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* breakpoints.c (insert_bp_location): New function, broken out

Browse source 
from insert_breakpoints.  Work on an bp_location instead of a
	breakpoint.
	(insert_breakpoints): Use it.
This commit is contained in:
Daniel Jacobowitz 2003-11-06 18:26:17 +00:00
parent cf3a9e5b48
commit 879bfdc20d
2 changed files with 370 additions and 340 deletions
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7
gdb/ChangeLog
View file

@ -1,3 +1,10 @@
2003-11-06 Daniel Jacobowitz <drow@mvista.com>
* breakpoints.c (insert_bp_location): New function, broken out
from insert_breakpoints. Work on an bp_location instead of a
breakpoint.
(insert_breakpoints): Use it.
2003-11-06 Daniel Jacobowitz <drow@mvista.com>
* breakpoint.h (struct bp_location): Add section.

703
gdb/breakpoint.c
View file

@ -741,6 +741,342 @@ insert_catchpoint (struct ui_out *uo, void *args)
return 0;
}
/* Insert a low-level "breakpoint" of some type. BPT is the breakpoint.
Any error messages are printed to TMP_ERROR_STREAM; and DISABLED_BREAKS,
PROCESS_WARNING, and HW_BREAKPOINT_ERROR are used to report problems.
NOTE drow/2003-09-09: This routine could be broken down to an object-style
method for each breakpoint or catchpoint type. */
int
insert_bp_location (struct bp_location *bpt,
struct ui_file *tmp_error_stream,
int *disabled_breaks, int *process_warning,
int *hw_breakpoint_error)
{
int val = 0;
/* Permanent breakpoints cannot be inserted or removed. Disabled
breakpoints should not be inserted. */
if (bpt->owner->enable_state != bp_enabled)
return 0;
if (bpt->inserted || bpt->duplicate)
return 0;
if (bpt->loc_type == bp_loc_software_breakpoint
|| bpt->loc_type == bp_loc_hardware_breakpoint)
{
/* First check to see if we have to handle an overlay. */
if (overlay_debugging == ovly_off
|| bpt->section == NULL
|| !(section_is_overlay (bpt->section)))
{
/* No overlay handling: just set the breakpoint. */
if (bpt->loc_type == bp_loc_hardware_breakpoint)
val = target_insert_hw_breakpoint (bpt->address,
bpt->shadow_contents);
else
val = target_insert_breakpoint (bpt->address,
bpt->shadow_contents);
}
else
{
/* This breakpoint is in an overlay section.
Shall we set a breakpoint at the LMA? */
if (!overlay_events_enabled)
{
/* Yes -- overlay event support is not active,
so we must try to set a breakpoint at the LMA.
This will not work for a hardware breakpoint. */
if (bpt->loc_type == bp_loc_hardware_breakpoint)
warning ("hardware breakpoint %d not supported in overlay!\n",
bpt->owner->number);
else
{
CORE_ADDR addr = overlay_unmapped_address (bpt->address,
bpt->section);
/* Set a software (trap) breakpoint at the LMA. */
val = target_insert_breakpoint (addr, bpt->shadow_contents);
if (val != 0)
fprintf_unfiltered (tmp_error_stream,
"Overlay breakpoint %d failed: in ROM?",
bpt->owner->number);
}
}
/* Shall we set a breakpoint at the VMA? */
if (section_is_mapped (bpt->section))
{
/* Yes. This overlay section is mapped into memory. */
if (bpt->loc_type == bp_loc_hardware_breakpoint)
val = target_insert_hw_breakpoint (bpt->address,
bpt->shadow_contents);
else
val = target_insert_breakpoint (bpt->address,
bpt->shadow_contents);
}
else
{
/* No. This breakpoint will not be inserted.
