eliminate_dom_walker Class Reference

Inheritance diagram for eliminate_dom_walker:

Collaboration diagram for eliminate_dom_walker:

Public Types
enum	reachability { ALL_BLOCKS , REACHABLE_BLOCKS , REACHABLE_BLOCKS_PRESERVING_FLAGS }

Public Member Functions
	eliminate_dom_walker (cdi_direction, bitmap)
	~eliminate_dom_walker ()
edge	before_dom_children (basic_block) final override
void	after_dom_children (basic_block) final override
virtual tree	eliminate_avail (basic_block, tree op)
virtual void	eliminate_push_avail (basic_block, tree op)
tree	eliminate_insert (basic_block, gimple_stmt_iterator *gsi, tree val)
void	eliminate_stmt (basic_block, gimple_stmt_iterator *)
unsigned	eliminate_cleanup (bool region_p=false)
void	walk (basic_block)

Data Fields
bool	do_pre
unsigned int	el_todo
unsigned int	eliminations
unsigned int	insertions
bitmap	inserted_exprs
bitmap	need_eh_cleanup
bitmap	need_ab_cleanup
auto_vec< gimple * >	to_remove
auto_vec< gimple * >	to_fixup
auto_vec< tree >	avail
auto_vec< tree >	avail_stack

Static Public Attributes
static const edge	STOP = (edge)-1

Private Member Functions
bool	bb_reachable (struct function *, basic_block)
void	propagate_unreachable_to_edges (basic_block, FILE *, dump_flags_t)

Private Attributes
enum cdi_direction	m_dom_direction: 2
enum reachability	m_reachability: 2
bool	m_user_bb_to_rpo
basic_block	m_unreachable_dom
int *	m_bb_to_rpo

Detailed Description

Elimination engine.   

Member Enumeration Documentation

reachability

enum dom_walker::reachability

inherited

Enumerator
ALL_BLOCKS
REACHABLE_BLOCKS
REACHABLE_BLOCKS_PRESERVING_FLAGS

Constructor & Destructor Documentation

eliminate_dom_walker()

eliminate_dom_walker::eliminate_dom_walker	(	cdi_direction	direction,
		bitmap	inserted_exprs_ )

References BITMAP_ALLOC, need_ab_cleanup, need_eh_cleanup, and NULL.

~eliminate_dom_walker()

eliminate_dom_walker::~eliminate_dom_walker

(

)

References BITMAP_FREE, need_ab_cleanup, and need_eh_cleanup.

Member Function Documentation

after_dom_children()

void eliminate_dom_walker::after_dom_children ( basic_block )

finaloverridevirtual

Make no longer available leaders no longer available.   

Reimplemented from dom_walker.

References avail, avail_stack, NULL_TREE, SSA_NAME_VERSION, vn_ssa_aux::valnum, and VN_INFO().

bb_reachable()

bool dom_walker::bb_reachable ( struct function * fun, basic_block bb )

privateinherited

Return TRUE if BB is reachable, false otherwise.   

References dom_walker::ALL_BLOCKS, CDI_DOMINATORS, dominated_by_p(), ENTRY_BLOCK_PTR_FOR_FN, FOR_EACH_EDGE, ggc_alloc(), dom_walker::m_reachability, dom_walker::m_unreachable_dom, and basic_block_def::preds.

Referenced by dom_walker::walk().

before_dom_children()

edge eliminate_dom_walker::before_dom_children ( basic_block b )

finaloverridevirtual

Perform elimination for the basic-block B during the domwalk.   

Reimplemented from dom_walker.

References avail_stack, b, BB_EXECUTABLE, bitmap_bit_p, dump_file, dump_flags, eliminate_avail(), eliminate_push_avail(), eliminate_stmt(), eliminations, fold_convert, FOR_EACH_EDGE, ggc_alloc(), gimple_build_assign(), gsi_after_labels(), gsi_end_p(), gsi_insert_before(), GSI_NEW_STMT, gsi_next(), gsi_start_bb(), gsi_start_phis(), inserted_exprs, may_propagate_copy(), NULL, NULL_TREE, PHI_ARG_DEF_PTR_FROM_EDGE, PHI_RESULT, print_generic_expr(), propagate_value(), remove_phi_node(), SSA_NAME_VERSION, TDF_DETAILS, to_remove, TREE_CODE, TREE_TYPE, USE_FROM_PTR, useless_type_conversion_p(), virtual_operand_p(), and vn_context_bb.

eliminate_avail()

tree eliminate_dom_walker::eliminate_avail ( basic_block , tree op )

virtual

Return a leader for OP that is available at the current point of the
eliminate domwalk.   

