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'struct expression *' -> gdb::unique_xmalloc_ptr<expression>

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This patch makes parse_expression and friends return a unique_ptr
instead of raw pointer [1]:

  typedef gdb::unique_malloc_ptr<expression> expression_up;

and then adjusts the codebase throughout to stop using cleanups to
manage lifetime of expression pointers.

Whenever I found a structure owning an expression pointer, I made it
store a unique_ptr instead of a raw pointer, which then requires using
new/delete of the holding structure, instead of XNEW/xfree.

[1] - I'd like to set the rule that types named with an "_up" suffix
      are unique_ptr typedefs.

Note I used gdb::unique_xmalloc_ptr instead of gdb::unique_ptr, simply
because we still use xmalloc instead of new to allocate expression
objects.  Once that's changed, all we need to do is change the
expression_up typedef and the smart pointer will then call delete
instead of xfree.

gdb/ChangeLog:
2016-11-08  Pedro Alves  <palves@redhat.com>

	* ada-lang.c (ada_read_renaming_var_value): Use expression_up.
	(struct ada_catchpoint_location) <excep_cond_expr>: Now an
	expression_up.
	(ada_catchpoint_location_dtor): Reset excep_cond_expr instead of
	using xfree.
	(create_excep_cond_exprs): Use expression_up and gdb::move.
	(allocate_location_exception): Use new instead of XNEW.
	(should_stop_exception): Likewise.  Adjust to use expression_up.
	(create_ada_exception_catchpoint): Use new instead of XNEW.
	* ax-gdb.c (agent_eval_command_one): Use expression_up instead of
	cleanups.
	(maint_agent_printf_command): Use expression_up.
	* break-catch-sig.c (create_signal_catchpoint): Use new instead of
	XNEW.
	* break-catch-syscall.c (create_syscall_event_catchpoint):
	Likewise.
	* break-catch-throw.c (handle_gnu_v3_exceptions): Use new instead
	of XCNEW.  Use gdb::unique_ptr instead of cleanups.
	* breakpoint.c (set_breakpoint_condition, update_watchpoint)
	(parse_cmd_to_aexpr, watchpoint_check)
	(bpstat_check_breakpoint_conditions, watchpoint_locations_match):
	Adjust to use expression_up.
	(init_bp_location): Adjust.
	(free_bp_location): Use delete instead of xfree.
	(set_raw_breakpoint_without_location, set_raw_breakpoint)
	(add_solib_catchpoint, create_fork_vfork_event_catchpoint)
	(new_single_step_breakpoint, create_breakpoint_sal): Use new
	instead of XNEW.
	(find_condition_and_thread): Adjust to use expression_up.
	(create_breakpoint): Use new instead of XNEW.
	(dtor_watchpoint): Don't xfree expression pointers, they're
	unique_ptr's now.
	(insert_watchpoint, remove_watchpoint): Adjust.
	(watch_command_1): Use expression_up.  Use new instead of XCNEW.
	(catch_exec_command_1): Use new instead of XNEW.
	(bp_location_dtor): Don't xfree expression pointers, they're
	unique_ptr's now.
	(base_breakpoint_allocate_location)
	(strace_marker_create_breakpoints_sal): Use new instead of XNEW.
	(delete_breakpoint): Use delete instead of xfree.
	* breakpoint.h (struct bp_location) <cond>: Now an
	unique_ptr<expression> instead of a raw pointer.
	(struct watchpoint) <exp, cond_exp>: Likewise.
	* cli/cli-script.c (execute_control_command): Use expression_up
	instead of cleanups.
	* dtrace-probe.c (dtrace_process_dof_probe): Use expression_up.
	* eval.c (parse_and_eval_address, parse_and_eval_long)
	(parse_and_eval, parse_to_comma_and_eval, parse_and_eval_type):
	Use expression_up instead of cleanups.
	* expression.h (expression_up): New typedef.
	(parse_expression, parse_expression_with_language, parse_exp_1):
	Change return type to expression_up.
	* mi/mi-main.c (mi_cmd_data_evaluate_expression)
	(print_variable_or_computed): Use expression_up.
	* objc-lang.c (print_object_command): Use expression_up instead of
	cleanups.
	* parse.c (parse_exp_1, parse_exp_in_context)
	(parse_exp_in_context_1, parse_expression)
	(parse_expression_with_language): Return an expression_up instead
	of a raw pointer.
	(parse_expression_for_completion): Use expression_up.
	* printcmd.c (struct display) <exp>: Now an expression_up instead
	of a raw pointer.
	(print_command_1, output_command_const, set_command, x_command):
	Use expression_up instead of cleanups.
	(display_command): Likewise.  Use new instead of XNEW.
	(free_display): Use delete instead of xfree.
	(do_one_display): Adjust to use expression_up.
	* remote.c (remote_download_tracepoint): Likewise.
	* stack.c (return_command): Likewise.
	* tracepoint.c (validate_actionline, encode_actions_1): Use
	expression_up instead of cleanups.
	* typeprint.c (whatis_exp, maintenance_print_type): Likewise.
	* value.c (init_if_undefined_command): Likewise.
	* varobj.c (struct varobj_root) <exp>: Now an expression_up
	instead of a raw pointer.
	(varobj_create): Adjust.
	(varobj_set_value): Use an expression_up instead of cleanups.
	(new_root_variable): Use new instead of XNEW.
	(free_variable): Use delete instead of xfree.
	(value_of_root_1): Use std::swap.
This commit is contained in:
Pedro Alves
2016-11-08 15:26:43 +00:00
parent b064640146
commit 4d01a485d2
23 changed files with 255 additions and 307 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
gdb/ada-lang.c
View File