No error, but do not mark the bp as 'inserted'. */
return 0;
}
}
if (val)
{
/* Can't set the breakpoint. */
#if defined (DISABLE_UNSETTABLE_BREAK)
if (DISABLE_UNSETTABLE_BREAK (bpt->address))
{
/* See also: disable_breakpoints_in_shlibs. */
val = 0;
bpt->owner->enable_state = bp_shlib_disabled;
if (!*disabled_breaks)
{
fprintf_unfiltered (tmp_error_stream,
"Cannot insert breakpoint %d.\n",
bpt->owner->number);
fprintf_unfiltered (tmp_error_stream,
"Temporarily disabling shared library breakpoints:\n");
}
*disabled_breaks = 1;
fprintf_unfiltered (tmp_error_stream,
"breakpoint #%d\n", bpt->owner->number);
}
else
#endif
{
#ifdef ONE_PROCESS_WRITETEXT
*process_warning = 1;
#endif
if (bpt->loc_type == bp_loc_hardware_breakpoint)
{
*hw_breakpoint_error = 1;
fprintf_unfiltered (tmp_error_stream,
"Cannot insert hardware breakpoint %d.\n",
bpt->owner->number);
}
else
{
fprintf_unfiltered (tmp_error_stream,
"Cannot insert breakpoint %d.\n",
bpt->owner->number);
fprintf_filtered (tmp_error_stream,
"Error accessing memory address ");
print_address_numeric (bpt->address, 1, tmp_error_stream);
fprintf_filtered (tmp_error_stream, ": %s.\n",
safe_strerror (val));
}
}
}
else
bpt->inserted = 1;
return val;
}
else if (bpt->loc_type == bp_loc_hardware_watchpoint
/* NOTE drow/2003-09-08: This state only exists for removing
watchpoints. It's not clear that it's necessary... */
&& bpt->owner->disposition != disp_del_at_next_stop)
{
/* FIXME drow/2003-09-08: This code sets multiple hardware watchpoints
based on the expression. Ideally this should happen at a higher level,
and there should be one bp_location for each computed address we
must watch. As soon as a many-to-one mapping is available I'll
convert this. */
struct frame_info *saved_frame;
int saved_level, within_current_scope;
struct value *mark = value_mark ();
struct value *v;
/* Save the current frame and level so we can restore it after
evaluating the watchpoint expression on its own frame. */
/* FIXME drow/2003-09-09: It would be nice if evaluate_expression
took a frame parameter, so that we didn't have to change the
selected frame. */
saved_frame = deprecated_selected_frame;
saved_level = frame_relative_level (deprecated_selected_frame);
/* Determine if the watchpoint is within scope. */
if (bpt->owner->exp_valid_block == NULL)
within_current_scope = 1;
else
{
struct frame_info *fi;
fi = frame_find_by_id (bpt->owner->watchpoint_frame);
within_current_scope = (fi != NULL);
if (within_current_scope)
select_frame (fi);
}
if (within_current_scope)
{
/* Evaluate the expression and cut the chain of values
produced off from the value chain.
Make sure the value returned isn't lazy; we use
laziness to determine what memory GDB actually needed
in order to compute the value of the expression. */
v = evaluate_expression (bpt->owner->exp);
VALUE_CONTENTS (v);
value_release_to_mark (mark);
bpt->owner->val_chain = v;
bpt->inserted = 1;
/* Look at each value on the value chain. */
for (; v; v = v->next)
{
/* If it's a memory location, and GDB actually needed
its contents to evaluate the expression, then we
must watch it. */
if (VALUE_LVAL (v) == lval_memory
&& ! VALUE_LAZY (v))
{
struct type *vtype = check_typedef (VALUE_TYPE (v));
/* We only watch structs and arrays if user asked
for it explicitly, never if they just happen to
appear in the middle of some value chain. */
if (v == bpt->owner->val_chain
|| (TYPE_CODE (vtype) != TYPE_CODE_STRUCT
&& TYPE_CODE (vtype) != TYPE_CODE_ARRAY))
{
CORE_ADDR addr;
int len, type;
addr = VALUE_ADDRESS (v) + VALUE_OFFSET (v);
len = TYPE_LENGTH (VALUE_TYPE (v));