Reimplemented in rpo_elim.

References avail, CONSTANT_CLASS_P, ggc_alloc(), gimple_assign_rhs1(), gimple_assign_rhs_class(), GIMPLE_SINGLE_RHS, is_gimple_min_invariant(), NULL_TREE, SSA_NAME_DEF_STMT, SSA_NAME_IS_DEFAULT_DEF, SSA_NAME_OCCURS_IN_ABNORMAL_PHI, SSA_NAME_VERSION, TREE_CODE, vn_ssa_aux::valnum, and VN_INFO().

Referenced by before_dom_children(), eliminate_cleanup(), eliminate_insert(), eliminate_stmt(), rpo_vn_valueize(), visit_nary_op(), and vn_lookup_simplify_result().

eliminate_cleanup()

unsigned eliminate_dom_walker::eliminate_cleanup

(

bool

region_p = false

)

Remove queued stmts and perform delayed cleanups.   

References bitmap_empty_p(), bitmap_set_bit, cfun, dump_file, dump_flags, el_todo, eliminate_avail(), eliminations, fixup_noreturn_call(), ggc_alloc(), gimple_assign_set_rhs_from_tree(), gimple_bb(), gimple_build_assign(), gimple_get_lhs(), gimple_phi_result(), gimple_purge_all_dead_abnormal_call_edges(), gimple_purge_all_dead_eh_edges(), gsi_after_labels(), gsi_for_stmt(), gsi_insert_before(), gsi_remove(), GSI_SAME_STMT, gsi_stmt(), has_zero_uses(), basic_block_def::index, insertions, is_gimple_assign(), is_gimple_call(), maybe_clean_or_replace_eh_stmt(), need_ab_cleanup, need_eh_cleanup, print_gimple_stmt(), release_defs(), remove_phi_node(), statistics_counter_event(), stmt_can_make_abnormal_goto(), TDF_DETAILS, TDF_NONE, to_fixup, to_remove, TODO_cleanup_cfg, TREE_CODE, unlink_stmt_vdef(), and update_stmt().

Referenced by do_rpo_vn_1().

eliminate_insert()

tree eliminate_dom_walker::eliminate_insert	(	basic_block	bb,
		gimple_stmt_iterator *	gsi,
		tree	val )

Insert the expression recorded by SCCVN for VAL at *GSI.  Returns
the leader for the expression if insertion was successful.   

References CONVERT_EXPR_CODE_P, dump_file, dump_flags, eliminate_avail(), vn_ssa_aux::expr, ggc_alloc(), gimple_assign_rhs1(), gimple_assign_rhs2(), gimple_assign_rhs_code(), gimple_bb(), gimple_build(), gimple_seq_discard(), gimple_seq_first_stmt(), gimple_seq_singleton_p(), gsi_insert_seq_before(), GSI_SAME_STMT, insertions, NULL, NULL_TREE, print_generic_expr(), print_gimple_stmt(), SSA_NAME_DEF_STMT, SSA_NAME_IS_DEFAULT_DEF, TDF_DETAILS, TREE_CODE, TREE_OPERAND, TREE_TYPE, and VN_INFO().

Referenced by eliminate_stmt().

eliminate_push_avail()

void eliminate_dom_walker::eliminate_push_avail ( basic_block , tree op )

virtual

At the current point of the eliminate domwalk make OP available.   

Reimplemented in rpo_elim.

References avail, avail_stack, ggc_alloc(), SSA_NAME_VERSION, TREE_CODE, vn_ssa_aux::valnum, and VN_INFO().