@@ -4454,17 +4454,10 @@ ada_read_renaming_var_value (struct symbol *renaming_sym,
const struct block *block)
{
const char *sym_name;
struct expression *expr;
struct value *value;
struct cleanup *old_chain = NULL;
sym_name = SYMBOL_LINKAGE_NAME (renaming_sym);
expr = parse_exp_1 (&sym_name, 0, block, 0);
old_chain = make_cleanup (free_current_contents, &expr);
value = evaluate_expression (expr);
do_cleanups (old_chain);
return value;
expression_up expr = parse_exp_1 (&sym_name, 0, block, 0);
return evaluate_expression (expr.get ());
}
@@ -12308,7 +12301,7 @@ struct ada_catchpoint_location
/* The condition that checks whether the exception that was raised
is the specific exception the user specified on catchpoint
creation. */
struct expression *excep_cond_expr;
expression_up excep_cond_expr;
};
/* Implement the DTOR method in the bp_location_ops structure for all
@@ -12319,7 +12312,7 @@ ada_catchpoint_location_dtor (struct bp_location *bl)
{
struct ada_catchpoint_location *al = (struct ada_catchpoint_location *) bl;
xfree (al->excep_cond_expr);
al->excep_cond_expr.reset ();
}
/* The vtable to be used in Ada catchpoint locations. */
@@ -12371,7 +12364,7 @@ create_excep_cond_exprs (struct ada_catchpoint *c)
{
struct ada_catchpoint_location *ada_loc
= (struct ada_catchpoint_location *) bl;
struct expression *exp = NULL;
expression_up exp;
if (!bl->shlib_disabled)
{
@@ -12380,26 +12373,20 @@ create_excep_cond_exprs (struct ada_catchpoint *c)
s = cond_string;
TRY
{
exp = parse_exp_1 (&s, bl->address,
block_for_pc (bl->address), 0);
exp = gdb::move (parse_exp_1 (&s, bl->address,
block_for_pc (bl->address),
0));
}
CATCH (e, RETURN_MASK_ERROR)
{
warning (_("failed to reevaluate internal exception condition "
"for catchpoint %d: %s"),
c->base.number, e.message);
/* There is a bug in GCC on sparc-solaris when building with
optimization which causes EXP to change unexpectedly
(http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56982).
The problem should be fixed starting with GCC 4.9.
In the meantime, work around it by forcing EXP back
to NULL. */
exp = NULL;
}
END_CATCH
}
ada_loc->excep_cond_expr = exp;
ada_loc->excep_cond_expr = gdb::move (exp);
}
do_cleanups (old_chain);
@@ -12427,7 +12414,7 @@ allocate_location_exception (enum ada_exception_catchpoint_kind ex,
{
struct ada_catchpoint_location *loc;
loc = XNEW (struct ada_catchpoint_location);
loc = new ada_catchpoint_location ();
init_bp_location (&loc->base, &ada_catchpoint_location_ops, self);
loc->excep_cond_expr = NULL;
return &loc->base;
@@ -12479,7 +12466,7 @@ should_stop_exception (const struct bp_location *bl)
struct value *mark;
mark = value_mark ();
stop = value_true (evaluate_expression (ada_loc->excep_cond_expr));
stop = value_true (evaluate_expression (ada_loc->excep_cond_expr.get ()));
value_free_to_mark (mark);
}
CATCH (ex, RETURN_MASK_ALL)
@@ -13143,7 +13130,7 @@ create_ada_exception_catchpoint (struct gdbarch *gdbarch,
struct symtab_and_line sal
= ada_exception_sal (ex_kind, excep_string, &addr_string, &ops);
c = XNEW (struct ada_catchpoint);
c = new ada_catchpoint ();
init_ada_exception_breakpoint (&c->base, gdbarch, sal, addr_string,
ops, tempflag, disabled, from_tty);
c->excep_string = excep_string;