type = hw_write;
if (bpt->owner->type == bp_read_watchpoint)
type = hw_read;
else if (bpt->owner->type == bp_access_watchpoint)
type = hw_access;
val = target_insert_watchpoint (addr, len, type);
if (val == -1)
{
/* Don't exit the loop, try to insert
every value on the value chain. That's
because we will be removing all the
watches below, and removing a
watchpoint we didn't insert could have
adverse effects. */
bpt->inserted = 0;
}
val = 0;
}
}
}
/* Failure to insert a watchpoint on any memory value in the
value chain brings us here. */
if (!bpt->inserted)
{
remove_breakpoint (bpt->owner, mark_uninserted);
*hw_breakpoint_error = 1;
fprintf_unfiltered (tmp_error_stream,
"Could not insert hardware watchpoint %d.\n",
bpt->owner->number);
val = -1;
}
}
else
{
printf_filtered ("Hardware watchpoint %d deleted ", bpt->owner->number);
printf_filtered ("because the program has left the block \n");
printf_filtered ("in which its expression is valid.\n");
if (bpt->owner->related_breakpoint)
bpt->owner->related_breakpoint->disposition = disp_del_at_next_stop;
bpt->owner->disposition = disp_del_at_next_stop;
}
/* Restore the frame and level. */
if (saved_frame != deprecated_selected_frame
|| saved_level != frame_relative_level (deprecated_selected_frame))
select_frame (saved_frame);
return val;
}
else if (ep_is_exception_catchpoint (bpt->owner))
{
/* FIXME drow/2003-09-09: This code sets both a catchpoint and a
breakpoint. Once again, it would be better if this was represented
as two bp_locations. */
/* If we get here, we must have a callback mechanism for exception
events -- with g++ style embedded label support, we insert
ordinary breakpoints and not catchpoints. */
val = target_insert_breakpoint (bpt->address, bpt->shadow_contents);
if (val)
{
/* Couldn't set breakpoint for some reason */
fprintf_unfiltered (tmp_error_stream,
"Cannot insert catchpoint %d; disabling it.\n",
bpt->owner->number);
fprintf_filtered (tmp_error_stream,
"Error accessing memory address ");
print_address_numeric (bpt->address, 1, tmp_error_stream);
fprintf_filtered (tmp_error_stream, ": %s.\n",
safe_strerror (val));
bpt->owner->enable_state = bp_disabled;
}
else
{
/* Bp set, now make sure callbacks are enabled */
/* Format possible error msg */
char *message = xstrprintf ("Error inserting catchpoint %d:\n",
bpt->owner->number);
struct cleanup *cleanups = make_cleanup (xfree, message);
int val;
args_for_catchpoint_enable args;
args.kind = bpt->owner->type == bp_catch_catch ?
EX_EVENT_CATCH : EX_EVENT_THROW;
args.enable_p = 1;
val = catch_errors (cover_target_enable_exception_callback,
&args, message, RETURN_MASK_ALL);
do_cleanups (cleanups);
if (val != 0 && val != -1)
bpt->inserted = 1;
/* Check if something went wrong; val == 0 can be ignored */
if (val == -1)
{
/* something went wrong */
fprintf_unfiltered (tmp_error_stream,
"Cannot insert catchpoint %d; disabling it.\n",
bpt->owner->number);
bpt->owner->enable_state = bp_disabled;
}
}
return val;
}
else if (bpt->owner->type == bp_catch_fork
|| bpt->owner->type == bp_catch_vfork
|| bpt->owner->type == bp_catch_exec)
{
char *prefix = xstrprintf ("warning: inserting catchpoint %d: ",
bpt->owner->number);
struct cleanup *cleanups = make_cleanup (xfree, prefix);
val = catch_exceptions (uiout, insert_catchpoint, bpt->owner, prefix,
RETURN_MASK_ERROR);
do_cleanups (cleanups);
if (val < 0)
bpt->owner->enable_state = bp_disabled;
else
bpt->inserted = 1;
return val;
}
return 0;
}
/* insert_breakpoints is used when starting or continuing the program.
remove_breakpoints is used when the program stops.
