const): ... this. Handle const strings.
* cli/cli-utils.h (skip_to_space): Turn into macro which invokes
skip_to_space_const.
(skip_to_space_const): Declare.
* common/format.c (parse_format_string): Make "arg" const.
Handle const strings.
* common/format.h (parse_format_string): Make "arg" const.
* gdbserver/ax.c (ax_printf): Make "format" const.
* python/python.c (gdbpy_parse_and_eval): Do not make a copy
of the expression string.
Hui Zhu <hui@codesourcery.com>
* dwarf2loc.c (access_memory): Change nbits to nbytes in gdb_assert.
(dwarf2_compile_expr_to_ax): Call access_memory in DW_OP_deref and
DW_OP_deref_size.
GDB treats the identifiers 'if', 'thread', and 'task' unconditionally
as expression delimiters in Ada mode, which is correct for 'if' and 'task',
but wrong for 'thread' in cases such as
print thread
Borrowing from c-exp.y, we observe that 'thread' must be followed by
numerals, whereas identifiers never are and treat them as delimiters
only in that case.
In the process, the current also refactors and incidentally fixes the
code for rewinding the input to before the delimiting tokens. For
example, the code
watch expr if i > 2
fails because the input is only rewound to just before the 'i',
leaving the 'if' as part of the expression (and thus making the
rest look like trailing junk rather than a conditional clause).
gdb/ChangeLog:
* ada-lex.l (rules): Only recognize 'thread' as a
delimiter when followed by numerals, as for c-exp.y.
Use new rewind_to_char function to rewind the input for
expression-delimiting tokens.
(rewind_to_char): New function.
gdb/testsuite/ChangeLog:
* gdb.ada/expr_delims.exp: New file.
* gdb.ada/expr_delims/foo.adb: New file.
* gdb.ada/expr_delims/pck.ads: New file.
* gdb.ada/expr_delims/pck.adb: New file.
Pedro Alves
Corinna Vinschen
Yao Qi
gdbadmin
Jan Kratochvil
Eli Zaretskii
Steve Ellcey
Tom Tromey
Sergio Durigan Junior
Joel Brobecker
Keith Seitz
Hui Zhu
Paul N. Hilfinger