Referenced by before_dom_children(), and eliminate_stmt().

eliminate_stmt()

void eliminate_dom_walker::eliminate_stmt	(	basic_block	b,
		gimple_stmt_iterator *	gsi )

References alias_set_subset_of(), ao_ref_alias_set(), ao_ref_base_alias_set(), ao_ref_init(), b, bit_from_pos(), bitmap_bit_p, bitmap_set_bit, build2(), build3(), build_nonstandard_integer_type(), builtin_decl_unreachable(), cfun, component_ref_field_offset(), CONVERT_EXPR_CODE_P, current_function_decl, dbg_cnt(), DECL_BIT_FIELD_TYPE, DECL_FIELD_BIT_OFFSET, DECL_HARD_REGISTER, lang_hooks::decl_printable_name, do_pre, dump_enabled_p(), dump_file, dump_flags, dump_possible_polymorphic_call_targets(), dump_printf_loc(), duplicate_ssa_name_ptr_info(), duplicate_ssa_name_range_info(), EDGE_SUCC, el_todo, eliminate_avail(), eliminate_insert(), eliminate_push_avail(), eliminations, flow_bb_inside_loop_p(), fold_convert, fold_stmt(), follow_all_ssa_edges(), FOR_EACH_SSA_TREE_OPERAND, FOR_EACH_SSA_USE_OPERAND, FUNC_OR_METHOD_TYPE_P, gcc_assert, gcc_unreachable, ipa_polymorphic_call_context::get_dynamic_type(), ggc_alloc(), gimple_assign_lhs(), gimple_assign_load_p(), gimple_assign_rhs1(), gimple_assign_rhs_code(), gimple_assign_single_p(), gimple_bb(), gimple_call_fn(), gimple_call_noreturn_p(), gimple_call_set_fndecl(), gimple_call_set_fntype(), gimple_cond_false_p(), gimple_cond_make_false(), gimple_cond_make_true(), gimple_cond_true_p(), gimple_get_lhs(), gimple_has_volatile_ops(), gimple_nop_p(), gimple_switch_index(), gimple_vdef(), gimple_vuse(), gsi_end_p(), gsi_next(), gsi_prev(), gsi_start_bb(), gsi_stmt(), has_VN_INFO(), has_zero_uses(), inserted_exprs, INTEGRAL_TYPE_P, is_gimple_assign(), is_gimple_call(), is_gimple_debug(), is_gimple_min_invariant(), is_gimple_reg(), is_global_var(), loop_outer(), MAX_FIXED_MODE_SIZE, may_propagate_copy(), maybe_clean_or_replace_eh_stmt(), maybe_remove_unused_call_args(), MSG_OPTIMIZED_LOCATIONS, need_ab_cleanup, need_eh_cleanup, NULL, NULL_TREE, loop::num, obj_type_ref_class(), OBJ_TYPE_REF_OBJECT, OBJ_TYPE_REF_TOKEN, operand_equal_p(), POINTER_TYPE_P, poly_int_tree_p(), possible_polymorphic_call_targets(), print_generic_expr(), print_gimple_expr(), print_gimple_stmt(), propagate_tree_value_into_stmt(), propagate_value(), recompute_tree_invariant_for_addr_expr(), reset_flow_sensitive_info(), simple_iv(), SSA_NAME_DEF_STMT, SSA_NAME_IN_FREE_LIST, SSA_NAME_IS_DEFAULT_DEF, SSA_NAME_PTR_INFO, SSA_NAME_RANGE_INFO, SSA_NAME_VERSION, SSA_OP_ALL_DEFS, SSA_OP_DEF, SSA_OP_USE, stmt_can_make_abnormal_goto(), TDF_DETAILS, to_fixup, to_remove, TODO_cleanup_cfg, TREE_CODE, TREE_INT_CST_LOW, TREE_OPERAND, tree_to_uhwi(), TREE_TYPE, TREE_VALUE, TYPE_ARG_TYPES, type_has_mode_precision_p(), TYPE_PRECISION, TYPE_SIZE, TYPE_UNSIGNED, update_stmt(), USE_FROM_PTR, useless_type_conversion_p(), vn_ssa_aux::valnum, virtual_method_call_p(), VN_INFO(), vn_reference_lookup(), VN_TOP, VN_WALKREWRITE, void_type_node, and VOID_TYPE_P.

Referenced by before_dom_children(), and process_bb().

propagate_unreachable_to_edges()

void dom_walker::propagate_unreachable_to_edges ( basic_block bb, FILE * dump_file, dump_flags_t dump_flags )

privateinherited

BB has been determined to be unreachable.  Propagate that property
to incoming and outgoing edges of BB as appropriate.   

