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gdb: make bp_locations an std::vector

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Change the type of the global location list, bp_locations, to be an
std::vector.

Adjust the users to deal with that, mostly in an obvious way by using
.data() and .size().  The user where it's slightly less obvious is
update_global_location_list.  There, we std::move the old location list
out of the global vector into a local variable.  The code to fill the
new location list gets simpler, as it's now simply using .push_back(),
no need to count the locations beforehand.

In the rest of update_global_location_list, the code is adjusted to work
with indices instead of `bp_location **`, to iterate on the location
list.  I believe it's a bit easier to understand this way.  But more
importantly, when we build with _GLIBCXX_DEBUG, the operator[] of the
vector does bound checking, so we will know if we ever access past a
vector size (which we won't if we access by raw pointer).  I think that
work can further be done to make that function easier to understand,
notably find better names than "loc" and "loc2" for variables, but
that's work for later.

gdb/ChangeLog:

	* breakpoint.c (bp_locations): Change to std::vector, update all
	users.
	(bp_locations_count): Remove.
	(update_global_location_list): Change to work with indices
	rather than bp_location**.

Change-Id: I193ce40f84d5dc930fbab8867cf946e78ff0df0b
This commit is contained in:
Simon Marchi
2021-05-27 14:58:37 -04:00
parent 40cb8ca539
commit 5d51cd5d14
2 changed files with 40 additions and 58 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
gdb/ChangeLog
View File

@ -1,3 +1,11 @@
2021-05-27 Simon Marchi <simon.marchi@polymtl.ca>
* breakpoint.c (bp_locations): Change to std::vector, update all
users.
(bp_locations_count): Remove.
(update_global_location_list): Change to work with indices
rather than bp_location**.
2021-05-27 Simon Marchi <simon.marchi@polymtl.ca>
* breakpoint.h (bp_locations_range): New.