Both return zero if successful,
@ -749,14 +1085,12 @@ insert_catchpoint (struct ui_out *uo, void *args)
int
insert_breakpoints (void)
{
struct breakpoint *b, *temp;
struct bp_location *b, *temp;
int return_val = 0; /* return success code. */
int val = 0;
int disabled_breaks = 0;
int hw_breakpoint_error = 0;
#ifdef ONE_PROCESS_WRITETEXT
int process_warning = 0;
#endif
struct ui_file *tmp_error_stream = mem_fileopen ();
make_cleanup_ui_file_delete (tmp_error_stream);
@ -765,349 +1099,38 @@ insert_breakpoints (void)
there was an error. */
fprintf_unfiltered (tmp_error_stream, "Warning:\n");
ALL_BREAKPOINTS_SAFE (b, temp)
{
/* Permanent breakpoints cannot be inserted or removed. Disabled
breakpoints should not be inserted. */
if (b->enable_state != bp_enabled)
continue;
ALL_BP_LOCATIONS_SAFE (b, temp)
{
/* Permanent breakpoints cannot be inserted or removed. Disabled
breakpoints should not be inserted. */
if (b->owner->enable_state != bp_enabled)
continue;
if ((b->type == bp_watchpoint
|| b->type == bp_hardware_watchpoint
|| b->type == bp_read_watchpoint
|| b->type == bp_access_watchpoint) && (!b->val))
{
struct value *val;
val = evaluate_expression (b->exp);
release_value (val);
if (VALUE_LAZY (val))
value_fetch_lazy (val);
b->val = val;
}
if (b->type != bp_watchpoint
&& b->type != bp_hardware_watchpoint
&& b->type != bp_read_watchpoint
&& b->type != bp_access_watchpoint
&& b->type != bp_catch_fork
&& b->type != bp_catch_vfork
&& b->type != bp_catch_exec
&& b->type != bp_catch_throw
&& b->type != bp_catch_catch
&& !b->loc->inserted
&& !b->loc->duplicate)
{
/* "Normal" instruction breakpoint: either the standard
trap-instruction bp (bp_breakpoint), or a
bp_hardware_breakpoint. */
/* FIXME drow/2003-10-07: This code should be pushed elsewhere when
hardware watchpoints are split into multiple loc breakpoints. */
if ((b->loc_type == bp_loc_hardware_watchpoint
|| b->owner->type == bp_watchpoint) && !b->owner->val)
{
struct value *val;
val = evaluate_expression (b->owner->exp);
release_value (val);
if (VALUE_LAZY (val))
value_fetch_lazy (val);
b->owner->val = val;
}
/* First check to see if we have to handle an overlay. */
if (overlay_debugging == ovly_off
|| b->loc->section == NULL
|| !(section_is_overlay (b->loc->section)))
{
/* No overlay handling: just set the breakpoint. */
val = insert_bp_location (b, tmp_error_stream,
&disabled_breaks, &process_warning,
&hw_breakpoint_error);
if (val)
return_val = val;
}
if (b->type == bp_hardware_breakpoint)
val = target_insert_hw_breakpoint (b->loc->address,
b->loc->shadow_contents);
else
val = target_insert_breakpoint (b->loc->address, b->loc->shadow_contents);
}
else
{
/* This breakpoint is in an overlay section.
Shall we set a breakpoint at the LMA? */
if (!overlay_events_enabled)
{
/* Yes -- overlay event support is not active,
so we must try to set a breakpoint at the LMA.
This will not work for a hardware breakpoint. */
if (b->type == bp_hardware_breakpoint)
warning ("hardware breakpoint %d not supported in overlay!\n",
b->number);
else
{
CORE_ADDR addr = overlay_unmapped_address (b->loc->address,
b->loc->section);
/* Set a software (trap) breakpoint at the LMA. */
val = target_insert_breakpoint (addr, b->loc->shadow_contents);
if (val != 0)
fprintf_unfiltered (tmp_error_stream,
"Overlay breakpoint %d failed: in ROM?",
b->number);
}
}
/* Shall we set a breakpoint at the VMA? */
if (section_is_mapped (b->loc->section))
{
/* Yes. This overlay section is mapped into memory. */
if (b->type == bp_hardware_breakpoint)
val = target_insert_hw_breakpoint (b->loc->address,
b->loc->shadow_contents);
else
val = target_insert_breakpoint (b->loc->address,
b->loc->shadow_contents);
}
else
{
/* No. This breakpoint will not be inserted.