References CDI_DOMINATORS, dominated_by_p(), dump_file, dump_flags, FOR_EACH_EDGE, ggc_alloc(), basic_block_def::index, dom_walker::m_unreachable_dom, basic_block_def::preds, basic_block_def::succs, and TDF_DETAILS.

Referenced by dom_walker::walk().

walk()

void dom_walker::walk ( basic_block bb )

inherited

Recursively walk the dominator tree.
BB is the basic block we are currently visiting.   

References dom_walker::after_dom_children(), dom_walker::bb_reachable(), dom_walker::before_dom_children(), CDI_DOMINATORS, cfun, dump_file, dump_flags, EDGE_COUNT, ENTRY_BLOCK_PTR_FOR_FN, EXIT_BLOCK_PTR_FOR_FN, first_dom_son(), FOR_EACH_EDGE, free(), ggc_alloc(), i, last_basic_block_for_fn, dom_walker::m_bb_to_rpo, dom_walker::m_dom_direction, dom_walker::m_reachability, dom_walker::m_unreachable_dom, dom_walker::m_user_bb_to_rpo, n_basic_blocks_for_fn, next_dom_son(), NULL, pre_and_rev_post_order_compute(), basic_block_def::preds, dom_walker::propagate_unreachable_to_edges(), dom_walker::REACHABLE_BLOCKS, set_all_edges_as_executable(), sort_bbs_postorder(), dom_walker::STOP, basic_block_def::succs, and worklist.

Referenced by find_comparisons(), get_non_trapping(), ipa_analyze_node(), and rewrite_blocks().

Field Documentation

avail

auto_vec<tree> eliminate_dom_walker::avail

Referenced by after_dom_children(), eliminate_avail(), and eliminate_push_avail().

avail_stack

auto_vec<tree> eliminate_dom_walker::avail_stack

Referenced by after_dom_children(), before_dom_children(), and eliminate_push_avail().

do_pre

bool eliminate_dom_walker::do_pre

Referenced by eliminate_stmt().

el_todo

unsigned int eliminate_dom_walker::el_todo

Referenced by eliminate_cleanup(), and eliminate_stmt().

eliminations

unsigned int eliminate_dom_walker::eliminations

Referenced by before_dom_children(), eliminate_cleanup(), eliminate_stmt(), and process_bb().

inserted_exprs

bitmap eliminate_dom_walker::inserted_exprs

Referenced by before_dom_children(), and eliminate_stmt().

insertions

unsigned int eliminate_dom_walker::insertions

Referenced by eliminate_cleanup(), and eliminate_insert().

m_bb_to_rpo

int* dom_walker::m_bb_to_rpo

privateinherited

Referenced by dom_walker::walk(), and dom_walker::~dom_walker().

m_dom_direction

enum cdi_direction dom_walker::m_dom_direction

privateinherited

Referenced by dom_walker::walk().

m_reachability

enum reachability dom_walker::m_reachability

privateinherited

Referenced by dom_walker::bb_reachable(), and dom_walker::walk().

m_unreachable_dom

basic_block dom_walker::m_unreachable_dom

privateinherited

Referenced by dom_walker::bb_reachable(), dom_walker::propagate_unreachable_to_edges(), and dom_walker::walk().

m_user_bb_to_rpo

bool dom_walker::m_user_bb_to_rpo

privateinherited

Referenced by dom_walker::walk(), and dom_walker::~dom_walker().

need_ab_cleanup

bitmap eliminate_dom_walker::need_ab_cleanup

Referenced by eliminate_cleanup(), eliminate_dom_walker(), eliminate_stmt(), and ~eliminate_dom_walker().

need_eh_cleanup

bitmap eliminate_dom_walker::need_eh_cleanup

Referenced by eliminate_cleanup(), eliminate_dom_walker(), eliminate_stmt(), and ~eliminate_dom_walker().

STOP

const edge dom_walker::STOP = (edge)-1

staticinherited

Referenced by rewrite_update_dom_walker::before_dom_children(), and dom_walker::walk().

to_fixup

auto_vec<gimple *> eliminate_dom_walker::to_fixup

Referenced by eliminate_cleanup(), and eliminate_stmt().

to_remove

auto_vec<gimple *> eliminate_dom_walker::to_remove

Referenced by before_dom_children(), eliminate_cleanup(), eliminate_stmt(), and process_bb().

---

The documentation for this class was generated from the following file:

• tree-ssa-sccvn.cc