88
gdb/breakpoint.c
View File

@ -496,8 +496,8 @@ bool target_exact_watchpoints = false;
while executing the block of ALL_BP_LOCATIONS. */
#define ALL_BP_LOCATIONS(B,BP_TMP) \
for (BP_TMP = bp_locations; \
BP_TMP < bp_locations + bp_locations_count && (B = *BP_TMP);\
for (BP_TMP = bp_locations.data (); \
BP_TMP < bp_locations.data () + bp_locations.size () && (B = *BP_TMP);\
BP_TMP++)
/* Iterates through locations with address ADDRESS for the currently selected
@ -510,7 +510,7 @@ bool target_exact_watchpoints = false;
for (BP_LOCP_START = BP_LOCP_START == NULL ? get_first_locp_gte_addr (ADDRESS) : BP_LOCP_START, \
BP_LOCP_TMP = BP_LOCP_START; \
BP_LOCP_START \
&& (BP_LOCP_TMP < bp_locations + bp_locations_count \
&& (BP_LOCP_TMP < bp_locations.data () + bp_locations.size () \
&& (*BP_LOCP_TMP)->address == ADDRESS); \
BP_LOCP_TMP++)
@ -554,11 +554,7 @@ all_tracepoints ()
/* Array is sorted by bp_location_is_less_than - primarily by the ADDRESS. */
static struct bp_location **bp_locations;
/* Number of elements of BP_LOCATIONS. */
static unsigned bp_locations_count;
static std::vector<bp_location *> bp_locations;
/* Maximum alignment offset between bp_target_info.PLACED_ADDRESS and
ADDRESS for the current elements of BP_LOCATIONS which get a valid
@ -827,7 +823,7 @@ get_first_locp_gte_addr (CORE_ADDR address)
/* Find a close match to the first location at ADDRESS. */
locp_found = ((struct bp_location **)
bsearch (&dummy_locp, bp_locations, bp_locations_count,
bsearch (&dummy_locp, bp_locations.data (), bp_locations.size (),
sizeof (struct bp_location **),
bp_locations_compare_addrs));
@ -837,7 +833,7 @@ get_first_locp_gte_addr (CORE_ADDR address)
/* We may have found a location that is at ADDRESS but is not the first in the
location's list. Go backwards (if possible) and locate the first one. */
while ((locp_found - 1) >= bp_locations
while ((locp_found - 1) >= bp_locations.data ()
&& (*(locp_found - 1))->address == address)
locp_found--;
@ -1582,7 +1578,7 @@ breakpoint_xfer_memory (gdb_byte *readbuf, gdb_byte *writebuf,
report higher one. */
bc_l = 0;
bc_r = bp_locations_count;
bc_r = bp_locations.size ();
while (bc_l + 1 < bc_r)
{
struct bp_location *bl;
@ -1627,7 +1623,7 @@ breakpoint_xfer_memory (gdb_byte *readbuf, gdb_byte *writebuf,
/* Now do full processing of the found relevant range of elements. */
for (bc = bc_l; bc < bp_locations_count; bc++)
for (bc = bc_l; bc < bp_locations.size (); bc++)
{
struct bp_location *bl = bp_locations[bc];
@ -11831,7 +11827,6 @@ force_breakpoint_reinsertion (struct bp_location *bl)
static void
update_global_location_list (enum ugll_insert_mode insert_mode)
{
struct bp_location **locp;
/* Last breakpoint location address that was marked for update. */
CORE_ADDR last_addr = 0;
/* Last breakpoint location program space that was marked for update. */
@ -11850,38 +11845,22 @@ update_global_location_list (enum ugll_insert_mode insert_mode)
/* Saved former bp_locations array which we compare against the newly
built bp_locations from the current state of ALL_BREAKPOINTS. */
struct bp_location **old_locp;
unsigned old_locations_count;
gdb::unique_xmalloc_ptr<struct bp_location *> old_locations (bp_locations);
std::vector<bp_location *> old_locations = std::move (bp_locations);
bp_locations.clear ();
old_locations_count = bp_locations_count;
bp_locations = NULL;
bp_locations_count = 0;
for (breakpoint *b : all_breakpoints ())
for (bp_location *loc ATTRIBUTE_UNUSED : b->locations ())
bp_locations_count++;
bp_locations = XNEWVEC (struct bp_location *, bp_locations_count);
locp = bp_locations;
for (breakpoint *b : all_breakpoints ())
for (bp_location *loc : b->locations ())
*locp++ = loc;
bp_locations.push_back (loc);
/* See if we need to "upgrade" a software breakpoint to a hardware
breakpoint. Do this before deciding whether locations are
duplicates. Also do this before sorting because sorting order
depends on location type. */
for (locp = bp_locations;
locp < bp_locations + bp_locations_count;
locp++)
{
bp_location *loc = *locp;
for (bp_location *loc : bp_locations)
if (!loc->inserted && should_be_inserted (loc))
handle_automatic_hardware_breakpoints (loc);
}
std::sort (bp_locations, bp_locations + bp_locations_count,
std::sort (bp_locations.begin (), bp_locations.end (),
bp_location_is_less_than);
bp_locations_target_extensions_update ();
@ -11896,14 +11875,9 @@ update_global_location_list (enum ugll_insert_mode insert_mode)
LOCP is kept in sync with OLD_LOCP, each pointing to the current
and former bp_location array state respectively. */
locp = bp_locations;
for (old_locp = old_locations.get ();
old_locp < old_locations.get () + old_locations_count;
old_locp++)
size_t loc_i = 0;
for (bp_location *old_loc : old_locations)
{
struct bp_location *old_loc = *old_locp;
struct bp_location **loc2p;
/* Tells if 'old_loc' is found among the new locations. If
not, we have to free it. */
int found_object = 0;
@ -11913,28 +11887,28 @@ update_global_location_list (enum ugll_insert_mode insert_mode)
/* Skip LOCP entries which will definitely never be needed.
Stop either at or being the one matching OLD_LOC. */
while (locp < bp_locations + bp_locations_count
&& (*locp)->address < old_loc->address)
locp++;
while (loc_i < bp_locations.size ()
&& bp_locations[loc_i]->address < old_loc->address)
loc_i++;
for (loc2p = locp;
(loc2p < bp_locations + bp_locations_count
&& (*loc2p)->address == old_loc->address);
loc2p++)
for (size_t loc2_i = loc_i;
(loc2_i < bp_locations.size ()
&& bp_locations[loc2_i]->address == old_loc->address);
loc2_i++)
{
/* Check if this is a new/duplicated location or a duplicated
location that had its condition modified. If so, we want to send
its condition to the target if evaluation of conditions is taking
place there. */
if ((*loc2p)->condition_changed == condition_modified
if (bp_locations[loc2_i]->condition_changed == condition_modified
&& (last_addr != old_loc->address
|| last_pspace_num != old_loc->pspace->num))
{
force_breakpoint_reinsertion (*loc2p);
force_breakpoint_reinsertion (bp_locations[loc2_i]);
last_pspace_num = old_loc->pspace->num;
}
if (*loc2p == old_loc)
if (bp_locations[loc2_i] == old_loc)
found_object = 1;
}
@ -11977,12 +11951,12 @@ update_global_location_list (enum ugll_insert_mode insert_mode)
/* OLD_LOC comes from existing struct breakpoint. */
if (bl_address_is_meaningful (old_loc))
{
for (loc2p = locp;
(loc2p < bp_locations + bp_locations_count
&& (*loc2p)->address == old_loc->address);
loc2p++)
for (size_t loc2_i = loc_i;
(loc2_i < bp_locations.size ()
&& bp_locations[loc2_i]->address == old_loc->address);
loc2_i++)
{
struct bp_location *loc2 = *loc2p;
bp_location *loc2 = bp_locations[loc2_i];
if (loc2 == old_loc)
continue;
@ -12121,7 +12095,7 @@ update_global_location_list (enum ugll_insert_mode insert_mode)
awp_loc_first = NULL;
rwp_loc_first = NULL;
bp_location *loc;
bp_location *loc, **locp;
ALL_BP_LOCATIONS (loc, locp)
{
/* ALL_BP_LOCATIONS bp_location has LOC->OWNER always