No error, but do not mark the bp as 'inserted'. */
continue;
}
}
if (val)
{
/* Can't set the breakpoint. */
#if defined (DISABLE_UNSETTABLE_BREAK)
if (DISABLE_UNSETTABLE_BREAK (b->loc->address))
{
/* See also: disable_breakpoints_in_shlibs. */
val = 0;
b->enable_state = bp_shlib_disabled;
if (!disabled_breaks)
{
fprintf_unfiltered (tmp_error_stream,
"Cannot insert breakpoint %d.\n",
b->number);
fprintf_unfiltered (tmp_error_stream,
"Temporarily disabling shared library breakpoints:\n");
}
disabled_breaks = 1;
fprintf_unfiltered (tmp_error_stream,
"breakpoint #%d\n", b->number);
}
else
#endif
{
#ifdef ONE_PROCESS_WRITETEXT
process_warning = 1;
#endif
if (b->type == bp_hardware_breakpoint)
{
hw_breakpoint_error = 1;
fprintf_unfiltered (tmp_error_stream,
"Cannot insert hardware breakpoint %d.\n",
b->number);
}
else
{
fprintf_unfiltered (tmp_error_stream,
"Cannot insert breakpoint %d.\n",
b->number);
fprintf_filtered (tmp_error_stream,
"Error accessing memory address ");
print_address_numeric (b->loc->address, 1, tmp_error_stream);
fprintf_filtered (tmp_error_stream, ": %s.\n",
safe_strerror (val));
}
}
}
else
b->loc->inserted = 1;
if (val)
return_val = val; /* remember failure */
}
else if (ep_is_exception_catchpoint (b)
&& !b->loc->inserted
&& !b->loc->duplicate)
{
/* If we get here, we must have a callback mechanism for exception
events -- with g++ style embedded label support, we insert
ordinary breakpoints and not catchpoints. */
val = target_insert_breakpoint (b->loc->address, b->loc->shadow_contents);
if (val)
{
/* Couldn't set breakpoint for some reason */
fprintf_unfiltered (tmp_error_stream,
"Cannot insert catchpoint %d; disabling it.\n",
b->number);
fprintf_filtered (tmp_error_stream,
"Error accessing memory address ");
print_address_numeric (b->loc->address, 1, tmp_error_stream);
fprintf_filtered (tmp_error_stream, ": %s.\n",
safe_strerror (val));
b->enable_state = bp_disabled;
}
else
{
/* Bp set, now make sure callbacks are enabled */
/* Format possible error msg */
char *message = xstrprintf ("Error inserting catchpoint %d:\n",
b->number);
struct cleanup *cleanups = make_cleanup (xfree, message);
int val;
args_for_catchpoint_enable args;
args.kind = b->type == bp_catch_catch ?
EX_EVENT_CATCH : EX_EVENT_THROW;
args.enable_p = 1;
val = catch_errors (cover_target_enable_exception_callback,
&args, message, RETURN_MASK_ALL);
do_cleanups (cleanups);
if (val != 0 && val != -1)
{
b->loc->inserted = 1;
}
/* Check if something went wrong; val == 0 can be ignored */
if (val == -1)
{
/* something went wrong */
fprintf_unfiltered (tmp_error_stream,
"Cannot insert catchpoint %d; disabling it.\n",
b->number);
b->enable_state = bp_disabled;
}
}
if (val)
return_val = val; /* remember failure */
}
else if ((b->type == bp_hardware_watchpoint ||
b->type == bp_read_watchpoint ||
b->type == bp_access_watchpoint)
&& b->disposition != disp_del_at_next_stop
&& !b->loc->inserted
&& !b->loc->duplicate)
{
struct frame_info *saved_frame;
int saved_level, within_current_scope;
struct value *mark = value_mark ();
struct value *v;
/* Save the current frame and level so we can restore it after
evaluating the watchpoint expression on its own frame. */
saved_frame = deprecated_selected_frame;
saved_level = frame_relative_level (deprecated_selected_frame);
/* Determine if the watchpoint is within scope. */
if (b->exp_valid_block == NULL)
within_current_scope = 1;
else
{
struct frame_info *fi;
fi = frame_find_by_id (b->watchpoint_frame);
within_current_scope = (fi != NULL);
if (within_current_scope)
select_frame (fi);
}
if (within_current_scope)
{
/* Evaluate the expression and cut the chain of values
produced off from the value chain.
