PR debug/43176
* Makefile.in (var-tracking.o): Depend on pointer-set.h.
* cselib.c (struct expand_value_data): Add dummy field.
(cselib_expand_value_rtx, cselib_expand_value_rtx_cb): Initialize
dummy to false.
(cselib_dummy_expand_value_rtx_cb): New function.
(cselib_expand_value_rtx_1): If evd->dummy is true, don't allocate
any rtl.
* cselib.h (cselib_dummy_expand_value_rtx_cb): New prototype.
* var-tracking.c: Include pointer-set.h.
(variable): Change n_var_parts to char from int. Add
cur_loc_changed and in_changed_variables fields.
(variable_canonicalize): Remove.
(shared_var_p): New inline function.
(unshare_variable): Maintain cur_loc_changed and
in_changed_variables fields. If var was in changed_variables,
replace it there with new_var. Just copy cur_loc instead of
resetting it to something else.
(variable_union): Don't recompute cur_loc. Use shared_var_p.
(dataflow_set_union): Don't call variable_canonicalize.
(loc_cmp): If both x and y are DEBUG_EXPRs, compare uids
of their DEBUG_EXPR_TREE_DECLs.
(canonicalize_loc_order_check): Verify that cur_loc is NULL
and in_changed_variables and cur_loc_changed is false.
(variable_merge_over_cur): Clear cur_loc, in_changed_variables
and cur_loc_changed. Don't update cur_loc here.
(variable_merge_over_src): Don't call variable_canonicalize.
(dataflow_set_preserve_mem_locs): Use shared_var_p. When
removing loc that is equal to cur_loc, clear cur_loc,
set cur_loc_changed and ensure variable_was_changed is called.
(dataflow_set_remove_mem_locs): Use shared_var_p. Only
compare pointers in cur_loc check, if it is equal to loc,
clear cur_loc and set cur_loc_changed. Don't recompute cur_loc here.
(variable_different_p): Remove compare_current_location argument,
don't compare cur_loc.
(dataflow_set_different_1): Adjust variable_different_p caller.
(variable_was_changed): If dv had some var in changed_variables
already, reset in_changed_variables flag for it and propagate
cur_loc_changed over to the new variable. On empty var
always set cur_loc_changed. Set in_changed_variables on whatever
var is added to changed_variables.
(set_slot_part): Clear cur_loc_changed and in_changed_variables.
Use shared_var_p. When removing loc that is equal to cur_loc,
clear cur_loc and set cur_loc_changed. If cur_loc is NULL at the
end, don't set it to something else, just call variable_was_changed.
(delete_slot_part): Use shared_var_p. When cur_loc equals to
loc being removed, clear cur_loc and set cur_loc_changed.
Set cur_loc_changed if all locations have been removed.
(struct expand_loc_callback_data): New type.
(vt_expand_loc_callback): Add dummy mode in which no rtxes are
allocated. Always create SUBREGs if simplify_subreg failed.
Prefer to use cur_loc, when that fails and still in
changed_variables (and seen first time) recompute it. Set
cur_loc_changed of variables which had to change cur_loc and
compute elcd->cur_loc_changed if any of the subexpressions used
had to change cur_loc.
(vt_expand_loc): Adjust to pass arguments in
expand_loc_callback_data structure.
(vt_expand_loc_dummy): New function.
(emitted_notes): New variable.
(emit_note_insn_var_location): For VALUEs and DEBUG_EXPR_DECLs
that weren't used for any other decl in current
emit_notes_for_changes call call vt_expand_loc_dummy to update
cur_loc. For -fno-var-tracking-assignments, set cur_loc to
first loc_chain location if NULL before. Always use just
cur_loc instead of first loc_chain location. When cur_loc_changed
is false, when not --enable-checking=rtl just don't emit any note.
When rtl checking, compute the note and assert it is the same
as previous note. Clear cur_loc_changed and in_changed_variables
at the end before removing from changed_variables.
(check_changed_vars_3): New function.
(emit_notes_for_changes): Traverse changed_vars to call
check_changed_vars_3 on each changed var.
(emit_notes_for_differences_1): Clear cur_loc_changed and
in_changed_variables. Recompute cur_loc of new_var.
(emit_notes_for_differences_2): Clear cur_loc if new variable
appears.
(vt_emit_notes): Initialize and destroy emitted_notes.
From-SVN: r157264