Make sure the value returned isn't lazy; we use
laziness to determine what memory GDB actually needed
in order to compute the value of the expression. */
v = evaluate_expression (b->exp);
VALUE_CONTENTS(v);
value_release_to_mark (mark);
b->val_chain = v;
b->loc->inserted = 1;
/* Look at each value on the value chain. */
for (; v; v = v->next)
{
/* If it's a memory location, and GDB actually needed
its contents to evaluate the expression, then we
must watch it. */
if (VALUE_LVAL (v) == lval_memory
&& ! VALUE_LAZY (v))
{
struct type *vtype = check_typedef (VALUE_TYPE (v));
/* We only watch structs and arrays if user asked
for it explicitly, never if they just happen to
appear in the middle of some value chain. */
if (v == b->val_chain
|| (TYPE_CODE (vtype) != TYPE_CODE_STRUCT
&& TYPE_CODE (vtype) != TYPE_CODE_ARRAY))
{
CORE_ADDR addr;
int len, type;
addr = VALUE_ADDRESS (v) + VALUE_OFFSET (v);
len = TYPE_LENGTH (VALUE_TYPE (v));
type = hw_write;
if (b->type == bp_read_watchpoint)
type = hw_read;
else if (b->type == bp_access_watchpoint)
type = hw_access;
val = target_insert_watchpoint (addr, len, type);
if (val == -1)
{
/* Don't exit the loop, try to insert
every value on the value chain. That's
because we will be removing all the
watches below, and removing a
watchpoint we didn't insert could have
adverse effects. */
b->loc->inserted = 0;
}
val = 0;
}
}
}
/* Failure to insert a watchpoint on any memory value in the
value chain brings us here. */
if (!b->loc->inserted)
{
remove_breakpoint (b, mark_uninserted);
hw_breakpoint_error = 1;
fprintf_unfiltered (tmp_error_stream,
"Could not insert hardware watchpoint %d.\n",
b->number);
val = -1;
}
}
else
{
printf_filtered ("Hardware watchpoint %d deleted ", b->number);
printf_filtered ("because the program has left the block \n");
printf_filtered ("in which its expression is valid.\n");
if (b->related_breakpoint)
b->related_breakpoint->disposition = disp_del_at_next_stop;
b->disposition = disp_del_at_next_stop;
}
/* Restore the frame and level. */
if ((saved_frame != deprecated_selected_frame) ||
(saved_level != frame_relative_level (deprecated_selected_frame)))
select_frame (saved_frame);
if (val)
return_val = val; /* remember failure */
}
else if ((b->type == bp_catch_fork
|| b->type == bp_catch_vfork
|| b->type == bp_catch_exec)
&& !b->loc->inserted
&& !b->loc->duplicate)
{
char *prefix = xstrprintf ("warning: inserting catchpoint %d: ",
b->number);
struct cleanup *cleanups = make_cleanup (xfree, prefix);
val = catch_exceptions (uiout, insert_catchpoint, b, prefix,
RETURN_MASK_ERROR);
do_cleanups (cleanups);
if (val < 0)
b->enable_state = bp_disabled;
else
b->loc->inserted = 1;
}
}
if (return_val)
if (return_val)
{
/* If a hardware breakpoint or watchpoint was inserted, add a
message about possibly exhausted resources. */
if (hw_breakpoint_error)
if (hw_breakpoint_error)
{
fprintf_unfiltered (tmp_error_stream,
"Could not insert hardware breakpoints:\n\